package parking

import (
	"errors"
	"fmt"
	"net/url"
	"strings"

	"wails-app/internal/dao"
	"wails-app/internal/global"
)

// CameraStreamOption 是工作台使用的安全摄像头信息，不包含用户名和密码。
type CameraStreamOption struct {
	DeviceCode  string `json:"device_code"`
	DeviceName  string `json:"device_name"`
	ChannelID   uint   `json:"channel_id"`
	ChannelCode string `json:"channel_code"`
	ChannelName string `json:"channel_name"`
	Protocol    string `json:"protocol"`
	PlayURL     string `json:"play_url"`
	SnapshotURL string `json:"snapshot_url"`
	Status      string `json:"status"`
	Online      bool   `json:"online"`
}

// ListCameraStreams 返回启用摄像头的浏览器播放配置，并按通道绑定到道闸设备。
func (s *PassageService) ListCameraStreams() ([]CameraStreamOption, error) {
	if global.GVA_DB == nil {
		return nil, errors.New("数据库未初始化")
	}
	var cameras []dao.Camera
	if err := global.GVA_DB.Preload("BoundChannel").Where("is_active = ?", true).
		Order("device_name ASC").Find(&cameras).Error; err != nil {
		return nil, err
	}

	options := make([]CameraStreamOption, 0, len(cameras))
	for _, camera := range cameras {
		protocol := camera.StreamProtocol
		if protocol == "" {
			protocol = "webrtc"
		}
		playURL := camera.StreamURL
		systemConversionEnabled := strings.ToLower(strings.TrimSpace(global.GVA_CONFIG.Camera.ConversionMode)) != "edge"
		if systemConversionEnabled && isSystemMJPEG(protocol) {
			token := issueCameraStreamToken(camera.DeviceCode)
			prefix := global.GVA_CONFIG.System.RouterPrefix
			if prefix == "" {
				prefix = "/api"
			}
			playURL = fmt.Sprintf("%s/parking/camera/stream/%s/%s", strings.TrimRight(prefix, "/"), url.PathEscape(camera.DeviceCode), token)
			protocol = "mjpeg"
		} else if isSystemMJPEG(protocol) {
			// 切到 edge 模式后，沿用数据库中的 StreamURL（由边缘或外部媒体网关提供）。
			protocol = "webrtc"
		}
		status := camera.Status
		if status == "" {
			status = "offline"
		}
		options = append(options, CameraStreamOption{
			DeviceCode:  camera.DeviceCode,
			DeviceName:  camera.DeviceName,
			ChannelID:   camera.ChannelID,
			ChannelCode: cameraChannelCode(camera.BoundChannel),
			ChannelName: cameraChannelName(camera.BoundChannel),
			Protocol:    protocol,
			PlayURL:     playURL,
			SnapshotURL: camera.SnapshotURL,
			Status:      status,
			Online:      camera.Status == "online" || camera.Status == "connected",
		})
	}
	return options, nil
}

func cameraChannelCode(channel *dao.Channel) string {
	if channel == nil {
		return ""
	}
	return channel.ChannelCode
}

func cameraChannelName(channel *dao.Channel) string {
	if channel == nil {
		return ""
	}
	return channel.ChannelName
}