import { _fs } from 'fs';
import { _path } from 'path';

import { _MessageFlags } from 'discord-api-types/v10';
import { SlashCommandBuilder, PermissionFlagsBits, ModalBuilder, TextInputBuilder, TextInputStyle, ActionRowBuilder } from 'discord.js';
// Placeholder info for template variables
const TEMPLATE_KEYS_INFO = 'Available keys: userName, userId, locationName, locationId, date, time, datetime, clientId';

// Modal text input limits
const MAX_LEN = 4000;
const MAX_FIELDS = 5;

/**
 * responsesPrompt module
 * Implements `/prompt [version]` to edit the current or historical prompt in a single PocketBase collection.
 * responses_prompts collection holds all versions; newest record per client is the live prompt.
 */
export const commands = [
    {
        data: new SlashCommandBuilder()
            .setName('prompt')
            .setDescription('Edit the AI response prompt (current or past version)')
            .setDefaultMemberPermissions(PermissionFlagsBits.Administrator)
            .setDMPermission(false)
            .addStringOption(opt =>
                opt.setName('version')
                    .setDescription('ID of a past prompt version to load')
                    .setRequired(false)
                    .setAutocomplete(true)
            ),
        async execute(interaction, client) {
            const _clientId = client.config.id;
            const versionId = interaction.options.getString('version');
            // Fetch prompt: live latest or selected historic
            let promptText = client.responsesPrompt || '';
            if (versionId) {
                try {
                    const rec = await client.pb.getOne('responses_prompts', versionId);
                    if (rec?.prompt) promptText = rec.prompt;
                } catch (err) {
                    client.logger.error(`Failed to load prompt version ${versionId}: ${err.message}`);
                }
            }
            // Prepare modal fields: one SHORT help, then paragraph chunks
            // Help field
            const helpField = new TextInputBuilder()
                .setCustomId('template_help')
                .setLabel('Template variables (no edits)')
                .setStyle(TextInputStyle.Short)
                .setRequired(false)
            // prefill with the list of usable keys
                .setValue(TEMPLATE_KEYS_INFO);
            const modal = new ModalBuilder()
                .setCustomId(`promptModal-${versionId || 'current'}`)
                .setTitle('Edit AI Prompt')
                .addComponents(new ActionRowBuilder().addComponents(helpField));
            // Prompt chunks
            const chunks = [];
            for (let off = 0; off < promptText.length && chunks.length < MAX_FIELDS - 1; off += MAX_LEN) {
                chunks.push(promptText.slice(off, off + MAX_LEN));
            }
            chunks.forEach((text, idx) => {
                const input = new TextInputBuilder()
                    .setCustomId(`prompt_${idx}`)
                    .setLabel(`Part ${idx + 1}`)
                    .setStyle(TextInputStyle.Paragraph)
                    .setRequired(idx === 0)
                    .setMaxLength(MAX_LEN)
                    .setValue(text);
                modal.addComponents(new ActionRowBuilder().addComponents(input));
            });
            // Empty fields to fill out to MAX_FIELDS
            for (let i = chunks.length; i < MAX_FIELDS - 1; i++) {
                modal.addComponents(new ActionRowBuilder().addComponents(
                    new TextInputBuilder()
                        .setCustomId(`prompt_${i}`)
                        .setLabel(`Part ${i + 1}`)
                        .setStyle(TextInputStyle.Paragraph)
                        .setRequired(false)
                        .setMaxLength(MAX_LEN)
                ));
            }
            await interaction.showModal(modal);
        }
    }
];

// Store clients for event hooks
const _clients = [];

export async function init(client, clientConfig) {
    const _clientId = client.config.id;
    client.logger.info('[module:responsesPrompt] initialized');
    // Load live prompt (latest version)
    try {
        const { items } = await client.pb.collection('responses_prompts')
            .getList(1, 1, { filter: `clientId="${_clientId}"`, sort: '-created' });
        client.responsesPrompt = items[0]?.prompt || '';
    } catch (err) {
        client.logger.error(`Error loading current prompt: ${err.message}`);
        client.responsesPrompt = '';
    }
    _clients.push({ client, clientConfig });
    // Autocomplete versions
    client.on('interactionCreate', async interaction => {
        if (!interaction.isAutocomplete() || interaction.commandName !== 'prompt') return;
        const focused = interaction.options.getFocused(true);
        if (focused.name === 'version') {
            try {
                const { items } = await client.pb.collection('responses_prompts')
                    .getList(1, 25, { filter: `clientId="${_clientId}"`, sort: '-created' });
                const choices = items.map(r => ({ name: new Date(r.created).toLocaleString(), value: r.id }));
                await interaction.respond(choices);
            } catch (err) {
                client.logger.error(`Prompt autocomplete error: ${err.message}`);
                await interaction.respond([]);
            }
        }
    });
    // Modal submission: save new version & prune old
    client.on('interactionCreate', async interaction => {
        if (!interaction.isModalSubmit()) return;
        const id = interaction.customId;
        if (!id.startsWith('promptModal-')) return;
        const parts = [];
        for (let i = 0; i < MAX_FIELDS; i++) {
            try {
                const v = interaction.fields.getTextInputValue(`prompt_${i}`) || '';
                if (v.trim()) parts.push(v);
            } catch {}
        }
        const newPrompt = parts.join('\n');
        // Persist new version
        let _newRec;
        try {
            _newRec = await client.pb.createOne('responses_prompts', { clientId: _clientId, prompt: newPrompt, updatedBy: interaction.user.id });
            client.responsesPrompt = newPrompt;
        } catch (err) {
            client.logger.error(`Failed to save prompt: ${err.message}`);
            return interaction.reply({ content: `Error saving prompt: ${err.message}`, ephemeral: true });
        }
        // Prune older versions beyond the 10 most recent
        try {
            const { items } = await client.pb.collection('responses_prompts')
                .getList(1, 100, { filter: `clientId="${_clientId}"`, sort: '-created' });
            const toDelete = items.map(r => r.id).slice(10);
            for (const id of toDelete) {
                await client.pb.deleteOne('responses_prompts', id);
            }
        } catch (err) {
            client.logger.error(`Failed to prune old prompts: ${err.message}`);
        }
        await interaction.reply({ content: 'Prompt saved!', ephemeral: true });
    });
}