package saashttp

import (
	"bytes"
	"compress/gzip"
	"crypto/md5"
	"encoding/hex"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"net/url"
	"os"
	"strconv"
	"strings"
	"time"

	"git.algo.com.cn/public/saasapi"
	"google.golang.org/protobuf/proto"
)

type ResponseEncoder int

const (
	RESPONSE_ENCODER_PROTOBUF ResponseEncoder = iota
	RESPONSE_ENCODER_JSON                     = 1
)

type SaasClient struct {
	Client          *http.Client
	ApiUrls         *ApiUrls
	Auth            *Auth
	ResponseEncoder ResponseEncoder
}

func (c *SaasClient) Info(saasReq *saasapi.SaasReq) (saasRes *saasapi.SaasRes, err error) {
	postUrl := c.makeUrl(c.ApiUrls.BaseUrl, c.ApiUrls.InfoPath)
	return c.post(postUrl, saasReq)
}

func (c *SaasClient) Write(saasReq *saasapi.SaasReq) (saasRes *saasapi.SaasRes, err error) {
	postUrl := c.makeUrl(c.ApiUrls.BaseUrl, c.ApiUrls.WritePath)
	return c.post(postUrl, saasReq)
}

func (c *SaasClient) Read(saasReq *saasapi.SaasReq) (saasRes *saasapi.SaasRes, err error) {
	postUrl := c.makeUrl(c.ApiUrls.BaseUrl, c.ApiUrls.ReadPath)
	return c.post(postUrl, saasReq)
}

func (c *SaasClient) ColumnWrite(saasReq *saasapi.SaasReq) (saasRes *saasapi.SaasRes, err error) {
	postUrl := c.makeUrl(c.ApiUrls.BaseUrl, c.ApiUrls.ColumnWritePath)
	return c.post(postUrl, saasReq)
}

func (c *SaasClient) TaskCreate(saasReq *saasapi.SaasReq) (saasRes *saasapi.SaasRes, err error) {
	postUrl := c.makeUrl(c.ApiUrls.BaseUrl, c.ApiUrls.TaskCreatePath)
	return c.post(postUrl, saasReq)
}

func (c *SaasClient) TaskList(saasReq *saasapi.SaasReq) (saasRes *saasapi.SaasRes, err error) {
	postUrl := c.makeUrl(c.ApiUrls.BaseUrl, c.ApiUrls.TaskListPath)
	return c.post(postUrl, saasReq)
}

func (c *SaasClient) TaskDelete(saasReq *saasapi.SaasReq) (saasRes *saasapi.SaasRes, err error) {
	postUrl := c.makeUrl(c.ApiUrls.BaseUrl, c.ApiUrls.TaskDeletePath)
	return c.post(postUrl, saasReq)
}

func (c *SaasClient) TaskInfo(saasReq *saasapi.SaasReq) (saasRes *saasapi.SaasRes, err error) {
	postUrl := c.makeUrl(c.ApiUrls.BaseUrl, c.ApiUrls.TaskInfoPath)
	return c.post(postUrl, saasReq)
}

func (c *SaasClient) TaskRun(saasReq *saasapi.SaasReq) (saasRes *saasapi.SaasRes, err error) {
	postUrl := c.makeUrl(c.ApiUrls.BaseUrl, c.ApiUrls.TaskRunPath)
	return c.post(postUrl, saasReq)
}

func (c *SaasClient) TaskUpload(sha256 string, file *os.File, offset int64, size int) (saasRes *saasapi.SaasRes, err error) {
	postUrl := c.makeUrl(c.ApiUrls.BaseUrl, c.ApiUrls.TaskUploadPath, "sha256", sha256)
	return c.upload(postUrl, file, offset, size)
}

func (c *SaasClient) TaskDownload(sha256 string, file *os.File, offset int64, size int) (saasRes *saasapi.SaasRes, err error) {
	postUrl := c.makeUrl(c.ApiUrls.BaseUrl, c.ApiUrls.TaskDownloadPath, "sha256", sha256)
	return c.download(postUrl, file, offset, size)
}

func (c *SaasClient) TargetList(saasReq *saasapi.SaasReq) (saasRes *saasapi.SaasRes, err error) {
	postUrl := c.makeUrl(c.ApiUrls.BaseUrl, c.ApiUrls.TargetListPath)
	return c.post(postUrl, saasReq)
}

func (c *SaasClient) TargetCreate(saasReq *saasapi.SaasReq) (saasRes *saasapi.SaasRes, err error) {
	postUrl := c.makeUrl(c.ApiUrls.BaseUrl, c.ApiUrls.TargetCreatePath)
	return c.post(postUrl, saasReq)
}

func (c *SaasClient) TargetDelete(saasReq *saasapi.SaasReq) (saasRes *saasapi.SaasRes, err error) {
	postUrl := c.makeUrl(c.ApiUrls.BaseUrl, c.ApiUrls.TargetDeletePath)
	return c.post(postUrl, saasReq)
}

func (c *SaasClient) BindSet(saasReq *saasapi.SaasReq) (saasRes *saasapi.SaasRes, err error) {
	postUrl := c.makeUrl(c.ApiUrls.BaseUrl, c.ApiUrls.BindSetPath)
	return c.post(postUrl, saasReq)
}

