import { describe, expect, it, vi } from "vitest"

import { LGraph, LGraphNode } from "@/litegraph"
import { ExecutableNodeDTO } from "@/subgraph/ExecutableNodeDTO"

import {
  createNestedSubgraphs,
  createTestSubgraph,
  createTestSubgraphNode,
} from "./fixtures/subgraphHelpers"

describe("ExecutableNodeDTO Creation", () => {
  it("should create DTO from regular node", () => {
    const graph = new LGraph()
    const node = new LGraphNode("Test Node")
    node.addInput("in", "number")
    node.addOutput("out", "string")
    graph.add(node)

    const executableNodes = new Map()
    const dto = new ExecutableNodeDTO(node, [], executableNodes, undefined)

    expect(dto.node).toBe(node)
    expect(dto.subgraphNodePath).toEqual([])
    expect(dto.subgraphNode).toBeUndefined()
    expect(dto.id).toBe(node.id.toString())
  })

  it("should create DTO with subgraph path", () => {
    const graph = new LGraph()
    const node = new LGraphNode("Inner Node")
    node.id = 42
    graph.add(node)
    const subgraphPath = ["10", "20"] as const

    const dto = new ExecutableNodeDTO(node, subgraphPath, new Map(), undefined)

    expect(dto.subgraphNodePath).toBe(subgraphPath)
    expect(dto.id).toBe("10:20:42")
  })

  it("should clone input slot data", () => {
    const graph = new LGraph()
    const node = new LGraphNode("Test Node")
    node.addInput("input1", "number")
    node.addInput("input2", "string")
    node.inputs[0].link = 123 // Simulate connected input
    graph.add(node)

    const dto = new ExecutableNodeDTO(node, [], new Map(), undefined)

    expect(dto.inputs).toHaveLength(2)
    expect(dto.inputs[0].name).toBe("input1")
    expect(dto.inputs[0].type).toBe("number")
    expect(dto.inputs[0].linkId).toBe(123)
    expect(dto.inputs[1].name).toBe("input2")
    expect(dto.inputs[1].type).toBe("string")
    expect(dto.inputs[1].linkId).toBeNull()

    // Should be a copy, not reference
    expect(dto.inputs).not.toBe(node.inputs)
  })

  it("should inherit graph reference", () => {
    const graph = new LGraph()
    const node = new LGraphNode("Test Node")
    graph.add(node)

    const dto = new ExecutableNodeDTO(node, [], new Map(), undefined)

    expect(dto.graph).toBe(graph)
  })

  it("should wrap applyToGraph method if present", () => {
    const graph = new LGraph()
    const node = new LGraphNode("Test Node")
    const mockApplyToGraph = vi.fn()
    Object.assign(node, { applyToGraph: mockApplyToGraph })
    graph.add(node)

    const dto = new ExecutableNodeDTO(node, [], new Map(), undefined)

    expect(dto.applyToGraph).toBeDefined()

    // Test that wrapper calls original method
    const args = ["arg1", "arg2"]
    dto.applyToGraph!(args[0], args[1])

    expect(mockApplyToGraph).toHaveBeenCalledWith(args[0], args[1])
  })

  it("should not create applyToGraph wrapper if method doesn't exist", () => {
    const graph = new LGraph()
    const node = new LGraphNode("Test Node")
    graph.add(node)

    const dto = new ExecutableNodeDTO(node, [], new Map(), undefined)

    expect(dto.applyToGraph).toBeUndefined()
  })
})

describe("ExecutableNodeDTO Path-Based IDs", () => {
  it("should generate simple ID for root node", () => {
    const graph = new LGraph()
    const node = new LGraphNode("Root Node")
    node.id = 5
    graph.add(node)

    const dto = new ExecutableNodeDTO(node, [], new Map(), undefined)

    expect(dto.id).toBe("5")
  })

  it("should generate path-based ID for nested node", () => {
    const graph = new LGraph()
    const node = new LGraphNode("Nested Node")
    node.id = 3
    graph.add(node)
    const path = ["1", "2"] as const

