package legacydata

import (
	"strconv"
	"testing"
	"time"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestTimeRange(t *testing.T) {
	now := time.Now()

	t.Run("Can parse 5m, now", func(t *testing.T) {
		tr := DataTimeRange{
			From: "5m",
			To:   "now",
			Now:  now,
		}

		t.Run("5m ago ", func(t *testing.T) {
			fiveMinAgo, err := time.ParseDuration("-5m")
			require.Nil(t, err)
			expected := now.Add(fiveMinAgo)

			res, err := tr.ParseFrom()
			require.Nil(t, err)
			require.Equal(t, expected.Unix(), res.Unix())
		})

		t.Run("now ", func(t *testing.T) {
			res, err := tr.ParseTo()
			require.Nil(t, err)
			require.Equal(t, now.Unix(), res.Unix())
		})
	})

	t.Run("Can parse 5h, now-10m", func(t *testing.T) {
		tr := DataTimeRange{
			From: "5h",
			To:   "now-10m",
			Now:  now,
		}

		t.Run("5h ago ", func(t *testing.T) {
			fiveHourAgo, err := time.ParseDuration("-5h")
			require.Nil(t, err)
			expected := now.Add(fiveHourAgo)

			res, err := tr.ParseFrom()
			require.Nil(t, err)
			require.Equal(t, expected.Unix(), res.Unix())
		})

		t.Run("now-10m ", func(t *testing.T) {
			tenMinAgo, err := time.ParseDuration("-10m")
			require.Nil(t, err)
			expected := now.Add(tenMinAgo)
			res, err := tr.ParseTo()
			require.Nil(t, err)
			require.Equal(t, expected.Unix(), res.Unix())
		})
	})

	now, err := time.Parse(time.RFC3339Nano, "2020-03-26T15:12:56.000Z")
	require.Nil(t, err)
	t.Run("Can parse now-1M/M, now-1M/M", func(t *testing.T) {
		tr := DataTimeRange{
			From: "now-1M/M",
			To:   "now-1M/M",
			Now:  now,
		}

		t.Run("from now-1M/M ", func(t *testing.T) {
			expected, err := time.Parse(time.RFC3339Nano, "2020-02-01T00:00:00.000Z")
			require.Nil(t, err)

			res, err := tr.ParseFrom()
			require.Nil(t, err)
			require.Equal(t, expected, res)
		})

		t.Run("to now-1M/M ", func(t *testing.T) {
			expected, err := time.Parse(time.RFC3339Nano, "2020-02-29T23:59:59.999Z")
			require.Nil(t, err)

			res, err := tr.ParseTo()
			require.Nil(t, err)
			require.Equal(t, expected, res)
		})
	})

	t.Run("Can parse now-3d, now+3w", func(t *testing.T) {
		tr := DataTimeRange{
			From: "now-3d",
			To:   "now+3w",
			Now:  now,
		}

		t.Run("now-3d ", func(t *testing.T) {
			expected, err := time.Parse(time.RFC3339Nano, "2020-03-23T15:12:56.000Z")
			require.Nil(t, err)

			res, err := tr.ParseFrom()
			require.Nil(t, err)
			require.Equal(t, expected, res)
		})

		t.Run("now+3w ", func(t *testing.T) {
			expected, err := time.Parse(time.RFC3339Nano, "2020-04-16T15:12:56.000Z")
			require.Nil(t, err)

			res, err := tr.ParseTo()
			require.Nil(t, err)
			require.Equal(t, expected, res)
		})
	})

	t.Run("Can parse now/fy, now/fQ for 1994-02-26T14:00:00.000Z with fiscal year starting in July", func(t *testing.T) {
		tr := DataTimeRange{
			From: "now/fy",
			To:   "now/fQ",
			Now:  time.Date(1994, time.February, 26, 14, 0, 0, 0, time.UTC),
		}

		start, err := tr.ParseFrom(WithFiscalStartMonth(time.July))
		require.NoError(t, err)
		assert.Equal(
			t,
			time.Date(1993, time.July, 1, 0, 0, 0, 0, time.UTC),
			start,
		)

		end, err := tr.ParseTo(WithFiscalStartMonth(time.July))
		require.NoError(t, err)
		assert.Equal(
			t,
			time.Date(1994, time.April, 1, 0, 0, 0, 0, time.UTC).Add(-time.Millisecond),
			end,
		)
	})

