package remote

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"net/http"
	"net/http/httputil"
	"net/url"
	"platform/pkg/env"
	"platform/pkg/rds"
	"strconv"
	"strings"
	"time"
)

// CloudClient 定义云服务接口
type CloudClient interface {
	CloudEdges(param CloudEdgesReq) (*CloudEdgesResp, error)
	CloudConnect(param CloudConnectReq) error
	CloudDisconnect(param CloudDisconnectReq) (int, error)
	CloudAutoQuery() (CloudConnectResp, error)
}

// GatewayClient 定义网关接口
type GatewayClient interface {
	GatewayPortConfigs(params []PortConfigsReq) error
	GatewayPortActive(param ...PortActiveReq) (map[string]PortData, error)
}

type cloud struct {
	url string
}

var Cloud CloudClient

func Init() {
	Cloud = &cloud{
		url: env.RemoteAddr,
	}
}

type AutoConfig struct {
	Province string `json:"province"`
	City     string `json:"city"`
	Isp      string `json:"isp"`
	Count    int    `json:"count"`
}

// region cloud:/edges

type CloudEdgesReq struct {
	Province string
	City     string
	Isp      string
	Offset   int
	Limit    int
}

type CloudEdgesResp struct {
	Edges  []Edge `json:"edges"`
	Total  int    `json:"total"`
	Offset int    `json:"offset"`
	Limit  int    `json:"limit"`
}

type Edge struct {
	EdgesId    int    `json:"edges_id"`
	Province   string `json:"province"`
	City       string `json:"city"`
	Isp        string `json:"isp"`
	Ip         string `json:"ip"`
	Rtt        int    `json:"rtt"`
	PacketLoss int    `json:"packet_loss"`
}

func (c *cloud) CloudEdges(param CloudEdgesReq) (*CloudEdgesResp, error) {
	data := strings.Builder{}
	data.WriteString("province=")
	data.WriteString(param.Province)
	data.WriteString("&city=")
	data.WriteString(param.City)
	data.WriteString("&isp=")
	data.WriteString(param.Isp)
	data.WriteString("&offset=")
	data.WriteString(strconv.Itoa(param.Offset))
	data.WriteString("&limit=")
	data.WriteString(strconv.Itoa(param.Limit))

	resp, err := c.requestCloud("GET", "/edges?"+data.String(), "")
	if err != nil {
		return nil, err
	}
	defer func(Body io.ReadCloser) {
		_ = Body.Close()
	}(resp.Body)

	if resp.StatusCode != http.StatusOK {
		return nil, errors.New("failed to get edges")
	}

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, err
	}

	var result CloudEdgesResp
	err = json.Unmarshal(body, &result)
	if err != nil {
		return nil, err
	}

	return &result, nil
}

// endregion

// region cloud:/connect

type CloudConnectReq struct {
	Uuid       string       `json:"uuid"`
	Edge       []string     `json:"edge,omitempty"`
	AutoConfig []AutoConfig `json:"auto_config,omitempty"`
}

func (c *cloud) CloudConnect(param CloudConnectReq) error {
	data, err := json.Marshal(param)
	if err != nil {
		return err
	}

	resp, err := c.requestCloud("POST", "/connect", string(data))
	if err != nil {
		return err
	}

	defer func(Body io.ReadCloser) {
		_ = Body.Close()
	}(resp.Body)

	if resp.StatusCode != http.StatusOK {
		return errors.New("failed to connect")
	}

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return err
	}

	var result map[string]any
	err = json.Unmarshal(body, &result)
	if err != nil {
		return err
	}

	if result["status"] == "error" {
		return errors.New(result["details"].(string))
	}

	return nil
}

// endregion

// region cloud:/disconnect

type CloudDisconnectReq struct {
	Uuid   string   `json:"uuid"`
	Edge   []string `json:"edge,omitempty"`
	Config []Config `json:"auto_config,omitempty"`
}

type Config struct {
	Province string `json:"province"`
	City     string `json:"city"`
	Isp      string `json:"isp"`
	Count    int    `json:"count"`
	Online   bool   `json:"online"`
}

func (c *cloud) CloudDisconnect(param CloudDisconnectReq) (int, error) {
	data, err := json.Marshal(param)
	if err != nil {
		return 0, err
	}

	resp, err := c.requestCloud("POST", "/disconnect", string(data))
	if err != nil {
		return 0, err
	}

	defer func(Body io.ReadCloser) {
		_ = Body.Close()
	}(resp.Body)

	if resp.StatusCode != http.StatusOK {
		return 0, errors.New("failed to disconnect")
	}

