import { tokenStore } from "./token-store";

export const API_BASE =
  process.env.NEXT_PUBLIC_API_URL ?? "http://localhost:8080/api/v1";

// عکس‌ها از مسیر نسبی (/uploads/...) برمی‌گردن، نه URL کامل؛ باید به origin
// سرور (بدون /api/v1) وصل بشن.
export const API_ORIGIN = API_BASE.replace(/\/api\/v1\/?$/, "");
export function photoUrl(path: string) {
  if (!path) return "";
  if (path.startsWith("http")) return path;
  return `${API_ORIGIN}${path}`;
}

interface ApiEnvelope<T> {
  success: boolean;
  message?: string;
  data?: T;
  errors?: unknown;
}

export class ApiError extends Error {
  errors?: unknown;
  status: number;
  constructor(message: string, status: number, errors?: unknown) {
    super(message);
    this.status = status;
    this.errors = errors;
  }
}

// ---------------- انواع ----------------

export type ApprovalStatus = "pending" | "approved" | "rejected";

export type UserState = "inactive" | "active" | "blocked";

export interface UserProfile {
  id: number;
  phone: string;
  first_name?: string;
  gender?: "male" | "female";
  birth_date?: string;
  height_cm?: number;
  weight_kg?: number;
  current_step: number;
  is_onboarded: boolean;
  approval_status: ApprovalStatus;
  rejection_reason?: string;
  is_admin: boolean;
  state: UserState;
  blocked_reason?: string;
  blocked_at?: string;
}

export interface StepView {
  step: number;
  key: string;
  done: boolean;
}

export interface OnboardingStatus {
  current_step: number;
  current_step_key: string;
  is_onboarded: boolean;
  approval_status: ApprovalStatus;
  rejection_reason?: string;
  steps: StepView[];
}

export interface SelectionSummary {
  category_key: string;
  option_ids: number[];
  titles: string[];
}

export interface ProfileAnswer {
  id: number;
  user_id: number;
  question_id: number;
  answer: string;
  question?: ProfileQuestion;
}

export interface UserPhoto {
  id: number;
  user_id: number;
  url: string;
  sort_order: number;
}

export interface FullProfile {
  user: UserProfile;
  onboarding_status: OnboardingStatus;
  selections: SelectionSummary[];
  profile_answers: ProfileAnswer[];
  photos: UserPhoto[];
}

export interface TokenPair {
  access_token: string;
  refresh_token: string;
}

export interface AuthResponseData {
  tokens: TokenPair;
  user: UserProfile;
  is_new_user: boolean;
  onboarding_done: boolean;
}

export type CategoryKey =
  | "education_level"
  | "field_of_study"
  | "occupation"
  | "important_in_relationship"
  | "interest"
  | "looking_for";

export const ALL_CATEGORIES: { key: CategoryKey; fallbackTitle: string; emoji: string }[] = [
  { key: "education_level", fallbackTitle: "سطح تحصیلات", emoji: "🎓" },
  { key: "field_of_study", fallbackTitle: "رشته تحصیلی", emoji: "📚" },
  { key: "occupation", fallbackTitle: "فعالیت‌ها", emoji: "💼" },
  { key: "important_in_relationship", fallbackTitle: "اهمیت در رابطه", emoji: "❤️" },
  { key: "interest", fallbackTitle: "علاقه‌مندی‌ها", emoji: "✨" },
  { key: "looking_for", fallbackTitle: "دنبال چی می‌گردی", emoji: "🔍" },
];

export interface Category {
  id: number;
  key: CategoryKey;
  title: string;
  min_select: number;
  max_select: number;
  created_at: string;
  updated_at: string;
}

export interface Option {
  id: number;
  category_id: number;
  title: string;
  sort_order: number;
  is_active: boolean;
  created_at: string;
  updated_at: string;
}

export interface ProfileQuestion {
  id: number;
  text: string;
  sort_order: number;
  is_active: boolean;
  created_at: string;
  updated_at: string;
}

