const apiBaseUrlInput = document.getElementById("apiBaseUrl");
const apiKeyHeaderInput = document.getElementById("apiKeyHeader");
const apiKeyPrefixInput = document.getElementById("apiKeyPrefix");
const modelInput = document.getElementById("model");
const systemPromptInput = document.getElementById("systemPrompt");
const resumeInput = document.getElementById("resume");
const saveBtn = document.getElementById("saveBtn");
const addApiKeyBtn = document.getElementById("addApiKeyBtn");
const apiKeysContainer = document.getElementById("apiKeys");
const activeApiKeySelect = document.getElementById("activeApiKeySelect");
const addTaskBtn = document.getElementById("addTaskBtn");
const tasksContainer = document.getElementById("tasks");
const statusEl = document.getElementById("status");
const themeSelect = document.getElementById("themeSelect");
const resetApiBtn = document.getElementById("resetApiBtn");

const OPENAI_DEFAULTS = {
  apiBaseUrl: "https://api.openai.com/v1",
  apiKeyHeader: "Authorization",
  apiKeyPrefix: "Bearer "
};

function getStorage(keys) {
  return new Promise((resolve) => chrome.storage.local.get(keys, resolve));
}

function setStatus(message) {
  statusEl.textContent = message;
  if (!message) return;
  setTimeout(() => {
    if (statusEl.textContent === message) statusEl.textContent = "";
  }, 2000);
}

function applyTheme(theme) {
  const value = theme || "system";
  document.documentElement.dataset.theme = value;
}

function newTaskId() {
  if (crypto?.randomUUID) return crypto.randomUUID();
  return `task-${Date.now()}-${Math.random().toString(16).slice(2, 8)}`;
}

function newApiKeyId() {
  if (crypto?.randomUUID) return crypto.randomUUID();
  return `key-${Date.now()}-${Math.random().toString(16).slice(2, 8)}`;
}

function buildApiKeyCard(entry) {
  const card = document.createElement("div");
  card.className = "api-key-card";
  card.dataset.id = entry.id || newApiKeyId();

  const nameField = document.createElement("div");
  nameField.className = "field";
  const nameLabel = document.createElement("label");
  nameLabel.textContent = "Name";
  const nameInput = document.createElement("input");
  nameInput.type = "text";
  nameInput.value = entry.name || "";
  nameInput.className = "api-key-name";
  nameField.appendChild(nameLabel);
  nameField.appendChild(nameInput);

  const keyField = document.createElement("div");
  keyField.className = "field";
  const keyLabel = document.createElement("label");
  keyLabel.textContent = "Key";
  const keyInline = document.createElement("div");
  keyInline.className = "inline";
  const keyInput = document.createElement("input");
  keyInput.type = "password";
  keyInput.autocomplete = "off";
  keyInput.placeholder = "sk-...";
  keyInput.value = entry.key || "";
  keyInput.className = "api-key-value";
  const showBtn = document.createElement("button");
  showBtn.type = "button";
  showBtn.className = "ghost";
  showBtn.textContent = "Show";
  showBtn.addEventListener("click", () => {
    const isPassword = keyInput.type === "password";
    keyInput.type = isPassword ? "text" : "password";
    showBtn.textContent = isPassword ? "Hide" : "Show";
  });
  keyInline.appendChild(keyInput);
  keyInline.appendChild(showBtn);
  keyField.appendChild(keyLabel);
  keyField.appendChild(keyInline);

  const actions = document.createElement("div");
  actions.className = "api-key-actions";
  const deleteBtn = document.createElement("button");
  deleteBtn.type = "button";
  deleteBtn.className = "ghost delete";
  deleteBtn.textContent = "Delete";
  deleteBtn.addEventListener("click", () => {
    card.remove();
    updateApiKeySelect();
  });
  actions.appendChild(deleteBtn);

