const status = require("../util/statuses");
const bcrypt = require('bcrypt');
const joi = require("joi");
const { ObjectId } = require('mongodb');
const salt = 12;

module.exports = (middleware, users, plans) => {
    const router = require("express").Router();
    
    router.use(middleware);

    router.get('/home', async (req, res) => {
        res.render('dashboard', { user: req.user });
        return res.status(status.Ok);
    });

    router.get('/assets', (req, res) => {
        res.render('assets', { user: req.user });
        return res.status(status.Ok);
    });

    router.get('/plans', async (req, res) => {
        if (!req.session.email) {
            return res.status(status.Unauthorized).redirect('/login');
        }
    
        try {

            // console.log(req.user.email);
            const userPlans = await plans.find({userEmail: req.user.email }).toArray();
            // console.log(userPlans);
            res.render('plans', {
                user: req.user,
                plans: userPlans
            });
    
        } catch (err) {
            console.error("Error fetching plans:", err);
            req.session.errMessage = "Could not load your plans. Please try again.";
            res.status(status.InternalServerError).redirect('/home');
        }
    });

    router.get('/plans/:id', async (req, res) => {
        if (!req.session.email) {
            return res.status(status.Unauthorized).redirect('/login');
        }
    
        try {
            const planId = req.params.id;

            
            if (!ObjectId.isValid(planId)) {
                req.session.errMessage = "Invalid plan ID format.";
                return res.status(status.BadRequest).redirect('/plans');
            }

            const plan = await plans.findOne({ userEmail: req.user.email, _id: new ObjectId(planId) });

            if (!plan) {
                console.log(`Plan not found with ID: ${planId} for user: ${req.user.email}`);
                req.session.errMessage = "Plan not found or you do not have permission to view it.";
                return res.status(status.NotFound).redirect('/plans');
            }
            // console.log("Found plan:", plan);
            res.render('planDetail', { 
                user: req.user,
                plan: plan
            });
    
        } catch (err) {
            console.error("Error fetching plan:", err);
            req.session.errMessage = "Could not load your plan. Please try again.";
            res.status(status.InternalServerError).redirect('/home');
        }
    });

    router.get('/newPlan', (req, res) => {
        if (!req.session.email) {
            return res.status(status.Unauthorized).redirect('/login');
        }
        if(!req.user.financialData){
            req.session.errMessage = "Please complete your financial data before creating a plan.";
            return res.status(status.Unauthorized).redirect('/questionnaire');
        }
        const errMessage = req.session.errMessage;
        req.session.errMessage = ""; 
        res.render('newPlan', { user: req.user, errMessage: errMessage });
    });

    router.post('/newPlan', async (req, res) => {
        if (!req.session.email) {
            return res.status(status.Unauthorized).redirect('/login');
        }

            const planSchema = joi.object({
                name: joi.string().min(3).max(100).required(),
                retirementAge: joi.number().min(18).max(120).required(),
                retirementExpenses: joi.number().min(0).required(),
                retirementAssets: joi.number().min(0).required(),
                retirementLiabilities: joi.number().min(0).required(),
            });

            const validationOptions = { convert: true, abortEarly: false }; 
            const { error, value } = planSchema.validate(req.body, validationOptions);

            if (error) { 
                console.error("Plan validation error:", error.details);
                req.session.errMessage = "Invalid input: " + error.details.map(d => d.message.replace(/"/g, '')).join(', '); 
                res.status(status.BadRequest).redirect("/newPlan"); 
                return; 
            }
            const newPlan = {
                userEmail: req.user.email,
                name: value.name,
                retirementAge: value.retirementAge,
                retirementExpenses: value.retirementExpenses,
                retirementAssets: value.retirementAssets,
                retirementLiabilities: value.retirementLiabilities,
                progress: "0%"
            };

            try{
                await plans.insertOne(newPlan);
                req.session.errMessage = ""; 
                res.redirect('/plans'); 
            }
            catch(err){
                console.error("Error saving plan:", err);
                req.session.errMessage = "An error occurred while saving your plan. Please try again.";
                res.status(status.InternalServerError).redirect("/newPlan");
            }
        });

    router.get('/more', (req, res) => {
        res.render('more', { user: req.user });
        return res.status(status.Ok);
    });

