const OLLAMA_API_URL = process.env.OLLAMA_API_URL;
const OLLAMA_API_KEY = process.env.OLLAMA_API_KEY;

async function sleep(ms) {
  return new Promise(resolve => setTimeout(resolve, ms));
}

async function callOllama(prompt, model = "gemma3n:e4b", retries = 6, stepName = "unknown") {
  for (let attempt = 1; attempt <= retries; attempt++) {
    try {
      console.log(`\n📤 [${stepName}] Sending prompt (attempt ${attempt}/${retries})...`);
      console.log(`   Prompt length: ${prompt.length} chars, ~${prompt.split(/\s+/).length} words`);

      const response = await fetch(OLLAMA_API_URL, {
        method: "POST",
        headers: {
          "Authorization": `Bearer ${OLLAMA_API_KEY}`,
          "Content-Type": "application/json",
        },
        body: JSON.stringify({
          model,
          messages: [{ role: "user", content: prompt }],
        }),
      });

      if (!response.ok) {
        throw new Error(`Ollama API request failed: ${response.status} ${response.statusText}`);
      }

      const data = await response.json();
      const text = data.choices?.[0]?.message?.content;
      if (!text) throw new Error("No response from Ollama");

      console.log(`✅ [${stepName}] Success — received ${text.length} chars`);
      return text.trim();

    } catch (err) {
      console.warn(`⚠️ [${stepName}] Failed (attempt ${attempt}/${retries}): ${err.message}`);
      if (attempt === retries) throw err;
      const delay = Math.pow(2, attempt) * 1000 + Math.random() * 1000;
      console.log(`   Retrying in ${Math.round(delay / 1000)}s...`);
      await sleep(delay);
    }
  }
}

function parseList(raw) {
  return raw
    .split("\n")
    .map(line => line.replace(/^\d+[\).\s-]*/, "").trim())
    .filter(line => line.length > 0);
}

function parseObjects(raw, type = "rooms") {
  return raw
    .split("\n")
    .map(line => line.replace(/^\d+[\).\s-]*/, "").trim())
    .filter(line => line.length > 0)
    .map(entry => {
      if (type === "rooms") {
        const [name, ...descParts] = entry.split(/[-–—:]/);
        return { name: name.trim(), description: descParts.join(" ").trim() };
      }
      if (type === "encounters") {
        const [name, ...detailParts] = entry.split(/[-–—:]/);
        return { name: name.trim(), details: detailParts.join(" ").trim() };
      }
      if (type === "npcs") {
        const [name, ...traitParts] = entry.split(/[-–—:]/);
        return { name: name.trim(), trait: traitParts.join(" ").trim() };
      }
      return entry;
    });
}

export async function generateDungeon() {
  console.log("🏗️ Starting staged dungeon generation...\n");

  // Step 1: Generate 10 titles
  const titlesRaw = await callOllama(
    "Generate 10 unique creative dungeon titles. Output as a numbered list only.",
    "gemma3n:e4b",
    6,
    "Step 1: Titles (10)"
  );
  const titles10 = parseList(titlesRaw);

  // Step 2: Pick top 3, add 2 new
  const titles3plusRaw = await callOllama(
    `Here are 10 dungeon titles:\n${titles10.join("\n")}\n\nSelect the 3 strongest titles and add 2 new original ones. Output 5 titles as a numbered list.`,
    "gemma3n:e4b",
    6,
    "Step 2: Narrow (5)"
  );
  const titles5 = parseList(titles3plusRaw);

  // Step 3: Pick single best
  const bestTitleRaw = await callOllama(
    `Here are 5 dungeon titles:\n${titles5.join("\n")}\n\nPick the single strongest title. Output only the title.`,
    "gemma3n:e4b",
    6,
    "Step 3: Final Title"
  );
  const title = bestTitleRaw.split("\n")[0].trim();

  // Step 4: Flavor text
  const flavor = await callOllama(
    `Write one evocative paragraph of flavor text for a dungeon titled "${title}". Do not include hooks, NPCs, or treasure.`,
    "gemma3n:e4b",
    6,
    "Step 4: Flavor"
  );

  // Step 5: Hooks & rumors
  const hooksRumorsRaw = await callOllama(
    `Based only on this dungeon flavor:\n${flavor}\n\nGenerate 3 adventure hooks and 3 rumors. Output as two numbered lists: first "Hooks", then "Rumors".`,
    "gemma3n:e4b",
    6,
    "Step 5: Hooks & Rumors"
  );
  const [hooksSection, rumorsSection] = hooksRumorsRaw.split(/Rumors[:\n]/i);
  const hooks = parseList(hooksSection.replace(/Hooks[:\n]*/i, ""));
  const rumors = parseList(rumorsSection || "");

  // Step 6: Rooms & encounters
  const roomsEncountersRaw = await callOllama(
    `Based on this flavor:\n${flavor}\n\nAnd these hooks and rumors:\n${hooks.join("\n")}\n${rumors.join("\n")}\n\nGenerate:\n- 5 rooms with names and short descriptions\n- 3 encounters with names and details.\nOutput as two numbered lists labeled "Rooms" and "Encounters".`,
    "gemma3n:e4b",
    6,
    "Step 6: Rooms & Encounters"
  );
  const [roomsSection, encountersSection] = roomsEncountersRaw.split(/Encounters[:\n]/i);
  const rooms = parseObjects(roomsSection.replace(/Rooms[:\n]*/i, ""), "rooms");
  const encounters = parseObjects(encountersSection || "", "encounters");

  // Step 7: Treasure & NPCs
  const treasureNpcsRaw = await callOllama(
    `Based only on these rooms and encounters:\n${JSON.stringify({ rooms, encounters }, null, 2)}\n\nGenerate:\n- 3 treasures (list)\n- 3 NPCs (name + trait).\nOutput as two numbered lists labeled "Treasure" and "NPCs".`,
    "gemma3n:e4b",
    6,
    "Step 7: Treasure & NPCs"
  );
  const [treasureSection, npcsSection] = treasureNpcsRaw.split(/NPCs[:\n]/i);
  const treasure = parseList(treasureSection.replace(/Treasure[:\n]*/i, ""));
  const npcs = parseObjects(npcsSection || "", "npcs");

  // Step 8: Assemble JSON in code
  const dungeon = {
    title,
    flavor: flavor.trim(),
    map: "map.png",
    hooks,
    rumors,
    rooms,
    encounters,
    treasure,
    npcs
  };

  console.log("\n🎉 Dungeon generation complete!");
  return dungeon;
}