<?php
namespace Game\Core;

class SpellCalculator
{
    /**
     * 计算法术消耗
     */
    public static function calculateCost(array $spellInfo): int
    {
        $baseCost = $spellInfo['cost'] ?? 20;
        $enhanceLevel = $spellInfo['enhanceLevel'] ?? 0;
        // 强化减少消耗: 每级 -2
        return max(1, $baseCost - ($enhanceLevel * 2));
    }

    /**
     * 计算法术伤害
     * @return array ['damage' => int, 'isCrit' => bool, 'baseDamage' => int, 'multiplier' => float]
     */
    public static function calculateDamage(array $spellInfo, array $attackerStats, array $defenderStats, int $bonus = 0, bool $isAoe = false): array
    {


        // 基础倍率
        $baseMultiplier = $spellInfo['damage_ratio'] ?? ($spellInfo['damage'] ?? 1.0);
        
        // 实际倍率 (含强化加成)
        $actualMultiplier = $baseMultiplier * (1 + $bonus / 100);
        
        // 计算方式
        $calcType = $spellInfo['calc_type'] ?? 'matk';
        
        // 基础伤害 (根据 calc_type)
        switch ($calcType) {
            case 'patk':
                $baseDamage = (int)($attackerStats['patk'] * $actualMultiplier);
                break;
            case 'hybrid':
                // 取魔攻与物攻的平均值
                $combined = ($attackerStats['matk'] + $attackerStats['patk']) / 2;
                $baseDamage = (int)($combined * $actualMultiplier);
                break;
            case 'low_def_bonus':
                // 对低防御目标额外加成 20%
                $baseDamage = (int)($attackerStats['matk'] * $actualMultiplier);
                $def = $defenderStats['pdef'] ?? 0;
                if ($def < 5) {
                    $baseDamage = (int)($baseDamage * 1.2);
                }
                break;
            case 'matk_scaled':
                // 根据敌人数加成，假设 spellInfo 包含 enemy_count_bonus (每个敌人加成比例) 和 enemy_count
                $baseDamage = (int)($attackerStats['matk'] * $actualMultiplier);
                if (isset($spellInfo['enemy_count_bonus'])) {
                    $bonusPct = $spellInfo['enemy_count_bonus'];
                    $enemyCount = $spellInfo['enemy_count'] ?? 1;
                    $baseDamage = (int)($baseDamage * (1 + $bonusPct * $enemyCount));
                }
                break;
            case 'hp_percent':
                // 基于目标最大生命值的百分比
                $baseDamage = (int)(($defenderStats['maxHp'] ?? 0) * $actualMultiplier);
                break;
            case 'defense':
                // 基于目标防御属性 (物防+魔防)
                $defSum = ($defenderStats['pdef'] ?? 0) + ($defenderStats['mdef'] ?? 0);
                $baseDamage = (int)($defSum * $actualMultiplier);
                break;
            case 'crit_damage':
                // 使用物攻作为基础，后续在暴击阶段乘以暴击系数
                $baseDamage = (int)($attackerStats['patk'] * $actualMultiplier);
                break;
            case 'crit_aoe':
                // 同 crit_damage，AOE 暴击率已在上层处理
                $baseDamage = (int)($attackerStats['patk'] * $actualMultiplier);
                break;
            case 'dispersed_damage':
                // 基于魔攻，乘以分散系数 (spellInfo['dispersion'])
                $baseDamage = (int)($attackerStats['matk'] * $actualMultiplier);
                if (isset($spellInfo['dispersion'])) {
                    $baseDamage = (int)($baseDamage * $spellInfo['dispersion']);
                }
                break;
            default:
                // 默认使用魔攻
                $baseDamage = (int)($attackerStats['matk'] * $actualMultiplier);
        }
        
        // 计算防御减免
        $resistance = $defenderStats['mdef'] ?? 0;
        $damage = max(1, $baseDamage - $resistance);
        
        // 暴击计算
        $critRate = $attackerStats['crit'] ?? 0;
        if ($isAoe) {
            $critRate /= 2; // AOE 暴击率减半
        }
        
        $isCrit = rand(1, 100) <= $critRate;
        if ($isCrit) {
            $critDmg = $attackerStats['critdmg'] ?? 150;
            $damage = (int)($damage * ($critDmg / 100));
        }
        
        return [
            'damage' => $damage,
            'isCrit' => $isCrit,
            'baseDamage' => $baseDamage,
            'multiplier' => $baseMultiplier // 返回基础倍率用于显示
        ];
    }

    /**
     * 计算治疗量
     */
    public static function calculateHeal(array $spellInfo, array $casterStats, int $bonus = 0): int
    {
        // 计算方式
        $calcType = $spellInfo['calc_type'] ?? 'matk';
        $healRatio = $spellInfo['heal'] ?? 0.5;
        $healBase = $spellInfo['heal_base'] ?? 20;
        
        // 基础治疗量 (根据 calc_type)
        switch ($calcType) {
            case 'patk':
                $healAmount = (int)($casterStats['patk'] * $healRatio + $healBase);
                break;
            case 'hybrid':
                $combined = ($casterStats['matk'] + $casterStats['patk']) / 2;
                $healAmount = (int)($combined * $healRatio + $healBase);
                break;
            case 'defense':
                $defSum = ($casterStats['pdef'] ?? 0) + ($casterStats['mdef'] ?? 0);
                $healAmount = (int)($defSum * $healRatio + $healBase);
                break;
            case 'hp_percent':
                $healAmount = (int)($casterStats['maxHp'] * $healRatio + $healBase);
                break;
            case 'team_sync':
                $teamSize = $spellInfo['team_size'] ?? 1;
                $teamBonus = $spellInfo['team_bonus'] ?? 0;
                $healAmount = (int)($casterStats['matk'] * $healRatio + $healBase);
                $healAmount = (int)($healAmount * (1 + $teamBonus * $teamSize));
                break;
            case 'smart_heal':
                // 智能治疗，先按魔攻计算，后续在 Battle 中会选择低血量目标
                $healAmount = (int)($casterStats['matk'] * $healRatio + $healBase);
                break;
            case 'crit_heal':
                $healAmount = (int)($casterStats['matk'] * $healRatio + $healBase);
                $critRate = $casterStats['crit'] ?? 0;
                $isCrit = rand(1, 100) <= $critRate;
                if ($isCrit) {
                    $critDmg = $casterStats['critdmg'] ?? 150;
                    $healAmount = (int)($healAmount * ($critDmg / 100));
                }
                break;
            default:
                $healAmount = (int)($casterStats['matk'] * $healRatio + $healBase);
                break;
        }
        
        // 应用强化加成
        return (int)($healAmount * (1 + $bonus / 100));
    }

    /**
     * 根据品质获取数组索引
     */
    public static function getQualityIndex(string $quality): int
    {
        return match($quality) {
            'common' => 0,
            'rare' => 1,
            'epic' => 2,
            'legendary' => 3,
            default => 0,
        };
    }
}