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return 0, err
	}

	var result map[string]any
	err = json.Unmarshal(body, &result)
	if err != nil {
		return 0, err
	}

	if result["status"] == "error" {
		return 0, errors.New(result["details"].(string))
	}

	return int(result["disconnected_edges"].(float64)), nil
}

// endregion

// region cloud:/auto_query

type CloudConnectResp map[string][]AutoConfig

func (c *cloud) CloudAutoQuery() (CloudConnectResp, error) {
	resp, err := c.requestCloud("GET", "/auto_query", "")
	if err != nil {
		return nil, err
	}
	defer func(Body io.ReadCloser) {
		_ = Body.Close()
	}(resp.Body)

	if resp.StatusCode != http.StatusOK {
		return nil, errors.New("failed to get auto_query")
	}

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, err
	}

	var result CloudConnectResp
	err = json.Unmarshal(body, &result)
	if err != nil {
		return nil, err
	}

	return result, nil
}

// endregion

func (c *cloud) requestCloud(method string, url string, data string) (*http.Response, error) {

	url = fmt.Sprintf("%s/api%s", c.url, url)
	req, err := http.NewRequest(method, url, strings.NewReader(data))
	if err != nil {
		return nil, err
	}

	req.Header.Set("Content-Type", "application/json")

	var resp *http.Response
	for i := 0; i < 2; i++ {
		token, err := c.token(i == 1)
		if err != nil {
			return nil, err
		}
		req.Header.Set("token", token)

		if env.DebugHttpDump {
			str, err := httputil.DumpRequest(req, true)
			if err != nil {
				return nil, err
			}
			fmt.Println("==============================")
			fmt.Println(string(str))
		}

		resp, err = http.DefaultClient.Do(req)
		if err != nil {
			return nil, err
		}

		if env.DebugHttpDump {
			str, err := httputil.DumpResponse(resp, true)
			if err != nil {
				return nil, err
			}
			fmt.Println("------------------------------")
			fmt.Println(string(str))
		}

		if resp.StatusCode != 401 {
			break
		}
	}

	return resp, nil
}

func (c *cloud) token(refresh bool) (string, error) {
	// redis 获取令牌
	if !refresh {
		token, err := rds.Client.Get(context.Background(), "remote:token").Result()
		if err == nil && token != "" {
			return token, nil
		}
	}

	// redis 获取失败，重新获取
	resp, err := http.Get(env.RemoteToken)
	if err != nil {
		return "", err
	}
	defer func(Body io.ReadCloser) {
		_ = Body.Close()
	}(resp.Body)

	dump, err := httputil.DumpResponse(resp, true)
	if err != nil {
		return "", err
	}
	fmt.Println(string(dump))

	if resp.StatusCode != http.StatusOK {
		return "", errors.New("failed to get token")
	}

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return "", err
	}
	var result map[string]any
	err = json.Unmarshal(body, &result)
	if err != nil {
		return "", err
	}

	if result["code"].(float64) != 1 {
		return "", errors.New("failed to get cloud token")
	}

	// redis 设置令牌
	token := result["token"].(string)
	err = rds.Client.Set(context.Background(), "remote:token", token, 1*time.Hour).Err()
	if err != nil {
		return "", err
	}

	return token, nil
}

type gateway struct {
	url      string
	username string
	password string
}

var GatewayInitializer = func(url, username, password string) GatewayClient {
	return &gateway{
		url:      url,
		username: username,
		password: password,
	}
}

func NewGateway(url, username, password string) GatewayClient {
	return GatewayInitializer(url, username, password)
}

