package verifactu

import (
	"bytes"
	"crypto/tls"
	"encoding/xml"
	"fmt"
	"io"
	"net/http"
)

type Config struct {
	Environment string
	CertPath    string
	CertPass    string
}

type Client struct {
	cfg        Config
	httpClient *http.Client
}

func NewClient(cfg Config) *Client {
	tr := &http.Transport{
		TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
	}
	return &Client{
		cfg:        cfg,
		httpClient: &http.Client{Transport: tr},
	}
}

func (c *Client) GetEndpoint() string {
	if c.cfg.Environment == "production" {
		return "https://www2.agenciatributaria.gob.es/static_files/common/internet/dep/aplicaciones/es/aeat/tikeV1.0/cont/ws/SistemaFacturacion.wsdl"
	}
	return "https://prewww2.aeat.es/static_files/common/internet/dep/aplicaciones/es/aeat/tikeV1.0/cont/ws/SistemaFacturacion.wsdl"
}

type XMLRequest struct {
	XMLName   xml.Name    `xml:"soapenv:Envelope"`
	Xmlns     string      `xml:"xmlns:soapenv,attr"`
	XmlnsXsi  string      `xml:"xmlns:xsi,attr"`
	XmlnsSum  string      `xml:"xmlns:sum,attr"`
	XmlnsSum1 string      `xml:"xmlns:sum1,attr"`
	XmlnsXd   string      `xml:"xmlns:xd,attr"`
	Header    interface{} `xml:"soapenv:Header"`
	Body      XMLBody     `xml:"soapenv:Body"`
}

type XMLBody struct {
	Content interface{} `xml:",any"`
}

func (c *Client) Send(xmlPayload interface{}) ([]byte, error) {
	var buf bytes.Buffer
	enc := xml.NewEncoder(&buf)
	err := enc.Encode(xmlPayload)
	if err != nil {
		return nil, fmt.Errorf("failed to encode XML: %w", err)
	}

	req, err := http.NewRequest("POST", c.GetEndpoint(), &buf)
	if err != nil {
		return nil, fmt.Errorf("failed to create request: %w", err)
	}

	req.Header.Set("Content-Type", "text/xml; charset=utf-8")
	req.Header.Set("SOAPAction", "")

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

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

	if resp.StatusCode >= 400 {
		return nil, fmt.Errorf("HTTP error %d: %s", resp.StatusCode, string(body))
	}

	return body, nil
}