use self::parse::*;
pub use self::types::*;
use crate::path_utils::fix_unc_path;
use crate::{args::ConfigArgs, cargo::supports_llvm_coverage};
use cargo_metadata::{Metadata, MetadataCommand};
#[cfg(feature = "coveralls")]
use coveralls_api::CiService;
use glob::Pattern;
use humantime_serde::deserialize as humantime_serde;
use indexmap::IndexMap;
use serde::{Deserialize, Serialize};
use std::cell::{Ref, RefCell};
use std::collections::HashSet;
use std::env;
use std::fs;
use std::io::{Error, ErrorKind};
use std::path::{Path, PathBuf};
use std::time::Duration;
use tracing::{error, info, warn};

mod parse;
pub mod types;

#[derive(Debug)]
pub struct ConfigWrapper(pub Vec<Config>);

/// Specifies the current configuration tarpaulin is using.
#[derive(Debug, Clone, Deserialize, Serialize)]
#[serde(default)]
pub struct Config {
    pub name: String,
    /// Path to the projects cargo manifest
    #[serde(rename = "manifest-path")]
    manifest: PathBuf,
    /// Path to a tarpaulin.toml config file
    pub config: Option<PathBuf>,
    /// Path to the projects cargo manifest
    root: Option<PathBuf>,
    /// Flag to also run tests with the ignored attribute
    #[serde(rename = "ignored")]
    pub run_ignored: bool,
    /// Ignore panic macros in code.
    #[serde(rename = "ignore-panics")]
    pub ignore_panics: bool,
    /// Flag to add a clean step when preparing the target project
    #[serde(rename = "force-clean")]
    force_clean: bool,
    /// The opposite of --force-clean
    #[serde(rename = "skip-clean")]
    skip_clean: bool,
    /// Verbose flag for printing information to the user
    pub verbose: bool,
    /// Debug flag for printing internal debugging information to the user
    pub debug: bool,
    /// Enable the event logger
    #[serde(rename = "dump-traces")]
    pub dump_traces: bool,
    /// Flag to count hits in coverage
    pub count: bool,
    /// Flag specifying to run line coverage (default)
    #[serde(rename = "line")]
    pub line_coverage: bool,
    /// Flag specifying to run branch coverage
    #[serde(rename = "branch")]
    pub branch_coverage: bool,
    /// Directory to write output files
    #[serde(rename = "output-dir")]
    pub output_directory: Option<PathBuf>,
    /// Key relating to coveralls service or repo
    pub coveralls: Option<String>,
    /// Enum representing CI tool used.
    #[serde(rename = "ciserver", deserialize_with = "deserialize_ci_server")]
    #[cfg(feature = "coveralls")]
    pub ci_tool: Option<CiService>,
    /// Only valid if coveralls option is set. If coveralls option is set,
    /// as well as report_uri, then the report will be sent to this endpoint
    /// instead.
    #[serde(rename = "report-uri")]
    pub report_uri: Option<String>,
    /// Forward unexpected signals back to the tracee. Used for tests which
    /// rely on signals to work.
    #[serde(rename = "forward")]
    pub forward_signals: bool,
    /// Doesn't link projects with `-Clink-dead-code`
    #[serde(rename = "no-dead-code")]
    pub no_dead_code: bool,
    /// Include all available features in target build
    #[serde(rename = "all-features")]
    pub all_features: bool,
    /// Do not include default features in target build
    #[serde(rename = "no-default-features")]
    pub no_default_features: bool,
    /// Build all packages in the workspace
    #[serde(alias = "workspace")]
    pub all: bool,
    /// Duration to wait before a timeout occurs
    #[serde(deserialize_with = "humantime_serde", rename = "timeout")]
    pub test_timeout: Duration,
    /// Build in release mode
    pub release: bool,
    /// Build the tests only don't run coverage
    #[serde(rename = "no-run")]
    pub no_run: bool,
    /// Don't update `Cargo.lock`.
    pub locked: bool,
    /// Don't update `Cargo.lock` or any caches.
    pub frozen: bool,
    /// Build for the target triple.
    pub target: Option<String>,
    /// Directory for generated artifacts
    #[serde(rename = "target-dir")]
    target_dir: Option<PathBuf>,
    /// Run tarpaulin on project without accessing the network
    pub offline: bool,
    /// Cargo subcommand to run. So far only test and build are supported
    pub command: Mode,
    /// Types of tests for tarpaulin to collect coverage on
    #[serde(rename = "run-types")]
    pub run_types: Vec<RunType>,
    /// Packages to include when building the target project
    pub packages: Vec<String>,
    /// Packages to exclude from testing
    pub exclude: Vec<String>,
    /// Files to exclude from testing in their compiled form
    #[serde(skip_deserializing, skip_serializing)]
    excluded_files: RefCell<Vec<glob::Pattern>>,
    /// Files to exclude from testing in uncompiled form (for serde)
    #[serde(rename = "exclude-files")]
    excluded_files_raw: Vec<String>,
    /// Varargs to be forwarded to the test executables.
    #[serde(rename = "args")]
    pub varargs: Vec<String>,
    /// Features to include in the target project build, e.g. "feature1 feature2"
    pub features: Option<String>,
    /// Unstable cargo features to use
    #[serde(rename = "Z")]
    pub unstable_features: Vec<String>,
    /// Output files to generate
    #[serde(rename = "out")]
    pub generate: Vec<OutputFile>,
    /// Names of tests to run corresponding to `cargo --test <NAME>...`
    #[serde(rename = "test")]
    pub test_names: HashSet<String>,
    /// Names of binaries to run corresponding to `cargo --bin <NAME>...`
    #[serde(rename = "bin")]
    pub bin_names: HashSet<String>,
    /// Names of examples to run corresponding to `cargo --example <NAME>...`
    #[serde(rename = "example")]
    pub example_names: HashSet<String>,
    /// Names of benches to run corresponding to `cargo --bench <NAME>...`
    #[serde(rename = "bench")]
    pub bench_names: HashSet<String>,
    /// Whether to carry on or stop when a test failure occurs
    #[serde(rename = "no-fail-fast")]
    pub no_fail_fast: bool,
    /// Run with the given profile
    pub profile: Option<String>,
    /// returns a non-zero code if coverage is below the threshold
    #[serde(rename = "fail-under")]
    pub fail_under: Option<f64>,
    /// Result of cargo_metadata ran on the crate
    #[serde(skip_deserializing, skip_serializing)]
    pub metadata: RefCell<Option<Metadata>>,
    /// Don't pass --cfg=tarpaulin to the 'RUSTFLAG'
    pub avoid_cfg_tarpaulin: bool,
    /// Colouring of logging
    pub color: Color,
    /// Follow traced executables down
    #[serde(rename = "follow-exec")]
    pub follow_exec: bool,
    /// Number of jobs used for building the tests
    pub jobs: Option<usize>,
    /// Allow test to use an implicit test threads
    #[serde(rename = "implicit-test-threads")]
    pub implicit_test_threads: bool,
    /// Engine to use to collect coverage
    engine: RefCell<TraceEngine>,
    /// Specifying per-config rust flags
    pub rustflags: Option<String>,
    /// Flag to include test functions in coverage statistics
    #[serde(rename = "include-tests")]
    include_tests: bool,
    #[serde(rename = "post-test-delay")]
    /// Delay after test to collect instrumentation files (LLVM only)
    pub post_test_delay: Option<Duration>,
    /// Other objects that should be included to get counter values from for instrumentation
    /// coverage
    objects: Vec<PathBuf>,
    /// Joined to target/tarpaulin to store profraws
    profraw_folder: PathBuf,
    /// Option to fail immediately after a single test fails
    pub fail_immediately: bool,
}

