/*
 * This file is a part of RSPlayer
 * Licensed under the GPL-3.0 License
 * Copyright (C) 2026 Salmonik @ salmonik@tuta.io
 * https://codeberg.org/salmonik/RSPlayer
*/

use crate::config::Config;
use crate::database::Database;
use clap::{Command, CommandFactory, Parser, Subcommand};
use clap_complete::{Shell, generate};
use std::path::PathBuf;

#[derive(Parser)]
#[command(name = "rsp", infer_long_args = true)]
#[command(about = "Rust music player daemon", long_about = None)]
pub struct Cli {
    #[command(subcommand)]
    pub command: Commands,
}

#[derive(Subcommand)]
pub enum Commands {
    /// Start the daemon
    StartDaemon,
    /// Stop the daemon
    StopDaemon,
    /// Restart the daemon (kill existing and start new)
    Restart,
    /// Play a track, album, or artist
    Play {
        /// Add after current track and skip to it
        #[arg(short = 'i', long = "now")]
        now: bool,
        /// Add to queue after current track (don't skip)
        #[arg(short = 'n', long = "next")]
        next: bool,
        /// Queue rest of album after this track (requires a track query)
        #[arg(short = 'a', long = "album")]
        album: bool,
        #[arg(value_name = "QUERY")]
        query: Option<String>,
    },
    /// Pause playback
    Pause,
    /// Resume playback
    Resume,
    /// Toggle play/pause
    Toggle,
    /// Stop playback
    Stop,
    /// Skip to next track
    Next,
    /// Skip to previous track
    Previous,
    /// Set volume (0-100)
    Volume {
        #[arg(value_name = "LEVEL")]
        level: Option<u8>,
    },
    /// Shuffle mode
    Shuffle {
        #[arg(value_name = "MODE")]
        mode: Option<String>,
    },
    /// Queue management
    Queue {
        #[arg(value_name = "POSITION")]
        position: Option<String>,
        #[arg(value_name = "QUERY")]
        query: Option<String>,
    },
    /// Show player status
    Status,
    /// Scan music paths to populate database
    Scan {
        #[arg(long)]
        force: bool,
        #[arg(long, value_name = "PATHS")]
        paths: Option<Vec<PathBuf>>,
    },
    /// Settings management
    Settings {
        #[command(subcommand)]
        command: SettingsCommands,
    },
    #[clap(hide = true)]
    /// Generate shell completions (developer only)
    Completions {
        /// Shell to generate (bash, zsh, fish, elvish, powershell)
        /// If not specified, generates all completion files
        #[arg(value_name = "SHELL")]
        shell: Option<String>,
    },
    #[clap(hide = true)]
    /// Complete artists, albums, or tracks from database
    DbComplete {
        /// Query string (e.g. \"J\", \"Artist/\", \"Artist/Album/\")
        #[arg(value_name = "QUERY")]
        query: String,
    },
    /// display lyrics
    Lyrics,
}

#[derive(Subcommand)]
pub enum SettingsCommands {
    /// Get a setting value
    Get {
        #[arg(value_name = "KEY")]
        key: String,
    },
    /// Set a setting value
    Set {
        #[arg(value_name = "KEY")]
        key: String,
        #[arg(value_name = "VALUE")]
        value: String,
    },
    /// List all settings
    List,
    /// Unset a setting
    Unset {
        #[arg(value_name = "KEY")]
        key: String,
    },
    /// Reload config from disk (re-reads config file, re-validates scrobbling tokens)
    Reload,
}

