package handlers

import (
	"encoding/json"
	"fmt"
	"strings"

	"github.com/SamuelTariku/FortuneBet-Backend/internal/domain"
	"github.com/gofiber/fiber/v2"
)

// InitiateDeposit godoc
// @Summary Initiate a deposit
// @Description Starts a new deposit process using Chapa payment gateway
// @Tags Chapa
// @Accept json
// @Produce json
// @Security ApiKeyAuth
// @Param request body domain.ChapaDepositRequestPayload true "Deposit request"
// @Success 200 {object} domain.ChapaDepositResponse
// @Failure 400 {object} domain.ErrorResponse
// @Failure 500 {object} domain.ErrorResponse
// @Router /api/v1/chapa/payments/deposit [post]
func (h *Handler) InitiateDeposit(c *fiber.Ctx) error {
	// Get user ID from context (set by your auth middleware)
	userID, ok := c.Locals("user_id").(int64)
	if !ok {
		return c.Status(fiber.StatusBadRequest).JSON(domain.ErrorResponse{
			Error:   "invalid user ID",
			Message: "User ID is required to initiate a deposit",
		})
	}

	var req domain.ChapaDepositRequestPayload

	if err := c.BodyParser(&req); err != nil {
		// fmt.Println("We first first are here init Chapa payment")
		return c.Status(fiber.StatusBadRequest).JSON(domain.ErrorResponse{
			Error:   err.Error(),
			Message: "Failed to parse request body",
		})
	}

	amount := domain.Currency(req.Amount)

	fmt.Println("We are here init Chapa payment")

	checkoutURL, err := h.chapaSvc.InitiateDeposit(c.Context(), userID, amount)
	if err != nil {
		return c.Status(fiber.StatusInternalServerError).JSON(domain.ErrorResponse{
			Error:   err.Error(),
			Message: "Failed to initiate Chapa deposit",
		})
	}

	return c.Status(fiber.StatusOK).JSON(domain.Response{
		Message:    "Chapa deposit process initiated successfully",
		Data:       checkoutURL,
		StatusCode: 200,
		Success:    true,
	})
}

// WebhookCallback godoc
// @Summary Chapa payment webhook callback (used by Chapa)
// @Description Handles payment and transfer notifications from Chapa
// @Tags Chapa
// @Accept json
// @Produce json
// @Param request body domain.ChapaWebhookPayment true "Webhook payload"
// @Success 200 {object} domain.Response
// @Failure 400 {object} domain.ErrorResponse
// @Failure 500 {object} domain.ErrorResponse
// @Router /api/v1/chapa/payments/webhook/verify [post]
func (h *Handler) WebhookCallback(c *fiber.Ctx) error {
	body := c.Body()

	// Retrieve signature headers
	chapaSignature := c.Get("chapa-signature")
	xChapaSignature := c.Get("x-chapa-signature")

	// Verify webhook signature
	valid, err := h.chapaSvc.VerifyWebhookSignature(c.Context(), body, chapaSignature, xChapaSignature)
	if err != nil || !valid {
		return c.Status(fiber.StatusBadRequest).JSON(domain.ErrorResponse{
			Message: "Invalid Chapa webhook signature",
			Error:   err.Error(),
		})
	}

	// Try parsing as transfer webhook first
	var transfer domain.ChapaWebhookTransfer
	if err := json.Unmarshal(body, &transfer); err == nil &&
		strings.EqualFold(transfer.Type, "payout") {

		if err := h.chapaSvc.ProcessVerifyWithdrawWebhook(c.Context(), transfer); err != nil {
			return domain.UnExpectedErrorResponse(c)
		}

		return c.Status(fiber.StatusOK).JSON(domain.Response{
			StatusCode: 200,
			Message:    "Chapa withdrawal webhook processed successfully",
			// Data:       transfer,
			Success:    true,
		})
	}

	// Otherwise, try as payment webhook
	var payment domain.ChapaWebhookPayment
	if err := json.Unmarshal(body, &payment); err != nil {
		return domain.UnProcessableEntityResponse(c)
	}

	if err := h.chapaSvc.ProcessVerifyDepositWebhook(c.Context(), payment); err != nil {
		return c.Status(fiber.StatusInternalServerError).JSON(domain.ErrorResponse{
			Message: "Failed to verify Chapa deposit",
			Error:   err.Error(),
		})
	}

	return c.Status(fiber.StatusOK).JSON(domain.Response{
		StatusCode: 200,
		Message:    "Chapa deposit webhook processed successfully",
		// Data:       payment,
		Success:    true,
	})
}

