//! Handlers for Mod metadata that can be displayed in a GUI mod list or exported as a mod pack

use crate::package::content::Providers;
use crate::store::Loader;
use crate::utils::http::{write_icon, IoSemaphore};
use crate::utils::io;
use async_zip::tokio::read::fs::ZipFileReader;
use chrono::{DateTime, Utc};
use serde::{Deserialize, Serialize};
use std::collections::{HashMap, HashSet};
use std::path::{Path, PathBuf};
use tokio::fs::DirEntry;

use super::{ClusterPath, Clusters, Directories, PackagePath};

// TODO: Curseforge, Modrinth, SkyClient integration

/// Represents types of packages handled by the launcher.
#[cfg_attr(feature = "specta", derive(specta::Type))]
#[derive(Serialize, Deserialize, Clone, Copy, Debug, PartialEq, Eq, Hash)]
#[serde(rename_all = "lowercase")]
pub enum PackageType {
	/// Represents a mod jarfile
	Mod,
	/// Represents a datapack file
	DataPack,
	/// Represents a resourcepack file
	ResourcePack,
	/// Represents a shaderpack file
	ShaderPack,
	/// Represents a modpack file
	ModPack,
}

impl PackageType {
	/// attempt to get a [`PackageType`] from a loader string.
	pub fn from_loader(loaders: Vec<String>) -> Option<Self> {
		if loaders
			.iter()
			.any(|x| ["fabric", "forge", "quilt"].contains(&&**x))
		{
			Some(PackageType::Mod)
		} else if loaders.iter().any(|x| x == "datapack") {
			Some(PackageType::DataPack)
		} else if loaders.iter().any(|x| ["iris", "optifine"].contains(&&**x)) {
			Some(PackageType::ShaderPack)
		} else if loaders
			.iter()
			.any(|x| ["vanilla", "canvas", "minecraft"].contains(&&**x))
		{
			Some(PackageType::ResourcePack)
		} else {
			None
		}
	}

	pub fn from_parent(path: PathBuf) -> Option<Self> {
		let path = path.parent()?.file_name()?;
		match path.to_str()? {
			"mods" => Some(PackageType::Mod),
			"datapacks" => Some(PackageType::DataPack),
			"resourcepacks" => Some(PackageType::ResourcePack),
			"shaderpacks" => Some(PackageType::ShaderPack),
			"modpack" => Some(PackageType::ModPack),
			_ => None,
		}
	}

	pub fn get_name(&self) -> &'static str {
		match self {
			PackageType::Mod => "mod",
			PackageType::DataPack => "datapack",
			PackageType::ResourcePack => "resourcepack",
			PackageType::ShaderPack => "shaderpack",
			PackageType::ModPack => "modpack",
		}
	}

	pub fn get_folder(&self) -> &'static str {
		match self {
			PackageType::Mod => "mods",
			PackageType::DataPack => "datapacks",
			PackageType::ResourcePack => "resourcepacks",
			PackageType::ShaderPack => "shaderpacks",
			PackageType::ModPack => "modpack",
		}
	}

	pub fn get_meta(&self) -> PathBuf {
		PathBuf::from(format!(
			"{}/{}",
			self.get_folder(),
			self.get_meta_file_name()
		))
	}

	pub fn get_meta_file_name(&self) -> String {
		String::from(".packages.json")
	}

	pub async fn file_matches(&self, entry: &DirEntry) -> crate::Result<bool> {
		if !(entry.path().try_exists()?) {
			return Ok(false);
		}

		Ok(match self {
			PackageType::Mod => {
				entry.file_type().await?.is_file()
					&& entry.path().extension() == Some("jar".as_ref())
			}
			_ => false,
		})
	}

	pub fn iterator() -> impl Iterator<Item = PackageType> {
		[
			PackageType::Mod,
			PackageType::DataPack,
			PackageType::ResourcePack,
			PackageType::ShaderPack,
		]
		.iter()
		.copied()
	}
}

#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
#[cfg_attr(feature = "specta", derive(specta::Type))]
pub struct SearchResult {
	pub slug: String,
	pub title: String,
	pub description: String,
	#[serde(default)]
	pub categories: Vec<String>,
	pub client_side: PackageSide,
	pub server_side: PackageSide,
	pub project_type: PackageType,
	pub downloads: u32,
	#[serde(default)]
	pub icon_url: String,
	pub project_id: String,
	pub author: String,
	#[serde(default)]
	pub display_categories: Vec<String>,
	pub versions: Vec<String>,
	pub follows: u32,
	pub date_created: DateTime<Utc>,
	pub date_modified: DateTime<Utc>,
	#[serde(default)]
	pub license: Option<String>,
}

