import type { Product, ProductCategoryStatus, ProductSku, ProductSpec, ProductSpecValue, ProductStatus, ProductType, StockOperationType } from "@/types/Product";
import { getAttachmentReadURL } from "@/utils/attachment.ts";

/** 生成产品域写操作的幂等请求号。一次失败重试应复用调用方已经生成的请求号。 */
export function createProductRequestNo(): string {
	return window.crypto.randomUUID();
}

/** 将分转换成金额展示文本。金额不使用浮点数格式化。 */
export function formatProductAmount(cents?: number | null): string {
	if (cents === undefined || cents === null) {
		return "未设置";
	}

	const negative = cents < 0;
	const absolute = Math.abs(Math.trunc(cents));
	return `${negative ? "-" : ""}${Math.floor(absolute / 100)}.${String(absolute % 100).padStart(2, "0")}`;
}

/** 将元金额输入精确转换为分。 */
export function parseProductAmount(value: string): number | undefined {
	const text = value.trim();
	if (!/^\d+(?:\.\d{1,2})?$/.test(text)) {
		return undefined;
	}

	const [yuanText, fenText = ""] = text.split(".");
	const cents = BigInt(yuanText) * 100n + BigInt(fenText.padEnd(2, "0") || "0");
	const result = Number(cents);
	return Number.isSafeInteger(result) ? result : undefined;
}

/** 规范化最多三位小数的非负数量。 */
export function normalizeProductQuantity(value: number | string): string | undefined {
	const text = String(value).trim();
	if (!/^\d+(?:\.\d{1,3})?$/.test(text)) {
		return undefined;
	}

	const [integerText, fractionText = ""] = text.split(".");
	const integer = integerText.replace(/^0+(?=\d)/, "") || "0";
	const fraction = fractionText.replace(/0+$/, "");
	return fraction ? `${integer}.${fraction}` : integer;
}

/** 根据产品数量规则返回数量控件步长。允许小数时固定步进 0.1。 */
export function getProductQuantityStep(sku?: Pick<ProductSku, "allowDecimalQuantity">): number {
	return sku?.allowDecimalQuantity ? .1 : 1;
}

export function getProductTypeText(type?: ProductType): string {
	return ({ SERVICE: "服务", GOODS: "实物", CONSUMABLE: "消耗品" } as Record<string, string>)[type || ""] || "未知";
}

export function getProductStatusText(status?: ProductStatus): string {
	return ({ ACTIVE: "启用", INACTIVE: "停用" } as Record<string, string>)[status || ""] || "未知";
}

export function getProductStatusTheme(status?: ProductStatus): "success" | "warning" | "default" {
	return status === "ACTIVE" ? "success" : status === "INACTIVE" ? "warning" : "default";
}

export function getProductCategoryStatusText(status?: ProductCategoryStatus): string {
	return ({ ACTIVE: "启用", INACTIVE: "停用" } as Record<string, string>)[status || ""] || "未知";
}

export function getProductCategoryStatusTheme(status?: ProductCategoryStatus): "success" | "warning" | "default" {
	return status === "ACTIVE" ? "success" : status === "INACTIVE" ? "warning" : "default";
}

export function getStockOperationText(type?: StockOperationType): string {
	return ({
		INITIAL_IN: "期初入库",
		MANUAL_IN: "手工入库",
		MANUAL_OUT: "手工出库",
		MANUAL_REVOKE: "手工流水冲正",
		ORDER_RESERVE: "履约预占",
		ORDER_RELEASE: "履约释放预占",
		ORDER_OUT: "履约出库",
		ORDER_REVOKE: "履约冲正入库",
		STOCKTAKE_GAIN: "盘盈",
		STOCKTAKE_LOSS: "盘亏"
	} as Record<string, string>)[type || ""] || "未知操作";
}

export function getProductPhotoURL(item: Pick<Product | ProductSku, "attachmentList">): string {
	const attachment = item.attachmentList?.find(item => item.attachType === "PHOTO" && !!item.id);
	return attachment?.id ? getAttachmentReadURL(attachment.id, 128) : "";
}

/** 将数量转换成稳定的展示文本，兼容后端 BigDecimal 字符串。 */
export function getProductQuantityText(value?: number | string | null): string {
	if (value === undefined || value === null || value === "") {
		return "0";
	}
	return normalizeProductQuantity(value) || "0";
}

/** 从产品单位列表中获取基础单位名称。 */
export function getProductBaseUnitName(sku?: ProductSku): string {
	return sku?.unitList?.find(unit => unit.isBase)?.name || "";
}

/** 组合产品名、SKU 名称和规格摘要，供选品后的业务页面统一展示。 */
export function getProductSkuText(productName: string | undefined, sku?: Pick<ProductSku, "name" | "specSummary">): string {
	const skuText = sku?.specSummary || sku?.name;
	return skuText && skuText !== productName ? `${productName || "未命名产品"} · ${skuText}` : productName || "未命名产品";
}

export type ProductSkuSpecEntry = {
	specName: string;
	valueName: string;
};

type ProductEditorSpec = Pick<ProductSpec, "name"> & {
	valueList?: Array<Pick<ProductSpecValue, "id" | "name"> & { clientKey?: string }>;
};

/** 根据 SKU 保存的规格值 ID，返回可直接展示的规格项和规格值。 */
export function getProductSkuSpecEntries(sku: Pick<ProductSku, "specValueIdList">, specList: ProductEditorSpec[]): ProductSkuSpecEntry[] {
	const valueIdSet = new Set(sku.specValueIdList || []);
	return specList.flatMap((spec, specIndex) => {
		const value = (spec.valueList || []).find(item => valueIdSet.has(item.id || item.clientKey || ""));
		if (!value) {
			return [];
		}
		return [{
			specName: spec.name.trim() || `规格项 ${specIndex + 1}`,
			valueName: value.name.trim() || "未命名规格值"
		}];
	});
}