    const dto = new ExecutableNodeDTO(node, path, new Map(), undefined)

    expect(dto.id).toBe("1:2:3")
  })

  it("should handle deep nesting paths", () => {
    const graph = new LGraph()
    const node = new LGraphNode("Deep Node")
    node.id = 99
    graph.add(node)
    const path = ["1", "2", "3", "4", "5"] as const

    const dto = new ExecutableNodeDTO(node, path, new Map(), undefined)

    expect(dto.id).toBe("1:2:3:4:5:99")
  })

  it("should handle string and number IDs consistently", () => {
    const graph = new LGraph()
    const node1 = new LGraphNode("Node 1")
    node1.id = 10
    graph.add(node1)

    const node2 = new LGraphNode("Node 2")
    node2.id = 20
    graph.add(node2)

    const dto1 = new ExecutableNodeDTO(node1, ["5"], new Map(), undefined)
    const dto2 = new ExecutableNodeDTO(node2, ["5"], new Map(), undefined)

    expect(dto1.id).toBe("5:10")
    expect(dto2.id).toBe("5:20")
  })
})

describe("ExecutableNodeDTO Input Resolution", () => {
  it("should return undefined for unconnected inputs", () => {
    const graph = new LGraph()
    const node = new LGraphNode("Test Node")
    node.addInput("in", "number")
    graph.add(node)

    const dto = new ExecutableNodeDTO(node, [], new Map(), undefined)

    // Unconnected input should return undefined
    const resolved = dto.resolveInput(0)
    expect(resolved).toBeUndefined()
  })

  it("should throw for non-existent input slots", () => {
    const graph = new LGraph()
    const node = new LGraphNode("No Input Node")
    graph.add(node)

    const dto = new ExecutableNodeDTO(node, [], new Map(), undefined)

    // Should throw SlotIndexError for non-existent input
    expect(() => dto.resolveInput(0)).toThrow("No input found for flattened id")
  })

  it("should handle subgraph boundary inputs", () => {
    const subgraph = createTestSubgraph({
      inputs: [{ name: "input1", type: "number" }],
      nodeCount: 1,
    })
    const subgraphNode = createTestSubgraphNode(subgraph)

    // Get the inner node and create DTO
    const innerNode = subgraph.nodes[0]
    const dto = new ExecutableNodeDTO(innerNode, ["1"], new Map(), subgraphNode)

    // Should return undefined for unconnected input
    const resolved = dto.resolveInput(0)
    expect(resolved).toBeUndefined()
  })
})

describe("ExecutableNodeDTO Output Resolution", () => {
  it("should resolve outputs for simple nodes", () => {
    const graph = new LGraph()
    const node = new LGraphNode("Test Node")
    node.addOutput("out", "string")
    graph.add(node)

    const dto = new ExecutableNodeDTO(node, [], new Map(), undefined)

    // resolveOutput requires type and visited parameters
    const resolved = dto.resolveOutput(0, "string", new Set())

    expect(resolved).toBeDefined()
    expect(resolved?.node).toBe(dto)
    expect(resolved?.origin_id).toBe(dto.id)
    expect(resolved?.origin_slot).toBe(0)
  })

  it("should resolve cross-boundary outputs in subgraphs", () => {
    const subgraph = createTestSubgraph({
      outputs: [{ name: "output1", type: "string" }],
      nodeCount: 1,
    })
    const subgraphNode = createTestSubgraphNode(subgraph)

    // Get the inner node and create DTO
    const innerNode = subgraph.nodes[0]
    const dto = new ExecutableNodeDTO(innerNode, ["1"], new Map(), subgraphNode)

    const resolved = dto.resolveOutput(0, "string", new Set())

    expect(resolved).toBeDefined()
  })

  it("should handle nodes with no outputs", () => {
    const graph = new LGraph()
    const node = new LGraphNode("No Output Node")
    graph.add(node)

    const dto = new ExecutableNodeDTO(node, [], new Map(), undefined)