impl Cli {
    pub fn run(&self) -> Result<(), Box<dyn std::error::Error>> {
        match &self.command {
            Commands::StartDaemon => {
                crate::daemon::start_daemon()?;
            }
            Commands::StopDaemon => {
                crate::daemon::stop_daemon()?;
            }
            Commands::Restart => {
                crate::daemon::restart_daemon()?;
            }
            Commands::Play {
                now,
                next,
                album,
                query,
                ..
            } => {
                if let Some(q) = query {
                    let pos = if *now {
                        "now"
                    } else if *next {
                        "next"
                    } else {
                        "last"
                    };
                    if *album {
                        crate::daemon::send_command(format!("play-album {} {}", pos, q))?;
                    } else {
                        crate::daemon::send_command(format!("play {} {}", pos, q))?;
                    }
                } else {
                    crate::daemon::send_command("play last".to_string())?;
                }
            }
            Commands::Pause => {
                crate::daemon::send_command("pause".to_string())?;
            }
            Commands::Resume => {
                crate::daemon::send_command("resume".to_string())?;
            }
            Commands::Toggle => {
                crate::daemon::send_command("toggle".to_string())?;
            }
            Commands::Stop => {
                crate::daemon::send_command("stop".to_string())?;
            }
            Commands::Next => {
                crate::daemon::send_command("next".to_string())?;
            }
            Commands::Previous => {
                crate::daemon::send_command("previous".to_string())?;
            }
            Commands::Volume { level } => {
                if let Some(l) = level {
                    crate::daemon::send_command(format!("volume {}", l))?;
                } else {
                    crate::daemon::send_command("volume".to_string())?;
                }
            }
            Commands::Shuffle { mode } => {
                if let Some(m) = mode {
                    crate::daemon::send_command(format!("shuffle {}", m))?;
                } else {
                    crate::daemon::send_command("shuffle".to_string())?;
                }
            }
            Commands::Queue { position, query } => match (position, query) {
                (None, None) => {
                    crate::daemon::send_command("queue".to_string())?;
                }
                (pos, Some(q)) => {
                    let pos = pos.as_deref().unwrap_or("last");
                    crate::daemon::send_command(format!("queue {} {}", pos, q))?;
                }
                _ => {}
            },
            Commands::Status => {
                crate::daemon::send_command("status".to_string())?;
            }
            Commands::Scan { force, paths } => {
                let config = Config::load()?;
                let db = Database::open(&config)?;
                if let Some(custom_paths) = paths {
                    db.scan_paths(custom_paths, *force)?;
                } else {
                    db.scan_paths(&config.music_paths, *force)?;
                }
                println!("Scan complete");
            }
            Commands::Settings { command } => {
                let mut config = Config::load()?;
                match command {
                    SettingsCommands::Get { key } => {
                        println!("{}", config.get(key)?);
                    }
                    SettingsCommands::Set { key, value } => {
                        config.set(key, value)?;
                        config.save()?;
                        if key == "listenbrainz_token" {
                            let _ = crate::daemon::send_command("validate".to_string());
                        }
                    }
                    SettingsCommands::List => {
                        config.list();
                    }
                    SettingsCommands::Unset { key } => {
                        config.unset(key)?;
                        config.save()?;
                    }
                    SettingsCommands::Reload => {
                        let _ = crate::daemon::send_command("reload".to_string());
                    }
                }
            }
            Commands::DbComplete { query } => {
                // Unescape shell escapes in the input query
                let query = {
                    let mut unescaped = String::with_capacity(query.len());
                    let mut chars = query.chars();
                    while let Some(c) = chars.next() {
                        if c == '\\' {
                            if let Some(next) = chars.next() {
                                unescaped.push(next);
                            }
                        } else {
                            unescaped.push(c);
                        }
                    }
                    unescaped
                };

                let config = match Config::load() {
                    Ok(c) => c,
                    Err(_) => return Ok(()),
                };
                let db = match Database::open(&config) {
                    Ok(d) => d,
                    Err(_) => return Ok(()),
                };

                let results = db.complete(&query).unwrap_or_default();

                for r in &results {
                    println!("{r}");
                }
            }
            Commands::Completions { shell } => {
                let full = Cli::command();
                let subcommands: Vec<Command> = full
                    .get_subcommands()
                    .filter(|s| s.get_name() != "completions" && s.get_name() != "db-complete")
                    .cloned()
                    .collect();
                let cmd_name = full.get_name().to_string();
                let about = full.get_about().cloned();
                let mut cmd = Command::new(cmd_name).infer_long_args(true);
                if let Some(a) = about {
                    cmd = cmd.about(a);
                }
                for sc in subcommands {
                    cmd = cmd.subcommand(sc);
                }
                if let Some(s) = shell {
                    let shell = match s.as_str() {
                        "bash" => Shell::Bash,
                        "zsh" => Shell::Zsh,
                        "fish" => Shell::Fish,
                        "elvish" => Shell::Elvish,
                        "powershell" => Shell::PowerShell,
                        _ => {
                            eprintln!("Unknown shell: {s}");
                            return Ok(());
                        }
                    };
                    generate(shell, &mut cmd, "rsp", &mut std::io::stdout());
                } else {
                    std::fs::create_dir_all("completions/")?;
                    let shells = [
                        (Shell::Bash, "bash"),
                        (Shell::Zsh, "zsh"),
                        (Shell::Fish, "fish"),
                        (Shell::Elvish, "elvish"),
                        (Shell::PowerShell, "powershell"),
                    ];
                    for (shell, ext) in &shells {
                        let path = format!("completions/rsp.{ext}");
                        let mut file = std::fs::File::create(&path)?;
                        generate(*shell, &mut cmd, "rsp", &mut file);
                        println!("Generated {path}");
                    }
                }
            }
            Commands::Lyrics => {
                let _ = crate::daemon::send_command("lyrics".to_string());
            }
        }
        Ok(())
    }
}