package router

import (
	"errors"
	"net/http"
	"strings"

	"chatapp3-golang/internal/common"
	"chatapp3-golang/internal/service/gameprovider"

	"github.com/gin-gonic/gin"
)

// registerGameProviderRoutes 注册统一游戏厂商 app 路由。
func registerGameProviderRoutes(engine *gin.Engine, javaClient authGateway, registry *gameprovider.Registry, visibility *gameprovider.VisibilityPolicy) {
	if registry == nil {
		return
	}

	appGroup := engine.Group("/app/game")
	appGroup.Use(authMiddleware(javaClient))
	appGroup.GET("/room/shortcut", func(c *gin.Context) {
		user, visible, ok := gameListAccess(c, visibility)
		if !ok {
			return
		}
		if !visible {
			writeOK(c, []publicRoomGameItem{})
			return
		}
		resp, err := registry.ListShortcutGames(c.Request.Context(), user, c.Query("roomId"))
		if err != nil {
			writeError(c, err)
			return
		}
		writeOK(c, publicRoomGameItems(resp))
	})
	appGroup.GET("/room/list", func(c *gin.Context) {
		user, visible, ok := gameListAccess(c, visibility)
		if !ok {
			return
		}
		if !visible {
			writeOK(c, publicRoomGameListResponse(&gameprovider.RoomGameListResponse{Items: []gameprovider.RoomGameListItem{}}))
			return
		}
		resp, err := registry.ListRoomGames(c.Request.Context(), user, c.Query("roomId"), c.Query("category"))
		if err != nil {
			writeError(c, err)
			return
		}
		writeOK(c, publicRoomGameListResponse(resp))
	})
	appGroup.GET("/state", func(c *gin.Context) {
		resp, err := registry.GetRoomState(c.Request.Context(), mustAuthUser(c), c.Query("roomId"))
		if err != nil {
			writeError(c, err)
			return
		}
		writeOK(c, publicRoomState(resp))
	})
	appGroup.POST("/launch", func(c *gin.Context) {
		var req gameprovider.LaunchRequest
		if err := c.ShouldBindJSON(&req); err != nil {
			writeError(c, common.NewAppError(http.StatusBadRequest, "bad_request", err.Error()))
			return
		}
		resp, err := registry.LaunchGame(c.Request.Context(), mustAuthUser(c), req, resolveClientIP(c))
		if err != nil {
			writeError(c, err)
			return
		}
		writeOK(c, publicLaunch(resp))
	})
	appGroup.POST("/close", func(c *gin.Context) {
		var req gameprovider.CloseRequest
		if err := c.ShouldBindJSON(&req); err != nil {
			writeError(c, common.NewAppError(http.StatusBadRequest, "bad_request", err.Error()))
			return
		}
		resp, err := registry.CloseGame(c.Request.Context(), mustAuthUser(c), req)
		if err != nil {
			writeError(c, err)
			return
		}
		writeOK(c, publicRoomState(resp))
	})

	providerGroup := engine.Group("/app/game/providers")
	providerGroup.Use(authMiddleware(javaClient))
	providerGroup.GET("", func(c *gin.Context) {
		_, visible, ok := gameListAccess(c, visibility)
		if !ok {
			return
		}
		if !visible {
			writeOK(c, gameprovider.ProviderListResponse{Items: []gameprovider.ProviderSummary{}})
			return
		}
		writeOK(c, registry.List())
	})
	providerGroup.GET("/:provider/room/shortcut", func(c *gin.Context) {
		user, visible, ok := gameListAccess(c, visibility)
		if !ok {
			return
		}
		if !visible {
			writeOK(c, gin.H{"items": []publicRoomGameItem{}})
			return
		}
		provider, ok := resolveGameProvider(c, registry)
		if !ok {
			return
		}
		resp, err := provider.ListShortcutGames(c.Request.Context(), user, c.Query("roomId"))
		if err != nil {
			writeError(c, err)
			return
		}
		writeOK(c, gin.H{"items": publicRoomGameItems(resp)})
	})
	providerGroup.GET("/:provider/room/list", func(c *gin.Context) {
		user, visible, ok := gameListAccess(c, visibility)
		if !ok {
			return
		}
		if !visible {
			writeOK(c, publicRoomGameListResponse(&gameprovider.RoomGameListResponse{Items: []gameprovider.RoomGameListItem{}}))
			return
		}
		provider, ok := resolveGameProvider(c, registry)
		if !ok {
			return
		}
		resp, err := provider.ListRoomGames(c.Request.Context(), user, c.Query("roomId"), c.Query("category"))
		if err != nil {
			writeError(c, err)
			return
		}
		writeOK(c, publicRoomGameListResponse(resp))
	})
	providerGroup.GET("/:provider/state", func(c *gin.Context) {
		provider, ok := resolveGameProvider(c, registry)
		if !ok {
			return
		}
		resp, err := provider.GetRoomState(c.Request.Context(), mustAuthUser(c), c.Query("roomId"))
		if err != nil {
			writeError(c, err)
			return
		}
		writeOK(c, publicRoomState(resp))
	})
	providerGroup.POST("/:provider/launch", func(c *gin.Context) {
		provider, ok := resolveGameProvider(c, registry)
		if !ok {
			return
		}
		var req gameprovider.LaunchRequest
		if err := c.ShouldBindJSON(&req); err != nil {
			writeError(c, common.NewAppError(http.StatusBadRequest, "bad_request", err.Error()))
			return
		}
		resp, err := launchProviderGame(c, registry, provider, req)
		if err != nil {
			writeError(c, err)
			return
		}
		writeOK(c, publicLaunch(resp))
	})
	providerGroup.POST("/:provider/close", func(c *gin.Context) {
		provider, ok := resolveGameProvider(c, registry)
		if !ok {
			return
		}
		var req gameprovider.CloseRequest
		if err := c.ShouldBindJSON(&req); err != nil {
			writeError(c, common.NewAppError(http.StatusBadRequest, "bad_request", err.Error()))
			return
		}
		resp, err := provider.CloseGame(c.Request.Context(), mustAuthUser(c), req)
		if err != nil {
			writeError(c, err)
			return
		}
		writeOK(c, publicRoomState(resp))
	})
}

