use mpd::song::Song;
use mpd::{Client, State};
use simple_dmenu::dmenu;
use std::process::Command;
use std::time::Duration;

pub type Result<T> = core::result::Result<T, Error>;
pub type Error = Box<dyn std::error::Error>;

#[derive(Debug)]
/// struct storing the mpd Client related stuff
pub struct Connection {
    pub conn: Client,
    pub songs_filenames: Vec<String>,
    pub state: String,
    pub elapsed: Duration,
    pub total_duration: Duration,
    pub volume: u8,
    pub repeat: bool,
    pub random: bool,
    pub current_song: Song,
    pub stats: mpd::Stats,
}

impl Connection {
    /// Create a new connection
    pub fn new(addrs: &str) -> Result<Self> {
        let mut conn = Client::connect(addrs).unwrap();

        let empty_song = Song {
            file: "No Song playing or in Queue".to_string(),
            ..Default::default()
        };

        let songs_filenames: Vec<String> = conn
            .listall()
            .unwrap()
            .into_iter()
            .map(|x| x.file)
            .collect();

        let status = conn.status().unwrap();
        let (elapsed, total) = status.time.unwrap_or_default();
        let volume: u8 = status.volume as u8;
        let repeat = status.repeat;
        let random = status.random;
        let stats = conn.stats().unwrap_or_default();

        let current_song = conn
            .currentsong()
            .unwrap_or_else(|_| Some(empty_song.clone()))
            .unwrap_or(empty_song);
        Ok(Self {
            conn,
            songs_filenames,
            state: "Stopped".to_string(),
            elapsed,
            total_duration: total,
            volume,
            repeat,
            random,
            current_song,
            stats,
        })
    }

    /// Dmenu prompt for selecting songs
    pub fn play_dmenu(&mut self) -> Result<()> {
        is_installed("dmenu")?;
        let ss: Vec<&str> = self.songs_filenames.iter().map(|x| x.as_str()).collect();
        let op = dmenu!(iter &ss; args "-p", "Choose a song: ", "-l", "30");
        let index = ss.iter().position(|s| s == &op);
        if let Some(i) = index {
            let song = self.get_song_with_only_filename(ss.get(i).unwrap());
            self.push(&song)?;
        }
        Ok(())
    }

    /// Update status
    pub fn update_status(&mut self) {
        let status = self.conn.status().unwrap();
        let empty_song = self.get_song_with_only_filename("No Song playing or in Queue");
        let current_song = self
            .conn
            .currentsong()
            .unwrap_or_else(|_| Some(empty_song.clone()))
            .unwrap_or(empty_song);
        let stats = self.conn.stats().unwrap_or_default();

        // Playback State
        match status.state {
            State::Stop => self.state = "Stopped".to_string(),
            State::Play => self.state = "Playing".to_string(),
            State::Pause => self.state = "Paused".to_string(),
        }

        // Progress
        let (elapsed, total) = status.time.unwrap_or_default();
        self.elapsed = elapsed;
        self.total_duration = total;

        // Volume
        self.volume = status.volume as u8;

        // Repeat mode
        self.repeat = status.repeat;

        // Random mode
        self.random = status.random;

        // Current song
        self.current_song = current_song;

        // Stats
        self.stats = stats;
    }

    /// Get progress ratio of current playing song
    pub fn get_progress_ratio(&self) -> f64 {
        let total = self.total_duration.as_secs_f64();
        if total == 0.0 {
            0.0
        } else {
            let ratio = self.elapsed.as_secs_f64() / self.total_duration.as_secs_f64();
            if ratio > 1.0 || ratio == 0.0 {
                0.0
            } else {
                ratio
            }
        }
    }

    /// push the given song to queue
    pub fn push(&mut self, song: &Song) -> Result<()> {
        if self.conn.queue().unwrap().is_empty() {
            self.conn.push(song).unwrap();
            self.conn.play().unwrap();
        } else {
            self.conn.push(song)?;
            let len: u32 = (self.conn.queue().unwrap().len() - 1).try_into().unwrap();
            self.conn.switch(len)?;
            if self.conn.status()?.state == State::Stop {
                self.conn.play()?;
            }
        }

        Ok(())
    }

    /// Push all songs of a playlist into queue
    pub fn load_playlist(&mut self, playlist: &str) -> Result<()> {
        self.conn.load(playlist, ..)?;
        self.conn.play()?;
        Ok(())
    }

    /// Add given song to playlist
    pub fn add_to_playlist(&mut self, playlist: &str, song: &Song) -> Result<()> {
        self.conn.pl_push(playlist, song)?;
        Ok(())
    }

    /// Given a filename, get instance of Song with only filename
    pub fn get_song_with_only_filename(&self, filename: &str) -> Song {
        Song {
            file: filename.to_string(),
            ..Default::default()
        }
    }

    /// Given a song name from a directory, it returns the full path of the song in the database
    pub fn get_full_path(&self, short_path: &str) -> Option<String> {
        for (i, f) in self.songs_filenames.iter().enumerate() {
            if f.contains(short_path) {
                return Some(self.songs_filenames.get(i).unwrap().to_string());
            }
        }
        None
    }

    /// Gives title of current playing song
    pub fn now_playing(&mut self) -> Result<Option<String>> {
        if let Some(s) = &self.current_song.title {
            if let Some(a) = &self.current_song.artist {
                Ok(Some(format!("\"{}\" By {}", s, a)))
            } else {
                Ok(Some(s.to_string()))
            }
        } else {
            Ok(Some(self.current_song.file.clone()))
        }
    }

    // Playback controls
    /// Pause playback
    pub fn pause(&mut self) {
        self.conn.pause(true).unwrap();
    }

    /// Toggles playback
    pub fn toggle_pause(&mut self) {
        self.conn.toggle_pause().unwrap();
    }

    /// Toggle Repeat mode
    pub fn toggle_repeat(&mut self) {
        if self.conn.status().unwrap().repeat {
            self.conn.repeat(false).unwrap();
        } else {
            self.conn.repeat(true).unwrap();
        }
    }

    /// Toggle random mode
    pub fn toggle_random(&mut self) {
        if self.conn.status().unwrap().random {
            self.conn.random(false).unwrap();
        } else {
            self.conn.random(true).unwrap();
        }
    }

    // Volume controls
    /// Increase Volume
    pub fn inc_volume(&mut self, v: i8) {
        let cur = self.conn.status().unwrap().volume;
        if cur + v <= 100 {
            self.conn.volume(cur + v).unwrap();
        }
    }

    /// Decrease volume
    pub fn dec_volume(&mut self, v: i8) {
        let cur = self.conn.status().unwrap().volume;
        if cur - v >= 0 {
            self.conn.volume(cur - v).unwrap();
        }
    }
}

/// Checks if given program is installed in your system
fn is_installed(ss: &str) -> Result<()> {
    let output = Command::new("which")
        .arg(ss)
        .output()
        .expect("Failed to execute command");
    if output.status.success() {
        Ok(())
    } else {
        let err = format!("{} not installed", ss);
        Err(err.into())
    }
}