// Package modules - 炼器系统模块
// 对齐GDD-05 4.7 炼器流程详解 + GDD-27 九 天材地宝系统
package modules

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

	"github.com/heroiclabs/nakama-common/runtime"
	"github.com/jackc/pgx/v5"
)

// RegisterForging 注册炼器相关 RPC。
func RegisterForging(initializer runtime.Initializer) error {
	rpcs := map[string]func(runtime.Initializer) error{
		"ForgingService/CraftEquipment":  craftEquipment,
		"ForgingService/GetBlueprints":   getBlueprints,
		"ForgingService/RepairEquipment":  repairEquipment,
	}
	for path, fn := range rpcs {
		if err := initializer.RegisterRpc(path, fn); err != nil {
			return err
		}
	}
	return nil
}

// --- 请求/响应结构 ---

type craftEquipmentReq struct {
	BlueprintID string   `json:"blueprint_id"` // 图纸ID
	Materials   []string `json:"materials"`    // 材料ID列表
	Technique   string   `json:"technique"`    // 刚猛/柔韧/均衡/精密/狂暴
}

type getBlueprintsReq struct {
	CharacterID string `json:"character_id"`
	Grade       string `json:"grade"` // 可选：筛选品阶
}

type repairEquipmentReq struct {
	EquipmentID string   `json:"equipment_id"`
	Materials   []string `json:"materials"`
}

type blueprintData struct {
	ID              string      `json:"id"`
	Name            string      `json:"name"`
	Grade           string      `json:"grade"` // mortal/yellow/xuan/di/celestial/immortal
	EquipType       string      `json:"equip_type"` // weapon/armor/accessory
	RequiredMaterials interface{} `json:"required_materials"`
	RequiredLevel   int32       `json:"required_level"`
	SuccessRate     float64     `json:"success_rate"`
	BaseStats       interface{} `json:"base_stats"`
	TechniqueBonus  map[string]map[string]float64 `json:"technique_bonus"`
}

type craftedEquipData struct {
	BlueprintID   string      `json:"blueprint_id"`
	BlueprintName string      `json:"blueprint_name"`
	Grade         string      `json:"grade"`
	EquipType     string      `json:"equip_type"`
	Success       bool        `json:"success"`
	Quality       string      `json:"quality"` // normal/fine/excellent/perfect
	Stats         interface{} `json:"stats"`
	Skills        interface{} `json:"skills"`
	SetID         string      `json:"set_id"`
	ExpGain       int32       `json:"exp_gain"`
}

