use crossterm::style::Color;
use crossterm::style::{Attribute, ContentStyle, StyledContent, Stylize};
use lscolors::{Indicator, LsColors};
use std::path::Path;

pub use crate::flags::color::ThemeOption;
use crate::git::GitStatus;
use crate::print_output;
use crate::theme::{color::ColorTheme, Theme};

#[allow(dead_code)]
#[derive(Hash, Debug, Eq, PartialEq, Clone)]
pub enum Elem {
    /// Node type
    File {
        exec: bool,
        uid: bool,
    },
    SymLink,
    BrokenSymLink,
    MissingSymLinkTarget,
    Dir {
        uid: bool,
    },
    Pipe,
    BlockDevice,
    CharDevice,
    Socket,
    Special,

    /// Permission
    Read,
    Write,
    Exec,
    ExecSticky,
    NoAccess,
    Octal,
    Acl,
    Context,

    /// Attributes
    Archive,
    AttributeRead,
    Hidden,
    System,

    /// Last Time Modified
    DayOld,
    HourOld,
    Older,

    /// User / Group Name
    User,
    Group,

    /// File Size
    NonFile,
    FileLarge,
    FileMedium,
    FileSmall,

    /// INode
    INode {
        valid: bool,
    },

    Links {
        valid: bool,
    },

    TreeEdge,

    GitStatus {
        status: GitStatus,
    },
}

impl Elem {
    fn has_suid(&self) -> bool {
        matches!(self, Elem::Dir { uid: true } | Elem::File { uid: true, .. })
    }

    pub fn get_color(&self, theme: &ColorTheme) -> Color {
        match self {
            Elem::File {
                exec: true,
                uid: true,
            } => theme.file_type.file.exec_uid,
            Elem::File {
                exec: false,
                uid: true,
            } => theme.file_type.file.uid_no_exec,
            Elem::File {
                exec: true,
                uid: false,
            } => theme.file_type.file.exec_no_uid,
            Elem::File {
                exec: false,
                uid: false,
            } => theme.file_type.file.no_exec_no_uid,
            Elem::SymLink => theme.file_type.symlink.default,
            Elem::BrokenSymLink => theme.file_type.symlink.broken,
            Elem::MissingSymLinkTarget => theme.file_type.symlink.missing_target,
            Elem::Dir { uid: true } => theme.file_type.dir.uid,
            Elem::Dir { uid: false } => theme.file_type.dir.no_uid,
            Elem::Pipe => theme.file_type.pipe,
            Elem::BlockDevice => theme.file_type.block_device,
            Elem::CharDevice => theme.file_type.char_device,
            Elem::Socket => theme.file_type.socket,
            Elem::Special => theme.file_type.special,

            Elem::Read => theme.permission.read,
            Elem::Write => theme.permission.write,
            Elem::Exec => theme.permission.exec,
            Elem::ExecSticky => theme.permission.exec_sticky,
            Elem::NoAccess => theme.permission.no_access,
            Elem::Octal => theme.permission.octal,
            Elem::Acl => theme.permission.acl,
            Elem::Context => theme.permission.context,

            Elem::Archive => theme.attributes.archive,
            Elem::AttributeRead => theme.attributes.read,
            Elem::Hidden => theme.attributes.hidden,
            Elem::System => theme.attributes.system,

            Elem::DayOld => theme.date.day_old,
            Elem::HourOld => theme.date.hour_old,
            Elem::Older => theme.date.older,

            Elem::User => theme.user,
            Elem::Group => theme.group,
            Elem::NonFile => theme.size.none,
            Elem::FileLarge => theme.size.large,
            Elem::FileMedium => theme.size.medium,
            Elem::FileSmall => theme.size.small,
            Elem::INode { valid: true } => theme.inode.valid,
            Elem::INode { valid: false } => theme.inode.invalid,
            Elem::TreeEdge => theme.tree_edge,
            Elem::Links { valid: false } => theme.links.invalid,
            Elem::Links { valid: true } => theme.links.valid,