fn default_test_timeout() -> Duration {
    Duration::from_secs(60)
}

impl Default for Config {
    fn default() -> Config {
        Config {
            name: String::new(),
            command: Mode::Test,
            run_types: vec![],
            manifest: default_manifest(),
            config: None,
            root: Default::default(),
            run_ignored: false,
            include_tests: false,
            ignore_panics: false,
            force_clean: true,
            skip_clean: false,
            no_dead_code: false,
            verbose: false,
            debug: false,
            follow_exec: false,
            #[cfg(not(test))]
            dump_traces: false,
            #[cfg(test)]
            dump_traces: true,
            count: false,
            line_coverage: true,
            branch_coverage: false,
            generate: vec![],
            output_directory: Default::default(),
            coveralls: None,
            #[cfg(feature = "coveralls")]
            ci_tool: None,
            report_uri: None,
            forward_signals: true,
            no_default_features: false,
            features: None,
            unstable_features: vec![],
            all: false,
            packages: vec![],
            exclude: vec![],
            excluded_files: RefCell::new(vec![]),
            excluded_files_raw: vec![],
            varargs: vec![],
            test_timeout: default_test_timeout(),
            release: false,
            all_features: false,
            no_run: false,
            locked: false,
            frozen: false,
            implicit_test_threads: false,
            target: None,
            target_dir: None,
            offline: false,
            test_names: HashSet::new(),
            example_names: HashSet::new(),
            bin_names: HashSet::new(),
            bench_names: HashSet::new(),
            no_fail_fast: false,
            profile: None,
            fail_under: None,
            metadata: RefCell::new(None),
            avoid_cfg_tarpaulin: false,
            jobs: None,
            color: Color::Auto,
            engine: RefCell::default(),
            rustflags: None,
            post_test_delay: Some(Duration::from_secs(1)),
            objects: vec![],
            profraw_folder: PathBuf::from("profraws"),
            fail_immediately: false,
        }
    }
}

impl From<ConfigArgs> for ConfigWrapper {
    fn from(args: ConfigArgs) -> Self {
        info!("Creating config");

        let features = args.features;
        let features = if features.is_empty() {
            None
        } else {
            Some(features.join(" "))
        };

        let force_clean = match (args.force_clean, args.skip_clean) {
            (true, false) | (false, false) => true,
            (false, true) => false,
            _ => {
                warn!("skip-clean and force-clean are incompatible. Selecting force-clean");
                true
            }
        };