    // For regular nodes, resolveOutput returns the node itself even if no outputs
    // This tests the current implementation behavior
    const resolved = dto.resolveOutput(0, "string", new Set())
    expect(resolved).toBeDefined()
    expect(resolved?.node).toBe(dto)
    expect(resolved?.origin_slot).toBe(0)
  })
})

describe("ExecutableNodeDTO Properties", () => {
  it("should provide access to basic properties", () => {
    const graph = new LGraph()
    const node = new LGraphNode("Test Node")
    node.id = 42
    node.addInput("input", "number")
    node.addOutput("output", "string")
    graph.add(node)

    const dto = new ExecutableNodeDTO(node, ["1", "2"], new Map(), undefined)

    expect(dto.id).toBe("1:2:42")
    expect(dto.type).toBe(node.type)
    expect(dto.title).toBe(node.title)
    expect(dto.mode).toBe(node.mode)
    expect(dto.isVirtualNode).toBe(node.isVirtualNode)
  })

  it("should provide access to input information", () => {
    const graph = new LGraph()
    const node = new LGraphNode("Test Node")
    node.addInput("testInput", "number")
    node.inputs[0].link = 999 // Simulate connection
    graph.add(node)

    const dto = new ExecutableNodeDTO(node, [], new Map(), undefined)

    expect(dto.inputs).toBeDefined()
    expect(dto.inputs).toHaveLength(1)
    expect(dto.inputs[0].name).toBe("testInput")
    expect(dto.inputs[0].type).toBe("number")
    expect(dto.inputs[0].linkId).toBe(999)
  })
})

describe("ExecutableNodeDTO Memory Efficiency", () => {
  it("should create lightweight objects", () => {
    const graph = new LGraph()
    const node = new LGraphNode("Test Node")
    node.addInput("in1", "number")
    node.addInput("in2", "string")
    node.addOutput("out1", "number")
    node.addOutput("out2", "string")
    graph.add(node)

    const dto = new ExecutableNodeDTO(node, ["1"], new Map(), undefined)

    // DTO should be lightweight - only essential properties
    expect(dto.node).toBe(node) // Reference, not copy
    expect(dto.subgraphNodePath).toEqual(["1"]) // Reference to path
    expect(dto.inputs).toHaveLength(2) // Copied input data only

    // Should not duplicate heavy node data
    expect(dto.hasOwnProperty("outputs")).toBe(false) // Outputs not copied
    expect(dto.hasOwnProperty("widgets")).toBe(false) // Widgets not copied
  })

  it("should handle disposal without memory leaks", () => {
    const graph = new LGraph()
    const nodes: ExecutableNodeDTO[] = []

    // Create DTOs
    for (let i = 0; i < 100; i++) {
      const node = new LGraphNode(`Node ${i}`)
      node.id = i
      graph.add(node)
      const dto = new ExecutableNodeDTO(node, ["parent"], new Map(), undefined)
      nodes.push(dto)
    }

    expect(nodes).toHaveLength(100)

    // Clear references
    nodes.length = 0

    // DTOs should be eligible for garbage collection
    // (No explicit disposal needed - they're lightweight wrappers)
    expect(nodes).toHaveLength(0)
  })

  it("should not retain unnecessary references", () => {
    const subgraph = createTestSubgraph({ nodeCount: 1 })
    const subgraphNode = createTestSubgraphNode(subgraph)
    const innerNode = subgraph.nodes[0]

    const dto = new ExecutableNodeDTO(innerNode, ["1"], new Map(), subgraphNode)

    // Should hold necessary references
    expect(dto.node).toBe(innerNode)
    expect(dto.subgraphNode).toBe(subgraphNode)
    expect(dto.graph).toBe(innerNode.graph)

