package geohash

import (
	"testing"
	"testing/quick"
)

func TestInterleaving(t *testing.T) {
	cases := []struct {
		x, y uint32
		X    uint64
	}{
		{0x00000000, 0x00000000, 0x0000000000000000},
		{0xffffffff, 0x00000000, 0x5555555555555555},
		{0x789e22e9, 0x8ed4182e, 0x95e8e37406845ce9},
		{0xb96346bb, 0xf8a80f02, 0xefc19c8510be454d},
		{0xa1dfc6c2, 0x01c886f9, 0x4403f1d5d03cfa86},
		{0xfb59e296, 0xad2c6c02, 0xdde719e17ca4411c},
		{0x94e0bbf2, 0xb520e8b2, 0xcb325c00edc5df0c},
		{0x1638ca5f, 0x5e16a514, 0x23bc0768d8661375},
		{0xe15bbbf7, 0x0f6bf376, 0x54ab39cfef4f7f3d},
		{0x06a476a7, 0x94f35ec7, 0x8234ee1a37bce43f},
	}
	for _, c := range cases {
		res := interleave(c.x, c.y)
		if c.X != res {
			t.Errorf("incorrect interleave result")
		}

		x, y := deinterleave(c.X)
		if c.x != x || c.y != y {
			t.Errorf("incorrect deinterleave result")
		}
	}
}

func TestBase32Decode(t *testing.T) {
	x := base32encoding.Decode("ezs42")
	if 0xdfe082 != x {
		t.Errorf("incorrect base64 decoding")
	}
}

func TestBase32Encode(t *testing.T) {
	s := base32encoding.Encode(0xdfe082)
	if "0000000ezs42" != s {
		t.Errorf("incorrect base64 encoding")
	}
}

func TestBoxRound(t *testing.T) {
	f := func() bool {
		b := RandomBox()
		lat, lng := b.Round()
		return b.Contains(lat, lng)
	}
	if err := quick.Check(f, nil); err != nil {
		t.Error(err)
	}
}

func TestBoxCenter(t *testing.T) {
	b := Box{
		MinLat: 1,
		MaxLat: 2,
		MinLng: 3,
		MaxLng: 4,
	}
	lat, lng := b.Center()
	if 1.5 != lat || 3.5 != lng {
		t.Errorf("incorrect box center")
	}
}

func TestBoxContains(t *testing.T) {
	b := Box{
		MinLat: 1,
		MaxLat: 2,
		MinLng: 3,
		MaxLng: 4,
	}
	cases := []struct {
		lat, lng float64
		expect   bool
	}{
		{1.5, 3.5, true},
		{0.5, 3.5, false},
		{7.0, 3.5, false},
		{1.5, 1.5, false},
		{1.5, 9.5, false},
		{1, 3, true},
		{1, 4, true},
		{2, 3, true},
		{2, 4, true},
	}
	for _, c := range cases {
		if c.expect != b.Contains(c.lat, c.lng) {
			t.Errorf("contains %f,%f should be %t", c.lat, c.lng, c.expect)
		}
	}
}

func TestWikipediaExample(t *testing.T) {
	h := EncodeWithPrecision(42.6, -5.6, 5)
	if "ezs42" != h {
		t.Errorf("incorrect encoding")
	}
}

func TestLeadingZero(t *testing.T) {
	h := EncodeWithPrecision(-74.761330, -140.309714, 6)
	if 6 != len(h) {
		t.Errorf("incorrect geohash length")
	}
	if "0fsnxn" != h {
		t.Errorf("incorrect encoding")
	}
}

func TestNeighbors(t *testing.T) {
	for _, c := range neighborsTestCases {
		neighbors := Neighbors(c.hashStr)
		for i, neighbor := range neighbors {
			expected := c.hashStrNeighbors[i]
			if neighbor != expected {
				t.Errorf("actual: %v \n expected: %v\n", neighbors, c.hashStrNeighbors)
				break
			}
		}
	}
}

func TestNeighborsInt(t *testing.T) {
	cases := []struct {
		hash      uint64
		neighbors []uint64
	}{
		{
			hash: 6456360425798343065,
			neighbors: []uint64{
				6456360425798343068,
				6456360425798343070,
				6456360425798343067,
				6456360425798343066,
				6456360425798343064,
				6456360425798343058,
				6456360425798343059,
				6456360425798343062,
			},
		},
	}

	for _, c := range cases {
		neighbors := NeighborsInt(c.hash)
		for i, neighbor := range neighbors {
			expected := c.neighbors[i]
			if neighbor != c.neighbors[i] {
				t.Errorf("neighbor: %v does not match expected: %v", neighbor, expected)
			}
		}
	}
}

func TestNeighborsIntWithPrecision(t *testing.T) {
	for _, c := range neighborsTestCases {
		neighbors := NeighborsIntWithPrecision(c.hashInt, c.hashIntBitDepth)
		for i, neighbor := range neighbors {
			expected := c.hashIntNeighbors[i]
			if neighbor != expected {
				t.Errorf("actual: %v \n expected: %v\n", neighbors, c.hashIntNeighbors)
				break
			}
		}
	}
}

func TestNeighbor(t *testing.T) {
	c := neighborsTestCases[0]
	neighbor := Neighbor(c.hashStr, North)
	expected := c.hashStrNeighbors[North]
	if neighbor != expected {
		t.Errorf("actual: %v \n expected: %v\n", neighbor, expected)
	}
}

func TestNeighborInt(t *testing.T) {
	cases := []struct {
		hash         uint64
		neighborEast uint64
	}{
		{
			hash:         6456360425798343065,
			neighborEast: 6456360425798343067,
		},
	}

	for _, c := range cases {
		neighbor := NeighborInt(c.hash, East)
		expected := c.neighborEast
		if neighbor != expected {
			t.Errorf("actual: %v \n expected: %v\n", neighbor, expected)	
		}
	}
}

func TestNeighborIntWithPrecision(t *testing.T) {
	c := neighborsTestCases[0]
	neighbor := NeighborIntWithPrecision(c.hashInt, c.hashIntBitDepth, South)
	expected := c.hashIntNeighbors[South]
	if neighbor != expected {
		t.Errorf("actual: %v \n expected: %v\n", neighbor, expected)
	}
}