import {
  APIKey,
  AuthStatus,
  DashboardStats,
  Document,
  DocumentBlock,
  DocShare,
  DocLockInfo,
  ListItem,
  Organization,
  PriorityLevel,
  SharedList,
  Space,
  SystemSettings,
  Team,
  TaskList,
  Thought,
  SubTask,
  User,
  UserInvite,
  WSMessage,
} from './types';

const TOKEN_STORAGE_KEY = 'mindsift_jwt_token';
const OFFLINE_QUEUE_KEY = 'mindsift_offline_capture_queue';

export function getToken(): string | null {
  return localStorage.getItem(TOKEN_STORAGE_KEY);
}

export function setToken(token: string): void {
  localStorage.setItem(TOKEN_STORAGE_KEY, token);
}

export function clearToken(): void {
  localStorage.removeItem(TOKEN_STORAGE_KEY);
}

export function triggerHaptic(pattern: number | number[] = 15): void {
  try {
    if (typeof navigator !== 'undefined' && 'vibrate' in navigator) {
      navigator.vibrate(pattern);
    }
  } catch {
    // Ignore on desktop browsers
  }
}

function ensureArray<T>(val: T[] | null | undefined): T[] {
  return Array.isArray(val) ? val : [];
}

async function request<T>(path: string, options: RequestInit = {}): Promise<T> {
  const token = getToken();
  const headers: Record<string, string> = {
    'Content-Type': 'application/json',
    'Cache-Control': 'no-cache',
    ...(options.headers as Record<string, string>),
  };

  if (token) {
    headers['Authorization'] = `Bearer ${token}`;
  }

  const controller = new AbortController();
  const timeoutId = window.setTimeout(() => controller.abort(), 12000);

  let res: Response;
  try {
    res = await fetch(path, {
      ...options,
      headers,
      cache: 'no-store',
      signal: controller.signal,
    });
  } finally {
    window.clearTimeout(timeoutId);
  }

  if (
    res.status === 401 &&
    !path.includes('/auth/login') &&
    !path.includes('/auth/register') &&
    !path.includes('/auth/setup') &&
    !path.includes('/auth/status')
  ) {
    clearToken();
    window.dispatchEvent(new CustomEvent('mindsift:unauthorized'));
  }

  if (!res.ok) {
    let errMsg = `HTTP ${res.status}`;
    try {
      const errData = await res.json();
      if (errData.error) errMsg = errData.error;
    } catch {
      // ignore
    }
    throw new Error(errMsg);
  }

  return res.json();
}

export const api = {
  // --- AUTH, FIRST-BOOT SETUP & SETTINGS ---
  async getAuthStatus(): Promise<AuthStatus> {
    return request<AuthStatus>('/api/v1/auth/status');
  },

  async completeSetup(payload: {
    email: string;
    password: string;
    displayName: string;
    instanceName?: string;
    sharingMode?: 'open' | 'teams_only' | 'strict_private';
    allowRegistration?: boolean;
    createSampleData?: boolean;
  }): Promise<{ token: string; user: User }> {
    const res = await request<{ token: string; user: User }>('/api/v1/auth/setup', {
      method: 'POST',
      body: JSON.stringify(payload),
    });
    setToken(res.token);
    return res;
  },

  async login(email: string, password: string): Promise<{ token: string; user: User }> {
    const res = await request<{ token: string; user: User }>('/api/v1/auth/login', {
      method: 'POST',
      body: JSON.stringify({ email, password }),
    });
    setToken(res.token);
    return res;
  },

  async register(
    email: string,
    password: string,
    displayName: string,
    inviteCode?: string
  ): Promise<{ token: string; user: User }> {
    const res = await request<{ token: string; user: User }>('/api/v1/auth/register', {
      method: 'POST',
      body: JSON.stringify({ email, password, displayName, inviteCode: inviteCode || '' }),
    });
    setToken(res.token);
    return res;
  },

  async getMe(): Promise<{ user: User; stats: DashboardStats }> {
    return request<{ user: User; stats: DashboardStats }>('/api/v1/auth/me');
  },

