import { describe, it, expect, vi } from 'vitest'
import { renderHook } from '@testing-library/react'
import { useCommandRegistry, buildTypeCommands, extractVaultTypes, pluralizeType, groupSortKey } from './useCommandRegistry'
import type { CommandAction } from './useCommandRegistry'

function makeConfig(overrides: Record<string, unknown> = {}) {
  return {
    activeTabPath: '/vault/test.md',
    entries: [],
    modifiedCount: 0,
    onQuickOpen: vi.fn(),
    onCreateNote: vi.fn(),
    onCreateNoteOfType: vi.fn(),
    onSave: vi.fn(),
    onOpenSettings: vi.fn(),
    onTrashNote: vi.fn(),
    onRestoreNote: vi.fn(),
    onArchiveNote: vi.fn(),
    onUnarchiveNote: vi.fn(),
    onCommitPush: vi.fn(),
    onResolveConflicts: vi.fn(),
    onSetViewMode: vi.fn(),
    onToggleInspector: vi.fn(),
    onToggleDiff: vi.fn(),
    onToggleRawEditor: vi.fn(),
    onToggleAIChat: vi.fn(),
    onOpenVault: vi.fn(),
    activeNoteModified: false,
    onZoomIn: vi.fn(),
    onZoomOut: vi.fn(),
    onZoomReset: vi.fn(),
    zoomLevel: 100,
    onSelect: vi.fn(),
    onOpenDailyNote: vi.fn(),
    onCloseTab: vi.fn(),
    onGoBack: vi.fn(),
    onGoForward: vi.fn(),
    canGoBack: false,
    canGoForward: false,
    onCheckForUpdates: vi.fn(),
    onCreateType: vi.fn(),
    ...overrides,
  }
}

function findCommand(commands: CommandAction[], id: string): CommandAction | undefined {
  return commands.find(c => c.id === id)
}

describe('useCommandRegistry', () => {
  it('includes resolve-conflicts command in Git group', () => {
    const config = makeConfig()
    const { result } = renderHook(() => useCommandRegistry(config))
    const cmd = findCommand(result.current, 'resolve-conflicts')
    expect(cmd).toBeDefined()
    expect(cmd!.group).toBe('Git')
    expect(cmd!.label).toBe('Resolve Conflicts')
  })

  it('resolve-conflicts is always enabled', () => {
    const config = makeConfig()
    const { result } = renderHook(() => useCommandRegistry(config))
    const cmd = findCommand(result.current, 'resolve-conflicts')
    expect(cmd!.enabled).toBe(true)
  })

  it('resolve-conflicts executes onResolveConflicts callback', () => {
    const onResolveConflicts = vi.fn()
    const config = makeConfig({ onResolveConflicts })
    const { result } = renderHook(() => useCommandRegistry(config))
    const cmd = findCommand(result.current, 'resolve-conflicts')
    cmd!.execute()
    expect(onResolveConflicts).toHaveBeenCalled()
  })

  it('resolve-conflicts has searchable keywords', () => {
    const config = makeConfig()
    const { result } = renderHook(() => useCommandRegistry(config))
    const cmd = findCommand(result.current, 'resolve-conflicts')
    expect(cmd!.keywords).toContain('conflict')
    expect(cmd!.keywords).toContain('merge')
  })

  it('commit-push is enabled when modifiedCount > 0', () => {
    const config = makeConfig({ modifiedCount: 5 })
    const { result } = renderHook(() => useCommandRegistry(config))
    const cmd = findCommand(result.current, 'commit-push')
    expect(cmd!.enabled).toBe(true)
  })

  it('commit-push is disabled when modifiedCount is 0', () => {
    const config = makeConfig({ modifiedCount: 0 })
    const { result } = renderHook(() => useCommandRegistry(config))
    const cmd = findCommand(result.current, 'commit-push')
    expect(cmd!.enabled).toBe(false)
  })

  it('includes reindex-vault command in Settings group', () => {
    const config = makeConfig({ onReindexVault: vi.fn() })
    const { result } = renderHook(() => useCommandRegistry(config))
    const cmd = findCommand(result.current, 'reindex-vault')
    expect(cmd).toBeDefined()
    expect(cmd!.group).toBe('Settings')
    expect(cmd!.label).toBe('Reindex Vault')
  })

