import { Injectable, inject } from '@angular/core';
import type { FileEntry } from '@shared/types';
import { ContextMenuService } from './context-menu.service';
import { DialogsService } from './dialogs.service';
import { joinPath } from './format';
import { type PanelState, type Side } from './panels.service';
import { IS_WINDOWS } from './platform';
import { RpcService } from './rpc.service';
import { SettingsService } from './settings.service';
import { I18nService } from './i18n.service';
import { ToastService } from './toast.service';

/** The row (or empty space) the user last right-clicked; ctx-* actions apply here. */
export interface MenuTarget {
  side: Side;
  panel: PanelState;
  entry: FileEntry | null;
}

/**
 * File operations invoked from a panel's toolbar / keyboard. They act on the
 * GIVEN panel: on the selection if there is one, else on the cursor row.
 */
@Injectable({ providedIn: 'root' })
export class FileActionsService {
  private readonly i18n = inject(I18nService);
  private readonly rpc = inject(RpcService);
  private readonly toast = inject(ToastService);
  private readonly dialogs = inject(DialogsService);
  private readonly menu = inject(ContextMenuService);
  private readonly settings = inject(SettingsService);

  menuTarget: MenuTarget | null = null;

  /** Right-click entry point: remember the target, then open the menu on it. */
  openContextMenu(event: MouseEvent, target: MenuTarget): void {
    this.menuTarget = target;
    const { panel, entry } = target;
    this.menu.open(
      event,
      this.menu.rowItems({
        path: entry?.path ?? panel.cwd(),
        name: entry?.name ?? '',
        type: entry?.type ?? 'dir',
        isLocal: panel.sessionId() === 'local',
        hasEntry: !!entry,
      }),
    );
  }

  async trash(panel: PanelState, entry: FileEntry): Promise<void> {
    const res = await this.rpc.request.moveToTrash({ path: entry.path });
    if (!res.ok) this.toast.error(res.error);
    else this.toast.info(this.i18n.t('toasts.movedToTrash', { name: entry.name }));
    await panel.refresh();
  }

  /** Selection if non-empty, else the cursor entry. Never the ".." parent row. */
  targets(panel: PanelState): FileEntry[] {
    const selected = panel.selectedEntries();
    if (selected.length) return selected;
    const atCursor = panel.sorted()[panel.cursor()];
    return atCursor && atCursor.name !== '..' ? [atCursor] : [];
  }

  mkdir(panel: PanelState): void {
    this.dialogs.prompt.set({
      title: this.i18n.t('fileActions.newFolderTitle'),
      placeholder: this.i18n.t('fileActions.newFolderPlaceholder'),
      confirmLabel: this.i18n.t('fileActions.createConfirm'),
      onConfirm: async (name) => {
        const res = await this.rpc.request.mkdir({
          sessionId: panel.sessionId(),
          path: joinPath(panel.cwd(), name),
        });
        if (!res.ok) this.toast.error(res.error);
        await panel.refresh();
      },
    });
  }

  createFile(panel: PanelState): void {
    this.dialogs.prompt.set({
      title: this.i18n.t('fileActions.newFileTitle'),
      placeholder: this.i18n.t('fileActions.newFilePlaceholder'),
      confirmLabel: this.i18n.t('fileActions.createConfirm'),
      onConfirm: async (name) => {
        const res = await this.rpc.request.createFile({
          sessionId: panel.sessionId(),
          path: joinPath(panel.cwd(), name),
        });
        if (!res.ok) this.toast.error(res.error);
        await panel.refresh();
      },
    });
  }

  /** Open the cursor file in the built-in editor or the configured external app. */
  async edit(panel: PanelState): Promise<void> {
    const entry = panel.sorted()[panel.cursor()];
    if (!entry || entry.type !== 'file' || entry.name === '..') return;

    if (this.settings.editor() === 'custom') {
      const res = await this.rpc.request.editExternal({
        sessionId: panel.sessionId(),
        path: entry.path,
      });
      if (!res.ok) {
        this.toast.error(res.error);
      } else if (res.watching) {
        this.toast.info(this.i18n.t('toasts.editingExternal', { name: entry.name }));
      }
      return;
    }

    // built-in editor: its own native window (reads the file itself)
    const res = await this.rpc.request.openEditor({
      sessionId: panel.sessionId(),
      path: entry.path,
      name: entry.name,
      sessionTitle: panel.title(),
    });
    if (!res.ok) this.toast.error(res.error);
  }

  rename(panel: PanelState): void {
    const entry = panel.sorted()[panel.cursor()];
    if (!entry || entry.name === '..') return;
    this.dialogs.prompt.set({
      title: this.i18n.t('fileActions.renameTitle', { name: entry.name }),
      initial: entry.name,
      confirmLabel: this.i18n.t('fileActions.renameConfirm'),
      onConfirm: async (name) => {
        if (name === entry.name) return;
        const res = await this.rpc.request.rename({
          sessionId: panel.sessionId(),
          oldPath: entry.path,
          newPath: joinPath(panel.cwd(), name),
        });
        if (!res.ok) this.toast.error(res.error);
        await panel.refresh();
      },
    });
  }

  delete(panel: PanelState): void {
    const targets = this.targets(panel);
    if (!targets.length) return;
    const what =
      targets.length === 1
        ? `"${targets[0].name}"`
        : this.i18n.t('fileActions.itemsCount', { count: targets.length });
    this.dialogs.confirm.set({
      title: this.i18n.t('fileActions.deleteTitle'),
      body: this.i18n.t('fileActions.deleteBody', { what }),
      confirmLabel: this.i18n.t('fileActions.deleteConfirm'),
      destructive: true,
      onConfirm: async () => {
        const res = await this.rpc.request.deleteEntries({
          sessionId: panel.sessionId(),
          entries: targets.map(({ path, type }) => ({ path, type })),
        });
        if (!res.ok) this.toast.error(res.error);
        await panel.refresh();
      },
    });
  }

  chmod(panel: PanelState): void {
    // Windows local chmod only flips the read-only bit — don't pretend
    if (IS_WINDOWS && panel.sessionId() === 'local') return;
    const targets = this.targets(panel);
    if (!targets.length) return;
    this.dialogs.chmod.set({
      targets: targets.map((t) => t.name),
      initialMode: targets[0].mode,
      onConfirm: async (mode) => {
        const res = await this.rpc.request.chmod({
          sessionId: panel.sessionId(),
          paths: targets.map((t) => t.path),
          mode,
        });
        if (!res.ok) this.toast.error(res.error);
        await panel.refresh();
      },
    });
  }
}