  async updateSettings(patch: {
    displayName?: string;
    email?: string;
    password?: string;
    alarmChannels?: string[];
    alarmEmail?: string;
    discordWebhookUrl?: string;
    customWebhookUrl?: string;
    notifyBeforeMinutes?: number;
  }): Promise<User> {
    return request<User>('/api/v1/auth/settings', {
      method: 'PATCH',
      body: JSON.stringify(patch),
    });
  },

  async testAlarmChannel(
    channel: 'email' | 'discord' | 'webhook',
    target?: string
  ): Promise<{ status: string }> {
    return request<{ status: string }>('/api/v1/auth/alarms/test', {
      method: 'POST',
      body: JSON.stringify({ channel, target: target || '' }),
    });
  },

  async getStats(): Promise<DashboardStats> {
    return request<DashboardStats>('/api/v1/stats');
  },

  async getUsersDirectory(): Promise<User[]> {
    const res = await request<User[]>('/api/v1/users/directory');
    return ensureArray(res);
  },

  // --- INSTANT CAPTURE & OFFLINE SYNC ---
  async captureThought(
    content: string,
    priority: PriorityLevel = 'normal',
    source: 'manual' | 'voice' = 'manual',
    dueDate = '',
    options?: {
      target?: 'inbox' | 'task' | 'list_item' | 'document';
      targetListId?: string;
      taskListId?: string;
    }
  ): Promise<Thought> {
    try {
      const thought = await request<Thought>('/api/v1/inbox', {
        method: 'POST',
        body: JSON.stringify({
          content,
          priority,
          source,
          dueDate,
          target: options?.target || 'inbox',
          targetListId: options?.targetListId || '',
          taskListId: options?.taskListId || '',
        }),
      });
      return thought;
    } catch {
      // Queue locally if offline
      const queue = getOfflineQueue();
      const offlineThought: Thought = {
        id: `th_offline_${Date.now()}`,
        userId: 'offline',
        content,
        tags: (content.match(/#([a-zA-Z0-9äöüÄÖÜß_-]+)/g) || []).map((t) => t.slice(1).toLowerCase()),
        priority,
        source,
        status: 'inbox',
        isCompleted: false,
        dueDate,
        taskListId: options?.taskListId || '',
        createdAt: new Date().toISOString(),
      };
      queue.push(offlineThought);
      localStorage.setItem(OFFLINE_QUEUE_KEY, JSON.stringify(queue));
      return offlineThought;
    }
  },

  async flushOfflineQueue(): Promise<number> {
    const queue = getOfflineQueue();
    if (queue.length === 0) return 0;

    let synced = 0;
    const remaining: Thought[] = [];

    for (const item of queue) {
      try {
        await request<Thought>('/api/v1/inbox', {
          method: 'POST',
          body: JSON.stringify({
            content: item.content,
            priority: item.priority,
            source: item.source,
            dueDate: item.dueDate || '',
            taskListId: item.taskListId || '',
          }),
        });
        synced++;
      } catch {
        remaining.push(item);
      }
    }

    localStorage.setItem(OFFLINE_QUEUE_KEY, JSON.stringify(remaining));
    return synced;
  },

  // --- THOUGHTS, TRIAGE & TASKS ---
  async getTriageDeck(): Promise<Thought[]> {
    const res = await request<Thought[]>('/api/v1/triage/deck');
    return ensureArray(res);
  },

  async getThoughts(status = 'all'): Promise<Thought[]> {
    const res = await request<Thought[]>(`/api/v1/thoughts?status=${encodeURIComponent(status)}`);
    return ensureArray(res);
  },

  async triageAction(
    thoughtId: string,
    action: 'keep' | 'discard' | 'restore',
    options?: {
      convertTo?: 'task' | 'document' | 'list_item';
      targetListId?: string;
      taskListId?: string;
      dueDate?: string;
    }
  ): Promise<Thought> {
    return request<Thought>(`/api/v1/triage/${thoughtId}`, {
      method: 'PATCH',
      body: JSON.stringify({
        action,
        convertTo: options?.convertTo || '',
        targetListId: options?.targetListId || '',
        taskListId: options?.taskListId || '',
        dueDate: options?.dueDate || '',
      }),
    });
  },

  async getTasks(taskListId?: string): Promise<Thought[]> {
    const query = taskListId ? `?taskListId=${encodeURIComponent(taskListId)}` : '';
    const res = await request<Thought[]>(`/api/v1/tasks${query}`);
    return ensureArray(res);
  },

