/** @type {{ current: string, status: string, statusColor: string, activeProfile: string, recording: boolean, timerText: string, handedness: string, taskSidebarOpen: boolean }} */
export const page = $state({
  current: "dictation",
  status: "Ready",
  statusColor: "#7ec89a",
  activeProfile: "None",
  recording: false,
  timerText: "00:00",
  handedness: "Right",
  taskSidebarOpen: false,
});

// ---- Settings (persisted to localStorage) ----

const SETTINGS_KEY = "kon_settings";

const defaults = {
  engine: "whisper",
  modelSize: "Base",
  language: "en",
  device: "auto",
  formatMode: "Smart",
  removeFillers: true,
  antiHallucination: true,
  britishEnglish: true,
  autoCopy: true,
  includeTimestamps: true,
  theme: "Dark",
  fontSize: 14,
  llmModelSize: "small",
  llmEnabled: false,
  saveAudio: false,
  outputFolder: "",
  globalHotkey: "Ctrl+Shift+R",
  sidebarCollapsed: false,
  // Empty string = let backend auto-select. Otherwise, exact device name as
  // returned by `list_audio_devices`. Set via Settings → Audio → Microphone.
  microphoneDevice: "",
};

function loadSettings() {
  try {
    const raw = localStorage.getItem(SETTINGS_KEY);
    if (raw) return { ...defaults, ...JSON.parse(raw) };
  } catch {}
  return { ...defaults };
}

export const settings = $state(loadSettings());

/** Save current settings to localStorage */
export function saveSettings() {
  try {
    localStorage.setItem(SETTINGS_KEY, JSON.stringify(settings));
  } catch {}
}

// ---- Profiles (persisted to localStorage) ----

const PROFILES_KEY = "kon_profiles";

function loadProfiles() {
  try {
    const raw = localStorage.getItem(PROFILES_KEY);
    if (raw) return JSON.parse(raw);
  } catch {}
  return [];
}

export const profiles = $state(loadProfiles());

export function saveProfiles() {
  try {
    localStorage.setItem(PROFILES_KEY, JSON.stringify(profiles));
  } catch {}
}

// ---- History (dual-write: SQLite via Tauri = canonical, localStorage = read-cache) ----
//
// As of Day 4 of the upgrade plan, the canonical store is the SQLite
// transcripts table reachable via the `add_transcript`, `list_transcripts`,
// `update_transcript`, `delete_transcript`, `search_transcripts` Tauri
// commands. localStorage continues to back the in-memory `history` array
// for UI snappiness and offline browser-preview support, but the source
// of truth is SQLite. Browser preview falls back to localStorage only.

import { invoke } from "@tauri-apps/api/core";
import { hasTauriRuntime } from "$lib/utils/runtime.js";

const HISTORY_KEY = "kon_history";

function loadHistory() {
  try {
    const raw = localStorage.getItem(HISTORY_KEY);
    if (raw) return JSON.parse(raw);
  } catch {}
  return [];
}

export const history = $state(loadHistory());

export function saveHistory() {
  try {
    localStorage.setItem(HISTORY_KEY, JSON.stringify(history));
  } catch {}
}

/**
 * Add a transcript to history. Dual-writes to SQLite (canonical) and
 * localStorage (cache). The SQLite write is best-effort: if it fails,
 * we still update the in-memory + localStorage copy so the UI stays
 * responsive. The next session boot reconciles by reading SQLite first.
 *
 * `entry` shape:
 *   { id, text, source?, title?, audioPath?, duration?, engine?, modelId?,
 *     inferenceMs?, sampleRate?, audioChannels?, formatMode?,
 *     removeFillers?, britishEnglish?, antiHallucination?, ...uiOnlyFields }
 */
export async function addToHistory(entry) {
  history.unshift(entry);
  if (history.length > 100) history.length = 100;
  saveHistory();

  if (!hasTauriRuntime()) return; // Browser preview: localStorage only.

  try {
    await invoke("add_transcript", {
      transcript: {
        id: String(entry.id),
        text: entry.text ?? "",
        source: entry.source ?? "microphone",
        title: entry.title ?? null,
        audioPath: entry.audioPath ?? null,
        duration: Number(entry.duration ?? 0),
        engine: entry.engine ?? null,
        modelId: entry.modelId ?? null,
        inferenceMs: entry.inferenceMs ?? null,
        sampleRate: entry.sampleRate ?? null,
        audioChannels: entry.audioChannels ?? null,
        formatMode: entry.formatMode ?? null,
        removeFillers: !!entry.removeFillers,
        britishEnglish: !!entry.britishEnglish,
        antiHallucination: !!entry.antiHallucination,
      },
    });
  } catch (err) {
    console.warn("addToHistory: SQLite dual-write failed, kept in localStorage", err);
  }
}

