const whiskers = require('whiskers');
const fs = require('fs');

const PasteContent = require('../models/pasteContent.js').PasteContent;
const mCrypto = require('../src/crypto.js');
const Security = require('../src/security.js');

async function renderRawPage(app, res, entity) {
    if (entity.type === 'paste')
        return await app.routerUtils.staticServe(res, app.getData(entity.privId));
    app.routerUtils.onInternalError(res, "Unknown type: " +entity.type);
}

async function renderPublicPage(app, res, entity) {
    if (entity.type === 'paste')
        return await app.routerUtils.staticServe(res, app.getData(entity.privId));
    app.routerUtils.onInternalError(res, "Unknown type: " +entity.type);
}

function renderPrivatePage(app, res, entity) {
    let stat;
    try { stat = fs.statSync(app.dataDir+entity.privId); } catch (e) { stat = { error: e }; }
    app.routerUtils.jsonResponse(res, { ...entity.describe(), ...stat, ...{ path: app.getData(entity.privId) } });
}

module.exports = { register: app => {
    app.router.get("/", (req, res) => {
        app.routerUtils.redirect(res, '/pastit');
    });
    app.router.get("/pastit", (req, res) => {
        let context = app.routerUtils.commonRenderInfos();
        context.page_title += " - Pastit";
        res.end(whiskers.render(require('../templates/pastit.js'), context));
    });
    app.router.post("/pastit", async (req, res) => {
        const content = req.body.content;
        const privId = mCrypto.string(content);
        const captchaOk = await Security.captchaCheck(req.body['g-recaptcha-response'], req.headers['x-forwarded-for'] || req.socket.remoteAddress);
        let  entity = await app.databaseHelper.findOne(PasteContent, { privId: privId });

        if (!captchaOk)
            return app.routerUtils.jsonResponse(res, { err: "Invalid captcha input", id: null });
        if (!content || !content.length)
            return app.routerUtils.jsonResponse(res, { err: "Empty input", id: null });
        if (entity && !entity.expired) {
            entity.renew();
            await app.databaseHelper.update({privId: privId}, entity);
        } else {
            entity = entity || new PasteContent(privId, "paste");
            entity.expired = false;
            entity.renew();
            fs.writeFileSync(app.getData(privId), content);
            await app.databaseHelper.upsertOne(entity);
        }
        app.routerUtils.jsonResponse(res, { err: null, id: entity.publicId });
    });
    app.router.get("/pastit/:id", async (req, res) => {
        let entity = await app.databaseHelper.findOne(PasteContent, { privId: req.params.id, publicId: req.params.id }, " or ");
        if (entity && entity.privId === req.params.id)
            return renderPrivatePage(app, res, entity);
        if (entity && !entity.expired)
            return renderPublicPage(app, res, entity);
        app.routerUtils.onPageNotFound(res);
    });
    app.router.get("/pastit/raw/:id", async (req, res) => {
        let entity = await app.databaseHelper.findOne(PasteContent, { privId: req.params.id, publicId: req.params.id }, " or ");
        if (entity && !entity.expired)
            return renderRawPage(app, res, entity);
        app.routerUtils.onPageNotFound(res);
    });
}};