// apps/web/e2e/fixtures/api-client.ts

import type {
  PatientData, DoctorData, VitalSignsData, ScheduleData,
  AppointmentData, FollowUpTemplateData, FollowUpTaskData, AlertRuleData,
} from './test-data';

const API_BASE = process.env.E2E_API_URL || 'http://localhost:3000/api/v1';

interface ApiResponse<T> { success: boolean; data: T }
interface Versioned { id: string; version: number }
type VEntity<T> = T & Versioned;

interface LoginResponse {
  access_token: string;
  refresh_token: string;
  expires_in: number;
  user: { id: string; username: string; display_name: string; roles: string[] };
}

export class ApiClient {
  private token = '';

  async login(username?: string, password?: string): Promise<LoginResponse> {
    const res = await this.rawPost<{ success: boolean; data: LoginResponse }>(
      '/auth/login',
      {
        username: username || process.env.E2E_ADMIN_USER || 'admin',
        password: password || process.env.E2E_ADMIN_PASS || 'Admin@2026',
      },
    );
    this.token = res.data.access_token;
    return res.data;
  }

  async loginAsAdmin(): Promise<LoginResponse> {
    return this.login();
  }

  getToken(): string { return this.token; }

  async createPatient(overrides?: Partial<PatientData>): Promise<VEntity<Record<string, unknown>>> {
    return this.post('/health/patients', overrides ?? {});
  }

  async updatePatient(id: string, version: number, data: Partial<PatientData>): Promise<VEntity<Record<string, unknown>>> {
    return this.put(`/health/patients/${id}`, { ...data, version });
  }

  async deletePatient(id: string, version: number): Promise<void> {
    await this.del(`/health/patients/${id}`, { version });
  }

  async createDoctor(overrides?: Partial<DoctorData>): Promise<VEntity<Record<string, unknown>>> {
    return this.post('/health/doctors', overrides ?? {});
  }

  async deleteDoctor(id: string, version: number): Promise<void> {
    await this.del(`/health/doctors/${id}`, { version });
  }

  async createVitalSigns(patientId: string, overrides?: Partial<VitalSignsData>): Promise<VEntity<Record<string, unknown>>> {
    return this.post(`/health/patients/${patientId}/vital-signs`, overrides ?? {});
  }

  async deleteVitalSigns(patientId: string, id: string, version: number): Promise<void> {
    await this.del(`/health/patients/${patientId}/vital-signs/${id}`, { version });
  }

  async createSchedule(overrides: ScheduleData): Promise<VEntity<Record<string, unknown>>> {
    return this.post('/health/doctor-schedules', overrides);
  }

  async deleteSchedule(id: string, version: number): Promise<void> {
    await this.del(`/health/doctor-schedules/${id}`, { version });
  }

  async createAppointment(overrides: AppointmentData): Promise<VEntity<Record<string, unknown>>> {
    return this.post('/health/appointments', overrides);
  }

  async updateAppointmentStatus(id: string, version: number, status: string): Promise<VEntity<Record<string, unknown>>> {
    return this.put(`/health/appointments/${id}/status`, { status, version });
  }

  async deleteAppointment(id: string, version: number): Promise<void> {
    await this.del(`/health/appointments/${id}`, { version });
  }

  async createFollowUpTemplate(overrides?: Partial<FollowUpTemplateData>): Promise<VEntity<Record<string, unknown>>> {
    return this.post('/health/follow-up-templates', overrides ?? {});
  }

  async deleteFollowUpTemplate(id: string, version: number): Promise<void> {
    await this.del(`/health/follow-up-templates/${id}`, { version });
  }

  async createFollowUpTask(overrides: FollowUpTaskData): Promise<VEntity<Record<string, unknown>>> {
    return this.post('/health/follow-up-tasks', overrides);
  }

  async deleteFollowUpTask(id: string, version: number): Promise<void> {
    await this.del(`/health/follow-up-tasks/${id}`, { version });
  }

  async createAlertRule(overrides?: Partial<AlertRuleData>): Promise<VEntity<Record<string, unknown>>> {
    return this.post('/health/alert-rules', overrides ?? {});
  }

  async deleteAlertRule(id: string, version: number): Promise<void> {
    await this.del(`/health/alert-rules/${id}`, { version });
  }

  async listAlerts(): Promise<VEntity<Record<string, unknown>>[]> {
    const res = await this.get<{ data: VEntity<Record<string, unknown>>[] }>('/health/alerts');
    return res.data ?? [];
  }

  async acknowledgeAlert(id: string, version: number): Promise<VEntity<Record<string, unknown>>> {
    return this.put(`/health/alerts/${id}/acknowledge`, { version });
  }

  async resolveAlert(id: string, version: number): Promise<VEntity<Record<string, unknown>>> {
    return this.put(`/health/alerts/${id}/resolve`, { version });
  }

  async dismissAlert(id: string, version: number): Promise<VEntity<Record<string, unknown>>> {
    return this.put(`/health/alerts/${id}/dismiss`, { version });
  }

  private async headers(): Promise<Record<string, string>> {
    return {
      'Content-Type': 'application/json',
      ...(this.token ? { Authorization: `Bearer ${this.token}` } : {}),
    };
  }

  private async parseJson<T>(res: Response, method: string, path: string): Promise<T> {
    if (!res.ok) {
      const text = await res.text().catch(() => '');
      throw new Error(`${method} ${path} → HTTP ${res.status}: ${text.slice(0, 200)}`);
    }
    const json = await res.json();
    if (!json.success) throw new Error(`${method} ${path} failed: ${json.error ?? 'unknown'}`);
    return json.data as T;
  }

  private async get<T>(path: string): Promise<T> {
    const res = await fetch(`${API_BASE}${path}`, { headers: await this.headers() });
    return this.parseJson<T>(res, 'GET', path);
  }

  private async post<T>(path: string, body: unknown): Promise<T> {
    const res = await fetch(`${API_BASE}${path}`, {
      method: 'POST',
      headers: await this.headers(),
      body: JSON.stringify(body),
    });
    return this.parseJson<T>(res, 'POST', path);
  }

  private async put<T>(path: string, body: unknown): Promise<T> {
    const res = await fetch(`${API_BASE}${path}`, {
      method: 'PUT',
      headers: await this.headers(),
      body: JSON.stringify(body),
    });
    return this.parseJson<T>(res, 'PUT', path);
  }

  private async del(path: string, body?: unknown): Promise<void> {
    const res = await fetch(`${API_BASE}${path}`, {
      method: 'DELETE',
      headers: await this.headers(),
      body: body ? JSON.stringify(body) : undefined,
    });
    if (res.status === 204) return;
    if (!res.ok) {
      const text = await res.text().catch(() => '');
      throw new Error(`DELETE ${path} → HTTP ${res.status}: ${text.slice(0, 200)}`);
    }
    const json = await res.json();
    if (!json.success) throw new Error(`DELETE ${path} failed: ${json.error ?? 'unknown'}`);
  }

  private async rawPost<T>(path: string, body: unknown): Promise<T> {
    const res = await fetch(`${API_BASE}${path}`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(body),
    });
    if (!res.ok) {
      const text = await res.text().catch(() => '');
      throw new Error(`POST ${path} → HTTP ${res.status}: ${text.slice(0, 200)}`);
    }
    const json = await res.json();
    if (!json.success) throw new Error(`POST ${path} failed: ${json.error ?? 'unknown'}`);
    return json as T;
  }
}