  async updateThought(
    thoughtId: string,
    patch: {
      content?: string;
      isCompleted?: boolean;
      dueDate?: string;
      priority?: PriorityLevel;
      taskListId?: string;
      kanbanStatus?: 'todo' | 'in_progress' | 'done';
      notes?: string;
      subtasks?: SubTask[];
    }
  ): Promise<Thought> {
    return request<Thought>(`/api/v1/thoughts/${thoughtId}`, {
      method: 'PATCH',
      body: JSON.stringify(patch),
    });
  },

  async deleteThought(thoughtId: string): Promise<void> {
    await request(`/api/v1/thoughts/${thoughtId}`, { method: 'DELETE' });
  },

  async purgeDiscarded(): Promise<{ purged: number }> {
    return request<{ purged: number }>('/api/v1/thoughts/discarded/purge', { method: 'DELETE' });
  },

  // --- TASK LISTS ---
  async getTaskLists(): Promise<TaskList[]> {
    const res = await request<TaskList[]>('/api/v1/task-lists');
    return ensureArray(res);
  },

  async createTaskList(payload: {
    title: string;
    icon?: string;
    color?: string;
    spaceId?: string;
  }): Promise<TaskList> {
    return request<TaskList>('/api/v1/task-lists', {
      method: 'POST',
      body: JSON.stringify(payload),
    });
  },

  async updateTaskList(
    id: string,
    patch: {
      title?: string;
      icon?: string;
      color?: string;
      spaceId?: string;
    }
  ): Promise<TaskList> {
    return request<TaskList>(`/api/v1/task-lists/${id}`, {
      method: 'PUT',
      body: JSON.stringify(patch),
    });
  },

  async deleteTaskList(id: string): Promise<void> {
    await request(`/api/v1/task-lists/${id}`, { method: 'DELETE' });
  },

  // --- WORKSPACE DOCUMENTS ---
  async getDocuments(): Promise<Document[]> {
    const res = await request<Document[]>('/api/v1/documents');
    return ensureArray(res).map((d) => ({
      ...d,
      blocks: ensureArray(d.blocks),
      tags: ensureArray(d.tags),
    }));
  },

  async getDocument(id: string): Promise<Document> {
    const d = await request<Document>(`/api/v1/documents/${id}`);
    return {
      ...d,
      blocks: ensureArray(d.blocks),
      tags: ensureArray(d.tags),
    };
  },

  async createDocument(payload: {
    title: string;
    icon?: string;
    folderPath?: string;
    blocks?: DocumentBlock[];
    tags?: string[];
    isPinned?: boolean;
  }): Promise<Document> {
    const d = await request<Document>('/api/v1/documents', {
      method: 'POST',
      body: JSON.stringify(payload),
    });
    return {
      ...d,
      blocks: ensureArray(d.blocks),
      tags: ensureArray(d.tags),
    };
  },

  async updateDocument(
    id: string,
    patch: {
      title?: string;
      icon?: string;
      folderPath?: string;
      blocks?: DocumentBlock[];
      tags?: string[];
      isPinned?: boolean;
    }
  ): Promise<Document> {
    const d = await request<Document>(`/api/v1/documents/${id}`, {
      method: 'PUT',
      body: JSON.stringify(patch),
    });
    return {
      ...d,
      blocks: ensureArray(d.blocks),
      tags: ensureArray(d.tags),
    };
  },

  async deleteDocument(id: string): Promise<void> {
    await request(`/api/v1/documents/${id}`, { method: 'DELETE' });
  },

  // --- DOCUMENT SHARING ---
  async getDocShares(docId: string): Promise<DocShare[]> {
    const res = await request<DocShare[]>(`/api/v1/documents/${docId}/shares`);
    return ensureArray(res);
  },

  async createDocShare(
    docId: string,
    payload: { userId?: string; email?: string; permission: 'read' | 'write' }
  ): Promise<DocShare> {
    return request<DocShare>(`/api/v1/documents/${docId}/shares`, {
      method: 'POST',
      body: JSON.stringify(payload),
    });
  },

  async deleteDocShare(docId: string, userId: string): Promise<void> {
    await request(`/api/v1/documents/${docId}/shares/${userId}`, { method: 'DELETE' });
  },

  async getCollaborators(): Promise<User[]> {
    const res = await request<User[]>('/api/v1/collaborators');
    return ensureArray(res);
  },

