package api

import (
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"reflect"
	"strconv"
	"strings"

	"git.sati.ac/sati.ac/sati-go"
	"github.com/mitchellh/mapstructure"
	"github.com/sirupsen/logrus"
)

type antigateV2Api struct {
	ctx *ApiContext
	mux *http.ServeMux
}

func (a *antigateV2Api) Name() string {
	return "AntiGateV2"
}

func (a *antigateV2Api) Domains() []string {
	return []string{"api.anti-captcha.com"}
}

func (a *antigateV2Api) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	a.mux.ServeHTTP(w, r)
}

type antigateError struct {
	ErrorId          uint32 `json:"errorId"`
	ErrorCode        string `json:"errorCode"`
	ErrorDescription string `json:"errorDescription"`
}

var (
	errorNoSuchMethod = &antigateError{
		ErrorId:          14,
		ErrorCode:        "ERROR_NO_SUCH_METHOD",
		ErrorDescription: "Request made to API with a method that does not exist",
	}

	errorCaptchaUnsolvable = &antigateError{
		ErrorId:          12,
		ErrorCode:        "ERROR_CAPTCHA_UNSOLVABLE",
		ErrorDescription: "Captcha unsolvable",
	}

	errorNoSuchCaptchaId = &antigateError{
		ErrorId:          16,
		ErrorCode:        "ERROR_NO_SUCH_CAPCHA_ID",
		ErrorDescription: "The captcha you are requesting does not exist in your active captchas list or has expired",
	}

	errorTaskAbsent = &antigateError{
		ErrorId:          22,
		ErrorCode:        "ERROR_TASK_ABSENT",
		ErrorDescription: `"task" property is empty or not set in the createTask method`,
	}

	errorTaskNotSupported = &antigateError{
		ErrorId:          23,
		ErrorCode:        "ERROR_TASK_NOT_SUPPORTED",
		ErrorDescription: "Task type is not supported or typed incorrectly",
	}

	errorInternal = &antigateError{
		ErrorId:          1000,
		ErrorCode:        "ERROR_INTERNAL",
		ErrorDescription: "Internal error, check bridge logs",
	}

	errorBadRequest = &antigateError{
		ErrorId:          1001,
		ErrorCode:        "ERROR_BAD_REQUEST",
		ErrorDescription: "Bad request",
	}

	errorProxyConnectRefused = &antigateError{
		ErrorId:          25,
		ErrorCode:        "ERROR_PROXY_CONNECT_REFUSED",
		ErrorDescription: "Bad proxy",
	}
)

func (a *antigateV2Api) getTaskResult(request struct {
	TaskId any `json:"taskId"`
}) any {
	var taskId uint32
	switch id := request.TaskId.(type) {
	case float64:
		taskId = uint32(id)
	case string:
		parsed, err := strconv.ParseUint(id, 10, 32)
		if err != nil {
			return errorBadRequest
		}
		taskId = uint32(parsed)
	default:
		return errorBadRequest
	}

	task := a.ctx.Registry.Get(taskId)
	if task == nil {
		return errorNoSuchCaptchaId
	}

	if task.State == StateError {
		return errorCaptchaUnsolvable
	}

	response := &struct {
		ErrorId    uint   `json:"errorId"`
		Status     string `json:"status"`
		Solution   any    `json:"solution"`
		Cost       string `json:"cost"`
		Ip         string `json:"ip"`
		CreateTime int64  `json:"createTime"`
		EndTime    *int64 `json:"endTime,omitempty"`
		SolveCount uint   `json:"solveCount"`
	}{
		CreateTime: task.CreateTime,
		SolveCount: 1,
		Ip:         a.ctx.Config.AntiGateV2.Ip,
		Cost:       "0",
	}

	if task.State == StateProcessing {
		response.Status = "processing"
	} else {
		response.Status = "ready"
		response.EndTime = &task.EndTime
		response.Cost = task.Entity.Cost
		switch result := task.Result.(type) {
		case *sati.ReCaptcha2Result:
			response.Solution = struct {
				GRecaptchaResponse string `json:"gRecaptchaResponse"`
			}{result.Token}
		case *sati.TurnstileResult:
			response.Solution = struct {
				Token     string `json:"token"`
				UserAgent string `json:"userAgent"`
			}{result.Token, a.ctx.Config.AntiGateV2.TurnstileUserAgent}
		case *sati.FunCaptchaResult:
			response.Solution = struct {
				Token string `json:"token"`
			}{result.Token}
		default:
			return errorTaskNotSupported
		}
	}

	return response
}

func collectAntiGateV2Proxy(task any) *string {
	var proxy struct {
		ProxyType     string  `json:"proxyType"`
		ProxyAddress  string  `json:"proxyAddress"`
		ProxyPort     uint16  `json:"proxyPort"`
		ProxyLogin    *string `json:"proxyLogin"`
		ProxyPassword *string `json:"proxyPassword"`
	}
	if err := mapstructure.Decode(task, proxy); err != nil {
		return nil
	}

	if proxy.ProxyType == "" || proxy.ProxyAddress == "" || proxy.ProxyPort == 0 {
		return nil
	}