        let args_config = Config {
            name: String::new(),
            manifest: process_manifest(args.manifest_path, args.root.clone()),
            config: None,
            root: args.root,
            engine: RefCell::new(args.engine.unwrap_or_default()),
            command: args.command.unwrap_or(Mode::Test),
            verbose: args.logging.verbose || args.logging.debug,
            debug: args.logging.debug,
            dump_traces: args.logging.debug || args.logging.dump_traces,
            color: args.logging.color.unwrap_or(Color::Auto),
            run_types: args.run_types.collect(),
            run_ignored: args.ignored,
            include_tests: args.include_tests,
            ignore_panics: args.ignore_panics,
            no_dead_code: args.no_dead_code,
            force_clean,
            skip_clean: !force_clean,
            no_fail_fast: args.no_fail_fast,
            follow_exec: args.follow_exec,
            count: args.count,
            line_coverage: args.line || !args.branch,
            branch_coverage: args.branch || !args.line,
            generate: args.out,
            output_directory: args.output_dir,
            coveralls: args.coveralls,
            #[cfg(feature = "coveralls")]
            ci_tool: args.ciserver.map(|c| c.0),
            report_uri: args.report_uri,
            forward_signals: true, // No longer an option
            all_features: args.all_features,
            no_default_features: args.no_default_features,
            features,
            unstable_features: args.unstable_features,
            all: args.all | args.workspace,
            packages: args.packages,
            exclude: args.exclude,
            excluded_files_raw: args.exclude_files.iter().map(Pattern::to_string).collect(),
            excluded_files: RefCell::new(args.exclude_files),
            varargs: args.args,
            test_timeout: Duration::from_secs(args.timeout.unwrap_or(60)),
            release: args.release,
            no_run: args.no_run,
            locked: args.locked,
            frozen: args.frozen,
            target: args.target,
            target_dir: process_target_dir(args.target_dir),
            offline: args.offline,
            test_names: args.test.into_iter().collect(),
            bin_names: args.bin.into_iter().collect(),
            bench_names: args.bench.into_iter().collect(),
            example_names: args.example.into_iter().collect(),
            fail_under: args.fail_under,
            jobs: args.jobs,
            profile: args.profile,
            metadata: RefCell::new(None),
            avoid_cfg_tarpaulin: args.avoid_cfg_tarpaulin,
            implicit_test_threads: args.implicit_test_threads,
            rustflags: args.rustflags,
            post_test_delay: args.post_test_delay.map(Duration::from_secs),
            objects: canonicalize_paths(args.objects),
            profraw_folder: PathBuf::from("profraws"),
            fail_immediately: args.fail_immediately,
        };
        if args.ignore_config {
            Self(vec![args_config])
        } else if let Some(mut path) = args.config {
            if path.is_relative() {
                path = env::current_dir()
                    .unwrap()
                    .join(path)
                    .canonicalize()
                    .unwrap();
            }
            let confs = Config::load_config_file(path);
            Config::get_config_vec(confs, args_config)
        } else if let Some(cfg) = args_config.check_for_configs() {
            let confs = Config::load_config_file(cfg);
            Config::get_config_vec(confs, args_config)
        } else {
            Self(vec![args_config])
        }
    }
}

impl Config {
    /// This returns the engine selected for tarpaulin to run. This function will not return Auto
    /// instead it will resolve to the best-fit `TraceEngine` for the given configuration
    pub fn engine(&self) -> TraceEngine {
        let engine = *self.engine.borrow();
        match engine {
            TraceEngine::Auto | TraceEngine::Llvm if supports_llvm_coverage() => TraceEngine::Llvm,
            engine => {
                if engine == TraceEngine::Llvm {
                    error!("unable to utilise llvm coverage, due to compiler support. Falling back to Ptrace");
                    self.engine.replace(TraceEngine::Ptrace);
                }
                TraceEngine::Ptrace
            }
        }
    }

    pub fn set_engine(&self, engine: TraceEngine) {
        self.engine.replace(engine);
    }

    pub fn set_clean(&mut self, clean: bool) {
        self.force_clean = clean;
        self.skip_clean = !clean;
    }

    pub fn set_include_tests(&mut self, include: bool) {
        self.include_tests = include;
    }

    pub fn include_tests(&self) -> bool {
        self.include_tests
    }

    pub fn force_clean(&self) -> bool {
        // default is force clean true skip clean false. So if one isn't default we pick that one
        // as precedence.
        self.force_clean && !self.skip_clean
    }

    pub fn target_dir(&self) -> PathBuf {
        let res = if let Some(s) = &self.target_dir {
            s.clone()
        } else {
            match *self.get_metadata() {
                Some(ref meta) => PathBuf::from(meta.target_directory.clone()),
                _ => self
                    .manifest
                    .parent()
                    .map(fix_unc_path)
                    .unwrap_or_default()
                    .join("target"),
            }
        };
        fix_unc_path(&res)
    }

    /// Get directory profraws are stored in
    pub fn profraw_dir(&self) -> PathBuf {
        if self.profraw_folder.is_relative() {
            self.target_dir()
                .join("tarpaulin")
                .join(&self.profraw_folder)
        } else {
            self.profraw_folder.clone()
        }
    }

    /// If a relative directory is joined to `$TARGET_DIR/tarpaulin/` otherwise is placed at
    /// absolute directory location
    pub fn set_profraw_folder(&mut self, path: PathBuf) {
        self.profraw_folder = path;
    }

    /// Sets the target dir explicitly
    pub fn set_target_dir(&mut self, target_dir: PathBuf) {
        self.target_dir = Some(target_dir);
    }

    pub fn doctest_dir(&self) -> PathBuf {
        // https://github.com/rust-lang/rust/issues/98690
        let mut result = self.target_dir();
        result.push("doctests");
        result
    }

    pub(crate) fn get_metadata(&self) -> Ref<Option<Metadata>> {
        if self.metadata.borrow().is_none() {
            match MetadataCommand::new().manifest_path(&self.manifest).exec() {
                Ok(meta) => {
                    self.metadata.replace(Some(meta));
                }
                Err(e) => warn!("Couldn't get project metadata {}", e),
            }
        }
        self.metadata.borrow()
    }

    pub fn root(&self) -> PathBuf {
        let res = match *self.get_metadata() {
            Some(ref meta) => PathBuf::from(meta.workspace_root.clone()),
            _ => self
                .manifest
                .parent()
                .map(Path::to_path_buf)
                .unwrap_or_default(),
        };
        fix_unc_path(&res)
    }

    pub fn manifest(&self) -> PathBuf {
        fix_unc_path(&self.manifest)
    }

    pub fn set_manifest(&mut self, manifest: PathBuf) {
        self.manifest = manifest;
    }

    pub fn output_dir(&self) -> PathBuf {
        let path = if let Some(ref path) = self.output_directory {
            if path.is_relative() {
                self.root().join(path)
            } else {
                path.clone()
            }
        } else {
            self.root()
        };
        fix_unc_path(&path)
    }

    pub fn get_config_vec(file_configs: std::io::Result<Vec<Self>>, backup: Self) -> ConfigWrapper {
        if let Ok(mut confs) = file_configs {
            for c in &mut confs {
                c.merge(&backup);
            }
            if confs.is_empty() {
                ConfigWrapper(vec![backup])
            } else {
                ConfigWrapper(confs)
            }
        } else {
            warn!("Failed to deserialize config file falling back to provided args");
            ConfigWrapper(vec![backup])
        }
    }

