import { Component, computed, inject, signal } from '@angular/core';
import { NgIcon } from '@ng-icons/core';
import { I18nService } from '@core/i18n.service';
import type { SavedConnection, Stack } from '@shared/types';
import { ConnectionsService } from '@core/connections.service';
import { ConfirmDialog } from '../dialogs/confirm-dialog';
import { PromptDialog } from '../dialogs/prompt-dialog';
import { DialogsService } from '@core/dialogs.service';
import { blockNativeContextMenu, IS_MAC_CHROME } from '@core/platform';
import { RpcService } from '@core/rpc.service';
import { SettingsService } from '@core/settings.service';
import { ShortcutsService } from '@core/shortcuts.service';
import { Toasts } from '../toasts/toasts';

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

function toDraft(c: SavedConnection): Draft {
  return {
    id: c.id,
    name: c.name,
    stackId: c.stackId,
    host: c.host,
    port: c.port,
    username: c.username,
    // agent auth only exists on ~/.ssh/config hosts, which never reach this form
    authKind: c.auth.kind === 'password' ? 'password' : 'key',
    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 ?? '',
    localDir: c.localDir ?? '',
  };
}

function fromDraft(d: Draft): SavedConnection {
  return {
    id: d.id,
    name: d.name.trim() || `${d.username}@${d.host}`,
    stackId: d.stackId,
    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,
    localDir: d.localDir.trim() || null,
  };
}

/**
 * Root component of the connection-manager window (__APP_MODE === 'manager').
 * Modal to the main window (enforced bun-side); connect/open-stack requests
 * are executed by the MAIN window — this window never touches panels.
 */
@Component({
  selector: 'app-root',
  imports: [NgIcon, ConfirmDialog, PromptDialog, Toasts],
  templateUrl: './connection-manager.html',
  host: {
    '(window:keydown.escape)': 'onEscape()',
    '(window:keydown)': 'onWindowKeydown($event)',
    '(window:contextmenu)': 'blockContextMenu($event)',
  },
})
export class ConnectionManager {
  readonly i18n = inject(I18nService);
  readonly store = inject(ConnectionsService);
  readonly dialogs = inject(DialogsService);
  readonly isMacChrome = IS_MAC_CHROME;
  private readonly rpc = inject(RpcService);
  // injected for its side effects: fetches settings and applies theme/accent/
  // text-size data attributes to this window's document root
  private readonly settings = inject(SettingsService);
  private readonly shortcuts = inject(ShortcutsService);

  readonly draft = signal<Draft | null>(null);
  readonly busy = signal(false);
  readonly importing = signal(false);
  /** The More… section (local directory) in the edit form. */
  readonly moreOpen = signal(false);
  /** Connection id being dragged between stacks. */
  readonly draggedId = signal<string | null>(null);
  /** Highlighted drop target: a stack id, 'loose', or null. */
  readonly dropTarget = signal<string | null>(null);

  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.moreOpen.set(false);
    this.draft.set({
      id: '',
      name: '',
      stackId: null,
      host: '',
      port: 22,
      username: 'root',
      authKind: 'password',
      password: '',
      privateKeyPath: '',
      passphrase: '',
      initialPath: '',
      localDir: '',
    });
  }

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

  close(): void {
    void this.rpc.request.managerClose({});
  }

  onEscape(): void {
    // in-window dialogs (confirm/prompt) handle their own Escape first
    if (!this.dialogs.anyOpen) this.close();
  }

  /** Any-window shortcuts (interface scale). Escape has its own binding above. */
  onWindowKeydown(event: KeyboardEvent): void {
    const match = this.shortcuts.resolve(event, 'manager');
    if (!match || this.shortcuts.isTypingTarget(event)) return;
    event.preventDefault();
    if (match.id === 'scale-up') this.settings.setUiScale(this.settings.uiScale() + 0.1);
    else if (match.id === 'scale-down') this.settings.setUiScale(this.settings.uiScale() - 0.1);
    else if (match.id === 'scale-reset') this.settings.setUiScale(1);
  }

  blockContextMenu(event: Event): void {
    blockNativeContextMenu(event);
  }

  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> {
    if (!this.draft()) return;
    this.busy.set(true);
    try {
      const id = await this.save();
      if (!id) return;
      // the main window connects (and this window closes); a failed connect
      // surfaces as an error there
      await this.rpc.request.managerConnect({ id });
    } finally {
      this.busy.set(false);
    }
  }

  deleteCurrent(): void {
    const d = this.draft();
    if (!d?.id) {
      this.draft.set(null);
      return;
    }
    this.dialogs.confirm.set({
      title: this.i18n.t('connMgr.deleteConnectionTitle'),
      body: this.i18n.t('connMgr.deleteConnectionBody', { name: d.name || d.host }),
      confirmLabel: this.i18n.t('common.delete'),
      destructive: true,
      onConfirm: async () => {
        await this.store.remove(d.id);
        this.draft.set(null);
      },
    });
  }

  async pickKeyFile(): Promise<void> {
    const res = await this.rpc.request.pickKeyFile({});
    if (res.ok && res.path) this.patch('privateKeyPath', res.path);
  }

  async importWinScp(): Promise<void> {
    this.importing.set(true);
    try {
      await this.store.importWinScp();
    } finally {
      this.importing.set(false);
    }
  }

  // ---- stacks ----

  openStack(stackId: string): void {
    // opened as tabs in the main window; bun closes this window after
    void this.rpc.request.managerOpenStack({ id: stackId });
  }

  toggleStack(stack: Stack): void {
    void this.store.upsertStack({ ...stack, collapsed: !stack.collapsed });
  }

  newStack(): void {
    this.dialogs.prompt.set({
      title: this.i18n.t('connMgr.newStackTitle'),
      placeholder: this.i18n.t('connMgr.newStackPrompt'),
      confirmLabel: this.i18n.t('fileActions.createConfirm'),
      onConfirm: (name) => void this.store.upsertStack({ id: '', name }),
    });
  }

  renameStack(stack: Stack): void {
    this.dialogs.prompt.set({
      title: this.i18n.t('connMgr.renameStackTitle'),
      initial: stack.name,
      confirmLabel: this.i18n.t('connMgr.renameStack'),
      onConfirm: (name) => void this.store.upsertStack({ ...stack, name }),
    });
  }

  deleteStack(stack: Stack): void {
    this.dialogs.confirm.set({
      title: this.i18n.t('connMgr.deleteStackTitle'),
      body: this.i18n.t('connMgr.deleteStackBody', { name: stack.name }),
      confirmLabel: this.i18n.t('common.delete'),
      destructive: true,
      onConfirm: () => void this.store.removeStack(stack.id),
    });
  }

  // ---- drag & drop (move a connection between stacks / loose) ----

  onDragStart(event: DragEvent, connection: SavedConnection): void {
    this.draggedId.set(connection.id);
    event.dataTransfer?.setData('text/plain', connection.id);
    if (event.dataTransfer) event.dataTransfer.effectAllowed = 'move';
  }

  onDragOver(event: DragEvent, target: string): void {
    if (!this.draggedId()) return;
    event.preventDefault();
    this.dropTarget.set(target);
  }

  onDrop(event: DragEvent, stackId: string | null): void {
    event.preventDefault();
    const id = this.draggedId();
    this.draggedId.set(null);
    this.dropTarget.set(null);
    const connection = this.store.connections().find((c) => c.id === id);
    if (!connection || connection.stackId === stackId) return;
    void this.store.upsert({ ...connection, stackId });
  }

  onDragEnd(): void {
    this.draggedId.set(null);
    this.dropTarget.set(null);
  }
}