import { API_BASE_URL } from "@config/config_frontend";

export interface DashboardUser {
  id: number;
  email: string;
  name: string;
  position?: string | null;
  department?: string | null;
  phone?: string | null;
  company_id?: number | null;
  company_name?: string | null;
  role: "SYSTEM_ADMIN" | "ADMIN" | "USER";
  is_master: boolean;
  status: string;
}

export interface ProjectItem {
  id: string;
  name: string;
  region?: string | null;
  status?: string | null;
  owner_name?: string | null;
  workflow_stage: number;
  progress_percent: number;
  updated_at?: string | null;
}

export interface CompanyInfo {
  id: number;
  name: string;
  business_registration_number?: string | null;
  business_address?: string | null;
  business_owner?: string | null;
  business_status?: string | null;
  user_count?: number;
  project_count?: number;
}

export interface Member {
  id: number;
  email: string;
  name: string;
  position?: string | null;
  department?: string | null;
  role: string;
  status: string;
}

export interface JoinRequest {
  id: number;
  user_id: number;
  company_id: number;
  user_email: string;
  user_name?: string | null;
  company_name?: string | null;
  requested_at: string;
  status: string;
}

export interface AuditLog {
  id: number;
  user_id: number;
  email?: string | null;
  action: string;
  resource_type?: string | null;
  resource_id?: number | null;
  timestamp: string;
}

export interface ResourceData {
  current: {
    cpu_usage_percent: number | null;
    memory_usage_percent: number | null;
    disk_usage_percent: number | null;
    active_user_count: number;
    active_project_count: number;
    total_storage_mb: number;
  };
  history: unknown[];
  stats: ResourceData["current"];
}

export interface UpdateUserRequest {
  name: string;
  position?: string | null;
  department?: string | null;
  phone?: string | null;
}

export interface CreateCompanyRequest {
  name: string;
  business_registration_number: string;
  business_address?: string | null;
  business_owner?: string | null;
}

async function request<T>(path: string, init: RequestInit = {}): Promise<T> {
  const response = await fetch(`${API_BASE_URL}${path}`, {
    credentials: "include",
    headers: { "Content-Type": "application/json", ...(init.headers ?? {}) },
    ...init,
  });
  const data = (await response.json()) as { detail?: string } & T;
  if (!response.ok) throw new Error(data.detail ?? "Request failed");
  return data;
}

const body = (value: object): string => JSON.stringify(value);

export async function fetchDashboardMe(): Promise<DashboardUser> {
  const data = await request<{ user: DashboardUser }>("/dashboard/me");
  return data.user;
}

export async function updateUserProfile(payload: UpdateUserRequest): Promise<DashboardUser> {
  const data = await request<{ user: DashboardUser }>("/dashboard/me", {
    method: "PATCH",
    body: body(payload),
  });
  return data.user;
}

export async function fetchUserProjects(): Promise<ProjectItem[]> {
  const data = await request<{ projects: ProjectItem[] }>("/dashboard/user/projects");
  return data.projects;
}

export async function fetchUserCompany(): Promise<CompanyInfo | null> {
  const data = await request<{ company: CompanyInfo | null }>("/dashboard/user/company");
  return data.company;
}

export async function searchCompanies(query: string): Promise<CompanyInfo[]> {
  const data = await request<{ companies: CompanyInfo[] }>(
    `/dashboard/user/companies?q=${encodeURIComponent(query)}`,
  );
  return data.companies;
}

export function createCompany(payload: CreateCompanyRequest): Promise<unknown> {
  return request("/dashboard/user/company/create", { method: "POST", body: body(payload) });
}

export function joinCompany(companyId: number): Promise<unknown> {
  return request("/dashboard/user/company/join", {
    method: "POST",
    body: body({ company_id: companyId }),
  });
}

export async function fetchCompanyMembers(): Promise<Member[]> {
  const data = await request<{ members: Member[] }>("/dashboard/admin/members");
  return data.members;
}

export function addCompanyMember(email: string): Promise<unknown> {
  return request("/dashboard/admin/members", { method: "POST", body: body({ email }) });
}

export function removeCompanyMember(userId: number): Promise<unknown> {
  return request(`/dashboard/admin/members/${userId}`, { method: "DELETE" });
}

export async function fetchCompanyJoinRequests(): Promise<JoinRequest[]> {
  const data = await request<{ requests: JoinRequest[] }>("/dashboard/admin/join-requests");
  return data.requests;
}

export function processJoinRequest(
  requestId: number,
  action: "APPROVE" | "REJECT",
): Promise<unknown> {
  return request(`/dashboard/admin/join-requests/${requestId}`, {
    method: "PATCH",
    body: body({ action }),
  });
}

export async function fetchCompanyProjects(): Promise<ProjectItem[]> {
  const data = await request<{ projects: ProjectItem[] }>("/dashboard/admin/projects");
  return data.projects;
}

export async function fetchAllCompanies(): Promise<CompanyInfo[]> {
  const data = await request<{ companies: CompanyInfo[] }>("/dashboard/admin/companies");
  return data.companies;
}

export async function fetchAllUsers(): Promise<DashboardUser[]> {
  const data = await request<{ users: DashboardUser[] }>("/dashboard/admin/users");
  return data.users;
}

export function changeUserRole(userId: number, role: string): Promise<unknown> {
  return request(`/dashboard/admin/users/${userId}/role`, {
    method: "PATCH",
    body: body({ role }),
  });
}

export function assignUserToCompany(userId: number, companyId: number | null): Promise<unknown> {
  return request(`/dashboard/admin/users/${userId}/company`, {
    method: "PATCH",
    body: body({ company_id: companyId }),
  });
}

export async function fetchAllJoinRequests(): Promise<JoinRequest[]> {
  const data = await request<{ requests: JoinRequest[] }>("/dashboard/admin/join-requests-all");
  return data.requests;
}

export function systemApproveJoinRequest(requestId: number): Promise<unknown> {
  return request(`/dashboard/admin/join-requests/${requestId}/approve`, { method: "PATCH" });
}

export async function fetchAuditLogs(): Promise<AuditLog[]> {
  const data = await request<{ items: AuditLog[] }>("/dashboard/admin/audit-logs");
  return data.items;
}

export async function fetchSystemResources(period = "24h"): Promise<ResourceData> {
  return request<ResourceData>(`/dashboard/admin/resources?period=${encodeURIComponent(period)}`);
}