import { useThrottleFn } from '@vueuse/core'
import { beforeEach, describe, expect, it, vi } from 'vitest'
import { ref } from 'vue'

import type { LGraph, LGraphNode } from '@/lib/litegraph/src/litegraph'
import { useMinimapGraph } from '@/renderer/extensions/minimap/composables/useMinimapGraph'
import { api } from '@/scripts/api'

vi.mock('@vueuse/core', () => ({
  useThrottleFn: vi.fn((fn) => fn)
}))

vi.mock('@/scripts/api', () => ({
  api: {
    addEventListener: vi.fn(),
    removeEventListener: vi.fn()
  }
}))

describe('useMinimapGraph', () => {
  let mockGraph: LGraph
  let onGraphChangedMock: ReturnType<typeof vi.fn>

  beforeEach(() => {
    vi.clearAllMocks()

    mockGraph = {
      id: 'test-graph-123',
      _nodes: [
        { id: '1', pos: [100, 100], size: [150, 80] },
        { id: '2', pos: [300, 200], size: [120, 60] }
      ],
      links: { link1: { id: 'link1' } },
      onNodeAdded: vi.fn(),
      onNodeRemoved: vi.fn(),
      onConnectionChange: vi.fn()
    } as any

    onGraphChangedMock = vi.fn()
  })

  it('should initialize with empty state', () => {
    const graphRef = ref(mockGraph as any)
    const graphManager = useMinimapGraph(graphRef, onGraphChangedMock)

    expect(graphManager.updateFlags.value).toEqual({
      bounds: false,
      nodes: false,
      connections: false,
      viewport: false
    })
  })

  it('should setup event listeners on init', () => {
    const graphRef = ref(mockGraph as any)
    const graphManager = useMinimapGraph(graphRef, onGraphChangedMock)

    graphManager.init()

    expect(api.addEventListener).toHaveBeenCalledWith(
      'graphChanged',
      expect.any(Function)
    )
  })

  it('should wrap graph callbacks on setup', () => {
    const originalOnNodeAdded = vi.fn()
    const originalOnNodeRemoved = vi.fn()
    const originalOnConnectionChange = vi.fn()

    mockGraph.onNodeAdded = originalOnNodeAdded
    mockGraph.onNodeRemoved = originalOnNodeRemoved
    mockGraph.onConnectionChange = originalOnConnectionChange

    const graphRef = ref(mockGraph as any)
    const graphManager = useMinimapGraph(graphRef, onGraphChangedMock)

    graphManager.setupEventListeners()

    // Should wrap the callbacks
    expect(mockGraph.onNodeAdded).not.toBe(originalOnNodeAdded)
    expect(mockGraph.onNodeRemoved).not.toBe(originalOnNodeRemoved)
    expect(mockGraph.onConnectionChange).not.toBe(originalOnConnectionChange)

    // Test wrapped callbacks
    const testNode = { id: '3' } as LGraphNode
    mockGraph.onNodeAdded!(testNode)

    expect(originalOnNodeAdded).toHaveBeenCalledWith(testNode)
    expect(onGraphChangedMock).toHaveBeenCalled()
  })

  it('should prevent duplicate event listener setup', () => {
    const graphRef = ref(mockGraph as any)
    const graphManager = useMinimapGraph(graphRef, onGraphChangedMock)

    // Store original callbacks for comparison
    // const originalCallbacks = {
    //   onNodeAdded: mockGraph.onNodeAdded,
    //   onNodeRemoved: mockGraph.onNodeRemoved,
    //   onConnectionChange: mockGraph.onConnectionChange
    // }

    graphManager.setupEventListeners()
    const wrappedCallbacks = {
      onNodeAdded: mockGraph.onNodeAdded,
      onNodeRemoved: mockGraph.onNodeRemoved,
      onConnectionChange: mockGraph.onConnectionChange
    }

    // Setup again - should not re-wrap
    graphManager.setupEventListeners()

    expect(mockGraph.onNodeAdded).toBe(wrappedCallbacks.onNodeAdded)
    expect(mockGraph.onNodeRemoved).toBe(wrappedCallbacks.onNodeRemoved)
    expect(mockGraph.onConnectionChange).toBe(
      wrappedCallbacks.onConnectionChange
    )
  })

  it('should cleanup event listeners properly', () => {
    const originalOnNodeAdded = vi.fn()
    const originalOnNodeRemoved = vi.fn()
    const originalOnConnectionChange = vi.fn()

    mockGraph.onNodeAdded = originalOnNodeAdded
    mockGraph.onNodeRemoved = originalOnNodeRemoved
    mockGraph.onConnectionChange = originalOnConnectionChange

    const graphRef = ref(mockGraph as any)
    const graphManager = useMinimapGraph(graphRef, onGraphChangedMock)

    graphManager.setupEventListeners()
    graphManager.cleanupEventListeners()

