import { Observable, Subject } from "rxjs";
import { produce, immerable, setAutoFreeze } from "immer";
import { DecSafeAny, TableListColumns, TableOperation } from "../types";
import { EventEmitter } from "@angular/core";

type IfetchData = (...args: DecSafeAny[]) => Observable<DecSafeAny>;

type ITableListConfig = {
	manual?: boolean;
	cacheKey?: string;
	cacheTo?: string[];
	rowKey?: string;
	columnKey?: string;
	selectable?: boolean;
	withOutDefaultColumns?: boolean;
	theadSettable?: boolean;
	pageFromZero?: boolean;
	frontPagination?: boolean;
};

type TableListState = {
	selectedKeys: string[];
};

type TableListPager = {
	page: number;
	size: number;
	total: number;
	loading: boolean;
	sort: { [K: string]: "ascend" | "descend" };
};

setAutoFreeze(false);

export class TableListOption {
	[immerable] = true;

	trigger$ = new Subject<DecSafeAny>();

	getState$ = new EventEmitter<TableListState>();

	columns: TableListColumns[] = [];

	operations!: TableOperation[];

	fetchData: IfetchData;

	manual?: boolean = false;

	cacheKey?: string;

	cacheTo?: string[];

	rowKey: string;

	columnKey?: string;

	selectable: boolean = false;

	withOutDefaultColumns?: boolean;

	pageFromZero?: boolean;

	theadSettable: boolean = false;

	frontPagination: boolean = true;

	scroll: { x?: string | null; y?: string | null } = { x: "2000px", y: null };

	pager: TableListPager = {
		page: 1,
		size: 5,
		loading: false,
		total: 0,
		sort: {},
	};

	constructor(fetchData: IfetchData, config?: ITableListConfig) {
		this.fetchData = fetchData;
		this.manual = config?.manual;
		this.cacheKey = config?.cacheKey;
		this.cacheTo = config?.cacheTo;
		this.rowKey = config?.rowKey ?? "id";
		this.selectable = config?.selectable ?? false;
		this.withOutDefaultColumns = config?.withOutDefaultColumns;
		this.theadSettable = config?.theadSettable ?? false;
		this.columnKey = config?.columnKey;
		this.pageFromZero = config?.pageFromZero;
		this.frontPagination = config?.frontPagination ?? true;
	}

	/**
	 * 设置表格的列，❗❗不可变数据❗❗
	 * @param columns TableListColumns
	 * @returns
	 */
	setColumns(columns: TableListColumns[]) {
		return produce(this, (draft) => {
			// if (!this.withOutDefaultColumns) {
			// 	columns = columns.concat(
			// 		{ key: "createTime", title: "创建时间", sort: true },
			// 		{ key: "updateTime", title: "更新时间", sort: true, visible: false }
			// 	);
			// 	draft.pager.sort = { createTime: "descend" };
			// }
			draft.columns = columns;
		});
	}

	/**
	 * 设置表格的操作项，❗❗不可变数据❗❗
	 * @param columns TableListColumns
	 * @returns
	 */
	setOptions(operations: TableOperation[]) {
		return produce(this, (draft) => {
			draft.operations = operations;
		});
	}

	/**
	 * 设置表格CacheKey，❗❗不可变数据❗❗
	 * @param columns TableListColumns
	 * @returns
	 */
	setCacheKey(cacheKey: string) {
		return produce(this, (draft) => {
			draft.cacheKey = cacheKey;
		});
	}

	run(e?: DecSafeAny) {
		setTimeout(() => {
			// 防止 还没有 subscribe 就 next 了
			this.trigger$.next(e);
		}, 10);
	}

	reset() {
		this.pager.page = 1;
		this.run();
	}
}