func (c *SaasClient) BindDelete(saasReq *saasapi.SaasReq) (saasRes *saasapi.SaasRes, err error) {
	postUrl := c.makeUrl(c.ApiUrls.BaseUrl, c.ApiUrls.BindDeletePath)
	return c.post(postUrl, saasReq)
}

func (c *SaasClient) ScriptRun(saasReq *saasapi.SaasReq) (saasRes *saasapi.SaasRes, err error) {
	postUrl := c.makeUrl(c.ApiUrls.BaseUrl, c.ApiUrls.ScriptRunPath)
	return c.post(postUrl, saasReq)
}

func (c *SaasClient) ExpList(saasReq *saasapi.SaasReq) (saasRes *saasapi.SaasRes, err error) {
	postUrl := c.makeUrl(c.ApiUrls.BaseUrl, c.ApiUrls.ExpListPath)
	return c.post(postUrl, saasReq)
}

func (c *SaasClient) ExpGet(saasReq *saasapi.SaasReq) (saasRes *saasapi.SaasRes, err error) {
	postUrl := c.makeUrl(c.ApiUrls.BaseUrl, c.ApiUrls.ExpGetPath)
	return c.post(postUrl, saasReq)
}

func (c *SaasClient) makeUrl(baseUrl, path string, params ...string) string {
	url, err := url.Parse(baseUrl)
	if err != nil {
		panic(err)
	}

	url = url.JoinPath(path)
	queryValues := url.Query()
	switch c.ResponseEncoder {
	case RESPONSE_ENCODER_PROTOBUF:
		queryValues.Add("resmode", "protobuf")
	case RESPONSE_ENCODER_JSON:
		queryValues.Add("resmode", "json")
	default:
		queryValues.Add("resmode", "protobuf")
	}

	for i := 0; i < len(params); i += 2 {
		queryValues.Add(params[i], params[i+1])
	}
	url.RawQuery = queryValues.Encode()

	return url.String()
}

func (c *SaasClient) post(url string, saasReq *saasapi.SaasReq) (saasRes *saasapi.SaasRes, err error) {
	postBuf, err := proto.Marshal(saasReq)
	if err != nil {
		fmt.Println("marshal saas req error", err)
		return nil, err
	}

	req, err := http.NewRequest("POST", url, bytes.NewBuffer(postBuf))
	if err != nil {
		fmt.Println("http new request error", err)
		return nil, err
	}

	timeStamp := strconv.FormatInt(time.Now().Unix(), 10)
	md5byte := md5.Sum([]byte(c.Auth.Account + c.Auth.Token + timeStamp))
	authorization := hex.EncodeToString(md5byte[:])

	req.Header.Add("Account", c.Auth.Account)
	req.Header.Add("Time", timeStamp)
	req.Header.Add("Authorization", authorization)
	req.Header.Add("Content-Type", "application/x-protobuf")
	res, err := c.Client.Do(req)
	if err != nil {
		fmt.Println("http send error", err)
		return nil, err
	}

	defer res.Body.Close()

	resBody, err := io.ReadAll(res.Body)
	if err != nil {
		fmt.Println("http read body error", err)
		return nil, err
	}

	saasRes = &saasapi.SaasRes{}
	if c.ResponseEncoder == RESPONSE_ENCODER_PROTOBUF {
		err = proto.Unmarshal(resBody, saasRes)
		if err != nil {
			fmt.Println("unmarshal response body to protobuf error", err)
			return nil, err
		}
	} else {
		err = json.Unmarshal(resBody, saasRes)
		if err != nil {
			fmt.Println("unmarshal response body to json error", err)
			return nil, err
		}
	}

	return saasRes, nil
}

func (c *SaasClient) upload(url string, file *os.File, offset int64, size int) (saasRes *saasapi.SaasRes, err error) {
	if file == nil {
		return nil, fmt.Errorf("file is nil")
	}

	if size <= 0 {
		return nil, fmt.Errorf("size is invalid")
	}

	buf := make([]byte, size)
	n, err := file.ReadAt(buf, offset)
	if err != nil {
		fmt.Println("read file error", err)
		return nil, err
	}
	if n != size {
		return nil, fmt.Errorf("read file error")
	}

	var gzBuf bytes.Buffer
	gz := gzip.NewWriter(&gzBuf)

	if _, err := gz.Write(buf); err != nil {
		fmt.Println("gzip write error", err)
		return nil, err
	}

	if err = gz.Close(); err != nil {
		return nil, err
	}

	req, err := http.NewRequest("POST", url, bytes.NewBuffer(gzBuf.Bytes()))
	if err != nil {
		fmt.Println("http new request error", err)
		return nil, err
	}

	timeStamp := strconv.FormatInt(time.Now().Unix(), 10)
	md5byte := md5.Sum([]byte(c.Auth.Account + c.Auth.Token + timeStamp))
	authorization := hex.EncodeToString(md5byte[:])