    /// Taking an existing config look for any relevant config files
    pub fn check_for_configs(&self) -> Option<PathBuf> {
        if let Some(root) = &self.root {
            Self::check_path_for_configs(root)
        } else if let Some(root) = self.manifest.clone().parent() {
            Self::check_path_for_configs(root)
        } else {
            None
        }
    }

    fn check_path_for_configs<P: AsRef<Path>>(path: P) -> Option<PathBuf> {
        let mut path_1 = PathBuf::from(path.as_ref());
        let mut path_2 = path_1.clone();
        path_1.push("tarpaulin.toml");
        path_2.push(".tarpaulin.toml");
        if path_1.exists() {
            Some(path_1)
        } else if path_2.exists() {
            Some(path_2)
        } else {
            None
        }
    }

    pub fn load_config_file<P: AsRef<Path>>(file: P) -> std::io::Result<Vec<Self>> {
        let buffer = fs::read_to_string(file.as_ref())?;
        let mut res = Self::parse_config_toml(&buffer);
        let parent = match file.as_ref().parent() {
            Some(p) => p.to_path_buf(),
            None => PathBuf::new(),
        };
        if let Ok(cfs) = res.as_mut() {
            for c in cfs.iter_mut() {
                c.config = Some(file.as_ref().to_path_buf());
                c.manifest = make_absolute_with_parent(&c.manifest, &parent);
                if let Some(root) = c.root.as_mut() {
                    *root = make_absolute_with_parent(&root, &parent);
                }
                if let Some(root) = c.output_directory.as_mut() {
                    *root = make_absolute_with_parent(&root, &parent);
                }
                if let Some(root) = c.target_dir.as_mut() {
                    *root = make_absolute_with_parent(&root, &parent);
                }
            }
        }
        res
    }

    pub fn parse_config_toml(buffer: &str) -> std::io::Result<Vec<Self>> {
        let mut map: IndexMap<String, Self> = toml::from_str(buffer).map_err(|e| {
            error!("Invalid config file {}", e);
            Error::new(ErrorKind::InvalidData, format!("{e}"))
        })?;

        let mut result = Vec::new();
        for (name, conf) in map.iter_mut() {
            conf.name = name.to_string();
            result.push(conf.clone());
        }
        if result.is_empty() {
            Err(Error::new(ErrorKind::InvalidData, "No config tables"))
        } else {
            Ok(result)
        }
    }

    /// Given a config made from args ignoring the config file take the
    /// relevant settings that should be carried across and move them
    pub fn merge(&mut self, other: &Config) {
        if other.debug {
            self.debug = other.debug;
            self.verbose = other.verbose;
        } else if other.verbose {
            self.verbose = other.verbose;
        }
        self.no_run |= other.no_run;
        self.no_default_features |= other.no_default_features;
        self.ignore_panics |= other.ignore_panics;
        // Since true is the default
        self.forward_signals |= other.forward_signals;
        self.run_ignored |= other.run_ignored;
        self.release |= other.release;
        self.no_dead_code |= other.no_dead_code;
        self.count |= other.count;
        self.all_features |= other.all_features;
        self.implicit_test_threads |= other.implicit_test_threads;
        self.line_coverage |= other.line_coverage;
        self.branch_coverage |= other.branch_coverage;
        self.dump_traces |= other.dump_traces;
        self.offline |= other.offline;
        if self.manifest != other.manifest && self.manifest == default_manifest() {
            self.manifest = other.manifest.clone();
        }
        for obj in &other.objects {
            if !self.objects.contains(obj) {
                self.objects.push(obj.clone());
            }
        }
        self.root = Config::pick_optional_config(&self.root, &other.root);
        self.coveralls = Config::pick_optional_config(&self.coveralls, &other.coveralls);

        cfg_if::cfg_if! {
            if #[cfg(feature = "coveralls")] {
                self.ci_tool = Config::pick_optional_config(&self.ci_tool, &other.ci_tool);
            }
        }

        self.report_uri = Config::pick_optional_config(&self.report_uri, &other.report_uri);
        self.target = Config::pick_optional_config(&self.target, &other.target);
        self.target_dir = Config::pick_optional_config(&self.target_dir, &other.target_dir);
        self.output_directory =
            Config::pick_optional_config(&self.output_directory, &other.output_directory);
        self.all |= other.all;
        self.frozen |= other.frozen;
        self.locked |= other.locked;
        // This is &= because force_clean true is the default. If one is false then that is
        // non-default
        self.force_clean &= other.force_clean;
        self.skip_clean |= other.skip_clean;
        self.include_tests |= other.include_tests;
        self.no_fail_fast |= other.no_fail_fast;

        let end_delay = match (self.post_test_delay, other.post_test_delay) {
            (Some(d), None) | (None, Some(d)) => Some(d),
            (None, None) => None,
            (Some(a), Some(b)) => Some(a.max(b)),
        };
        self.post_test_delay = end_delay;
        // The two flags now don't agree, if one is set to non-default then prioritise that
        match (self.force_clean, self.skip_clean) {
            (true, false) | (false, true) => {}
            (false, _) => {
                self.skip_clean = true;
            }
            (_, true) => {
                self.force_clean = false;
            }
        }

        let new_flags = match (self.rustflags.as_ref(), other.rustflags.as_ref()) {
            (Some(a), Some(b)) => Some(format!("{a} {b}")),
            (Some(a), None) => Some(a.clone()),
            (None, Some(b)) => Some(b.clone()),
            _ => None,
        };
        self.rustflags = new_flags;

