package handlers

import (
	"encoding/json"
	"errors"
	"fmt"
	"strconv"

	"github.com/SamuelTariku/FortuneBet-Backend/internal/domain"
	"github.com/SamuelTariku/FortuneBet-Backend/internal/services/virtualGame/veli"
	"github.com/SamuelTariku/FortuneBet-Backend/internal/web_server/response"
	"github.com/gofiber/fiber/v2"
)

type launchVirtualGameReq struct {
	GameID   string `json:"game_id" validate:"required" example:"1"`
	Currency string `json:"currency" validate:"required,len=3" example:"USD"`
	Mode     string `json:"mode" validate:"required,oneof=fun real" example:"real"`
}

type launchVirtualGameRes struct {
	LaunchURL string `json:"launch_url"`
}

// LaunchVirtualGame godoc
// @Summary Launch a PopOK virtual game
// @Description Generates a URL to launch a PopOK game
// @Tags Virtual Games - PopOK
// @Accept json
// @Produce json
// @Security Bearer
// @Param launch body launchVirtualGameReq true "Game launch details"
// @Success 200 {object} launchVirtualGameRes
// @Failure 400 {object} domain.ErrorResponse
// @Failure 401 {object} domain.ErrorResponse
// @Failure 500 {object} domain.ErrorResponse
// @Router /virtual-game/launch [post]
func (h *Handler) LaunchVirtualGame(c *fiber.Ctx) error {

	userID, ok := c.Locals("user_id").(int64)
	if !ok || userID == 0 {
		h.logger.Error("Invalid user ID in context")
		return fiber.NewError(fiber.StatusUnauthorized, "Invalid user identification")
	}

	// companyID, ok := c.Locals("company_id").(int64)
	// if !ok || companyID == 0 {
	// 	h.logger.Error("Invalid company ID in context")
	// 	return fiber.NewError(fiber.StatusUnauthorized, "Invalid company identification")
	// }

	var req launchVirtualGameReq
	if err := c.BodyParser(&req); err != nil {
		h.logger.Error("Failed to parse LaunchVirtualGame request", "error", err)
		return fiber.NewError(fiber.StatusBadRequest, "Invalid request body")
	}

	if valErrs, ok := h.validator.Validate(c, req); !ok {
		return response.WriteJSON(c, fiber.StatusBadRequest, "Invalid request", valErrs, nil)
	}

	url, err := h.virtualGameSvc.GenerateGameLaunchURL(c.Context(), userID, req.GameID, req.Currency, req.Mode)
	if err != nil {
		h.logger.Error("Failed to generate game launch URL", "userID", userID, "gameID", req.GameID, "error", err)
		return fiber.NewError(fiber.StatusInternalServerError, "Failed to launch game")
	}

	res := launchVirtualGameRes{LaunchURL: url}
	return response.WriteJSON(c, fiber.StatusOK, "Game launched successfully", res, nil)
}

// HandleVirtualGameCallback godoc
// @Summary Handle PopOK game callback
// @Description Processes callbacks from PopOK for game events
// @Tags Virtual Games - PopOK
// @Accept json
// @Produce json
// @Param callback body domain.PopOKCallback true "Callback data"
// @Success 200 {object} domain.ErrorResponse
// @Failure 400 {object} domain.ErrorResponse
// @Failure 500 {object} domain.ErrorResponse
// @Router /virtual-game/callback [post]
func (h *Handler) HandleVirtualGameCallback(c *fiber.Ctx) error {
	var callback domain.PopOKCallback
	if err := c.BodyParser(&callback); err != nil {
		h.logger.Error("Failed to parse callback", "error", err)
		return fiber.NewError(fiber.StatusBadRequest, "Invalid callback data")
	}

	if err := h.virtualGameSvc.HandleCallback(c.Context(), &callback); err != nil {
		h.logger.Error("Failed to handle callback", "transactionID", callback.TransactionID, "error", err)
		return fiber.NewError(fiber.StatusInternalServerError, "Failed to process callback")
	}

	return response.WriteJSON(c, fiber.StatusOK, "Callback processed successfully", nil, nil)
}