	req.Header.Add("Account", c.Auth.Account)
	req.Header.Add("Time", timeStamp)
	req.Header.Add("Authorization", authorization)
	req.Header.Add("Content-Type", "application/octet-stream")
	req.Header.Add("Content-Encoding", "gzip")
	res, err := c.Client.Do(req)
	if err != nil {
		fmt.Println("http send error", err)
		return nil, err
	}

	defer res.Body.Close()

	resBody, err := io.ReadAll(res.Body)
	if err != nil {
		fmt.Println("http read body error", err)
		return nil, err
	}

	saasRes = &saasapi.SaasRes{}
	if c.ResponseEncoder == RESPONSE_ENCODER_PROTOBUF {
		err = proto.Unmarshal(resBody, saasRes)
		if err != nil {
			fmt.Println("unmarshal response body to protobuf error", err)
			return nil, err
		}
	} else {
		err = json.Unmarshal(resBody, saasRes)
		if err != nil {
			fmt.Println("unmarshal response body to json error", err)
			return nil, err
		}
	}

	return saasRes, nil
}

func (c *SaasClient) download(url string, file *os.File, offset int64, size int) (saasRes *saasapi.SaasRes, err error) {
	if file == nil {
		return nil, fmt.Errorf("file is nil")
	}

	if size <= 0 {
		return nil, fmt.Errorf("size is invalid")
	}

	req, err := http.NewRequest("GET", url, bytes.NewBuffer([]byte{}))
	if err != nil {
		fmt.Println("http new request error", err)
		return nil, err
	}

	timeStamp := strconv.FormatInt(time.Now().Unix(), 10)
	md5byte := md5.Sum([]byte(c.Auth.Account + c.Auth.Token + timeStamp))
	authorization := hex.EncodeToString(md5byte[:])

	req.Header.Add("Account", c.Auth.Account)
	req.Header.Add("Time", timeStamp)
	req.Header.Add("Authorization", authorization)
	req.Header.Add("Accept-Encoding", "gzip")

	res, err := c.Client.Do(req)
	if err != nil {
		fmt.Println("http send error", err)
		return nil, err
	}

	defer res.Body.Close()

	if res.StatusCode != 200 {
		err = fmt.Errorf("NOT 200. %v", res.StatusCode)
		fmt.Println("http state error", err)
		return nil, err
	}

	bodyReader := res.Body
	if strings.Contains(res.Header.Get("Content-Encoding"), "gzip") {
		gz, err := gzip.NewReader(res.Body)
		if err != nil {
			fmt.Println("gzip newreader error", err)
			return nil, err
		}
		defer gz.Close()
		bodyReader = gz
	}

	resBody, err := io.ReadAll(bodyReader)
	if err != nil {
		fmt.Println("read body error", err)
		return nil, err
	}
	saasRes = &saasapi.SaasRes{}

	if strings.Contains(res.Header.Get("Content-Type"), "application/octet-stream") {
		if len(resBody) == size {
			file.WriteAt(resBody, offset)
		} else {
			err = fmt.Errorf("body size error. body:%v, want:%v", len(resBody), size)
			fmt.Println("http read body error", err)
			return nil, err
		}
	} else {
		if c.ResponseEncoder == RESPONSE_ENCODER_PROTOBUF {
			err = proto.Unmarshal(resBody, saasRes)
			if err != nil {
				fmt.Println("unmarshal response body to protobuf error", err)
				return nil, err
			}
		} else {
			err = json.Unmarshal(resBody, saasRes)
			if err != nil {
				fmt.Println("unmarshal response body to json error", err)
				return nil, err
			}
		}
	}

	return saasRes, nil
}

func (c *SaasClient) ScriptCreate(saasReq *saasapi.SaasReq) (saasRes *saasapi.SaasRes, err error) {
	postUrl := c.makeUrl(c.ApiUrls.BaseUrl, c.ApiUrls.ScriptCreatePath)
	return c.post(postUrl, saasReq)
}

func (c *SaasClient) ScriptList(saasReq *saasapi.SaasReq) (saasRes *saasapi.SaasRes, err error) {
	postUrl := c.makeUrl(c.ApiUrls.BaseUrl, c.ApiUrls.ScriptListPath)
	return c.post(postUrl, saasReq)
}

func (c *SaasClient) ScriptDelete(saasReq *saasapi.SaasReq) (saasRes *saasapi.SaasRes, err error) {
	postUrl := c.makeUrl(c.ApiUrls.BaseUrl, c.ApiUrls.ScriptDeletePath)
	return c.post(postUrl, saasReq)
}

func (c *SaasClient) ScriptGet(saasReq *saasapi.SaasReq) (saasRes *saasapi.SaasRes, err error) {
	postUrl := c.makeUrl(c.ApiUrls.BaseUrl, c.ApiUrls.ScriptGetPath)
	return c.post(postUrl, saasReq)
}

func (c *SaasClient) ScriptUse(saasReq *saasapi.SaasReq) (saasRes *saasapi.SaasRes, err error) {
	postUrl := c.makeUrl(c.ApiUrls.BaseUrl, c.ApiUrls.ScriptUsePath)
	return c.post(postUrl, saasReq)
}