/**
 * Game Bridge - MAIN world content script
 *
 * Runs in the page's JavaScript context to access the Phaser game instance.
 * Polls for battle state and posts data to the ISOLATED world content script
 * via window.postMessage.
 *
 * PokeRogue uses Phaser 3, so the game instance and scene data are accessible
 * through window.Phaser.GAMES[0] or similar patterns. Method names on class
 * instances survive Vite/esbuild minification (property accesses are never mangled).
 */

(function () {
  'use strict';

  const EXT_SOURCE = 'pokerogue-type-ext';
  const POLL_INTERVAL_MS = 600;
  const GAME_FIND_RETRY_MS = 2000;
  const MAX_FIND_RETRIES = 60; // 2 minutes

  let game = null;
  let battleScene = null;
  let pollTimer = null;
  let findRetries = 0;
  let lastStateHash = '';

  // ─── Game Instance Discovery ───────────────────────────────────────

  /**
   * Try multiple strategies to find the Phaser game instance.
   */
  function findGameInstance() {
    // Strategy 1: Phaser global registry
    if (window.Phaser && window.Phaser.GAMES && window.Phaser.GAMES.length > 0) {
      return window.Phaser.GAMES[0];
    }

    // Strategy 2: Check common global variable names
    const candidates = ['game', 'phaserGame', 'gameInstance'];
    for (const name of candidates) {
      if (window[name] && window[name].scene) {
        return window[name];
      }
    }

    // Strategy 3: Scan for Phaser.Game instances on window
    for (const key of Object.keys(window)) {
      try {
        const obj = window[key];
        if (obj && typeof obj === 'object' && obj.scene && obj.canvas &&
            typeof obj.scene.getScenes === 'function') {
          return obj;
        }
      } catch (_) {
        // Some properties throw on access
      }
    }

    return null;
  }

  /**
   * Find the battle scene from the game's scene list.
   * Looks for scenes that have battle-specific methods/properties.
   */
  function findBattleScene(gameInstance) {
    if (!gameInstance || !gameInstance.scene) return null;

    let scenes;
    try {
      scenes = gameInstance.scene.getScenes(true); // active scenes
      if (!scenes || scenes.length === 0) {
        scenes = gameInstance.scene.scenes;
      }
    } catch (_) {
      scenes = gameInstance.scene.scenes;
    }

    if (!scenes) return null;

    for (const scene of scenes) {
      // PokeRogue's BattleScene has these characteristic properties
      if (scene && scene.currentBattle !== undefined &&
          typeof scene.getPlayerField === 'function' &&
          typeof scene.getEnemyField === 'function') {
        return scene;
      }
    }

    // Fallback: look for any scene with a "currentBattle" property
    for (const scene of scenes) {
      if (scene && scene.currentBattle !== undefined) {
        return scene;
      }
    }

    return null;
  }

  // ─── Data Extraction ───────────────────────────────────────────────

  /**
   * Safely get a Pokemon's display name.
   */
  function getPokemonName(pokemon) {
    if (!pokemon) return 'Unknown';
    try {
      if (typeof pokemon.getNameToRender === 'function') return pokemon.getNameToRender();
      if (pokemon.name) return pokemon.name;
      if (pokemon.species && pokemon.species.name) return pokemon.species.name;
    } catch (_) {}
    return 'Unknown';
  }

  /**
   * Safely get a Pokemon's type IDs.
   */
  function getPokemonTypes(pokemon) {
    if (!pokemon) return [];
    try {
      if (typeof pokemon.getTypes === 'function') {
        const types = pokemon.getTypes();
        if (Array.isArray(types)) return types.filter(t => t >= 0 && t <= 17);
      }
      // Fallback: check species data
      if (pokemon.species) {
        const types = [];
        if (pokemon.species.type1 !== undefined && pokemon.species.type1 >= 0) types.push(pokemon.species.type1);
        if (pokemon.species.type2 !== undefined && pokemon.species.type2 >= 0 && pokemon.species.type2 !== pokemon.species.type1) {
          types.push(pokemon.species.type2);
        }
        return types;
      }
    } catch (_) {}
    return [];
  }

  /**
   * Safely extract a Pokemon's moveset with type, power, and category.
   */
  function getPokemonMoves(pokemon) {
    if (!pokemon) return [];
    try {
      let moveset;
      if (typeof pokemon.getMoveset === 'function') {
        moveset = pokemon.getMoveset();
      } else if (pokemon.moveset) {
        moveset = pokemon.moveset;
      }

      if (!Array.isArray(moveset)) return [];

      return moveset.filter(m => m).map(m => {
        const move = (typeof m.getMove === 'function') ? m.getMove() : m;
        return {
          name: getName(m, move),
          type: getVal(move, 'type', m, 'type', -1),
          power: getVal(move, 'power', m, 'power', 0),
          category: getVal(move, 'category', m, 'category', 2),
          pp: getPP(m),
          ppMax: getMaxPP(m)
        };
      });
    } catch (_) {}
    return [];
  }

  function getName(m, move) {
    try {
      if (typeof m.getName === 'function') return m.getName();
      if (move && move.name) return move.name;
      if (m.name) return m.name;
    } catch (_) {}
    return 'Unknown';
  }

  function getVal(primary, pKey, fallback, fKey, def) {
    if (primary && primary[pKey] !== undefined) return primary[pKey];
    if (fallback && fallback[fKey] !== undefined) return fallback[fKey];
    return def;
  }

  function getPP(m) {
    try {
      if (typeof m.getMovePp === 'function' && m.ppUsed !== undefined) {
        return m.getMovePp() - m.ppUsed;
      }
      if (m.pp !== undefined) return m.pp;
    } catch (_) {}
    return -1;
  }

  function getMaxPP(m) {
    try {
      if (typeof m.getMovePp === 'function') return m.getMovePp();
      if (m.maxPp !== undefined) return m.maxPp;
    } catch (_) {}
    return -1;
  }