func (h *Handler) HandlePlayerInfo(c *fiber.Ctx) error {
	var req domain.PopOKPlayerInfoRequest
	if err := c.BodyParser(&req); err != nil {
		return fiber.NewError(fiber.StatusBadRequest, "Invalid request")
	}

	resp, err := h.virtualGameSvc.GetPlayerInfo(c.Context(), &req)
	if err != nil {
		return fiber.NewError(fiber.StatusInternalServerError, err.Error())
	}

	return c.Status(fiber.StatusOK).JSON(resp)
}

func (h *Handler) HandleBet(c *fiber.Ctx) error {
	// Read the raw body to avoid parsing issues
	body := c.Body()
	if len(body) == 0 {
		return c.Status(fiber.StatusBadRequest).JSON(domain.ErrorResponse{
			Message: "Empty request body",
			Error:   "Request body cannot be empty",
		})
	}

	// Try to identify the provider based on the request structure
	provider, err := identifyBetProvider(body)
	if err != nil {
		return c.Status(fiber.StatusBadRequest).JSON(domain.ErrorResponse{
			Message: "Unrecognized request format",
			Error:   err.Error(),
		})
	}

	switch provider {
	case "veli":
		var req domain.BetRequest
		if err := json.Unmarshal(body, &req); err != nil {
			return c.Status(fiber.StatusBadRequest).JSON(domain.ErrorResponse{
				Message: "Invalid Veli bet request",
				Error:   err.Error(),
			})
		}

		res, err := h.veliVirtualGameSvc.ProcessBet(c.Context(), req)
		if err != nil {
			if errors.Is(err, veli.ErrDuplicateTransaction) {
				return c.Status(fiber.StatusConflict).JSON(domain.ErrorResponse{
					Message: "Duplicate transaction",
					Error:   "DUPLICATE_TRANSACTION",
				})
			}
			return c.Status(fiber.StatusBadRequest).JSON(domain.ErrorResponse{
				Message: "Veli bet processing failed",
				Error:   err.Error(),
			})
		}
		return c.JSON(res)

	case "popok":
		var req domain.PopOKBetRequest
		if err := json.Unmarshal(body, &req); err != nil {
			return c.Status(fiber.StatusBadRequest).JSON(domain.ErrorResponse{
				Message: "Invalid PopOK bet request",
				Error:   err.Error(),
			})
		}

		resp, err := h.virtualGameSvc.ProcessBet(c.Context(), &req)
		if err != nil {
			code := fiber.StatusInternalServerError
			switch err.Error() {
			case "invalid token":
				code = fiber.StatusUnauthorized
			case "insufficient balance":
				code = fiber.StatusBadRequest
			}
			return c.Status(code).JSON(domain.ErrorResponse{
				Message: "PopOK bet processing failed",
				Error:   err.Error(),
			})
		}
		return c.JSON(resp)

	default:
		return c.Status(fiber.StatusBadRequest).JSON(domain.ErrorResponse{
			Message: "Unsupported provider",
			Error:   "Request format doesn't match any supported provider",
		})
	}
}

// identifyProvider examines the request body to determine the provider

// WinHandler godoc
// @Summary Handle win callback (Veli or PopOK)
// @Description Processes win callbacks from either Veli or PopOK providers by auto-detecting the format
// @Tags Wins
// @Accept json
// @Produce json
// @Success 200 {object} interface{} "Win processing result"
// @Failure 400 {object} domain.ErrorResponse "Invalid request format"
// @Failure 401 {object} domain.ErrorResponse "Authentication failed"
// @Failure 409 {object} domain.ErrorResponse "Duplicate transaction"
// @Failure 500 {object} domain.ErrorResponse "Internal server error"
// @Router /api/v1/win [post]
func (h *Handler) HandleWin(c *fiber.Ctx) error {
	// Read the raw body to avoid parsing issues
	body := c.Body()
	if len(body) == 0 {
		return c.Status(fiber.StatusBadRequest).JSON(domain.ErrorResponse{
			Message: "Empty request body",
			Error:   "Request body cannot be empty",
		})
	}