// ---------------- هسته‌ی fetch ----------------

let refreshPromise: Promise<boolean> | null = null;

async function rawRequest<T>(
  path: string,
  options: RequestInit = {},
  auth = false
): Promise<T> {
  const headers = new Headers(options.headers);
  headers.set("Content-Type", "application/json");
  if (auth) {
    const token = tokenStore.getAccess();
    if (token) headers.set("Authorization", `Bearer ${token}`);
  }

  const res = await fetch(`${API_BASE}${path}`, { ...options, headers });
  let body: ApiEnvelope<T> | null = null;
  try {
    body = await res.json();
  } catch {
    // بدنه‌ی خالی
  }

  if (!res.ok) {
    throw new ApiError(body?.message ?? "خطای غیرمنتظره از سرور", res.status, body?.errors);
  }
  return (body?.data as T) ?? (undefined as T);
}

async function authRequest<T>(path: string, options: RequestInit = {}): Promise<T> {
  try {
    return await rawRequest<T>(path, options, true);
  } catch (err) {
    if (err instanceof ApiError && err.status === 401) {
      const refreshed = await ensureRefreshed();
      if (refreshed) return await rawRequest<T>(path, options, true);
    }
    throw err;
  }
}

async function ensureRefreshed(): Promise<boolean> {
  const refresh = tokenStore.getRefresh();
  if (!refresh) return false;
  if (!refreshPromise) {
    refreshPromise = rawRequest<TokenPair>("/auth/token/refresh", {
      method: "POST",
      body: JSON.stringify({ refresh_token: refresh }),
    })
      .then((tokens) => {
        tokenStore.set(tokens.access_token, tokens.refresh_token);
        return true;
      })
      .catch(() => {
        tokenStore.clear();
        return false;
      })
      .finally(() => {
        refreshPromise = null;
      });
  }
  return refreshPromise;
}

// ---------------- احراز هویت ----------------

export function requestOtp(phone: string) {
  return rawRequest<null>("/auth/request-otp", {
    method: "POST",
    body: JSON.stringify({ phone }),
  });
}

export function verifyOtp(phone: string, otp: string) {
  return rawRequest<AuthResponseData>("/auth/verify-otp", {
    method: "POST",
    body: JSON.stringify({ phone, otp }),
  });
}

export function getProfileMe() {
  return authRequest<{ user: UserProfile }>("/profile/me");
}

// ---------------- ادمین: دسته‌ها و گزینه‌ها ----------------

export function getCategory(key: CategoryKey) {
  return authRequest<Category>(`/admin/categories/${key}`);
}

export function updateCategory(
  key: CategoryKey,
  payload: { title?: string; min_select?: number; max_select?: number }
) {
  return authRequest<Category>(`/admin/categories/${key}`, {
    method: "PATCH",
    body: JSON.stringify(payload),
  });
}

export function listOptions(key: CategoryKey) {
  return authRequest<Option[]>(`/admin/categories/${key}/options`);
}

export function createOption(key: CategoryKey, payload: { title: string; sort_order?: number }) {
  return authRequest<Option>(`/admin/categories/${key}/options`, {
    method: "POST",
    body: JSON.stringify(payload),
  });
}

export function updateOption(
  id: number,
  payload: { title?: string; sort_order?: number; is_active?: boolean }
) {
  return authRequest<Option>(`/admin/options/${id}`, {
    method: "PATCH",
    body: JSON.stringify(payload),
  });
}

export function deleteOption(id: number) {
  return authRequest<null>(`/admin/options/${id}`, { method: "DELETE" });
}

// ---------------- ادمین: سوالات پروفایل ----------------

export function listQuestions() {
  return authRequest<ProfileQuestion[]>("/admin/profile-questions");
}

export function createQuestion(payload: { text: string; sort_order?: number }) {
  return authRequest<ProfileQuestion>("/admin/profile-questions", {
    method: "POST",
    body: JSON.stringify(payload),
  });
}

export function updateQuestion(
  id: number,
  payload: { text?: string; sort_order?: number; is_active?: boolean }
) {
  return authRequest<ProfileQuestion>(`/admin/profile-questions/${id}`, {
    method: "PATCH",
    body: JSON.stringify(payload),
  });
}

export function deleteQuestion(id: number) {
  return authRequest<null>(`/admin/profile-questions/${id}`, { method: "DELETE" });
}

// ---------------- ادمین: بررسی و تایید کاربران ----------------

export interface PendingUserView extends UserProfile {
  photos: string[];
}

export function listPendingUsers() {
  return authRequest<PendingUserView[]>("/admin/users/pending");
}

export function getUserDetail(id: number) {
  return authRequest<FullProfile>(`/admin/users/${id}`);
}

export function approveUser(id: number) {
  return authRequest<UserProfile>(`/admin/users/${id}/approve`, { method: "POST" });
}

export function rejectUser(id: number, reason: string) {
  return authRequest<UserProfile>(`/admin/users/${id}/reject`, {
    method: "POST",
    body: JSON.stringify({ reason }),
  });
}