#[derive(Serialize, Deserialize, Clone, Debug)]
#[cfg_attr(feature = "specta", derive(specta::Type))]
pub struct ProviderSearchResults {
	pub provider: Providers,
	pub results: Vec<SearchResult>,
	pub total: u32,
}

/// A struct that represents a Package.
#[derive(Serialize, Deserialize, Clone, Debug)]
#[cfg_attr(feature = "specta", derive(specta::Type))]
pub struct Package {
	pub sha512: String,
	pub meta: PackageMetadata,
	pub file_name: String,
	pub disabled: bool,
}

impl Package {
	pub async fn new(path: &PackagePath, meta: PackageMetadata) -> crate::Result<Self> {
		let file_name = path
			.0
			.file_name()
			.ok_or_else(|| crate::ErrorKind::AnyhowError(anyhow::anyhow!("no file name")))?
			.to_string_lossy()
			.to_string();
		let sha512 = String::from("unknown");

		Ok(Self {
			sha512,
			meta,
			file_name,
			disabled: false,
		})
	}
}

pub type PackagesMap = HashMap<PackagePath, Package>;

pub(crate) struct Packages {
	managers: HashMap<ClusterPath, PackageManager>,
}

impl Packages {
	pub async fn initialize(dirs: &Directories, clusters: &Clusters) -> Self {
		let mut managers = HashMap::new();

		// TODO: This should probably not clone and store the cluster path in like 2 areas
		for cluster_path in clusters.0.keys() {
			let mgr = PackageManager::initialize(dirs, cluster_path.clone()).await;

			match mgr {
				Ok(mgr) => {
					managers.insert(cluster_path.clone(), mgr);
				}
				Err(e) => {
					tracing::error!(
						"failed to initialize package manager for cluster {}: {}. skipping",
						cluster_path,
						e
					);
				}
			};
		}

		Self { managers }
	}

	pub fn get(&self, cluster_path: &ClusterPath) -> Option<&PackageManager> {
		self.managers.get(cluster_path)
	}

	pub fn get_mut(&mut self, cluster_path: &ClusterPath) -> Option<&mut PackageManager> {
		self.managers.get_mut(cluster_path)
	}
}

#[cfg_attr(feature = "specta", derive(specta::Type))]
#[derive(Serialize, Deserialize, Clone, Debug)]
pub struct PackagesMeta {
	pub packages: PackagesMap,
	pub package_type: PackageType,
}

impl PackagesMeta {
	pub fn new(package_type: PackageType) -> Self {
		Self {
			packages: PackagesMap::new(),
			package_type,
		}
	}
}

#[derive(Debug)]
pub struct PackageManager {
	pub cluster_path: ClusterPath,
	mods: PackagesMeta,
	datapacks: PackagesMeta,
	resourcepacks: PackagesMeta,
	shaderpacks: PackagesMeta,
}

impl PackageManager {
	pub async fn initialize(dirs: &Directories, cluster_path: ClusterPath) -> crate::Result<Self> {
		let mut manager = Self::new(cluster_path);
		manager.sync_packages(dirs).await;

		Ok(manager)
	}

	pub fn new(cluster_path: ClusterPath) -> Self {
		Self {
			cluster_path,
			mods: PackagesMeta::new(PackageType::Mod),
			datapacks: PackagesMeta::new(PackageType::DataPack),
			resourcepacks: PackagesMeta::new(PackageType::ResourcePack),
			shaderpacks: PackagesMeta::new(PackageType::ShaderPack),
		}
	}

	pub async fn get_meta_file(
		&self,
		dirs: &Directories,
		package_type: PackageType,
	) -> crate::Result<PathBuf> {
		Ok(self
			.cluster_path
			.full_path_dirs(dirs)
			.await?
			.join(package_type.get_meta()))
	}

	/// Get the PackagesMeta for a specific package type. Does not sync.
	pub fn get(&self, package_type: PackageType) -> &PackagesMeta {
		match package_type {
			PackageType::Mod => &self.mods,
			PackageType::DataPack => &self.datapacks,
			PackageType::ResourcePack => &self.resourcepacks,
			PackageType::ShaderPack => &self.shaderpacks,
			_ => unreachable!(),
		}
	}

