/**
 * API Server
 */

import Koa from "koa";
import Router from "@koa/router";
import multer from "@koa/multer";
import bodyParser from "koa-bodyparser";
import cors from "@koa/cors";
import { apiMastodonCompatible, getClient } from "./mastodon/ApiMastodonCompatibleService.js";
import { Instances, AccessTokens, Users } from "@/models/index.js";
import config from "@/config/index.js";
import fs from "fs";
import endpoints from "./endpoints.js";
import compatibility from "./compatibility.js";
import handler from "./api-handler.js";
import signup from "./private/signup.js";
import signin from "./private/signin.js";
import signupPending from "./private/signup-pending.js";
import discord from "./service/discord.js";
import github from "./service/github.js";
import twitter from "./service/twitter.js";
import { koaBody } from "koa-body";

export enum IdType {
	CalckeyId,
	MastodonId
};

export function convertId(idIn: string, idConvertTo: IdType ) {
	let idArray = []
	switch (idConvertTo) {
		case IdType.MastodonId:
			idArray = [...idIn].map(item => item.charCodeAt(0));
			idArray = idArray.map(item => {
				if (item.toString().length < 3) {
					return `0${item.toString()}`
				}
				else return item.toString()
			});
			return idArray.join('');
		case IdType.CalckeyId:
			for (let i = 0; i < idIn.length; i += 3) {
				if ((idIn.length % 3) !== 0) {
					idIn = `0${idIn}`
				}
				idArray.push(idIn.slice(i, i+3));
			}
			idArray = idArray.map(item => String.fromCharCode(item));
			return idArray.join('');
	}
};

// Init app
const app = new Koa();

app.use(
	cors({
		origin: "*",
	}),
);

// No caching
app.use(async (ctx, next) => {
	ctx.set("Cache-Control", "private, max-age=0, must-revalidate");
	await next();
});

// Init router
const router = new Router();
const mastoRouter = new Router();
const mastoFileRouter = new Router();
const errorRouter = new Router();

// Init multer instance
const upload = multer({
	storage: multer.diskStorage({}),
	limits: {
		fileSize: config.maxFileSize || 262144000,
		files: 1,
	},
});

router.use(
	bodyParser({
		// リクエストが multipart/form-data でない限りはJSONだと見なす
		detectJSON: (ctx) =>
			!(
				ctx.is("multipart/form-data") ||
				ctx.is("application/x-www-form-urlencoded")
			),
	}),
);

mastoRouter.use(
	koaBody({
		multipart: true,
		urlencoded: true,
	}),
);


mastoFileRouter.post("/v1/media", upload.single("file"), async (ctx) => {
	const BASE_URL = `${ctx.protocol}://${ctx.hostname}`;
	const accessTokens = ctx.headers.authorization;
	const client = getClient(BASE_URL, accessTokens);
	try {
		let multipartData = await ctx.file;
		if (!multipartData) {
			ctx.body = { error: "No image" };
			ctx.status = 401;
			return;
		}
		const data = await client.uploadMedia(multipartData);
		ctx.body = data.data;
	} catch (e: any) {
		console.error(e);
		ctx.status = 401;
		ctx.body = e.response.data;
	}
});
mastoFileRouter.post("/v2/media", upload.single("file"), async (ctx) => {
	const BASE_URL = `${ctx.protocol}://${ctx.hostname}`;
	const accessTokens = ctx.headers.authorization;
	const client = getClient(BASE_URL, accessTokens);
	try {
		let multipartData = await ctx.file;
		if (!multipartData) {
			ctx.body = { error: "No image" };
			ctx.status = 401;
			return;
		}
		const data = await client.uploadMedia(multipartData);
		ctx.body = data.data;
	} catch (e: any) {
		console.error(e);
		ctx.status = 401;
		ctx.body = e.response.data;
	}
});

mastoRouter.use(async (ctx, next) => {
	if (ctx.request.query) {
		if (!ctx.request.body || Object.keys(ctx.request.body).length === 0) {
			ctx.request.body = ctx.request.query;
		} else {
			ctx.request.body = { ...ctx.request.body, ...ctx.request.query };
		}
	}
	await next();
});

apiMastodonCompatible(mastoRouter);

/**
 * Register endpoint handlers
 */
for (const endpoint of [...endpoints, ...compatibility]) {
	if (endpoint.meta.requireFile) {
		router.post(
			`/${endpoint.name}`,
			upload.single("file"),
			handler.bind(null, endpoint),
		);
	} else {
		// 後方互換性のため
		if (endpoint.name.includes("-")) {
			router.post(
				`/${endpoint.name.replace(/-/g, "_")}`,
				handler.bind(null, endpoint),
			);

			if (endpoint.meta.allowGet) {
				router.get(
					`/${endpoint.name.replace(/-/g, "_")}`,
					handler.bind(null, endpoint),
				);
			} else {
				router.get(`/${endpoint.name.replace(/-/g, "_")}`, async (ctx) => {
					ctx.status = 405;
				});
			}
		}

		router.post(`/${endpoint.name}`, handler.bind(null, endpoint));

		if (endpoint.meta.allowGet) {
			router.get(`/${endpoint.name}`, handler.bind(null, endpoint));
		} else {
			router.get(`/${endpoint.name}`, async (ctx) => {
				ctx.status = 405;
			});
		}
	}
}

router.post("/signup", signup);
router.post("/signin", signin);
router.post("/signup-pending", signupPending);

router.use(discord.routes());
router.use(github.routes());
router.use(twitter.routes());

router.get("/v1/instance/peers", async (ctx) => {
	const instances = await Instances.find({
		select: ["host"],
		where: {
			isSuspended: false,
		},
	});

	ctx.body = instances.map((instance) => instance.host);
});

router.post("/miauth/:session/check", async (ctx) => {
	const token = await AccessTokens.findOneBy({
		session: ctx.params.session,
	});

	if (token?.session != null && !token.fetched) {
		AccessTokens.update(token.id, {
			fetched: true,
		});

		ctx.body = {
			ok: true,
			token: token.token,
			user: await Users.pack(token.userId, null, { detail: true }),
		};
	} else {
		ctx.body = {
			ok: false,
		};
	}
});

// Return 404 for unknown API
errorRouter.all("(.*)", async (ctx) => {
	ctx.status = 404;
});

// Register router
app.use(mastoFileRouter.routes());
app.use(mastoRouter.routes());
app.use(mastoRouter.allowedMethods());
app.use(router.routes());
app.use(errorRouter.routes());

export default app;