// ---------------- ادمین: مانیتورینگ ----------------

export interface MonitoringSummary {
  total_requests: number;
  total_errors: number;
  error_rate_pct: number;
  avg_latency_ms: number;
  p95_latency_ms: number;
  requests_last_min: number;
  started_at: string;
  uptime_seconds: number;
}

export interface RequestLogEntry {
  time: string;
  method: string;
  path: string;
  status_code: number;
  duration_ms: number;
  client_ip: string;
  user_id?: number;
}

export function getMonitoringSummary() {
  return authRequest<MonitoringSummary>("/admin/monitoring/summary");
}

export function getRecentRequests(limit = 100, userId?: number) {
  const userParam = userId ? `&user_id=${userId}` : "";
  return authRequest<RequestLogEntry[]>(`/admin/monitoring/requests?limit=${limit}${userParam}`);
}

// ---------------- ادمین: همه‌ی کاربران، بلاک/آنبلاک، گزارش ----------------

export interface AdminUserListItem extends UserProfile {
  report_count: number;
}

interface PaginatedResult<T> {
  items: T[];
  total: number;
  page: number;
  page_size: number;
}

export function listAllUsers(search: string, page = 1, pageSize = 25) {
  const searchParam = search ? `&search=${encodeURIComponent(search)}` : "";
  return authRequest<PaginatedResult<AdminUserListItem>>(
    `/admin/users?page=${page}&page_size=${pageSize}${searchParam}`
  );
}

export function blockUser(id: number, reason: string) {
  return authRequest<UserProfile>(`/admin/users/${id}/block`, {
    method: "POST",
    body: JSON.stringify({ reason }),
  });
}

export function unblockUser(id: number) {
  return authRequest<UserProfile>(`/admin/users/${id}/unblock`, { method: "POST" });
}

export interface Report {
  id: number;
  user_id: number;
  reason: string;
  created_at: string;
}

export function reportUser(id: number, reason: string) {
  return authRequest<Report>(`/admin/users/${id}/report`, {
    method: "POST",
    body: JSON.stringify({ reason }),
  });
}

export function listUserReports(id: number) {
  return authRequest<Report[]>(`/admin/users/${id}/reports`);
}

// ---------------- ادمین: مچ‌ها (رفقا) ----------------

export interface AdminMatchView {
  id: number;
  created_at: string;
  user_one_id: number;
  user_one_name: string;
  user_one_phone: string;
  user_two_id: number;
  user_two_name: string;
  user_two_phone: string;
}

export function listAllMatches(page = 1, pageSize = 25) {
  return authRequest<PaginatedResult<AdminMatchView>>(
    `/admin/matches?page=${page}&page_size=${pageSize}`
  );
}

// ---------------- ادمین: نظارت بر عکس‌ها ----------------

export interface AdminPhotoView {
  id: number;
  user_id: number;
  url: string;
  sort_order: number;
  created_at: string;
  owner_name: string;
  owner_phone: string;
}

export function listAllPhotos(page = 1, pageSize = 50) {
  return authRequest<PaginatedResult<AdminPhotoView>>(
    `/admin/photos?page=${page}&page_size=${pageSize}`
  );
}

export function deletePhotoAdmin(id: number) {
  return authRequest<null>(`/admin/photos/${id}`, { method: "DELETE" });
}

export function reportPhoto(id: number, reason: string) {
  return authRequest<Report>(`/admin/photos/${id}/report`, {
    method: "POST",
    body: JSON.stringify({ reason }),
  });
}

// ---------------- ادمین: بک‌آپ دیتابیس ----------------

export interface BackupInfo {
  filename: string;
  size_bytes: number;
  created_at: string;
}

export function listBackups() {
  return authRequest<BackupInfo[]>("/admin/backups");
}

export function createBackup() {
  return authRequest<BackupInfo>("/admin/backups", { method: "POST" });
}

// دانلود بک‌آپ نیاز به هدر Authorization داره (اندپوینت فقط-ادمینه)، پس نمی‌شه
// مستقیم از یک <a href> استفاده کرد؛ فایل رو با fetch احرازهویت‌شده می‌گیریم و
// خودمون دانلودش رو با یک لینک موقت شبیه‌سازی می‌کنیم.
export async function downloadBackup(filename: string) {
  const token = tokenStore.getAccess();
  const res = await fetch(`${API_BASE}/admin/backups/${encodeURIComponent(filename)}`, {
    headers: token ? { Authorization: `Bearer ${token}` } : {},
  });
  if (!res.ok) {
    throw new ApiError("دانلود بک‌آپ ناموفق بود", res.status);
  }
  const blob = await res.blob();
  const url = URL.createObjectURL(blob);
  const a = document.createElement("a");
  a.href = url;
  a.download = filename;
  document.body.appendChild(a);
  a.click();
  a.remove();
  URL.revokeObjectURL(url);
}