use clap::{AppSettings, Clap};
use serde_json::json;

/// Bert
#[derive(Clap, Debug)]
#[clap(version, author, about)]
#[clap(setting = AppSettings::ColoredHelp)]
struct Opts {
    /// Home Assistant host
    #[clap(short, long)]
    host: String,

    /// Media player entity ID
    #[clap(short, long)]
    entity: String,

    /// API token
    #[clap(short, long)]
    token: String,

    /// Use HTTP instead of HTTPS
    #[clap(short, long)]
    insecure: bool,

    #[clap(subcommand)]
    cmd: Option<Command>,
}

#[derive(Clap, Debug, Clone, Copy)]
enum Command {
    /// Toggle playback
    PlayPause,
    /// Raise volume
    VolumeUp,
    /// Lower volume
    VolumeDown,
}

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let opts = Opts::parse();

    if let Some(cmd) = opts.cmd {
        call_service(cmd, &opts)?;
    } else {
        let url = format!(
            "{}://{}/api/states/{}",
            if opts.insecure { "http" } else { "https" },
            opts.host,
            opts.entity
        );

        let client = reqwest::blocking::Client::new();
        let response = client
            .get(url)
            .bearer_auth(opts.token)
            .header("Accept", "application/json")
            .header("Content-Type", "application/json")
            .send()?
            .json::<serde_json::Value>()?;

        if response["state"] == "playing" {
            let attributes = &response["attributes"];
            let maybe_channel = attributes["media_channel"].as_str();
            let now_playing = if let Some(channel) = maybe_channel {
                format!(
                    "[{}] {} - {}",
                    channel,
                    attributes["media_artist"]
                        .as_str()
                        .map_or("No artist", |artist| { artist }),
                    attributes["media_title"]
                        .as_str()
                        .map_or("No title", |title| { title }),
                )
            } else {
                format!(
                    "{} - {}",
                    attributes["media_artist"]
                        .as_str()
                        .map_or("No artist", |artist| artist),
                    attributes["media_title"]
                        .as_str()
                        .map_or("No title", |title| title),
                )
            };

            println!("{}", now_playing);
        } else {
            println!(
                "Sonos {}",
                response["state"]
                    .as_str()
                    .map_or("state unknown", |state| state)
            );
        }
    }
    // println!("{:#?}", response);
    Ok(())
}

fn call_service(command: Command, opts: &Opts) -> Result<(), Box<dyn std::error::Error>> {
    let cmd = match command {
        Command::PlayPause => "media_play_pause",
        Command::VolumeUp => "volume_up",
        Command::VolumeDown => "volume_down",
    };

    let url = format!(
        "{}://{}/api/services/media_player/{}",
        if opts.insecure { "http" } else { "https" },
        opts.host,
        cmd
    );

    let body = json!({"entity_id": opts.entity.clone()}).to_string();

    let client = reqwest::blocking::Client::new();
    let response = client
        .post(url)
        .body(body)
        .bearer_auth(opts.token.clone())
        .header("Accept", "application/json")
        .header("Content-Type", "application/json")
        .send()?
        .json::<serde_json::Value>()?;

    println!("{:#?}", response);

    Ok(())
}