// src/lib/slugMap.ts
import { categories } from "@/data/categories";

export type PageType =
  | "article_home"
  | "article_category"
  | "article_detail"
  | "product_category"
  | "product_detail";

export type SlugResult =
  | { type: "article_home" }
  | { type: "article_category"; slug: string }
  | { type: "article_detail"; slug: string }
  | { type: "product_category"; slug: string }
  | { type: "product_detail"; slug: string };

export function findBySlug(rawSlug: string): SlugResult {
    const slug = normalizeSlug(rawSlug);
    const url = "/" + slug;

    /* 1. ARTICLE HOME */
    if (url === "/tin-tuc") {
        return { type: "article_home" };
    }

    /* 2. ARTICLE CATEGORY */
    const articleCats = categories.article.all_category.article;
    for (const parent of articleCats) {
        if (parent.url === url) {
            return { type: "article_category", slug };
        }

        for (const child of parent.children ?? []) {
            if (child.url === url) {
                return { type: "article_category", slug };
            }
        }
    }

    /* 3. PRODUCT CATEGORY */
    const productCats = categories.product.all_category;
    for (const cat of productCats) {
        if (cat.url === url) {
            return { type: "product_category", slug };
        }

        for (const child of cat.children ?? []) {
            if (child.url === url) {
                return { type: "product_category", slug };
            }
        }
    }

    /* 4. PRODUCT DETAIL   */
    if (isProductDetailSlug(slug)) {
        return { type: "product_detail", slug };
    }

    /* 5. ARTICLE DETAIL (fallback) */
    return { type: "article_detail", slug };
}

/* ===============================
 * HELPERS
 * =============================== */
function normalizeSlug(slug: string) {
    return slug.replace(/^\/+/, "").trim();
}

function isProductDetailSlug(slug: string) {
    return (
        slug.startsWith("hhpc-") ||
        slug.startsWith("pc-") ||
        slug.startsWith("man-hinh-")
    );
}