	credentials := ""
	if proxy.ProxyLogin != nil {
		credentials += *proxy.ProxyLogin
		if proxy.ProxyPassword != nil {
			credentials += ":" + *proxy.ProxyPassword
		}
		credentials += "@"
	}

	proxyStr := fmt.Sprintf("%s://%s%s:%d", proxy.ProxyType, credentials, proxy.ProxyAddress, proxy.ProxyPort)
	return &proxyStr
}

func (a *antigateV2Api) createTask(request struct {
	Task map[string]any `json:"task"`
}) any {
	taskType, ok := request.Task["type"].(string)
	if !ok {
		return errorTaskAbsent
	}
	taskType = strings.ToLower(taskType)

	var satiTask sati.AnyTask

	switch taskType {
	case "turnstiletask", "turnstiletaskproxyless":
		var task struct {
			WebsiteURL string  `json:"websiteURL"`
			WebsiteKey string  `json:"websiteKey"`
			Action     *string `json:"action"`
		}
		mapstructure.Decode(request.Task, &task)
		satiTask = &sati.TurnstileTask{
			PageUrl: task.WebsiteURL,
			SiteKey: task.WebsiteKey,
			Action:  task.Action,
		}
		if taskType == "turnstiletask" {
			proxy := collectAntiGateV2Proxy(request.Task)
			if proxy == nil {
				return errorProxyConnectRefused
			}
			satiTask.(*sati.TurnstileTask).Proxy = proxy
		}
	case "recaptchav2task", "recaptchav2taskproxyless":
		var task struct {
			WebsiteURL string `json:"websiteURL"`
			WebsiteKey string `json:"websiteKey"`
		}
		mapstructure.Decode(request.Task, &task)
		satiTask = &sati.ReCaptcha2Task{
			PageUrl: task.WebsiteURL,
			SiteKey: task.WebsiteKey,
		}
		if taskType == "funcaptchatask" {
			proxy := collectAntiGateV2Proxy(request.Task)
			if proxy == nil {
				return errorProxyConnectRefused
			}
			satiTask.(*sati.ReCaptcha2Task).Proxy = proxy
		}
	case "funcaptchatask", "funcaptchataskproxyless":
		var task struct {
			WebsiteURL       string            `json:"websiteURL"`
			WebsitePublicKey string            `json:"websitePublicKey"`
			Data             map[string]string `json:"data"`
		}
		mapstructure.Decode(request.Task, &task)
		satiTask = &sati.FunCaptchaTask{
			PageUrl: task.WebsiteURL,
			SiteKey: task.WebsitePublicKey,
			Data:    task.Data,
		}
		if taskType == "funcaptchatask" {
			proxy := collectAntiGateV2Proxy(request.Task)
			if proxy == nil {
				return errorProxyConnectRefused
			}
			satiTask.(*sati.FunCaptchaTask).Proxy = proxy
		}
	default:
		return errorTaskNotSupported
	}

	id := a.ctx.Registry.CreateTask(satiTask)

	return &struct {
		ErrorId uint32 `json:"errorId"`
		TaskId  uint32 `json:"taskId"`
	}{0, id}
}

func (a *antigateV2Api) getBalance(struct{}) any {
	balance, err := a.ctx.Api.GetBalance()
	if err != nil {
		a.ctx.Logger.WithFields(logrus.Fields{
			"handler": a.Name(),
			"method":  "getBalance",
		}).Error(err.Error())
		return errorInternal
	}

	return &struct {
		ErrorId        uint    `json:"errorId"`
		CaptchaCredits uint    `json:"captchaCredits"`
		Balance        float64 `json:"balance"`
	}{0, 0, balance.InexactFloat64()}
}

func jsonHandler[T any](api *antigateV2Api, handler func(data T) any) func(http.ResponseWriter, *http.Request) {
	emptyRequest := reflect.Zero(reflect.TypeOf(handler).In(0)).Interface().(T)

	return func(w http.ResponseWriter, r *http.Request) {
		w.Header().Add("Content-Type", "application/json")

		data, _ := io.ReadAll(r.Body)
		request := emptyRequest
		if err := json.Unmarshal(data, &request); err != nil {
			marshaled, _ := json.Marshal(errorBadRequest)
			w.Write(marshaled)
			return
		}

		api.ctx.Logger.WithFields(logrus.Fields{"handler": api.Name(), "request": request}).Debug("request")
		response := handler(request)
		api.ctx.Logger.WithFields(logrus.Fields{"handler": api.Name(), "response": response}).Debug("response")

		marshaled, _ := json.Marshal(response)

		if _, ok := response.(*antigateError); ok {
			w.WriteHeader(400)
		}

		w.Write(marshaled)
	}
}

func newAntigateV2Api(ctx *ApiContext) ApiHandler {
	api := &antigateV2Api{ctx, http.NewServeMux()}

	api.mux.HandleFunc("/createTask", jsonHandler(api, api.createTask))
	api.mux.HandleFunc("/getTaskResult", jsonHandler(api, api.getTaskResult))
	api.mux.HandleFunc("/getBalance", jsonHandler(api, api.getBalance))

	return api
}