import { render, screen, fireEvent, waitFor, act, within } from '@testing-library/react';
import { describe, it, expect, vi } from 'vitest';
import React from 'react';
import { EmailComposer } from '../email-composer';
import { useAuthStore } from '@/stores/auth-store';

// A reply draft re-opens in compose mode, where the composer used to have
// nothing to rebuild In-Reply-To / References from: every later save (and the
// send) dropped the reply out of its thread.

// ─── Heavy component mocks (mirrors composer-close-guard.test.tsx) ──────────

vi.mock('@/components/email/rich-text-editor', () => ({
  RichTextEditor: () => React.createElement('div', { 'data-testid': 'rich-text-editor' }),
}));

vi.mock('@/components/plugins/plugin-slot', () => ({ PluginSlot: () => null }));
vi.mock('@/components/identity/sub-address-helper', () => ({ SubAddressHelper: () => null }));
vi.mock('@/components/templates/template-picker', () => ({ TemplatePicker: () => null }));
vi.mock('@/components/templates/template-form', () => ({ TemplateForm: () => null }));
vi.mock('@/components/files/file-preview-modal', () => ({ FilePreviewModal: () => null }));
vi.mock('@/hooks/use-focus-trap', () => ({
  useFocusTrap: () => ({ current: null }),
}));
vi.mock('@/hooks/use-pro-multi-account-identities', () => ({
  useProMultiAccountIdentities: () => ({ enabled: false, groups: [], allIdentities: [] }),
  stripCrossAccountIdentityPrefix: (id: string) => ({ localAccountId: null, rawId: id }),
}));

// ─── Store mocks ──────────────────────────────────────────────────────────────

vi.mock('@/stores/auth-store', () => {
  const state = {
    client: null,
    identities: [],
    primaryIdentity: null,
    isAuthenticated: false,
    isDemoMode: false,
    activeAccountId: null,
    connectionLost: false,
    getClientForAccount: () => undefined,
    getAllConnectedClients: () => new Map(),
    syncIdentities: () => {},
    refreshIdentities: async () => {},
  };
  const hook = (sel?: (s: typeof state) => unknown) =>
    typeof sel === 'function' ? sel(state) : state;
  hook.getState = () => state;
  hook.setState = (p: Partial<typeof state>) => Object.assign(state, p);
  return { useAuthStore: hook };
});

vi.mock('@/stores/identity-store', () => {
  const state = {
    identities: [{ id: 'id-me', email: 'me@example.com', name: 'Me' }],
    defaultIdentityId: 'id-me',
  };
  const hook = (sel?: (s: typeof state) => unknown) =>
    typeof sel === 'function' ? sel(state) : state;
  hook.getState = () => state;
  hook.setState = (p: Partial<typeof state>) => Object.assign(state, p);
  return { useIdentityStore: hook };
});

vi.mock('@/stores/account-store', () => {
  const state = { accounts: [], getAccountById: () => undefined };
  const hook = (sel?: (s: typeof state) => unknown) =>
    typeof sel === 'function' ? sel(state) : state;
  hook.getState = () => state;
  hook.setState = (p: Partial<typeof state>) => Object.assign(state, p);
  return { useAccountStore: hook };
});

vi.mock('@/stores/email-store', () => {
  const state = {
    draftSaveEnabled: false,
    sendRawEmail: async () => ({ sent: true }),
  };
  const hook = (sel?: (s: typeof state) => unknown) =>
    typeof sel === 'function' ? sel(state) : state;
  hook.getState = () => state;
  hook.setState = (p: Partial<typeof state>) => Object.assign(state, p);
  return { useEmailStore: hook };
});

const updateSetting = vi.fn();

vi.mock('@/stores/settings-store', () => {
  const state = {
    timeFormat: '24h',
    plainTextMode: false,
    subAddressDelimiter: '+',
    autoSelectReplyIdentity: true,
    attachmentReminderEnabled: false,
    attachmentReminderKeywords: [],
    emptySubjectWarningEnabled: true,
    sendDelaySeconds: 0,
    signaturePosition: 'above_quote',
    signatureSeparatorEnabled: false,
    requestReadReceiptDefault: false,
    addTrustedSender: () => {},
    trustedSendersAddressBook: null,
    updateSetting: (...args: unknown[]) => updateSetting(...args),
  };
  const hook = (sel?: (s: typeof state) => unknown) =>
    typeof sel === 'function' ? sel(state) : state;
  hook.getState = () => state;
  hook.setState = (p: Partial<typeof state>) => Object.assign(state, p);
  return { useSettingsStore: hook };
});

vi.mock('@/stores/contact-store', () => {
  const state = {
    contacts: [],
    getAutocomplete: async () => [],
    addToTrustedSendersBook: async () => {},
  };
  const hook = (sel?: (s: typeof state) => unknown) =>
    typeof sel === 'function' ? sel(state) : state;
  hook.getState = () => state;
  hook.setState = (p: Partial<typeof state>) => Object.assign(state, p);
  return { useContactStore: hook };
});

vi.mock('@/stores/template-store', () => {
  const state = { templates: [], addTemplate: async () => {} };
  const hook = (sel?: (s: typeof state) => unknown) =>
    typeof sel === 'function' ? sel(state) : state;
  hook.getState = () => state;
  hook.setState = (p: Partial<typeof state>) => Object.assign(state, p);
  return { useTemplateStore: hook };
});

