import React, { useState } from 'react';
import { getItemEmoji } from '../utils/itemUtils';
import './ItemIcon.css';

// All textures are proxied & cached through our server
const TEXTURE_PROXY_BASE = '/api/texture';

// Items whose texture file name differs from their registry name
const TEXTURE_ALIASES = {
  // Renamed items in 1.20+
  grass: 'short_grass',
  scute: 'turtle_scute',
};

// CC:Tweaked texture paths (registry name → actual file in the CC repo)
const CC_TEXTURE_MAP = {
  turtle_normal: 'block/turtle_normal_front',
  turtle_advanced: 'block/turtle_advanced_front',
  computer_normal: 'block/computer_normal_front',
  computer_advanced: 'block/computer_advanced_front',
  computer_command: 'block/computer_command_front',
  monitor_normal: 'block/monitor_normal_0',
  monitor_advanced: 'block/monitor_advanced_0',
  wired_modem: 'block/wired_modem_face',
  wired_modem_full: 'block/wired_modem_face',
  wireless_modem_normal: 'block/wireless_modem_normal_face',
  wireless_modem_advanced: 'block/wireless_modem_advanced_face',
  speaker: 'block/speaker_front',
  disk_drive: 'block/disk_drive_front',
  printer: 'block/printer_front_empty',
  cable: 'block/cable_core',
  // CC item textures
  pocket_computer_normal: 'item/pocket_computer_normal',
  pocket_computer_advanced: 'item/pocket_computer_advanced',
  disk: 'item/disk_frame',
  printed_book: 'item/printed_book',
  printed_page: 'item/printed_page',
  printed_pages: 'item/printed_pages',
};

// Items whose texture lives in the block/ folder instead of item/
const BLOCK_TEXTURES = new Set([
  'stone', 'granite', 'polished_granite', 'diorite', 'polished_diorite', 'andesite',
  'polished_andesite', 'cobblestone', 'oak_planks', 'spruce_planks', 'birch_planks',
  'jungle_planks', 'acacia_planks', 'dark_oak_planks', 'mangrove_planks', 'cherry_planks',
  'bamboo_planks', 'crimson_planks', 'warped_planks', 'oak_log', 'spruce_log', 'birch_log',
  'jungle_log', 'acacia_log', 'dark_oak_log', 'mangrove_log', 'cherry_log', 'bamboo_block',
  'stripped_oak_log', 'stripped_spruce_log', 'stripped_birch_log', 'stripped_jungle_log',
  'stripped_acacia_log', 'stripped_dark_oak_log', 'stripped_mangrove_log', 'stripped_cherry_log',
  'sand', 'red_sand', 'gravel', 'dirt', 'coarse_dirt', 'rooted_dirt', 'mud',
  'cobblestone', 'mossy_cobblestone', 'obsidian', 'crying_obsidian',
  'netherrack', 'soul_sand', 'soul_soil', 'basalt', 'polished_basalt', 'smooth_basalt',
  'glowstone', 'glass', 'tinted_glass',

