const config = require('./config');
const Koa = require('koa');
const fs = require('fs');
const logger = require('./utils/logger');

const onerror = require('./middleware/onerror');
const header = require('./middleware/header');
const utf8 = require('./middleware/utf8');
const memoryCache = require('./middleware/lru-cache');
const redisCache = require('./middleware/redis-cache');
const parameter = require('./middleware/parameter');
const template = require('./middleware/template');
const favicon = require('koa-favicon');
const debug = require('./middleware/debug');
const accessControl = require('./middleware/access-control');

const router = require('./router');
const protected_router = require('./protected_router');
const mount = require('koa-mount');

// API related

const apiTemplate = require('./middleware/api-template');
const api_router = require('./api_router');
const apiResponseHandler = require('./middleware/api-response-handler');

process.on('uncaughtException', (e) => {
    logger.error('uncaughtException: ' + e);
});

logger.info('🎉 RSSHub start! Cheers!');

const app = new Koa();
app.proxy = true;

// favicon
app.use(favicon(__dirname + '/favicon.png'));

// global error handing
app.use(onerror);

// 1 set header
app.use(header);

app.use(accessControl);

// 6 debug
app.context.debug = {
    hitCache: 0,
    request: 0,
    routes: [],
    ips: [],
};
app.use(debug);

// 5 fix incorrect `utf-8` characters
app.use(utf8);

app.use(apiTemplate);
app.use(apiResponseHandler());

// 4 generate body
app.use(template);
// 3 filter content
app.use(parameter);

// 2 cache
if (config.cacheType === 'memory') {
    app.use(
        memoryCache({
            app: app,
            expire: config.cacheExpire,
            ignoreQuery: true,
        })
    );
} else if (config.cacheType === 'redis') {
    app.use(
        redisCache({
            app: app,
            expire: config.cacheExpire,
            ignoreQuery: true,
            redis: config.redis,
            onerror: (e) => {
                logger.error('Redis error: ', e);
            },
            onconnect: () => {
                logger.info('Redis connected.');
            },
        })
    );
} else {
    app.context.cache = {
        get: () => null,
        set: () => null,
    };
}
app.context.cache.tryGet = async function(key, getValueFunc, maxAge = 24 * 60 * 60) {
    let v = await this.get(key);
    if (!v) {
        v = await getValueFunc();
        this.set(key, v, maxAge);
    } else {
        let parsed;
        try {
            parsed = JSON.parse(v);
        } catch (e) {
            parsed = null;
        }
        if (parsed) {
            v = parsed;
        }
    }

    return v;
};

// router

app.use(mount('/', router.routes())).use(router.allowedMethods());

// routes the require authentication
app.use(mount('/protected', protected_router.routes())).use(protected_router.allowedMethods());

// API router
app.use(mount('/api', api_router.routes())).use(api_router.allowedMethods());

// connect
if (config.connect.port) {
    app.listen(config.connect.port, parseInt(config.listenInaddrAny) ? null : '127.0.0.1');
    logger.info('Listening Port ' + config.connect.port);
}
if (config.connect.socket) {
    if (fs.existsSync(config.connect.socket)) {
        fs.unlinkSync(config.connect.socket);
    }
    app.listen(config.connect.socket, parseInt(config.listenInaddrAny) ? null : '127.0.0.1');
    logger.info('Listening Unix Socket ' + config.connect.socket);
    process.on('SIGINT', () => {
        fs.unlinkSync(config.connect.socket);
        process.exit();
    });
}

module.exports = app;