import reducer from 'src/data_explorer/reducers/queryConfigs'
import defaultQueryConfig from 'src/utils/defaultQueryConfig'
import {
  chooseNamespace,
  chooseMeasurement,
  toggleField,
  applyFuncsToField,
  chooseTag,
  groupByTag,
  groupByTime,
  toggleTagAcceptance,
  updateRawQuery,
  editQueryStatus,
} from 'src/data_explorer/actions/view'

const fakeAddQueryAction = (panelID, queryID) => {
  return {
    type: 'ADD_QUERY',
    payload: {panelID, queryID},
  }
}

function buildInitialState(queryId, params) {
  return Object.assign({}, defaultQueryConfig(queryId), params)
}

describe('Chronograf.Reducers.queryConfig', () => {
  const queryId = 123

  it('can add a query', () => {
    const state = reducer({}, fakeAddQueryAction('blah', queryId))

    const actual = state[queryId]
    const expected = defaultQueryConfig(queryId)
    expect(actual).to.deep.equal(expected)
  })

  describe('choosing db, rp, and measurement', () => {
    let state
    beforeEach(() => {
      state = reducer({}, fakeAddQueryAction('any', queryId))
    })

    it('sets the db and rp', () => {
      const newState = reducer(state, chooseNamespace(queryId, {
        database: 'telegraf',
        retentionPolicy: 'monitor',
      }))

      expect(newState[queryId].database).to.equal('telegraf')
      expect(newState[queryId].retentionPolicy).to.equal('monitor')
    })

    it('sets the measurement', () => {
      const newState = reducer(state, chooseMeasurement(queryId, 'mem'))

      expect(newState[queryId].measurement).to.equal('mem')
    })
  })

  describe('a query has measurements and fields', () => {
    let state
    beforeEach(() => {
      const one = reducer({}, fakeAddQueryAction('any', queryId))
      const two = reducer(one, chooseNamespace(queryId, {
        database: '_internal',
        retentionPolicy: 'daily',
      }))
      const three = reducer(two, chooseMeasurement(queryId, 'disk'))
      state = reducer(three, toggleField(queryId, {field: 'a great field', funcs: []}))
    })

    describe('choosing a new namespace', () => {
      it('clears out the old measurement and fields', () => { // what about tags?
        expect(state[queryId].measurement).to.exist
        expect(state[queryId].fields.length).to.equal(1)

        const newState = reducer(state, chooseNamespace(queryId, {
          database: 'newdb',
          retentionPolicy: 'newrp',
        }))

        expect(newState[queryId].measurement).not.to.exist
        expect(newState[queryId].fields.length).to.equal(0)
      })
    })

    describe('choosing a new measurement', () => {
      it('leaves the namespace and clears out the old fields', () => { // what about tags?
        expect(state[queryId].fields.length).to.equal(1)

        const newState = reducer(state, chooseMeasurement(queryId, 'newmeasurement'))

        expect(state[queryId].database).to.equal(newState[queryId].database)
        expect(state[queryId].retentionPolicy).to.equal(newState[queryId].retentionPolicy)
        expect(newState[queryId].fields.length).to.equal(0)
      })
    })

    describe('when the query is part of a kapacitor rule', () => {
      it('only allows one field', () => {
        expect(state[queryId].fields.length).to.equal(1)

        const isKapacitorRule = true
        const newState = reducer(state, toggleField(queryId, {field: 'a different field', funcs: []}, isKapacitorRule))

        expect(newState[queryId].fields.length).to.equal(1)
        expect(newState[queryId].fields[0].field).to.equal('a different field')
      })
    })
  })

  describe('APPLY_FUNCS_TO_FIELD', () => {
    it('applies functions to a field without any existing functions', () => {
      const initialState = {
        [queryId]: {
          id: 123,
          database: 'db1',
          measurement: 'm1',
          fields: [
            {field: 'f1', funcs: ['fn1', 'fn2']},
            {field: 'f2', funcs: ['fn1']},
          ],
        },
      }
      const action = applyFuncsToField(queryId, {
        field: 'f1',
        funcs: ['fn3', 'fn4'],
      })

      const nextState = reducer(initialState, action)

      expect(nextState[queryId].fields).to.eql([
        {field: 'f1', funcs: ['fn3', 'fn4']},
        {field: 'f2', funcs: ['fn1']},
      ])
    })