  /**
   * Check whether a Pokemon is alive / active on the field.
   */
  function isActive(pokemon) {
    if (!pokemon) return false;
    try {
      if (typeof pokemon.isActive === 'function') return pokemon.isActive();
      if (typeof pokemon.isFainted === 'function') return !pokemon.isFainted();
      if (pokemon.hp !== undefined) return pokemon.hp > 0;
    } catch (_) {}
    return true; // assume active if can't determine
  }

  // ─── State Reading ─────────────────────────────────────────────────

  /**
   * Read full battle state from the scene.
   */
  function readBattleState() {
    if (!battleScene || !battleScene.currentBattle) return null;

    try {
      const playerField = typeof battleScene.getPlayerField === 'function'
        ? battleScene.getPlayerField()
        : [];
      const enemyField = typeof battleScene.getEnemyField === 'function'
        ? battleScene.getEnemyField()
        : [];

      if (playerField.length === 0 && enemyField.length === 0) return null;

      const playerPokemon = playerField.filter(isActive).map(p => ({
        name: getPokemonName(p),
        types: getPokemonTypes(p),
        moves: getPokemonMoves(p)
      }));

      const enemyPokemon = enemyField.filter(isActive).map(p => ({
        name: getPokemonName(p),
        types: getPokemonTypes(p)
      }));

      if (playerPokemon.length === 0 || enemyPokemon.length === 0) return null;

      const isDouble = !!(battleScene.currentBattle.double);
      const waveIndex = battleScene.currentBattle.waveIndex || battleScene.currentBattle.turn || 0;

      return {
        playerPokemon,
        enemyPokemon,
        isDouble,
        waveIndex
      };
    } catch (e) {
      console.warn('[PokeRogue Ext] Error reading battle state:', e);
      return null;
    }
  }

  // ─── Communication ─────────────────────────────────────────────────

  function postState(state) {
    window.postMessage({
      source: EXT_SOURCE,
      type: 'BATTLE_STATE',
      data: state
    }, '*');
  }

  function postNoBattle() {
    window.postMessage({
      source: EXT_SOURCE,
      type: 'NO_BATTLE'
    }, '*');
  }

  function postStatus(status, detail) {
    window.postMessage({
      source: EXT_SOURCE,
      type: 'STATUS',
      data: { status, detail }
    }, '*');
  }

  // ─── Polling Loop ──────────────────────────────────────────────────

  function poll() {
    // Re-find battle scene each poll (scenes change)
    battleScene = findBattleScene(game);

    if (!battleScene || !battleScene.currentBattle) {
      if (lastStateHash !== 'no_battle') {
        postNoBattle();
        lastStateHash = 'no_battle';
      }
      return;
    }

    const state = readBattleState();
    if (!state) {
      if (lastStateHash !== 'no_battle') {
        postNoBattle();
        lastStateHash = 'no_battle';
      }
      return;
    }

    // Only post if state changed (avoid redundant messages)
    const hash = JSON.stringify(state);
    if (hash !== lastStateHash) {
      lastStateHash = hash;
      postState(state);
    }
  }

  function startPolling() {
    if (pollTimer) return;
    postStatus('connected', 'Monitoring battles...');
    pollTimer = setInterval(poll, POLL_INTERVAL_MS);
    poll(); // immediate first poll
  }

  // ─── Initialization ────────────────────────────────────────────────

  function tryFindGame() {
    game = findGameInstance();

    if (game) {
      console.log('[PokeRogue Ext] Game instance found');
      startPolling();
      return;
    }

    findRetries++;
    if (findRetries >= MAX_FIND_RETRIES) {
      console.warn('[PokeRogue Ext] Could not find game instance after', MAX_FIND_RETRIES, 'retries');
      postStatus('error', 'Could not find PokeRogue game instance. The game may not be loaded.');
      return;
    }

    setTimeout(tryFindGame, GAME_FIND_RETRY_MS);
  }

  // Listen for requests from the ISOLATED content script
  window.addEventListener('message', (event) => {
    if (event.data && event.data.source === EXT_SOURCE && event.data.type === 'REQUEST_STATE') {
      poll();
    }
  });

  // Start looking for the game
  console.log('[PokeRogue Ext] Game bridge loaded, searching for Phaser instance...');
  postStatus('searching', 'Looking for PokeRogue game...');

  // Wait a bit for the game to initialize
  setTimeout(tryFindGame, 1000);

})();