import { getLayersArray, topoSort } from 'src/services/theme_data/theme_data.service.js'

describe('getLayersArray', () => {
  const fixture = {
    layer1: null,
    layer2: 'layer1',
    layer3a: 'layer2',
    layer3b: 'layer2'
  }

  it('should expand layers properly (3b)', () => {
    const out = getLayersArray('layer3b', fixture)
    expect(out).to.eql(['layer1', 'layer2', 'layer3b'])
  })

  it('should expand layers properly (3a)', () => {
    const out = getLayersArray('layer3a', fixture)
    expect(out).to.eql(['layer1', 'layer2', 'layer3a'])
  })

  it('should expand layers properly (2)', () => {
    const out = getLayersArray('layer2', fixture)
    expect(out).to.eql(['layer1', 'layer2'])
  })

  it('should expand layers properly (1)', () => {
    const out = getLayersArray('layer1', fixture)
    expect(out).to.eql(['layer1'])
  })
})

describe('topoSort', () => {
  const fixture1 = {
    layerA: [],
    layer1A: ['layerA'],
    layer2A: ['layer1A'],
    layerB: [],
    layer1B: ['layerB'],
    layer2B: ['layer1B'],
    layer3AB: ['layer2B', 'layer2A']
  }

  // Same thing but messed up order
  const fixture2 = {
    layer1A: ['layerA'],
    layer1B: ['layerB'],
    layer2A: ['layer1A'],
    layerB: [],
    layer3AB: ['layer2B', 'layer2A'],
    layer2B: ['layer1B'],
    layerA: []
  }

  it('should make a topologically sorted array', () => {
    const out = topoSort(fixture1, (node, inheritance) => inheritance[node])
    // This basically checks all ordering that matters
    expect(out.indexOf('layerA')).to.be.below(out.indexOf('layer1A'))
    expect(out.indexOf('layer1A')).to.be.below(out.indexOf('layer2A'))
    expect(out.indexOf('layerB')).to.be.below(out.indexOf('layer1B'))
    expect(out.indexOf('layer1B')).to.be.below(out.indexOf('layer2B'))
    expect(out.indexOf('layer2A')).to.be.below(out.indexOf('layer3AB'))
    expect(out.indexOf('layer2B')).to.be.below(out.indexOf('layer3AB'))
  })

  it('order in object shouldn\'t matter', () => {
    const out = topoSort(fixture2, (node, inheritance) => inheritance[node])
    // This basically checks all ordering that matters
    expect(out.indexOf('layerA')).to.be.below(out.indexOf('layer1A'))
    expect(out.indexOf('layer1A')).to.be.below(out.indexOf('layer2A'))
    expect(out.indexOf('layerB')).to.be.below(out.indexOf('layer1B'))
    expect(out.indexOf('layer1B')).to.be.below(out.indexOf('layer2B'))
    expect(out.indexOf('layer2A')).to.be.below(out.indexOf('layer3AB'))
    expect(out.indexOf('layer2B')).to.be.below(out.indexOf('layer3AB'))
  })

  it('dependentless nodes should be first', () => {
    const out = topoSort(fixture2, (node, inheritance) => inheritance[node])
    // This basically checks all ordering that matters
    expect(out.indexOf('layerA')).to.eql(0)
    expect(out.indexOf('layerB')).to.eql(1)
  })

  it('ignores cyclic dependencies', () => {
    const out = topoSort({ a: 'b', b: 'a', c: 'a' }, (node, inheritance) => [inheritance[node]])
    expect(out.indexOf('a')).to.be.below(out.indexOf('c'))
  })
})