        if self.jobs.is_none() {
            self.jobs = other.jobs;
        }
        if self.fail_under.is_none()
            || other.fail_under.is_some() && other.fail_under.unwrap() < self.fail_under.unwrap()
        {
            self.fail_under = other.fail_under;
        }

        if other.test_timeout != default_test_timeout() {
            self.test_timeout = other.test_timeout;
        }

        if self.profile.is_none() && other.profile.is_some() {
            self.profile = other.profile.clone();
        }
        if other.features.is_some() {
            if self.features.is_none() {
                self.features = other.features.clone();
            } else if let Some(features) = self.features.as_mut() {
                features.push(' ');
                features.push_str(other.features.as_ref().unwrap());
            }
        }

        let additional_packages = other
            .packages
            .iter()
            .filter(|package| !self.packages.contains(package))
            .cloned()
            .collect::<Vec<String>>();
        self.packages.extend(additional_packages);

        let additional_outs = other
            .generate
            .iter()
            .filter(|out| !self.generate.contains(out))
            .copied()
            .collect::<Vec<_>>();
        self.generate.extend(additional_outs);

        let additional_excludes = other
            .exclude
            .iter()
            .filter(|package| !self.exclude.contains(package))
            .cloned()
            .collect::<Vec<String>>();
        self.exclude.extend(additional_excludes);

        let additional_varargs = other
            .varargs
            .iter()
            .filter(|package| !self.varargs.contains(package))
            .cloned()
            .collect::<Vec<String>>();
        self.varargs.extend(additional_varargs);

        let additional_z_opts = other
            .unstable_features
            .iter()
            .filter(|package| !self.unstable_features.contains(package))
            .cloned()
            .collect::<Vec<String>>();
        self.unstable_features.extend(additional_z_opts);

        let exclude = &self.exclude;
        self.packages.retain(|package| {
            let keep = !exclude.contains(package);
            if !keep {
                info!("{} is in exclude list removing from packages", package);
            }
            keep
        });

        for test in &other.test_names {
            self.test_names.insert(test.clone());
        }
        for test in &other.bin_names {
            self.bin_names.insert(test.clone());
        }
        for test in &other.example_names {
            self.example_names.insert(test.clone());
        }
        for test in &other.bench_names {
            self.bench_names.insert(test.clone());
        }
        for ty in &other.run_types {
            if !self.run_types.contains(ty) {
                self.run_types.push(*ty);
            }
        }

        if !other.excluded_files_raw.is_empty() {
            self.excluded_files_raw
                .extend_from_slice(&other.excluded_files_raw);

            // Now invalidated the compiled regex cache so clear it
            let mut excluded_files = self.excluded_files.borrow_mut();
            excluded_files.clear();
        }
    }

    pub fn pick_optional_config<T: Clone>(
        base_config: &Option<T>,
        override_config: &Option<T>,
    ) -> Option<T> {
        if override_config.is_some() {
            override_config.clone()
        } else {
            base_config.clone()
        }
    }

    pub fn objects(&self) -> &[PathBuf] {
        &self.objects
    }

    pub fn has_named_tests(&self) -> bool {
        !(self.test_names.is_empty()
            && self.bin_names.is_empty()
            && self.example_names.is_empty()
            && self.bench_names.is_empty())
    }

    #[inline]
    pub fn is_coveralls(&self) -> bool {
        self.coveralls.is_some()
    }

    #[inline]
    pub fn exclude_path(&self, path: &Path) -> bool {
        if self.excluded_files.borrow().len() != self.excluded_files_raw.len() {
            let mut excluded_files = self.excluded_files.borrow_mut();
            let mut compiled = globs_from_excluded(&self.excluded_files_raw);
            excluded_files.clear();
            excluded_files.append(&mut compiled);
        }
        let project = self.strip_base_dir(path);

        self.excluded_files
            .borrow()
            .iter()
            .any(|x| x.matches_path(&project))
    }

    /// returns the relative path from the base_dir
    /// uses root if set, else env::current_dir()
    #[inline]
    pub fn get_base_dir(&self) -> PathBuf {
        let root = self.root();
        let res = if root.is_absolute() {
            root
        } else {
            let base_dir = env::current_dir().unwrap();
            if let Ok(res) = base_dir.join(root).canonicalize() {
                res
            } else {
                base_dir
            }
        };
        fix_unc_path(&res)
    }

    /// returns the relative path from the base_dir
    #[inline]
    pub fn strip_base_dir(&self, path: &Path) -> PathBuf {
        path_relative_from(path, &self.get_base_dir()).unwrap_or_else(|| path.to_path_buf())
    }

    #[inline]
    pub fn is_default_output_dir(&self) -> bool {
        self.output_directory.is_none()
    }
}

fn make_absolute_with_parent(path: impl AsRef<Path>, parent: impl AsRef<Path>) -> PathBuf {
    let path = path.as_ref();
    if path.is_relative() {
        parent.as_ref().join(path)
    } else {
        path.to_path_buf()
    }
}

/// Gets the relative path from one directory to another, if it exists.
/// Credit to brson from this commit from 2015
/// https://github.com/rust-lang/rust/pull/23283/files
///
pub fn path_relative_from(path: &Path, base: &Path) -> Option<PathBuf> {
    use std::path::Component;

    if path.is_absolute() != base.is_absolute() {
        if path.is_absolute() {
            Some(path.to_path_buf())
        } else {
            None
        }
    } else {
        let mut ita = path.components();
        let mut itb = base.components();
        let mut comps = vec![];

        loop {
            match (ita.next(), itb.next()) {
                (None, None) => break,
                (Some(a), None) => {
                    comps.push(a);
                    comps.extend(ita.by_ref());
                    break;
                }
                (None, _) => comps.push(Component::ParentDir),
                (Some(a), Some(b)) if comps.is_empty() && a == b => (),
                (Some(a), Some(Component::CurDir)) => comps.push(a),
                (Some(_), Some(Component::ParentDir)) => return None,
                (Some(a), Some(_)) => {
                    comps.push(Component::ParentDir);
                    for _ in itb {
                        comps.push(Component::ParentDir);
                    }
                    comps.push(a);
                    comps.extend(ita.by_ref());
                    break;
                }
            }
        }
        Some(comps.iter().map(|c| c.as_os_str()).collect())
    }
}