  // --- DOCUMENT LOCKING ---
  async getDocLock(docId: string): Promise<{ locked: boolean; lock?: DocLockInfo }> {
    return request<{ locked: boolean; lock?: DocLockInfo }>(`/api/v1/documents/${docId}/lock`);
  },

  async lockDocument(
    docId: string
  ): Promise<{ locked: boolean; acquired: boolean; lock?: DocLockInfo; message?: string }> {
    try {
      return await request<{ locked: boolean; acquired: boolean; lock?: DocLockInfo; message?: string }>(
        `/api/v1/documents/${docId}/lock`,
        { method: 'POST' }
      );
    } catch (e: any) {
      return { locked: true, acquired: false, message: e.message };
    }
  },

  async heartbeatDocLock(docId: string): Promise<{ extended: boolean }> {
    try {
      return await request<{ extended: boolean }>(`/api/v1/documents/${docId}/lock/heartbeat`, {
        method: 'POST',
      });
    } catch {
      return { extended: false };
    }
  },

  async unlockDocument(docId: string): Promise<{ unlocked: boolean }> {
    try {
      return await request<{ unlocked: boolean }>(`/api/v1/documents/${docId}/lock`, {
        method: 'DELETE',
      });
    } catch {
      return { unlocked: false };
    }
  },

  // --- SPACES & REALTIME LISTS ---
  async getSpaces(): Promise<Space[]> {
    const res = await request<Space[]>('/api/v1/spaces');
    return ensureArray(res).map((s) => ({
      ...s,
      members: ensureArray(s.members),
    }));
  },

  async createSpace(name: string, icon: string, description: string): Promise<Space> {
    return request<Space>('/api/v1/spaces', {
      method: 'POST',
      body: JSON.stringify({ name, icon, description }),
    });
  },

  async joinSpace(inviteCode: string): Promise<Space> {
    return request<Space>('/api/v1/spaces/join', {
      method: 'POST',
      body: JSON.stringify({ inviteCode }),
    });
  },

  async getSpaceLists(spaceId: string): Promise<SharedList[]> {
    const res = await request<SharedList[]>(`/api/v1/spaces/${spaceId}/lists`);
    return ensureArray(res).map((l) => ({
      ...l,
      items: ensureArray(l.items),
    }));
  },

  async getAllLists(): Promise<SharedList[]> {
    const res = await request<SharedList[]>('/api/v1/lists');
    return ensureArray(res).map((l) => ({
      ...l,
      items: ensureArray(l.items),
    }));
  },

  async createList(spaceId: string, title: string, icon: string, listType: 'shopping' | 'checklist' | 'vacation'): Promise<SharedList> {
    const l = await request<SharedList>(`/api/v1/spaces/${spaceId}/lists`, {
      method: 'POST',
      body: JSON.stringify({ title, icon, listType }),
    });
    return {
      ...l,
      items: ensureArray(l.items),
    };
  },

  async deleteList(listId: string): Promise<void> {
    await request(`/api/v1/lists/${listId}`, { method: 'DELETE' });
  },

  async createListItem(listId: string, content: string, category = '', quantity = ''): Promise<ListItem> {
    return request<ListItem>(`/api/v1/lists/${listId}/items`, {
      method: 'POST',
      body: JSON.stringify({ content, category, quantity }),
    });
  },

  async toggleListItem(listId: string, itemId: string, isCompleted?: boolean): Promise<ListItem> {
    return request<ListItem>(`/api/v1/lists/${listId}/items/${itemId}`, {
      method: 'PATCH',
      body: JSON.stringify({ isCompleted }),
    });
  },

  async deleteListItem(listId: string, itemId: string): Promise<void> {
    await request(`/api/v1/lists/${listId}/items/${itemId}`, { method: 'DELETE' });
  },

  async clearCompletedItems(listId: string): Promise<{ removed: number }> {
    return request<{ removed: number }>(`/api/v1/lists/${listId}/clear-completed`, {
      method: 'POST',
    });
  },

