const express = require("express");
const router = express.Router();

const db = require("../dependencies");
const { update } = require("./reset");

// Fix if balance is null
function fix_balance_is_null(acc) {
    if (acc["localBalance"] == null) {
        acc["localBalance"] = 0;
    }
    if (acc["balance"] == null) {
        acc["balance"] = 0;
    }
}

// Get subaccounts from database, recursivly calls return_account
// Fuck IO we ball
function get_subaccounts(acc) {
    var base_query = `SELECT number, name, qualifiedName, description, type, tf.balance, te.localBalance, parentAccount  FROM accounts 
    LEFT JOIN (SELECT SUM(amount) as localBalance, account_name FROM transaction_entries GROUP BY account_name) te ON te.account_name = qualifiedName
    LEFT JOIN (SELECT SUM(amount) as balance, account_name FROM transaction_entries GROUP BY account_name) tf ON tf.account_name = qualifiedName
    WHERE parentAccount = ?`;

    var subs = [];
    const accs = db.prepare(base_query).all(acc["qualifiedName"]);
    for (let i = 0; i < accs.length; i++) {
        var one_sub = return_account(accs[i]);
        fix_balance_is_null(one_sub);
        acc["balance"] = acc["balance"] + one_sub["balance"];
        subs.push(one_sub);
    }
    return subs;
}

// Get important account info out of account, recursivly calls get_subaccounts
function return_account(acc) {
    test = {
        number: acc["number"],
        name: acc["name"],
        qualifiedName: acc["qualifiedName"],
        description: acc["description"],
        type: acc["type"],
        localBalance: acc["localBalance"],
        subaccounts: get_subaccounts(acc),
        balance: acc["balance"],
    };
    return test;
}

router.get("/", (req, res) => {
    var base_query = `SELECT number, name, qualifiedName, description, type, tf.balance, te.localBalance, parentAccount  FROM accounts 
    LEFT JOIN (SELECT SUM(amount) as localBalance, account_name FROM transaction_entries GROUP BY account_name) te ON te.account_name = qualifiedName
    LEFT JOIN (SELECT SUM(amount) as balance, account_name FROM transaction_entries GROUP BY account_name) tf ON tf.account_name = qualifiedName`;
    const accs = db.prepare(base_query).all();

    var real_accs = [];

    for (let i = 0; i < accs.length; i++) {
        fix_balance_is_null(accs[i]);

        if (accs[i]["parentAccount"] == null) {
            real_accs.push(return_account(accs[i]));
        }
    }
    res.send(real_accs);
});

router.post("/", (req, res) => {
    const number = req.body.number;
    const name = req.body.name;
    const des = req.body.description;
    const type = req.body.type;
    var qualifiedName;
    if (req.body.parentAccount =="--- Wurzel Konto ---") {
        qualifiedName = name;
    } else {
        qualifiedName = req.body.parentAccount + ":" + name;
    }
    const new_acc = db
        .prepare(
            `INSERT INTO accounts (number, name, qualifiedName, description, type, parentAccount) VALUES (?, ?, ? ,?, ?, ?)`,
        )
        .run(number, name, qualifiedName, des, type, req.body.parentAccount);
    res.status(204).send();

    for (res of update.values()) {
        // res.write("data: update\n\n")
        res.write("event: update\n");
        res.write("data: {}\n\n");
    }
});

router.get("/:account", (req, res) => {
    var base_query = `SELECT number, name, qualifiedName, description, type, tf.balance, te.localBalance  FROM accounts 
    LEFT JOIN (SELECT SUM(amount) as localBalance, account_name FROM transaction_entries GROUP BY account_name) te ON te.account_name = qualifiedName
    LEFT JOIN (SELECT SUM(amount) as balance, account_name FROM transaction_entries GROUP BY account_name) tf ON tf.account_name = qualifiedName
    WHERE qualifiedName = ?`;
    const acc = db.prepare(base_query).get(req.params.account);
    console.log(acc)


    if (acc == undefined) {
        res.status(404).send({
            code: 404,
            message: "Account not found",
            additionalPropl: {},
        });
    } else {
        fix_balance_is_null(acc);
        
        var real_acc;

        fix_balance_is_null(acc);

        if (acc["parentAccount"] == null) {
            real_acc = return_account(acc);
        }
        acc["balance"] = real_acc["balance"]

        entries = db
            .prepare(
                `
                SELECT 
	        transaction_entries.transaction_id as id,
                offsetAccounts,
                transaction_entries.amount,
                transaction_entries.label,
                postingDate,
                valueDate,
                title
                from transaction_entries 
                JOIN transactions ON transaction_entries.transaction_id = transactions.transaction_id
                JOIN (SELECT account_name as offsetAccounts, transaction_id FROM transaction_entries) te ON te.transaction_id = id  AND offsetAccounts IS NOT transaction_entries.account_name
                WHERE transaction_entries.account_name = ?`,
            )
            .all(req.params.account);
        acc["entries"] = entries;
        res.send(acc);
    }
});

router.put("/:account", (req, res) => {
    const oldname = req.params.account;
    const name = req.body.name;
    const description = req.body.description;
    const type = req.body.type;
    const qualifiedName = req.body.parentAccount + ":" + name;

    const acc = db
        .prepare(
            `UPDATE accounts SET description = ?, name = ?, qualifiedName = ?, type = ? WHERE name=?`,
        )
        .run(description, name, qualifiedName, type, oldname);

    if (acc == undefined) {
        res.status(404).send({
            code: 404,
            message: "Account not found",
            additionalPropl: {},
        });
    } else {
        res.status(204).send();
        for (res of update.values()) {
            // res.write("data: update\n\n")
            res.write("event: update\n");
            res.write("data: {}\n\n");
        }
    }
});

router.delete("/:account", (req, res) => {
    const acc = db
        .prepare("DELETE FROM accounts WHERE name = ? RETURNING *")
        .run(req.params.account);

    res.status(200).send();
    for (res of update.values()) {
        // res.write("data: update\n\n")
        res.write("event: update\n");
        res.write("data: {}\n\n");
    }
});

module.exports = router;