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import express from 'express';
import _ from 'underscore';

import {Source} from '../../../types/source.interfaces.js';
import {unwrapString} from '../../assert.js';
import {cached, cors} from '../middleware.js';
import {HttpController} from './controller.interfaces.js';

export class SourceController implements HttpController {
    public constructor(private readonly sources: Source[]) {}

    createRouter(): express.Router {
        const router = express.Router();
        router.get('/source/:source/list', cors, cached, this.listEntries.bind(this));
        router.get('/source/:source/load/:language/:filename', cors, cached, this.loadEntry.bind(this));
        return router;
    }

    /**
     * Handle request to `/source/<source>/list` endpoint
     */
    public async listEntries(req: express.Request, res: express.Response) {
        const source = this.getSourceForHandler(unwrapString(req.params.source));
        if (source === null) {
            res.sendStatus(404);
            return;
        }
        const entries = await source.list();
        res.json(entries);
    }

    /**
     * Handle request to `/source/<source>/load/<language>/<filename>` endpoint
     */
    public async loadEntry(req: express.Request, res: express.Response) {
        const source = this.getSourceForHandler(unwrapString(req.params.source));
        if (source === null) {
            res.sendStatus(404);
            return;
        }
        const entry = await source.load(unwrapString(req.params.language), unwrapString(req.params.filename));
        res.json(entry);
    }

    private getSourceForHandler(handler: string): Source | null {
        const records = _.indexBy(this.sources, 'urlpart');
        return records[handler] || null;
    }
}