  const updateSelect = () => updateApiKeySelect(activeApiKeySelect.value);
  nameInput.addEventListener("input", updateSelect);
  keyInput.addEventListener("input", updateSelect);

  card.appendChild(nameField);
  card.appendChild(keyField);
  card.appendChild(actions);

  return card;
}

function collectApiKeys() {
  const cards = [...apiKeysContainer.querySelectorAll(".api-key-card")];
  return cards.map((card) => {
    const nameInput = card.querySelector(".api-key-name");
    const keyInput = card.querySelector(".api-key-value");
    return {
      id: card.dataset.id || newApiKeyId(),
      name: (nameInput?.value || "Default").trim(),
      key: (keyInput?.value || "").trim()
    };
  });
}

function updateApiKeySelect(preferredId) {
  const keys = collectApiKeys();
  activeApiKeySelect.innerHTML = "";

  if (!keys.length) {
    const option = document.createElement("option");
    option.value = "";
    option.textContent = "No keys configured";
    activeApiKeySelect.appendChild(option);
    activeApiKeySelect.disabled = true;
    return;
  }

  activeApiKeySelect.disabled = false;
  const selectedId =
    preferredId && keys.some((key) => key.id === preferredId)
      ? preferredId
      : keys[0].id;

  for (const key of keys) {
    const option = document.createElement("option");
    option.value = key.id;
    option.textContent = key.name || "Default";
    activeApiKeySelect.appendChild(option);
  }

  activeApiKeySelect.value = selectedId;
}

function buildTaskCard(task) {
  const card = document.createElement("div");
  card.className = "task-card";
  card.dataset.id = task.id || newTaskId();

  const nameField = document.createElement("div");
  nameField.className = "field";
  const nameLabel = document.createElement("label");
  nameLabel.textContent = "Name";
  const nameInput = document.createElement("input");
  nameInput.type = "text";
  nameInput.value = task.name || "";
  nameInput.className = "task-name";
  nameField.appendChild(nameLabel);
  nameField.appendChild(nameInput);

  const textField = document.createElement("div");
  textField.className = "field";
  const textLabel = document.createElement("label");
  textLabel.textContent = "Task prompt";
  const textArea = document.createElement("textarea");
  textArea.rows = 6;
  textArea.value = task.text || "";
  textArea.className = "task-text";
  textField.appendChild(textLabel);
  textField.appendChild(textArea);

  const actions = document.createElement("div");
  actions.className = "task-actions";
  const moveTopBtn = document.createElement("button");
  moveTopBtn.type = "button";
  moveTopBtn.className = "ghost move-top";
  moveTopBtn.textContent = "Top";
  moveTopBtn.setAttribute("aria-label", "Move task to top");
  moveTopBtn.setAttribute("title", "Move to top");
  const moveUpBtn = document.createElement("button");
  moveUpBtn.type = "button";
  moveUpBtn.className = "ghost move-up";
  moveUpBtn.textContent = "Up";
  moveUpBtn.setAttribute("aria-label", "Move task up");
  moveUpBtn.setAttribute("title", "Move up");
  const moveDownBtn = document.createElement("button");
  moveDownBtn.type = "button";
  moveDownBtn.className = "ghost move-down";
  moveDownBtn.textContent = "Down";
  moveDownBtn.setAttribute("aria-label", "Move task down");
  moveDownBtn.setAttribute("title", "Move down");
  const addBelowBtn = document.createElement("button");
  addBelowBtn.type = "button";
  addBelowBtn.className = "ghost add-below";
  addBelowBtn.textContent = "Add";
  addBelowBtn.setAttribute("aria-label", "Add task below");
  addBelowBtn.setAttribute("title", "Add below");
  const duplicateBtn = document.createElement("button");
  duplicateBtn.type = "button";
  duplicateBtn.className = "ghost duplicate";
  duplicateBtn.textContent = "Duplicate";
  duplicateBtn.setAttribute("aria-label", "Duplicate task");
  duplicateBtn.setAttribute("title", "Duplicate");
  const deleteBtn = document.createElement("button");
  deleteBtn.type = "button";
  deleteBtn.className = "ghost delete";
  deleteBtn.textContent = "Delete";
  deleteBtn.setAttribute("aria-label", "Delete task");
  deleteBtn.setAttribute("title", "Delete");

