package service

import (
	"context"
	"encoding/json"
	"net/url"
	"strings"

	"affiliate_dash/internal/model"
)

const (
	ProviderDLC   = "dlc"
	ProviderLewan = "lewan"
	ProviderRock  = "rock"

	RoutingModePriority = "priority"
	RoutingModeLewan    = "lewan"
	RoutingModeDLC      = "dlc"
	RoutingModeRock     = "rock"
)

// ProductRoutingConfig 商品履约配置
type ProductRoutingConfig struct {
	RoutingMode    string   `json:"routing_mode"`     // priority | lewan | dlc
	Priority       []string `json:"priority"`         // ["lewan", "dlc"] 或 ["dlc", "lewan"]
	DLCGoodID      string   `json:"dlc_good_id"`      // 第一平台 GoodID
	LewanProductID string   `json:"lewan_product_id"` // 乐玩商品 UUID
	LewanName      string   `json:"lewan_name,omitempty"`
	DeliveryType   string   `json:"delivery_type,omitempty"` // LINK_BINDING / EMAIL_BINDING
}

// ParseProductRoutingConfig 解析商品履约配置，若未配置则根据 SKU 默认走 DLC 兜底。
func ParseProductRoutingConfig(fulfillmentConfig string, sku string) ProductRoutingConfig {
	var cfg ProductRoutingConfig
	if strings.TrimSpace(fulfillmentConfig) != "" {
		_ = json.Unmarshal([]byte(fulfillmentConfig), &cfg)
	}

	// 兼容老配置：只抽取字段，不提前固化 routing_mode，
	// 避免仅有 lewan_product_id 时在补齐内置 DLC 前被锁成 lewan-only。
	legacyProvider := ""
	if cfg.RoutingMode == "" {
		var legacy struct {
			Provider       string `json:"provider"`
			LewanProductID string `json:"lewan_product_id"`
			DLCGoodID      string `json:"dlc_good_id"`
		}
		if strings.TrimSpace(fulfillmentConfig) != "" {
			_ = json.Unmarshal([]byte(fulfillmentConfig), &legacy)
		}
		legacyProvider = strings.TrimSpace(legacy.Provider)
		if cfg.LewanProductID == "" && legacy.LewanProductID != "" {
			cfg.LewanProductID = legacy.LewanProductID
		}
		if cfg.DLCGoodID == "" && legacy.DLCGoodID != "" {
			cfg.DLCGoodID = legacy.DLCGoodID
		}
	}

	// 默认兜底：若第一平台有内置 GoodID，补齐 DLCGoodID
	builtinDLC := deliveryGoodID("dlc", sku)
	if cfg.DLCGoodID == "" && builtinDLC != "" {
		cfg.DLCGoodID = builtinDLC
	}

	// 若未配置 RoutingMode：优先判断是否为 Rock 渠道专属商品
	if cfg.RoutingMode == "" {
		if strings.HasPrefix(sku, "rock_") {
			cfg.RoutingMode = RoutingModeRock
			cfg.Priority = []string{ProviderRock}
		} else if cfg.LewanProductID != "" && cfg.DLCGoodID != "" {
			cfg.RoutingMode = RoutingModePriority
			cfg.Priority = []string{ProviderLewan, ProviderDLC}
		} else if cfg.LewanProductID != "" || legacyProvider == ProviderLewan {
			cfg.RoutingMode = RoutingModeLewan
		} else if legacyProvider == ProviderDLC {
			cfg.RoutingMode = RoutingModeDLC
		} else {
			cfg.RoutingMode = RoutingModeDLC
		}
	}

	if len(cfg.Priority) == 0 && cfg.RoutingMode == RoutingModePriority {
		cfg.Priority = []string{ProviderLewan, ProviderDLC}
	}

	return cfg
}

// DeliveryOrderState 抽象商品履约状态
type DeliveryOrderState struct {
	CanShip          bool
	CannotShipReason string
	Product          *DeliveryProduct
	Good             map[string]interface{}
	Provider         string
}

// ProviderBindResult 抽象绑定返回
type ProviderBindResult struct {
	BindUUID            string `json:"bind_uuid"`
	BindURL             string `json:"bind_url"`
	QRURL               string `json:"qr_url"`
	Bound               bool   `json:"bound"`
	GameAccount         string `json:"game_account,omitempty"`
	RoleName            string `json:"role_name,omitempty"`
	GameChannel         string `json:"game_channel,omitempty"`
	ExpectedGameAccount string `json:"expected_game_account,omitempty"`
	Mismatch            bool   `json:"mismatch,omitempty"`
	Message             string `json:"message,omitempty"`
	Provider            string `json:"provider,omitempty"`
	// PatchResultData 绑定成功后写入订单 result_data（如 lewan_order_id）
	PatchResultData map[string]interface{} `json:"-"`
}