            Elem::GitStatus {
                status: GitStatus::Default,
            } => theme.git_status.default,
            Elem::GitStatus {
                status: GitStatus::Unmodified,
            } => theme.git_status.unmodified,
            Elem::GitStatus {
                status: GitStatus::Ignored,
            } => theme.git_status.ignored,
            Elem::GitStatus {
                status: GitStatus::NewInIndex,
            } => theme.git_status.new_in_index,
            Elem::GitStatus {
                status: GitStatus::NewInWorkdir,
            } => theme.git_status.new_in_workdir,
            Elem::GitStatus {
                status: GitStatus::Typechange,
            } => theme.git_status.typechange,
            Elem::GitStatus {
                status: GitStatus::Deleted,
            } => theme.git_status.deleted,
            Elem::GitStatus {
                status: GitStatus::Renamed,
            } => theme.git_status.renamed,
            Elem::GitStatus {
                status: GitStatus::Modified,
            } => theme.git_status.modified,
            Elem::GitStatus {
                status: GitStatus::Conflicted,
            } => theme.git_status.conflicted,
        }
    }
}

pub type ColoredString = StyledContent<String>;

pub struct Colors {
    theme: Option<ColorTheme>,
    lscolors: Option<LsColors>,
}

impl Colors {
    pub fn new(t: ThemeOption) -> Self {
        let theme = match t {
            ThemeOption::NoColor => None,
            ThemeOption::Default | ThemeOption::NoLscolors => Some(Theme::default().color),
            ThemeOption::Custom => Some(
                Theme::from_path::<ColorTheme>(Path::new("colors").to_str().unwrap())
                    .unwrap_or_default(),
            ),
            ThemeOption::CustomLegacy(ref file) => {
                print_output!(
                    "Warning: the 'themes' directory is deprecated, use 'colors.yaml' instead.\n\n"
                );
                // TODO: drop the `themes` dir prefix, adding it here only for backwards compatibility
                Some(
                    Theme::from_path::<ColorTheme>(
                        Path::new("themes").join(file).to_str().unwrap_or(file),
                    )
                    .unwrap_or_default(),
                )
            }
        };
        let lscolors = match t {
            ThemeOption::Default | ThemeOption::Custom | ThemeOption::CustomLegacy(_) => {
                Some(LsColors::from_env().unwrap_or_default())
            }
            _ => None,
        };

        Self { theme, lscolors }
    }

    pub fn colorize<S: Into<String>>(&self, input: S, elem: &Elem) -> ColoredString {
        self.style(elem).apply(input.into())
    }

    pub fn colorize_using_path(&self, input: String, path: &Path, elem: &Elem) -> ColoredString {
        let style_from_path = self.style_from_path(path);
        match style_from_path {
            Some(style_from_path) => style_from_path.apply(input),
            None => self.colorize(input, elem),
        }
    }

    pub fn default_style() -> ContentStyle {
        ContentStyle::default()
    }

    fn style_from_path(&self, path: &Path) -> Option<ContentStyle> {
        match &self.lscolors {
            Some(lscolors) => lscolors.style_for_path(path).map(to_content_style),
            None => None,
        }
    }

    fn style(&self, elem: &Elem) -> ContentStyle {
        match &self.lscolors {
            Some(lscolors) => match self.get_indicator_from_elem(elem) {
                Some(style) => {
                    let style = lscolors.style_for_indicator(style);
                    style.map(to_content_style).unwrap_or_default()
                }
                None => self.style_default(elem),
            },
            None => self.style_default(elem),
        }
    }

    fn style_default(&self, elem: &Elem) -> ContentStyle {
        if let Some(t) = &self.theme {
            let style_fg = ContentStyle::default().with(elem.get_color(t));
            if elem.has_suid() {
                style_fg.on(Color::AnsiValue(124)) // Red3
            } else {
                style_fg
            }
        } else {
            ContentStyle::default()
        }
    }

