/***********************************************************************************************************************************************************************
 * File Name: plan_prices.controller.js  (admin)
 * Type of Program: Controller
 * Description: Admin CRUD for localized price overrides per tier plan.
 *              Routes: GET/POST/PUT/DELETE /admin/tiers/:id/prices[/:currency]
 * Author: Kenneth Obsequio (@lash0000)
 * Date Created: Jun. 29, 2026
 ***********************************************************************************************************************************************************************/
'use strict';

const mdl_TierPlans  = require('../../models/tiers/tier_plans.mdl');
const mdl_PlanPrices = require('../../models/tiers/plan_prices.mdl');
const R              = require('../../utils/response.util');
const logActivity    = require('../../utils/logActivity.util');
const { isSupported, SUPPORTED_CURRENCIES, validateLocalizedPrice } = require('../../utils/currency.util');

// ─── GET /admin/tiers/:id/prices ─────────────────────────────────────────────

exports.getPrices = async (req, res) => {
  try {
    const plan = await mdl_TierPlans.findByPk(req.params.id);
    if (!plan) return R.error(res, 'Plan not found.', 404);

    const prices = await mdl_PlanPrices.findAll({
      where: { plan_id: plan.plan_id },
      order: [['currency', 'ASC']],
    });

    return R.success(res, 'Localized prices retrieved.', prices);
  } catch (err) {
    console.error('[ADMIN][GET PLAN PRICES]', err);
    return R.error(res, 'Could not retrieve localized prices.', 500);
  }
};

// ─── POST /admin/tiers/:id/prices ────────────────────────────────────────────

exports.addPrice = async (req, res) => {
  try {
    const plan = await mdl_TierPlans.findByPk(req.params.id);
    if (!plan) return R.error(res, 'Plan not found.', 404);

    const { currency, price } = req.body;
    if (!currency || price === undefined) return R.error(res, 'currency and price are required.', 400);
    if (!isSupported(currency))           return R.error(res, `Unsupported currency: ${currency}.`, 400);
    if (currency === plan.currency)       return R.error(res, `${currency} is already the plan's base currency.`, 400);
    if (Number(price) < 0)               return R.error(res, 'Price must be 0 or greater.', 400);

    const exists = await mdl_PlanPrices.findOne({ where: { plan_id: plan.plan_id, currency } });
    if (exists) return R.error(res, `A localized price for ${currency} already exists. Use PUT to update it.`, 409);

    // ── Rate validation ────────────────────────────────────────────────────────
    const validation = await validateLocalizedPrice(plan.price, plan.currency, price, currency);
    if (validation.zone === 'block') return R.error(res, validation.message, 422);

    const entry = await mdl_PlanPrices.create({
      plan_id:  plan.plan_id,
      currency: currency.toUpperCase(),
      price:    Number(price),
    });

    logActivity(req.user?.user_id, 'add_plan_price', {
      entityType: 'plan_price',
      details: { plan_id: plan.plan_id, currency, price },
    });

    if (validation.zone === 'warn')
      return res.status(201).json({ success: true, warning: true, message: validation.message, data: entry });

    return R.success(res, 'Localized price added.', entry, 201);
  } catch (err) {
    console.error('[ADMIN][ADD PLAN PRICE]', err);
    return R.error(res, 'Could not add localized price.', 500);
  }
};

// ─── PUT /admin/tiers/:id/prices/:currency ───────────────────────────────────

exports.updatePrice = async (req, res) => {
  try {
    const { id, currency } = req.params;
    const { price }        = req.body;

    if (price === undefined)  return R.error(res, 'price is required.', 400);
    if (Number(price) < 0)   return R.error(res, 'Price must be 0 or greater.', 400);

    const entry = await mdl_PlanPrices.findOne({ where: { plan_id: id, currency: currency.toUpperCase() } });
    if (!entry) return R.error(res, `No localized price found for ${currency} on this plan.`, 404);

    // ── Rate validation ────────────────────────────────────────────────────────
    const plan       = await mdl_TierPlans.findByPk(id);
    const validation = await validateLocalizedPrice(plan.price, plan.currency, price, currency);
    if (validation.zone === 'block') return R.error(res, validation.message, 422);

    await entry.update({ price: Number(price) });

    logActivity(req.user?.user_id, 'update_plan_price', {
      entityType: 'plan_price',
      details: { plan_id: id, currency, price },
    });

    if (validation.zone === 'warn')
      return res.status(200).json({ success: true, warning: true, message: validation.message, data: entry });

    return R.success(res, 'Localized price updated.', entry);
  } catch (err) {
    console.error('[ADMIN][UPDATE PLAN PRICE]', err);
    return R.error(res, 'Could not update localized price.', 500);
  }
};

// ─── DELETE /admin/tiers/:id/prices/:currency ────────────────────────────────

exports.removePrice = async (req, res) => {
  try {
    const { id, currency } = req.params;

    const entry = await mdl_PlanPrices.findOne({ where: { plan_id: id, currency: currency.toUpperCase() } });
    if (!entry) return R.error(res, `No localized price found for ${currency} on this plan.`, 404);

    await entry.destroy();

    logActivity(req.user?.user_id, 'remove_plan_price', {
      entityType: 'plan_price',
      details: { plan_id: id, currency },
    });

    return R.success(res, 'Localized price removed.');
  } catch (err) {
    console.error('[ADMIN][REMOVE PLAN PRICE]', err);
    return R.error(res, 'Could not remove localized price.', 500);
  }
};

// ─── GET /admin/currencies ────────────────────────────────────────────────────

exports.getCurrencies = async (_req, res) => {
  return R.success(res, 'Supported currencies retrieved.', SUPPORTED_CURRENCIES);
};