import PointAPI from "@/api/PointAPI";
import type { PointRule } from "@/types/Point";

/**
 * 查询一组事件可用的自定义积分范围，并返回所有规则范围的交集。
 *
 * @param eventIdList 事件 ID 列表
 * @returns 可用范围；没有完整有效的 SOURCE_VALUE 规则时返回 undefined
 */
export async function loadSourceValueRange(eventIdList: string[]): Promise<[number, number] | undefined> {
	if (!eventIdList.length) {
		return undefined;
	}

	const resultList = await Promise.all(eventIdList.map(eventId => PointAPI.ruleList({
		index: 0,
		size: 1000,
		equalsExample: {
			eventId,
			status: "ACTIVE"
		}
	})));
	const ruleList = resultList
		.flatMap(result => result.list || [])
		.filter(isSourceValueRule);
	if (!ruleList.length) {
		return undefined;
	}

	const rangeList = ruleList
		.map(rule => ({ min: rule.conditionJson?.min, max: rule.conditionJson?.max }))
		.filter((range): range is { min: number; max: number } => (
			range.min !== undefined
			&& range.max !== undefined
			&& Number.isSafeInteger(range.min)
			&& Number.isSafeInteger(range.max)
			&& 0 < range.min
			&& 0 < range.max
		));
	if (rangeList.length !== ruleList.length) {
		return undefined;
	}

	const min = Math.max(...rangeList.map(range => range.min), 1);
	const max = Math.min(...rangeList.map(range => range.max));
	return min <= max ? [min, max] : undefined;
}

function isSourceValueRule(rule: PointRule): boolean {
	return rule.status === "ACTIVE" && rule.triggerType === "SOURCE_VALUE" && rule.pointMode === "SOURCE_VALUE";
}