    router.get('/profile', (req, res) => {
        res.render('profile', { user: req.user, errMessage: req.session.errMessage });
        return res.status(status.Ok);
    });

    router.get('/settings', (req, res) => {
        res.render('settings', { user: req.user });
        return res.status(status.Ok);
    });

    router.get('/questionnaire', (req, res) => {
        const errMessage = req.session.errMessage;
        req.session.errMessage = ""; 
        res.render('questionnaire', { user: req.user, errMessage: errMessage });
    });

    router.post('/questionnaire', (req, res) => {
        // console.log("Questionnaire POST body:", req.body);
  
        const questionnaireSchema = joi.object({
            dob: joi.date().required(),
            education: joi.string().valid('primary', 'secondary', 'tertiary', 'postgraduate').required(),
            maritalStatus: joi.string().valid('single', 'married', 'divorced', 'widowed').required(),
            income: joi.number().min(0).required(),
            expenses: joi.number().min(0).required(),
            assets: joi.number().min(0).required(),
            liabilities: joi.number().min(0).required(),
        });
    
        const validationOptions = { convert: true, abortEarly: false }; 
        const { error, value } = questionnaireSchema.validate(req.body, validationOptions);
    
        if (error) { 
            console.error("Questionnaire validation error:", error.details);
            req.session.errMessage = "Invalid input: " + error.details.map(d => d.message.replace(/"/g, '')).join(', '); 
            res.status(status.BadRequest).redirect("/questionnaire"); 
            return; 
        }
    
        users.updateOne( 
            { email: req.session.email }, 
            { 
                $set: { 
                    financialData: true, 
                    dob: value.dob,
                    education: value.education,
                    maritalStatus: value.maritalStatus,
                    income: value.income,
                    expenses: value.expenses,
                    assets: value.assets,
                    liabilities: value.liabilities,
                } 
            }
        ).then((result) => { 
            if (result.matchedCount === 0) {
                console.log(`User not found during questionnaire update: ${req.session.email}`);
                req.session.errMessage = "User session invalid. Please log in again."; 
                res.status(status.NotFound).redirect("/login"); 
                return;
            }
            if (result.modifiedCount === 0 && result.matchedCount === 1) {
                console.log(`User questionnaire data unchanged (already up-to-date): ${req.session.email}`);
            }
        
            req.session.errMessage = ""; 
            res.status(status.Ok).redirect("/home"); 
    
        }).catch(err => { 
            console.error("Error updating questionnaire in database:", err);
            req.session.errMessage = "An error occurred while saving your information. Please try again.";
            res.status(status.InternalServerError).redirect("/questionnaire"); 
        });
    });

    router.post("/updateAccount", async (req, res) => {
        const accountSchema = joi.object({
            email: joi.string().email(),
            name: joi.string().alphanum().max(20),
            password: joi.string().max(20).min(8),
            repassword: joi.string().max(20).min(8),
        });

        const valid = accountSchema.validate(req.body);

        if (valid.err) {
            req.session.errMessage = "Invalid input",
            res.status(status.BadRequest);
            return res.redirect("/profile");
        }

        let update = {
            // email: req.body.email,
            name: req.body.name,
        };

        if ((req.body.password != "") && (req.body.password != req.body.repassword)) {
            req.session.errMessage = "New passwords must match";
            res.status(status.BadRequest);
            return res.redirect("/profile");
        } else if (req.body.password != "") {
            let hashedPassword = await bcrypt.hashSync(req.body.password, salt);
            update.password = hashedPassword;
        }

        users.updateOne(
            { email: req.session.email },
            { $set: update }
        ).then((result) => {
            if (result.matchedCount === 0) {
                console.log(`User not found during account update: ${req.session.email}`);
                req.session.errMessage = "User session invalid. Please log in again."; 
                res.status(status.NotFound).redirect("/login"); 
                return;
            }
            if (result.modifiedCount === 0 && result.matchedCount === 1) {
                console.log(`User account data unchanged (already up-to-date): ${req.session.email}`);
            }
        
            req.session.errMessage = ""; 
            return res.status(status.Ok).redirect("/profile"); 
        }).catch(err => { 
            console.error("Error updating account in database:", err);
            req.session.errMessage = "An error occurred while saving your information. Please try again.";
            return res.status(status.InternalServerError).redirect("/profile"); 
        });
    });

    return router;
};