const OLLAMA_API_URL = process.env.OLLAMA_API_URL;
const OLLAMA_API_KEY = process.env.OLLAMA_API_KEY;
export const OLLAMA_MODEL = process.env.OLLAMA_MODEL || "gemma3:latest";

function cleanText(str) {
  return str
    .replace(/^#+\s*/gm, "")
    .replace(/\*\*(.*?)\*\*/g, "$1")
    .replace(/[*_`]/g, "")
    .replace(/\s+/g, " ")
    .trim();
}

function inferApiType(url) {
  if (!url) return "ollama-generate";
  if (url.includes("/api/chat/completions")) return "open-webui";
  if (url.includes("/api/chat")) return "ollama-chat";
  return "ollama-generate";
}

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

async function callOllamaBase(prompt, model, retries, stepName, apiType) {
  const isUsingOpenWebUI = apiType === "open-webui";
  const isUsingOllamaChat = apiType === "ollama-chat";

  for (let attempt = 1; attempt <= retries; attempt++) {
    try {
      const promptCharCount = prompt.length;
      const promptWordCount = prompt.split(/\s+/).length;

      console.log(
        `\n[${stepName}] Sending prompt (attempt ${attempt}/${retries})`,
      );
      console.log(
        `Prompt: ${promptCharCount} chars, ~${promptWordCount} words`,
      );

      const headers = { "Content-Type": "application/json" };
      if (isUsingOpenWebUI && OLLAMA_API_KEY) {
        headers["Authorization"] = `Bearer ${OLLAMA_API_KEY}`;
      }

      const body = isUsingOpenWebUI || isUsingOllamaChat
        ? { model, messages: [{ role: "user", content: prompt }] }
        : { model, prompt, stream: false };

      // Debug logging for Open WebUI
      if (isUsingOpenWebUI) {
        console.log(`[${stepName}] Using Open WebUI API`);
        console.log(`[${stepName}] Model name: "${model}"`);
        console.log(`[${stepName}] API URL: ${OLLAMA_API_URL}`);
      }

      const response = await fetch(OLLAMA_API_URL, {
        method: "POST",
        headers,
        body: JSON.stringify(body),
      });

      if (!response.ok) {
        let errorDetails = "";
        try {
          const errorData = await response.text();
          errorDetails = errorData ? `: ${errorData}` : "";
        } catch {
          // Ignore errors reading error response
        }
        const errorMsg = `Ollama request failed: ${response.status} ${response.statusText}${errorDetails}`;
        if (isUsingOpenWebUI) {
          console.error(`[${stepName}] Request details:`);
          console.error(`  URL: ${OLLAMA_API_URL}`);
          console.error(`  Model: "${model}"`);
          console.error(`  Body: ${JSON.stringify(body, null, 2)}`);
        }
        throw new Error(errorMsg);
      }

      const data = await response.json();
      const rawText = isUsingOpenWebUI
        ? data.choices?.[0]?.message?.content
        : isUsingOllamaChat
          ? data.message?.content
          : data.response;

      if (!rawText) throw new Error("No response from Ollama");

      const cleaned = cleanText(rawText);
      console.log(
        `[${stepName}] Received: ${rawText.length} chars, ~${rawText.split(/\s+/).length} words`,
      );

      return cleaned;
    } catch (err) {
      console.warn(`[${stepName}] Attempt ${attempt} failed: ${err.message}`);
      if (attempt === retries) throw err;
      const delay = 1000 * Math.pow(2, attempt) + Math.random() * 500;
      console.log(`Retrying in ${Math.round(delay / 1000)}s...`);
      await sleep(delay);
    }
  }
}

export async function callOllama(
  prompt,
  model = OLLAMA_MODEL,
  retries = 5,
  stepName = "unknown",
) {
  const apiType = inferApiType(OLLAMA_API_URL);
  return callOllamaBase(prompt, model, retries, stepName, apiType);
}

export async function callOllamaExplicit(
  prompt,
  model = OLLAMA_MODEL,
  retries = 5,
  stepName = "unknown",
  apiType = "ollama-generate",
) {
  return callOllamaBase(prompt, model, retries, stepName, apiType);
}

// Helper function to list available models from Open WebUI
export async function listOpenWebUIModels() {
  if (!OLLAMA_API_URL || !OLLAMA_API_URL.includes("/api/chat/completions")) {
    console.log("Not using Open WebUI API, skipping model list");
    return null;
  }

  try {
    const headers = { "Content-Type": "application/json" };
    if (OLLAMA_API_KEY) {
      headers["Authorization"] = `Bearer ${OLLAMA_API_KEY}`;
    }

    // Try to get models from Open WebUI's models endpoint
    // Open WebUI might have a /api/v1/models endpoint
    const baseUrl = OLLAMA_API_URL.replace("/api/chat/completions", "");
    const modelsUrl = `${baseUrl}/api/v1/models`;

    const response = await fetch(modelsUrl, {
      method: "GET",
      headers,
    });

    if (response.ok) {
      const data = await response.json();
      console.log("Available models from Open WebUI:", JSON.stringify(data, null, 2));
      return data;
    } else {
      console.log(`Could not list models: ${response.status} ${response.statusText}`);
      return null;
    }
  } catch (err) {
    console.log(`Error listing models: ${err.message}`);
    return null;
  }
}