package monero_rpc

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"net/url"
	"time"
)

// HttpClient 封装
type HttpClient struct {
	Client *http.Client
	Url    string
}

func NewHttpClient(url string, timeout time.Duration) *HttpClient {
	return &HttpClient{
		Client: &http.Client{
			Timeout: timeout,
		},
		Url: url,
	}
}

// GET 请求，params 可为 nil
func (hc *HttpClient) Get(api string, params map[string]interface{}, headers map[string]string) ([]byte, error) {
	rawURL := hc.Url + "/json_rpc" + api
	// 处理 URL 参数
	if params != nil {
		u, err := url.Parse(rawURL)
		if err != nil {
			return nil, err
		}
		q := u.Query()
		for k, v := range params {
			q.Set(k, fmt.Sprintf("%v", v))
		}
		u.RawQuery = q.Encode()
		rawURL = u.String()
	}

	// 创建请求
	req, err := http.NewRequest("GET", rawURL, nil)
	if err != nil {
		return nil, err
	}
	// 设置头
	for k, v := range headers {
		req.Header.Set(k, v)
	}

	// 发送请求
	resp, err := hc.Client.Do(req)
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()

	return io.ReadAll(resp.Body)
}

// POST 请求，params 可为 nil
func (hc *HttpClient) Post(api string, params interface{}, headers map[string]string) ([]byte, error) {
	rawURL := hc.Url + "/json_rpc" + api
	var body io.Reader
	if params != nil {
		jsonBytes, err := json.Marshal(params)
		if err != nil {
			return nil, err
		}
		body = bytes.NewBuffer(jsonBytes)
	}

	req, err := http.NewRequest("POST", rawURL, body)
	if err != nil {
		return nil, err
	}

	// 设置默认 Content-Type
	if _, ok := headers["Content-Type"]; !ok {
		req.Header.Set("Content-Type", "application/json")
	}

	// 设置额外头
	for k, v := range headers {
		req.Header.Set(k, v)
	}

	resp, err := hc.Client.Do(req)
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()

	return io.ReadAll(resp.Body)
}

type RPCRequest struct {
	JsonRPC string      `json:"jsonrpc"`
	ID      string      `json:"id"`
	Method  string      `json:"method"`
	Params  interface{} `json:"params"`
}

func (hc *HttpClient) GetBlockTemplate(address string, size int) ([]byte, error) {
	params := map[string]any{
		"wallet_address": address,
		"reserve_size":   size,
	}
	req := RPCRequest{
		JsonRPC: "2.0",
		ID:      "0",
		Method:  "get_block_template",
		Params:  params,
	}
	resp, err := hc.Post("", req, nil)
	if err != nil {
		fmt.Println("[gbt]: getblocktemplate error:", err)
		return nil, err
	}

	return resp, nil
}

func (hc *HttpClient) GetBlockHeader(height uint64) ([]byte, error) {
	params := map[string]any{
		"height":        height,
		"fill_pow_hash": true,
	}
	req := RPCRequest{
		JsonRPC: "2.0",
		ID:      "0",
		Method:  "get_block_header_by_height",
		Params:  params,
	}
	resp, err := hc.Post("", req, nil)
	if err != nil {
		fmt.Println("[gbt]: getblockheader error:", err)
		return nil, err
	}
	return resp, nil
}

func (hc *HttpClient) GetBlockByHash(hash string) ([]byte, error) {
	params := map[string]any{
		"hash": hash,
	}
	req := RPCRequest{
		JsonRPC: "2.0",
		ID:      "0",
		Method:  "get_block_header_by_hash",
		Params:  params,
	}
	resp, err := hc.Post("", req, nil)
	if err != nil {
		fmt.Println("[gbt]: getblockheader error:", err)
		return nil, err
	}
	return resp, nil
}

func (hc *HttpClient) SubmitBlock(blob string) ([]byte, error) {
	params := []string{blob}
	req := RPCRequest{
		JsonRPC: "2.0",
		ID:      "0",
		Method:  "submit_block",
		Params:  params,
	}
	resp, err := hc.Post("", req, nil)
	if err != nil {
		fmt.Println("[gbt]: getblockheader error:", err)
		return nil, err
	}
	return resp, nil
}