#[cfg(test)]
mod tests {
    use clap::Parser;

    use crate::args::TarpaulinCli;

    use super::*;

    #[test]
    fn is_root_absolute() {
        let args = TarpaulinCli::parse_from(vec!["tarpaulin", "-r", "."]);
        let conf = ConfigWrapper::from(args.config).0;
        assert!(conf[0].root().is_absolute());
    }

    #[test]
    fn features_args() {
        let args = TarpaulinCli::parse_from(vec![
            "tarpaulin",
            "--ignore-config",
            "--features",
            "a",
            "--features",
            "b",
        ]);
        let conf = ConfigWrapper::from(args.config).0;
        assert_eq!(conf.len(), 1);
        assert_eq!(conf[0].features, Some("a b".to_string()));

        let args =
            TarpaulinCli::parse_from(vec!["tarpaulin", "--ignore-config", "--features", "a b"]);
        let conf = ConfigWrapper::from(args.config).0;
        assert_eq!(conf.len(), 1);
        assert_eq!(conf[0].features, Some("a b".to_string()));
    }

    #[test]
    fn exclude_paths() {
        let args = TarpaulinCli::parse_from(vec!["tarpaulin", "--exclude-files", "*module*"]);
        let conf = ConfigWrapper::from(args.config).0;
        assert_eq!(conf.len(), 1);
        assert!(conf[0].exclude_path(Path::new("src/module/file.rs")));
        assert!(!conf[0].exclude_path(Path::new("src/mod.rs")));
        assert!(!conf[0].exclude_path(Path::new("unrelated.rs")));
        assert!(conf[0].exclude_path(Path::new("module.rs")));
    }

    #[test]
    fn exclude_paths_directory_separators() {
        let args = TarpaulinCli::parse_from(vec![
            "tarpaulin",
            "--exclude-files",
            "src/foo/*",
            "src\\bar\\*",
        ]);
        let conf = ConfigWrapper::from(args.config).0;
        assert_eq!(conf.len(), 1);
        assert!(conf[0].exclude_path(Path::new("src/foo/file.rs")));
        assert!(conf[0].exclude_path(Path::new("src\\bar\\file.rs")));

        cfg_if::cfg_if! {
            if #[cfg(windows)] {
                assert!(conf[0].exclude_path(Path::new("src\\foo\\file.rs")));
                assert!(conf[0].exclude_path(Path::new("src/bar/file.rs")));
            } else {
                assert!(!conf[0].exclude_path(Path::new("src\\foo\\file.rs")));
                assert!(!conf[0].exclude_path(Path::new("src/bar/file.rs")));
            }
        }
    }

    #[test]
    fn no_exclusions() {
        let args = TarpaulinCli::parse_from(vec!["tarpaulin"]);
        let conf = ConfigWrapper::from(args.config).0;
        assert_eq!(conf.len(), 1);
        assert!(!conf[0].exclude_path(Path::new("src/module/file.rs")));
        assert!(!conf[0].exclude_path(Path::new("src/mod.rs")));
        assert!(!conf[0].exclude_path(Path::new("unrelated.rs")));
        assert!(!conf[0].exclude_path(Path::new("module.rs")));
    }

    #[test]
    fn exclude_exact_file() {
        let args = TarpaulinCli::parse_from(vec!["tarpaulin", "--exclude-files", "*/lib.rs"]);
        let conf = ConfigWrapper::from(args.config).0;
        assert_eq!(conf.len(), 1);
        assert!(conf[0].exclude_path(Path::new("src/lib.rs")));
        assert!(!conf[0].exclude_path(Path::new("src/mod.rs")));
        assert!(!conf[0].exclude_path(Path::new("src/notlib.rs")));
        assert!(!conf[0].exclude_path(Path::new("lib.rs")));
    }

    #[test]
    fn relative_path_test() {
        cfg_if::cfg_if! {
            if #[cfg(windows)] {
                let root_base = "C:";
            } else {
                let root_base = "";
            }
        }
        let path_a = PathBuf::from(format!("{root_base}/this/should/form/a/rel/path/"));
        let path_b = PathBuf::from(format!("{root_base}/this/should/form/b/rel/path/"));

        let rel_path = path_relative_from(&path_b, &path_a);
        assert!(rel_path.is_some());
        assert_eq!(
            rel_path.unwrap(),
            Path::new("../../../b/rel/path"),
            "Wrong relative path"
        );

        let path_a = PathBuf::from(format!("{root_base}/this/should/not/form/a/rel/path/"));
        let path_b = Path::new("this/should/not/form/a/rel/path/");
        assert!(!path_b.is_absolute());
        assert!(path_a.is_absolute());
        let rel_path = path_relative_from(path_b, &path_a);
        assert_eq!(rel_path, None, "Did not expect relative path");

        let path_a = Path::new("this/should/form/a/rel/path/");
        let path_b = Path::new("this/should/form/b/rel/path/");

        let rel_path = path_relative_from(path_b, path_a);
        assert!(rel_path.is_some());
        assert_eq!(
            rel_path.unwrap(),
            Path::new("../../../b/rel/path"),
            "Wrong relative path"
        );
    }

    #[test]
    fn config_toml() {
        let toml = "[global]
        ignored= true
        coveralls= \"hello\"