/**
 * Update text and/or title of an existing transcript. Persists to SQLite
 * via update_transcript; updates the in-memory + localStorage cache.
 * Closes the historic "rename never persists" bug from
 * architecture-review.md §13.
 */
export async function renameHistoryEntry(id, updates) {
  const idx = history.findIndex(h => String(h.id) === String(id));
  if (idx >= 0) {
    if (updates.title !== undefined) history[idx].title = updates.title;
    if (updates.text !== undefined) history[idx].text = updates.text;
    saveHistory();
  }

  if (!hasTauriRuntime()) return;

  try {
    await invoke("update_transcript", {
      id: String(id),
      text: updates.text ?? null,
      title: updates.title ?? null,
    });
  } catch (err) {
    console.warn("renameHistoryEntry: SQLite update failed", err);
    throw err;
  }
}

export function deleteFromHistory(index) {
  const entry = history[index];
  history.splice(index, 1);
  saveHistory();

  if (!hasTauriRuntime() || !entry?.id) return;

  invoke("delete_transcript", { id: String(entry.id) })
    .catch(err => console.warn("deleteFromHistory: SQLite delete failed", err));
}

// ---- Tasks (persisted to localStorage) ----

const TASKS_KEY = "kon_tasks";

function loadTasks() {
  try {
    const raw = localStorage.getItem(TASKS_KEY);
    if (raw) return JSON.parse(raw);
  } catch {}
  return [];
}

export const tasks = $state(loadTasks());

export function saveTasks() {
  try {
    localStorage.setItem(TASKS_KEY, JSON.stringify(tasks));
  } catch {}
}

export function addTask(task) {
  tasks.unshift({
    id: crypto.randomUUID(),
    text: task.text,
    bucket: task.bucket || "inbox",
    listId: task.listId || null,
    context: task.context || "",
    effort: task.effort || "",
    done: false,
    doneAt: null,
    createdAt: new Date().toISOString(),
    sourceTranscriptId: task.sourceTranscriptId || null,
    notes: "",
  });
  saveTasks();
  broadcastTasks();
}

export function updateTask(id, updates) {
  const idx = tasks.findIndex((t) => t.id === id);
  if (idx >= 0) {
    Object.assign(tasks[idx], updates);
    saveTasks();
    broadcastTasks();
  }
}

export function deleteTask(id) {
  const idx = tasks.findIndex((t) => t.id === id);
  if (idx >= 0) {
    tasks.splice(idx, 1);
    saveTasks();
    broadcastTasks();
  }
}

export function completeTask(id) {
  updateTask(id, { done: true, doneAt: new Date().toISOString() });
}

export function uncompleteTask(id) {
  updateTask(id, { done: false, doneAt: null });
}

// ---- BroadcastChannel for multi-window task sync ----

const taskChannel = typeof BroadcastChannel !== "undefined"
  ? new BroadcastChannel("kon_tasks")
  : null;

if (taskChannel) {
  taskChannel.onmessage = (event) => {
    if (event.data.type === "tasks_updated") {
      tasks.length = 0;
      tasks.push(...event.data.tasks);
    }
  };
}

function broadcastTasks() {
  if (taskChannel) {
    taskChannel.postMessage({ type: "tasks_updated", tasks: $state.snapshot(tasks) });
  }
}

