package linodego

import (
	"context"
	"encoding/json"
	"fmt"
	"time"
)

// Payment represents a Payment object
type Payment struct {
	// The unique ID of the Payment
	ID int `json:"id"`

	// The amount, in US dollars, of the Payment.
	USD json.Number `json:"usd,Number"`

	// When the Payment was made.
	DateStr string     `json:"date"`
	Date    *time.Time `json:"-"`
}

// PaymentCreateOptions fields are those accepted by CreatePayment
type PaymentCreateOptions struct {
	// CVV (Card Verification Value) of the credit card to be used for the Payment
	CVV string `json:"cvv,omitempty"`

	// The amount, in US dollars, of the Payment
	USD json.Number `json:"usd,Number"`
}

// GetCreateOptions converts a Payment to PaymentCreateOptions for use in CreatePayment
func (i Payment) GetCreateOptions() (o PaymentCreateOptions) {
	o.USD = i.USD
	return
}

// PaymentsPagedResponse represents a paginated Payment API response
type PaymentsPagedResponse struct {
	*PageOptions
	Data []Payment `json:"data"`
}

// endpoint gets the endpoint URL for Payment
func (PaymentsPagedResponse) endpoint(c *Client) string {
	endpoint, err := c.Payments.Endpoint()
	if err != nil {
		panic(err)
	}
	return endpoint
}

// appendData appends Payments when processing paginated Payment responses
func (resp *PaymentsPagedResponse) appendData(r *PaymentsPagedResponse) {
	resp.Data = append(resp.Data, r.Data...)
}

// ListPayments lists Payments
func (c *Client) ListPayments(ctx context.Context, opts *ListOptions) ([]Payment, error) {
	response := PaymentsPagedResponse{}
	err := c.listHelper(ctx, &response, opts)
	for i := range response.Data {
		response.Data[i].fixDates()
	}
	if err != nil {
		return nil, err
	}
	return response.Data, nil
}

// fixDates converts JSON timestamps to Go time.Time values
func (i *Payment) fixDates() *Payment {
	i.Date, _ = parseDates(i.DateStr)
	return i
}

// GetPayment gets the payment with the provided ID
func (c *Client) GetPayment(ctx context.Context, id int) (*Payment, error) {
	e, err := c.Payments.Endpoint()
	if err != nil {
		return nil, err
	}
	e = fmt.Sprintf("%s/%d", e, id)
	r, err := coupleAPIErrors(c.R(ctx).SetResult(&Payment{}).Get(e))
	if err != nil {
		return nil, err
	}
	return r.Result().(*Payment).fixDates(), nil
}

// CreatePayment creates a Payment
func (c *Client) CreatePayment(ctx context.Context, createOpts PaymentCreateOptions) (*Payment, error) {
	var body string
	e, err := c.Payments.Endpoint()
	if err != nil {
		return nil, err
	}

	req := c.R(ctx).SetResult(&Payment{})

	if bodyData, err := json.Marshal(createOpts); err == nil {
		body = string(bodyData)
	} else {
		return nil, NewError(err)
	}

	r, err := coupleAPIErrors(req.
		SetBody(body).
		Post(e))

	if err != nil {
		return nil, err
	}
	return r.Result().(*Payment).fixDates(), nil
}