const express = require('express');
const config = require('../../config')
const data = require('../data')
const func = require('../functions')

let users = require('../../data/users.json');
let posts = require('../../data/posts.json');
let comments = require('../../data/comments.json');
let other_data = require('../../data/data.json');

const { fromUnixTime, format, getUnixTime } = require("date-fns") // A date utility library
const fs = require('fs')
const crypto = require('crypto')
const router = express.Router();

////////////////////// Form actions /////////////////////////
router.post("/submit_comment", (req,res) => {
    const unix_timestamp = getUnixTime(new Date())
    const postID = parseInt(req.body.post_index)
    const content = func.escape_input(req.body.content)
    let name = func.escape_input(req.body.name)
    if (name == "") {
        name = config.default_commenter_username
    }

    let comments = data.getdata('comments')

    new_comment = {
        "name": name,
        "content": content,
         "id": comments[postID].length,
         "pubdate": unix_timestamp,
         "postID": postID,
    };
    comments[postID].push(new_comment);
    fs.writeFileSync(`../data/comments.json`, `${JSON.stringify(comments)}`, 'utf-8');

    res.redirect(301,`/post/${req.body.post_index}`)
}); // /submit_comment

router.post("/submit_post", (req,res) => {
    const password = crypto.createHash('sha512').update(req.body.password).digest('hex');
    const username = func.escape_input(req.body.username)
    const title = func.escape_input(req.body.title)
    const content = req.body.content
    const tags = func.escape_input(req.body.tags).split(',').map(str => str.trim());
    const unix_timestamp = getUnixTime(new Date())

    if (func.get_userID(username) == -1) {
        res.render("partials/message", {
            message: locale.user_doesnt_exit,
            config,
        })
    }

    else if (users[func.get_userID(username)]['hash'] == password) { // Password matches
        console.log(username, "is submitting a post titled:", title);
        posts.push({
            "id": posts.length,
            "userID": func.get_userID(username),
                   "title": title,
                   "content": content,
                   "pubdate": unix_timestamp,
                   "editdate": unix_timestamp,
                   "tags": tags,
        })
        fs.writeFileSync(`../data/posts.json`, `${JSON.stringify(posts)}`, 'utf-8');
        comments.push([])
        fs.writeFileSync(`../data/comments.json`, `${JSON.stringify(comments)}`)
        res.redirect(302, "/");
    }
    else {
        res.render("partials/message", {
            message: locale.incorrect_password,
            config,
        })
    }
}); // /submit_post

router.post("/submit_signup", (req,res) => {
    const password =  crypto.createHash('sha512').update(req.body.password).digest('hex');
    const username = func.escape_input(req.body.username)
    const prettyname = func.escape_input(req.body.prettyname)
    const description = req.body.description

    // Check that signups are allowed
    if (config.allow_signup == true) {
        // func.get_userID will return -1 if the user does not exist
        // so this checks that the user does not exist
        if (func.get_userID(username) == -1) {
            users.push({
                "id": users.length,
                "username": username,
                "prettyname": prettyname,
                "hash": password,
                "description": description,
            })
            fs.writeFileSync(`../data/users.json`, `${JSON.stringify(users)}`, 'utf-8');
            res.redirect(301, `/user/${username}`)
        }
        // if the user does exist then
        else {
            res.render("partials/message", {
                message: locale.user_exists,
                config,
            })
        }
    }
    else if (config.allow_signup == false) {
        res.render("partials/message", {
            message: locale.signups_unavailable,
            config,
        })
    }
    // If allow_signup is undefined or not a boolean, error
    else {
        res.redirect(301,"/")
        console.log("Error, invalid value for allow_signup (bool)")
    }
}); // /submit_signup

router.post("/submit_edit_user", (req,res) => {
    // Get the form info
    const password = crypto.createHash("sha512").update(req.body.password).digest("hex");
    const userID = func.escape_input(req.body.userID)
    const description = req.body.description
    const prettyname = func.escape_input(req.body.prettyname)
    const delete_bool = req.body.delete

    if (userID >= 0) { // The user exists
        if (password == users[userID]['hash']) { // password matches
            console.log(userID, " (userID) is modifying their account")
            users[userID]["prettyname"] = prettyname;
            users[userID]["description"] = description;

            if (delete_bool == true) {
                // Delete the user
                users[userID] = {"id": userID,"deleted": true}
                // Delete all their posts
                for (let postid = 0; postid < posts.length; postid++) { // loop over all posts
                    if (posts[postid]['userID'] == userID) { // if userID matches
                        posts[postid] = {"id": postid, "deleted": true} // delete the post
                        comments[postid] = [] // the comments for this post should also be deleted
                    }
                };
            }
            // Write these changes
            fs.writeFileSync(`../data/users.json`, `${JSON.stringify(users)}`, 'utf-8');
            fs.writeFileSync(`../data/posts.json`, `${JSON.stringify(posts)}`, 'utf-8');
            fs.writeFileSync(`../data/comments.json`, `${JSON.stringify(comments)}`, 'utf-8');
            res.redirect(301,`/user/${users[userID]["username"]}`)
        }
        else { // password does not match
            res.render("partials/message", {
                message: locale.incorrect_password,
                config
            }
            )
        };
    }
    else {
        res.render("partials/message", {
            message: locale.user_doesnt_exist,
            config,
        })
    }
}); // /submit_delete_account

router.post("/submit_edit_post", (req,res) => {
    const password = crypto.createHash('sha512').update(req.body.password).digest('hex');
    const postID = req.body.postID
    const userID = req.body.userID
    const title = func.escape_input(req.body.title)
    const content = req.body.content
    const tags = func.escape_input(req.body.tags).split(",").map(str => str.trim());
    const delete_bool = req.body.delete
    const unix_timestamp = getUnixTime(new Date())
    console.log(users[userID]['prettyname'], "is editting the post titled:", title);

    if (users[userID]['hash'] == password) { // password matches
        let post = posts[postID]
        post['title'] = title
        post['content'] = content
        post['tags'] = tags
        post['editdate'] = unix_timestamp
        if (typeof delete_bool != "undefined") {
            console.log("Deleting post!")
            posts[postID] = {"id": post["id"], "deleted": true}
            comments[postID] = [];
            fs.writeFileSync(`../data/comments.json`, `${JSON.stringify(comments)}`, 'utf-8');
        }
        fs.writeFileSync(`../data/posts.json`, `${JSON.stringify(posts)}`, 'utf-8');
        res.redirect(302, "/");
    }
    else {
        res.render("partials/message", {
            message: locale.incorrect_password,
            config,
        })
    }
}); // /submit_edit

module.exports = router;