package api

import (
	"context"
	"encoding/base64"
	"encoding/json"
	"errors"
	"fmt"
	"net/http"
	"net/url"
	"time"

	hub "git.ipao.vip/rogee/creator-hub/internal/environment"
	douyin "git.ipao.vip/rogee/creator-hub/internal/platform/douyin"
)

type douyinGatewayBrowser struct {
	gateway     hub.Gateway
	environment hub.EnvironmentContext
}

type douyinGatewayRequest struct {
	BindingVersion int64  `json:"binding_version"`
	RuntimeID      string `json:"runtime_id"`
	NetworkID      string `json:"network_id"`
	NetworkExitID  string `json:"network_exit_id"`
	URL            string `json:"url,omitempty"`
}

type douyinLoginQRResponse struct {
	ContentType string `json:"content_type"`
	BodyBase64  string `json:"body_base64"`
	QRDetected  bool   `json:"qr_detected"`
}

const maxCreatorLoginQRBytes = 8 << 20

func (browser douyinGatewayBrowser) LoginQR(ctx context.Context) (douyinLoginQRResponse, error) {
	payload := gatewayGenerationPayload(browser.environment)
	status, body, err := gatewayCallWithLimit(ctx, browser.gateway, http.MethodPost,
		"/v1/browsers/"+url.PathEscape(browser.environment.Alias)+"/douyin/login-qr", payload, 30*time.Second, largeGatewayResponseLimit)
	if err != nil {
		return douyinLoginQRResponse{}, err
	}
	if status != http.StatusOK {
		return douyinLoginQRResponse{}, fmt.Errorf("douyin login screen request rejected with HTTP %d: %s", status, string(body))
	}
	var response douyinLoginQRResponse
	if err := json.Unmarshal(body, &response); err != nil {
		return douyinLoginQRResponse{}, fmt.Errorf("decode douyin login screen response: %w", err)
	}
	if response.ContentType != "image/png" || response.BodyBase64 == "" {
		return douyinLoginQRResponse{}, errors.New("douyin login screen response is invalid")
	}
	data, err := base64.StdEncoding.DecodeString(response.BodyBase64)
	if err != nil || len(data) == 0 || len(data) > maxCreatorLoginQRBytes {
		return douyinLoginQRResponse{}, errors.New("douyin login screen response is invalid")
	}
	return response, nil
}

func (browser douyinGatewayBrowser) Get(ctx context.Context, target string) (douyin.Response, error) {
	request, err := browser.request()
	if err != nil {
		return douyin.Response{}, err
	}
	request.URL = target
	status, body, err := gatewayCall(ctx, browser.gateway, http.MethodPost,
		"/v1/browsers/"+url.PathEscape(browser.environment.Alias)+"/douyin/get", request, 30*time.Second)
	if err != nil || status != http.StatusOK {
		return douyin.Response{}, errors.New("restricted browser operation failed")
	}
	var response struct {
		Status    int              `json:"status"`
		Body      string           `json:"body"`
		Challenge douyin.Challenge `json:"challenge"`
	}
	if json.Unmarshal(body, &response) != nil || response.Status < 100 || response.Status > 599 ||
		(response.Challenge != douyin.ChallengeNone && response.Challenge != douyin.ChallengeCaptcha &&
			response.Challenge != douyin.ChallengeDevice) {
		return douyin.Response{}, errors.New("restricted browser returned an invalid response")
	}
	return douyin.Response{Status: response.Status, Body: []byte(response.Body), Challenge: response.Challenge}, nil
}

type douyinHistoryMessage struct {
	ServerID    string          `json:"server_id"`
	SenderUID   string          `json:"sender_uid"`
	MessageType string          `json:"message_type"`
	Content     json.RawMessage `json:"content"`
	CreatedAt   string          `json:"created_at"`
	ServerState *int            `json:"server_status"`
}

type douyinMessageHistory struct {
	Status         string                 `json:"status"`
	HistorySource  string                 `json:"history_source"`
	HistoryCursor  string                 `json:"history_cursor"`
	HistoryHasMore bool                   `json:"history_has_more"`
	AccountUID     string                 `json:"account_uid"`
	Conversation   map[string]any         `json:"conversation"`
	Messages       []douyinHistoryMessage `json:"messages"`
}

func (browser douyinGatewayBrowser) request() (douyinGatewayRequest, error) {
	environment := browser.environment
	if browser.gateway.Endpoint == "" || browser.gateway.Token == "" || !accountRunnable(environment) ||
		!gatewayGenerationIDPattern.MatchString(environment.AccountID) || !gatewayGenerationIDPattern.MatchString(environment.Alias) ||
		!gatewayGenerationIDPattern.MatchString(environment.BindingID) ||
		!gatewayGenerationIDPattern.MatchString(environment.Exit.ID) || environment.Exit.HealthStatus != "healthy" || environment.RuntimeCleanupPending ||
		!gatewayGenerationIDPattern.MatchString(environment.RuntimeInstanceID) || !gatewayGenerationIDPattern.MatchString(environment.RuntimeID) ||
		!gatewayGenerationIDPattern.MatchString(environment.RuntimeNetworkID) ||
		environment.BindingVersion < 1 {
		return douyinGatewayRequest{}, errors.New("restricted browser is not ready")
	}
	return douyinGatewayRequest{BindingVersion: environment.BindingVersion, RuntimeID: environment.RuntimeID,
		NetworkID: environment.RuntimeNetworkID, NetworkExitID: environment.Exit.ID}, nil
}