import type { EventValueUnit } from "@/types/EventItem";
import type { PointRuleTierForm } from "@/types/Point";
import { formatCentValue, resolveCentValue } from "@/utils/eventValue";

export function resolveNonNegativeInteger(value: string): number | undefined {
	if (!value.trim()) {
		return undefined;
	}
	const numberValue = Number(value);
	return Number.isSafeInteger(numberValue) && !(numberValue < 0) ? numberValue : undefined;
}

/**
 * 按来源事件的存储单位解析分档边界。
 * CENT 的表单值使用元，解析结果使用分；COUNT 直接使用整数次数。
 */
export function resolveTierBoundaryValue(value: string, valueUnit?: EventValueUnit | null): number | undefined {
	return valueUnit === "CENT" ? resolveCentValue(value.trim()) : resolveNonNegativeInteger(value);
}

/**
 * 按来源事件的展示单位格式化分档边界。
 */
export function formatTierBoundaryValue(value: number, valueUnit?: EventValueUnit | null): string {
	return valueUnit === "CENT" ? formatCentValue(value) : String(value);
}

export function getTierMinValue(tierList: PointRuleTierForm[], index: number, valueUnit?: EventValueUnit | null): number | undefined {
	if (index < 1) {
		return resolveTierBoundaryValue(tierList[0]?.minText || "", valueUnit);
	}
	const previousMax = resolveTierBoundaryValue(tierList[index - 1]?.maxText || "", valueUnit);
	if (previousMax === undefined || !Number.isSafeInteger(previousMax + 1)) {
		return undefined;
	}
	return previousMax + 1;
}

export function getTierMinText(tierList: PointRuleTierForm[], index: number, valueUnit?: EventValueUnit | null): string {
	const min = getTierMinValue(tierList, index, valueUnit);
	return min === undefined ? "待填写" : formatTierBoundaryValue(min, valueUnit);
}

export function isLastTier(tierList: PointRuleTierForm[], index: number): boolean {
	return index === tierList.length - 1;
}