  // --- ORGANIZATIONS & TEAMS ---
  async getOrganizations(): Promise<Organization[]> {
    const res = await request<Organization[]>('/api/v1/organizations');
    return ensureArray(res).map((o) => ({
      ...o,
      teams: ensureArray(o.teams).map((t) => ({
        ...t,
        members: ensureArray(t.members),
      })),
    }));
  },

  async createOrganization(name: string): Promise<Organization> {
    return request<Organization>('/api/v1/organizations', {
      method: 'POST',
      body: JSON.stringify({ name }),
    });
  },

  async deleteOrganization(id: string): Promise<void> {
    await request(`/api/v1/organizations/${id}`, { method: 'DELETE' });
  },

  async getOrgTeams(orgId: string): Promise<Team[]> {
    const res = await request<Team[]>(`/api/v1/organizations/${orgId}/teams`);
    return ensureArray(res).map((t) => ({ ...t, members: ensureArray(t.members) }));
  },

  async createOrgTeam(orgId: string, name: string, description: string): Promise<Team> {
    return request<Team>(`/api/v1/organizations/${orgId}/teams`, {
      method: 'POST',
      body: JSON.stringify({ name, description }),
    });
  },

  async deleteTeam(teamId: string): Promise<void> {
    await request(`/api/v1/teams/${teamId}`, { method: 'DELETE' });
  },

  async getUserTeams(): Promise<Team[]> {
    const res = await request<Team[]>('/api/v1/teams');
    return ensureArray(res).map((t) => ({ ...t, members: ensureArray(t.members) }));
  },

  async addTeamMember(
    teamId: string,
    payload: { userId?: string; email?: string; role: string }
  ): Promise<void> {
    await request(`/api/v1/teams/${teamId}/members`, {
      method: 'POST',
      body: JSON.stringify(payload),
    });
  },

  async removeTeamMember(teamId: string, userId: string): Promise<void> {
    await request(`/api/v1/teams/${teamId}/members/${userId}`, { method: 'DELETE' });
  },

  // --- ADMIN & STAFF PANEL ---
  async adminGetUsers(): Promise<User[]> {
    const res = await request<User[]>('/api/v1/admin/users');
    return ensureArray(res);
  },

  async adminCreateUser(payload: {
    email: string;
    password: string;
    displayName: string;
    role: string;
  }): Promise<User> {
    return request<User>('/api/v1/admin/users', {
      method: 'POST',
      body: JSON.stringify(payload),
    });
  },

  async adminUpdateUser(
    id: string,
    patch: {
      displayName?: string;
      email?: string;
      role?: string;
      isActive?: boolean;
      discordWebhookUrl?: string;
    }
  ): Promise<User> {
    return request<User>(`/api/v1/admin/users/${id}`, {
      method: 'PATCH',
      body: JSON.stringify(patch),
    });
  },

  async adminResetPassword(id: string, password: string): Promise<void> {
    await request(`/api/v1/admin/users/${id}/password`, {
      method: 'PUT',
      body: JSON.stringify({ password }),
    });
  },

  async adminDeleteUser(id: string): Promise<void> {
    await request(`/api/v1/admin/users/${id}`, { method: 'DELETE' });
  },

  async adminGetInvites(): Promise<UserInvite[]> {
    const res = await request<UserInvite[]>('/api/v1/admin/invites');
    return ensureArray(res);
  },

  async adminCreateInvite(payload: {
    email?: string;
    role: string;
    teamId?: string;
  }): Promise<UserInvite> {
    return request<UserInvite>('/api/v1/admin/invites', {
      method: 'POST',
      body: JSON.stringify(payload),
    });
  },

  async adminDeleteInvite(id: string): Promise<void> {
    await request(`/api/v1/admin/invites/${id}`, { method: 'DELETE' });
  },

  async adminGetSettings(): Promise<SystemSettings> {
    return request<SystemSettings>('/api/v1/admin/settings');
  },

  async adminUpdateSettings(settings: SystemSettings): Promise<SystemSettings> {
    return request<SystemSettings>('/api/v1/admin/settings', {
      method: 'PUT',
      body: JSON.stringify(settings),
    });
  },

  async adminTestSMTP(toEmail: string): Promise<{ status: string }> {
    return request<{ status: string }>('/api/v1/admin/smtp/test', {
      method: 'POST',
      body: JSON.stringify({ toEmail }),
    });
  },