	t.Run("Can parse 1960-02-01T07:00:00.000Z, 1965-02-03T08:00:00.000Z", func(t *testing.T) {
		tr := DataTimeRange{
			From: "1960-02-01T07:00:00.000Z",
			To:   "1965-02-03T08:00:00.000Z",
			Now:  now,
		}

		t.Run("1960-02-01T07:00:00.000Z ", func(t *testing.T) {
			expected, err := time.Parse(time.RFC3339Nano, "1960-02-01T07:00:00.000Z")
			require.Nil(t, err)

			res, err := tr.ParseFrom()
			require.Nil(t, err)
			require.Equal(t, expected, res)
		})

		t.Run("1965-02-03T08:00:00.000Z ", func(t *testing.T) {
			expected, err := time.Parse(time.RFC3339Nano, "1965-02-03T08:00:00.000Z")
			require.Nil(t, err)

			res, err := tr.ParseTo()
			require.Nil(t, err)
			require.Equal(t, expected, res)
		})
	})

	t.Run("Can parse negative unix epochs", func(t *testing.T) {
		from := time.Date(1960, 2, 1, 7, 0, 0, 0, time.UTC)
		to := time.Date(1965, 2, 3, 8, 0, 0, 0, time.UTC)
		tr := NewDataTimeRange(strconv.FormatInt(from.UnixNano()/int64(time.Millisecond), 10), strconv.FormatInt(to.UnixNano()/int64(time.Millisecond), 10))

		res, err := tr.ParseFrom()
		require.Nil(t, err)
		require.True(t, from.Equal(res))

		res, err = tr.ParseTo()
		require.Nil(t, err)
		require.True(t, to.Equal(res))
	})

	t.Run("can parse unix epochs", func(t *testing.T) {
		var err error
		tr := DataTimeRange{
			From: "1474973725473",
			To:   "1474975757930",
			Now:  now,
		}

		res, err := tr.ParseFrom()
		require.Nil(t, err)
		require.Equal(t, int64(1474973725473), res.UnixNano()/int64(time.Millisecond))

		res, err = tr.ParseTo()
		require.Nil(t, err)
		require.Equal(t, int64(1474975757930), res.UnixNano()/int64(time.Millisecond))
	})

	t.Run("Cannot parse asdf", func(t *testing.T) {
		var err error
		tr := DataTimeRange{
			From: "asdf",
			To:   "asdf",
			Now:  now,
		}

		_, err = tr.ParseFrom()
		require.Error(t, err)

		_, err = tr.ParseTo()
		require.Error(t, err)
	})

	now, err = time.Parse(time.RFC3339Nano, "2020-07-26T15:12:56.000Z")
	require.Nil(t, err)

	t.Run("Can parse now-1M/M, now-1M/M with America/Chicago timezone", func(t *testing.T) {
		tr := DataTimeRange{
			From: "now-1M/M",
			To:   "now-1M/M",
			Now:  now,
		}
		location, err := time.LoadLocation("America/Chicago")
		require.Nil(t, err)

		t.Run("from now-1M/M ", func(t *testing.T) {
			expected, err := time.Parse(time.RFC3339Nano, "2020-06-01T00:00:00.000-05:00")
			require.Nil(t, err)

			res, err := tr.ParseFrom(WithLocation(location))
			require.Nil(t, err)
			require.True(t, expected.Equal(res))
		})

		t.Run("to now-1M/M ", func(t *testing.T) {
			expected, err := time.Parse(time.RFC3339Nano, "2020-06-30T23:59:59.999-05:00")
			require.Nil(t, err)

			res, err := tr.ParseTo(WithLocation(location))
			require.Nil(t, err)
			require.True(t, expected.Equal(res))
		})
	})

	t.Run("Can parse now-3h, now+2h with America/Chicago timezone", func(t *testing.T) {
		tr := DataTimeRange{
			From: "now-3h",
			To:   "now+2h",
			Now:  now,
		}
		location, err := time.LoadLocation("America/Chicago")
		require.Nil(t, err)

		t.Run("now-3h ", func(t *testing.T) {
			expected, err := time.Parse(time.RFC3339Nano, "2020-07-26T07:12:56.000-05:00")
			require.Nil(t, err)

			res, err := tr.ParseFrom(WithLocation(location))
			require.Nil(t, err)
			require.True(t, expected.Equal(res))
		})

		t.Run("now+2h ", func(t *testing.T) {
			expected, err := time.Parse(time.RFC3339Nano, "2020-07-26T12:12:56.000-05:00")
			require.Nil(t, err)

			res, err := tr.ParseTo(WithLocation(location))
			require.Nil(t, err)
			require.True(t, expected.Equal(res))
		})
	})