  'bricks', 'stone_bricks', 'mossy_stone_bricks', 'cracked_stone_bricks',
  'chiseled_stone_bricks', 'deepslate_bricks', 'nether_bricks', 'red_nether_bricks',
  'bookshelf', 'clay', 'pumpkin', 'carved_pumpkin', 'jack_o_lantern', 'melon',
  'sponge', 'wet_sponge', 'sandstone', 'red_sandstone', 'prismarine', 'dark_prismarine',
  'sea_lantern', 'hay_block', 'terracotta', 'packed_ice', 'blue_ice',
  'snow_block', 'ice', 'mycelium', 'podzol', 'grass_block', 'moss_block',
  'deepslate', 'cobbled_deepslate', 'polished_deepslate', 'calcite', 'tuff', 'dripstone_block',
  'coal_ore', 'iron_ore', 'gold_ore', 'diamond_ore', 'emerald_ore', 'lapis_ore', 'redstone_ore',
  'copper_ore', 'nether_gold_ore', 'nether_quartz_ore', 'ancient_debris',
  'deepslate_coal_ore', 'deepslate_iron_ore', 'deepslate_gold_ore', 'deepslate_diamond_ore',
  'deepslate_emerald_ore', 'deepslate_lapis_ore', 'deepslate_redstone_ore', 'deepslate_copper_ore',
  'coal_block', 'iron_block', 'gold_block', 'diamond_block', 'emerald_block',
  'lapis_block', 'redstone_block', 'copper_block', 'raw_iron_block', 'raw_gold_block',
  'raw_copper_block', 'netherite_block', 'amethyst_block', 'quartz_block',
  'tnt', 'end_stone', 'end_stone_bricks', 'purpur_block', 'purpur_pillar',
  'magma_block', 'bone_block', 'dried_kelp_block', 'honeycomb_block',
  'slime_block', 'honey_block', 'note_block', 'jukebox',
  'white_wool', 'orange_wool', 'magenta_wool', 'light_blue_wool', 'yellow_wool',
  'lime_wool', 'pink_wool', 'gray_wool', 'light_gray_wool', 'cyan_wool',
  'purple_wool', 'blue_wool', 'brown_wool', 'green_wool', 'red_wool', 'black_wool',
  'white_concrete', 'orange_concrete', 'magenta_concrete', 'light_blue_concrete',
  'yellow_concrete', 'lime_concrete', 'pink_concrete', 'gray_concrete',
  'light_gray_concrete', 'cyan_concrete', 'purple_concrete', 'blue_concrete',
  'brown_concrete', 'green_concrete', 'red_concrete', 'black_concrete',
  'white_terracotta', 'orange_terracotta', 'magenta_terracotta', 'light_blue_terracotta',
  'yellow_terracotta', 'lime_terracotta', 'pink_terracotta', 'gray_terracotta',
  'light_gray_terracotta', 'cyan_terracotta', 'purple_terracotta', 'blue_terracotta',
  'brown_terracotta', 'green_terracotta', 'red_terracotta', 'black_terracotta',
  'white_glazed_terracotta', 'orange_glazed_terracotta', 'magenta_glazed_terracotta',
  'light_blue_glazed_terracotta', 'yellow_glazed_terracotta', 'lime_glazed_terracotta',
  'pink_glazed_terracotta', 'gray_glazed_terracotta', 'light_gray_glazed_terracotta',
  'cyan_glazed_terracotta', 'purple_glazed_terracotta', 'blue_glazed_terracotta',
  'brown_glazed_terracotta', 'green_glazed_terracotta', 'red_glazed_terracotta',
  'black_glazed_terracotta',
  'white_stained_glass', 'orange_stained_glass', 'magenta_stained_glass',
  'light_blue_stained_glass', 'yellow_stained_glass', 'lime_stained_glass',
  'pink_stained_glass', 'gray_stained_glass', 'light_gray_stained_glass',
  'cyan_stained_glass', 'purple_stained_glass', 'blue_stained_glass',
  'brown_stained_glass', 'green_stained_glass', 'red_stained_glass',
  'black_stained_glass',
  'crafting_table', 'furnace', 'blast_furnace', 'smoker', 'smithing_table',
  'fletching_table', 'cartography_table', 'loom', 'stonecutter', 'grindstone',
  'anvil', 'chipped_anvil', 'damaged_anvil', 'enchanting_table',
  'brewing_stand', 'cauldron', 'composter', 'barrel',
  'shulker_box', 'dispenser', 'dropper', 'hopper', 'observer',
  'piston', 'sticky_piston', 'redstone_lamp', 'target', 'lever',
  'beacon', 'conduit', 'lodestone', 'respawn_anchor',
  'cactus', 'sugar_cane', 'bamboo',
  'mushroom_stem', 'brown_mushroom_block', 'red_mushroom_block',
  'oak_leaves', 'spruce_leaves', 'birch_leaves', 'jungle_leaves',
  'acacia_leaves', 'dark_oak_leaves', 'mangrove_leaves', 'cherry_leaves', 'azalea_leaves',
  // Additional blocks commonly seen as items
  'smooth_stone', 'smooth_sandstone', 'smooth_red_sandstone', 'smooth_quartz',
  'chiseled_sandstone', 'cut_sandstone', 'chiseled_red_sandstone', 'cut_red_sandstone',
  'quartz_pillar', 'chiseled_quartz_block', 'quartz_bricks',
  'ladder', 'cobweb', 'torch', 'soul_torch', 'lantern', 'soul_lantern',
  'redstone_torch', 'chain',
  'rail', 'powered_rail', 'detector_rail', 'activator_rail',
  'brown_mushroom', 'red_mushroom',
  'oak_sapling', 'spruce_sapling', 'birch_sapling', 'jungle_sapling',
  'acacia_sapling', 'dark_oak_sapling', 'cherry_sapling',
  'dandelion', 'poppy', 'blue_orchid', 'allium', 'azure_bluet',
  'red_tulip', 'orange_tulip', 'white_tulip', 'pink_tulip',
  'oxeye_daisy', 'cornflower', 'lily_of_the_valley', 'sunflower',
  'lilac', 'rose_bush', 'peony', 'wither_rose', 'torchflower',
  'dead_bush', 'fern', 'short_grass', 'tall_grass', 'large_fern',
  'vine', 'lily_pad', 'seagrass', 'kelp', 'hanging_roots', 'spore_blossom',
  'tube_coral', 'brain_coral', 'bubble_coral', 'fire_coral', 'horn_coral',
  'tube_coral_block', 'brain_coral_block', 'bubble_coral_block', 'fire_coral_block', 'horn_coral_block',
  'tube_coral_fan', 'brain_coral_fan', 'bubble_coral_fan', 'fire_coral_fan', 'horn_coral_fan',
  'white_concrete_powder', 'orange_concrete_powder', 'magenta_concrete_powder',
  'light_blue_concrete_powder', 'yellow_concrete_powder', 'lime_concrete_powder',
  'pink_concrete_powder', 'gray_concrete_powder', 'light_gray_concrete_powder',
  'cyan_concrete_powder', 'purple_concrete_powder', 'blue_concrete_powder',
  'brown_concrete_powder', 'green_concrete_powder', 'red_concrete_powder', 'black_concrete_powder',
  'sculk', 'sculk_catalyst', 'sculk_shrieker', 'sculk_sensor', 'sculk_vein',
  'mud_bricks', 'packed_mud', 'muddy_mangrove_roots',
  'crimson_stem', 'warped_stem', 'stripped_crimson_stem', 'stripped_warped_stem',
  'crimson_nylium', 'warped_nylium', 'shroomlight', 'nether_wart_block', 'warped_wart_block',
  'crying_obsidian', 'blackstone', 'polished_blackstone', 'polished_blackstone_bricks',
  'chiseled_polished_blackstone', 'gilded_blackstone', 'cracked_polished_blackstone_bricks',
  'lodestone', 'respawn_anchor',
  'pointed_dripstone', 'moss_carpet', 'azalea', 'flowering_azalea',
  'powder_snow', 'mangrove_roots',
  'copper_block', 'exposed_copper', 'weathered_copper', 'oxidized_copper',
  'cut_copper', 'exposed_cut_copper', 'weathered_cut_copper', 'oxidized_cut_copper',
  'waxed_copper_block', 'waxed_exposed_copper', 'waxed_weathered_copper', 'waxed_oxidized_copper',
]);

