// Package modules - 世界Boss系统模块
// 对齐GDD-33 世界Boss与大型PVE协作机制
package modules

import (
	"context"
	"database/sql"
	"encoding/json"
	"time"

	"github.com/heroiclabs/nakama-common/runtime"
)

// RegisterWorldBoss 注册世界Boss相关 RPC。
func RegisterWorldBoss(initializer runtime.Initializer) error {
	rpcs := map[string]func(context.Context, runtime.Logger, *sql.DB, runtime.NakamaModule, string) (string, error){
		"WorldBossService/GetActiveBosses":  getActiveBosses,
		"WorldBossService/JoinBossFight":    joinBossFight,
		"WorldBossService/GetBossRanking":   getBossRanking,
	}
	for path, fn := range rpcs {
		if err := initializer.RegisterRpc(path, fn); err != nil {
			return err
		}
	}
	return nil
}

type getActiveBossesReq struct {
	WorldTier int32 `json:"world_tier"`
}

type joinBossFightReq struct {
	BossID string `json:"boss_id"`
}

type getBossRankingReq struct {
	BossID string `json:"boss_id"`
}

type worldBossData struct {
	ID          string      `json:"id"`
	Name        string      `json:"name"`
	WorldTier   int32       `json:"world_tier"`
	RealmTier   int32       `json:"realm_tier"`
	MaxHP       int64       `json:"max_hp"`
	CurrentHP   int64       `json:"current_hp"`
	Attack      int32       `json:"attack"`
	Defense     int32       `json:"defense"`
	Elements    interface{} `json:"elements"`
	SpawnTime   time.Time   `json:"spawn_time"`
	DespawnTime time.Time   `json:"despawn_time"`
	Participants int32      `json:"participants"`
	Status      string      `json:"status"` // spawning/active/defeated/despawned
}

type bossRankingData struct {
	BossID     string `json:"boss_id"`
	CharacterID string `json:"character_id"`
	CharName   string `json:"char_name"`
	DamageDealt int64  `json:"damage_dealt"`
	Rank       int32  `json:"rank"`
}

// 世界Boss模板
var worldBossTemplates = map[string]worldBossData{
	"ancient_dragon_boss": {
		ID: "ancient_dragon_boss", Name: "远古巨龙", WorldTier: 4, RealmTier: 6,
		MaxHP: 5000000, Attack: 800, Defense: 500,
		Elements: []string{"fire", "lightning"},
		Status: "spawning",
	},
	"chaos_eye": {
		ID: "chaos_eye", Name: "混沌之眼", WorldTier: 5, RealmTier: 8,
		MaxHP: 20000000, Attack: 3000, Defense: 2000,
		Elements: []string{"chaos"},
		Status: "spawning",
	},
	"old_god_avatar": {
		ID: "old_god_avatar", Name: "旧神化身", WorldTier: 6, RealmTier: 9,
		MaxHP: 100000000, Attack: 10000, Defense: 8000,
		Elements: []string{"chaos", "void"},
		Status: "spawning",
	},
}

func getActiveBosses(ctx context.Context, logger runtime.Logger, db *sql.DB, nk runtime.NakamaModule, payload string) (string, error) {
	traceID := newTraceID()

	var req getActiveBossesReq
	if err := json.Unmarshal([]byte(payload), &req); err != nil {
		return errResp(2001, "invalid payload", traceID)
	}

	var bosses []worldBossData
	for _, boss := range worldBossTemplates {
		if boss.WorldTier == req.WorldTier || req.WorldTier == 0 {
			bosses = append(bosses, boss)
		}
	}

	return okResp(map[string]interface{}{
		"bosses": bosses,
		"count":  len(bosses),
	}, traceID)
}

func joinBossFight(ctx context.Context, logger runtime.Logger, db *sql.DB, nk runtime.NakamaModule, payload string) (string, error) {
	traceID := newTraceID()
	uid := userIDFromCtx(ctx)
	if uid == "" {
		return errResp(1001, "missing token", traceID)
	}

	var req joinBossFightReq
	if err := json.Unmarshal([]byte(payload), &req); err != nil {
		return errResp(2001, "invalid payload", traceID)
	}

	// 获取角色信息
	var charID string
	var charName string
	var realmTier int32
	err := hhdbPool.QueryRow(ctx, `
		SELECT id, name, realm_tier FROM characters WHERE player_id = $1 AND status = 'active'
		ORDER BY created_at DESC LIMIT 1
	`, uid).Scan(&charID, &charName, &realmTier)
	if err != nil {
		return errResp(4002, "character not found", traceID)
	}

	// 检查Boss是否存在
	boss, ok := worldBossTemplates[req.BossID]
	if !ok {
		return errResp(8601, "boss not found", traceID)
	}

	// 检查境界要求
	if realmTier < boss.RealmTier-2 {
		return errResp(8602, "realm too low for this boss", traceID)
	}

	// 加入Boss战（简化版）
	logger.Info("Join boss fight: boss=%s player=%s", req.BossID, charName)

	return okResp(map[string]interface{}{
		"success":       true,
		"boss_id":       req.BossID,
		"boss_name":     boss.Name,
		"character_id":  charID,
		"character_name": charName,
		"message":       "已加入Boss战",
	}, traceID)
}

func getBossRanking(ctx context.Context, logger runtime.Logger, db *sql.DB, nk runtime.NakamaModule, payload string) (string, error) {
	traceID := newTraceID()

	var req getBossRankingReq
	if err := json.Unmarshal([]byte(payload), &req); err != nil {
		return errResp(2001, "invalid payload", traceID)
	}

	// 模拟排行榜
	ranking := []bossRankingData{
		{BossID: req.BossID, CharacterID: "char_1", CharName: "仙尊", DamageDealt: 1000000, Rank: 1},
		{BossID: req.BossID, CharacterID: "char_2", CharName: "剑圣", DamageDealt: 800000, Rank: 2},
		{BossID: req.BossID, CharacterID: "char_3", CharName: "魔尊", DamageDealt: 600000, Rank: 3},
	}

	return okResp(map[string]interface{}{
		"boss_id":  req.BossID,
		"ranking":  ranking,
		"count":    len(ranking),
	}, traceID)
}