  // --- API KEYS, WEBHOOKS & EXPORT ---
  async getAPIKeys(): Promise<APIKey[]> {
    const res = await request<APIKey[]>('/api/v1/keys');
    return ensureArray(res);
  },

  async createAPIKey(name: string): Promise<APIKey> {
    return request<APIKey>('/api/v1/keys', {
      method: 'POST',
      body: JSON.stringify({ name }),
    });
  },

  async deleteAPIKey(id: string): Promise<void> {
    await request(`/api/v1/keys/${id}`, { method: 'DELETE' });
  },

  async testWebhookIngest(
    token: string,
    title: string,
    priority: PriorityLevel,
    tags: string[]
  ): Promise<{ status: string; thought: Thought }> {
    return request<{ status: string; thought: Thought }>(
      `/api/v1/webhooks/ingest?token=${encodeURIComponent(token)}`,
      {
        method: 'POST',
        body: JSON.stringify({ title, priority, tags }),
      }
    );
  },

  async searchAll(q: string): Promise<{ thoughts: Thought[]; documents: Document[] }> {
    return request<{ thoughts: Thought[]; documents: Document[] }>(
      `/api/v1/search?q=${encodeURIComponent(q)}`
    );
  },

  async exportAll(): Promise<any> {
    return request<any>('/api/v1/export');
  },
};

export function getOfflineQueue(): Thought[] {
  try {
    const raw = localStorage.getItem(OFFLINE_QUEUE_KEY);
    if (!raw) return [];
    return JSON.parse(raw);
  } catch {
    return [];
  }
}

let activeGlobalWS: WebSocket | null = null;
let wsReconnectTimer: any = null;
let wsListeners: ((msg: WSMessage) => void)[] = [];
let manualDisconnect = false;

export function buildWebSocketURL(spaceId?: string): string {
  const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
  const token = getToken() || '';
  if (spaceId) {
    return `${protocol}//${window.location.host}/api/v1/ws/spaces/${encodeURIComponent(spaceId)}?token=${encodeURIComponent(token)}`;
  }
  return `${protocol}//${window.location.host}/api/v1/ws?token=${encodeURIComponent(token)}`;
}

export function connectWebSocket(): void {
  const token = getToken();
  if (!token) return;
  manualDisconnect = false;

  if (activeGlobalWS && (activeGlobalWS.readyState === WebSocket.OPEN || activeGlobalWS.readyState === WebSocket.CONNECTING)) {
    return;
  }

  try {
    const url = buildWebSocketURL();
    const ws = new WebSocket(url);
    activeGlobalWS = ws;

    ws.onmessage = (event) => {
      try {
        const msg = JSON.parse(event.data) as WSMessage;
        wsListeners.forEach((fn) => {
          try {
            fn(msg);
          } catch (e) {
            console.error('WS listener error', e);
          }
        });
        window.dispatchEvent(new CustomEvent('mindsift:ws', { detail: msg }));
      } catch (err) {
        console.error('Failed to parse WS message', err);
      }
    };

    ws.onclose = () => {
      activeGlobalWS = null;
      if (!manualDisconnect && getToken()) {
        clearTimeout(wsReconnectTimer);
        wsReconnectTimer = setTimeout(() => {
          connectWebSocket();
        }, 3000);
      }
    };

    ws.onerror = () => {
      try {
        ws.close();
      } catch {}
    };
  } catch (e) {
    console.error('Failed to connect WebSocket', e);
  }
}

export function disconnectWebSocket(): void {
  manualDisconnect = true;
  clearTimeout(wsReconnectTimer);
  if (activeGlobalWS) {
    try {
      activeGlobalWS.close();
    } catch {}
    activeGlobalWS = null;
  }
}

export function sendWebSocketMessage(msg: any): void {
  if (activeGlobalWS && activeGlobalWS.readyState === WebSocket.OPEN) {
    activeGlobalWS.send(typeof msg === 'string' ? msg : JSON.stringify(msg));
  }
}

export function onWebSocketMessage(callback: (msg: WSMessage) => void): () => void {
  wsListeners.push(callback);
  return () => {
    wsListeners = wsListeners.filter((fn) => fn !== callback);
  };
}