import { serve } from "https://deno.land/std@0.140.0/http/server.ts";

const baseHeaders = {
  "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64)",
  "Accept": "application/json",
};

// Функция для расчёта рейтинга из rates_scores_stats
function calculateWeightedScore(stats) {
  if (!stats?.length) return null;

  let total = 0;
  let count = 0;

  for (const item of stats) {
    const score = parseInt(item.name);
    const votes = item.value;
    total += score * votes;
    count += votes;
  }

  return count ? (total / count).toFixed(2) : null;
}

// Получаем данные Shikimori
async function getShikimoriData(search, year) {
  if (!search) {
    return { weightedScore: "N/A", characters: [] };
  }

  const animeUrl = `https://shikimori.one/api/animes?search=${encodeURIComponent(search)}&limit=1${year ? `&year=${year}` : ""}`;

  try {
    const animeRes = await fetch(animeUrl, { headers: baseHeaders });
    const animeData = await animeRes.json();
    const anime = animeData?.[0];

    if (!anime || !anime.id) {
      return { weightedScore: "N/A", characters: [] };
    }

    // Получаем рейтинг из rates_scores_stats
    const statsUrl = `https://shikimori.one/api/animes/${anime.id}`;
    const statsRes = await fetch(statsUrl, { headers: baseHeaders });
    const statsData = await statsRes.json();
    const weightedScore = calculateWeightedScore(statsData.rates_scores_stats) || "N/A";

    // Получаем главных персонажей
    const rolesUrl = `https://shikimori.one/api/animes/${anime.id}/roles`;
    const rolesRes = await fetch(rolesUrl, { headers: baseHeaders });
    const roles = await rolesRes.json();

    const mainCharacters = roles
      .filter((c) => c.roles.includes("Main"))
      .slice(0, 5)
      .map((c) => ({
        name: c.character.russian,
        url: `https://shikimori.one${c.character.url}`,
      }));

    return {
      weightedScore,
      characters: mainCharacters,
    };
  } catch {
    return { weightedScore: "N/A", characters: [] };
  }
}

// Получаем рейтинг MyAnimeList через Jikan
async function getMALScore(title) {
  const url = `https://api.jikan.moe/v4/anime?q=${encodeURIComponent(title)}&limit=1`;

  try {
    const response = await fetch(url);
    const data = await response.json();
    const anime = data?.data?.[0];

    if (!anime || !anime.score) {
      return "N/A";
    }

    return `${anime.score}★`;
  } catch {
    return "N/A";
  }
}

// Основная функция получения релиза и формирования примечания
async function getReleaseFromAnixart(releaseId, token = "") {
  const url = `https://api.anixart.tv/release/${releaseId}${token ? `?token=${token}` : ""}`;

  try {
    const response = await fetch(url, { headers: baseHeaders });
    const data = await response.json();
    const release = data?.release;

    if (!release) {
      return { code: 2, release: null };
    }

    const title = release.title_original || release.title_ru || "";
    const year = release.year || "";

    try {
      const shikiData = await getShikimoriData(title, year);
      const shikiScore = shikiData.weightedScore !== "N/A" ? `<b>Рейтинг Shikimori:</b> ${shikiData.weightedScore}★` : "";
      const malScoreRaw = await getMALScore(title);
      const malScore = malScoreRaw !== "N/A" ? `<b>Рейтинг MyAnimeList:</b> ${malScoreRaw}` : "";
      const characters = shikiData.characters.length
        ? `<b>Главные персонажи:</b> ` + shikiData.characters.map(c => `<a href="${c.url}">${c.name}</a>`).join(", ")
        : "";

      // Собираем рейтинг и персонажей, фильтруя пустые строки
      const ratingParts = [shikiScore, malScore].filter(Boolean).join("<br>");
      const charsPart = characters ? characters : "";

      // Примечание от Anixart (без лишних br если пустое)
      const originalNote = release.note?.trim();

      let finalNote = "";
      if (ratingParts) finalNote += ratingParts;
      if (charsPart) finalNote += (finalNote ? "<br>" : "") + charsPart;
      if (originalNote) finalNote += (finalNote ? "<br><br>" : "") + `<b>Примечание от Anixart:</b><br>${originalNote}`;

      release.note = finalNote || null;

    } catch {
      release.note = null;
    }

    return { code: 0, release };
  } catch {
    return { code: 2, release: null };
  }
}

// HTTP сервер
serve(async (req) => {
  const url = new URL(req.url);
  const path = url.pathname;
  const token = url.searchParams.get("token");

  const releaseMatch = path.match(/^\/api\/release\/([^\/]+)/);
  if (releaseMatch) {
    const releaseId = releaseMatch[1];
    const result = await getReleaseFromAnixart(releaseId, token);
    return new Response(JSON.stringify(result), {
      headers: {
        "Content-Type": "application/json",
        "Access-Control-Allow-Origin": "*",
      },
    });
  }

  return new Response("Invalid endpoint", { status: 404 });
});