// ProviderSubmitResult 抽象提交返回
type ProviderSubmitResult struct {
	ProviderOrderNo string                 `json:"provider_order_no"`
	NextStatus      string                 `json:"next_status"` // delivering / delivered
	Message         string                 `json:"message"`
	GameAccount     map[string]interface{} `json:"game_account,omitempty"`
	UpstreamOrder   interface{}            `json:"delivery,omitempty"`
	PatchResultData map[string]interface{} `json:"patch_result_data,omitempty"`
}

// ProviderSyncResult 抽象主动查单同步状态返回
type ProviderSyncResult struct {
	Status          string // success / failed / delivering / ""
	ProviderOrderNo string
	FailReason      string
	GameUID         string
	RoleName        string
	RoleArea        string
	RawPayload      string
}

// FulfillmentProvider 统一履约提供商接口
type FulfillmentProvider interface {
	Name() string
	PrepareDelivery(ctx context.Context, order *model.FulfillmentOrder, openOrder *OpenOrderQuery) (*DeliveryOrderState, error)
	Bind(ctx context.Context, order *model.FulfillmentOrder, gameAccount string) (*ProviderBindResult, error)
	CheckBind(ctx context.Context, order *model.FulfillmentOrder, bindUUID string) (*ProviderBindResult, error)
	Submit(ctx context.Context, order *model.FulfillmentOrder, gameAccount, bindUUID string) (*ProviderSubmitResult, error)
	SyncStatus(ctx context.Context, order *model.FulfillmentOrder) (*ProviderSyncResult, error)
	Cancel(ctx context.Context, order *model.FulfillmentOrder) error
}

// FulfillmentRouter 履约路由器
type FulfillmentRouter struct {
	providers map[string]FulfillmentProvider
}

func NewFulfillmentRouter(providers ...FulfillmentProvider) *FulfillmentRouter {
	m := make(map[string]FulfillmentProvider)
	for _, p := range providers {
		if p != nil {
			m[p.Name()] = p
		}
	}
	return &FulfillmentRouter{providers: m}
}

func (r *FulfillmentRouter) GetProvider(name string) FulfillmentProvider {
	return r.providers[name]
}

// ResolveProviders 返回订单可选的履约渠道列表（按优先级排序）
func (r *FulfillmentRouter) ResolveProviders(order *model.FulfillmentOrder) ([]FulfillmentProvider, ProductRoutingConfig) {
	sku := ""
	configStr := ""
	if order != nil {
		sku = order.ProductSKU
		if order.MerchantProduct != nil {
			configStr = order.MerchantProduct.FulfillmentConfig
		}
	}

	cfg := ParseProductRoutingConfig(configStr, sku)

	// 如果订单已有选定渠道记录（例如已经对乐玩或 DLC 发起过 bind/submit），则锁定该渠道
	if order != nil && strings.TrimSpace(order.ResultData) != "" {
		if active := resultDataString(order.ResultData, "provider"); active != "" {
			if p, ok := r.providers[active]; ok {
				return []FulfillmentProvider{p}, cfg
			}
		}
	}

	var list []FulfillmentProvider
	switch cfg.RoutingMode {
	case RoutingModeLewan:
		if p, ok := r.providers[ProviderLewan]; ok {
			list = append(list, p)
		}
		// 显式 lewan 但商品同时具备 DLC 配置时，乐玩不可用（密钥未配/上游失败）允许回退 DLC，
		// 避免「套装-浪漫天命」等双渠道商品在 LEWAN_* 未注入时提交 UID 直接失败。
		if cfg.DLCGoodID != "" {
			if p, ok := r.providers[ProviderDLC]; ok {
				list = append(list, p)
			}
		}
	case RoutingModeDLC:
		if p, ok := r.providers[ProviderDLC]; ok {
			list = append(list, p)
		}
	case RoutingModeRock:
		if p, ok := r.providers[ProviderRock]; ok {
			list = append(list, p)
		}
	case RoutingModePriority:
		for _, name := range cfg.Priority {
			if p, ok := r.providers[name]; ok {
				list = append(list, p)
			}
		}
	}

	// 最终安全兜底：若解析为空，优先尝试 DLC，若无则尝试任意可用 provider
	if len(list) == 0 {
		if dlc, ok := r.providers[ProviderDLC]; ok {
			list = append(list, dlc)
		} else {
			for _, p := range r.providers {
				list = append(list, p)
				break
			}
		}
	}

	return list, cfg
}

func qrCodeURL(targetURL string) string {
	return "https://api.qrserver.com/v1/create-qr-code/?size=240x240&data=" + url.QueryEscape(targetURL)
}

func truncateText(s string, maxLen int) string {
	if len(s) <= maxLen {
		return s
	}
	return s[:maxLen] + "..."
}