	// Try to identify the provider based on the request structure
	provider, err := identifyWinProvider(body)
	if err != nil {
		return c.Status(fiber.StatusBadRequest).JSON(domain.ErrorResponse{
			Message: "Unrecognized request format",
			Error:   err.Error(),
		})
	}

	switch provider {
	case "veli":
		var req domain.WinRequest
		if err := json.Unmarshal(body, &req); err != nil {
			return c.Status(fiber.StatusBadRequest).JSON(domain.ErrorResponse{
				Message: "Invalid Veli win request",
				Error:   err.Error(),
			})
		}

		res, err := h.veliVirtualGameSvc.ProcessWin(c.Context(), req)
		if err != nil {
			if errors.Is(err, veli.ErrDuplicateTransaction) {
				return c.Status(fiber.StatusConflict).JSON(domain.ErrorResponse{
					Message: "Duplicate transaction",
					Error:   "DUPLICATE_TRANSACTION",
				})
			}
			return c.Status(fiber.StatusInternalServerError).JSON(domain.ErrorResponse{
				Message: "Veli win processing failed",
				Error:   err.Error(),
			})
		}
		return c.JSON(res)

	case "popok":
		var req domain.PopOKWinRequest
		if err := json.Unmarshal(body, &req); err != nil {
			return c.Status(fiber.StatusBadRequest).JSON(domain.ErrorResponse{
				Message: "Invalid PopOK win request",
				Error:   err.Error(),
			})
		}

		resp, err := h.virtualGameSvc.ProcessWin(c.Context(), &req)
		if err != nil {
			code := fiber.StatusInternalServerError
			if err.Error() == "invalid token" {
				code = fiber.StatusUnauthorized
			}
			return c.Status(code).JSON(domain.ErrorResponse{
				Message: "PopOK win processing failed",
				Error:   err.Error(),
			})
		}
		return c.JSON(resp)

	default:
		return c.Status(fiber.StatusBadRequest).JSON(domain.ErrorResponse{
			Message: "Unsupported provider",
			Error:   "Request format doesn't match any supported provider",
		})
	}
}

func (h *Handler) HandleCancel(c *fiber.Ctx) error {
	body := c.Body()
	if len(body) == 0 {
		return c.Status(fiber.StatusBadRequest).JSON(domain.ErrorResponse{
			Message: "Empty request body",
			Error:   "Request body cannot be empty",
		})
	}

	provider, err := identifyCancelProvider(body)
	if err != nil {
		return c.Status(fiber.StatusBadRequest).JSON(domain.ErrorResponse{
			Message: "Unrecognized request format",
			Error:   err.Error(),
		})
	}

	switch provider {
	case "veli":
		var req domain.CancelRequest
		if err := json.Unmarshal(body, &req); err != nil {
			return c.Status(fiber.StatusBadRequest).JSON(domain.ErrorResponse{
				Message: "Invalid Veli cancel request",
				Error:   err.Error(),
			})
		}

		res, err := h.veliVirtualGameSvc.ProcessCancel(c.Context(), req)
		if err != nil {
			if errors.Is(err, veli.ErrDuplicateTransaction) {
				return c.Status(fiber.StatusConflict).JSON(domain.ErrorResponse{
					Message: "Duplicate transaction",
					Error:   "DUPLICATE_TRANSACTION",
				})
			}
			return c.Status(fiber.StatusInternalServerError).JSON(domain.ErrorResponse{
				Message: "Veli cancel processing failed",
				Error:   err.Error(),
			})
		}
		return c.JSON(res)

	case "popok":
		var req domain.PopOKCancelRequest
		if err := json.Unmarshal(body, &req); err != nil {
			return c.Status(fiber.StatusBadRequest).JSON(domain.ErrorResponse{
				Message: "Invalid PopOK cancel request",
				Error:   err.Error(),
			})
		}

		resp, err := h.virtualGameSvc.ProcessCancel(c.Context(), &req)
		if err != nil {
			code := fiber.StatusInternalServerError
			switch err.Error() {
			case "invalid token":
				code = fiber.StatusUnauthorized
			case "original bet not found", "invalid original transaction":
				code = fiber.StatusBadRequest
			}
			return c.Status(code).JSON(domain.ErrorResponse{
				Message: "PopOK cancel processing failed",
				Error:   err.Error(),
			})
		}
		return c.JSON(resp)

	default:
		return c.Status(fiber.StatusBadRequest).JSON(domain.ErrorResponse{
			Message: "Unsupported provider",
			Error:   "Request format doesn't match any supported provider",
		})
	}
}