// CancelDeposit godoc
// @Summary Cancel a Chapa deposit transaction
// @Description Cancels an active Chapa transaction using its transaction reference
// @Tags Chapa
// @Accept json
// @Produce json
// @Security ApiKeyAuth
// @Param tx_ref path string true "Transaction Reference"
// @Success 200 {object} domain.ChapaCancelResponse
// @Failure 400 {object} domain.ErrorResponse
// @Failure 404 {object} domain.ErrorResponse
// @Failure 500 {object} domain.ErrorResponse
// @Router /api/v1/chapa/transaction/cancel/{tx_ref} [put]
func (h *Handler) CancelDeposit(c *fiber.Ctx) error {
	// Get user ID from context (set by your auth middleware)
	userID, ok := c.Locals("user_id").(int64)
	if !ok {
		return c.Status(fiber.StatusBadRequest).JSON(domain.ErrorResponse{
			Error:   "invalid user ID",
			Message: "User ID is required to cancel a deposit",
		})
	}

	// Extract tx_ref from URL path
	txRef := c.Params("tx_ref")
	if txRef == "" {
		return c.Status(fiber.StatusBadRequest).JSON(domain.ErrorResponse{
			Error:   "missing transaction reference",
			Message: "Transaction reference is required in the path",
		})
	}

	fmt.Printf("\n\nReceived request to cancel Chapa transaction: %s (User ID: %d)\n\n", txRef, userID)

	// Call the service layer to cancel deposit
	cancelResp, err := h.chapaSvc.CancelDeposit(c.Context(), userID, txRef)
	if err != nil {
		return c.Status(fiber.StatusInternalServerError).JSON(domain.ErrorResponse{
			Error:   err.Error(),
			Message: "Failed to cancel Chapa deposit",
		})
	}

	return c.Status(fiber.StatusOK).JSON(domain.Response{
		Message:    "Chapa transaction cancelled successfully",
		Data:       cancelResp,
		StatusCode: 200,
		Success:    true,
	})
}

// FetchAllTransactions godoc
// @Summary Get all Chapa transactions
// @Description Retrieves all transactions from Chapa payment gateway
// @Tags Chapa
// @Accept json
// @Produce json
// @Security ApiKeyAuth
// @Success 200 {array} domain.ChapaTransaction
// @Failure 500 {object} domain.ErrorResponse
// @Router /api/v1/chapa/transactions [get]
func (h *Handler) FetchAllTransactions(c *fiber.Ctx) error {
	transactions, err := h.chapaSvc.FetchAllTransactions(c.Context())
	if err != nil {
		return c.Status(fiber.StatusInternalServerError).JSON(domain.ErrorResponse{
			Error:   err.Error(),
			Message: "Failed to fetch Chapa transactions",
		})
	}

	return c.Status(fiber.StatusOK).JSON(domain.Response{
		Message:    "Chapa transactions retrieved successfully",
		Data:       transactions,
		StatusCode: 200,
		Success:    true,
	})
}

// GetTransactionEvents godoc
// @Summary Fetch transaction events
// @Description Retrieve the timeline of events for a specific Chapa transaction
// @Tags Chapa
// @Accept json
// @Produce json
// @Param ref_id path string true "Transaction Reference"
// @Success 200 {array} domain.ChapaTransactionEvent
// @Failure 400 {object} domain.ErrorResponse
// @Failure 500 {object} domain.ErrorResponse
// @Router /api/v1/chapa/transaction/events/{ref_id} [get]
func (h *Handler) GetTransactionEvents(c *fiber.Ctx) error {
	refID := c.Params("ref_id")
	if refID == "" {
		return c.Status(fiber.StatusBadRequest).JSON(domain.ErrorResponse{
			Message: "Failed to fetch transaction events",
			Error:   "Transaction reference is required",
		})
	}

	events, err := h.chapaSvc.FetchTransactionEvents(c.Context(), refID)
	if err != nil {
		return c.Status(fiber.StatusInternalServerError).JSON(domain.ErrorResponse{
			Message: "Failed to fetch transaction events",
			Error:   err.Error(),
		})
	}

	return c.Status(fiber.StatusOK).JSON(domain.Response{
		Message:    "Transaction events fetched successfully",
		Data:       events,
		StatusCode: 200,
		Success:    true,
	})
}

