use std::{
    fs::{self, remove_file, File},
    io::{Read, Write},
    time::Duration,
};

use apis::modrinth::{get_game_versions, GameVersion, GameVersionType};
use errors::MLE;
use indicatif::{ProgressBar, ProgressStyle};
use serde::{Deserialize, Serialize};

use crate::{
    apis,
    errors::{self, Error},
    STYLE_MESSAGE,
};

#[derive(Debug, Clone, Deserialize, Serialize)]
pub enum VersionLevel {
    #[serde(rename(serialize = "release", deserialize = "release"))]
    Release,
    #[serde(rename(serialize = "snapshot", deserialize = "snapshot"))]
    Snapshot,
    Version(String),
}

/// Checks if update needed (time)
/// if yes: get versions, update
/// # Errors
pub async fn check_game_versions(path: &str, force: bool) -> MLE<()> {
    let p = ProgressBar::new(1);
    p.set_style(ProgressStyle::with_template(STYLE_MESSAGE)?);
    p.set_message("Update minecraft versions");

    let creation_time = fs::metadata(path)?.created()?;
    if !force && creation_time.elapsed()? < Duration::from_secs(60 * 60 * 24) {
        return Ok(());
    }

    let versions = get_game_versions().await?;
    remove_file(path)?;
    let mut file = File::create(path)?;
    file.write_all(serde_json::to_string_pretty(&versions)?.as_bytes())?;

    p.finish_with_message("Updated minecraft versions");
    Ok(())
}

/// Loads game versions from file
/// # Errors
pub fn load_game_versions(path: &str) -> MLE<Vec<GameVersion>> {
    let mut file = File::open(path)?;
    let mut data = String::new();
    file.read_to_string(&mut data)?;
    let versions: Vec<GameVersion> = serde_json::from_str(&data)?;
    Ok(versions)
}

impl VersionLevel {
    #[must_use] pub fn from(str: &str) -> Self {
        match str {
            "release" => VersionLevel::Release,
            "snapshot" => VersionLevel::Snapshot,
            _ => VersionLevel::Version(String::from(str)),
        }
    }

    /// .
    ///
    /// Panics if .
    /// # Errors
    pub async fn get(
        self,
        versions_path: &str,
        force_update: bool,
    ) -> MLE<String> {
        let path = format!("{versions_path}/versions.json");
        check_game_versions(&path, force_update).await?;
        let mut versions = load_game_versions(&path)?.into_iter();

        match self {
            VersionLevel::Release => {
                if let Some(release) = versions
                    .find(|ver| ver.version_type == GameVersionType::release)
                {
                    Ok(release.version)
                } else {
                    Err(Error::MinecraftVersionNotFound)
                }
            }
            VersionLevel::Snapshot => {
                if let Some(snapshot) = versions
                    .find(|ver| ver.version_type == GameVersionType::snapshot)
                {
                    Ok(snapshot.version)
                } else {
                    Err(Error::MinecraftVersionNotFound)
                }
            }
            VersionLevel::Version(v) => {
                if versions.any(|ver| ver.version == v) {
                    Ok(v)
                } else {
                    Err(Error::MinecraftVersionNotFound)
                }
            }
        }
    }
}