use crate::output::OutputChannel;
use crate::tile::TileData;
use crate::tiles;

use dbus::nonblock::SyncConnection;
use log::error;
use log::warn;
use serde::{Deserialize, Deserializer};
use smart_default::SmartDefault;
use std::env::var;

use std::path::Path;
use std::path::PathBuf;
use std::sync::Arc;
use std::time::Duration;
use structopt::StructOpt;
use tokio::fs::File;
use tokio::io::AsyncReadExt;
use tokio::sync::mpsc;
use tokio::task::JoinHandle;

#[derive(Deserialize, Clone, Debug, Default)]
#[serde(default)]
pub struct Config {
    pub default: DefaultSection,
    pub tile: Vec<TileConfig>,
}

#[derive(Deserialize, Clone, Debug, Default)]
pub struct DefaultSection {
    pub spacing: Option<u32>,
}

fn deserialize_duration<'de, D>(deserializer: D) -> Result<Duration, D::Error>
where
    D: Deserializer<'de>,
{
    let s = String::deserialize(deserializer)?;
    let number = s.trim_end_matches(char::is_alphabetic);
    let suffix = s.trim_start_matches(number);
    let number: f64 = number.parse().expect("Not a valid f64");
    let duration = match suffix {
        "s" | "" => Duration::from_secs_f64(number),
        "m" => Duration::from_secs_f64(number * 60f64),
        "ms" => Duration::from_secs_f64(number / 1000f64),
        _ => unimplemented!(),
    };
    Ok(duration)
}

#[derive(Deserialize, Clone, Debug)]
#[serde(tag = "type", rename_all = "snake_case")]
pub enum TileConfig {
    Battery(BatteryConfig),
    Memory(MemoryConfig),
    Load(LoadConfig),
    Hostname(HostnameConfig),
    UtcTime(UtcTimeConfig),
    SystemTime(SystemTimeConfig),
    LocalTime(LocalTimeConfig),
    InternetTime(InternetTimeConfig),
    Iwd(IwdConfig),
}

#[derive(SmartDefault, Deserialize, Clone, Debug)]
#[serde(default)]
pub struct BatteryConfig {
    #[default("BAT0")]
    pub battery: Box<str>,
    #[serde(deserialize_with = "deserialize_duration")]
    #[default(_code = "Duration::from_secs(30)")]
    pub update: Duration,
}

#[derive(SmartDefault, Deserialize, Clone, Debug)]
#[serde(default)]
pub struct MemoryConfig {
    #[serde(deserialize_with = "deserialize_duration")]
    #[default(_code = "Duration::from_secs(30)")]
    pub update: Duration,
}

#[derive(SmartDefault, Deserialize, Clone, Debug)]
#[serde(default)]
pub struct LoadConfig {
    #[serde(deserialize_with = "deserialize_duration")]
    #[default(_code = "Duration::from_secs(30)")]
    pub update: Duration,
}

#[derive(SmartDefault, Deserialize, Clone, Debug)]
#[serde(default)]
pub struct HostnameConfig {
    #[serde(deserialize_with = "deserialize_duration")]
    #[default(_code = "Duration::from_secs(3600)")]
    pub update: Duration,
}

#[derive(SmartDefault, Deserialize, Clone, Debug)]
#[serde(default)]
pub struct IwdConfig {
    #[default("wlan0")]
    pub interface: Box<str>,
    #[serde(deserialize_with = "deserialize_duration")]
    #[default(_code = "Duration::from_secs(5)")]
    pub update: Duration,
}

#[derive(SmartDefault, Deserialize, Clone, Debug)]
#[serde(default)]
pub struct UtcTimeConfig {
    #[default("%Y-%m-%d %H:%M:%S")]
    pub format: Box<str>,
    #[default("%H:%M:%S")]
    pub short_format: Box<str>,
    // No update field, update on the minute or second
}