// region gateway:/port/configs

type PortConfigsReq struct {
	Port           int             `json:"port"`
	Edge           *[]string       `json:"edge,omitempty"`
	Type           string          `json:"type,omitempty"`
	Time           int             `json:"time,omitempty"`
	Status         bool            `json:"status"`
	Rate           int             `json:"rate,omitempty"`
	Whitelist      *[]string       `json:"whitelist,omitempty"`
	Userpass       *string         `json:"userpass,omitempty"`
	AutoEdgeConfig *AutoEdgeConfig `json:"auto_edge_config,omitempty"`
}

type AutoEdgeConfig struct {
	Province   string `json:"province,omitempty"`
	City       string `json:"city,omitempty"`
	Isp        string `json:"isp,omitempty"`
	Count      *int   `json:"count,omitempty"`
	PacketLoss int    `json:"packet_loss,omitempty"`
}

func (c *gateway) GatewayPortConfigs(params []PortConfigsReq) error {
	if len(params) == 0 {
		return errors.New("params is empty")
	}

	data, err := json.Marshal(params)
	if err != nil {
		return err
	}

	resp, err := c.requestGateway("POST", "/port/configs", string(data))
	if err != nil {
		return err
	}
	defer func(Body io.ReadCloser) {
		_ = Body.Close()
	}(resp.Body)

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return err
	}

	if resp.StatusCode != http.StatusOK {
		return errors.New("failed to get port configs: " + string(body))
	}

	var result map[string]any
	err = json.Unmarshal(body, &result)
	if err != nil {
		return err
	}

	if result["code"].(float64) != 0 {
		return errors.New("failed to configure port")
	}

	return nil
}

// endregion

// region gateway:/port/active

type PortActiveReq struct {
	Port   string `json:"port"`
	Active *bool  `json:"active"`
	Status *bool  `json:"status"`
}

type PortActiveResp struct {
	Code int                 `json:"code"`
	Msg  string              `json:"msg"`
	Data map[string]PortData `json:"data"`
}

type PortData struct {
	Edge      []string `json:"edge"`
	Type      string   `json:"type"`
	Status    bool     `json:"status"`
	Active    bool     `json:"active"`
	Time      int      `json:"time"`
	Whitelist []string `json:"whitelist"`
	Userpass  string   `json:"userpass"`
}

func (c *gateway) GatewayPortActive(param ...PortActiveReq) (map[string]PortData, error) {
	_param := PortActiveReq{}
	if len(param) != 0 {
		_param = param[0]
	}

	path := strings.Builder{}
	path.WriteString("/port/active")

	if _param.Port != "" {
		path.WriteString("/")
		path.WriteString(_param.Port)
	}

	values := url.Values{}
	if _param.Active != nil {
		values.Set("active", strconv.FormatBool(*_param.Active))
	}
	if _param.Status != nil {
		values.Set("status", strconv.FormatBool(*_param.Status))
	}

	if len(values) > 0 {
		path.WriteString("?")
		path.WriteString(values.Encode())
	}

	resp, err := c.requestGateway("GET", path.String(), "")
	if err != nil {
		return nil, err
	}
	defer func(Body io.ReadCloser) {
		_ = Body.Close()
	}(resp.Body)

	if resp.StatusCode != http.StatusOK {
		return nil, errors.New("failed to get port active")
	}

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, err
	}

	var result PortActiveResp
	err = json.Unmarshal(body, &result)
	if err != nil {
		return nil, err
	}

	if result.Code != 0 {
		return nil, errors.New(result.Msg)
	}

	return result.Data, nil
}

// endregion

func (c *gateway) requestGateway(method string, url string, data string) (*http.Response, error) {
	url = fmt.Sprintf("http://%s:%s@%s:9990%s", c.username, c.password, c.url, url)
	req, err := http.NewRequest(method, url, strings.NewReader(data))
	if err != nil {
		return nil, err
	}

	req.Header.Set("Content-Type", "application/json")

	if env.DebugHttpDump {
		str, err := httputil.DumpRequest(req, true)
		if err != nil {
			return nil, err
		}
		fmt.Println("==============================")
		fmt.Println(string(str))
	}

	resp, err := http.DefaultClient.Do(req)
	if err != nil {
		return nil, err
	}

	if env.DebugHttpDump {
		str, err := httputil.DumpResponse(resp, true)
		if err != nil {
			return nil, err
		}
		fmt.Println("------------------------------")
		fmt.Println(string(str))
	}

	return resp, nil
}