	/// Get the PackagesMeta for a specific package type. Does not sync.
	fn get_mut(&mut self, package_type: PackageType) -> &mut PackagesMeta {
		match package_type {
			PackageType::Mod => &mut self.mods,
			PackageType::DataPack => &mut self.datapacks,
			PackageType::ResourcePack => &mut self.resourcepacks,
			PackageType::ShaderPack => &mut self.shaderpacks,
			_ => unreachable!(),
		}
	}

	/// Get the PackagesMeta for a specific package type. Does not sync.
	#[tracing::instrument]
	async fn get_from_file(
		&self,
		dirs: &Directories,
		package_type: PackageType,
	) -> crate::Result<PackagesMeta> {
		let packages_meta = &self.get_meta_file(dirs, package_type).await?;

		let meta: PackagesMeta = if packages_meta.exists() && packages_meta.is_file() {
			if let Ok(meta) = serde_json::from_slice(&io::read(packages_meta).await?) {
				meta
			} else {
				io::copy(packages_meta, packages_meta.with_extension("bak")).await?;
				io::write(packages_meta, "{}").await?;
				PackagesMeta::new(package_type)
			}
		} else {
			io::write(packages_meta, "{}").await?;
			PackagesMeta::new(package_type)
		};

		Ok(meta)
	}

	// add a package to the manager
	#[tracing::instrument(skip(self, package))]
	pub async fn add_package(
		&mut self,
		package_path: PackagePath,
		package: Package,
		package_type: Option<PackageType>,
	) -> crate::Result<()> {
		let package_type = package
			.meta
			.get_package_type()
			.unwrap_or(package_type.ok_or(anyhow::anyhow!("no package type"))?);
		let packages = &mut self.get_mut(package_type).packages;
		packages.insert(package_path, package);

		Ok(())
	}

	// remove a package to the manager
	#[tracing::instrument(skip(self))]
	pub async fn remove_package(
		&mut self,
		package_path: &PackagePath,
		package_type: PackageType,
	) -> crate::Result<()> {
		let full_path = self.cluster_path.clone().full_path().await?.join(package_type.get_folder()).join(package_path.0.clone());
		io::remove_file(full_path).await?;

		let packages = &mut self.get_mut(package_type).packages;
		packages.remove(package_path);

		Ok(())
	}

	/// sync all packages
	#[tracing::instrument(skip(self, dirs))]
	pub async fn sync_packages(&mut self, dirs: &Directories) {
		tracing::info!("syncing packages for cluster {}", self.cluster_path);
		if let Err(err) = &self.sync_packages_by_type(dirs, PackageType::Mod).await {
			tracing::error!("failed to sync mods: {}", err);
		}

		if let Err(err) = &self
			.sync_packages_by_type(dirs, PackageType::DataPack)
			.await
		{
			tracing::error!("failed to sync datapacks: {}", err);
		}

		if let Err(err) = &self
			.sync_packages_by_type(dirs, PackageType::ResourcePack)
			.await
		{
			tracing::error!("failed to sync resourcepacks: {}", err);
		}

		if let Err(err) = &self
			.sync_packages_by_type(dirs, PackageType::ShaderPack)
			.await
		{
			tracing::error!("failed to sync shaderpacks: {}", err);
		}
	}

	/// sync packages from the metafile
	#[tracing::instrument(skip(self, dirs))]
	async fn sync_from_file_by_type(
		&mut self,
		dirs: &Directories,
		package_type: PackageType,
	) -> crate::Result<()> {
		let packages_meta = self.get_from_file(dirs, package_type).await?;
		self.get_mut(package_type).packages = packages_meta.packages;

		Ok(())
	}

	/// sync packages from the manager to the metafile
	#[tracing::instrument(skip(self, dirs))]
	async fn sync_to_file_by_type(
		&self,
		dirs: &Directories,
		package_type: PackageType,
	) -> crate::Result<()> {
		let packages_meta = self.get(package_type);
		let packages_meta = serde_json::to_string(&packages_meta)?;

		io::write(self.get_meta_file(dirs, package_type).await?, packages_meta).await?;

		Ok(())
	}

	/// returns a list of packages that have a file but are not synced in the manager
	#[tracing::instrument]
	async fn sync_packages_from_local(
		&self,
		dirs: &Directories,
		packages: &mut PackagesMap,
		package_type: PackageType,
	) -> crate::Result<()> {
		let mut files = io::read_dir(
			self.cluster_path
				.full_path_dirs(dirs)
				.await?
				.join(package_type.get_folder()),
		)
		.await?;

		let mut packages_to_keep = HashSet::<PackagePath>::new();

		while let Some(file) = files.next_entry().await? {
			// Skip .packages.json meta file
			if file.file_name()
				.to_string_lossy()
				.eq(&package_type.get_meta_file_name())
			{
				continue;
			}

			let package_path = PackagePath::new(&file.path());

