import type {
  ParsedRecipe,
  RecipeSourceAdapter,
  RecipeSourceListItem,
  RecipeSourceListParams,
  RecipeSourceListResult,
} from "../lib/recipe-sources/recipe-source-adapter.js";
import {
  RecipeSourceFetchError,
  RecipeSourceParseError,
} from "../lib/recipe-sources/recipe-source-errors.js";
import { jsonLdRecipeAdapter } from "./json-ld-recipe.js";

const SOURCE_KEY = "ohMonBento";
const SITE_ORIGIN = "https://ohmonbento.com";

/** One recipe card scraped off an ohmonbento.com search page — see {@link extractRecipeCards}. */
interface OhMonBentoCard {
  url: string;
  title: string;
  image: string | null;
}

/**
 * Scrapes every recipe card out of an ohmonbento.com search results page.
 * Each card is a `<div class="entry-thumb">` wrapping a single
 * `<a href="/<slug>/">` with one `<img>` inside — no `ItemList` JSON-LD
 * (unlike marmiton.ts) and no lazy-load `data-src` dance (unlike
 * quitoque.ts): the real image is just the `<img>`'s `src`. `href` is a
 * root-relative path, resolved against {@link SITE_ORIGIN} here.
 * Attribute-order-agnostic.
 */
function extractRecipeCards(html: string): OhMonBentoCard[] {
  const cards: OhMonBentoCard[] = [];
  const thumbPattern = /<div\s+[^>]*class="[^"]*\bentry-thumb\b[^"]*"[^>]*>([\s\S]*?)<\/div>/g;
  for (const match of html.matchAll(thumbPattern)) {
    const block = match[1] ?? "";
    const href = /<a\s+[^>]*\bhref="([^"]+)"/.exec(block)?.[1];
    if (href === undefined) continue;
    const title = /\balt="([^"]*)"/.exec(block)?.[1] ?? "";
    if (title.length === 0) continue;
    const url = href.startsWith("http") ? href : `${SITE_ORIGIN}${href}`;
    cards.push({ url, title, image: /\bsrc="([^"]+)"/.exec(block)?.[1] ?? null });
  }
  return cards;
}

/**
 * Re-labels a `RecipeSourceFetchError`/`RecipeSourceParseError` thrown by
 * the generic `jsonLdRecipeAdapter` (`sourceKey` `"jsonLdRecipe"`) as this
 * adapter's (`sourceKey` `"ohMonBento"`) — same reasoning as marmiton.ts's
 * identically-named helper. (Not factored out into a shared helper —
 * marmiton/750g/manger-bouger/quitoque each keep their own copy; the
 * near-identical five-liner isn't worth a module.)
 */
function rekeySourceError(err: unknown): unknown {
  if (err instanceof RecipeSourceFetchError) {
    return new RecipeSourceFetchError(SOURCE_KEY, err.message, { cause: err.cause });
  }
  if (err instanceof RecipeSourceParseError) {
    return new RecipeSourceParseError(SOURCE_KEY, err.message, { cause: err.cause });
  }
  return err;
}

/**
 * ohmonbento.com — a French Japanese-cuisine / bento cooking blog
 * (WordPress). Unofficial (`official: false`, same reasoning as every
 * other scraped adapter): no published API, this reads ordinary pages and
 * the schema.org JSON-LD they embed. `robots.txt` allows everything except
 * `/wp-admin/`.
 *
 * The simplest of the scraped adapters: like marmiton.ts, `fetchDetail`/
 * `parse` delegate straight to {@link jsonLdRecipeAdapter} — a recipe page
 * carries a WP Recipe Maker `Recipe` inside a Yoast `@graph`, which
 * `findRecipeNode` already handles (recurses into the array). Only `list()`
 * is site-specific: WordPress search at `/?s={query}&paged={page}` — the
 * **same URL whether `query` is empty (whole catalogue) or not** (no
 * branching, unlike 750g.ts) — with a `<div class="entry-thumb">` card
 * scrape (see {@link extractRecipeCards}). A page past the last one 404s,
 * the same clean end-of-list signal as marmiton.ts.
 */
export const ohMonBentoAdapter: RecipeSourceAdapter<{ html: string; url: string }> = {
  key: SOURCE_KEY,
  name: "Oh mon Bento",
  official: false,
  iconUrl: `${SITE_ORIGIN}/favicon.ico`,
  // Le contenu d'ohmonbento.com (noms, ingrédients, instructions) est en
  // français — détermine contre quel modèle/locale d'étiquettes
  // d'ingrédients translateRecipe (recipe-translation.ts) résout les
  // recettes de cette source lors d'une prévisualisation/d'un import.
  locale: "fr",

  async list(params: RecipeSourceListParams): Promise<RecipeSourceListResult> {
    try {
      // Curseur opaque = numéro de page suivant ; WordPress pagine via
      // `&paged=N` (page 1 implicite quand le paramètre est absent). Le
      // paramètre `?s=` est toujours présent, même vide — c'est ce qui
      // liste tout le catalogue (vérifié sur le ticket).
      const page = params.cursor ? Number(params.cursor) : 1;
      const query = params.query ?? "";
      const listUrl = `${SITE_ORIGIN}/?s=${encodeURIComponent(query)}${
        page > 1 ? `&paged=${page}` : ""
      }`;

      let response: Response;
      try {
        response = await fetch(listUrl);
      } catch (cause) {
        throw new RecipeSourceFetchError(
          SOURCE_KEY,
          `Network error listing Oh mon Bento recipes (${listUrl})`,
          { cause },
        );
      }
      // Une page au-delà de la dernière renvoie une vraie 404 — pas un
      // échec, juste « il n'y a plus rien » (même signal que marmiton.ts).
      if (response.status === 404) {
        return { items: [], nextCursor: null };
      }
      if (!response.ok) {
        throw new RecipeSourceFetchError(
          SOURCE_KEY,
          `Oh mon Bento responded ${response.status} (${listUrl})`,
        );
      }
      const html = await response.text();

      const items: RecipeSourceListItem[] = extractRecipeCards(html).map((card) => ({
        externalId: card.url,
        title: card.title,
        picture: card.image,
        url: card.url,
      }));

      // La 404 ci-dessus est le vrai signal de fin ; on ne propose une page
      // suivante que si celle-ci a renvoyé au moins une carte (même logique
      // que marmiton.ts).
      const nextCursor = items.length > 0 ? String(page + 1) : null;

      return { items, nextCursor };
    } catch (err) {
      // Rethrown as-is (already keyed "ohMonBento" by whichever branch
      // above threw it) — same reasoning as `marmiton.ts`/`quitoque.ts`.
      throw err;
    }
  },

  // `externalId` est directement l'URL canonique de la recette sur
  // ohmonbento.com (renvoyée telle quelle par `list()` ci-dessus) — même
  // convention que `jsonLdRecipeAdapter.fetchDetail`, à qui cette méthode
  // délègue entièrement.
  async fetchDetail(externalId: string): Promise<{ html: string; url: string }> {
    try {
      return await jsonLdRecipeAdapter.fetchDetail(externalId);
    } catch (err) {
      // `rekeySourceError` est le traitement utile de l'erreur à ce point
      // d'appel (relabelliser sa `sourceKey`), pas un simple re-throw.
      throw rekeySourceError(err);
    }
  },

  parse(raw: { html: string; url: string }): ParsedRecipe {
    try {
      return jsonLdRecipeAdapter.parse(raw);
    } catch (err) {
      throw rekeySourceError(err);
    }
  },
};