// --- 图纸配置 ---

var defaultBlueprints = map[string]blueprintData{
	"bp_iron_sword": {
		ID: "bp_iron_sword", Name: "铁剑图纸", Grade: "mortal", EquipType: "weapon",
		RequiredMaterials: []string{"mineral_xuantie"},
		RequiredLevel: 1, SuccessRate: 0.95,
		BaseStats: map[string]interface{}{"atk": 10, "def": 0},
		TechniqueBonus: map[string]map[string]float64{
			"strong":  {"atk": 1.15, "def": 0.95},
			"flexible": {"atk": 0.95, "def": 1.1},
			"balanced": {"atk": 1.0, "def": 1.0},
			"precise":  {"atk": 1.05, "def": 1.05},
			"frenzy":   {"atk": 1.2, "def": 0.9, "crit": 0.1},
		},
	},
	"bp_steel_armor": {
		ID: "bp_steel_armor", Name: "玄铁甲图纸", Grade: "yellow", EquipType: "armor",
		RequiredMaterials: []string{"mineral_xuantie", "mineral_hantie"},
		RequiredLevel: 2, SuccessRate: 0.85,
		BaseStats: map[string]interface{}{"atk": 0, "def": 25, "hp": 100},
		TechniqueBonus: map[string]map[string]float64{
			"strong":  {"atk": 1.0, "def": 1.1},
			"flexible": {"atk": 0.95, "def": 1.15},
			"balanced": {"atk": 1.0, "def": 1.1},
			"precise":  {"atk": 1.0, "def": 1.12},
			"frenzy":   {"atk": 1.05, "def": 1.0},
		},
	},
	"bp_spirit_blade": {
		ID: "bp_spirit_blade", Name: "灵器刀图纸", Grade: "xuan", EquipType: "weapon",
		RequiredMaterials: []string{"mineral_miinyin", "mineral_jingjin"},
		RequiredLevel: 3, SuccessRate: 0.75,
		BaseStats: map[string]interface{}{"atk": 45, "def": 5, "crit": 0.05},
		TechniqueBonus: map[string]map[string]float64{
			"strong":  {"atk": 1.2, "def": 0.9},
			"flexible": {"atk": 1.0, "def": 1.1},
			"balanced": {"atk": 1.1, "def": 1.05},
			"precise":  {"atk": 1.15, "def": 1.0, "crit": 0.05},
			"frenzy":   {"atk": 1.25, "def": 0.85, "crit": 0.15},
		},
	},
	"bp_dragon_scale": {
		ID: "bp_dragon_scale", Name: "龙鳞甲图纸", Grade: "di", EquipType: "armor",
		RequiredMaterials: []string{"mineral_longlinshi", "mineral_jingjin"},
		RequiredLevel: 4, SuccessRate: 0.65,
		BaseStats: map[string]interface{}{"atk": 10, "def": 80, "hp": 500, "element_resist": 0.15},
		TechniqueBonus: map[string]map[string]float64{
			"strong":  {"atk": 1.1, "def": 1.1},
			"flexible": {"atk": 0.95, "def": 1.2},
			"balanced": {"atk": 1.05, "def": 1.15},
			"precise":  {"atk": 1.0, "def": 1.18},
			"frenzy":   {"atk": 1.15, "def": 1.0},
		},
	},
	"bp_celestial_sword": {
		ID: "bp_celestial_sword", Name: "天品神剑图纸", Grade: "celestial", EquipType: "weapon",
		RequiredMaterials: []string{"mineral_tianwaiyuntie", "mineral_jingjin", "herb_tianlingye"},
		RequiredLevel: 5, SuccessRate: 0.50,
		BaseStats: map[string]interface{}{"atk": 120, "def": 15, "crit": 0.1, "element_dmg": 0.2},
		TechniqueBonus: map[string]map[string]float64{
			"strong":  {"atk": 1.25, "def": 0.85},
			"flexible": {"atk": 1.0, "def": 1.15},
			"balanced": {"atk": 1.15, "def": 1.05},
			"precise":  {"atk": 1.2, "def": 1.0, "crit": 0.1},
			"frenzy":   {"atk": 1.3, "def": 0.8, "crit": 0.2},
		},
	},
	"bp_immortal_artifact": {
		ID: "bp_immortal_artifact", Name: "仙器图纸", Grade: "immortal", EquipType: "weapon",
		RequiredMaterials: []string{"mineral_hundunqingjin", "mineral_hundunzhishi", "herb_hundunlingzhi"},
		RequiredLevel: 6, SuccessRate: 0.35,
		BaseStats: map[string]interface{}{"atk": 250, "def": 30, "crit": 0.15, "element_dmg": 0.35, "special": "chaos_damage"},
		TechniqueBonus: map[string]map[string]float64{
			"strong":  {"atk": 1.3, "def": 0.8},
			"flexible": {"atk": 1.0, "def": 1.2},
			"balanced": {"atk": 1.15, "def": 1.1},
			"precise":  {"atk": 1.2, "def": 1.05, "crit": 0.1},
			"frenzy":   {"atk": 1.35, "def": 0.75, "crit": 0.25},
		},
	},
}

// --- RPC 实现 ---

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

	// 获取图纸
	bp, ok := defaultBlueprints[req.BlueprintID]
	if !ok {
		return errResp(6101, "blueprint not found", traceID)
	}

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

	// 检查境界要求
	gradeRealmReq := map[string]int32{
		"mortal": 1, "yellow": 2, "xuan": 3, "di": 4, "celestial": 5, "immortal": 6,
	}
	if realmTier < gradeRealmReq[bp.Grade] {
		return errResp(6102, "realm too low for this blueprint", traceID)
	}

	// 计算成功率
	successRate := bp.SuccessRate

	// 手法加成
	if techniqueBonus, ok := bp.TechniqueBonus[req.Technique]; ok {
		if atkBonus, ok := techniqueBonus["atk"]; ok && atkBonus > 1.0 {
			successRate *= 0.95 // 高攻击手法成功率略降
		}
	}

	// 限制范围
	if successRate < 0.1 {
		successRate = 0.1
	}
	if successRate > 0.99 {
		successRate = 0.99
	}

