package server

import (
	"encoding/json"
	"io"
	"net/http"

	"git.grassecon.net/urdt/ussd/config"
	"git.grassecon.net/urdt/ussd/internal/models"
)

type AccountServiceInterface interface {
	CheckBalance(publicKey string) (string, error)
	CreateAccount() (*models.AccountResponse, error)
	CheckAccountStatus(trackingId string) (string, error)
	FetchVouchersFromAPI() ([]models.VoucherHolding, error)
}

type AccountService struct {
}



// CheckAccountStatus retrieves the status of an account transaction based on the provided tracking ID.
//
// Parameters:
//   - trackingId: A unique identifier for the account.This should be obtained from a previous call to
//     CreateAccount or a similar function that returns an AccountResponse. The `trackingId` field in the
//     AccountResponse struct can be used here to check the account status during a transaction.
//
//
// Returns:
//   - string: The status of the transaction as a string. If there is an error during the request or processing, this will be an empty string.
//   - error: An error if any occurred during the HTTP request, reading the response, or unmarshalling the JSON data.
//     If no error occurs, this will be nil.
//
func (as *AccountService) CheckAccountStatus(trackingId string) (string, error) {
	resp, err := http.Get(config.TrackStatusURL + trackingId)
	if err != nil {
		return "", err
	}
	defer resp.Body.Close()

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return "", err
	}

	var trackResp models.TrackStatusResponse
	err = json.Unmarshal(body, &trackResp)
	if err != nil {
		return "", err
	}

	status := trackResp.Result.Transaction.Status

	return status, nil
}


// CheckBalance retrieves the balance for a given public key from the custodial balance API endpoint.
// Parameters:
//   - publicKey: The public key associated with the account whose balance needs to be checked.
func (as *AccountService) CheckBalance(publicKey string) (string, error) {

	resp, err := http.Get(config.BalanceURL + publicKey)
	if err != nil {
		return "0.0", err
	}
	defer resp.Body.Close()

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return "0.0", err
	}

	var balanceResp models.BalanceResponse
	err = json.Unmarshal(body, &balanceResp)
	if err != nil {
		return "0.0", err
	}

	balance := balanceResp.Result.Balance
	return balance, nil
}


//CreateAccount creates a new account in the custodial system.
// Returns:
//   - *models.AccountResponse: A pointer to an AccountResponse struct containing the details of the created account.
//     If there is an error during the request or processing, this will be nil.
//   - error: An error if any occurred during the HTTP request, reading the response, or unmarshalling the JSON data.
//     If no error occurs, this will be nil.
func (as *AccountService) CreateAccount() (*models.AccountResponse, error) {
	resp, err := http.Post(config.CreateAccountURL, "application/json", nil)
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, err
	}

	var accountResp models.AccountResponse
	err = json.Unmarshal(body, &accountResp)
	if err != nil {
		return nil, err
	}

	return &accountResp, nil
}

// fetchVouchersFromAPI calls the API to get the list of vouchers belonging to the user
func  (as *AccountService) FetchVouchersFromAPI() ([]models.VoucherHolding, error) {
	// TODO replace with the actual request once ready
	mockJSON := `[
		{
			"symbol": "MUMO",
			"address": "0x078b3a26596218507781722A4e8825BFB9570Fba"
		},
		{
			"symbol": "SRF",
			"address": "0x45d747172e77d55575c197CbA9451bC2CD8F4958"
		},
		{
			"symbol": "HALGAN",
			"address": "0x12169Fb5931A599ad1283bb8311Dad54Feb51A28"
		}
	]`

	// Unmarshal the JSON response
	var holdings []models.VoucherHolding
	err := json.Unmarshal([]byte(mockJSON), &holdings)
	if err != nil {
		return nil, err
	}

	return holdings, nil
}