import { Provide } from "@midwayjs/core";
import { InjectRepository } from "@midwayjs/sequelize";
import { Repository } from "sequelize-typescript";
import { Op } from "sequelize";
import { Context } from "@midwayjs/koa";
import ElectricGateway from "../entity/electric_gateway.entity";
import Customer from "../entity/customer.entity";
import CustomerEquipment from "../entity/customer_equipment.entity";
import SysUserRole from "../entity/sysUserRole.entity";
import SysRole from "../entity/sysRole.entity";

@Provide()
export class ElectricGatewayService {
	@InjectRepository(ElectricGateway)
	gatewayModel!: Repository<ElectricGateway>;

	@InjectRepository(Customer)
	customerModel!: Repository<Customer>;

	@InjectRepository(CustomerEquipment)
	equipmentModel!: Repository<CustomerEquipment>;

	@InjectRepository(SysUserRole)
	userRoleModel!: Repository<SysUserRole>;

	@InjectRepository(SysRole)
	roleModel!: Repository<SysRole>;

	private async isAdmin(userId: number): Promise<boolean> {
		const userRoles = await this.userRoleModel.findAll({ where: { userId }, include: [this.roleModel] });
		return userRoles.some((ur) => (ur as any).role?.roleCode === "ADMIN");
	}

	async list(query: any, ctx: Context): Promise<any> {
		const page = Number(query.page) || 1;
		const pageSize = Number(query.pageSize) || 10;
		const userId = ctx.state.user.userId;
		const where: any = {};

		if (query.keyword) {
			where[Op.or] = [
				{ deviceName: { [Op.like]: `%${query.keyword}%` } },
				{ deviceCode: { [Op.like]: `%${query.keyword}%` } },
				{ iccImei: { [Op.like]: `%${query.keyword}%` } }
			];
		}
		if (query.customerId !== undefined && query.customerId !== "") where.customerId = Number(query.customerId);
		if (query.equipId !== undefined && query.equipId !== "") where.equipId = Number(query.equipId);
		if (query.isOnline !== undefined && query.isOnline !== "" && query.isOnline !== null) where.isOnline = Number(query.isOnline);

		// 非管理员按客户归属自动限定数据范围
		if (!(await this.isAdmin(userId))) {
			const myCustomers = await this.customerModel.findAll({ where: { salesmanId: userId }, attributes: ["id"] });
			const ids = myCustomers.map((c) => c.id);
			if (ids.length === 0) {
				return { code: 200, message: "获取网关台账列表成功", data: { list: [], total: 0, page: Number(page), pageSize: Number(pageSize) } };
			}
			if (where.customerId !== undefined) {
				if (!ids.includes(where.customerId)) {
					return { code: 200, message: "获取网关台账列表成功", data: { list: [], total: 0, page: Number(page), pageSize: Number(pageSize) } };
				}
			} else {
				where.customerId = { [Op.in]: ids };
			}
		}

		const { count, rows } = await this.gatewayModel.findAndCountAll({
			where,
			limit: pageSize,
			offset: (page - 1) * pageSize,
			order: [["created_at", "DESC"], ["id", "DESC"]],
			distinct: true
		});

		const list = await this.decorate(rows);
		return { code: 200, message: "获取网关台账列表成功", data: { list, total: count, page: Number(page), pageSize: Number(pageSize) } };
	}

	async detail(id: number, ctx: Context): Promise<any> {
		const record = await this.gatewayModel.findByPk(id);
		if (!record) return { code: 404, message: "网关设备不存在", data: null };

		if (!(await this.isAdmin(ctx.state.user.userId))) {
			const customer = await this.customerModel.findByPk(record.customerId);
			if (!customer || customer.salesmanId !== ctx.state.user.userId) {
				return { code: 403, message: "无权限访问该网关设备", data: null };
			}
		}

		const decorated = await this.decorate([record]);
		return { code: 200, message: "获取网关设备台账详情成功", data: decorated[0] };
	}

	/** 补全客户/设备展示信息，避免 N+1。 */
	private async decorate(rows: ElectricGateway[]): Promise<any[]> {
		if (rows.length === 0) return rows as any;

		const customerIds = [...new Set(rows.map((r) => r.customerId).filter(Boolean))];
		const equipIds = [...new Set(rows.map((r) => r.equipId).filter(Boolean))];

		const [customers, equips] = await Promise.all([
			customerIds.length
				? this.customerModel.findAll({
						where: { id: { [Op.in]: customerIds } },
						attributes: ["id", "customerNo", "customerName"]
				  })
				: Promise.resolve([]),
			equipIds.length
				? this.equipmentModel.findAll({
						where: { id: { [Op.in]: equipIds } },
						attributes: ["id", "equipCode", "equipName"]
				  })
				: Promise.resolve([])
		]);

		const customerMap = new Map(customers.map((c) => [c.id, c]));
		const equipMap = new Map(equips.map((e) => [e.id, e]));

		return rows.map((row) => {
			const json: any = row.toJSON();
			const customer: any = customerMap.get(row.customerId);
			const equip: any = row.equipId ? equipMap.get(row.equipId) : undefined;
			json.customerNo = customer?.customerNo || "";
			json.customerName = customer?.customerName || "";
			json.equipCode = equip?.equipCode || "";
			json.equipName = equip?.equipName || "";
			return json;
		});
	}
}