#[derive(SmartDefault, Deserialize, Clone, Debug)]
#[serde(default)]
pub struct SystemTimeConfig {
    #[default("%Y-%m-%d %H:%M:%S %Z")]
    pub format: Box<str>,
    #[default("%H:%M:%S %Z")]
    pub short_format: Box<str>,
    // No update field, update on the minute or second
}

#[derive(SmartDefault, Deserialize, Clone, Debug)]
#[serde(default)]
pub struct LocalTimeConfig {
    #[default("%Y-%m-%d %H:%M:%S %Z")]
    pub format: Box<str>,
    #[default("%H:%M:%S %Z")]
    pub short_format: Box<str>,
    pub geoip_path: Option<Box<Path>>,
    #[serde(deserialize_with = "deserialize_duration")]
    #[default(_code = "Duration::from_secs(3600)")]
    pub update_interval: Duration,
    pub fallback_zone: Option<Box<str>>,
    #[default("https://myip.wtf/text")]
    pub ip_addr_api: Box<str>,
    // No update field, update on the minute or second
}

#[derive(SmartDefault, Deserialize, Clone, Debug)]
#[serde(default)]
pub struct InternetTimeConfig {
    #[default(2)]
    pub precision: u8,
    // No update field, update on the, uuh, wtf is metric time
}

#[derive(Debug, StructOpt)]
#[structopt(
    name = "rustybar",
    about = "Something to exec for your swaybar or i3bar"
)]
struct Args {
    /// Configuration file, default is $XDG_CONFIG_HOME/rustybar/config.toml
    #[structopt(short, long, parse(from_os_str))]
    pub config: Option<PathBuf>,
}

pub async fn read_config() -> eyre::Result<Config> {
    let args = Args::from_args();
    let config_path = match args.config {
        Some(config) => config,
        None => {
            if let Ok(rustybar_config_env) = var("RUSTYBAR_CONFIG") {
                rustybar_config_env.into()
            } else if let Ok(xdg_config_home) = var("XDG_CONFIG_HOME") {
                [&xdg_config_home, "rustybar", "config.toml"]
                    .iter()
                    .collect()
            } else if let Ok(home) = var("HOME") {
                [&home, ".config", "rustybar", "config.toml"]
                    .iter()
                    .collect()
            } else {
                eyre::bail!("Could not find RUSTYBAR_CONFIG, XDG_CONFIG_HOME, or HOME environment variables");
            }
        }
    };

    let mut config_contents = vec![];
    File::open(config_path)
        .await?
        .read_to_end(&mut config_contents)
        .await?;
    Ok(toml::from_str(std::str::from_utf8(&config_contents)?)?)
}

pub fn launch_tile(
    tile: TileConfig,
    sender: mpsc::Sender<TileData>,
    tile_id: usize,
    dbus_conn: Arc<SyncConnection>,
) -> JoinHandle<()> {
    tokio::spawn(async move {
        let output_chan = OutputChannel::with_random_uuid(sender, tile_id);
        let result = match tile {
            TileConfig::Battery(c) => tiles::battery(c, output_chan).await,
            TileConfig::Hostname(c) => tiles::hostname(c, output_chan, dbus_conn).await,
            TileConfig::Load(c) => tiles::load(c, output_chan).await,
            TileConfig::Memory(c) => tiles::memory(c, output_chan).await,
            TileConfig::UtcTime(c) => tiles::utc_time(c, output_chan).await,
            TileConfig::Iwd(c) => tiles::iwd(c, output_chan, dbus_conn).await,
            TileConfig::SystemTime(c) => tiles::system_time(c, output_chan).await,
            TileConfig::LocalTime(c) => tiles::local_time(c, output_chan).await,
            TileConfig::InternetTime(c) => tiles::internet_time(c, output_chan).await,
        };
        match result {
            Ok(_) => warn!("Tile {} exited without error", tile_id),
            Err(e) => error!("Tile {} exited with error: {:?}", tile_id, e),
        }
    })
}