<?php
namespace Game\System;

use Game\Database\AbilityRepository;
use Game\Event\Event;
use Game\Event\EventListenerInterface;
use Game\Event\EventDispatcher;
use Game\Model\Ability;
use Game\Model\Player;
use Game\Model\Enemy; // 假设战斗逻辑中需要 Enemy

/**
 * AbilityService: 负责技能的加载、管理和效果计算。
 */
class AbilityService implements EventListenerInterface {

    private EventDispatcher $dispatcher;
    private StateManager $stateManager;

    // ... 现有属性 ...
    private AbilityRepository $abilityRepository;

    // ⭐ 修正构造函数：注入 AbilityRepository
    public function __construct(EventDispatcher $dispatcher, StateManager $stateManager, AbilityRepository $abilityRepository) {
        $this->dispatcher = $dispatcher;
        $this->stateManager = $stateManager;
        $this->abilityRepository = $abilityRepository;
    }


    public function learnInitialAbilities(Player $player): void {
        $initialAbilities = ['FIREBALL', 'HEAL']; // 仍然可以硬编码初始技能的ID

        foreach ($initialAbilities as $id) {
            // ⭐ 使用 Repository 获取数据
            $data = $this->abilityRepository->find($id);
            if ($data) {
                $player->learnAbility(new Ability(
                    $data['id'],
                    $data['name'],
                    $data['type'],
                    $data['mana_cost'],
                    $data['power'],
                    $data['scaling']
                ));
            }
        }
    }

    public function handleEvent(Event $event): void {
        switch ($event->getType()) {
            case 'GameStartEvent':
                // 确保在游戏开始时玩家获得技能
                $this->learnInitialAbilities($this->stateManager->getPlayer());
                break;
            case 'CastAbilityEvent': // 响应 BattleService 的请求
                $this->handleCastAbility($event->getPayload()['abilityId'], $event->getPayload()['target']);
                break;
            // TODO: 未来监听 LevelUpEvent 来学习新技能
        }
    }

    /**
     * 处理技能施放的核心逻辑
     */
    private function handleCastAbility(string $abilityId, Enemy $target): void {
        $player = $this->stateManager->getPlayer();
        $ability = $player->getAbilities()[$abilityId] ?? null;

        if (!$ability) {
            $this->dispatcher->dispatch(new Event('SystemMessage', ['message' => '❌ 未知的技能。']));
            return;
        }

        // 1. 检查资源消耗
        if (!$player->spendMana($ability->manaCost)) {
            $this->dispatcher->dispatch(new Event('SystemMessage', ['message' => '❌ MP不足，无法施放 ' . $ability->name . '。']));
            return;
        }

        $this->dispatcher->dispatch(new Event('SystemMessage', ['message' => "✨ {$player->getName()} 施放了 <fg=blue>{$ability->name}</>！(-{$ability->manaCost} MP)"]));

        // 2. 计算效果
        $damage = 0;
        $heal = 0;

        $scalingValue = match ($ability->scaling) {
            'attack' => $player->getAttack(),
            'mana' => $player->getMaxMana(), // 魔法值越高，技能越强
            default => 0,
        };

        // 基础伤害计算：威力 + (加成属性 * 0.5)
        $rawEffect = $ability->power + (int)($scalingValue * 0.5);

        // 3. 应用效果
        switch ($ability->type) {
            case 'damage':
                $damage = $target->takeDamage($rawEffect);
                $this->dispatcher->dispatch(new Event('SystemMessage', [
                    'message' => "💥 {$ability->name} 对 {$target->getName()} 造成了 <fg=red>{$damage}</> 点伤害！"
                ]));
                break;
            case 'heal':
                $heal = $player->heal($rawEffect);
                $this->dispatcher->dispatch(new Event('SystemMessage', [
                    'message' => "💖 恢复了 <fg=green>{$heal}</> 点生命值！"
                ]));
                break;
        }

        // 4. 触发 BattleService 的事件，让其检查战斗是否结束
        $this->dispatcher->dispatch(new Event('AbilityEffectApplied', ['target' => $target]));
    }
}