import { Provide, Inject } from "@midwayjs/core";
import { InjectRepository } from "@midwayjs/sequelize";
import SysUser from "../entity/sysUser.entity";
import SysOperationLog from "../entity/sysOperationLog.entity";
import dayjs from "dayjs";
import { Op } from "sequelize";

@Provide()
export class DashboardService {
	@InjectRepository(SysOperationLog)
	logModel!: typeof SysOperationLog;

	async getDashboardStats(): Promise<any> {
		const mockDeviceTotal = 1256;
		const mockDeviceOnline = 1089;
		const mockAlertToday = 23;

		const activeUsers = await this.getActiveUserCount(7);

		const loginTrend = await this.getLoginTrend(7);

		const deviceTrend = this.generateMockTrend(7, 900, 1100);

		const deviceDistribution = [
			{ name: "智能电表", value: 456 },
			{ name: "环境传感器", value: 328 },
			{ name: "摄像头", value: 245 },
			{ name: "门禁系统", value: 147 },
			{ name: "其他设备", value: 80 }
		];

		const recentAlerts = this.generateMockAlerts(10);

		const recentActivities = await this.getRecentActivities(10);

		return {
			deviceTotal: mockDeviceTotal,
			deviceOnline: mockDeviceOnline,
			alertToday: mockAlertToday,
			activeUsers,
			deviceTrend,
			deviceTypeDistribution: deviceDistribution,
			recentAlerts,
			recentActivities
		};
	}

	private async getActiveUserCount(days: number): Promise<number> {
		const cutoffDate = dayjs().subtract(days, "day").toDate();

		try {
			const count = await this.logModel.count({
				where: {
					action: "用户登录",
					created_at: { [Op.gte]: cutoffDate }
				},
				distinct: true,
				col: "userId"
			});

			return count || 12;
		} catch (error) {
			return 12;
		}
	}

	private async getLoginTrend(days: number): Promise<any[]> {
		const trend = [];

		for (let i = days - 1; i >= 0; i--) {
			const date = dayjs().subtract(i, "day").format("YYYY-MM-DD");

			try {
				const count = await this.logModel.count({
					where: {
						action: "用户登录",
						created_at: {
							[Op.between]: [dayjs(date).startOf("day").toDate(), dayjs(date).endOf("day").toDate()]
						}
					}
				});

				trend.push({
					date,
					value: count || Math.floor(Math.random() * 50) + 20
				});
			} catch (error) {
				trend.push({
					date,
					value: Math.floor(Math.random() * 50) + 20
				});
			}
		}

		return trend;
	}

	private async getRecentActivities(limit: number): Promise<any[]> {
		try {
			const logs = await this.logModel.findAll({
				order: [["created_at", "DESC"]],
				limit,
				attributes: ["id", "action", "module", "ip", "created_at"]
			});

			return logs.map((log) => ({
				id: log.id,
				user: String(log.userId || "系统"),
				action: log.action,
				module: log.module,
				ip: log.ip,
				time: dayjs(log.created_at).format("MM-DD HH:mm")
			}));
		} catch (error) {
			return this.generateMockActivities(limit);
		}
	}

	private generateMockTrend(days: number, min: number, max: number): any[] {
		const trend = [];

		for (let i = days - 1; i >= 0; i--) {
			trend.push({
				date: dayjs().subtract(i, "day").format("YYYY-MM-DD"),
				online: Math.floor(Math.random() * (max - min)) + min,
				offline: Math.floor(Math.random() * 200) + 50
			});
		}

		return trend;
	}

	private generateMockAlerts(count: number): any[] {
		const alertTypes = ["离线告警", "异常数据", "通信故障", "电量低", "温度超标"];
		const devices = ["电表#1001", "传感器#2003", "摄像头#3012", "门禁#4005"];
		const levels = ["high", "medium", "low"];

		const alerts = [];

		for (let i = 0; i < count; i++) {
			alerts.push({
				id: i + 1,
				type: alertTypes[Math.floor(Math.random() * alertTypes.length)],
				device: devices[Math.floor(Math.random() * devices.length)],
				level: levels[Math.floor(Math.random() * levels.length)],
				time: dayjs()
					.subtract(Math.floor(Math.random() * 60), "minute")
					.format("HH:mm"),
				status: Math.random() > 0.5 ? "pending" : "resolved"
			});
		}

		return alerts.sort((a, b) => a.time.localeCompare(b.time));
	}

	private generateMockActivities(count: number): any[] {
		const actions = [
			{ user: "管理员", action: "用户登录", module: "认证" },
			{ user: "操作员A", action: "修改设备配置", module: "设备管理" },
			{ user: "管理员", action: "创建新用户", module: "用户管理" },
			{ user: "操作员B", action: "查看告警列表", module: "监控中心" },
			{ user: "系统", action: "自动备份完成", module: "系统" },
			{ user: "操作员A", action: "导出数据报表", module: "数据分析" },
			{ user: "管理员", action: "更新系统配置", module: "系统设置" },
			{ user: "操作员C", action: "处理告警事件", module: "监控中心" },
			{ user: "系统", action: "定时任务执行", module: "系统" },
			{ user: "操作员B", action: "添加新设备", module: "设备管理" }
		];

		return actions.slice(0, count).map((item, index) => ({
			id: index + 1,
			...item,
			ip: "192.168.1." + Math.floor(Math.random() * 255),
			time: dayjs()
				.subtract(index * 30, "minute")
				.format("MM-DD HH:mm")
		}));
	}
}