package veli

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"net/http"
	"strconv"
	"time"

	"github.com/SamuelTariku/FortuneBet-Backend/internal/config"
	"github.com/SamuelTariku/FortuneBet-Backend/internal/domain"
	"github.com/SamuelTariku/FortuneBet-Backend/internal/ports"
	"github.com/SamuelTariku/FortuneBet-Backend/internal/repository"
	virtualgameservice "github.com/SamuelTariku/FortuneBet-Backend/internal/services/virtualGame"
	"github.com/SamuelTariku/FortuneBet-Backend/internal/services/wallet"
	"github.com/google/uuid"
	"go.uber.org/zap"
)

var (
	ErrPlayerNotFound       = errors.New("PLAYER_NOT_FOUND")
	ErrSessionExpired       = errors.New("SESSION_EXPIRED")
	ErrInsufficientBalance  = errors.New("INSUFFICIENT_BALANCE")
	ErrDuplicateTransaction = errors.New("DUPLICATE_TRANSACTION")
)

type Service struct {
	virtualGameSvc virtualgameservice.VirtualGameService
	repo           repository.VirtualGameRepository
	client         *Client
	walletSvc      *wallet.Service
	transfetStore  ports.TransferStore
	mongoLogger    *zap.Logger
	cfg            *config.Config
}

func New(
	virtualGameSvc virtualgameservice.VirtualGameService,
	repo repository.VirtualGameRepository,
	client *Client,
	walletSvc *wallet.Service,
	transferStore ports.TransferStore,
	mongoLogger *zap.Logger,
	cfg *config.Config,
) *Service {
	return &Service{
		virtualGameSvc: virtualGameSvc,
		repo:           repo,
		client:         client,
		walletSvc:      walletSvc,
		transfetStore:  transferStore,
		mongoLogger:    mongoLogger,
		cfg:            cfg,
	}
}

func (s *Service) GetAtlasVGames(ctx context.Context) ([]domain.AtlasGameEntity, error) {
	// 1. Compose URL (could be configurable)
	url := "https://atlas-v.com/partner/35fr5784dbgr4dfw234wsdsw" +
		"?hash=b3596faa6185180e9b2ca01cb5a052d316511872&timestamp=1700244963080"

	// 2. Create a dedicated HTTP client with timeout
	client := &http.Client{Timeout: 15 * time.Second}

	// 3. Prepare request with context
	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
	if err != nil {
		return nil, fmt.Errorf("creating request: %w", err)
	}

	// 4. Execute request
	resp, err := client.Do(req)
	if err != nil {
		return nil, fmt.Errorf("calling Atlas-V API: %w", err)
	}
	defer resp.Body.Close()

	// 5. Check response status
	if resp.StatusCode != http.StatusOK {
		body, _ := io.ReadAll(resp.Body)
		return nil, fmt.Errorf("Atlas-V API error: status %d, body: %s", resp.StatusCode, body)
	}

	// 6. Decode response into slice of GameEntity
	var games []domain.AtlasGameEntity
	if err := json.NewDecoder(resp.Body).Decode(&games); err != nil {
		return nil, fmt.Errorf("decoding Atlas-V games: %w", err)
	}

	return games, nil
}

func (s *Service) GetProviders(ctx context.Context, req domain.ProviderRequest) (*domain.ProviderResponse, error) {
	// Always mirror request body fields into sigParams
	sigParams := map[string]any{
		"brandId": req.BrandID,
	}

	// Optional fields
	sigParams["extraData"] = fmt.Sprintf("%t", req.ExtraData) // false is still included
	if req.Size > 0 {
		sigParams["size"] = fmt.Sprintf("%d", req.Size)
	} else {
		sigParams["size"] = "" // keep empty if not set
	}
	if req.Page > 0 {
		sigParams["page"] = fmt.Sprintf("%d", req.Page)
	} else {
		sigParams["page"] = ""
	}

	var res domain.ProviderResponse
	err := s.client.Post(ctx, "/game-lists/public/providers", req, sigParams, &res)
	return &res, err
}

func (s *Service) GetGames(ctx context.Context, req domain.GameListRequest) ([]domain.GameEntity, error) {
	// 1. Check if provider is enabled in DB
	// provider, err := s.repo.GetVirtualGameProviderByID(ctx, req.ProviderID)
	// if err != nil {
	// 	return nil, fmt.Errorf("failed to check provider %s: %w", req.ProviderID, err)
	// }