  it('reindex-vault is enabled when onReindexVault is provided', () => {
    const config = makeConfig({ onReindexVault: vi.fn() })
    const { result } = renderHook(() => useCommandRegistry(config))
    const cmd = findCommand(result.current, 'reindex-vault')
    expect(cmd!.enabled).toBe(true)
  })

  it('reindex-vault is disabled when onReindexVault is not provided', () => {
    const config = makeConfig()
    const { result } = renderHook(() => useCommandRegistry(config))
    const cmd = findCommand(result.current, 'reindex-vault')
    expect(cmd!.enabled).toBe(false)
  })

  it('reindex-vault executes onReindexVault callback', () => {
    const onReindexVault = vi.fn()
    const config = makeConfig({ onReindexVault })
    const { result } = renderHook(() => useCommandRegistry(config))
    const cmd = findCommand(result.current, 'reindex-vault')
    cmd!.execute()
    expect(onReindexVault).toHaveBeenCalled()
  })

  it('reindex-vault has searchable keywords', () => {
    const config = makeConfig({ onReindexVault: vi.fn() })
    const { result } = renderHook(() => useCommandRegistry(config))
    const cmd = findCommand(result.current, 'reindex-vault')
    expect(cmd!.keywords).toContain('reindex')
    expect(cmd!.keywords).toContain('search')
  })

  it('resolve-conflicts stays enabled across rerenders', () => {
    const config = makeConfig()
    const { result, rerender } = renderHook(
      (props) => useCommandRegistry(props),
      { initialProps: config },
    )
    expect(findCommand(result.current, 'resolve-conflicts')!.enabled).toBe(true)

    rerender(makeConfig())
    expect(findCommand(result.current, 'resolve-conflicts')!.enabled).toBe(true)
  })
})

describe('pluralizeType', () => {
  it('pluralizes regular types', () => {
    expect(pluralizeType('Project')).toBe('Projects')
    expect(pluralizeType('Note')).toBe('Notes')
  })

  it('uses overrides for irregular plurals', () => {
    expect(pluralizeType('Person')).toBe('People')
    expect(pluralizeType('Responsibility')).toBe('Responsibilities')
  })

  it('handles sibilant endings', () => {
    expect(pluralizeType('Address')).toBe('Addresses')
  })
})

describe('extractVaultTypes', () => {
  it('returns default types when no entries', () => {
    expect(extractVaultTypes([])).toEqual(['Event', 'Person', 'Project', 'Note'])
  })

  it('extracts unique types from entries', () => {
    const entries = [
      { path: '/a', title: 'A', isA: 'Project' },
      { path: '/b', title: 'B', isA: 'Project' },
      { path: '/c', title: 'C', isA: 'Event' },
    ] as never[]
    const types = extractVaultTypes(entries)
    expect(types).toContain('Project')
    expect(types).toContain('Event')
    expect(types).toHaveLength(2)
  })

  it('excludes trashed entries', () => {
    const entries = [
      { path: '/a', title: 'A', isA: 'Project', trashed: true },
    ] as never[]
    expect(extractVaultTypes(entries)).toEqual(['Event', 'Person', 'Project', 'Note'])
  })
})

describe('groupSortKey', () => {
  it('returns correct order for groups', () => {
    expect(groupSortKey('Navigation')).toBeLessThan(groupSortKey('Note'))
    expect(groupSortKey('Note')).toBeLessThan(groupSortKey('Git'))
    expect(groupSortKey('Git')).toBeLessThan(groupSortKey('View'))
  })
})

describe('install-mcp command', () => {
  it('is enabled when mcpStatus is not_installed and handler provided', () => {
    const config = makeConfig({ mcpStatus: 'not_installed', onInstallMcp: vi.fn() })
    const { result } = renderHook(() => useCommandRegistry(config))
    const cmd = findCommand(result.current, 'install-mcp')
    expect(cmd).toBeDefined()
    expect(cmd!.enabled).toBe(true)
    expect(cmd!.label).toBe('Install MCP Server')
  })

  it('is enabled when mcpStatus is installed and handler provided (restore use case)', () => {
    const config = makeConfig({ mcpStatus: 'installed', onInstallMcp: vi.fn() })
    const { result } = renderHook(() => useCommandRegistry(config))
    const cmd = findCommand(result.current, 'install-mcp')
    expect(cmd!.enabled).toBe(true)
    expect(cmd!.label).toBe('Restore MCP Server')
  })

