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#![allow(dead_code)]
use crate::config::Config;
use crate::errors::RunError;
use crate::process_handling::RunningProcessHandle;
use crate::source_analysis::LineAnalysis;
use crate::statemachine::*;
use crate::TestHandle;
use std::collections::HashMap;
use std::ffi::OsStr;
use std::fs;
use std::path::PathBuf;
use tracing::info;

pub fn create_state_machine<'a>(
    test: impl Into<TestHandle>,
    traces: &'a mut TraceMap,
    analysis: &'a HashMap<PathBuf, LineAnalysis>,
    config: &'a Config,
    event_log: &'a Option<EventLog>,
) -> (TestState, LlvmInstrumentedData<'a>) {
    let handle = test.into();
    if let TestHandle::Process(process) = handle {
        let llvm = LlvmInstrumentedData {
            process: Some(process),
            event_log,
            config,
            traces,
            analysis,
        };
        (TestState::start_state(), llvm)
    } else {
        error!("The llvm cov statemachine requires a process::Child");
        let invalid = LlvmInstrumentedData {
            process: None,
            config,
            event_log,
            traces,
            analysis,
        };
        (TestState::End(1), invalid)
    }
}

/// Handle to the process for an instrumented binary. This will simply
pub struct LlvmInstrumentedData<'a> {
    /// Parent pid of the test
    process: Option<RunningProcessHandle>,
    /// Program config
    config: &'a Config,
    /// Optional event log to update as the test progresses
    event_log: &'a Option<EventLog>,
    /// Instrumentation points in code with associated coverage data
    traces: &'a mut TraceMap,
    /// Source analysis, needed in case we need to follow any executables
    analysis: &'a HashMap<PathBuf, LineAnalysis>,
}

impl<'a> StateData for LlvmInstrumentedData<'a> {
    fn start(&mut self) -> Result<Option<TestState>, RunError> {
        // Nothing needs to be done at startup as this runs like a normal process
        Ok(Some(TestState::wait_state()))
    }

    fn init(&mut self) -> Result<TestState, RunError> {
        // Nothing needs to be done at init as this runs like a normal process
        unreachable!();
    }

    fn last_wait_attempt(&mut self) -> Result<Option<TestState>, RunError> {
        unreachable!();
    }

    fn wait(&mut self) -> Result<Option<TestState>, RunError> {
        if let Some(parent) = self.process.as_mut() {
            match parent.child.wait() {
                Ok(exit) => {
                    let profraws = fs::read_dir(self.config.root())?
                        .into_iter()
                        .filter_map(Result::ok)
                        .filter(|x| {
                            x.path().is_file()
                                && x.path().extension() == Some(OsStr::new("profraw"))
                                && !parent.existing_profraws.contains(&x.path())
                        })
                        .map(|x| x.path())
                        .collect::<Vec<_>>();

                    info!(
                        "For binary: {}",
                        self.config.strip_base_dir(&parent.path).display()
                    );
                    for prof in &profraws {
                        info!("Generated: {}", self.config.strip_base_dir(prof).display());
                    }
                    self.process = None;
                    let code = exit.code().unwrap_or(1);
                    Ok(Some(TestState::End(code)))
                }
                Err(e) => Err(e.into()),
            }
        } else {
            Err(RunError::TestCoverage("Test was not launched".to_string()))
        }
    }

    fn stop(&mut self) -> Result<TestState, RunError> {
        unreachable!();
    }
}