  moveTopBtn.addEventListener("click", () => {
    const first = tasksContainer.firstElementChild;
    if (!first || first === card) return;
    tasksContainer.insertBefore(card, first);
    updateTaskControls();
  });

  moveUpBtn.addEventListener("click", () => {
    const previous = card.previousElementSibling;
    if (!previous) return;
    tasksContainer.insertBefore(card, previous);
    updateTaskControls();
  });

  moveDownBtn.addEventListener("click", () => {
    const next = card.nextElementSibling;
    if (!next) return;
    tasksContainer.insertBefore(card, next.nextElementSibling);
    updateTaskControls();
  });

  addBelowBtn.addEventListener("click", () => {
    const newCard = buildTaskCard({ id: newTaskId(), name: "", text: "" });
    card.insertAdjacentElement("afterend", newCard);
    updateTaskControls();
  });

  duplicateBtn.addEventListener("click", () => {
    const copy = {
      id: newTaskId(),
      name: `${nameInput.value || "Untitled"} Copy`,
      text: textArea.value
    };
    const newCard = buildTaskCard(copy);
    card.insertAdjacentElement("afterend", newCard);
    updateTaskControls();
  });

  deleteBtn.addEventListener("click", () => {
    card.remove();
    updateTaskControls();
  });

  actions.appendChild(moveTopBtn);
  actions.appendChild(moveUpBtn);
  actions.appendChild(moveDownBtn);
  actions.appendChild(addBelowBtn);
  actions.appendChild(duplicateBtn);
  actions.appendChild(deleteBtn);

  card.appendChild(nameField);
  card.appendChild(textField);
  card.appendChild(actions);

  return card;
}

function updateTaskControls() {
  const cards = [...tasksContainer.querySelectorAll(".task-card")];
  cards.forEach((card, index) => {
    const moveTopBtn = card.querySelector(".move-top");
    const moveUpBtn = card.querySelector(".move-up");
    const moveDownBtn = card.querySelector(".move-down");
    if (moveTopBtn) moveTopBtn.disabled = index === 0;
    if (moveUpBtn) moveUpBtn.disabled = index === 0;
    if (moveDownBtn) moveDownBtn.disabled = index === cards.length - 1;
  });
}

function collectTasks() {
  const cards = [...tasksContainer.querySelectorAll(".task-card")];
  return cards.map((card) => {
    const nameInput = card.querySelector(".task-name");
    const textArea = card.querySelector(".task-text");
    return {
      id: card.dataset.id || newTaskId(),
      name: (nameInput?.value || "Untitled Task").trim(),
      text: (textArea?.value || "").trim()
    };
  });
}

async function loadSettings() {
  const {
    apiKey = "",
    apiKeys = [],
    activeApiKeyId = "",
    apiBaseUrl = "",
    apiKeyHeader = "",
    apiKeyPrefix = "",
    model = "",
    systemPrompt = "",
    resume = "",
    tasks = [],
    theme = "system"
  } = await getStorage([
    "apiKey",
    "apiKeys",
    "activeApiKeyId",
    "apiBaseUrl",
    "apiKeyHeader",
    "apiKeyPrefix",
    "model",
    "systemPrompt",
    "resume",
    "tasks",
    "theme"
  ]);

  apiBaseUrlInput.value = apiBaseUrl;
  apiKeyHeaderInput.value = apiKeyHeader;
  apiKeyPrefixInput.value = apiKeyPrefix;
  modelInput.value = model;
  systemPromptInput.value = systemPrompt;
  resumeInput.value = resume;
  themeSelect.value = theme;
  applyTheme(theme);

