//! digital garden/wiki
//!
//!

mod api;
pub mod index;
mod markup;

pub use markup::PageFrontmatter;

use std::{str::FromStr, sync::Arc};

use axum::{
	Extension, Router,
	body::Body,
	extract::{Path, RawQuery},
	http::{StatusCode, header},
	response::Response,
	routing::{get, post},
};
use bempline::{Document, Options, options::IncludeMethod};
use camino::Utf8PathBuf;
use markup::PageTemplate;
use sessionhash::RequestContext;
use somethings::auth::Session;
use wikarden::{PathType, Wikarden};

use crate::{
	Query, RuntimeError,
	config::Settings,
	extractor::Wrap,
	fs::{self, RequestPath, SafePath},
	handler::{quark::markup::Source, temporary_redirect},
	state::SplormState,
};

/// nested `/quark`
///
/// returns quark related routes
pub fn routes() -> Router<SplormState> {
	Router::new()
		.route("/api/create/section", post(api::create_section))
		.route("/api/create", post(api::create))
		.route("/api/edit/section", post(api::edit_section))
		.route("/api/edit", post(api::edit))
		.route("/api/move", post(api::move_page))
		.route("/api/delete", post(api::delete))
		.route("/", get(index::index))
		.route("/{*name}", get(page))
}

/// redirect `/quark` to `/quark/`
///
/// if I didn't do this, the `/quark` nesting didn't catch `/quark/`,
/// for some reason, and it went down [`handler::static_path()`]
pub async fn redirect_index_not_directory() -> Result<Response, RuntimeError> {
	super::temporary_redirect("quark/".to_owned()).await
}

/// GET /quark/{*name}
async fn page(
	Extension(wikarden): Extension<Arc<Wikarden>>,
	Extension(settings): Extension<Settings>,
	Path(name): Path<String>,
	maybe_session: Option<Wrap<Session>>,
	ctx: RequestContext,
	RawQuery(rquery): RawQuery,
) -> Result<Response, RuntimeError> {
	tracing::info!("{ctx} GET /quark/{name}");

	if let Some(rq) = rquery {
		if let Ok(q) = Query::from_str(&rq) {
			if maybe_session.is_none() {
				return Err(RuntimeError::Generic403);
			}

			if q.has("edit") {
				return map_edit(name, &wikarden, settings).await;
			}

			if q.has("move") {
				return page_move(name, &wikarden, settings).await;
			}

			if q.has("delete") {
				return page_delete(name, settings).await;
			}
		}
	}

	// If we're serving the index, redirect there
	if name == settings.wikarden_index() {
		return temporary_redirect(format!(".")).await;
	}

	// Figure out if we're a Page or a Section. If we're a Section, check for a
	// section home and redirect there if we have one
	let resolved_path = match wikarden.path_type(&name).await {
		Some(PathType::Page) => name,
		Some(PathType::Section) => {
			let data = wikarden.get_section_data(&name).await?;
			if let Some(home) = data.home() {
				return temporary_redirect(home.to_string()).await;
			} else {
				name
			}
		}
		None => name,
	};

	PageTemplate::new(&settings, &wikarden, &resolved_path)
		.set_with_tools(maybe_session.is_some())
		.set_can_be_deleted(true)
		.set_can_be_moved(true)
		.rendered_response()
		.await
}

async fn map_edit(
	page: String,
	wik: &Wikarden,
	settings: Settings,
) -> Result<Response, RuntimeError> {
	match wik.path_type(&page).await {
		Some(PathType::Page) => page_edit(page, wik, settings).await,
		Some(PathType::Section) => section_edit(page, wik, settings).await,
		None => Err(RuntimeError::Generic404),
	}
}

/// handles page edits
///
/// Returns a `Response` of the editing page
///
/// [`page()`] calls into this if the `"edit"` query boolean-parameter is
/// present and if authentication is successful.
async fn page_edit(
	page: String,
	wik: &Wikarden,
	settings: Settings,
) -> Result<Response, RuntimeError> {
	let template_path = settings.quark_template_dir().join("minimal.html");
	let mut template = open_template_path(template_path, &settings).await?;

	let rp = RequestPath::verify_safe(settings.root(), "quark/edit.html")?;
	let edit = fs::read_file_to_string(rp.system_path()).await?;
	let mut page_template = open_template(&edit, rp.system_path(), &settings).await?;

	let src = match Source::from_wik(wik, &page).await {
		//FIXME: Make a variant for unfound wiki pages
		Err(_e) => return Err(RuntimeError::Generic404),
		Ok(src) => src,
	};

	page_template.set("page-editing", page);
	page_template.set("page-content", src.content());

	match src.frontmatter().description() {
		Some(desc) => page_template.set("og-description", desc),
		None => page_template.set("og-description", ""),
	}

	template.set("mainClass", "main-create");
	template.set("quarkForm", "true");
	template.set("main", page_template.compile());

