pub mod apis;
pub mod cache;
pub mod commands;
pub mod config;
pub mod db;
pub mod error;
pub mod files;

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

pub use apis::*;
use apis::modrinth::{get_game_versions, GameVersion, GameVersionType};
pub use commands::*;
use error::{ErrorType, MLError, MLE};
use serde::{Deserialize, Serialize, de::Visitor};

#[derive(Debug, Clone, PartialEq, Eq)]
pub enum Modloader {
    Fabric,
    Forge,
}

impl Modloader {
    pub fn from(string: &str) -> MLE<Modloader> {
        match string {
            "forge" => Ok(Modloader::Forge),
            "fabric" => Ok(Modloader::Fabric),
            _ => Err(MLError::new(ErrorType::ArgumentError, "UNKNOWN_MODLOADER")),
        }
    }
}

impl Display for Modloader {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            Modloader::Fabric => write!(f, "fabric"),
            Modloader::Forge => write!(f, "forge"),
        }
    }
}

impl Serialize for Modloader {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
        where
            S: serde::Serializer {
        match self {
            Modloader::Fabric => serializer.serialize_str("fabric"),
            Modloader::Forge => serializer.serialize_str("forge"),
        }
    }
}

impl<'de> Deserialize<'de> for Modloader {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
    D: serde::Deserializer<'de>,
    {
        struct FieldVisitor;

        impl<'de> Visitor<'de> for FieldVisitor {
            type Value = Modloader;

            fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
                formatter.write_str("`fabric`, `forge` or `quilt`")
            }

            fn visit_str<E>(self, v: &str) -> Result<Modloader, E>
                where
                    E: serde::de::Error, {
                match v {
                    "fabric" => Ok(Modloader::Fabric),
                    "forge" => Ok(Modloader::Forge),
                    _ => Err(serde::de::Error::unknown_field(v, &["fabric", "forge", "quilt"]))
                }
            }
        }

        deserializer.deserialize_identifier(FieldVisitor)
    }
}

#[derive(Debug, Clone)]
pub enum VersionLevel {
    Release,
    Snapshot,
    Version(String)
}

/// Checks if update needed (time)
/// if yes: get versions, update
pub async fn check_game_versions(path: &str, force: bool) -> MLE<()> {
    let creation_time = fs::metadata(path)?.created()?;
    if !force && creation_time.elapsed().unwrap() < Duration::from_secs(60 * 60 * 24) { return Ok(()); }
    print!("Update minecraft versions");
    std::io::stdout().flush()?;
    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())?;
    println!(" ✓");
    Ok(())
}

/// Loads game versions
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 {

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

    pub fn get(self, versions_path: &str) -> MLE<String> {
        let path = format!("{}/versions.json", versions_path);
        let mut versions = load_game_versions(&path)?.into_iter();

        match self {
            VersionLevel::Release => {
                let release = versions.find(|ver| ver.version_type == GameVersionType::release).unwrap();
                println!("{:?}", release);
                Ok(release.version)
            },
            VersionLevel::Snapshot => {
                let snapshot = versions.find(|ver| ver.version_type == GameVersionType::snapshot).unwrap();
                println!("{:?}", snapshot);
                Ok(snapshot.version)
            },
            VersionLevel::Version(v) => {
                if versions.find(|ver| ver.version == v).is_some() {
                    Ok(v)
                } else {
                    Err(MLError::new(ErrorType::ConfigError, "unknown minecraft version"))
                }
            },
        }
    }
}

impl Serialize for VersionLevel {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
        where
            S: serde::Serializer {
        match self {
            VersionLevel::Release => serializer.serialize_str("release"),
            VersionLevel::Snapshot => serializer.serialize_str("snapshot"),
            VersionLevel::Version(v) => serializer.serialize_str(v),
        }
    }
}

impl<'de> Deserialize<'de> for VersionLevel {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
    D: serde::Deserializer<'de>,
    {
        struct FieldVisitor;

        impl<'de> Visitor<'de> for FieldVisitor {
            type Value = VersionLevel;

            fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
                formatter.write_str("`fabric`, `forge` or `quilt`")
            }

            fn visit_str<E>(self, v: &str) -> Result<VersionLevel, E>
                where
                    E: serde::de::Error, {
                match v {
                    "release" => Ok(VersionLevel::Release),
                    "snapshot" => Ok(VersionLevel::Snapshot),
                    _ => Ok(VersionLevel::Version(String::from(v)))
                }
            }
        }

        deserializer.deserialize_identifier(FieldVisitor)
    }
}