    fn get_indicator_from_elem(&self, elem: &Elem) -> Option<Indicator> {
        let indicator_string = match elem {
            Elem::File { exec, uid } => match (exec, uid) {
                (_, true) => None,
                (true, false) => Some("ex"),
                (false, false) => Some("fi"),
            },
            Elem::Dir { uid } => {
                if *uid {
                    None
                } else {
                    Some("di")
                }
            }
            Elem::SymLink => Some("ln"),
            Elem::Pipe => Some("pi"),
            Elem::Socket => Some("so"),
            Elem::BlockDevice => Some("bd"),
            Elem::CharDevice => Some("cd"),
            Elem::BrokenSymLink => Some("or"),
            Elem::MissingSymLinkTarget => Some("mi"),
            _ => None,
        };

        match indicator_string {
            Some(ids) => Indicator::from(ids),
            None => None,
        }
    }
}

fn to_content_style(ls: &lscolors::Style) -> ContentStyle {
    let to_crossterm_color = |c: &lscolors::Color| match c {
        lscolors::style::Color::RGB(r, g, b) => Color::Rgb {
            r: *r,
            g: *g,
            b: *b,
        },
        lscolors::style::Color::Fixed(n) => Color::AnsiValue(*n),
        lscolors::style::Color::Black => Color::Black,
        lscolors::style::Color::Red => Color::DarkRed,
        lscolors::style::Color::Green => Color::DarkGreen,
        lscolors::style::Color::Yellow => Color::DarkYellow,
        lscolors::style::Color::Blue => Color::DarkBlue,
        lscolors::style::Color::Magenta => Color::DarkMagenta,
        lscolors::style::Color::Cyan => Color::DarkCyan,
        lscolors::style::Color::White => Color::Grey,
        lscolors::style::Color::BrightBlack => Color::DarkGrey,
        lscolors::style::Color::BrightRed => Color::Red,
        lscolors::style::Color::BrightGreen => Color::Green,
        lscolors::style::Color::BrightYellow => Color::Yellow,
        lscolors::style::Color::BrightBlue => Color::Blue,
        lscolors::style::Color::BrightMagenta => Color::Magenta,
        lscolors::style::Color::BrightCyan => Color::Cyan,
        lscolors::style::Color::BrightWhite => Color::White,
    };
    let mut style = ContentStyle {
        foreground_color: ls.foreground.as_ref().map(to_crossterm_color),
        background_color: ls.background.as_ref().map(to_crossterm_color),
        ..ContentStyle::default()
    };

    if ls.font_style.bold {
        style.attributes.set(Attribute::Bold);
    }
    if ls.font_style.dimmed {
        style.attributes.set(Attribute::Dim);
    }
    if ls.font_style.italic {
        style.attributes.set(Attribute::Italic);
    }
    if ls.font_style.underline {
        style.attributes.set(Attribute::Underlined);
    }
    if ls.font_style.rapid_blink {
        style.attributes.set(Attribute::RapidBlink);
    }
    if ls.font_style.slow_blink {
        style.attributes.set(Attribute::SlowBlink);
    }
    if ls.font_style.reverse {
        style.attributes.set(Attribute::Reverse);
    }
    if ls.font_style.hidden {
        style.attributes.set(Attribute::Hidden);
    }
    if ls.font_style.strikethrough {
        style.attributes.set(Attribute::CrossedOut);
    }

    style
}

#[cfg(test)]
mod tests {
    use super::Colors;
    use crate::color::ThemeOption;
    use crate::theme::color::ColorTheme;
    #[test]
    fn test_color_new_no_color_theme() {
        assert!(Colors::new(ThemeOption::NoColor).theme.is_none());
    }

    #[test]
    fn test_color_new_custom_theme() {
        assert_eq!(
            Colors::new(ThemeOption::Custom).theme,
            Some(ColorTheme::default_dark()),
        );
    }

