import { Injectable, inject } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Observable } from 'rxjs';
import { Attachment, BlacklistEntry, Contact, Draft, Folder, Mailbox, MailboxCreated, Message, Profile, ServerConfig } from './models';

/** The mail server REST API (same origin, /api). */
@Injectable({ providedIn: 'root' })
export class ApiService {
  private http = inject(HttpClient);

  config(): Observable<ServerConfig> { return this.http.get<ServerConfig>('/api/config'); }

  // profile
  me(): Observable<Profile> { return this.http.get<Profile>('/api/me'); }
  updateMe(displayName: string): Observable<Profile> { return this.http.put<Profile>('/api/me', { displayName }); }
  changePassword(currentPassword: string, newPassword: string): Observable<unknown> {
    return this.http.put('/api/me/password', { currentPassword, newPassword });
  }

  // mailboxes — administrators only
  mailboxes(): Observable<Mailbox[]> { return this.http.get<Mailbox[]>('/api/admin/mailboxes'); }
  createMailbox(email: string, displayName: string, password: string): Observable<MailboxCreated> {
    return this.http.post<MailboxCreated>('/api/admin/mailboxes', { email, displayName, password });
  }
  newMailboxPassword(id: number): Observable<MailboxCreated> {
    return this.http.post<MailboxCreated>(`/api/admin/mailboxes/${id}/password`, {});
  }
  setMailboxActive(id: number, active: boolean): Observable<Mailbox> {
    return this.http.put<Mailbox>(`/api/admin/mailboxes/${id}/active`, { active });
  }

  // folders
  folders(): Observable<Folder[]> { return this.http.get<Folder[]>('/api/folders'); }
  createFolder(name: string): Observable<Folder> { return this.http.post<Folder>('/api/folders', { name }); }
  renameFolder(id: number, name: string): Observable<unknown> { return this.http.put(`/api/folders/${id}`, { name }); }
  deleteFolder(id: number): Observable<unknown> { return this.http.delete(`/api/folders/${id}`); }
  emptyFolder(id: number): Observable<{ deleted: number }> {
    return this.http.delete<{ deleted: number }>(`/api/folders/${id}/messages`);
  }

  // messages
  messages(folderId: number): Observable<Message[]> {
    return this.http.get<Message[]>('/api/messages', { params: { folderId } });
  }
  search(folderId: number, keyword: string): Observable<Message[]> {
    return this.http.get<Message[]>('/api/messages/search', { params: { folderId, keyword } });
  }
  message(id: number): Observable<Message> { return this.http.get<Message>(`/api/messages/${id}`); }
  updateMessage(id: number, change: { read?: boolean; flagged?: boolean; folderId?: number }): Observable<Message> {
    return this.http.patch<Message>(`/api/messages/${id}`, change);
  }
  deleteMessage(id: number): Observable<unknown> { return this.http.delete(`/api/messages/${id}`); }

  // compose
  createDraft(draft: Draft): Observable<Message> { return this.http.post<Message>('/api/drafts', draft); }
  updateDraft(id: number, draft: Draft): Observable<Message> { return this.http.put<Message>(`/api/drafts/${id}`, draft); }
  send(draft: Draft, draftId: number | null): Observable<Message> {
    return this.http.post<Message>('/api/send', { ...draft, draftId });
  }

  // attachments
  attachments(messageId: number): Observable<Attachment[]> {
    return this.http.get<Attachment[]>(`/api/messages/${messageId}/attachments`);
  }
  upload(messageId: number, file: File): Observable<Attachment> {
    const form = new FormData();
    form.append('file', file, file.name);
    return this.http.post<Attachment>(`/api/messages/${messageId}/attachments`, form);
  }
  deleteAttachment(id: number): Observable<unknown> { return this.http.delete(`/api/attachments/${id}`); }
  download(id: number): Observable<Blob> {
    return this.http.get(`/api/attachments/${id}/download`, { responseType: 'blob' });
  }

  // contacts
  contacts(): Observable<Contact[]> { return this.http.get<Contact[]>('/api/contacts'); }
  addContact(contact: Contact): Observable<unknown> { return this.http.post('/api/contacts', contact); }
  updateContact(id: number, contact: Contact): Observable<unknown> { return this.http.put(`/api/contacts/${id}`, contact); }
  deleteContact(id: number): Observable<unknown> { return this.http.delete(`/api/contacts/${id}`); }

  // blacklist
  blacklist(): Observable<BlacklistEntry[]> { return this.http.get<BlacklistEntry[]>('/api/spam/blacklist'); }
  block(senderEmail: string, reason: string): Observable<unknown> {
    return this.http.post('/api/spam/blacklist', { senderEmail, reason });
  }
  unblock(senderEmail: string): Observable<unknown> {
    return this.http.delete('/api/spam/blacklist', { params: { senderEmail } });
  }
}