package domain

import (
	"encoding/json"
	"fmt"
)

// ChapaFlexibleString unmarshals JSON string or number (Chapa verify/webhook payloads vary).
type ChapaFlexibleString string

func (s *ChapaFlexibleString) UnmarshalJSON(data []byte) error {
	if len(data) == 0 || string(data) == "null" {
		*s = ""
		return nil
	}
	switch data[0] {
	case '"':
		var v string
		if err := json.Unmarshal(data, &v); err != nil {
			return err
		}
		*s = ChapaFlexibleString(v)
	case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '-':
		var n json.Number
		if err := json.Unmarshal(data, &n); err != nil {
			return err
		}
		*s = ChapaFlexibleString(n.String())
	default:
		return fmt.Errorf("chapa flexible string: unsupported json type %q", data[0])
	}
	return nil
}

func (s ChapaFlexibleString) String() string {
	return string(s)
}

// ChapaInitializeRequest is sent to POST /transaction/initialize.
type ChapaInitializeRequest struct {
	Amount      string `json:"amount"`
	Currency    string `json:"currency"`
	Email       string `json:"email"`
	FirstName   string `json:"first_name"`
	LastName    string `json:"last_name"`
	PhoneNumber string `json:"phone_number,omitempty"`
	TxRef       string `json:"tx_ref"`
	CallbackURL string `json:"callback_url,omitempty"`
	ReturnURL   string `json:"return_url,omitempty"`
	Customization struct {
		Title       string `json:"title"`
		Description string `json:"description"`
	} `json:"customization,omitempty"`
}

type ChapaInitializeResponse struct {
	Status  string `json:"status"`
	Message string `json:"message"`
	Data    struct {
		CheckoutURL string `json:"checkout_url"`
	} `json:"data"`
}

type ChapaVerifyResponse struct {
	Status  string `json:"status"`
	Message string `json:"message"`
	Data    ChapaTransactionData `json:"data"`
}

type ChapaTransactionData struct {
	TxRef         string             `json:"tx_ref"`
	Reference     string             `json:"reference"`
	Amount        ChapaFlexibleString `json:"amount"`
	Currency      string             `json:"currency"`
	Status        string             `json:"status"`
	PaymentMethod string             `json:"payment_method"`
	Mode          string             `json:"mode"`
}

// ChapaWebhookPayload is the body POSTed to the webhook URL.
type ChapaWebhookPayload struct {
	Event         string  `json:"event"`
	Type          string  `json:"type"`
	TxRef         string  `json:"tx_ref"`
	Reference     string  `json:"reference"`
	Status        string  `json:"status"`
	Amount        ChapaFlexibleString `json:"amount"`
	Currency      string  `json:"currency"`
	PaymentMethod string  `json:"payment_method"`
	Mode          string  `json:"mode"`
}

// ChapaCallbackQuery is sent to callback_url after payment (GET).
type ChapaCallbackQuery struct {
	TrxRef string `json:"trx_ref"`
	RefID  string `json:"ref_id"`
	Status string `json:"status"`
}

type ChapaPaymentMethod struct {
	Name        string `json:"name"`
	DisplayName string `json:"display_name"`
}