import { Component, computed, inject, signal } from '@angular/core';
import { NgIcon } from '@ng-icons/core';
import type { SavedConnection } from '@shared/types';
import { ConnectionsService } from '../connections.service';
import { DialogsService } from '../dialogs.service';
import { PanelsService } from '../panels.service';

interface Draft {
  id: string;
  name: string;
  folderId: string | null;
  host: string;
  port: number;
  username: string;
  authKind: 'password' | 'key';
  password: string;
  privateKeyPath: string;
  passphrase: string;
  initialPath: string;
}

function toDraft(c: SavedConnection): Draft {
  return {
    id: c.id,
    name: c.name,
    folderId: c.folderId,
    host: c.host,
    port: c.port,
    username: c.username,
    authKind: c.auth.kind,
    password: c.auth.kind === 'password' ? c.auth.password : '',
    privateKeyPath: c.auth.kind === 'key' ? c.auth.privateKeyPath : '',
    passphrase: c.auth.kind === 'key' ? (c.auth.passphrase ?? '') : '',
    initialPath: c.initialPath ?? '',
  };
}

function fromDraft(d: Draft): SavedConnection {
  return {
    id: d.id,
    name: d.name.trim() || `${d.username}@${d.host}`,
    folderId: d.folderId,
    host: d.host.trim(),
    port: d.port || 22,
    username: d.username.trim(),
    auth:
      d.authKind === 'password'
        ? { kind: 'password', password: d.password }
        : {
            kind: 'key',
            privateKeyPath: d.privateKeyPath.trim(),
            ...(d.passphrase ? { passphrase: d.passphrase } : {}),
          },
    initialPath: d.initialPath.trim() || null,
  };
}

@Component({
  selector: 'app-connection-manager',
  imports: [NgIcon],
  templateUrl: './connection-manager.html',
})
export class ConnectionManager {
  readonly store = inject(ConnectionsService);
  readonly dialogs = inject(DialogsService);
  readonly panels = inject(PanelsService);

  readonly draft = signal<Draft | null>(null);
  readonly busy = signal(false);
  readonly valid = computed(() => {
    const d = this.draft();
    if (!d) return false;
    if (!d.host.trim() || !d.username.trim()) return false;
    if (d.authKind === 'key' && !d.privateKeyPath.trim()) return false;
    return true;
  });

  patch<K extends keyof Draft>(key: K, value: Draft[K]): void {
    this.draft.update((d) => (d ? { ...d, [key]: value } : d));
  }

  newConnection(): void {
    this.draft.set({
      id: '',
      name: '',
      folderId: null,
      host: '',
      port: 22,
      username: 'root',
      authKind: 'password',
      password: '',
      privateKeyPath: '',
      passphrase: '',
      initialPath: '',
    });
  }

  edit(connection: SavedConnection): void {
    this.draft.set(toDraft(connection));
  }

  close(): void {
    this.dialogs.manager.set(false);
    this.panels.refocus();
  }

  async save(): Promise<string | null> {
    const d = this.draft();
    if (!d || !this.valid()) return null;
    const id = await this.store.upsert(fromDraft(d));
    if (id) this.patch('id', id);
    return id;
  }

  async saveAndConnect(): Promise<void> {
    const d = this.draft();
    if (!d) return;
    this.busy.set(true);
    try {
      const id = await this.save();
      if (!id) return;
      const connection = fromDraft({ ...d, id });
      const ok = await this.panels.connectPanel(
        this.panels.activeSide(),
        connection,
        connection.name,
      );
      if (ok) this.close();
    } finally {
      this.busy.set(false);
    }
  }

  deleteCurrent(): void {
    const d = this.draft();
    if (!d?.id) {
      this.draft.set(null);
      return;
    }
    this.dialogs.confirm.set({
      title: 'Delete connection',
      body: `Delete "${d.name || d.host}"?`,
      confirmLabel: 'Delete',
      destructive: true,
      onConfirm: async () => {
        await this.store.remove(d.id);
        this.draft.set(null);
      },
    });
  }

  newFolder(): void {
    this.dialogs.prompt.set({
      title: 'New folder',
      placeholder: 'folder name',
      confirmLabel: 'Create',
      onConfirm: (name) => void this.store.upsertFolder({ id: '', name }),
    });
  }

  deleteFolder(id: string, name: string): void {
    this.dialogs.confirm.set({
      title: 'Delete folder',
      body: `Delete folder "${name}"? Its connections move to the root.`,
      confirmLabel: 'Delete',
      destructive: true,
      onConfirm: () => void this.store.removeFolder(id),
    });
  }
}