	// if !provider.Enabled {
	// 	// Provider exists but is disabled → return empty list (or error if you prefer)
	// 	return nil, fmt.Errorf("provider %s is disabled", req.ProviderID)
	// }

	// 2. Prepare signature params
	sigParams := map[string]any{
		"brandId":    req.BrandID,
		"providerId": req.ProviderID,
		"size":       req.Size,
		"page":       req.Page,
	}

	// 3. Call external API
	var res struct {
		Items []domain.GameEntity `json:"items"`
	}
	if err := s.client.Post(ctx, "/game-lists/public/games", req, sigParams, &res); err != nil {
		return nil, fmt.Errorf("failed to fetch games for provider %s: %w", req.ProviderID, err)
	}

	return res.Items, nil
}

func (s *Service) StartGame(ctx context.Context, req domain.GameStartRequest) (*domain.GameStartResponse, error) {
	// 1. Check if provider is enabled in DB
	// provider, err := s.repo.GetVirtualGameProviderByID(ctx, req.ProviderID)
	// if err != nil {
	// 	return nil, fmt.Errorf("failed to check provider %s: %w", req.ProviderID, err)
	// }

	// if !provider.Enabled {
	// 	// Provider exists but is disabled → return error
	// 	return nil, fmt.Errorf("provider %s is disabled", req.ProviderID)
	// }

	// 2. Prepare signature params
	sigParams := map[string]any{
		"sessionId":  req.SessionID,
		"providerId": req.ProviderID,
		"gameId":     req.GameID,
		"language":   req.Language,
		"playerId":   req.PlayerID,
		"currency":   req.Currency,
		"deviceType": req.DeviceType,
		"country":    req.Country,
		"ip":         req.IP,
		"brandId":    req.BrandID,
	}

	// 3. Call external API
	var res domain.GameStartResponse
	if err := s.client.Post(ctx, "/unified-api/public/start-game", req, sigParams, &res); err != nil {
		return nil, fmt.Errorf("failed to start game with provider %s: %w", req.ProviderID, err)
	}

	playerIDInt64, err := strconv.ParseInt(req.PlayerID, 10, 64)
	if err != nil {
		return nil, fmt.Errorf("invalid PlayerID: %w", err)
	}

	session := &domain.VirtualGameSession{
		UserID:       playerIDInt64,
		GameID:       req.GameID,
		SessionToken: uuid.NewString(),
	}

	if err := s.repo.CreateVirtualGameSession(ctx, session); err != nil {
		return nil, fmt.Errorf("failed to create virtual game session: %w", err)
	}

	return &res, nil
}

func (s *Service) StartDemoGame(ctx context.Context, req domain.DemoGameRequest) (*domain.GameStartResponse, error) {
	// 1. Check if provider is enabled in DB
	// provider, err := s.repo.GetVirtualGameProviderByID(ctx, req.ProviderID)
	// if err != nil {
	// 	return nil, fmt.Errorf("failed to check provider %s: %w", req.ProviderID, err)
	// }

	// if !provider.Enabled {
	// 	// Provider exists but is disabled → return error
	// 	return nil, fmt.Errorf("provider %s is disabled", req.ProviderID)
	// }

	// 2. Prepare signature params
	sigParams := map[string]any{
		"providerId": req.ProviderID,
		"gameId":     req.GameID,
		"language":   req.Language,
		"deviceType": req.DeviceType,
		"ip":         req.IP,
		"brandId":    req.BrandID,
	}

