import type {
  AlertRule,
  AlertRuleUpdate,
  Asset,
  CheckResult,
  Incident,
  Monitor,
  MonitorUpdate,
  NotificationChannel,
  NotificationChannelCreate,
  NotificationChannelUpdate,
  PingMonitorCreate,
  SnmpCredentialProfile,
  SnmpCredentialProfileCreate,
  SnmpCredentialProfileUpdate,
  TcpMonitorCreate,
  User,
  WebsiteMonitorCreate,
} from "../types/api";

const API_BASE_URL = import.meta.env.VITE_API_BASE_URL ?? "http://localhost:8000";

export interface LoginResponse {
  access_token: string;
  token_type: string;
}

async function request<T>(path: string, token?: string, init: RequestInit = {}): Promise<T> {
  const headers = new Headers(init.headers);
  if (token) {
    headers.set("Authorization", `Bearer ${token}`);
  }
  if (init.body && !headers.has("Content-Type")) {
    headers.set("Content-Type", "application/json");
  }

  const response = await fetch(`${API_BASE_URL}${path}`, { ...init, headers });
  if (!response.ok) {
    const message = await response.text();
    throw new Error(message || `Request failed with ${response.status}`);
  }
  if (response.status === 204) {
    return undefined as T;
  }
  return (await response.json()) as T;
}

export async function login(email: string, password: string): Promise<LoginResponse> {
  const body = new URLSearchParams();
  body.set("username", email);
  body.set("password", password);

  const response = await fetch(`${API_BASE_URL}/auth/login`, {
    method: "POST",
    body,
  });
  if (!response.ok) {
    throw new Error("Invalid email or password");
  }
  return (await response.json()) as LoginResponse;
}

export const api = {
  me: (token: string) => request<User>("/auth/me", token),
  assets: (token: string) => request<Asset[]>("/assets", token),
  monitors: (token: string) => request<Monitor[]>("/monitors", token),
  createWebsiteMonitor: (token: string, payload: WebsiteMonitorCreate) =>
    request<Monitor>("/monitors/website", token, {
      method: "POST",
      body: JSON.stringify(payload),
    }),
  createPingMonitor: (token: string, payload: PingMonitorCreate) =>
    request<Monitor>("/monitors/ping", token, {
      method: "POST",
      body: JSON.stringify(payload),
    }),
  createTcpMonitor: (token: string, payload: TcpMonitorCreate) =>
    request<Monitor>("/monitors/tcp", token, {
      method: "POST",
      body: JSON.stringify(payload),
    }),
  updateMonitor: (token: string, monitorId: number, payload: MonitorUpdate) =>
    request<Monitor>(`/monitors/${monitorId}`, token, {
      method: "PATCH",
      body: JSON.stringify(payload),
    }),
  deleteMonitor: (token: string, monitorId: number) =>
    request<void>(`/monitors/${monitorId}`, token, {
      method: "DELETE",
    }),
  monitorResults: (token: string, monitorId: number, limit = 1) =>
    request<CheckResult[]>(`/monitors/${monitorId}/results?limit=${limit}`, token),
  alertRules: (token: string) => request<AlertRule[]>("/alerts/rules", token),
  updateAlertRule: (token: string, ruleId: number, payload: AlertRuleUpdate) =>
    request<AlertRule>(`/alerts/rules/${ruleId}`, token, {
      method: "PATCH",
      body: JSON.stringify(payload),
    }),
  incidents: (token: string) => request<Incident[]>("/incidents", token),
  acknowledgeIncident: (token: string, incidentId: number) =>
    request<Incident>(`/incidents/${incidentId}/acknowledge`, token, {
      method: "POST",
    }),
  silenceIncident: (token: string, incidentId: number, minutes = 60) =>
    request<Incident>(`/incidents/${incidentId}/silence?minutes=${minutes}`, token, {
      method: "POST",
    }),
  notificationChannels: (token: string) => request<NotificationChannel[]>("/notifications/channels", token),
  createNotificationChannel: (token: string, payload: NotificationChannelCreate) =>
    request<NotificationChannel>("/notifications/channels", token, {
      method: "POST",
      body: JSON.stringify(payload),
    }),
  updateNotificationChannel: (token: string, channelId: number, payload: NotificationChannelUpdate) =>
    request<NotificationChannel>(`/notifications/channels/${channelId}`, token, {
      method: "PATCH",
      body: JSON.stringify(payload),
    }),
  testNotificationChannel: (token: string, channelId: number) =>
    request<{ status: string; message: string }>(`/notifications/channels/${channelId}/test`, token, {
      method: "POST",
    }),
  deleteNotificationChannel: (token: string, channelId: number) =>
    request<void>(`/notifications/channels/${channelId}`, token, {
      method: "DELETE",
    }),
  snmpCredentialProfiles: (token: string) => request<SnmpCredentialProfile[]>("/credentials/snmp", token),
  createSnmpCredentialProfile: (token: string, payload: SnmpCredentialProfileCreate) =>
    request<SnmpCredentialProfile>("/credentials/snmp", token, {
      method: "POST",
      body: JSON.stringify(payload),
    }),
  updateSnmpCredentialProfile: (token: string, profileId: number, payload: SnmpCredentialProfileUpdate) =>
    request<SnmpCredentialProfile>(`/credentials/snmp/${profileId}`, token, {
      method: "PATCH",
      body: JSON.stringify(payload),
    }),
  deleteSnmpCredentialProfile: (token: string, profileId: number) =>
    request<void>(`/credentials/snmp/${profileId}`, token, {
      method: "DELETE",
    }),
};