        [other]
        run-types = [\"Doctests\", \"Tests\"]";

        let configs = Config::parse_config_toml(toml).unwrap();
        assert_eq!(configs.len(), 2);
        for c in &configs {
            if c.name == "global" {
                assert!(c.run_ignored);
                assert_eq!(c.coveralls, Some("hello".to_string()));
            } else if c.name == "other" {
                assert_eq!(c.run_types, vec![RunType::Doctests, RunType::Tests]);
            } else {
                panic!("Unexpected name {}", c.name);
            }
        }
    }

    #[test]
    fn excluded_merge() {
        let toml = r#"[a]
        exclude-files = ["target/*"]
        [b]
        exclude-files = ["foo.rs"]
        "#;

        let mut configs = Config::parse_config_toml(toml).unwrap();
        let mut config = configs.remove(0);
        config.merge(&configs[0]);
        assert!(config.excluded_files_raw.contains(&"target/*".to_string()));
        assert!(config.excluded_files_raw.contains(&"foo.rs".to_string()));

        assert_eq!(config.excluded_files_raw.len(), 2);
        assert_eq!(configs[0].excluded_files_raw.len(), 1);
    }

    #[test]
    fn target_merge() {
        let toml_a = r#""#;
        let toml_b = r#"target = "wasm32-unknown-unknown""#;
        let toml_c = r#"target = "x86_64-linux-gnu""#;

        let mut a: Config = toml::from_str(toml_a).unwrap();
        let mut b: Config = toml::from_str(toml_b).unwrap();
        let c: Config = toml::from_str(toml_c).unwrap();

        assert_eq!(a.target, None);
        assert_eq!(b.target, Some(String::from("wasm32-unknown-unknown")));
        assert_eq!(c.target, Some(String::from("x86_64-linux-gnu")));

        b.merge(&c);
        assert_eq!(b.target, Some(String::from("x86_64-linux-gnu")));

        a.merge(&b);
        assert_eq!(a.target, Some(String::from("x86_64-linux-gnu")));
    }

    #[test]
    fn workspace_merge() {
        let toml_a = r#"workspace = false"#;
        let toml_b = r#"workspace = true"#;

        let mut a: Config = toml::from_str(toml_a).unwrap();
        let b: Config = toml::from_str(toml_b).unwrap();

        assert!(!a.all);
        assert!(b.all);

        a.merge(&b);
        assert!(a.all);
    }

    #[test]
    fn packages_merge() {
        let toml_a = r#"packages = []"#;
        let toml_b = r#"packages = ["a"]"#;
        let toml_c = r#"packages = ["b", "a"]"#;

        let mut a: Config = toml::from_str(toml_a).unwrap();
        let mut b: Config = toml::from_str(toml_b).unwrap();
        let c: Config = toml::from_str(toml_c).unwrap();

        assert_eq!(a.packages, Vec::<String>::new());
        assert_eq!(b.packages, vec![String::from("a")]);
        assert_eq!(c.packages, vec![String::from("b"), String::from("a")]);

        a.merge(&c);
        assert_eq!(a.packages, vec![String::from("b"), String::from("a")]);

        b.merge(&c);
        assert_eq!(b.packages, vec![String::from("a"), String::from("b")]);
    }

    #[test]
    fn exclude_packages_merge() {
        let toml_a = r#"packages = []
                        exclude = ["a"]"#;
        let toml_b = r#"packages = ["a"]
                        exclude = ["b"]"#;
        let toml_c = r#"packages = ["b", "a"]
                        exclude = ["c"]"#;

        let mut a: Config = toml::from_str(toml_a).unwrap();
        let mut b: Config = toml::from_str(toml_b).unwrap();
        let c: Config = toml::from_str(toml_c).unwrap();

        assert_eq!(a.exclude, vec![String::from("a")]);
        assert_eq!(b.exclude, vec![String::from("b")]);
        assert_eq!(c.exclude, vec![String::from("c")]);

        a.merge(&c);
        assert_eq!(a.packages, vec![String::from("b")]);
        assert_eq!(a.exclude, vec![String::from("a"), String::from("c")]);

        b.merge(&c);
        assert_eq!(b.packages, vec![String::from("a")]);
        assert_eq!(b.exclude, vec![String::from("b"), String::from("c")]);
    }

    #[cfg(feature = "coveralls")]
    #[test]
    fn coveralls_merge() {
        let toml = r#"[a]
        coveralls = "abcd"
        report-uri = "https://example.com/report"

        [b]
        coveralls = "xyz"
        ciserver = "coveralls-ruby"
        "#;

        let configs = Config::parse_config_toml(toml).unwrap();
        let mut a_config = configs.iter().find(|x| x.name == "a").unwrap().clone();
        let b_config = configs.iter().find(|x| x.name == "b").unwrap();
        a_config.merge(b_config);
        assert_eq!(a_config.coveralls, Some("xyz".to_string()));
        assert_eq!(
            a_config.ci_tool,
            Some(CiService::Other("coveralls-ruby".to_string()))
        );
        assert_eq!(
            a_config.report_uri,
            Some("https://example.com/report".to_string())
        );
    }

    #[test]
    fn output_dir_merge() {
        cfg_if::cfg_if! {
            if #[cfg(windows)] {
                let toml = r#"[has_dir]
                output-dir = "C:/foo"

                [no_dir]
                coveralls = "xyz"

                [other_dir]
                output-dir = "C:/bar"
                "#;
                let foo_dir = PathBuf::from("C:/foo");
                let bar_dir = PathBuf::from("C:/bar");
            } else {
                let toml = r#"[has_dir]
                output-dir = "/foo"

                [no_dir]
                coveralls = "xyz"

