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

@Provide()
export class CustomerEquipmentService {
	@InjectRepository(CustomerEquipment)
	equipmentModel!: Repository<CustomerEquipment>;

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

	@InjectRepository(CustomerBuilding)
	buildingModel!: Repository<CustomerBuilding>;

	@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");
	}

	private async isCustomerOwner(userId: number, customerId: number): Promise<boolean> {
		if (await this.isAdmin(userId)) return true;
		const customer = await this.customerModel.findByPk(customerId);
		return !!customer && customer.salesmanId === userId;
	}

	private async generateEquipCode(retry: number = 0): Promise<string> {
		const now = new Date();
		const offsetMs = now.getTime() + 8 * 60 * 60 * 1000;
		const dateLocal = new Date(offsetMs);
		const yyyy = dateLocal.getUTCFullYear();
		const mm = String(dateLocal.getUTCMonth() + 1).padStart(2, "0");
		const dd = String(dateLocal.getUTCDate()).padStart(2, "0");
		const yyyymmdd = `${yyyy}${mm}${dd}`;

		const lastRecord = await this.equipmentModel.findOne({
			where: { equipCode: { [Op.like]: `EQ${yyyymmdd}%` } },
			order: [["equip_code", "DESC"]]
		});

		let newSeq = 1;
		if (lastRecord) {
			const lastNo = lastRecord.equipCode;
			const seqStr = lastNo.slice(-3);
			const seq = parseInt(seqStr, 10) || 0;
			newSeq = seq + 1;
		}

		const newSeqStr = String(newSeq).padStart(3, "0");
		const result = `EQ${yyyymmdd}${newSeqStr}`;

		const exists = await this.equipmentModel.findOne({ where: { equipCode: result } });
		if (exists) {
			if (retry < 1) {
				return this.generateEquipCode(retry + 1);
			}
			throw new Error("设备编码生成冲突，请重试");
		}

		return result;
	}

	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] = [
				{ equipCode: { [Op.like]: `%${query.keyword}%` } },
				{ equipName: { [Op.like]: `%${query.keyword}%` } },
				{ equipType: { [Op.like]: `%${query.keyword}%` } },
				{ location: { [Op.like]: `%${query.keyword}%` } }
			];
		}
		if (query.customerId !== undefined) where.customerId = query.customerId;
		if (query.buildingId !== undefined) where.buildingId = query.buildingId;
		if (query.equipType) where.equipType = query.equipType;

		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: "获取客户设备列表成功", data: { list: [], total: 0, page: Number(page), pageSize: Number(pageSize) } };
			}
			if (where.customerId !== undefined) {
				if (!ids.includes(where.customerId)) {
					return { code: 200, message: "获取客户设备列表成功", data: { list: [], total: 0, page: Number(page), pageSize: Number(pageSize) } };
				}
			} else {
				where.customerId = { [Op.in]: ids };
			}
		}

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

		return { code: 200, message: "获取客户设备列表成功", data: { list: rows.map((r) => r.toJSON()), total: count, page: Number(page), pageSize: Number(pageSize) } };
	}

	async detail(id: number, ctx: Context): Promise<any> {
		const record = await this.equipmentModel.findByPk(id);
		if (!record) return { code: 404, message: "客户设备不存在", data: null };
		if (!(await this.isCustomerOwner(ctx.state.user.userId, record.customerId))) return { code: 403, message: "无权限访问该设备", data: null };
		return { code: 200, message: "获取客户设备详情成功", data: record.toJSON() };
	}

	async create(data: any, ctx: Context): Promise<any> {
		if (!(await this.isCustomerOwner(ctx.state.user.userId, data.customerId))) return { code: 403, message: "无权限为该客户创建设备", data: null };

		try {
			data.equipCode = await this.generateEquipCode();
			const created = await this.equipmentModel.create(data);
			return { code: 200, message: "创建客户设备成功", data: created.toJSON() };
		} catch (err: any) {
			if (err instanceof UniqueConstraintError && err.errors?.some((e) => e.path === "equip_code" || e.path === "uk_equip_code")) {
				try {
					const equipCode = await this.generateEquipCode();
					const created = await this.equipmentModel.create({ ...data, equipCode });
					return { code: 200, message: "创建客户设备成功", data: created.toJSON() };
				} catch (_e) {
					return { code: 400, message: "设备编码冲突，请重试", data: null };
				}
			}
			throw err;
		}
	}

	async update(id: number, data: any, ctx: Context): Promise<any> {
		const record = await this.equipmentModel.findByPk(id);
		if (!record) return { code: 404, message: "客户设备不存在", data: null };
		if (!(await this.isAdmin(ctx.state.user.userId))) {
			if (!(await this.isCustomerOwner(ctx.state.user.userId, record.customerId))) return { code: 403, message: "无权限修改该设备", data: null };
			delete data.customerId;
		}

		delete data.equipCode;
		delete data.createdAt;
		delete data.created_at;

		try {
			await record.update(data);
			return { code: 200, message: "更新客户设备成功", data: record.toJSON() };
		} catch (err: any) {
			if (err instanceof UniqueConstraintError) {
				return { code: 400, message: "设备编码已存在", data: null };
			}
			throw err;
		}
	}

	async delete(id: number, ctx: Context): Promise<any> {
		const record = await this.equipmentModel.findByPk(id);
		if (!record) return { code: 404, message: "客户设备不存在", data: null };
		if (!(await this.isCustomerOwner(ctx.state.user.userId, record.customerId))) return { code: 403, message: "无权限删除该设备", data: null };
		await record.destroy();
		return { code: 200, message: "删除客户设备成功", data: null };
	}
}