import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'

const mocks = vi.hoisted(() => {
	const nativeUnreadAction = {
		id: 'comments-unread',
		displayName: vi.fn((_context?: unknown) => 'Comment'),
		title: vi.fn((_context?: unknown) => 'Comment'),
		iconSvgInline: vi.fn((_context?: unknown) => '<svg data-native="true"/>'),
		enabled: vi.fn(({ nodes }) => Number(nodes[0]?.attributes?.['comments-unread']) > 0),
		exec: vi.fn(),
		inline: vi.fn(() => true),
	}
	return {
		emit: vi.fn(),
		getSidebar: vi.fn(),
		getClient: vi.fn(),
		getDavNameSpaces: vi.fn(() => 'xmlns:d="DAV:" xmlns:oc="http://owncloud.org/ns"'),
		getDavProperties: vi.fn(() => '<oc:comments-count />'),
		getFileActions: vi.fn(() => [nativeUnreadAction]),
		getFilesRegistry: vi.fn(() => ({ addEventListener: vi.fn() })),
		nativeUnreadAction,
		resultToNode: vi.fn(),
		stat: vi.fn(),
		registerDavProperty: vi.fn(),
		registerFileAction: vi.fn(),
		registerSidebarTab: vi.fn(),
		loadState: vi.fn(),
		open: vi.fn(),
		setActiveTab: vi.fn(),
	}
})

vi.mock('@nextcloud/files', () => ({
	getFileActions: mocks.getFileActions,
	getFilesRegistry: mocks.getFilesRegistry,
	getSidebar: mocks.getSidebar,
	registerFileAction: mocks.registerFileAction,
	registerSidebarTab: mocks.registerSidebarTab,
	Permission: { NONE: 0 },
}))

vi.mock('@nextcloud/files/dav', () => ({
	getClient: mocks.getClient,
	getDavNameSpaces: mocks.getDavNameSpaces,
	getDavProperties: mocks.getDavProperties,
	registerDavProperty: mocks.registerDavProperty,
	resultToNode: mocks.resultToNode,
}))

vi.mock('@nextcloud/event-bus', () => ({
	emit: mocks.emit,
}))

vi.mock('@nextcloud/initial-state', () => ({
	loadState: mocks.loadState,
}))

import { action } from '../src/main'

const COMMENTS_TAB_ID = 'korean-comments-only'

const node = {
	root: '/files/alice',
	permissions: 1,
	fileid: 42,
	path: '/report.pdf',
	displayname: 'report.pdf',
	attributes: { 'comments-count': 0 },
	source: 'https://cloud.example/remote.php/dav/files/alice/report.pdf',
	update: vi.fn(),
}
const context = {
	nodes: [node],
	folder: {},
	view: {},
	contents: [node],
}

beforeEach(() => {
	mocks.open.mockReset()
	mocks.emit.mockReset()
	mocks.stat.mockReset()
	mocks.resultToNode.mockReset()
	mocks.getClient.mockReturnValue({ stat: mocks.stat })
	node.update.mockReset()
	mocks.setActiveTab.mockReset()
	mocks.loadState.mockReset()
	mocks.loadState.mockReturnValue(true)
	mocks.getSidebar.mockReturnValue({
		available: true,
		isOpen: false,
		activeTab: undefined,
		node: undefined,
		open: mocks.open,
		setActiveTab: mocks.setActiveTab,
	})
})

afterEach(() => {
	vi.unstubAllGlobals()
	vi.useRealTimers()
})

describe('Korean comments file action', () => {
	it('registers the comment count property and comments-only sidebar tab', () => {
		expect(mocks.registerDavProperty).toHaveBeenCalledWith('oc:comments-count')
		expect(mocks.registerSidebarTab).toHaveBeenCalledWith(expect.objectContaining({
			id: COMMENTS_TAB_ID,
			displayName: '댓글',
		}))
	})

	it('mounts the native Comments view in the comments-only tab', async () => {
		const mounted: Array<{ resourceType: string, resourceId: number }> = []
		const definitions = new Map<string, CustomElementConstructor>()
		class FakeElement {
			style: Record<string, string> = {}
			isConnected = true
			append() {}
			replaceChildren() {}
		}
		class FakeCommentsView {
			constructor(resourceType: string, options: { props: { resourceId: number } }) {
				mounted.push({ resourceType, resourceId: options.props.resourceId })
			}
			$unmount() {}
			update() {}
		}
		vi.stubGlobal('HTMLElement', FakeElement)
		vi.stubGlobal('document', {
			createElement: () => ({ className: '' }),
		})
		vi.stubGlobal('window', {
			OCA: { Comments: { View: FakeCommentsView } },
			customElements: {
				get: (name: string) => definitions.get(name),
				define: (name: string, definition: CustomElementConstructor) => definitions.set(name, definition),
			},
			clearTimeout,
			setTimeout,
		})