// Some blocks need a specific texture suffix (e.g. furnace_front, oak_log_top)
// We use _front, _top, or _side variants for recognizable look
const BLOCK_TEXTURE_SUFFIXES = {
  furnace: '_front',
  blast_furnace: '_front',
  smoker: '_front',
  dispenser: '_front',
  dropper: '_front',
  observer: '_front',
  piston: '_top',
  sticky_piston: '_top',
  barrel: '_top',
  crafting_table: '_top',
  cartography_table: '_top',
  fletching_table: '_top',
  smithing_table: '_top',
  grass_block: '_top',
  mycelium: '_top',
  podzol: '_top',
  pumpkin: '_side',
  carved_pumpkin: '_front',
  jack_o_lantern: '_front',
  jukebox: '_top',
  loom: '_front',
  bee_nest: '_front',
  beehive: '_front',
  respawn_anchor: '_top',
  bone_block: '_side',
  basalt: '_side',
  polished_basalt: '_side',
  quartz_pillar: '_side',
  purpur_pillar: '_side',
  tnt: '_side',
  composter: '_side',
  enchanting_table: '_top',
};

// Resolve derivative blocks (stairs, slabs, fences, walls, buttons) to parent block texture
const WOOD_TYPES = new Set([
  'oak', 'spruce', 'birch', 'jungle', 'acacia', 'dark_oak',
  'mangrove', 'cherry', 'bamboo', 'crimson', 'warped',
]);
const STONE_ALIASES = {
  brick: 'bricks', stone_brick: 'stone_bricks', mossy_stone_brick: 'mossy_stone_bricks',
  nether_brick: 'nether_bricks', red_nether_brick: 'red_nether_bricks',
  end_stone_brick: 'end_stone_bricks', deepslate_brick: 'deepslate_bricks',
  deepslate_tile: 'deepslate_tiles', polished_blackstone_brick: 'polished_blackstone_bricks',
  mud_brick: 'mud_bricks', quartz: 'quartz_block', purpur: 'purpur_block',
  smooth_stone: 'smooth_stone',
};

function resolveDerivativeTexture(name) {
  const suffixes = ['_stairs', '_slab', '_fence_gate', '_fence', '_wall', '_button', '_pressure_plate'];
  for (const suffix of suffixes) {
    if (!name.endsWith(suffix)) continue;
    const base = name.slice(0, -suffix.length);
    if (BLOCK_TEXTURES.has(base)) return base;
    if (WOOD_TYPES.has(base)) return `${base}_planks`;
    if (STONE_ALIASES[base]) return STONE_ALIASES[base];
    return null;
  }
  return null;
}

