import { RoleData } from "./role.entity";
import { PermissionData } from "./permission.entity";
import crypto from 'crypto';

export class UserData {
    private constructor(
    public readonly id: string,
    public authentikId: string | null,
    public username: string,
        public email: string,
    public roles: RoleData[],
    public permissions: PermissionData[],
    public isActive: boolean,
    public deletedAt: Date | null,
    public lastSeenAt: Date | null,
    public storageQuota: number,
    public storageUsed: number,
  ) {}

    //#region Create

    static create(data: {
        username: string;
    email: string;
    authentikId?: string | null;
    storageQuota?: number;
    storageUsed?: number;
  }): UserData {
    const quota = data.storageQuota !== undefined ? data.storageQuota : 10737418240; // 10 GB
    const used = data.storageUsed !== undefined ? data.storageUsed : 0;
    return new UserData(
      crypto.randomUUID(),
      data.authentikId || null,
      data.username,
      data.email,
            [],
      [],
      true,
      null,
      null,
      quota,
      used,
    );
  }

  //#endregion

  //#region Read

  hasRole(roleId: string) : boolean {
    return this.roles.some(x => x.id.toLowerCase() === roleId.toLowerCase())
  }

  assignRole(roleData : RoleData) : void {
    if (this.hasRole(roleData.id))
      throw new Error("Role Sudah dimiliki.");

    this.roles.push(roleData);
  }

    hasPermissions(permissionId : string) : boolean {
    return this.permissions.some(x => x.id.toLowerCase() === permissionId.toLowerCase())
  }

  hasPermission(permission: string) : boolean {
    const byPerm = this.permissions.some(x => x.id.toLowerCase() === permission.toLowerCase() || x.name.toLowerCase() === permission.toLowerCase());
    if (byPerm) return true;

    // check roles
    return this.roles.some(r => r.permissions.some(p => p.id.toLowerCase() === permission.toLowerCase() || p.name.toLowerCase() === permission.toLowerCase()));
  }

  assignPermission(permissionData : PermissionData) : void {
    if (this.hasPermissions(permissionData.id))
      throw new Error("Permission sudah dimiliki.")

    this.permissions.push(permissionData);
  }

  //#endregion

  //#region Update
    changeEmail(email: string) {
    this.email = email;
  }

  changeUsername(username: string) {
    this.username = username;
  }

  touchLastSeen() {
    this.lastSeenAt = new Date();
  }

    enable() {
    this.isActive = true;
  }

  disable() {
    this.isActive = false;
  }
  //#endregion

  //#region Delete
  softDelete() {
    this.deletedAt = new Date();
    this.isActive = false;
  }

  restoreInstance() {
    this.deletedAt = null;
  }
  //#endregion

    public static restore(props: {
      id: string;
      authentikId?: string | null;
      username: string;
            email: string;
      roles?: RoleData[];
      permissions?: PermissionData[];
      isActive?: boolean;
      deletedAt?: Date | null;
      lastSeenAt?: Date | null;
      storageQuota?: number | null;
      storageUsed?: number | null;
  }): UserData {

      return new UserData(
          props.id,
          props.authentikId || null,
          props.username,
                    props.email,
          props.roles || [],
          props.permissions || [],
          props.isActive !== undefined ? props.isActive : true,
          props.deletedAt || null,
          props.lastSeenAt || null,
          props.storageQuota !== undefined && props.storageQuota !== null ? props.storageQuota : 10737418240,
          props.storageUsed !== undefined && props.storageUsed !== null ? props.storageUsed : 0,
      );
  }

  removeRole(roleId: string) {
    const idx = this.roles.findIndex(r => r.id.toLowerCase() === roleId.toLowerCase());
    if (idx === -1) throw new Error('Role tidak ditemukan pada user.');
    this.roles.splice(idx, 1);
  }

    removePermission(permissionId: string) {
    const idx = this.permissions.findIndex(p => p.id.toLowerCase() === permissionId.toLowerCase());
    if (idx === -1) throw new Error('Permission tidak ditemukan pada user.');
    this.permissions.splice(idx, 1);
  }

  // Storage helpers
  setStorageQuota(bytes: number) {
    if (bytes < 0) throw new Error('storageQuota must be >= 0');
    if (this.storageUsed > bytes) throw new Error('storageQuota cannot be less than storageUsed');
    this.storageQuota = bytes;
  }

  setStorageUsed(bytes: number) {
    if (bytes < 0) throw new Error('storageUsed must be >= 0');
    if (bytes > this.storageQuota) throw new Error('storageUsed cannot exceed storageQuota');
    this.storageUsed = bytes;
  }

  // Response helper for API
  toResponse() {
    const remaining = this.storageQuota - this.storageUsed;
    const usagePercentage = this.storageQuota > 0 ? Math.round((this.storageUsed / this.storageQuota) * 100) : 0;

    return {
      id: this.id,
      authentikId: this.authentikId,
      username: this.username,
      email: this.email,
      roles: this.roles,
      permissions: this.permissions,
      isActive: this.isActive,
      deletedAt: this.deletedAt,
      lastSeenAt: this.lastSeenAt,
      storage: {
        quota: this.storageQuota,
        used: this.storageUsed,
        remaining,
        usagePercentage,
      },
    };
  }
}