	Response::builder()
		.status(StatusCode::OK)
		.header(header::CONTENT_TYPE, "text/html")
		.body(Body::from(template.compile()))
		.map_err(|_| RuntimeError::Unknown)
}

async fn page_move(
	page: String,
	wik: &Wikarden,
	settings: Settings,
) -> Result<Response, RuntimeError> {
	let template_path = settings.quark_template_dir().join("minimal.html");
	let mut template = open_template_path(template_path, &settings).await?;

	let rp = RequestPath::verify_safe(settings.root(), "quark/move.html")?;
	let edit = fs::read_file_to_string(rp.system_path()).await?;
	let mut page_template = open_template(&edit, rp.system_path(), &settings).await?;

	if !wik.page_exists(&page).await? {
		//FIXME: Make a variant for unfound wiki pages
		return Err(RuntimeError::Generic404);
	};

	page_template.set("page-moving", page);

	template.set("mainClass", "main-create");
	template.set("quarkForm", "true");
	template.set("main", page_template.compile());

	Response::builder()
		.status(StatusCode::OK)
		.header(header::CONTENT_TYPE, "text/html")
		.body(Body::from(template.compile()))
		.map_err(|_| RuntimeError::Unknown)
}

/// handles page deletion
///
/// Returns a `Response` of the deletion confirmation page
///
/// [`page()`] calls into this if the `"delete"` query boolean-parameter is
/// present and if authentication is successful
async fn page_delete(page: String, settings: Settings) -> Result<Response, RuntimeError> {
	let template_path = settings.quark_template_dir().join("minimal.html");
	let mut template = open_template_path(template_path, &settings).await?;

	let rp = RequestPath::verify_safe(settings.root(), "quark/delete.html")?;
	let delete = fs::read_file_to_string(rp.system_path()).await?;
	let mut page_template = open_template(&delete, rp.system_path(), &settings).await?;

	page_template.set("page", page);

	template.set("mainClass", "main-create");
	template.set("quarkForm", "true");
	template.set("main", page_template.compile());

	Response::builder()
		.status(StatusCode::OK)
		.header(header::CONTENT_TYPE, "text/html")
		.body(Body::from(template.compile()))
		.map_err(|_| RuntimeError::Unknown)
}

async fn section_edit(
	page: String,
	wik: &Wikarden,
	settings: Settings,
) -> Result<Response, RuntimeError> {
	let template_path = settings.quark_template_dir().join("minimal.html");
	let mut template = open_template_path(template_path, &settings).await?;

	let rp = RequestPath::verify_safe(settings.root(), "quark/edit-section.html")?;
	let edit = fs::read_file_to_string(rp.system_path()).await?;
	let mut page_template = open_template(&edit, rp.system_path(), &settings).await?;

	let data = match wik.get_section_data(&page).await {
		//FIXME: Make a variant for unfound wiki pages
		Err(_e) => return Err(RuntimeError::Generic404),
		Ok(data) => data,
	};

	page_template.set("section-editing", page);
	page_template.set(
		"section-home",
		data.home().map(|w| w.to_string()).unwrap_or_default(),
	);

	template.set("mainClass", "main-create");
	template.set("quarkForm", "true");
	template.set("main", page_template.compile());

	Response::builder()
		.status(StatusCode::OK)
		.header(header::CONTENT_TYPE, "text/html")
		.body(Body::from(template.compile()))
		.map_err(|_| RuntimeError::Unknown)
}

/// gets quark template from the filesystem
///
/// assumes quark templates are in the template directory under the `quark` sub-directory
pub async fn open_template_path<P: Into<Utf8PathBuf>>(
	path: P,
	settings: &Settings,
) -> Result<Document, RuntimeError> {
	let path = path.into();
	let str = fs::unsafe_read_file_to_string(path.clone()).await?;

	let options = Options::new().include_path(IncludeMethod::Path(
		settings.quark_template_dir().into_std_path_buf(),
	));
	Document::from_str(str, options).map_err(|perr| RuntimeError::template_parse_error(perr, path))
}

/// creates quark template from a `&str`
pub async fn open_template<'p>(
	content: &str,
	path: SafePath<'p>,
	settings: &Settings,
) -> Result<Document, RuntimeError> {
	let options = Options::new().include_path(IncludeMethod::Path(
		settings.quark_template_dir().into_std_path_buf(),
	));
	Document::from_str(content, options)
		.map_err(|perr| RuntimeError::template_parse_error(perr, path.to_path_buf()))
}