func gameListAccess(c *gin.Context, visibility *gameprovider.VisibilityPolicy) (common.AuthUser, bool, bool) {
	user := mustAuthUser(c)
	// iOS 审核和上架场景需要隐藏游戏入口；这里放在统一列表门禁最前面，避免继续请求 Java 区域/等级接口或 provider SQL。
	if isIOSGameListClient(c) {
		return user, false, true
	}
	if gameprovider.IsEmptyGameListUser(user.UserID) {
		return user, false, true
	}
	if visibility == nil {
		return user, true, true
	}
	// 游戏列表只在列表入口做展示门禁，结果里的区域继续向下传给 provider SQL 做 regions 过滤。
	result, err := visibility.Evaluate(c.Request.Context(), user)
	if err != nil {
		writeError(c, err)
		return user, false, false
	}
	user.RegionID = result.RegionID
	user.RegionCode = result.RegionCode
	return user, result.Allow, true
}

func isIOSGameListClient(c *gin.Context) bool {
	return strings.EqualFold(strings.TrimSpace(c.GetHeader("Req-Client")), "ios")
}

func resolveGameProvider(c *gin.Context, registry *gameprovider.Registry) (gameprovider.Provider, bool) {
	provider, err := registry.Resolve(c.Param("provider"))
	if err != nil {
		writeError(c, err)
		return nil, false
	}
	return provider, true
}

func launchProviderGame(c *gin.Context, registry *gameprovider.Registry, provider gameprovider.Provider, req gameprovider.LaunchRequest) (*gameprovider.LaunchResponse, error) {
	user := mustAuthUser(c)
	clientIP := resolveClientIP(c)
	resp, err := provider.LaunchGame(c.Request.Context(), user, req, clientIP)
	if err == nil {
		return resp, nil
	}
	if !isGameNotFoundError(err) {
		return nil, err
	}
	// 旧客户端只能把热游列表项伪装成 LEADER 进入已有 WebView；这里再按 gameId 回到真实 provider，避免 LEADER 路由找不到 hg_*。
	return registry.LaunchGame(c.Request.Context(), user, req, clientIP)
}

func isGameNotFoundError(err error) bool {
	var appErr *common.AppError
	return errors.As(err, &appErr) && appErr.Code == "game_not_found"
}

type publicRoomGameItem struct {
	ID             int64          `json:"id"`
	GameID         string         `json:"gameId"`
	GameType       string         `json:"gameType,omitempty"`
	Provider       string         `json:"provider,omitempty"`
	VendorType     string         `json:"vendorType,omitempty"`
	ProviderGameID string         `json:"providerGameId,omitempty"`
	VendorGameID   string         `json:"vendorGameId,omitempty"`
	Name           string         `json:"name"`
	Cover          string         `json:"cover"`
	Category       string         `json:"category,omitempty"`
	Sort           int64          `json:"sort,omitempty"`
	LaunchMode     string         `json:"launchMode,omitempty"`
	FullScreen     bool           `json:"fullScreen"`
	GameMode       int            `json:"gameMode,omitempty"`
	SafeHeight     int            `json:"safeHeight,omitempty"`
	Orientation    int            `json:"orientation,omitempty"`
	PackageVersion string         `json:"packageVersion,omitempty"`
	Status         string         `json:"status,omitempty"`
	LaunchParams   map[string]any `json:"launchParams,omitempty"`
}

type publicRoomGameList struct {
	Items []publicRoomGameItem `json:"items"`
}

type publicRoomStateResponse struct {
	RoomID                string `json:"roomId"`
	State                 string `json:"state"`
	Provider              string `json:"provider,omitempty"`
	VendorType            string `json:"vendorType,omitempty"`
	GameSessionID         string `json:"gameSessionId,omitempty"`
	CurrentGameID         string `json:"currentGameId,omitempty"`
	CurrentProviderGameID string `json:"currentProviderGameId,omitempty"`
	CurrentVendorGameID   string `json:"currentVendorGameId,omitempty"`
	CurrentGameName       string `json:"currentGameName,omitempty"`
	CurrentGameCover      string `json:"currentGameCover,omitempty"`
	HostUserID            int64  `json:"hostUserId,omitempty"`
}

