package service

import (
	"context"
	"fmt"
	"strings"

	"oci-portal/internal/oci"
)

// maxInvoicePdfBytes 是发票 PDF 中转上限;正常发票远小于此,超限视为异常。
const maxInvoicePdfBytes = 20 << 20

// Invoices 列出租户发票;year>0 只取该自然年(前端按年懒加载),0 为全量。
func (s *OciConfigService) Invoices(ctx context.Context, id uint, year int) ([]oci.Invoice, error) {
	if year != 0 && (year < 2000 || year > 2100) {
		return nil, fmt.Errorf("invoices: invalid year %d", year)
	}
	cred, err := s.credentialsByID(ctx, id)
	if err != nil {
		return nil, err
	}
	return s.client.ListInvoices(ctx, cred, year)
}

// InvoiceLines 列出一张发票的费用明细。
func (s *OciConfigService) InvoiceLines(ctx context.Context, id uint, internalID string) ([]oci.InvoiceLine, error) {
	if internalID == "" {
		return nil, fmt.Errorf("invoice lines: internal invoice id is empty")
	}
	cred, err := s.credentialsByID(ctx, id)
	if err != nil {
		return nil, err
	}
	return s.client.ListInvoiceLines(ctx, cred, internalID)
}

// InvoicePdf 拉取一张发票的 PDF 原文。
func (s *OciConfigService) InvoicePdf(ctx context.Context, id uint, internalID string) ([]byte, error) {
	if internalID == "" {
		return nil, fmt.Errorf("invoice pdf: internal invoice id is empty")
	}
	cred, err := s.credentialsByID(ctx, id)
	if err != nil {
		return nil, err
	}
	return s.client.DownloadInvoicePdf(ctx, cred, internalID, maxInvoicePdfBytes)
}

// PayInvoice 按订阅默认付款方式支付发票;email 接收付款回执,必填。
func (s *OciConfigService) PayInvoice(ctx context.Context, id uint, internalID, email string) error {
	if internalID == "" {
		return fmt.Errorf("pay invoice: internal invoice id is empty")
	}
	if !strings.Contains(email, "@") {
		return fmt.Errorf("pay invoice: invalid receipt email")
	}
	cred, err := s.credentialsByID(ctx, id)
	if err != nil {
		return err
	}
	return s.client.PayInvoice(ctx, cred, internalID, email)
}

// PaymentMethods 列出订阅上登记的全部付款方式。
func (s *OciConfigService) PaymentMethods(ctx context.Context, id uint) ([]oci.PaymentMethod, error) {
	cred, err := s.credentialsByID(ctx, id)
	if err != nil {
		return nil, err
	}
	return s.client.ListPaymentMethods(ctx, cred)
}