use crate::{cache, config::Config, repo::ReadRepoMetadataError, templates};

use askama::Template;
use async_lock::Mutex;
use log::error;
use std::{
	collections::{BTreeMap, BTreeSet, HashMap},
	io::ErrorKind,
	path::PathBuf,
};
use trillium::{Conn, Handler};
use trillium_router::{Router, RouterConnExt};

pub async fn hello_world(conn: Conn) -> Conn {
	conn.ok("hello world!")
}

pub fn make_router(config: &'static Config) -> impl Handler {
	let mut hl_registry = giallo::Registry::builtin().unwrap();
	hl_registry.link_grammars();
	let hl_registry: &'static _ = Box::leak(Box::new(hl_registry));

	let metadata_cache: &'static _ = Box::leak(Box::new(Mutex::new(cache::Cache::<
		String,
		HashMap<String, String>,
	>::default())));
	let client: &'static _ = Box::leak(Box::new(async_lock::Mutex::new(
		crate::api_client::make_client(),
	)));

	(
		trillium_caching_headers::CachingHeaders::new(),
		//trillium_static_compiled::static_compiled!("./static").with_index_file("index.html"),
		Router::new()
			.get("/", |conn: Conn| async move {
				conn.ok(crate::templates::Home {}.render().unwrap())
			})
			.post("/fetch", move |mut conn: Conn| async move {
				if let Ok(request_body) = conn.request_body().await.with_max_len(8192).await {
					let mut repo_url = None;
					let mut commit_hash = None;
					for (key, val) in form_urlencoded::parse(request_body.as_bytes()) {
						match key.as_ref() {
							"repo-url" => {
								repo_url = Some(val);
							}
							"commit" => {
								commit_hash = Some(val);
							}
							_ => {}
						}
					}
					let (Some(repo_url), Some(commit_hash)) = (repo_url, commit_hash) else {
						return conn.ok("Missing arg");
					};

					let mut client = client.lock().await;
					let (repo_index, mut repo_metadata) =
						crate::api_client::fetch_repo_tree_index_at_commit(
							&mut client,
							&repo_url,
							&commit_hash,
							None,
						)
						.await
						.expect("todo handle error");
					crate::api_client::fetch_repo_files(
						config,
						&mut client,
						&repo_index,
						&mut repo_metadata,
						None,
					)
					.await
					.expect("todo handle error");
				}
				//let planet = conn.param("planet").unwrap();
				conn.ok(crate::templates::Home {}.render().unwrap())
			})
			.get("/r/:hash/*", move |conn: Conn| {
				async move {
					let Some(repo_hash_str) = conn.param("hash") else {
						return conn.with_status(401);
					};

					let cache_fetch = |key| {
						let mut repo_hash = [0; 32];
						if base64_turbo::URL_SAFE.decode_into(key, &mut repo_hash) != Ok(32) {
							return None;
						}
						let repo_dir = PathBuf::from(&config.data_dir)
							.join(crate::SUBDIR_REPOS)
							.join(repo_hash_str);
						let repo_metadata =
							match crate::repo::RepoMetadata::read_from_file(config, &repo_dir) {
								Ok(v) => v,
								Err(e) => {
									if let ReadRepoMetadataError::CannotOpenFile(e) = &e {
										if e.kind() == ErrorKind::NotFound {
											return None;
										}
									}
									error!("Reading repo metadata: {e:?}");
									return None;
								}
							};
						let mut entries = templates::Directory::default();
						for entry in repo_metadata.iter_files() {
							match entry {
								Ok(entry) => {
									let Some(name) = entry.file_path.rsplit('/').next() else {
										error!("Entry has no name");
										continue;
									};
									let path = entry.file_path.split('/').peekable();
									entries.insert(entry, path);
								}
								Err(e) => {
									error!("Reading repo metadata file index: {e:?}")
								}
							}
						}
						Some(files)
					};
					// TODO replace mutex with better thing (less contention or async mutex)
					let Some(metadata) = metadata_cache
						.lock()
						.await
						.fetch(repo_hash_str.to_string(), cache_fetch)
					else {
						return conn.with_status(404);
					};

					let hl_options = giallo::HighlightOptions::new(
						"py",
						giallo::ThemeVariant::Single("catppuccin-frappe"),
					);
					let highlighted = hl_registry
						.highlight("def foo():\n\tpass", &hl_options)
						.unwrap();
					let html = giallo::HtmlRenderer::default().render(
						&highlighted,
						&giallo::RenderOptions {
							show_line_numbers: true,
							..Default::default()
						},
					);
					conn.ok(crate::templates::Repo {
						content: html.clone(),
						entries: Vec::new(),
					}
					.render()
					.unwrap())
				}
			})
			.get("/e/:secret", |conn: Conn| async move {
				conn.ok(crate::templates::Home {}.render().unwrap())
			}),
	)
}