package arifpay

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

	"github.com/AnaniyaBelew/ArifpayGoPlugin"
	"github.com/SamuelTariku/FortuneBet-Backend/internal/config"
	"github.com/SamuelTariku/FortuneBet-Backend/internal/domain"
	"github.com/SamuelTariku/FortuneBet-Backend/internal/services/wallet"
	"github.com/google/uuid"
)

type ArifpayService struct {
	cfg           *config.Config
	transferStore wallet.TransferStore
	httpClient    *http.Client
}

func NewArifpayService(cfg *config.Config, transferStore wallet.TransferStore, httpClient *http.Client) *ArifpayService {
	return &ArifpayService{
		cfg:           cfg,
		transferStore: transferStore,
		httpClient:    httpClient,
	}
}

func (s *ArifpayService) CreateCheckoutSession(req domain.CreateCheckoutSessionRequest) (string, error) {
	// Create SDK-compatible payload
	paymentPayload := ArifpayGoPlugin.PaymentRequest{
		CancelUrl:      s.cfg.ARIFPAY.CancelUrl,
		Phone:          req.Phone,
		Email:          req.Email,
		Nonce:          req.Nonce,
		ErrorUrl:       s.cfg.ARIFPAY.ErrorUrl,
		NotifyUrl:      s.cfg.ARIFPAY.NotifyUrl,
		SuccessUrl:     s.cfg.ARIFPAY.SuccessUrl,
		PaymentMethods: req.PaymentMethods,
		Lang:           req.Lang,
	}

	// Convert items
	for _, item := range req.Items {
		paymentPayload.Items = append(paymentPayload.Items, domain.Item{
			Name:        item.Name,
			Quantity:    item.Quantity,
			Price:       item.Price,
			Description: item.Description,
			Image:       item.Image,
		})
	}

	// Convert beneficiaries
	for _, b := range req.Beneficiaries {
		paymentPayload.Beneficiaries = append(paymentPayload.Beneficiaries, domain.Beneficiary{
			AccountNumber: b.AccountNumber,
			Bank:          b.Bank,
			Amount:        b.Amount,
		})
	}

	// Instantiate payment client
	expireDate := time.Now().AddDate(2, 0, 0) // 2 months from now
	paymentClient := ArifpayGoPlugin.NewPayment(s.cfg.ARIFPAY.APIKey, expireDate)

	// Create checkout session
	response, err := paymentClient.MakePayment(paymentPayload)
	if err != nil {
		return "", err
	}

	transfer := domain.CreateTransfer{
		Amount:          domain.Currency(req.Beneficiaries[0].Amount),
		Verified:        false,
		Type:            domain.DEPOSIT,
		ReferenceNumber: uuid.NewString(),
		Status:          string(domain.PaymentStatusPending),
	}

	if _, err := s.transferStore.CreateTransfer(context.Background(), transfer); err != nil {
		return "", err
	}

	return response, nil
}

func (s *ArifpayService) B2CTransfer(ctx context.Context, req domain.ArifPayB2CRequest, endpoint string) (*map[string]interface{}, error) {
	// endpoint := c.baseURL + "/api/Telebirr/b2c/transfer"

	payloadBytes, err := json.Marshal(req)
	if err != nil {
		return nil, fmt.Errorf("failed to marshal request payload: %w", err)
	}

	httpReq, err := http.NewRequestWithContext(ctx, http.MethodPost, endpoint, bytes.NewBuffer(payloadBytes))
	if err != nil {
		return nil, fmt.Errorf("failed to create request: %w", err)
	}

	httpReq.Header.Set("Content-Type", "application/json")
	httpReq.Header.Set("Accept", "application/json")
	httpReq.Header.Set("x-arifpay-key", s.cfg.ARIFPAY.APIKey)

	resp, err := s.httpClient.Do(httpReq)
	if err != nil {
		return nil, fmt.Errorf("request to Telebirr B2C failed: %w", err)
	}
	defer resp.Body.Close()

	body, _ := io.ReadAll(resp.Body)
	if resp.StatusCode != http.StatusOK {
		return nil, fmt.Errorf("Telebirr API returned status %d: %s", resp.StatusCode, string(body))
	}

	var response map[string]interface{}
	if err := json.Unmarshal(body, &response); err != nil {
		return nil, fmt.Errorf("failed to parse response body: %w", err)
	}

	return &response, nil
}

func (s *ArifpayService) VerifyByTransactionID(transactionID string, paymentType int) ([]byte, error) {
	url := "https://gateway.arifpay.org/api/checkout/getSessionByTransactionId"

	var payload domain.ArifpayVerifyByTransactionIDRequest

	bodyBytes, err := json.Marshal(payload)
	if err != nil {
		return nil, fmt.Errorf("failed to marshal request body: %w", err)
	}

	req, err := http.NewRequest("POST", url, bytes.NewBuffer(bodyBytes))
	if err != nil {
		return nil, fmt.Errorf("failed to create request: %w", err)
	}

	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("x-arifpay-key", s.cfg.ARIFPAY.APIKey)

	resp, err := s.httpClient.Do(req)
	if err != nil {
		return nil, fmt.Errorf("request failed: %w", err)
	}
	defer resp.Body.Close()

	respBody, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, fmt.Errorf("failed to read response body: %w", err)
	}

	if resp.StatusCode != http.StatusOK {
		return nil, fmt.Errorf("non-200 response from Arifpay: %s", string(respBody))
	}

	return respBody, nil
}

func (s *ArifpayService) VerifyBySessionID(sessionID string) ([]byte, error) {
	url := "https://gateway.arifpay.org/api/ms/transaction/status/" + sessionID

	// Create GET request without body
	req, err := http.NewRequest("GET", url, nil)
	if err != nil {
		return nil, fmt.Errorf("failed to create request: %w", err)
	}

	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("x-arifpay-key", s.cfg.ARIFPAY.APIKey)

	resp, err := s.httpClient.Do(req)
	if err != nil {
		return nil, fmt.Errorf("request failed: %w", err)
	}
	defer resp.Body.Close()

	respBody, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, fmt.Errorf("failed to read response body: %w", err)
	}

	if resp.StatusCode != http.StatusOK {
		return nil, fmt.Errorf("non-200 response from Arifpay: %s", string(respBody))
	}

	return respBody, nil
}