	t.Run("Can parse now-1w/w, now-1w/w without timezone and week start on Monday", func(t *testing.T) {
		tr := DataTimeRange{
			From: "now-1w/w",
			To:   "now-1w/w",
			Now:  now,
		}
		weekstart := time.Monday
		require.Nil(t, err)

		t.Run("from now-1w/w ", func(t *testing.T) {
			expected, err := time.Parse(time.RFC3339Nano, "2020-07-13T00:00:00.000Z")
			require.Nil(t, err)

			res, err := tr.ParseFrom(WithWeekstart(weekstart))
			require.Nil(t, err)
			require.True(t, expected.Equal(res))
		})

		t.Run("to now-1w/w ", func(t *testing.T) {
			expected, err := time.Parse(time.RFC3339Nano, "2020-07-19T23:59:59.999Z")
			require.Nil(t, err)

			res, err := tr.ParseTo(WithWeekstart(weekstart))
			require.Nil(t, err)
			require.True(t, expected.Equal(res))
		})
	})

	t.Run("Can parse now-1w/w, now-1w/w with America/Chicago timezone and week start on Monday", func(t *testing.T) {
		tr := DataTimeRange{
			From: "now-1w/w",
			To:   "now-1w/w",
			Now:  now,
		}
		weekstart := time.Monday
		location, err := time.LoadLocation("America/Chicago")
		require.Nil(t, err)

		t.Run("from now-1w/w ", func(t *testing.T) {
			expected, err := time.Parse(time.RFC3339Nano, "2020-07-13T00:00:00.000-05:00")
			require.Nil(t, err)

			res, err := tr.ParseFrom(WithLocation(location), WithWeekstart(weekstart))
			require.Nil(t, err)
			require.True(t, expected.Equal(res))
		})

		t.Run("to now-1w/w ", func(t *testing.T) {
			expected, err := time.Parse(time.RFC3339Nano, "2020-07-19T23:59:59.999-05:00")
			require.Nil(t, err)

			res, err := tr.ParseTo(WithLocation(location), WithWeekstart(weekstart))
			require.Nil(t, err)
			require.True(t, expected.Equal(res))
		})
	})

	t.Run("Can parse now-1w/w, now-1w/w with America/Chicago timezone and week start on Sunday", func(t *testing.T) {
		tr := DataTimeRange{
			From: "now-1w/w",
			To:   "now-1w/w",
			Now:  now,
		}
		weekstart := time.Sunday
		location, err := time.LoadLocation("America/Chicago")
		require.Nil(t, err)

		t.Run("from now-1w/w ", func(t *testing.T) {
			expected, err := time.Parse(time.RFC3339Nano, "2020-07-19T00:00:00.000-05:00")
			require.Nil(t, err)

			res, err := tr.ParseFrom(WithLocation(location), WithWeekstart(weekstart))
			require.Nil(t, err)
			require.True(t, expected.Equal(res))
		})

		t.Run("to now-1w/w ", func(t *testing.T) {
			expected, err := time.Parse(time.RFC3339Nano, "2020-07-25T23:59:59.999-05:00")
			require.Nil(t, err)

			res, err := tr.ParseTo(WithLocation(location), WithWeekstart(weekstart))
			require.Nil(t, err)
			require.True(t, expected.Equal(res))
		})
	})

	t.Run("Can parse now-1w/w, now-1w/w with America/Chicago timezone and week start on Saturday", func(t *testing.T) {
		tr := DataTimeRange{
			From: "now-1w/w",
			To:   "now-1w/w",
			Now:  now,
		}
		weekstart := time.Saturday
		location, err := time.LoadLocation("America/Chicago")
		require.Nil(t, err)

		t.Run("from now-1w/w ", func(t *testing.T) {
			expected, err := time.Parse(time.RFC3339Nano, "2020-07-18T00:00:00.000-05:00")
			require.Nil(t, err)

			res, err := tr.ParseFrom(WithLocation(location), WithWeekstart(weekstart))
			require.Nil(t, err)
			require.True(t, expected.Equal(res))
		})

		t.Run("to now-1w/w ", func(t *testing.T) {
			expected, err := time.Parse(time.RFC3339Nano, "2020-07-24T23:59:59.999-05:00")
			require.Nil(t, err)

			res, err := tr.ParseTo(WithLocation(location), WithWeekstart(weekstart))
			require.Nil(t, err)
			require.True(t, expected.Equal(res))
		})
	})
}