<?php
namespace Game\Services;

use Game\Entities\Player;

/**
 * 装备强化服务模块
 * 提供独立的、可复用的装备强化功能
 * 可以强化任何装备（库存、装备栏等）
 */
class EquipmentEnhancer
{
    /**
     * 强化配置表
     * 等级 => [成功率%, 花费, 降级概率%]
     */
    private static array $enhanceConfig = [
        0  => ['rate' => 100, 'cost' => 50,   'downgrade' => 0],
        1  => ['rate' => 95,  'cost' => 100,  'downgrade' => 0],
        2  => ['rate' => 90,  'cost' => 150,  'downgrade' => 0],
        3  => ['rate' => 85,  'cost' => 200,  'downgrade' => 0],
        4  => ['rate' => 80,  'cost' => 300,  'downgrade' => 10],
        5  => ['rate' => 70,  'cost' => 400,  'downgrade' => 20],
        6  => ['rate' => 60,  'cost' => 500,  'downgrade' => 30],
        7  => ['rate' => 50,  'cost' => 650,  'downgrade' => 40],
        8  => ['rate' => 40,  'cost' => 800,  'downgrade' => 50],
        9  => ['rate' => 30,  'cost' => 1000, 'downgrade' => 60],
        10 => ['rate' => 20,  'cost' => 1500, 'downgrade' => 70],
        11 => ['rate' => 15,  'cost' => 2000, 'downgrade' => 80],
        12 => ['rate' => 10,  'cost' => 3000, 'downgrade' => 90],
        13 => ['rate' => 7,   'cost' => 4000, 'downgrade' => 95],
        14 => ['rate' => 5,   'cost' => 5000, 'downgrade' => 100],
    ];

    /**
     * 最大强化等级
     */
    public const MAX_ENHANCE_LEVEL = 14;

    /**
     * 每个强化等级的属性加成百分比
     */
    public const ENHANCE_BONUS_PER_LEVEL = 0.05; // 5%

    /**
     * 执行装备强化
     *
     * @param array &$item 装备数组引用（会直接修改）
     * @param Player $player 玩家对象（需要扣费）
     * @return array 强化结果数组
     *   [
     *     'success' => bool,           // 是否强化成功
     *     'message' => string,         // 结果消息
     *     'oldLevel' => int,           // 强化前等级
     *     'newLevel' => int,           // 强化后等级
     *     'cost' => int,               // 花费的灵石
     *     'downgraded' => bool,        // 是否发生了降级
     *   ]
     */
    public static function enhance(array &$item, Player $player): array
    {
        $itemName = $item['name'] ?? '未知装备';
        $currentLevel = $item['enhanceLevel'] ?? 0;

        // 检查是否已达最大强化等级
        if ($currentLevel >= self::MAX_ENHANCE_LEVEL) {
            return [
                'success' => false,
                'message' => "{$itemName} 已达最大强化等级！",
                'oldLevel' => $currentLevel,
                'newLevel' => $currentLevel,
                'cost' => 0,
                'downgraded' => false,
            ];
        }

        // 获取当前等级的强化配置
        $config = self::$enhanceConfig[$currentLevel];
        $cost = $config['cost'];
        $successRate = $config['rate'];
        $downgradeChance = $config['downgrade'];

        // 检查灵石是否足够
        if ($player->spiritStones < $cost) {
            $lack = $cost - $player->spiritStones;
            return [
                'success' => false,
                'message' => "灵石不足！还需要 {$lack} 灵石",
                'oldLevel' => $currentLevel,
                'newLevel' => $currentLevel,
                'cost' => 0,
                'downgraded' => false,
            ];
        }

        // 扣费
        $player->spendSpiritStones($cost);

        // 掷骰子检定成功
        $roll = rand(1, 100);
        $success = $roll <= $successRate;

        if ($success) {
            // 强化成功
            $item['enhanceLevel'] = $currentLevel + 1;
            $newLevel = $currentLevel + 1;

            return [
                'success' => true,
                'message' => "{$itemName} 强化成功！ +{$currentLevel} → +{$newLevel}",
                'oldLevel' => $currentLevel,
                'newLevel' => $newLevel,
                'cost' => $cost,
                'downgraded' => false,
            ];
        } else {
            // 强化失败
            $result = [
                'success' => false,
                'message' => "{$itemName} 强化失败...",
                'oldLevel' => $currentLevel,
                'newLevel' => $currentLevel,
                'cost' => $cost,
                'downgraded' => false,
            ];

            // 检查是否触发降级
            if ($currentLevel > 0 && $downgradeChance > 0) {
                $downgradeRoll = rand(1, 100);
                if ($downgradeRoll <= $downgradeChance) {
                    // 发生降级
                    $item['enhanceLevel'] = $currentLevel - 1;
                    $downgradedLevel = $currentLevel - 1;
                    $result['downgraded'] = true;
                    $result['newLevel'] = $downgradedLevel;
                    $result['message'] = "{$itemName} 强化失败并降级了... +{$currentLevel} → +{$downgradedLevel}";
                }
            }

            return $result;
        }
    }

    /**
     * 获取强化配置
     *
     * @param int $level 强化等级
     * @return array|null 配置数组或null
     */
    public static function getConfig(int $level): ?array
    {
        return self::$enhanceConfig[$level] ?? null;
    }

    /**
     * 获取所有强化配置
     *
     * @return array 完整的配置表
     */
    public static function getAllConfig(): array
    {
        return self::$enhanceConfig;
    }

    /**
     * 计算强化后的属性值
     *
     * @param int $baseValue 基础属性值
     * @param int $enhanceLevel 强化等级
     * @return int 强化后的属性值
     */
    public static function calculateEnhancedValue(int $baseValue, int $enhanceLevel): int
    {
        $multiplier = 1 + ($enhanceLevel * self::ENHANCE_BONUS_PER_LEVEL);
        return (int)($baseValue * $multiplier);
    }

    /**
     * 获取强化加成百分比
     *
     * @param int $enhanceLevel 强化等级
     * @return float 加成百分比 (例: 0.25 表示 25%)
     */
    public static function getEnhanceBonus(int $enhanceLevel): float
    {
        return $enhanceLevel * self::ENHANCE_BONUS_PER_LEVEL;
    }

    /**
     * 获取强化加成百分比（百分数形式）
     *
     * @param int $enhanceLevel 强化等级
     * @return int 加成百分数 (例: 25 表示 25%)
     */
    public static function getEnhanceBonusPercent(int $enhanceLevel): int
    {
        return (int)($enhanceLevel * self::ENHANCE_BONUS_PER_LEVEL * 100);
    }

    /**
     * 检查装备是否已达最大强化等级
     *
     * @param array $item 装备数组
     * @return bool
     */
    public static function isMaxLevel(array $item): bool
    {
        $level = $item['enhanceLevel'] ?? 0;
        return $level >= self::MAX_ENHANCE_LEVEL;
    }

    /**
     * 获取强化所需的总花费（从当前等级到目标等级）
     *
     * @param int $fromLevel 起始强化等级
     * @param int $toLevel 目标强化等级
     * @return int 总花费灵石数
     */
    public static function getTotalCost(int $fromLevel, int $toLevel): int
    {
        if ($fromLevel >= $toLevel || $toLevel > self::MAX_ENHANCE_LEVEL) {
            return 0;
        }

        $total = 0;
        for ($level = $fromLevel; $level < $toLevel; $level++) {
            if (isset(self::$enhanceConfig[$level])) {
                $total += self::$enhanceConfig[$level]['cost'];
            }
        }

        return $total;
    }
}