type publicLaunchResponse struct {
	ID             int64                    `json:"id,omitempty"`
	GameSessionID  string                   `json:"gameSessionId"`
	Provider       string                   `json:"provider,omitempty"`
	VendorType     string                   `json:"vendorType,omitempty"`
	GameID         string                   `json:"gameId"`
	ProviderGameID string                   `json:"providerGameId,omitempty"`
	VendorGameID   string                   `json:"vendorGameId,omitempty"`
	Entry          gameprovider.LaunchEntry `json:"entry"`
	LaunchConfig   any                      `json:"launchConfig,omitempty"`
	BridgeConfig   any                      `json:"bridgeConfig,omitempty"`
	RoomState      publicRoomStateResponse  `json:"roomState"`
}

func publicRoomGameItems(items []gameprovider.RoomGameListItem) []publicRoomGameItem {
	if len(items) == 0 {
		return []publicRoomGameItem{}
	}
	result := make([]publicRoomGameItem, 0, len(items))
	for _, item := range items {
		provider := appCompatProviderName(item.Provider)
		gameType := appCompatProviderName(item.GameType)
		result = append(result, publicRoomGameItem{
			ID:             item.ID,
			GameID:         item.GameID,
			GameType:       gameType,
			Provider:       provider,
			VendorType:     provider,
			ProviderGameID: item.ProviderGameID,
			VendorGameID:   item.ProviderGameID,
			Name:           item.Name,
			Cover:          item.Cover,
			Category:       item.Category,
			Sort:           item.Sort,
			LaunchMode:     item.LaunchMode,
			FullScreen:     item.FullScreen,
			GameMode:       item.GameMode,
			SafeHeight:     item.SafeHeight,
			Orientation:    item.Orientation,
			PackageVersion: item.PackageVersion,
			Status:         item.Status,
			LaunchParams:   publicLaunchParams(item.LaunchParams),
		})
	}
	return result
}

func publicLaunchParams(params map[string]any) map[string]any {
	if len(params) == 0 {
		return nil
	}
	result := make(map[string]any, len(params))
	for key, value := range params {
		if strings.EqualFold(strings.TrimSpace(key), "gameType") {
			if text, ok := value.(string); ok {
				result[key] = appCompatProviderName(text)
				continue
			}
		}
		result[key] = value
	}
	return result
}

func publicRoomGameListResponse(resp *gameprovider.RoomGameListResponse) *publicRoomGameList {
	if resp == nil {
		return &publicRoomGameList{Items: []publicRoomGameItem{}}
	}
	return &publicRoomGameList{
		Items: publicRoomGameItems(resp.Items),
	}
}

func publicRoomState(resp *gameprovider.RoomStateResponse) *publicRoomStateResponse {
	if resp == nil {
		return nil
	}
	return &publicRoomStateResponse{
		RoomID:                resp.RoomID,
		State:                 resp.State,
		Provider:              appCompatProviderName(resp.Provider),
		VendorType:            appCompatProviderName(resp.Provider),
		GameSessionID:         resp.GameSessionID,
		CurrentGameID:         resp.CurrentGameID,
		CurrentProviderGameID: resp.CurrentProviderGameID,
		CurrentVendorGameID:   resp.CurrentProviderGameID,
		CurrentGameName:       resp.CurrentGameName,
		CurrentGameCover:      resp.CurrentGameCover,
		HostUserID:            resp.HostUserID,
	}
}

func publicLaunch(resp *gameprovider.LaunchResponse) *publicLaunchResponse {
	if resp == nil {
		return nil
	}
	roomState := publicRoomState(&resp.RoomState)
	if roomState == nil {
		roomState = &publicRoomStateResponse{}
	}
	return &publicLaunchResponse{
		ID:             resp.ID,
		GameSessionID:  resp.GameSessionID,
		Provider:       appCompatProviderName(resp.Provider),
		VendorType:     appCompatProviderName(resp.Provider),
		GameID:         resp.GameID,
		ProviderGameID: resp.ProviderGameID,
		VendorGameID:   resp.ProviderGameID,
		Entry:          resp.Entry,
		LaunchConfig:   resp.LaunchConfig,
		BridgeConfig:   resp.LaunchConfig,
		RoomState:      *roomState,
	}
}

func appCompatProviderName(provider string) string {
	// 客户端历史上只认识 LEADER，不认识内部厂商名 LINGXIAN，所以出参继续保持旧字段值。
	if strings.EqualFold(strings.TrimSpace(provider), "LINGXIAN") {
		return "LEADER"
	}
	// 旧客户端没有 HOTGAME 页面；热游先按 LEADER 展示并进入已有 WebView，launch 路由再按 hg_* 分发回真实热游 provider。
	switch strings.ToUpper(strings.ReplaceAll(strings.TrimSpace(provider), "_", "")) {
	case "HOTGAME", "REYOU", "LALU":
		return "LEADER"
	}
	return provider
}