			// Check if the file is in the packages list already
			if let Some(_package) = packages.get(&package_path) {
				// Package path is in manager and file system

				// match package.meta {
				// 	PackageMetadata::Unknown => {
				// 		// TODO: Infer
				// 	}
				// 	_ => {}
				// }
			} else {
				// Package path is not in the packages list but exists on file system, lets add it to the manager

				// TODO: Infer package
				let meta = PackageMetadata::Unknown;
				let package = Package::new(&package_path, meta).await?;

				packages.insert(package_path.clone(), package);
			}

			// Add the package to the set to not remove it from the manager
			packages_to_keep.insert(package_path);
		}

		if packages.len() != packages_to_keep.len() {
			packages.retain(|pkg_path, _| packages_to_keep.contains(pkg_path))
		}

		Ok(())
	}

	// sync packages in a cluster
	#[tracing::instrument]
	pub async fn sync_packages_by_type(
		&mut self,
		dirs: &Directories,
		package_type: PackageType,
	) -> crate::Result<()> {
		// Clone the current packages and merge them with the local package list
		let mut packages = self.get(package_type).packages.clone();
		let mut new_packages = self.get_from_file(dirs, package_type).await?.packages;
		packages.extend(new_packages.drain());

		// Sync the packages from FS
		self.sync_packages_from_local(dirs, &mut packages, package_type)
			.await?;

		// Finally store the new list in memory and on disk
		// TODO: Should probably only do this if the packages have changed
		self.get_mut(package_type).packages = packages;
		self.sync_to_file_by_type(dirs, package_type).await?;

		Ok(())
	}
}

/// Metadata that represents a [`Package`].
#[cfg_attr(feature = "specta", derive(specta::Type))]
#[derive(Serialize, Deserialize, Clone, Debug)]
#[serde(tag = "type", rename_all = "snake_case")]
pub enum PackageMetadata {
	Managed {
		package_id: String,
		provider: Providers,
		package_type: PackageType,
		title: String,
		version_id: String,
		version_formatted: String,
	},
	Mapped {
		title: Option<String>,
		description: Option<String>,
		authors: Vec<String>,
		version: Option<String>,
		icon: Option<PathBuf>,
		package_type: Option<PackageType>,
	},
	Unknown,
}

impl PackageMetadata {
	pub fn from_managed_package(package: ManagedPackage, version: ManagedVersion) -> Self {
		Self::Managed {
			package_id: package.id,
			version_id: version.id,
			version_formatted: version.version_id,
			title: package.title,
			provider: package.provider,
			package_type: package.package_type,
		}
	}

	pub fn get_package_type(&self) -> Option<PackageType> {
		match self {
			PackageMetadata::Managed { package_type, .. } => Some(*package_type),
			PackageMetadata::Mapped { package_type, .. } => *package_type,
			PackageMetadata::Unknown => None,
		}
	}
}

/// Universal metadata for any managed user from a Mod distribution platform.
#[cfg_attr(feature = "specta", derive(specta::Type))]
#[derive(Serialize, Deserialize, Clone, Debug)]
pub struct ManagedUser {
	pub id: String,
	pub username: String,
	#[serde(default)]
	pub url: Option<String>,
	#[serde(default)]
	pub avatar_url: Option<String>,
	#[serde(default)]
	pub bio: Option<String>,
	#[serde(default = "default_is_organization_user")]
	pub is_organization_user: bool,
	#[serde(default)]
	pub role: Option<String>,
}

fn default_is_organization_user() -> bool {
	false
}

#[cfg_attr(feature = "specta", derive(specta::Type))]
#[derive(Serialize, Deserialize, Clone, Debug)]
pub enum Author {
	Team {
		team: String,
		organization: Option<String>,
	},
	Users(Vec<ManagedUser>),
}

