const { SlashCommandBuilder, EmbedBuilder } = require('discord.js');

module.exports = {
    category: 'utility',
    global: true,
    data: new SlashCommandBuilder()
        .setName('budget')
        .setDescription('The thing')
        .addSubcommand(subcommand =>
            subcommand
                .setName('set')
                .setDescription('Set weekly budget')
                .addIntegerOption(option =>
                    option.setName('amount')
                        .setRequired(true)
                        .setDescription('Amount as int'))
                .addBooleanOption(option =>
                    option.setName('override')
                        .setRequired(false)
                        .setDescription('Override budget of current period'))
        )
        .addSubcommand(subcommand =>
            subcommand
                .setName('view')
                .setDescription('View your grocery spendings for the current or previous week')
                .addBooleanOption(option =>
                    option
                        .setName('lastweek')
                        .setDescription('Show spendings from the previous budget cycle instead of the current one')
                        .setRequired(false)
                )
        )
        .addSubcommand(subcommand =>
            subcommand
                .setName('stats')
                .setDescription('View detailed spending and savings statistics')
        ),
    async execute(interaction) {
        console.log('budget command entrypoint');
        let db = await interaction.client.localDB;
        let discordId = interaction.member.id;
        console.log(db, discordId);
        let allowed = ['372115788498468864', '222457277708369928'].includes(discordId);
        console.log(allowed);
        if (!allowed) {
            console.log('budget command denied');
            await interaction.reply('This command may only be invoked by Miffy!');
            return;
        }
        console.log(`Switcching on sub ${interaction.options.getSubcommand()}`);
        switch (interaction.options.getSubcommand()) {
            case 'set':
                console.log('budget command set');
                let override = interaction.options.getBoolean('override') ?? false;
                let budget = interaction.options.get('amount').value;
                db.prepare(`INSERT OR REPLACE INTO bot_config (id, weekly_budget) VALUES (1, ?)`).run(budget);
                if (override) {
                    db.prepare(`
                        UPDATE weekly_budgets 
                        SET budget_amount = ?
                        WHERE id = (
                            SELECT id FROM weekly_budgets 
                            WHERE date('now', 'localtime') BETWEEN start_date AND end_date
                            ORDER BY id DESC
                            LIMIT 1
                        )`).run(budget);

                }
                await interaction.reply(`Budget set to ${Number(budget).toFixed(2)}.`);
                break;
            case 'view':
                const currentBudget = db.prepare(`
                    SELECT id, budget_amount, exchange_rate, start_date, end_date 
                    FROM weekly_budgets 
                    WHERE date('now', 'localtime') BETWEEN start_date AND end_date
                    LIMIT 1
                `).get();

                const userSpendings = db.prepare(`
                    SELECT amount, message_raw 
                    FROM grocery_spendings 
                    WHERE budget_id = ? AND discord_id = ?
                `).all(currentBudget.id, interaction.member.id);

                const totalSpentEur = userSpendings.reduce((acc, s) => {
                    return acc + s.amount;
                }, 0);

                const remainingEur = currentBudget.budget_amount - totalSpentEur;
                const remainingSek = remainingEur * currentBudget.exchange_rate;

                const todayTimestamp = Math.floor(Date.now() / 1000);
                const endTimestamp = Math.floor(new Date(`${currentBudget.end_date}T23:59:59`).getTime() / 1000);

                const budgetEmbed = new EmbedBuilder()
                    .setColor(remainingEur > 0 ? 0x00ff00 : 0xff0000)
                    .setTitle(`${interaction.member.displayName} Budget as of <t:${todayTimestamp}:F>`)
                    .setDescription(`Period: \`${currentBudget.start_date}\` to \`${currentBudget.end_date}\`\nReset <t:${endTimestamp}:R>`)
                    .addFields(
                        { name: 'Spent', value: `${totalSpentEur.toFixed(2)} €\n${(totalSpentEur * currentBudget.exchange_rate).toFixed(2)} kr`, inline: true },
                        { name: 'Remaining', value: `${remainingEur.toFixed(2)} €\n${remainingSek.toFixed(2)} kr`, inline: true },
                    )
                    .setFooter({ text: `Exchange rate this week: 1 € = ${currentBudget.exchange_rate.toFixed(2)} kr` })
                    .setTimestamp();

                await interaction.reply({ embeds: [budgetEmbed] });
                break
            case 'stats':
                const allBudgets = db.prepare(`
                    SELECT id, budget_amount, exchange_rate, start_date, end_date 
                    FROM weekly_budgets 
                    ORDER BY start_date DESC
                    LIMIT 4
                `).all();

                let statsDescription = "";
                let cumulativeSavingsEur = 0;

                for (const budgetPeriod of allBudgets) {
                    const periodSpendings = db.prepare(`
                        SELECT amount 
                        FROM grocery_spendings 
                        WHERE budget_id = ? AND discord_id = ?
                    `).all(budgetPeriod.id, interaction.member.id);

                    const totalSpentInPeriodEur = periodSpendings.reduce((acc, s) => acc + s.amount, 0);
                    const savedInPeriodEur = budgetPeriod.budget_amount - totalSpentInPeriodEur;
                    cumulativeSavingsEur += savedInPeriodEur;

                    statsDescription += `**Period: ${budgetPeriod.start_date} - ${budgetPeriod.end_date}**\n`;
                    statsDescription += `Budget: ${budgetPeriod.budget_amount.toFixed(2)}€\n`;
                    statsDescription += `Spent: ${totalSpentInPeriodEur.toFixed(2)}€ (${(totalSpentInPeriodEur * budgetPeriod.exchange_rate).toFixed(2)} kr)\n`;
                    statsDescription += `Saved: ${savedInPeriodEur.toFixed(2)}€ (${(savedInPeriodEur * budgetPeriod.exchange_rate).toFixed(2)} kr)\n`;
                    statsDescription += `Cumulative: ${cumulativeSavingsEur.toFixed(2)}€\n\n`;
                }

                if (allBudgets.length === 0) {
                    statsDescription = "No budget periods on record.";
                }

                const statsEmbed = new EmbedBuilder()
                    .setColor(0x0099ff)
                    .setTitle(`${interaction.member.displayName}'s Budget Statistics`)
                    .setDescription(statsDescription)
                    .setTimestamp();

                await interaction.reply({ embeds: [statsEmbed] });
                break;
            default:
                await interaction.reply(`Sub mismatch. Switching on ${interaction.options.getSubcommand()}`);
                break;
        }
    },
};