// GetGameList godoc
// @Summary      Get PopOK Games List
// @Description  Retrieves the list of available PopOK slot games
// @Tags Virtual Games - PopOK
// @Accept       json
// @Produce      json
// @Param        currency query string false "Currency (e.g. USD, ETB)" default(USD)
// @Success      200 {array} domain.PopOKGame
// @Failure      500 {object} domain.ErrorResponse
// @Router       /popok/games [get]
func (h *Handler) GetGameList(c *fiber.Ctx) error {
	currency := c.Query("currency", "ETB") // fallback default

	games, err := h.virtualGameSvc.ListGames(c.Context(), currency)
	if err != nil {
		return c.Status(fiber.StatusInternalServerError).JSON(domain.ErrorResponse{
			Message: "Falied to fetch games",
			Error:   err.Error(),
		})
		// return fiber.NewError(fiber.StatusBadGateway, "failed to fetch games")
	}
	return c.JSON(games)
}

// RecommendGames godoc
// @Summary      Recommend virtual games
// @Description  Recommends games based on user history or randomly
// @Tags Virtual Games - PopOK
// @Produce      json
// @Param        user_id query int true "User ID"
// @Success      200 {array} domain.GameRecommendation
// @Failure      500 {object} domain.ErrorResponse
// @Router       /popok/games/recommend [get]
func (h *Handler) RecommendGames(c *fiber.Ctx) error {
	userIDVal := c.Locals("user_id")
	userID, ok := userIDVal.(int64)
	if !ok || userID == 0 {
		return fiber.NewError(fiber.StatusBadRequest, "invalid user ID")
	}

	recommendations, err := h.virtualGameSvc.RecommendGames(c.Context(), userID)
	if err != nil {
		return fiber.NewError(fiber.StatusInternalServerError, "failed to recommend games")
	}

	return c.JSON(recommendations)
}

func (h *Handler) HandleTournamentWin(c *fiber.Ctx) error {
	var req domain.PopOKWinRequest

	if err := c.BodyParser(&req); err != nil {
		h.logger.Error("Invalid tournament win request body", "error", err)
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
			"error": "Invalid request body",
		})
	}

	resp, err := h.virtualGameSvc.ProcessTournamentWin(c.Context(), &req)
	if err != nil {
		h.logger.Error("Failed to process tournament win", "error", err)
		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
			"error": err.Error(),
		})
	}

	return c.JSON(resp)
}

func (h *Handler) HandlePromoWin(c *fiber.Ctx) error {
	var req domain.PopOKWinRequest

	if err := c.BodyParser(&req); err != nil {
		h.logger.Error("Invalid promo win request body", "error", err)
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
			"error": "Invalid request body",
		})
	}

	resp, err := h.virtualGameSvc.ProcessPromoWin(c.Context(), &req)
	if err != nil {
		h.logger.Error("Failed to process promo win", "error", err)
		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
			"error": err.Error(),
		})
	}

	return c.JSON(resp)
}

// AddFavoriteGame godoc
// @Summary      Add game to favorites
// @Description  Adds a game to the user's favorite games list
// @Tags         VirtualGames - Favourites
// @Accept       json
// @Produce      json
// @Param        body  body  domain.FavoriteGameRequest  true  "Game ID to add"
// @Success      201   {string}  domain.Response  "created"
// @Failure      400   {object}  domain.ErrorResponse
// @Failure      500   {object}  domain.ErrorResponse
// @Router       /api/v1/virtual-game/favorites [post]
func (h *Handler) AddFavorite(c *fiber.Ctx) error {
	userID := c.Locals("user_id").(int64)

	var req domain.FavoriteGameRequest
	if err := c.BodyParser(&req); err != nil {
		return fiber.NewError(fiber.StatusBadRequest, "Invalid request")
	}

	err := h.virtualGameSvc.AddFavoriteGame(c.Context(), userID, req.GameID)
	if err != nil {
		return c.Status(fiber.StatusInternalServerError).JSON(domain.ErrorResponse{
			Message: "Could not add favorite",
			Error:   err.Error(),
		})
		// return fiber.NewError(fiber.StatusInternalServerError, "Could not add favorite")
	}
	return c.Status(fiber.StatusCreated).JSON(domain.Response{
		Message:    "Game added to favorites",
		StatusCode: fiber.StatusCreated,
		Success:    true,
	})
	// return c.SendStatus(fiber.StatusCreated)
}