/// Universal metadata for any managed package from a Mod distribution platform.
#[cfg_attr(feature = "specta", derive(specta::Type))]
#[derive(Serialize, Deserialize, Clone, Debug)]
pub struct ManagedPackage {
	// Core Metadata
	pub provider: Providers,
	pub id: String,
	pub uid: Option<String>,
	pub package_type: PackageType,
	pub title: String,
	pub description: String,
	pub body: String,
	pub main: String,
	pub versions: Vec<String>,
	pub game_versions: Vec<String>,
	pub loaders: Vec<Loader>,
	pub icon_url: Option<String>,

	pub created: DateTime<Utc>,
	pub updated: DateTime<Utc>,
	pub client: PackageSide,
	pub server: PackageSide,
	pub downloads: u32,
	pub followers: u32,
	pub categories: Vec<String>,
	pub optional_categories: Option<Vec<String>>,
	pub license: Option<License>,
	pub author: Author,

	pub is_archived: bool,
}

#[cfg_attr(feature = "specta", derive(specta::Type))]
#[derive(Default, Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct License {
	#[serde(default)]
	pub id: String,
	#[serde(default)]
	pub name: String,
	#[serde(default)]
	pub url: Option<String>,
}

/// Universal managed package version of a package.
#[cfg_attr(feature = "specta", derive(specta::Type))]
#[derive(Serialize, Deserialize, Clone, Debug)]
pub struct ManagedVersion {
	pub id: String,
	pub package_id: String,
	pub author: String,
	pub name: String,

	pub featured: bool,
	pub version_id: String,
	pub changelog: String,
	pub changelog_url: Option<String>,

	pub published: DateTime<Utc>,
	pub downloads: u32,
	pub version_type: String,

	pub files: Vec<ManagedVersionFile>,
	pub deps: Vec<ManagedDependency>,
	pub game_versions: Vec<String>,
	pub loaders: Vec<Loader>,
}

impl ManagedVersion {
	pub fn get_primary_file(&self) -> Option<&ManagedVersionFile> {
		self.files.iter().find(|f| f.primary)
	}
}

/// Universal interface for managed package files.
#[cfg_attr(feature = "specta", derive(specta::Type))]
#[derive(Serialize, Deserialize, PartialEq, Clone, Debug)]
pub struct ManagedVersionFile {
	pub url: String,
	pub file_name: String,
	pub primary: bool,

	pub size: u32,
	pub file_type: Option<PackageFile>,
	pub hashes: HashMap<String, String>,
}

/// Universal interface for managed package dependencies.
#[cfg_attr(feature = "specta", derive(specta::Type))]
#[derive(Serialize, Deserialize, Clone, Debug)]
pub struct ManagedDependency {
	pub version_id: Option<String>,
	pub package_id: Option<String>,
	pub file_name: Option<String>,
	pub dependency_type: PackageDependency,
}

/// The type of a [`ManagedDependency`].
#[cfg_attr(feature = "specta", derive(specta::Type))]
#[derive(Serialize, Deserialize, Clone, Debug)]
pub enum PackageDependency {
	Required,
	Optional,
	Incompatible,
	Embedded,
}

/// The Client/Server side type of a [`Package`].
#[derive(Serialize, Deserialize, Clone, Debug, Eq, PartialEq)]
#[serde(rename_all = "snake_case")]
#[cfg_attr(feature = "specta", derive(specta::Type))]
pub enum PackageSide {
	Required,
	Optional,
	Unsupported,
	Unknown,
}

/// The file type of a [`Package`].
#[cfg_attr(feature = "specta", derive(specta::Type))]
#[derive(Serialize, Deserialize, PartialEq, Clone, Debug)]
#[serde(rename_all = "snake_case")]
pub enum PackageFile {
	RequiredPack,
	OptionalPack,
	Unknown,
}

#[tracing::instrument(skip(io_semaphore))]
#[onelauncher_macros::memory]
pub async fn read_icon(
	icon_path: Option<String>,
	cache_dir: &Path,
	path: &PathBuf,
	io_semaphore: &IoSemaphore,
) -> crate::Result<Option<PathBuf>> {
	if let Some(icon_path) = icon_path {
		let zip_reader = ZipFileReader::new(path).await;
		if let Ok(zip_reader) = zip_reader {
			let zip_idx_res = zip_reader
				.file()
				.entries()
				.iter()
				.position(|f| f.filename().as_str().unwrap_or_default() == icon_path);

			if let Some(zip_idx) = zip_idx_res {
				let mut bytes = Vec::new();
				if zip_reader
					.reader_with_entry(zip_idx)
					.await?
					.read_to_end_checked(&mut bytes)
					.await
					.is_ok()
				{
					let bytes = bytes::Bytes::from(bytes);
					let path = write_icon(&icon_path, cache_dir, bytes, io_semaphore).await?;

					return Ok(Some(path));
				}
			}
		}
	}

	Ok(None)
}