	// 3. Call external API
	var res domain.GameStartResponse
	if err := s.client.Post(ctx, "/unified-api/public/start-demo-game", req, sigParams, &res); err != nil {
		return nil, fmt.Errorf("failed to start demo game with provider %s: %w", req.ProviderID, err)
	}

	return &res, nil
}

func (s *Service) GetBalance(ctx context.Context, req domain.BalanceRequest) (*domain.BalanceResponse, error) {
	// Retrieve player's real balance from wallet Service
	playerIDInt64, err := strconv.ParseInt(req.PlayerID, 10, 64)
	if err != nil {
		return nil, fmt.Errorf("invalid PlayerID: %w", err)
	}
	// playerWallets, err := s.walletSvc.GetWalletsByUser(ctx, playerIDInt64)
	// if err != nil {
	// 	return nil, fmt.Errorf("failed to get real balance: %w", err)
	// }
	// if len(playerWallets) == 0 {
	// 	return nil, fmt.Errorf("PLAYER_NOT_FOUND: no wallet found for player %s", req.PlayerID)
	// }

	wallet, err := s.walletSvc.GetCustomerWallet(ctx, playerIDInt64)
	if err != nil {
		return nil, fmt.Errorf("failed to read user wallets")
	}

	// realBalance := playerWallets[0].Balance

	// Retrieve bonus balance if applicable
	// var bonusBalance float64
	// bonusBalance := float64(wallet.StaticBalance)

	// Build the response
	res := &domain.BalanceResponse{
		Real: struct {
			Currency string  `json:"currency"`
			Amount   float64 `json:"amount"`
		}{
			Currency: req.Currency,
			Amount:   (float64(wallet.RegularBalance.Float32())),
		},
	}

	// if bonusBalance > 0 {
	// 	res.Bonus = &struct {
	// 		Currency string  `json:"currency"`
	// 		Amount   float64 `json:"amount"`
	// 	}{
	// 		Currency: req.Currency,
	// 		Amount:   bonusBalance,
	// 	}
	// }

	return res, nil
}

func (s *Service) ProcessBet(ctx context.Context, req domain.BetRequest) (*domain.BetResponse, error) {
	// --- 1. Validate PlayerID ---
	playerIDInt64, err := strconv.ParseInt(req.PlayerID, 10, 64)
	if err != nil {
		return nil, fmt.Errorf("BAD_REQUEST: invalid PlayerID %s", req.PlayerID)
	}

	wallet, err := s.walletSvc.GetCustomerWallet(ctx, playerIDInt64)
	if err != nil {
		return nil, fmt.Errorf("failed to read user wallets")
	}


	bonusBalance := float64(wallet.StaticBalance.Float32())

	// --- 4. Check sufficient balance ---
	if float64(wallet.RegularBalance.Float32()) < req.Amount.Amount {
		return nil, fmt.Errorf("INSUFFICIENT_BALANCE")
	}

	// --- 6. Persist wallet deductions ---

	_, err = s.walletSvc.DeductFromWallet(ctx, wallet.RegularID,
		domain.ToCurrency(float32(req.Amount.Amount)),
		domain.ValidInt64{},
		domain.TRANSFER_DIRECT,
		fmt.Sprintf("Deduct amount %.2f for bet %s", req.Amount.Amount, req.TransactionID),
	)
	if err != nil {
		return nil, fmt.Errorf("bonus deduction failed: %w", err)
	}

	// --- 7. Build response ---
	res := &domain.BetResponse{
		Real: domain.BalanceDetail{
			Currency: req.Amount.Currency,
			Amount:   float64(wallet.RegularBalance.Float32()) - req.Amount.Amount,
		},
		WalletTransactionID: req.TransactionID,
		UsedRealAmount:      req.Amount.Amount,
		UsedBonusAmount:     0,
	}

	if bonusBalance > 0 {
		res.Bonus = &domain.BalanceDetail{
			Currency: req.Amount.Currency,
			Amount:   bonusBalance,
		}
	}

	return res, nil
}

func (s *Service) ProcessWin(ctx context.Context, req domain.WinRequest) (*domain.WinResponse, error) {
	// --- 1. Validate PlayerID ---
	playerIDInt64, err := strconv.ParseInt(req.PlayerID, 10, 64)
	if err != nil {
		return nil, fmt.Errorf("BAD_REQUEST: invalid PlayerID %s", req.PlayerID)
	}