// VerifyPayment godoc
// @Summary Verify a payment manually
// @Description Manually verify a payment using Chapa's API
// @Tags Chapa
// @Accept json
// @Produce json
// @Param tx_ref path string true "Transaction Reference"
// @Success 200 {object} domain.Response
// @Failure 400 {object} domain.ErrorResponse
// @Failure 500 {object} domain.ErrorResponse
// @Router /api/v1/chapa/transaction/manual/verify/{tx_ref} [get]
func (h *Handler) ManualVerifyTransaction(c *fiber.Ctx) error {
	txRef := c.Params("tx_ref")
	if txRef == "" {
		return c.Status(fiber.StatusBadRequest).JSON(domain.ErrorResponse{
			Message: "Failed to verify Chapa transaction",
			Error:   "Transaction reference is required",
		})
	}

	verification, err := h.chapaSvc.ManuallyVerify(c.Context(), txRef)
	if err != nil {
		return c.Status(fiber.StatusInternalServerError).JSON(domain.ErrorResponse{
			Message: "Failed to verify Chapa transaction",
			Error:   err.Error(),
		})
	}

	return c.Status(fiber.StatusOK).JSON(domain.Response{
		Message:    "Chapa transaction verified successfully",
		Data:       verification,
		StatusCode: 200,
		Success:    true,
	})
}

// GetSupportedBanks godoc
// @Summary Get supported banks
// @Description Get list of banks supported by Chapa
// @Tags Chapa
// @Accept json
// @Produce json
// @Success 200 {object} domain.Response
// @Failure 500 {object} domain.ErrorResponse
// @Router /api/v1/chapa/banks [get]
func (h *Handler) GetSupportedBanks(c *fiber.Ctx) error {
	banks, err := h.chapaSvc.GetSupportedBanks(c.Context())
	if err != nil {
		return c.Status(fiber.StatusInternalServerError).JSON(domain.ErrorResponse{
			Error:   err.Error(),
			Message: "Failed to fetch banks",
		})
	}

	return c.Status(fiber.StatusOK).JSON(domain.Response{
		Message:    "Banks fetched successfully",
		StatusCode: 200,
		Success:    true,
		Data:       banks,
	})
}

// InitiateWithdrawal initiates a withdrawal request via Chapa payment gateway
// @Summary Initiate a withdrawal
// @Description Initiates a withdrawal request to transfer funds to a bank account via Chapa
// @Tags Chapa
// @Accept json
// @Produce json
// @Security ApiKeyAuth
// @Param request body domain.ChapaWithdrawalRequest true "Withdrawal request details"
// @Success 200 {object} domain.Response "Chapa withdrawal process initiated successfully"
// @Failure 400 {object} domain.ErrorResponse "Invalid request body"
// @Failure 401 {object} domain.ErrorResponse "Unauthorized"
// @Failure 422 {object} domain.ErrorResponse "Unprocessable entity"
// @Failure 500 {object} domain.ErrorResponse "Internal server error"
// @Router /api/v1/chapa/payments/withdraw [post]
func (h *Handler) InitiateWithdrawal(c *fiber.Ctx) error {
	userID, ok := c.Locals("user_id").(int64)
	if !ok {
		return domain.UnProcessableEntityResponse(c)
	}

	var req domain.ChapaWithdrawalRequest
	if err := c.BodyParser(&req); err != nil {
		return domain.UnProcessableEntityResponse(c)
	}

	withdrawal, err := h.chapaSvc.InitiateWithdrawal(c.Context(), userID, req)
	if err != nil {
		return c.Status(fiber.StatusInternalServerError).JSON(domain.ErrorResponse{
			Message: "Failed to initiate Chapa withdrawal",
			Error:   err.Error(),
		})
	}

	return c.Status(fiber.StatusOK).JSON(domain.Response{
		Message:    "Chapa withdrawal process initiated successfully",
		StatusCode: 200,
		Success:    true,
		Data:       withdrawal,
	})
}

// GetPaymentReceipt godoc
// @Summary Get Chapa Payment Receipt URL
// @Description Retrieve the Chapa payment receipt URL using the reference ID
// @Tags Chapa
// @Accept json
// @Produce json
// @Param chapa_ref path string true "Chapa Reference ID"
// @Success 200 {object} domain.Response
// @Failure 400 {object} domain.ErrorResponse
// @Failure 500 {object} domain.ErrorResponse
// @Router /api/v1/chapa/payments/receipt/{chapa_ref} [get]
func (h *Handler) GetPaymentReceipt(c *fiber.Ctx) error {
	chapaRef := c.Params("chapa_ref")
	if chapaRef == "" {
		return c.Status(fiber.StatusBadRequest).JSON(domain.ErrorResponse{
			Message: "Failed to get Chapa payment receipt",
			Error:   "Chapa reference ID is required",
		})
	}

