/**
 * suggest.js — Подсказки промптов из истории и генерация через Codex
 */

import { apiFetch } from "./api.js";
import { getState, setSuggestRunning } from "./state.js";

function applyPrompt(promptText) {
  const promptInput = document.querySelector("#prompt");
  const promptCounter = document.querySelector("#prompt-counter");
  const editButton = document.querySelector("#edit-button");

  if (!promptInput) return;

  promptInput.value = promptText;
  if (promptCounter) {
    promptCounter.textContent = `${promptText.length} / 1000`;
  }

  const state = getState();
  if (editButton) {
    editButton.disabled = !state.currentVersionId || !promptText.trim() || state.isBusy;
  }
}

export function renderSuggestChips(container, items) {
  if (!container) return;
  container.innerHTML = "";

  for (const item of items) {
    const text = String(item || "").trim();
    if (!text) continue;

    const chip = document.createElement("button");
    chip.type = "button";
    chip.className = "suggest-chip";
    chip.textContent = text;
    chip.addEventListener("click", () => applyPrompt(text));
    container.appendChild(chip);
  }
}

export async function loadSuggestHistoryChips() {
  const container = document.querySelector("#suggest-history-chips");
  if (!container) return;

  try {
    const res = await apiFetch("/api/suggest-prompts");
    const prompts = Array.isArray(res?.prompts) ? res.prompts : [];
    if (prompts.length === 0) {
      container.innerHTML = '<span class="suggest-empty">В истории пока нет промптов</span>';
      return;
    }
    renderSuggestChips(container, prompts);
  } catch {
    container.innerHTML = '<span class="suggest-empty">Не удалось загрузить подсказки</span>';
  }
}

export function updateSuggestCodexButton() {
  const suggestBtn = document.querySelector("#suggest-button");
  const codexBtn = document.querySelector("#suggest-codex-button");
  const state = getState();

  const canSuggest = Boolean(state.currentVersionId) && !state.isBusy;
  if (suggestBtn) {
    suggestBtn.disabled = !canSuggest;
  }
  if (codexBtn) {
    codexBtn.disabled = !canSuggest || state.suggestRunning;
  }
}

export async function runSuggest() {
  const state = getState();
  if (!state.currentVersionId || state.suggestRunning || state.isBusy) {
    return;
  }

  const statusEl = document.querySelector("#suggest-codex-status");
  const chipsContainer = document.querySelector("#suggest-codex-chips");
  const codexBtn = document.querySelector("#suggest-codex-button");

  setSuggestRunning(true);
  updateSuggestCodexButton();

  if (statusEl) statusEl.textContent = "Codex анализирует кадр…";
  if (chipsContainer) chipsContainer.innerHTML = "";

  try {
    const res = await apiFetch("/api/suggest", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ sourceId: state.currentVersionId }),
    });

    const jobId = res.jobId;
    await pollSuggestJob(jobId);
  } catch (err) {
    if (statusEl) statusEl.textContent = `Ошибка: ${err.message}`;
    setSuggestRunning(false);
    updateSuggestCodexButton();
  }
}

async function pollSuggestJob(jobId) {
  const statusEl = document.querySelector("#suggest-codex-status");
  const chipsContainer = document.querySelector("#suggest-codex-chips");

  let failures = 0;

  const poll = async () => {
    try {
      const data = await apiFetch(`/api/jobs/${jobId}/status`);
      failures = 0;

      if (data.status === "queued") {
        if (statusEl) {
          statusEl.textContent = data.queuePosition
            ? `В очереди (позиция ${data.queuePosition})…`
            : "В очереди…";
        }
        setTimeout(poll, 1500);
        return;
      }

      if (data.status === "running") {
        if (statusEl) statusEl.textContent = "Codex генерирует варианты…";
        setTimeout(poll, 1500);
        return;
      }

      if (data.status === "done") {
        if (statusEl) statusEl.textContent = "";
        const suggestions = data.result?.suggestions || [];
        if (suggestions.length > 0) {
          renderSuggestChips(chipsContainer, suggestions);
        } else {
          if (statusEl) statusEl.textContent = "Codex не вернул вариантов.";
        }
        setSuggestRunning(false);
        updateSuggestCodexButton();
        return;
      }

      if (data.status === "error" || data.status === "interrupted") {
        if (statusEl) statusEl.textContent = `Ошибка: ${data.error || "Не удалось получить подсказки."}`;
        setSuggestRunning(false);
        updateSuggestCodexButton();
        return;
      }

      setTimeout(poll, 1500);
    } catch (err) {
      failures++;
      if (failures >= 5) {
        if (statusEl) statusEl.textContent = `Ошибка связи с сервером: ${err.message}`;
        setSuggestRunning(false);
        updateSuggestCodexButton();
        return;
      }
      setTimeout(poll, 2000);
    }
  };

  poll();
}

export function initSuggest() {
  const suggestBtn = document.querySelector("#suggest-button");
  const suggestPanel = document.querySelector("#suggest-panel");
  const codexBtn = document.querySelector("#suggest-codex-button");

  if (suggestBtn && suggestPanel) {
    suggestBtn.addEventListener("click", () => {
      const isHidden = suggestPanel.hidden;
      suggestPanel.hidden = !isHidden;
      if (isHidden) {
        loadSuggestHistoryChips();
      }
    });
  }

  if (codexBtn) {
    codexBtn.addEventListener("click", runSuggest);
  }
}