	// --- 2. Get player wallets ---
	wallet, err := s.walletSvc.GetCustomerWallet(ctx, playerIDInt64)
	if err != nil {
		return nil, fmt.Errorf("failed to read user wallets")
	}

	// --- 3. Convert balances safely using Float32() ---
	realBalance := float64(wallet.RegularBalance.Float32())
	bonusBalance := float64(wallet.StaticBalance.Float32())

	// --- 4. Apply winnings ---
	winAmount := req.Amount.Amount
	usedReal := winAmount
	usedBonus := 0.0

	// Future extension: split winnings between bonus and real wallets if needed
	_, err = s.walletSvc.AddToWallet(
		ctx,
		wallet.RegularID,
		domain.ToCurrency(float32(winAmount)),
		domain.ValidInt64{},
		domain.TRANSFER_DIRECT,
		domain.PaymentDetails{},
		fmt.Sprintf("Win %.2f for transaction %s", winAmount, req.TransactionID),
	)
	if err != nil {
		return nil, fmt.Errorf("failed to credit real wallet: %w", err)
	}

	// --- 5. Build response ---
	res := &domain.WinResponse{
		Real: domain.BalanceDetail{
			Currency: req.Amount.Currency,
			Amount:   realBalance + winAmount, // reflect the credited win amount
		},
		WalletTransactionID: req.TransactionID,
		UsedRealAmount:      usedReal,
		UsedBonusAmount:     usedBonus,
	}

	if bonusBalance > 0 {
		res.Bonus = &domain.BalanceDetail{
			Currency: req.Amount.Currency,
			Amount:   bonusBalance,
		}
	}

	return res, nil
}

func (s *Service) ProcessCancel(ctx context.Context, req domain.CancelRequest) (*domain.CancelResponse, error) {
	// --- 1. Validate PlayerID ---
	playerIDInt64, err := strconv.ParseInt(req.PlayerID, 10, 64)
	if err != nil {
		return nil, fmt.Errorf("BAD_REQUEST: invalid PlayerID %q", req.PlayerID)
	}

	// --- 2. Get player wallets ---
	wallet, err := s.walletSvc.GetCustomerWallet(ctx, playerIDInt64)
	if err != nil {
		return nil, fmt.Errorf("failed to read user wallets")
	}

	// --- 3. Convert balances using Float32() ---
	realBalance := float64(wallet.RegularBalance.Float32())
	bonusBalance := float64(wallet.StaticBalance.Float32())

	// --- 4. Determine refund amount ---
	var refundAmount float64
	if req.IsAdjustment {
		if req.AdjustmentRefund.Amount <= 0 {
			return nil, fmt.Errorf("missing adjustmentRefund for adjustment cancel")
		}
		refundAmount = req.AdjustmentRefund.Amount
	} else {
		originalTransfer, err := s.transfetStore.GetTransferByReference(ctx, req.RefTransactionID)
		if err != nil {
			return nil, fmt.Errorf("failed to get original bet for cancellation: %w", err)
		}
		refundAmount = float64(originalTransfer.Amount)
	}

	// --- 5. Refund to wallet ---
	usedReal := refundAmount
	usedBonus := 0.0

	_, err = s.walletSvc.AddToWallet(
		ctx,
		wallet.RegularID,
		domain.ToCurrency(float32(refundAmount)),
		domain.ValidInt64{},
		domain.TRANSFER_DIRECT,
		domain.PaymentDetails{
			ReferenceNumber: domain.ValidString{
				Value: req.TransactionID,
				Valid: true,
			},
			BankNumber: domain.ValidString{},
		},
		fmt.Sprintf("Cancel %s refunded %.2f for transaction %s", req.CancelType, refundAmount, req.RefTransactionID),
	)
	if err != nil {
		return nil, fmt.Errorf("failed to refund wallet: %w", err)
	}