	// 判定成功/失败
	success := rand.Float64() < successRate

	var result craftedEquipData
	result.BlueprintID = req.BlueprintID
	result.BlueprintName = bp.Name
	result.Grade = bp.Grade
	result.EquipType = bp.EquipType
	result.Success = success

	if success {
		// 成功：产出装备
		quality := "normal"
		if rand.Float64() < 0.15 {
			quality = "fine"
		}
		if rand.Float64() < 0.03 {
			quality = "excellent"
		}
		if rand.Float64() < 0.003 {
			quality = "perfect"
		}

		result.Quality = quality
		result.Stats = bp.BaseStats
		result.ExpGain = 15 + int32(realmTier*8)

		// 根据品质加成属性
		qualityMulti := map[string]float64{
			"normal": 1.0, "fine": 1.1, "excellent": 1.2, "perfect": 1.3,
		}
		multi := qualityMulti[quality]

		// 应用手法加成
		if techniqueBonus, ok := bp.TechniqueBonus[req.Technique]; ok {
			result.Stats = applyTechniqueBonus(result.Stats, techniqueBonus, multi)
		}

		// 更新角色经验
		_, err = hhdbPool.Exec(ctx, `
			UPDATE characters SET exp = exp + $1, updated_at = NOW() WHERE id = $2
		`, result.ExpGain, charID)
		if err != nil {
			logger.Error("craft equip update failed: %v", err)
			return errResp(9002, "internal error", traceID)
		}
	} else {
		// 失败：消耗材料，产出废品
		result.Quality = "normal"
		result.Stats = map[string]interface{}{"atk": 0, "def": 0}
		result.ExpGain = 5

		_, err = hhdbPool.Exec(ctx, `
			UPDATE characters SET exp = exp + $1, updated_at = NOW() WHERE id = $2
		`, result.ExpGain, charID)
		if err != nil {
			logger.Error("craft equip fail update failed: %v", err)
			return errResp(9002, "internal error", traceID)
		}
	}

	return okResp(result, traceID)
}

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

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

	// 筛选可用图纸
	gradeRealmReq := map[string]int32{
		"mortal": 1, "yellow": 2, "xuan": 3, "di": 4, "celestial": 5, "immortal": 6,
	}

	var blueprints []blueprintData
	for _, bp := range defaultBlueprints {
		if realmTier >= gradeRealmReq[bp.Grade] {
			if req.Grade == "" || req.Grade == bp.Grade {
				blueprints = append(blueprints, bp)
			}
		}
	}

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

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

	// 验证装备归属
	var charID string
	var durability, maxDurability int32
	err := hhdbPool.QueryRow(ctx, `
		SELECT a.character_id, a.durability, a.max_durability
		FROM artifacts a
		JOIN characters c ON a.character_id = c.id
		WHERE a.id = $1 AND c.player_id = $2
	`, req.EquipmentID, uid).Scan(&charID, &durability, &maxDurability)
	if err != nil {
		return errResp(6103, "equipment not found", traceID)
	}

	if durability >= maxDurability {
		return errResp(6104, "equipment already at max durability", traceID)
	}

	// 修复：恢复耐久
	newDurability := durability + int32(len(req.Materials)*10)
	if newDurability > maxDurability {
		newDurability = maxDurability
	}

	_, err = hhdbPool.Exec(ctx, `
		UPDATE artifacts SET durability = $1, updated_at = NOW() WHERE id = $2
	`, newDurability, req.EquipmentID)
	if err != nil {
		logger.Error("repair equipment failed: %v", err)
		return errResp(9002, "internal error", traceID)
	}

	return okResp(map[string]interface{}{
		"success":           true,
		"repaired_durability": newDurability,
		"max_durability":    maxDurability,
		"message":           "装备修复成功",
	}, traceID)
}

// --- 辅助函数 ---

func applyTechniqueBonus(stats interface{}, techniqueBonus map[string]float64, qualityMulti float64) map[string]interface{} {
	statsMap, ok := stats.(map[string]interface{})
	if !ok {
		return map[string]interface{}{}
	}

	result := make(map[string]interface{})
	for k, v := range statsMap {
		if floatVal, ok := v.(float64); ok {
			bonus := 1.0
			if k == "atk" {
				bonus = techniqueBonus["atk"]
			} else if k == "def" {
				bonus = techniqueBonus["def"]
			} else if k == "crit" {
				if critBonus, ok := techniqueBonus["crit"]; ok {
					bonus = 1.0 + critBonus
				}
			}
			result[k] = floatVal * bonus * qualityMulti
		} else {
			result[k] = v
		}
	}
	return result
}