// ---- Task Lists (persisted to localStorage) ----

const TASK_LISTS_KEY = "kon_task_lists";

function loadTaskLists() {
  try {
    const raw = localStorage.getItem(TASK_LISTS_KEY);
    if (raw) return JSON.parse(raw);
  } catch {}
  return [
    { id: "all", name: "All Tasks", builtIn: true, createdAt: null },
    { id: "inbox", name: "Inbox", builtIn: true, createdAt: null },
  ];
}

export const taskLists = $state(loadTaskLists());

export function saveTaskLists() {
  try {
    localStorage.setItem(TASK_LISTS_KEY, JSON.stringify(taskLists));
  } catch {}
  broadcastTaskLists();
}

export function addTaskList(name, profileId = null) {
  taskLists.push({
    id: crypto.randomUUID(),
    name,
    builtIn: false,
    profileId,
    createdAt: new Date().toISOString(),
  });
  saveTaskLists();
}

export function addProfileTaskList(profileName) {
  const exists = taskLists.find((l) => l.profileId === profileName);
  if (exists) return exists.id;
  const id = crypto.randomUUID();
  taskLists.push({
    id,
    name: profileName,
    builtIn: false,
    profileId: profileName,
    createdAt: new Date().toISOString(),
  });
  saveTaskLists();
  return id;
}

export function removeProfileTaskList(profileName) {
  const idx = taskLists.findIndex((l) => l.profileId === profileName);
  if (idx >= 0) {
    const listId = taskLists[idx].id;
    for (const t of tasks) {
      if (t.listId === listId) t.listId = null;
    }
    saveTasks();
    broadcastTasks();
    taskLists.splice(idx, 1);
    saveTaskLists();
  }
}

export function moveTaskToList(taskId, listId) {
  updateTask(taskId, { listId: listId === "inbox" || listId === "all" ? null : listId });
}

export function moveTaskListToProfile(listId, profileId) {
  const list = taskLists.find((l) => l.id === listId);
  if (list && !list.builtIn) {
    list.profileId = profileId || null;
    if (profileId && !list.name) list.name = profileId;
    saveTaskLists();
  }
}

export function renameTaskList(id, name) {
  const list = taskLists.find((l) => l.id === id);
  if (list && !list.builtIn) {
    list.name = name;
    saveTaskLists();
  }
}

export function deleteTaskList(id) {
  const idx = taskLists.findIndex((l) => l.id === id);
  if (idx >= 0 && !taskLists[idx].builtIn) {
    for (const t of tasks) {
      if (t.listId === id) t.listId = null;
    }
    saveTasks();
    broadcastTasks();
    taskLists.splice(idx, 1);
    saveTaskLists();
  }
}

export function moveTaskList(id, direction) {
  const idx = taskLists.findIndex((l) => l.id === id);
  const targetIdx = idx + direction;
  if (targetIdx < 0 || targetIdx >= taskLists.length) return;
  if (taskLists[targetIdx].builtIn) return;
  [taskLists[idx], taskLists[targetIdx]] = [taskLists[targetIdx], taskLists[idx]];
  saveTaskLists();
}

export function sortTaskLists(mode) {
  const builtIn = taskLists.filter((l) => l.builtIn);
  const custom = taskLists.filter((l) => !l.builtIn);
  if (mode === "alpha") {
    custom.sort((a, b) => a.name.localeCompare(b.name));
  } else if (mode === "date") {
    custom.sort((a, b) => new Date(a.createdAt) - new Date(b.createdAt));
  }
  taskLists.length = 0;
  taskLists.push(...builtIn, ...custom);
  saveTaskLists();
}

// BroadcastChannel for task lists
const taskListChannel = typeof BroadcastChannel !== "undefined"
  ? new BroadcastChannel("kon_task_lists")
  : null;

if (taskListChannel) {
  taskListChannel.onmessage = (event) => {
    if (event.data.type === "task_lists_updated") {
      taskLists.length = 0;
      taskLists.push(...event.data.lists);
    }
  };
}

function broadcastTaskLists() {
  if (taskListChannel) {
    taskListChannel.postMessage({ type: "task_lists_updated", lists: $state.snapshot(taskLists) });
  }
}

// ---- Templates (persisted to localStorage) ----

const TEMPLATES_KEY = "kon_templates";

function loadTemplates() {
  try {
    const raw = localStorage.getItem(TEMPLATES_KEY);
    if (raw) return JSON.parse(raw);
  } catch {}
  return [
    { name: "Meeting Notes", sections: ["Attendees", "Agenda", "Discussion", "Action Items", "Next Steps"] },
    { name: "Report", sections: ["Summary", "Background", "Findings", "Recommendations"] },
    { name: "Interview", sections: ["Candidate", "Role", "Questions & Answers", "Assessment", "Next Steps"] },
  ];
}

export const templates = $state(loadTemplates());

export function saveTemplates() {
  try {
    localStorage.setItem(TEMPLATES_KEY, JSON.stringify(templates));
  } catch {}
}