	// --- 6. Build response ---
	res := &domain.CancelResponse{
		WalletTransactionID: req.TransactionID,
		Real: domain.BalanceDetail{
			Currency: req.AdjustmentRefund.Currency,
			Amount:   realBalance + refundAmount, // reflect refunded balance
		},
		UsedRealAmount:  usedReal,
		UsedBonusAmount: usedBonus,
	}

	if bonusBalance > 0 {
		res.Bonus = &domain.BalanceDetail{
			Currency: req.AdjustmentRefund.Currency,
			Amount:   bonusBalance,
		}
	}

	return res, nil
}

func (s *Service) GetGamingActivity(ctx context.Context, req domain.GamingActivityRequest) (*domain.GamingActivityResponse, error) {
	// --- Signature Params (flattened strings for signing) ---
	sigParams := map[string]any{
		"fromDate": req.FromDate,
		"toDate":   req.ToDate,
		"brandId":  s.cfg.VeliGames.BrandID,
	}

	// Optional filters
	if req.ProviderID != "" {
		sigParams["providerId"] = req.ProviderID
	}
	if len(req.PlayerIDs) > 0 {
		sigParams["playerIds"] = req.PlayerIDs // pass as []string, not joined
	}
	if len(req.GameIDs) > 0 {
		sigParams["gameIds"] = req.GameIDs // pass as []string
	}
	if len(req.Currencies) > 0 {
		sigParams["currencies"] = req.Currencies // pass as []string
	}
	if req.Page > 0 {
		sigParams["page"] = req.Page
	} else {
		sigParams["page"] = 1
		req.Page = 1
	}
	if req.Size > 0 {
		sigParams["size"] = req.Size
	} else {
		sigParams["size"] = 100
		req.Size = 100
	}
	if req.ExcludeFreeWin != nil {
		sigParams["excludeFreeWin"] = *req.ExcludeFreeWin
	}

	// --- Actual API Call ---
	var res domain.GamingActivityResponse
	err := s.client.Post(ctx, "/report-api/public/gaming-activity", req, sigParams, &res)
	if err != nil {
		return nil, err
	}

	// --- Return parsed response ---
	return &res, nil
}

func (s *Service) GetHugeWins(ctx context.Context, req domain.HugeWinsRequest) (*domain.HugeWinsResponse, error) {
	// --- Signature Params (flattened strings for signing) ---
	sigParams := map[string]any{
		"fromDate": req.FromDate,
		"toDate":   req.ToDate,
		"brandId":  req.BrandID,
	}

	if req.ProviderID != "" {
		sigParams["providerId"] = req.ProviderID
	}
	if len(req.GameIDs) > 0 {
		sigParams["gameIds"] = req.GameIDs // pass slice directly
	}
	if len(req.Currencies) > 0 {
		sigParams["currencies"] = req.Currencies // pass slice directly
	}
	if req.Page > 0 {
		sigParams["page"] = req.Page
	} else {
		sigParams["page"] = 1
		req.Page = 1
	}
	if req.Size > 0 {
		sigParams["size"] = req.Size
	} else {
		sigParams["size"] = 100
		req.Size = 100
	}

	// --- Actual API Call ---
	var res domain.HugeWinsResponse
	err := s.client.Post(ctx, "/report-api/public/gaming-activity/huge-wins", req, sigParams, &res)
	if err != nil {
		return nil, err
	}

	return &res, nil
}

func (s *Service) GetCreditBalances(ctx context.Context, brandID string) ([]domain.CreditBalance, error) {
	if brandID == "" {
		return nil, fmt.Errorf("brandID cannot be empty")
	}

	// Prepare request body
	body := map[string]any{
		"brandId": brandID,
	}

	// Call the VeliGames API
	var res struct {
		Credits []domain.CreditBalance `json:"credits"`
	}

	if err := s.client.Post(ctx, "/report-api/public/credit/balances", body, nil, &res); err != nil {
		return nil, fmt.Errorf("failed to fetch credit balances: %w", err)
	}

	return res.Credits, nil
}