// RemoveFavoriteGame godoc
// @Summary      Remove game from favorites
// @Description  Removes a game from the user's favorites
// @Tags         VirtualGames - Favourites
// @Produce      json
// @Param        gameID  path  int64  true  "Game ID to remove"
// @Success      200  {string}  domain.Response  "removed"
// @Failure      400  {object}  domain.ErrorResponse
// @Failure      500  {object}  domain.ErrorResponse
// @Router       /api/v1/virtual-game/favorites/{gameID} [delete]
func (h *Handler) RemoveFavorite(c *fiber.Ctx) error {
	userID := c.Locals("user_id").(int64)
	gameID, _ := strconv.ParseInt(c.Params("gameID"), 10, 64)

	err := h.virtualGameSvc.RemoveFavoriteGame(c.Context(), userID, gameID)
	if err != nil {
		return fiber.NewError(fiber.StatusInternalServerError, "Could not remove favorite")
	}
	return c.SendStatus(fiber.StatusOK)
}

// ListFavoriteGames godoc
// @Summary      Get user's favorite games
// @Description  Lists the games that the user marked as favorite
// @Tags         VirtualGames - Favourites
// @Produce      json
// @Success      200  {array}  domain.GameRecommendation
// @Failure      500  {object}  domain.ErrorResponse
// @Router       /api/v1/virtual-game/favorites [get]
func (h *Handler) ListFavorites(c *fiber.Ctx) error {
	userID := c.Locals("user_id").(int64)

	games, err := h.virtualGameSvc.ListFavoriteGames(c.Context(), userID)
	if err != nil {
		return fiber.NewError(fiber.StatusInternalServerError, "Could not fetch favorites")
	}
	return c.Status(fiber.StatusOK).JSON(games)
}

func identifyBetProvider(body []byte) (string, error) {
	// Check for Veli signature fields
	var veliCheck struct {
		SessionID string `json:"sessionId"`
		BrandID   string `json:"brandId"`
	}
	if json.Unmarshal(body, &veliCheck) == nil {
		if veliCheck.SessionID != "" && veliCheck.BrandID != "" {
			return "veli", nil
		}
	}

	// Check for PopOK signature fields
	var popokCheck struct {
		Token string `json:"externalToken"`
	}

	if json.Unmarshal(body, &popokCheck) == nil {
		if popokCheck.Token != "" {
			return "popok", nil
		}
	}

	return "", fmt.Errorf("could not identify provider from request structure")
}

// identifyWinProvider examines the request body to determine the provider for win callbacks
func identifyWinProvider(body []byte) (string, error) {
	// Check for Veli signature fields
	var veliCheck struct {
		SessionID string `json:"sessionId"`
		BrandID   string `json:"brandId"`
	}
	if json.Unmarshal(body, &veliCheck) == nil {
		if veliCheck.SessionID != "" && veliCheck.BrandID != "" {
			return "veli", nil
		}
	}

	// Check for PopOK signature fields
	var popokCheck struct {
		Token string `json:"externalToken"`
	}

	if json.Unmarshal(body, &popokCheck) == nil {
		if popokCheck.Token != "" {
			return "popok", nil
		}
	}

	return "", fmt.Errorf("could not identify provider from request structure")
}

func identifyCancelProvider(body []byte) (string, error) {
	// Check for Veli cancel signature
	var veliCheck struct {
		SessionID string `json:"sessionId"`
		BrandID   string `json:"brandId"`
	}
	if json.Unmarshal(body, &veliCheck) == nil {
		if veliCheck.SessionID != "" && veliCheck.BrandID != "" {
			return "veli", nil
		}
	}

	// Check for PopOK cancel signature
	var popokCheck struct {
		Token string `json:"externalToken"`
	}

	if json.Unmarshal(body, &popokCheck) == nil {
		if popokCheck.Token != "" {
			return "popok", nil
		}
	}

	return "", fmt.Errorf("could not identify cancel provider from request structure")
}