		const tab = mocks.registerSidebarTab.mock.calls[0][0]
		await tab.onInit()
		const Element = definitions.get('korean_comments_action-comments-tab')!
		const element = new Element() as unknown as { node: typeof node, connectedCallback(): void }
		element.node = node
		element.connectedCallback()
		await Promise.resolve()

		expect(mounted).toEqual([{ resourceType: 'files', resourceId: 42 }])
	})

	it('retains separate count refreshes when switching files during debounce', async () => {
		vi.useFakeTimers()
		let mutationCallback: (() => void) | undefined
		const definitions = new Map<string, CustomElementConstructor>()
		class FakeElement {
			style: Record<string, string> = {}
			isConnected = true
			append() {}
			replaceChildren() {}
		}
		class FakeMutationObserver {
			constructor(callback: () => void) {
				mutationCallback = callback
			}
			observe() {}
			disconnect() {}
		}
		class FakeCommentsView {
			$unmount() {}
			update() {}
		}
		vi.stubGlobal('HTMLElement', FakeElement)
		vi.stubGlobal('MutationObserver', FakeMutationObserver)
		vi.stubGlobal('document', {
			createElement: () => ({ className: '' }),
		})
		vi.stubGlobal('window', {
			OCA: { Comments: { View: FakeCommentsView } },
			customElements: {
				get: (name: string) => definitions.get(name),
				define: (name: string, definition: CustomElementConstructor) => definitions.set(name, definition),
			},
			clearTimeout,
			setTimeout,
		})
		mocks.stat.mockResolvedValue({ data: {} })
		mocks.resultToNode.mockReturnValue({ attributes: { 'comments-count': 0 } })

		const tab = mocks.registerSidebarTab.mock.calls[0][0]
		await tab.onInit()
		const Element = definitions.get('korean_comments_action-comments-tab')!
		const element = new Element() as unknown as { node: typeof node, connectedCallback(): void }
		element.node = node
		element.connectedCallback()
		await Promise.resolve()
		vi.clearAllTimers()
		mocks.stat.mockClear()

		mutationCallback!()
		const secondNode = {
			...node,
			fileid: 43,
			path: '/second.pdf',
			displayname: 'second.pdf',
			source: 'https://cloud.example/remote.php/dav/files/alice/second.pdf',
			update: vi.fn(),
		}
		element.node = secondNode
		await Promise.resolve()
		await vi.advanceTimersByTimeAsync(200)

		const paths = mocks.stat.mock.calls.map(([path]) => path)
		expect(paths).toContain('/files/alice/report.pdf')
		expect(paths).toContain('/files/alice/second.pdf')
	})

	it('shows only an empty square icon when the file has no comments', () => {
		expect(mocks.registerFileAction).toHaveBeenCalledWith(action)
		expect(action.displayName(context as never)).toBe('')
		expect(action.iconSvgInline(context as never)).toContain('data-comment-state="empty"')
		expect(action.inline?.(context as never)).toBe(true)
	})

	it('shows a square with dots when the file has comments', () => {
		const withComments = {
			...context,
			nodes: [{ ...node, attributes: { 'comments-count': 2 } }],
		}

		expect(action.iconSvgInline(withComments as never)).toContain('data-comment-state="has-comments"')
	})

	it('refreshes the row icon state after native comment mutations', async () => {
		const module = await import('../src/main') as unknown as {
			refreshCommentCount(target: typeof node): Promise<void>
		}
		mocks.stat.mockResolvedValue({ data: {} })
		mocks.resultToNode.mockReturnValue({ attributes: { 'comments-count': 1 } })

		expect(module.refreshCommentCount).toBeTypeOf('function')
		await module.refreshCommentCount(node)

		expect(mocks.stat).toHaveBeenCalledWith('/files/alice/report.pdf', expect.any(Object))
		expect(node.update).toHaveBeenCalledWith({ 'comments-count': 1 })
		expect(mocks.emit).toHaveBeenCalledWith('files:node:updated', node)
	})

	it('does not emit a node update when the comment count is unchanged', async () => {
		const module = await import('../src/main') as unknown as {
			refreshCommentCount(target: typeof node): Promise<void>
		}
		const unchangedNode = {
			...node,
			attributes: { 'comments-count': 1 },
			update: vi.fn(),
		}
		mocks.stat.mockResolvedValue({ data: {} })
		mocks.resultToNode.mockReturnValue({ attributes: { 'comments-count': 1 } })

		await module.refreshCommentCount(unchangedNode)

		expect(unchangedNode.update).not.toHaveBeenCalled()
		expect(mocks.emit).not.toHaveBeenCalled()
	})

	it('ignores an older count refresh that finishes after a newer request', async () => {
		const module = await import('../src/main') as unknown as {
			refreshCommentCount(target: typeof node): Promise<void>
		}
		let resolveFirst!: (value: unknown) => void
		let resolveSecond!: (value: unknown) => void
		const first = new Promise((resolve) => { resolveFirst = resolve })
		const second = new Promise((resolve) => { resolveSecond = resolve })
		mocks.stat.mockReturnValueOnce(first).mockReturnValueOnce(second)
		mocks.resultToNode.mockImplementation((data: { count: number }) => ({
			attributes: { 'comments-count': data.count },
		}))

