import { describe, expect, it } from 'vitest'
import { nextTick } from 'vue'
import { mount } from '@vue/test-utils'
import WorkflowCanvas from '@/views/system/workflow/designer/WorkflowCanvas.vue'

// jsdom 不实现 SVG 测量，LogicFlow 的节点文本（autoWrap）会用到
if (typeof SVGElement !== 'undefined' && !SVGElement.prototype.getBBox) {
  SVGElement.prototype.getBBox = () => ({ x: 0, y: 0, width: 0, height: 0 })
}

/** 一个坐标明显重叠的节点 */
function stackedNode(nodeKey, nodeType, name) {
  return { nodeKey, nodeType, name, x: 300, y: 300, config: {}, actorRules: [] }
}

/** 三个节点全叠在同一个坐标上，布局后应该被拉开成纵向流程 */
function messyDraft() {
  return {
    schemaVersion: 1,
    definitionId: 'expense_approval',
    name: '费用报销审批',
    nodes: [
      stackedNode('start', 'start', '开始'),
      stackedNode('user_task_1', 'user_task', '部门负责人审批'),
      stackedNode('end', 'end', '结束'),
    ],
    edges: [
      { edgeKey: 'edge_1', from: 'start', to: 'user_task_1', name: '', condition: null },
      { edgeKey: 'edge_2', from: 'user_task_1', to: 'end', name: '', condition: null },
    ],
  }
}

describe('画布一键整理（@logicflow/layout 的 dagre 插件）', () => {
  it('把重叠节点按纵向流程拉开，并把新坐标回报给上层', async () => {
    const wrapper = mount(WorkflowCanvas, {
      props: { draft: messyDraft() },
      attachTo: document.body,
    })
    await nextTick()

    const changed = wrapper.vm.autoLayout()
    expect(changed).toBe(true)

    // 布局结果必须回报给上层，否则草稿里的 x/y 还是旧的
    const emitted = wrapper.emitted('graph-change')
    expect(emitted).toBeTruthy()
    const graph = emitted[emitted.length - 1][0]
    const byId = Object.fromEntries(graph.nodes.map((item) => [item.id, item]))

    // 纵向（rankdir: TB）：开始在上、结束在下，且三个节点不再重叠
    expect(byId.start.y).toBeLessThan(byId.user_task_1.y)
    expect(byId.user_task_1.y).toBeLessThan(byId.end.y)
    expect(new Set(graph.nodes.map((item) => `${item.x},${item.y}`)).size).toBe(3)

    wrapper.unmount()
  })

  it('布局只改坐标：节点与连线的编码、拓扑原样保留', async () => {
    const wrapper = mount(WorkflowCanvas, {
      props: { draft: messyDraft() },
      attachTo: document.body,
    })
    await nextTick()
    wrapper.vm.autoLayout()

    const emitted = wrapper.emitted('graph-change')
    const graph = emitted[emitted.length - 1][0]
    // 编码稳定，上层才能按 nodeKey / edgeKey 回填审批人与条件
    expect(graph.nodes.map((item) => item.id).toSorted()).toEqual(['end', 'start', 'user_task_1'])
    expect(graph.edges.map((item) => item.id).toSorted()).toEqual(['edge_1', 'edge_2'])
    expect(graph.edges.map((item) => [item.sourceNodeId, item.targetNodeId])).toEqual([
      ['start', 'user_task_1'],
      ['user_task_1', 'end'],
    ])

    wrapper.unmount()
  })
})

/** 派发一个带 ctrl 的按键（LogicFlow 内置快捷键没有剪切，这条我们自己监听） */
function pressCtrl(target, key) {
  target.dispatchEvent(new KeyboardEvent('keydown', { key, ctrlKey: true, bubbles: true, cancelable: true }))
}

/** 派发一个不带修饰键的按键（删除） */
function pressKey(target, key) {
  target.dispatchEvent(new KeyboardEvent('keydown', { key, bubbles: true, cancelable: true }))
}

describe('画布快捷键：剪切（ctrl+x）', () => {
  it('删掉选中节点，与它相连的边一并消失', async () => {
    const wrapper = mount(WorkflowCanvas, {
      props: { draft: messyDraft() },
      attachTo: document.body,
    })
    await nextTick()

    wrapper.vm.focusNode('user_task_1')
    await nextTick()
    pressCtrl(wrapper.find('.workflow-canvas').element, 'x')
    await nextTick()

    const graph = wrapper.emitted('graph-change').at(-1)[0]
    expect(graph.nodes.map((item) => item.id)).toEqual(['start', 'end'])
    expect(graph.edges).toEqual([])

    wrapper.unmount()
  })

  it('没有选中元素时不动画布', async () => {
    const wrapper = mount(WorkflowCanvas, {
      props: { draft: messyDraft() },
      attachTo: document.body,
    })
    await nextTick()

    pressCtrl(wrapper.find('.workflow-canvas').element, 'x')
    await nextTick()

    expect(wrapper.emitted('graph-change')).toBeUndefined()

    wrapper.unmount()
  })

  it('焦点不在画布上也能连着剪（删完一次不用再点画布）', async () => {
    const wrapper = mount(WorkflowCanvas, {
      props: { draft: messyDraft() },
      attachTo: document.body,
    })
    await nextTick()

    // 事件从 body 冒泡：快捷键监听在 document 上，不受画布焦点影响
    wrapper.vm.focusNode('user_task_1')
    await nextTick()
    pressCtrl(document.body, 'x')
    await nextTick()

    wrapper.vm.focusNode('end')
    await nextTick()
    pressCtrl(document.body, 'x')
    await nextTick()

    const graph = wrapper.emitted('graph-change').at(-1)[0]
    expect(graph.nodes.map((item) => item.id)).toEqual(['start'])

    wrapper.unmount()
  })

  it('焦点不在画布上时，内置的复制/粘贴/删除照样能用', async () => {
    const wrapper = mount(WorkflowCanvas, {
      props: { draft: messyDraft() },
      attachTo: document.body,
    })
    await nextTick()

    wrapper.vm.focusNode('user_task_1')
    await nextTick()
    pressCtrl(document.body, 'c')
    await nextTick()
    pressCtrl(document.body, 'v')
    await nextTick()

    let graph = wrapper.emitted('graph-change').at(-1)[0]
    expect(graph.nodes.length).toBe(4)

    pressKey(document.body, 'Backspace')
    await nextTick()

    graph = wrapper.emitted('graph-change').at(-1)[0]
    expect(graph.nodes.length).toBe(3)

    wrapper.unmount()
  })
})