                [other_dir]
                output-dir = "/bar"
                "#;
                let foo_dir = PathBuf::from("/foo");
                let bar_dir = PathBuf::from("/bar");
            }
        }

        let configs = Config::parse_config_toml(toml).unwrap();
        let has_dir = configs
            .iter()
            .find(|x| x.name == "has_dir")
            .unwrap()
            .clone();
        let no_dir = configs.iter().find(|x| x.name == "no_dir").unwrap().clone();
        let other_dir = configs
            .iter()
            .find(|x| x.name == "other_dir")
            .unwrap()
            .clone();

        let mut merged_into_has_dir = has_dir.clone();
        merged_into_has_dir.merge(&no_dir);
        assert_eq!(merged_into_has_dir.output_dir(), foo_dir);

        let mut merged_into_no_dir = no_dir.clone();
        merged_into_no_dir.merge(&has_dir);
        assert_eq!(merged_into_no_dir.output_dir(), foo_dir);

        let mut neither_merged_dir = no_dir.clone();
        neither_merged_dir.merge(&no_dir);
        assert_eq!(neither_merged_dir.output_dir(), env::current_dir().unwrap());

        let mut both_merged_dir = has_dir;
        both_merged_dir.merge(&other_dir);
        assert_eq!(both_merged_dir.output_dir(), bar_dir);
    }

    #[test]
    fn rustflags_merge() {
        let toml = r#"
        [flag1]
        rustflags = "xyz"

        [flag2]
        rustflags = "bar"
        "#;

        let configs = Config::parse_config_toml(toml).unwrap();
        let flag1 = configs.iter().find(|x| x.name == "flag1").unwrap().clone();
        let flag2 = configs.iter().find(|x| x.name == "flag2").unwrap().clone();
        let noflags = Config::default();

        let mut yes_no = flag1.clone();
        yes_no.merge(&noflags);
        assert_eq!(yes_no.rustflags, Some("xyz".to_string()));

        let mut no_yes = noflags.clone();
        no_yes.merge(&flag2);
        assert_eq!(no_yes.rustflags, Some("bar".to_string()));

        let mut f1_2 = flag1;
        f1_2.merge(&flag2);
        let flags = f1_2.rustflags.unwrap();
        let split = flags.split_ascii_whitespace().collect::<Vec<_>>();
        assert_eq!(split.len(), 2);
        assert!(split.contains(&"xyz"));
        assert!(split.contains(&"bar"));
    }

    #[test]
    fn all_toml_options() {
        let toml = r#"[all]
        debug = true
        verbose = true
        ignore-panics = true
        count = true
        ignored = true
        force-clean = true
        branch = true
        forward = true
        coveralls = "hello"
        report-uri = "http://hello.com"
        no-default-features = true
        features = "a b"
        all-features = true
        workspace = true
        packages = ["pack_1"]
        exclude = ["pack_2"]
        exclude-files = ["fuzz/*"]
        timeout = "5s"
        release = true
        no-run = true
        locked = true
        frozen = true
        target = "wasm32-unknown-unknown"
        target-dir = "/tmp"
        offline = true
        Z = ["something-nightly"]
        out = ["Html"]
        run-types = ["Doctests"]
        root = "/home/rust"
        manifest-path = "/home/rust/foo/Cargo.toml"
        ciserver = "travis-ci"
        args = ["--nocapture"]
        test = ["test1", "test2"]
        bin = ["bin"]
        example = ["example"]
        bench = ["bench"]
        no-fail-fast = true
        profile = "Release"
        dump-traces = true
        all-targets = true
        "#;
        let mut configs = Config::parse_config_toml(toml).unwrap();
        assert_eq!(configs.len(), 1);
        let config = configs.remove(0);
        assert!(config.debug);
        assert!(config.verbose);
        assert!(config.dump_traces);
        assert!(config.ignore_panics);
        assert!(config.count);
        assert!(config.run_ignored);
        assert!(config.force_clean);
        assert!(config.branch_coverage);
        assert!(config.forward_signals);
        assert_eq!(config.coveralls, Some("hello".to_string()));
        assert_eq!(config.report_uri, Some("http://hello.com".to_string()));
        assert!(config.no_default_features);
        assert!(config.all_features);
        assert!(config.all);
        assert!(config.release);
        assert!(config.no_run);
        assert!(config.locked);
        assert!(config.frozen);
        assert_eq!(Some(String::from("wasm32-unknown-unknown")), config.target);
        assert_eq!(Some(Path::new("/tmp").to_path_buf()), config.target_dir);
        assert!(config.offline);
        assert_eq!(config.test_timeout, Duration::from_secs(5));
        assert_eq!(config.unstable_features.len(), 1);
        assert_eq!(config.unstable_features[0], "something-nightly");
        assert_eq!(config.varargs.len(), 1);
        assert_eq!(config.varargs[0], "--nocapture");
        assert_eq!(config.features, Some(String::from("a b")));
        assert_eq!(config.excluded_files_raw.len(), 1);
        assert_eq!(config.excluded_files_raw[0], "fuzz/*");
        assert_eq!(config.packages.len(), 1);
        assert_eq!(config.packages[0], "pack_1");
        assert_eq!(config.exclude.len(), 1);
        assert_eq!(config.exclude[0], "pack_2");
        assert_eq!(config.generate.len(), 1);
        assert_eq!(config.generate[0], OutputFile::Html);
        assert_eq!(config.run_types.len(), 1);
        assert_eq!(config.run_types[0], RunType::Doctests);
        assert_eq!(config.ci_tool, Some(CiService::Travis));
        assert_eq!(config.root, Some("/home/rust".into()));
        assert_eq!(config.manifest, PathBuf::from("/home/rust/foo/Cargo.toml"));
        assert_eq!(config.profile, Some("Release".to_string()));
        assert!(config.no_fail_fast);
        assert!(config.test_names.contains("test1"));
        assert!(config.test_names.contains("test2"));
        assert!(config.bin_names.contains("bin"));
        assert!(config.example_names.contains("example"));
        assert!(config.bench_names.contains("bench"));
    }
}