import { EditorSelection } from '@codemirror/state';
import createTestEditor from '../testing/createTestEditor';
import { matchWikiLinkTrigger, createWikiLinkCompletionSource } from './wikiLinkAutocompleteExtension';

describe('wikiLinkAutocompleteExtension', () => {
	describe('matchWikiLinkTrigger', () => {
		it('matches [[ at the end of line', () => {
			const res = matchWikiLinkTrigger('Hello [[');
			expect(res).toEqual({ query: '', matchLength: 2, trigger: '[[' });
		});

		it('matches full-width 【【 for Chinese input method', () => {
			const res1 = matchWikiLinkTrigger('引用笔记：【【');
			expect(res1).toEqual({ query: '', matchLength: 2, trigger: '[[' });

			const res2 = matchWikiLinkTrigger('引用笔记：【【工作周报');
			expect(res2).toEqual({ query: '工作周报', matchLength: 6, trigger: '[[' });
		});

		it('matches full-width ＠ for Chinese input method', () => {
			const res1 = matchWikiLinkTrigger('＠');
			expect(res1).toEqual({ query: '', matchLength: 1, trigger: '@' });

			const res2 = matchWikiLinkTrigger('查看 ＠今天');
			expect(res2).toEqual({ query: '今天', matchLength: 3, trigger: '@' });
		});

		it('matches [[ with partial query', () => {
			const res = matchWikiLinkTrigger('Ref: [[Meeting');
			expect(res).toEqual({ query: 'Meeting', matchLength: 9, trigger: '[[' });
		});

		it('matches @ at start of line', () => {
			const res = matchWikiLinkTrigger('@Today');
			expect(res).toEqual({ query: 'Today', matchLength: 6, trigger: '@' });
		});

		it('matches @ after whitespace or open brackets', () => {
			const res1 = matchWikiLinkTrigger('Check this @journal');
			expect(res1).toEqual({ query: 'journal', matchLength: 8, trigger: '@' });

			const res2 = matchWikiLinkTrigger('(see @note');
			expect(res2).toEqual({ query: 'note', matchLength: 5, trigger: '@' });
		});

		it('does NOT match normal email addresses', () => {
			expect(matchWikiLinkTrigger('user@domain.com')).toBeNull();
			expect(matchWikiLinkTrigger('contact: support@joplinapp.org')).toBeNull();
		});

		it('returns null when no trigger is present', () => {
			expect(matchWikiLinkTrigger('Normal text [1]')).toBeNull();
			expect(matchWikiLinkTrigger('Just a single [')).toBeNull();
		});

		it('returns null across newlines', () => {
			expect(matchWikiLinkTrigger('[[\nSecond line')).toBeNull();
			expect(matchWikiLinkTrigger('@\nSecond line')).toBeNull();
		});
	});

	describe('createWikiLinkCompletionSource', () => {
		it('returns completion options matching searchNotes for @ mention', async () => {
			const mockNotes = [
				{ id: 'note-today', title: '2026-11-01 星期日', parentTitle: '📅 今日日志' },
				{ id: 'note-yesterday', title: '2026-10-31 星期六', parentTitle: '📅 昨日日志' },
			];
			const mockSearch = jest.fn().mockResolvedValue(mockNotes);
			const source = createWikiLinkCompletionSource(mockSearch);

			const initialText = 'Today log: @';
			const editor = await createTestEditor(initialText, EditorSelection.cursor(initialText.length), []);

			const result = await source({
				state: editor.state,
				pos: initialText.length,
				explicit: true,
			} as any);

			expect(result).not.toBeNull();
			expect(result?.from).toBe(initialText.indexOf('@'));
			expect(result?.options.length).toBe(2);
			expect(result?.options[0].label).toBe('2026-11-01 星期日');
			expect(result?.options[0].detail).toBe('📅 今日日志');
		});

		it('applies replacement with standard Joplin markdown link [Title](:/id)', async () => {
			const mockNotes = [
				{ id: 'uuid-today', title: '2026-11-01 星期日' },
			];
			const mockSearch = jest.fn().mockResolvedValue(mockNotes);
			const source = createWikiLinkCompletionSource(mockSearch);

			const initialText = 'See @2026';
			const editor = await createTestEditor(initialText, EditorSelection.cursor(initialText.length), []);

			const result = await source({
				state: editor.state,
				pos: initialText.length,
				explicit: true,
			} as any);

			expect(result).not.toBeNull();
			const option = result!.options[0];

			// Simulate apply
			(option.apply as any)(editor, option, result!.from, initialText.length);

			expect(editor.state.doc.toString()).toBe('See [2026-11-01 星期日](:/uuid-today)');
		});

		it('creates note on demand when selecting __CREATE_ item', async () => {
			const mockNotes = [
				{ id: '__CREATE_TODAY__', title: '2026-11-01 星期日', parentTitle: '📅 新建今日日志' },
			];
			const mockSearch = jest.fn().mockResolvedValue(mockNotes);
			const mockCreate = jest.fn().mockResolvedValue({ id: 'brand-new-uuid', title: '2026-11-01 星期日' });
			const source = createWikiLinkCompletionSource(mockSearch, mockCreate);

			const initialText = 'Today: @今天';
			const editor = await createTestEditor(initialText, EditorSelection.cursor(initialText.length), []);

			const result = await source({
				state: editor.state,
				pos: initialText.length,
				explicit: true,
			} as any);

			expect(result).not.toBeNull();
			const option = result!.options[0];

			(option.apply as any)(editor, option, result!.from, initialText.length);

			// Wait for async createNote to resolve and dispatch
			await new Promise(r => setTimeout(r, 20));

			expect(mockCreate).toHaveBeenCalledWith('2026-11-01 星期日');
			expect(editor.state.doc.toString()).toBe('Today: [2026-11-01 星期日](:/brand-new-uuid)');
		});
	});
});