    // Should not hold heavy references that prevent GC
    expect(dto.hasOwnProperty("parentGraph")).toBe(false)
    expect(dto.hasOwnProperty("rootGraph")).toBe(false)
  })
})

describe("ExecutableNodeDTO Integration", () => {
  it("should work with SubgraphNode flattening", () => {
    const subgraph = createTestSubgraph({ nodeCount: 3 })
    const subgraphNode = createTestSubgraphNode(subgraph)

    const flattened = subgraphNode.getInnerNodes(new Map())

    expect(flattened).toHaveLength(3)
    expect(flattened[0]).toBeInstanceOf(ExecutableNodeDTO)
    expect(flattened[0].id).toMatch(/^1:\d+$/)
  })

  it.skip("should handle nested subgraph flattening", () => {
    // FIXME: Test fails after rebase - nested structure setup needs review
    const nested = createNestedSubgraphs({
      depth: 3,
      nodesPerLevel: 2,
    })

    const rootSubgraphNode = nested.subgraphNodes[0]
    const flattened = rootSubgraphNode.getInnerNodes(new Map())

    // Should have DTOs for all nested nodes
    expect(flattened.length).toBeGreaterThan(0)

    // Should have proper hierarchical IDs
    const hierarchicalIds = flattened.filter(dto => dto.id.includes(":"))
    expect(hierarchicalIds.length).toBeGreaterThan(0)
  })

  it("should preserve original node properties through DTO", () => {
    const graph = new LGraph()
    const originalNode = new LGraphNode("Original")
    originalNode.id = 123
    originalNode.addInput("test", "number")
    originalNode.properties = { value: 42 }
    graph.add(originalNode)

    const dto = new ExecutableNodeDTO(originalNode, ["parent"], new Map(), undefined)

    // DTO should provide access to original node properties
    expect(dto.node.id).toBe(123)
    expect(dto.node.inputs).toHaveLength(1)
    expect(dto.node.properties.value).toBe(42)

    // But DTO ID should be path-based
    expect(dto.id).toBe("parent:123")
  })

  it("should handle execution context correctly", () => {
    const subgraph = createTestSubgraph({ nodeCount: 1 })
    const subgraphNode = createTestSubgraphNode(subgraph, { id: 99 })
    const innerNode = subgraph.nodes[0]
    innerNode.id = 55

    const dto = new ExecutableNodeDTO(innerNode, ["99"], new Map(), subgraphNode)

    // DTO provides execution context
    expect(dto.id).toBe("99:55") // Path-based execution ID
    expect(dto.node.id).toBe(55) // Original node ID preserved
    expect(dto.subgraphNode?.id).toBe(99) // Subgraph context
  })
})

describe("ExecutableNodeDTO Scale Testing", () => {
  it("should create DTOs at scale", () => {
    const graph = new LGraph()
    const startTime = performance.now()
    const dtos: ExecutableNodeDTO[] = []

    // Create DTOs to test performance
    for (let i = 0; i < 1000; i++) {
      const node = new LGraphNode(`Node ${i}`)
      node.id = i
      node.addInput("in", "number")
      graph.add(node)

      const dto = new ExecutableNodeDTO(node, ["parent"], new Map(), undefined)
      dtos.push(dto)
    }

    const endTime = performance.now()
    const duration = endTime - startTime

    expect(dtos).toHaveLength(1000)
    // Test deterministic properties instead of flaky timing
    expect(dtos[0].id).toBe("parent:0")
    expect(dtos[999].id).toBe("parent:999")
    expect(dtos.every((dto, i) => dto.id === `parent:${i}`)).toBe(true)

    console.log(`Created 1000 DTOs in ${duration.toFixed(2)}ms`)
  })

  it("should handle complex path generation correctly", () => {
    const graph = new LGraph()
    const node = new LGraphNode("Deep Node")
    node.id = 999
    graph.add(node)

    // Test deterministic path generation behavior
    const testCases = [
      { depth: 1, expectedId: "1:999" },
      { depth: 3, expectedId: "1:2:3:999" },
      { depth: 5, expectedId: "1:2:3:4:5:999" },
      { depth: 10, expectedId: "1:2:3:4:5:6:7:8:9:10:999" },
    ]

    for (const testCase of testCases) {
      const path = Array.from({ length: testCase.depth }, (_, i) => (i + 1).toString())
      const dto = new ExecutableNodeDTO(node, path, new Map(), undefined)
      expect(dto.id).toBe(testCase.expectedId)
    }
  })
})