	receiptURL, err := h.chapaSvc.GetPaymentReceiptURL(chapaRef)
	if err != nil {
		return c.Status(fiber.StatusInternalServerError).JSON(domain.ErrorResponse{
			Message: "Failed to get Chapa payment receipt",
			Error:   err.Error(),
		})
	}

	return c.Status(fiber.StatusOK).JSON(domain.Response{
		Message:    "Payment receipt URL generated successfully",
		Data:       receiptURL,
		StatusCode: 200,
		Success:    true,
	})
}

// GetAllTransfers godoc
// @Summary Get all Chapa transfers
// @Description Retrieve all transfer records from Chapa
// @Tags Chapa
// @Accept json
// @Produce json
// @Success 200 {object} domain.Response
// @Failure 400 {object} domain.ErrorResponse
// @Failure 500 {object} domain.ErrorResponse
// @Router /api/v1/chapa/transfers [get]
func (h *Handler) GetAllTransfers(c *fiber.Ctx) error {
	transfers, err := h.chapaSvc.GetAllTransfers(c.Context())
	if err != nil {
		return c.Status(fiber.StatusInternalServerError).JSON(domain.ErrorResponse{
			Message: "Failed to fetch Chapa transfers",
			Error:   err.Error(),
		})
	}

	return c.Status(fiber.StatusOK).JSON(domain.Response{
		Message:    "Chapa transfers retrieved successfully",
		Data:       transfers,
		StatusCode: fiber.StatusOK,
		Success:    true,
	})
}

// GetAccountBalance godoc
// @Summary Get Chapa account balance
// @Description Retrieve Chapa account balance, optionally filtered by currency code (e.g., ETB, USD)
// @Tags Chapa
// @Accept json
// @Produce json
// @Param currency_code query string false "Currency code (optional)"
// @Success 200 {object} domain.Response
// @Failure 400 {object} domain.ErrorResponse
// @Failure 500 {object} domain.ErrorResponse
// @Router /api/v1/chapa/balances [get]
func (h *Handler) GetAccountBalance(c *fiber.Ctx) error {
	currencyCode := c.Query("currency_code", "")

	balances, err := h.chapaSvc.GetAccountBalance(c.Context(), currencyCode)
	if err != nil {
		return c.Status(fiber.StatusInternalServerError).JSON(domain.ErrorResponse{
			Message: "Failed to fetch Chapa account balance",
			Error:   err.Error(),
		})
	}

	return c.Status(fiber.StatusOK).JSON(domain.Response{
		Message:    "Chapa account balances retrieved successfully",
		Data:       balances,
		StatusCode: fiber.StatusOK,
		Success:    true,
	})
}

// SwapCurrency godoc
// @Summary Swap currency using Chapa API
// @Description Convert an amount from one currency to another using Chapa's currency swap API
// @Tags Chapa
// @Accept json
// @Produce json
// @Param request body domain.SwapRequest true "Swap request payload"
// @Success 200 {object} domain.Response
// @Failure 400 {object} domain.ErrorResponse
// @Failure 500 {object} domain.ErrorResponse
// @Router /api/v1/chapa/swap [post]
func (h *Handler) SwapCurrency(c *fiber.Ctx) error {
	var reqBody domain.SwapRequest

	// Parse request body
	if err := c.BodyParser(&reqBody); err != nil {
		return c.Status(fiber.StatusBadRequest).JSON(domain.ErrorResponse{
			Message: "Invalid request payload",
			Error:   err.Error(),
		})
	}

	// Validate input
	if reqBody.From == "" || reqBody.To == "" || reqBody.Amount <= 0 {
		return c.Status(fiber.StatusBadRequest).JSON(domain.ErrorResponse{
			Message: "Missing or invalid swap parameters",
			Error:   "from, to, and amount are required fields",
		})
	}

	// Call service
	resp, err := h.chapaSvc.SwapCurrency(c.Context(), reqBody)
	if err != nil {
		return c.Status(fiber.StatusInternalServerError).JSON(domain.ErrorResponse{
			Message: "Failed to perform currency swap",
			Error:   err.Error(),
		})
	}

	// Success response
	return c.Status(fiber.StatusOK).JSON(domain.Response{
		Message:    "Currency swapped successfully",
		Data:       resp,
		StatusCode: fiber.StatusOK,
		Success:    true,
	})
}