/**
 * Generate texture URLs to try in order.
 * - CC:Tweaked → curated texture map (1 request)
 * - Create → item/ then block/ (2 requests max)
 * - Unknown mods → empty (instant emoji, no wasted requests)
 * - Vanilla derivatives → parent block texture (1 request)
 * - Vanilla → block/ or item/ with fallback
 */
function getTextureUrls(fullItemName) {
  const colonIdx = (fullItemName || '').indexOf(':');
  const namespace = colonIdx >= 0 ? fullItemName.substring(0, colonIdx) : 'minecraft';
  const shortName = colonIdx >= 0 ? fullItemName.substring(colonIdx + 1) : fullItemName;
  const urls = [];

  // CC:Tweaked → use curated texture map
  if (namespace === 'computercraft') {
    const mapped = CC_TEXTURE_MAP[shortName];
    if (mapped) {
      urls.push(`${TEXTURE_PROXY_BASE}/computercraft/${mapped}.png`);
    } else {
      urls.push(`${TEXTURE_PROXY_BASE}/computercraft/item/${shortName}.png`);
      urls.push(`${TEXTURE_PROXY_BASE}/computercraft/block/${shortName}.png`);
    }
    return urls;
  }

  // Create mod → item/ then block/
  if (namespace === 'create') {
    urls.push(`${TEXTURE_PROXY_BASE}/create/item/${shortName}.png`);
    urls.push(`${TEXTURE_PROXY_BASE}/create/block/${shortName}.png`);
    return urls;
  }

  // Unknown mod namespace → no textures available, instant emoji fallback
  if (namespace !== 'minecraft') {
    return urls;
  }

  // === Vanilla (minecraft) ===
  const alias = TEXTURE_ALIASES[shortName] || shortName;

  // Derivative blocks (stairs, slabs, fences, walls, buttons) → parent texture
  const parent = resolveDerivativeTexture(alias);
  if (parent) {
    const suffix = BLOCK_TEXTURE_SUFFIXES[parent] || '';
    urls.push(`${TEXTURE_PROXY_BASE}/minecraft/block/${parent}${suffix}.png`);
    return urls;
  }

  // Known block → try block/ first (with suffix if applicable)
  if (BLOCK_TEXTURES.has(alias)) {
    const suffix = BLOCK_TEXTURE_SUFFIXES[alias] || '';
    urls.push(`${TEXTURE_PROXY_BASE}/minecraft/block/${alias}${suffix}.png`);
    if (suffix) urls.push(`${TEXTURE_PROXY_BASE}/minecraft/block/${alias}.png`);
  }

  // Try item/ texture
  urls.push(`${TEXTURE_PROXY_BASE}/minecraft/item/${alias}.png`);

  // If not a known block, also try block/ as last resort
  if (!BLOCK_TEXTURES.has(alias)) {
    urls.push(`${TEXTURE_PROXY_BASE}/minecraft/block/${alias}.png`);
  }

  return urls;
}

// Cache of resolved icon URLs (avoid re-fetching on every render)
const iconCache = new Map();

/**
 * Renders a Minecraft item icon using the official game textures.
 * Cascading fallback: mod texture → item texture → block texture → emoji
 */
function ItemIcon({ itemName, size = 32 }) {
  const [urlIndex, setUrlIndex] = useState(0);
  const [allFailed, setAllFailed] = useState(false);

  if (!itemName) {
    return <span className="item-icon-emoji" style={{ fontSize: size * 0.7 }}>📦</span>;
  }

  // Use full item name as cache key (handles mod namespaces correctly)
  const cacheKey = itemName.replace(/^minecraft:/, '');

  // Check if we already know this item has no texture
  if (iconCache.get(cacheKey) === 'none' || allFailed) {
    return (
      <span className="item-icon-emoji" style={{ fontSize: size * 0.7 }}>
        {getItemEmoji(itemName)}
      </span>
    );
  }

  // If we have a cached URL, use it directly
  const cachedUrl = iconCache.get(cacheKey);
  if (cachedUrl && cachedUrl !== 'none') {
    return (
      <img
        className="item-icon-img"
        src={cachedUrl}
        alt={cacheKey}
        width={size}
        height={size}
        loading="lazy"
      />
    );
  }

  const urls = getTextureUrls(itemName);
  const currentUrl = urls[urlIndex];

  if (!currentUrl) {
    iconCache.set(cacheKey, 'none');
    return (
      <span className="item-icon-emoji" style={{ fontSize: size * 0.7 }}>
        {getItemEmoji(itemName)}
      </span>
    );
  }

  return (
    <img
      className="item-icon-img"
      src={currentUrl}
      alt={cacheKey}
      width={size}
      height={size}
      loading="lazy"
      onLoad={() => {
        iconCache.set(cacheKey, currentUrl);
      }}
      onError={() => {
        if (urlIndex + 1 < urls.length) {
          setUrlIndex(urlIndex + 1);
        } else {
          iconCache.set(cacheKey, 'none');
          setAllFailed(true);
        }
      }}
    />
  );
}

export default ItemIcon;