    // Should restore original callbacks
    expect(mockGraph.onNodeAdded).toBe(originalOnNodeAdded)
    expect(mockGraph.onNodeRemoved).toBe(originalOnNodeRemoved)
    expect(mockGraph.onConnectionChange).toBe(originalOnConnectionChange)
  })

  it('should handle cleanup for never-setup graph', () => {
    const consoleErrorSpy = vi
      .spyOn(console, 'error')
      .mockImplementation(() => {})

    const graphRef = ref(mockGraph as any)
    const graphManager = useMinimapGraph(graphRef, onGraphChangedMock)

    graphManager.cleanupEventListeners()

    expect(consoleErrorSpy).toHaveBeenCalledWith(
      'Attempted to cleanup event listeners for graph that was never set up'
    )

    consoleErrorSpy.mockRestore()
  })

  it('should detect node position changes', () => {
    const graphRef = ref(mockGraph as any)
    const graphManager = useMinimapGraph(graphRef, onGraphChangedMock)

    // First check - cache initial state
    let hasChanges = graphManager.checkForChanges()
    expect(hasChanges).toBe(true) // Initial cache population

    // No changes
    hasChanges = graphManager.checkForChanges()
    expect(hasChanges).toBe(false)

    // Change node position
    mockGraph._nodes[0].pos = [200, 150]
    hasChanges = graphManager.checkForChanges()
    expect(hasChanges).toBe(true)
    expect(graphManager.updateFlags.value.bounds).toBe(true)
    expect(graphManager.updateFlags.value.nodes).toBe(true)
  })

  it('should detect node count changes', () => {
    const graphRef = ref(mockGraph as any)
    const graphManager = useMinimapGraph(graphRef, onGraphChangedMock)

    // Cache initial state
    graphManager.checkForChanges()

    // Add a node
    mockGraph._nodes.push({ id: '3', pos: [400, 300], size: [100, 50] } as any)

    const hasChanges = graphManager.checkForChanges()
    expect(hasChanges).toBe(true)
    expect(graphManager.updateFlags.value.bounds).toBe(true)
    expect(graphManager.updateFlags.value.nodes).toBe(true)
  })

  it('should detect connection changes', () => {
    const graphRef = ref(mockGraph as any)
    const graphManager = useMinimapGraph(graphRef, onGraphChangedMock)

    // Cache initial state
    graphManager.checkForChanges()

    // Change connections
    mockGraph.links = new Map([
      [1, { id: 1 }],
      [2, { id: 2 }]
    ]) as any

    const hasChanges = graphManager.checkForChanges()
    expect(hasChanges).toBe(true)
    expect(graphManager.updateFlags.value.connections).toBe(true)
  })

  it('should handle node removal in callbacks', () => {
    const originalOnNodeRemoved = vi.fn()
    mockGraph.onNodeRemoved = originalOnNodeRemoved

    const graphRef = ref(mockGraph as any)
    const graphManager = useMinimapGraph(graphRef, onGraphChangedMock)

    graphManager.setupEventListeners()

    const removedNode = { id: '2' } as LGraphNode
    mockGraph.onNodeRemoved!(removedNode)

    expect(originalOnNodeRemoved).toHaveBeenCalledWith(removedNode)
    expect(onGraphChangedMock).toHaveBeenCalled()
  })

  it('should destroy properly', () => {
    const graphRef = ref(mockGraph as any)
    const graphManager = useMinimapGraph(graphRef, onGraphChangedMock)

    graphManager.init()
    graphManager.setupEventListeners()
    graphManager.destroy()

    expect(api.removeEventListener).toHaveBeenCalledWith(
      'graphChanged',
      expect.any(Function)
    )
  })

  it('should clear cache', () => {
    const graphRef = ref(mockGraph as any)
    const graphManager = useMinimapGraph(graphRef, onGraphChangedMock)

    // Populate cache
    graphManager.checkForChanges()

    // Clear cache
    graphManager.clearCache()

    // Should detect changes again after clear
    const hasChanges = graphManager.checkForChanges()
    expect(hasChanges).toBe(true)
  })

  it('should handle null graph gracefully', () => {
    const graphRef = ref(null as any)
    const graphManager = useMinimapGraph(graphRef, onGraphChangedMock)

    expect(() => graphManager.setupEventListeners()).not.toThrow()
    expect(() => graphManager.cleanupEventListeners()).not.toThrow()
    expect(graphManager.checkForChanges()).toBe(false)
  })

  it('should clean up removed nodes from cache', () => {
    const graphRef = ref(mockGraph as any)
    const graphManager = useMinimapGraph(graphRef, onGraphChangedMock)

    // Cache initial state
    graphManager.checkForChanges()

    // Remove a node
    mockGraph._nodes = mockGraph._nodes.filter((n) => n.id !== '2')

    const hasChanges = graphManager.checkForChanges()
    expect(hasChanges).toBe(true)
    expect(graphManager.updateFlags.value.bounds).toBe(true)
  })

  it('should throttle graph changed callback', () => {
    const throttledFn = vi.fn()
    vi.mocked(useThrottleFn).mockReturnValue(throttledFn)

    const graphRef = ref(mockGraph as any)
    const graphManager = useMinimapGraph(graphRef, onGraphChangedMock)

    graphManager.setupEventListeners()

    // Trigger multiple changes rapidly
    mockGraph.onNodeAdded!({ id: '3' } as LGraphNode)
    mockGraph.onNodeAdded!({ id: '4' } as LGraphNode)
    mockGraph.onNodeAdded!({ id: '5' } as LGraphNode)

    // Should be throttled
    expect(throttledFn).toHaveBeenCalledTimes(3)
  })
})