		const older = module.refreshCommentCount(node)
		const newer = module.refreshCommentCount(node)
		resolveSecond({ data: { count: 2 } })
		await newer
		resolveFirst({ data: { count: 1 } })
		await older

		expect(node.update).toHaveBeenCalledTimes(1)
		expect(node.update).toHaveBeenCalledWith({ 'comments-count': 2 })
	})

	it('reuses the native unread slot so only one comment icon is shown', async () => {
		const unreadContext = {
			...context,
			nodes: [{ ...node, attributes: { 'comments-count': 2, 'comments-unread': 1 } }],
		}

		expect(action.enabled?.(unreadContext as never)).toBe(false)
		expect(mocks.nativeUnreadAction.displayName(unreadContext as never)).toBe('')
		expect(mocks.nativeUnreadAction.iconSvgInline(unreadContext as never)).toContain('data-comment-state="has-comments"')
		expect(await mocks.nativeUnreadAction.exec(unreadContext as never)).toBeNull()
		expect(mocks.open).toHaveBeenCalledWith(unreadContext.nodes[0], COMMENTS_TAB_ID)
	})

	it('refuses to adopt a native unread action without its eligibility predicate', async () => {
		const module = await import('../src/main') as unknown as {
			adoptNativeUnreadAction(candidate: Record<string, unknown>): boolean
		}
		const incompleteAction = {
			id: 'comments-unread',
			displayName: vi.fn(),
			iconSvgInline: vi.fn(),
			exec: vi.fn(),
		}

		expect(module.adoptNativeUnreadAction).toBeTypeOf('function')
		expect(module.adoptNativeUnreadAction(incompleteAction)).toBe(false)
		expect(incompleteAction.exec).not.toBe(action.exec)
	})

	it('keeps an adopted native action disabled when its predicate returns undefined', async () => {
		const module = await import('../src/main') as unknown as {
			adoptNativeUnreadAction(candidate: Record<string, unknown>): boolean
		}
		const malformedAction = {
			id: 'comments-unread',
			displayName: vi.fn(),
			iconSvgInline: vi.fn(),
			exec: vi.fn(),
			enabled: vi.fn((_context?: unknown) => undefined),
		}

		expect(module.adoptNativeUnreadAction(malformedAction)).toBe(true)
		expect(malformedAction.enabled(context as never)).toBe(false)
	})

	it('keeps the adopted unread action hidden for unsupported contexts', () => {
		const multiple = { ...context, nodes: [node, node] }
		const noPermission = {
			...context,
			nodes: [{ ...node, permissions: 0, attributes: { 'comments-count': 2, 'comments-unread': 1 } }],
		}

		expect(mocks.nativeUnreadAction.enabled(multiple as never)).toBe(false)
		expect(mocks.nativeUnreadAction.enabled(noPermission as never)).toBe(false)
	})

	it('rejects execution for unsupported contexts instead of falling back to Activity', async () => {
		const multiple = { ...context, nodes: [node, node] }

		expect(await action.exec(multiple as never)).toBe(false)
		expect(mocks.open).not.toHaveBeenCalled()
		expect(mocks.setActiveTab).not.toHaveBeenCalled()
	})

	it('opens the dedicated comments-only tab instead of Activity', async () => {
		expect(action.enabled?.(context as never)).toBe(true)
		expect(await action.exec(context as never)).toBeNull()
		expect(mocks.open).toHaveBeenCalledWith(node, COMMENTS_TAB_ID)
		expect(mocks.open).not.toHaveBeenCalledWith(node, 'activity')
	})

	it('keeps the dedicated comments-only tab active when clicked again', async () => {
		mocks.getSidebar.mockReturnValue({
			available: true,
			isOpen: true,
			activeTab: COMMENTS_TAB_ID,
			node,
			open: mocks.open,
			setActiveTab: mocks.setActiveTab,
		})

		expect(await action.exec(context as never)).toBeNull()
		expect(mocks.setActiveTab).toHaveBeenCalledWith(COMMENTS_TAB_ID)
		expect(mocks.open).not.toHaveBeenCalled()
	})

	it('uses the comments-only tab even when Activity integration is disabled', async () => {
		mocks.loadState.mockReturnValue(false)

		expect(action.enabled?.(context as never)).toBe(true)
		expect(await action.exec(context as never)).toBeNull()
		expect(mocks.open).toHaveBeenCalledWith(node, COMMENTS_TAB_ID)
	})

	it('hides when the Comments app is unavailable', () => {
		mocks.loadState.mockReturnValue(null)

		expect(action.enabled?.(context as never)).toBe(false)
	})
})