    it('removes all functions and group by time when one field has no funcs applied', () => {
      const initialState = {
        [queryId]: {
          id: 123,
          database: 'db1',
          measurement: 'm1',
          fields: [
            {field: 'f1', funcs: ['fn1', 'fn2']},
            {field: 'f2', funcs: ['fn3', 'fn4']},
          ],
          groupBy: {
            time: '1m',
            tags: [],
          },
        },
      }

      const action = applyFuncsToField(queryId, {
        field: 'f1',
        funcs: [],
      })

      const nextState = reducer(initialState, action)

      expect(nextState[queryId].fields).to.eql([
        {field: 'f1', funcs: []},
        {field: 'f2', funcs: []},
      ])
      expect(nextState[queryId].groupBy.time).to.equal(null)
    })
  })

  describe('CHOOSE_TAG', () => {
    it('adds a tag key/value to the query', () => {
      const initialState = {
        [queryId]: buildInitialState(queryId, {
          tags: {
            k1: ['v0'],
            k2: ['foo'],
          },
        }),
      }
      const action = chooseTag(queryId, {
        key: 'k1',
        value: 'v1',
      })

      const nextState = reducer(initialState, action)

      expect(nextState[queryId].tags).to.eql({
        k1: ['v0', 'v1'],
        k2: ['foo'],
      })
    })

    it('creates a new entry if it\'s the first key', () => {
      const initialState = {
        [queryId]: buildInitialState(queryId, {
          tags: {},
        }),
      }
      const action = chooseTag(queryId, {
        key: 'k1',
        value: 'v1',
      })

      const nextState = reducer(initialState, action)

      expect(nextState[queryId].tags).to.eql({
        k1: ['v1'],
      })
    })

    it('removes a value that is already in the list', () => {
      const initialState = {
        [queryId]: buildInitialState(queryId, {
          tags: {
            k1: ['v1'],
          },
        }),
      }
      const action = chooseTag(queryId, {
        key: 'k1',
        value: 'v1',
      })

      const nextState = reducer(initialState, action)

      // TODO: this should probably remove the `k1` property entirely from the tags object
      expect(nextState[queryId].tags).to.eql({})
    })
  })

  describe('GROUP_BY_TAG', () => {
    it('adds a tag key/value to the query', () => {
      const initialState = {
        [queryId]: {
          id: 123,
          database: 'db1',
          measurement: 'm1',
          fields: [],
          tags: {},
          groupBy: {tags: [], time: null},
        },
      }
      const action = groupByTag(queryId, 'k1')

      const nextState = reducer(initialState, action)

      expect(nextState[queryId].groupBy).to.eql({
        time: null,
        tags: ['k1'],
      })
    })

    it('removes a tag if the given tag key is already in the GROUP BY list', () => {
      const initialState = {
        [queryId]: {
          id: 123,
          database: 'db1',
          measurement: 'm1',
          fields: [],
          tags: {},
          groupBy: {tags: ['k1'], time: null},
        },
      }
      const action = groupByTag(queryId, 'k1')

      const nextState = reducer(initialState, action)

      expect(nextState[queryId].groupBy).to.eql({
        time: null,
        tags: [],
      })
    })
  })

  describe('TOGGLE_TAG_ACCEPTANCE', () => {
    it('it toggles areTagsAccepted', () => {
      const initialState = {
        [queryId]: buildInitialState(queryId),
      }
      const action = toggleTagAcceptance(queryId)

      const nextState = reducer(initialState, action)

      expect(nextState[queryId].areTagsAccepted).to.equal(!initialState[queryId].areTagsAccepted)
    })
  })

  describe('GROUP_BY_TIME', () => {
    it('applys the appropriate group by time', () => {
      const time = '100y'
      const initialState = {
        [queryId]: buildInitialState(queryId),
      }

      const action = groupByTime(queryId, time)

      const nextState = reducer(initialState, action)

      expect(nextState[queryId].groupBy.time).to.equal(time)
    })
  })

  it('updates a query\'s raw text', () => {
    const initialState = {
      [queryId]: buildInitialState(queryId),
    }
    const text = 'foo'
    const action = updateRawQuery(queryId, text)

    const nextState = reducer(initialState, action)

    expect(nextState[queryId].rawText).to.equal('foo')
  })

  it('updates a query\'s raw status', () => {
    const initialState = {
      [queryId]: buildInitialState(queryId),
    }
    const status = 'your query was sweet'
    const action = editQueryStatus(queryId, status)

    const nextState = reducer(initialState, action)

    expect(nextState[queryId].status).to.equal(status)
  })
})