use std::{borrow::BorrowMut, str::FromStr};

use serde::{Deserialize, Serialize};
use strum::IntoEnumIterator;

use super::{
    parser::{ArgParser, FromCommandArgs, ParseError},
    window::Window,
    Monitor, TagSelect, ToCommandString,
};

#[derive(Debug, Clone, Serialize, Deserialize, strum::Display, strum::EnumIter, PartialEq)]
#[strum(serialize_all = "snake_case")]
pub enum Hook {
    /// The attribute `path` was changed from `old` to `new`.
    /// Requires that the attribute `path` has been passed to the [HlwmCommand::Watch] command before.
    AttributeChanged {
        path: String,
        old: String,
        new: String,
    },
    /// The fullscreen state of `window` was changed to [on|off].
    Fullscreen {
        on: bool,
        window: Window,
    },
    /// The `tag` was selected on `monitor`.
    TagChanged {
        tag: String,
        monitor: Monitor,
    },
    /// The `window` with title `title` was focused
    FocusChanged {
        window: Window,
        title: String,
    },
    WindowTitleChanged {
        window: Window,
        title: String,
    },
    /// The flags (i.e. urgent or filled state) have been changed.
    TagFlags,
    TagAdded(TagSelect),
    TagRenamed {
        old: String,
        new: String,
    },
    Urgent {
        on: bool,
        window: Window,
    },
    /// A `window` appeared which triggered a rule/hook.
    Rule {
        hook: String,
        window: Window,
    },
    /// Tells a panel to quit. The default panel.sh quits on this hook. Many scripts are using this hook.
    QuitPanel,
    /// Tells all daemons that the autostart file is reloaded — and tells them to quit.
    /// This hook **should** be emitted in the first line of every autostart file.
    Reload,
}

impl FromCommandArgs for Hook {
    fn from_command_args<S: Into<String>, I: IntoIterator<Item = S>>(
        cmd: &str,
        args: I,
    ) -> Result<Self, super::parser::ParseError> {
        let mut command = Self::iter()
            .find(|c: &Hook| c.to_string() == cmd)
            .ok_or(ParseError::InvalidCommand(cmd.to_string()))?;

        let x = args.into_iter().map(|i| i.into()).collect::<Vec<String>>();
        let mut parser = ArgParser::from_strings(x.into_iter());

        match command.borrow_mut() {
            Hook::QuitPanel | Hook::Reload | Hook::TagFlags => (),
            Hook::AttributeChanged { path, old, new } => {
                *path = parser.must_string("attribute_changed(path)")?;
                *old = parser.must_string("attribute_changed(old)")?;
                *new = parser.must_string("attribute_changed(new)")?;
            }
            Hook::Fullscreen { on, window } => {
                *on = parser.next_from_str("fullscreen(on)")?;
                *window = parser.next_from_str("fullscreen(window)")?;
            }
            Hook::TagChanged { tag, monitor } => {
                *tag = parser.must_string("tag_changed(tag)")?;
                *monitor = parser.next_from_str("tag_changed(monitor)")?;
            }
            Hook::FocusChanged { window, title } | Hook::WindowTitleChanged { window, title } => {
                *window = parser.next_from_str(&format!("{cmd}(window)"))?;
                *title = parser.must_string(&format!("{cmd}(title)"))?;
            }
            Hook::TagAdded(tag) => {
                *tag = TagSelect::from_str(&parser.must_string(cmd)?).expect("infallible")
            }
            Hook::TagRenamed { old, new } => {
                *old = parser.must_string("tag_renamed(old)")?;
                *new = parser.must_string("tag_renamed(new)")?;
            }
            Hook::Urgent { on, window } => {
                *on = parser.next_from_str("urgent(on)")?;
                *window = parser.next_from_str("urgent(window)")?;
            }
            Hook::Rule { hook, window } => {
                *hook = parser.must_string("rule(hook)")?;
                *window = parser.next_from_str("rule(window)")?;
            }
        }

        Ok(command)
    }
}

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

impl ToCommandString for Hook {
    fn to_command_string(&self) -> String {
        [self.to_string()]
            .into_iter()
            .chain(match self {
                Hook::AttributeChanged { path, old, new } => {
                    vec![path.to_string(), old.to_string(), new.to_string()].into_iter()
                }
                Hook::Fullscreen { on, window } => {
                    vec![on.to_string(), window.to_string()].into_iter()
                }
                Hook::TagChanged { tag, monitor } => {
                    vec![tag.to_string(), monitor.to_string()].into_iter()
                }
                Hook::WindowTitleChanged { window, title }
                | Hook::FocusChanged { window, title } => {
                    vec![window.to_string(), title.to_string()].into_iter()
                }
                Hook::QuitPanel | Hook::Reload | Hook::TagFlags => vec![].into_iter(),
                Hook::TagAdded(tag) => vec![tag.to_string()].into_iter(),
                Hook::TagRenamed { old, new } => vec![old.to_string(), new.to_string()].into_iter(),
                Hook::Urgent { on, window } => vec![on.to_string(), window.to_string()].into_iter(),
                Hook::Rule { hook, window } => {
                    vec![hook.to_string(), window.to_string()].into_iter()
                }
            })
            .collect::<Vec<_>>()
            .join("\t")
    }
}