    #[test]
    fn test_color_new_custom_no_file_theme() {
        assert_eq!(
            Colors::new(ThemeOption::Custom).theme,
            Some(ColorTheme::default_dark()),
        );
    }

    #[test]
    fn test_color_new_bad_legacy_custom_theme() {
        assert_eq!(
            Colors::new(ThemeOption::CustomLegacy("not-existed".to_string())).theme,
            Some(ColorTheme::default_dark()),
        );
    }
}

#[cfg(test)]
mod elem {
    use super::Elem;
    use crate::theme::{color, color::ColorTheme};
    use crossterm::style::Color;

    #[cfg(test)]
    fn test_theme() -> ColorTheme {
        ColorTheme {
            user: Color::AnsiValue(230),  // Cornsilk1
            group: Color::AnsiValue(187), // LightYellow3
            permission: color::Permission {
                read: Color::Green,
                write: Color::Yellow,
                exec: Color::Red,
                exec_sticky: Color::Magenta,
                no_access: Color::AnsiValue(245), // Grey
                octal: Color::AnsiValue(6),
                acl: Color::DarkCyan,
                context: Color::Cyan,
            },
            attributes: color::Attributes {
                read: Color::Green,
                archive: Color::Yellow,
                hidden: Color::Red,
                system: Color::Magenta,
            },
            file_type: color::FileType {
                file: color::File {
                    exec_uid: Color::AnsiValue(40),        // Green3
                    uid_no_exec: Color::AnsiValue(184),    // Yellow3
                    exec_no_uid: Color::AnsiValue(40),     // Green3
                    no_exec_no_uid: Color::AnsiValue(184), // Yellow3
                },
                dir: color::Dir {
                    uid: Color::AnsiValue(33),    // DodgerBlue1
                    no_uid: Color::AnsiValue(33), // DodgerBlue1
                },
                pipe: Color::AnsiValue(44), // DarkTurquoise
                symlink: color::Symlink {
                    default: Color::AnsiValue(44),         // DarkTurquoise
                    broken: Color::AnsiValue(124),         // Red3
                    missing_target: Color::AnsiValue(124), // Red3
                },
                block_device: Color::AnsiValue(44), // DarkTurquoise
                char_device: Color::AnsiValue(172), // Orange3
                socket: Color::AnsiValue(44),       // DarkTurquoise
                special: Color::AnsiValue(44),      // DarkTurquoise
            },
            date: color::Date {
                hour_old: Color::AnsiValue(40), // Green3
                day_old: Color::AnsiValue(42),  // SpringGreen2
                older: Color::AnsiValue(36),    // DarkCyan
            },
            size: color::Size {
                none: Color::AnsiValue(245),   // Grey
                small: Color::AnsiValue(229),  // Wheat1
                medium: Color::AnsiValue(216), // LightSalmon1
                large: Color::AnsiValue(172),  // Orange3
            },
            inode: color::INode {
                valid: Color::AnsiValue(13),    // Pink
                invalid: Color::AnsiValue(245), // Grey
            },
            links: color::Links {
                valid: Color::AnsiValue(13),    // Pink
                invalid: Color::AnsiValue(245), // Grey
            },
            tree_edge: Color::AnsiValue(245), // Grey
            git_status: Default::default(),
        }
    }

    #[test]
    fn test_default_theme_color() {
        assert_eq!(
            Elem::File {
                exec: true,
                uid: true
            }
            .get_color(&test_theme()),
            Color::AnsiValue(40),
        );
        assert_eq!(
            Elem::File {
                exec: false,
                uid: true
            }
            .get_color(&test_theme()),
            Color::AnsiValue(184),
        );
        assert_eq!(
            Elem::File {
                exec: true,
                uid: false
            }
            .get_color(&test_theme()),
            Color::AnsiValue(40),
        );
        assert_eq!(
            Elem::File {
                exec: false,
                uid: false
            }
            .get_color(&test_theme()),
            Color::AnsiValue(184),
        );
    }
}