// ─── Misc dependency mocks ────────────────────────────────────────────────────

vi.mock('@/stores/toast-store', () => ({
  toast: { info: () => {}, error: () => {}, success: () => {} },
}));

vi.mock('@/lib/plugin-hooks', () => ({
  identityHooks: {
    onSignatureRender: { size: 0, transform: async (value: unknown) => value },
    onIdentitySelect: { size: 0, emit: async () => {} },
  },
  templateHooks: {
    onTemplateRender: { size: 0, transform: async (value: unknown) => value },
    onTemplateApply: { size: 0, emit: async () => {} },
  },
  emailHooks: {
    onComposerOpen: { call: async () => [] },
    onRecipientChange: { call: async () => [] },
    getRecipientSuggestions: { call: async () => [] },
    onRecipientChipsChange: { transform: async (chips: unknown) => chips },
    onDraftChange: { emit: () => {} },
    onBeforeDraftAutoSave: { transform: async (draft: unknown) => draft },
    onBeforeEmailSend: { intercept: async () => true, interceptOutcome: async () => 'allowed' },
    onComposeSend: { takeOver: async () => 'default' },
    onTransformOutgoingEmail: { transform: async (email: unknown) => email },
  },
  contactHooks: {
    search: { call: async () => [] },
    onProvideRecipientSuggestions: { transform: async (initial: unknown) => initial },
  },
}));

vi.mock('@/lib/email-sanitization', () => ({
  sanitizeSignatureHtml: (v: string) => v,
  sanitizeEmailHtml: (v: string) => v,
  parseHtmlSafely: (html: string) => new DOMParser().parseFromString(html, 'text/html'),
}));

vi.mock('@/lib/email-threading', () => ({
  computeReplyThreadingHeaders: () => ({ inReplyTo: [], references: [] }),
}));
vi.mock('@/lib/signature-utils', () => ({
  appendPlainTextSignature: (body: string) => body,
  getPlainTextSignature: () => '',
}));
vi.mock('@/lib/sub-addressing', () => ({ generateSubAddress: () => '' }));
vi.mock('@/lib/debug', () => ({ debug: { log: () => {}, warn: () => {}, error: () => {} } }));
vi.mock('@/components/email/quoted-html', () => ({
  buildQuotedHtmlBlock: () => '',
  serializeEditorContent: () => '',
}));
vi.mock('@/lib/template-utils', () => ({ substitutePlaceholders: (s: string) => s }));

// ─── Tests ────────────────────────────────────────────────────────────────────

/**
 * A host that replaces the compose session - a mailto: click, say - must not
 * drop text the user has not sent. It hands a follow-up to requestCloseRef and
 * the composer runs it only once it has really closed, so "Save" and "Discard"
 * continue into the new session while "Cancel" leaves the draft standing.
 */

const REOPENED_REPLY = {
  to: 'bob@example.com',
  cc: '',
  bcc: '',
  subject: 'Re: Plans',
  body: '<p>Still typing</p>',
  showCc: false,
  showBcc: false,
  selectedIdentityId: 'id-me',
  subAddressTag: '',
  mode: 'compose' as const,
  draftId: 'draft-7',
  inReplyTo: ['parent@example.com'],
  references: ['root@example.com', 'parent@example.com'],
};

describe('re-opened reply draft', () => {
  it('saves with the threading headers it was opened with', async () => {
    const createDraft = vi.fn().mockResolvedValue('draft-8');
    useAuthStore.setState({
      client: {
        createDraft,
        getEmail: vi.fn().mockResolvedValue({ id: 'draft-8', attachments: [] }),
        hasDelayedSend: () => false,
        getMaxDelayedSend: () => 0,
      } as never,
      activeAccountId: 'acct-A' as never,
    });

    const requestCloseRef = { current: null } as React.MutableRefObject<((afterClose?: () => void) => void) | null>;
    render(<EmailComposer initialData={REOPENED_REPLY} requestCloseRef={requestCloseRef} onClose={vi.fn()} />);
    fireEvent.change(screen.getByDisplayValue('Re: Plans'), { target: { value: 'Re: Plans, edited' } });

    act(() => requestCloseRef.current!(vi.fn()));
    const dialog = await screen.findByRole('alertdialog');
    fireEvent.click(within(dialog).getByText('save'));

    await waitFor(() => expect(createDraft).toHaveBeenCalled());
    const args = createDraft.mock.calls[0];
    expect(args[11]).toEqual(['parent@example.com']);
    expect(args[12]).toEqual(['root@example.com', 'parent@example.com']);
    useAuthStore.setState({ client: null, activeAccountId: null });
  });
});