  it('is enabled even when mcpStatus is checking', () => {
    const config = makeConfig({ mcpStatus: 'checking', onInstallMcp: vi.fn() })
    const { result } = renderHook(() => useCommandRegistry(config))
    const cmd = findCommand(result.current, 'install-mcp')
    expect(cmd!.enabled).toBe(true)
  })

  it('is enabled even when no handler provided', () => {
    const config = makeConfig({ mcpStatus: 'not_installed' })
    const { result } = renderHook(() => useCommandRegistry(config))
    const cmd = findCommand(result.current, 'install-mcp')
    expect(cmd!.enabled).toBe(true)
  })

  it('has restore keyword for discoverability', () => {
    const config = makeConfig({ mcpStatus: 'installed', onInstallMcp: vi.fn() })
    const { result } = renderHook(() => useCommandRegistry(config))
    const cmd = findCommand(result.current, 'install-mcp')
    expect(cmd!.keywords).toContain('restore')
    expect(cmd!.keywords).toContain('mcp')
    expect(cmd!.keywords).toContain('claude')
  })

  it('executes onInstallMcp callback', () => {
    const onInstallMcp = vi.fn()
    const config = makeConfig({ mcpStatus: 'installed', onInstallMcp })
    const { result } = renderHook(() => useCommandRegistry(config))
    const cmd = findCommand(result.current, 'install-mcp')
    cmd!.execute()
    expect(onInstallMcp).toHaveBeenCalled()
  })

  it('is in Settings group', () => {
    const config = makeConfig({ mcpStatus: 'installed', onInstallMcp: vi.fn() })
    const { result } = renderHook(() => useCommandRegistry(config))
    const cmd = findCommand(result.current, 'install-mcp')
    expect(cmd!.group).toBe('Settings')
  })
})

describe('reload-vault command', () => {
  it('is present in Settings group', () => {
    const config = makeConfig({ onReloadVault: vi.fn() })
    const { result } = renderHook(() => useCommandRegistry(config))
    const cmd = findCommand(result.current, 'reload-vault')
    expect(cmd).toBeDefined()
    expect(cmd!.group).toBe('Settings')
    expect(cmd!.label).toBe('Reload Vault')
  })

  it('is enabled when onReloadVault is provided', () => {
    const config = makeConfig({ onReloadVault: vi.fn() })
    const { result } = renderHook(() => useCommandRegistry(config))
    const cmd = findCommand(result.current, 'reload-vault')
    expect(cmd!.enabled).toBe(true)
  })

  it('is disabled when onReloadVault is not provided', () => {
    const config = makeConfig()
    const { result } = renderHook(() => useCommandRegistry(config))
    const cmd = findCommand(result.current, 'reload-vault')
    expect(cmd!.enabled).toBe(false)
  })

  it('executes onReloadVault callback', () => {
    const onReloadVault = vi.fn()
    const config = makeConfig({ onReloadVault })
    const { result } = renderHook(() => useCommandRegistry(config))
    const cmd = findCommand(result.current, 'reload-vault')
    cmd!.execute()
    expect(onReloadVault).toHaveBeenCalled()
  })

  it('has searchable keywords', () => {
    const config = makeConfig({ onReloadVault: vi.fn() })
    const { result } = renderHook(() => useCommandRegistry(config))
    const cmd = findCommand(result.current, 'reload-vault')
    expect(cmd!.keywords).toContain('reload')
    expect(cmd!.keywords).toContain('refresh')
    expect(cmd!.keywords).toContain('rescan')
  })
})

describe('buildTypeCommands', () => {
  it('creates new and list commands for each type', () => {
    const onCreateNoteOfType = vi.fn()
    const onSelect = vi.fn()
    const commands = buildTypeCommands(['Project', 'Event'], onCreateNoteOfType, onSelect)
    expect(commands).toHaveLength(4)
    expect(commands[0].id).toBe('new-project')
    expect(commands[1].id).toBe('list-project')
    expect(commands[2].id).toBe('new-event')
    expect(commands[3].id).toBe('list-event')
  })
})