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

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

async function renderRawPage(app, req, res, entity) {
    if (entity.type === 'paste')
        return await app.routerUtils.staticServe(res, app.getData(entity.privId));
    else if (entity.type === 'file') {
        let data = JSON.parse(entity.data);
        return await app.routerUtils.staticDownload(res, app.getData(entity.privId), data.name, data.type);
    }
    else if (entity.type === 'short')
        return res.end(entity.data); // FIXME stats + ?rel
    app.routerUtils.onInternalError(res, "Unknown type: " +entity.type);
}

async function renderPublicPage(app, req, res, entity) {
    if (entity.type === 'paste')
        return await app.routerUtils.staticServe(res, app.getData(entity.privId));
    else if (entity.type === 'file') {
        let data = JSON.parse(entity.data);
        // FIXME viewer
        return await app.routerUtils.staticDownload(res, app.getData(entity.privId), data.name, data.type);
    }
    else if (entity.type === 'short')
        return app.routerUtils.redirect(res, entity.data);
    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 => {
    // Root
    app.router.get("/", (req, res) => {
        app.routerUtils.redirect(res, '/pastit');
    });

    // Access page
    app.router.get("/x/: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, req, res, entity);
        app.routerUtils.onPageNotFound(res);
    });
    app.router.get("/x/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, req, res, entity);
        app.routerUtils.onPageNotFound(res);
    });

    // pastebin tool
    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 || req.post);
        const privId = mCrypto.string(content);

        if (req.body['g-recaptcha-response']) {
            const captchaOk = await Security.captchaCheck(req.body['g-recaptcha-response'], Security.getRequestIp(req));
            if (!captchaOk)
                return app.routerUtils.jsonResponse(res, { err: "Invalid captcha input", id: null });
        } else if (req.body['apiKey']) {
            if (!(await app.databaseHelper.findOne(ApiKeyModel, { apiKey: req.body['apiKey'] })))
                return app.routerUtils.jsonResponse(res, { err: "Unauthorized access", id: null });
        } else {
            return app.routerUtils.jsonResponse(res, { err: "Unauthorized access", id: null });
        }
        let entity = await app.databaseHelper.findOne(PasteContent, { privId: privId });

        if (!content || !content.length)
            return app.routerUtils.jsonResponse(res, { err: "Empty input", id: null });
        if (content.length > CONFIG.maxPastebinSize)
            return app.routerUtils.jsonResponse(res, { err: "Input size is too large", id: null });
        if (entity && !entity.expired) {
            entity.renew();
            await app.databaseHelper.update({privId: privId}, entity);
        } else {
            entity = entity || new PasteContent(privId, "paste", Security.getRequestIp(req));
            entity.expired = false;
            entity.apiKey = req.body['apiKey'] || null;
            entity.renew();
            fs.writeFileSync(app.getData(privId), content);
            await app.databaseHelper.upsertOne(entity);
        }
        if (req.body.apiKey)
            res.end(CONFIG.url+"/x/" +entity.publicId+"\r\n");
        else
            app.routerUtils.jsonResponse(res, { err: null, id: entity.publicId });
    });

    // URL shortener tool
    app.router.get("/short", (req, res) => {
        let context = app.routerUtils.commonRenderInfos();
        context.page_title += " - Shortener";
        res.end(whiskers.render(require('../templates/short.js'), context));
    });
    app.router.post("/short", async (req, res) => {
        const link = "" + req.body.content;
        const privId = mCrypto.string(await app.databaseHelper.count(PasteContent) + link);
        const captchaOk = await Security.captchaCheck(req.body['g-recaptcha-response'], Security.getRequestIp(req));

        if (!captchaOk)
            return app.routerUtils.jsonResponse(res, { err: "Invalid captcha input", id: null });
        if (!link || !link.length)
            return app.routerUtils.jsonResponse(res, { err: "Empty input", id: null });
        if (link.length > CONFIG.maxUrlSize)
            return app.routerUtils.jsonResponse(res, { err: "Input size is too large", id: null });
        entity = new PasteContent(privId, "short", Security.getRequestIp(req));
        entity.data = link;
        await app.databaseHelper.insertOne(entity);
        app.routerUtils.jsonResponse(res, { err: null, id: entity.privId });
    });

    // Files tool
    app.router.get("/files", (req, res) => {
        let context = app.routerUtils.commonRenderInfos();
        context.page_title += " - File host";
        res.end(whiskers.render(require('../templates/files.js'), context));
    });
    app.router.post("/files", async (req, res) => {
        const formData = (req.body["multipart-data"] || []).reduce((res, x) => { res[x.fieldName] = x; return res; }, {});
        const privId = mCrypto.string(await app.databaseHelper.count(PasteContent) + (req.content?.fileName || ""));
        const captchaOk = await Security.captchaCheck(formData["g-recaptcha-response"]?.fileData, req.headers['x-forwarded-for'] || req.socket.remoteAddress);

        if (!captchaOk)
            return app.routerUtils.jsonResponse(res, { err: "Invalid captcha input", id: null });
        if (!formData.content?.fileData || !formData.content.fileData.length)
            return app.routerUtils.jsonResponse(res, { err: "Empty input", id: null });
        if (formData.content.fileData.length > CONFIG.maxFileUploadSize)
            return app.routerUtils.jsonResponse(res, { err: "Input size is too large", id: null });
        const entity = new PasteContent(privId, "file", Security.getRequestIp(req));
        entity.data = JSON.stringify({ name: formData.content.fileName, type: formData.content.fileType });
        fs.writeFileSync(app.getData(privId), formData.content.fileData, {encoding: formData.content.fileType.indexOf('text') >= 0 ? 'utf8' : 'binary'});
        await app.databaseHelper.insertOne(entity);
        app.routerUtils.jsonResponse(res, { err: null, id: entity.privId });
    });

    // API page
    app.router.get("/api", (req, res) => {
        let context = app.routerUtils.commonRenderInfos();
        context.page_title += " - API Usage";
        res.end(whiskers.render(require('../templates/api.js'), context));
    });
    app.router.post("/api", async (req, res) => {
        const ipAddress = req.headers['x-forwarded-for'] || req.socket.remoteAddress;
        const captchaOk = await Security.captchaCheck(req.body['g-recaptcha-response'], Security.getRequestIp(req));

        if (!captchaOk)
            return app.routerUtils.jsonResponse(res, { err: "Invalid captcha input", id: null });
        const privKey = mCrypto.string(Date.now() + "" + await app.databaseHelper.count(ApiKeyModel) + "SALT_INPUT_API_KEY" +ipAddress);
        const model = new ApiKeyModel(privKey, ipAddress);
        await app.databaseHelper.insertOne(model);
        return app.routerUtils.jsonResponse(res, { err: null, id: privKey });
    });
}};