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#[derive(Clone, Debug, Default, PartialEq, Eq)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct Dir {
    pub prefix: DirPrefix,
    pub salt: String,
    pub path: String,
}

#[derive(Clone, Debug, Default, PartialEq, Eq)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct CacheDir {
    pub prefix: DirPrefix,
    pub path: String,
}

#[derive(Clone, Debug, Default, PartialEq, Eq)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct Include {
    pub prefix: DirPrefix,
    pub ignore_missing: bool,
    pub path: String,
}

/// This element contains a directory name where will be mapped as the path 'as-path' in cached information. This is useful if the directory name is an alias (via a bind mount or symlink) to another directory in the system for which cached font information is likely to exist.

/// 'salt' property affects to determine cache filename as same as [`Dir`] element.
#[derive(Clone, Debug, Default, PartialEq, Eq)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct RemapDir {
    pub prefix: DirPrefix,
    pub as_path: String,
    pub salt: String,
    pub path: String,
}

#[derive(Clone, Copy, Debug, PartialEq, Eq)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub enum DirPrefix {
    Default,
    Cwd,
    Xdg,
    Relative,
}

parse_enum! {
    DirPrefix,
    (Default, "default"),
    (Cwd, "cwd"),
    (Xdg, "xdg"),
    (Relative, "relative"),
}

impl Default for DirPrefix {
    fn default() -> Self {
        DirPrefix::Default
    }
}

/// Get the location to user home directory.
///
/// This implementation follows `FcConfigHome` function of freedesktop.org's
/// Fontconfig library.
#[allow(unused_mut, clippy::let_and_return)]
fn config_home() -> Result<String, std::env::VarError> {
    let mut home = std::env::var("HOME");

    #[cfg(target_os = "windows")]
    {
        home = home.or_else(|_| std::env::var("USERPROFILE"));
    }

    home
}

macro_rules! define_calculate_path {
    ($ty:ident, $xdg_env:expr, $xdg_fallback:expr) => {
        impl $ty {
            /// Environment variable name which used `xdg` prefix
            pub const XDG_ENV: &'static str = $xdg_env;
            /// Fallback path when `XDG_ENV` is not exists
            pub const XDG_FALLBACK_PATH: &'static str = $xdg_fallback;

            /// Calculate actual path
            pub fn calculate_path<P: AsRef<std::path::Path> + ?Sized>(
                &self,
                config_file_path: &P,
            ) -> std::path::PathBuf {
                let path = match self.prefix {
                    DirPrefix::Default => self.path.as_str().into(),
                    DirPrefix::Cwd => std::path::Path::new(".").join(self.path.as_str()),
                    DirPrefix::Relative => match config_file_path.as_ref().parent() {
                        Some(parent) => parent.join(self.path.as_str()),
                        None => std::path::Path::new(".").join(self.path.as_str()),
                    },
                    DirPrefix::Xdg => std::path::PathBuf::from(
                        std::env::var($xdg_env).unwrap_or_else(|_| $xdg_fallback.into()),
                    )
                    .join(self.path.as_str()),
                };

                if let Ok(stripped_path) = path.strip_prefix("~") {
                    let home = config_home().unwrap_or("/".to_string());
                    std::path::Path::new(&home).join(stripped_path)
                } else {
                    path
                }
            }
        }
    };
}

define_calculate_path!(Dir, "XDG_DATA_HOME", "~/.local/share");
define_calculate_path!(CacheDir, "XDG_CACHE_HOME", "~/.cache");
define_calculate_path!(Include, "XDG_CONFIG_HOME", "~/.config");
define_calculate_path!(RemapDir, "XDG_CONFIG_HOME", "~/.config");