  let resolvedKeys = Array.isArray(apiKeys) ? apiKeys : [];
  let resolvedActiveId = activeApiKeyId;

  if (!resolvedKeys.length && apiKey) {
    const migrated = { id: newApiKeyId(), name: "Default", key: apiKey };
    resolvedKeys = [migrated];
    resolvedActiveId = migrated.id;
    await chrome.storage.local.set({
      apiKeys: resolvedKeys,
      activeApiKeyId: resolvedActiveId
    });
  }

  apiKeysContainer.innerHTML = "";
  if (!resolvedKeys.length) {
    apiKeysContainer.appendChild(buildApiKeyCard({ id: newApiKeyId(), name: "", key: "" }));
  } else {
    for (const entry of resolvedKeys) {
      apiKeysContainer.appendChild(buildApiKeyCard(entry));
    }
  }
  updateApiKeySelect(resolvedActiveId);

  tasksContainer.innerHTML = "";
  if (!tasks.length) {
    tasksContainer.appendChild(
      buildTaskCard({ id: newTaskId(), name: "", text: "" })
    );
    updateTaskControls();
    return;
  }

  for (const task of tasks) {
    tasksContainer.appendChild(buildTaskCard(task));
  }
  updateTaskControls();
}

async function saveSettings() {
  const tasks = collectTasks();
  const apiKeys = collectApiKeys();
  const activeApiKeyId =
    apiKeys.find((entry) => entry.id === activeApiKeySelect.value)?.id ||
    apiKeys[0]?.id ||
    "";
  await chrome.storage.local.set({
    apiBaseUrl: apiBaseUrlInput.value.trim(),
    apiKeyHeader: apiKeyHeaderInput.value.trim(),
    apiKeyPrefix: apiKeyPrefixInput.value,
    apiKeys,
    activeApiKeyId,
    model: modelInput.value.trim(),
    systemPrompt: systemPromptInput.value,
    resume: resumeInput.value,
    tasks,
    theme: themeSelect.value
  });
  setStatus("Saved.");
}

saveBtn.addEventListener("click", () => void saveSettings());
addTaskBtn.addEventListener("click", () => {
  const newCard = buildTaskCard({ id: newTaskId(), name: "", text: "" });
  const first = tasksContainer.firstElementChild;
  if (first) {
    tasksContainer.insertBefore(newCard, first);
  } else {
    tasksContainer.appendChild(newCard);
  }
  updateTaskControls();
});

addApiKeyBtn.addEventListener("click", () => {
  const newCard = buildApiKeyCard({ id: newApiKeyId(), name: "", key: "" });
  const first = apiKeysContainer.firstElementChild;
  if (first) {
    apiKeysContainer.insertBefore(newCard, first);
  } else {
    apiKeysContainer.appendChild(newCard);
  }
  updateApiKeySelect(activeApiKeySelect.value);
});

activeApiKeySelect.addEventListener("change", () => {
  updateApiKeySelect(activeApiKeySelect.value);
});

themeSelect.addEventListener("change", () => applyTheme(themeSelect.value));
resetApiBtn.addEventListener("click", async () => {
  apiBaseUrlInput.value = OPENAI_DEFAULTS.apiBaseUrl;
  apiKeyHeaderInput.value = OPENAI_DEFAULTS.apiKeyHeader;
  apiKeyPrefixInput.value = OPENAI_DEFAULTS.apiKeyPrefix;
  await chrome.storage.local.set({
    apiBaseUrl: OPENAI_DEFAULTS.apiBaseUrl,
    apiKeyHeader: OPENAI_DEFAULTS.apiKeyHeader,
    apiKeyPrefix: OPENAI_DEFAULTS.apiKeyPrefix
  });
  setStatus("OpenAI defaults restored.");
});

loadSettings();