/**
 * Equipment Rendering Module
 * Handles UI rendering for the equipment grid and item creation
 */

import { extensionSettings, $equipmentContainer } from '../../core/state.js';
import { i18n } from '../../core/i18n.js';
import { EQUIPMENT_CATEGORIES, SLOTS_LIST, escapeHtml } from '../equipment/constants.js';

/**
 * Renders a single equipment slot
 * @param {Object} slotDef - Slot definition from SLOTS_LIST
 * @param {Object|null} item - The equipped item or null
 * @returns {string} HTML for the slot
 */
function renderSlot(slotDef, item) {
    const slotId = slotDef.id;
    const slotName = i18n.getTranslation(`equipment.slots.${slotId}`) || slotId.replace(/(\d+)/, ' $1');
    const equippedClass = item ? 'equipped' : '';

    if (item) {
        const statsText = Object.entries(item.stats || {})
            .filter(([_, val]) => val > 0)
            .map(([key, val]) => `<span class="rpg-eq-stat"><span class="rpg-eq-stat-label">${escapeHtml(key.toUpperCase())}</span><span class="rpg-eq-stat-value">+${val}</span></span>`)
            .join('');

        return `
            <div class="rpg-equipment-slot ${equippedClass}" data-slot="${slotId}" data-item-id="${item.id}">
                <div class="rpg-equipment-slot-header">
                    <i class="fa-solid ${slotDef.icon}"></i>
                    <span class="rpg-equipment-slot-name">${escapeHtml(slotName)}</span>
                    <button class="rpg-equipment-unequip-btn" data-action="unequip" title="${i18n.getTranslation('equipment.unequip') || 'Unequip'}">
                        <i class="fa-solid fa-times"></i>
                    </button>
                </div>
                <div class="rpg-equipment-item-name">${escapeHtml(item.name)}</div>
                ${statsText ? `<div class="rpg-equipment-stats">${statsText}</div>` : ''}
                ${item.description ? `<div class="rpg-equipment-description">${escapeHtml(item.description)}</div>` : ''}
                <div class="rpg-equipment-item-actions">
                    <button class="rpg-equipment-edit-btn" data-action="edit-item" data-item-id="${item.id}" title="${i18n.getTranslation('equipment.editItem') || 'Edit item'}">
                        <i class="fa-solid fa-pen"></i>
                    </button>
                    <button class="rpg-equipment-delete-btn" data-action="delete-item" data-item-id="${item.id}" title="${i18n.getTranslation('equipment.deleteItem') || 'Delete item'}">
                        <i class="fa-solid fa-trash"></i>
                    </button>
                </div>
            </div>
        `;
    }

    return `
        <div class="rpg-equipment-slot" data-slot="${slotId}">
            <div class="rpg-equipment-slot-header">
                <i class="fa-solid ${slotDef.icon}"></i>
                <span class="rpg-equipment-slot-name">${escapeHtml(slotName)}</span>
            </div>
            <div class="rpg-equipment-empty">${i18n.getTranslation('equipment.emptySlot') || 'Empty'}</div>
        </div>
    `;
}

/**
 * Generates the full equipment section HTML
 * @returns {string} Complete HTML for the equipment section
 */
function generateEquipmentHTML() {
    const equipment = extensionSettings.userStats?.equipment || { items: [], slots: {} };
    const slots = equipment.slots || {};
    const items = equipment.items || [];

    let html = '<div class="rpg-equipment-container">';

    // Header with add button
    html += `
        <div class="rpg-equipment-header">
            <h3>
                <i class="fa-solid fa-shield-halved"></i>
                <span data-i18n-key="equipment.title">${i18n.getTranslation('equipment.title') || 'Equipment'}</span>
            </h3>
            <button class="rpg-equipment-add-btn" data-action="show-create-modal" title="${i18n.getTranslation('equipment.createItem') || 'Create new equipment'}">
                <i class="fa-solid fa-plus"></i> ${i18n.getTranslation('equipment.createItem') || 'Create Equipment'}
            </button>
        </div>
    `;

    // Equipment grid
    html += '<div class="rpg-equipment-grid">';

    // Render each slot
    for (const slotDef of SLOTS_LIST) {
        const item = items.find(i => i.slot === slotDef.id);
        html += renderSlot(slotDef, item);
    }

    html += '</div>';

    // Inventory list (items not currently equipped)
    const unequipped = items.filter(item => !item.slot);
    if (unequipped.length > 0) {
        html += '<div class="rpg-equipment-inventory">';
        html += `<h4>${i18n.getTranslation('equipment.inventoryTitle') || 'Inventory'}</h4>`;
        html += '<div class="rpg-equipment-inventory-list">';

        for (const item of unequipped) {
            const category = EQUIPMENT_CATEGORIES[item.type];
            const statsText = Object.entries(item.stats || {})
                .filter(([_, val]) => val > 0)
                .map(([key, val]) => `<span class="rpg-eq-stat"><span class="rpg-eq-stat-label">${escapeHtml(key.toUpperCase())}</span><span class="rpg-eq-stat-value">+${val}</span></span>`)
                .join('');

            html += `
                <div class="rpg-equipment-inventory-item" data-item-id="${item.id}">
                    <div class="rpg-equipment-inventory-item-header">
                        <i class="fa-solid ${category ? category.icon : 'fa-circle'}"></i>
                        <span class="rpg-equipment-inventory-item-name">${escapeHtml(item.name)}</span>
                        <span class="rpg-equipment-inventory-item-type">${category ? (i18n.getTranslation(`equipment.types.${item.type}`) || item.type) : escapeHtml(item.type)}</span>
                    </div>
                    ${statsText ? `<div class="rpg-equipment-stats">${statsText}</div>` : ''}
                    <div class="rpg-equipment-item-actions">
                        <button class="rpg-equipment-equip-btn" data-action="equip" data-item-id="${item.id}" title="${i18n.getTranslation('equipment.equip') || 'Equip'}">
                            <i class="fa-solid fa-hand"></i>
                        </button>
                        <button class="rpg-equipment-edit-btn" data-action="edit-item" data-item-id="${item.id}" title="${i18n.getTranslation('equipment.editItem') || 'Edit item'}">
                            <i class="fa-solid fa-pen"></i>
                        </button>
                        <button class="rpg-equipment-delete-btn" data-action="delete-item" data-item-id="${item.id}" title="${i18n.getTranslation('equipment.deleteItem') || 'Delete item'}">
                            <i class="fa-solid fa-trash"></i>
                        </button>
                    </div>
                </div>
            `;
        }

        html += '</div>';
        html += '</div>';
    }

    html += '</div>';

    return html;
}

/**
 * Main equipment rendering function
 * Gets data from state/settings and updates DOM directly.
 */
export function renderEquipment() {
    if (!$equipmentContainer || !extensionSettings.showEquipment) {
        return;
    }

    const html = generateEquipmentHTML();
    $equipmentContainer.html(html);

    // Re-apply translations
    i18n.applyTranslations($equipmentContainer[0]);
}