package maps_test

import (
	"fmt"
	"testing"

	"github.com/BattlesnakeOfficial/rules"
	"github.com/BattlesnakeOfficial/rules/maps"
	"github.com/stretchr/testify/require"
)

func TestStandardMapInterface(t *testing.T) {
	var _ maps.GameMap = maps.StandardMap{}
}

func TestStandardMapSetupBoard(t *testing.T) {
	m := maps.StandardMap{}
	settings := rules.Settings{}

	tests := []struct {
		name              string
		initialBoardState *rules.BoardState
		rand              rules.Rand

		expected *rules.BoardState
		err      error
	}{
		{
			"empty 7x7",
			rules.NewBoardState(7, 7),
			rules.MinRand,
			rules.NewBoardState(7, 7).WithFood([]rules.Point{{X: 3, Y: 3}}),
			nil,
		},
		{
			"not enough room for snakes 7x7",
			rules.NewBoardState(7, 7).WithSnakes(generateSnakes(17)),
			rules.MinRand,
			nil,
			rules.ErrorTooManySnakes,
		},
		{
			"not enough room for snakes 5x5",
			rules.NewBoardState(5, 5).WithSnakes(generateSnakes(14)),
			rules.MinRand,
			nil,
			rules.ErrorTooManySnakes,
		},
		{
			"full 11x11 min",
			rules.NewBoardState(11, 11).WithSnakes(generateSnakes(8)),
			rules.MinRand,
			rules.NewBoardState(11, 11).
				WithFood([]rules.Point{
					{X: 0, Y: 2},
					{X: 0, Y: 8},
					{X: 8, Y: 0},
					{X: 8, Y: 10},
					{X: 0, Y: 4},
					{X: 4, Y: 0},
					{X: 4, Y: 10},
					{X: 10, Y: 4},
					{X: 5, Y: 5},
				}).
				WithSnakes([]rules.Snake{
					{ID: "1", Body: []rules.Point{{X: 1, Y: 1}, {X: 1, Y: 1}, {X: 1, Y: 1}}, Health: 100},
					{ID: "2", Body: []rules.Point{{X: 1, Y: 9}, {X: 1, Y: 9}, {X: 1, Y: 9}}, Health: 100},
					{ID: "3", Body: []rules.Point{{X: 9, Y: 1}, {X: 9, Y: 1}, {X: 9, Y: 1}}, Health: 100},
					{ID: "4", Body: []rules.Point{{X: 9, Y: 9}, {X: 9, Y: 9}, {X: 9, Y: 9}}, Health: 100},
					{ID: "5", Body: []rules.Point{{X: 1, Y: 5}, {X: 1, Y: 5}, {X: 1, Y: 5}}, Health: 100},
					{ID: "6", Body: []rules.Point{{X: 5, Y: 1}, {X: 5, Y: 1}, {X: 5, Y: 1}}, Health: 100},
					{ID: "7", Body: []rules.Point{{X: 5, Y: 9}, {X: 5, Y: 9}, {X: 5, Y: 9}}, Health: 100},
					{ID: "8", Body: []rules.Point{{X: 9, Y: 5}, {X: 9, Y: 5}, {X: 9, Y: 5}}, Health: 100},
				}),
			nil,
		},
		{
			"full 11x11 max",
			rules.NewBoardState(11, 11).WithSnakes(generateSnakes(8)),
			rules.MaxRand,
			rules.NewBoardState(11, 11).
				WithFood([]rules.Point{
					{X: 6, Y: 0},
					{X: 6, Y: 10},
					{X: 10, Y: 6},
					{X: 0, Y: 6},
					{X: 2, Y: 10},
					{X: 10, Y: 2},
					{X: 10, Y: 8},
					{X: 2, Y: 0},
					{X: 5, Y: 5},
				}).
				WithSnakes([]rules.Snake{
					{ID: "1", Body: []rules.Point{{X: 5, Y: 1}, {X: 5, Y: 1}, {X: 5, Y: 1}}, Health: 100},
					{ID: "2", Body: []rules.Point{{X: 5, Y: 9}, {X: 5, Y: 9}, {X: 5, Y: 9}}, Health: 100},
					{ID: "3", Body: []rules.Point{{X: 9, Y: 5}, {X: 9, Y: 5}, {X: 9, Y: 5}}, Health: 100},
					{ID: "4", Body: []rules.Point{{X: 1, Y: 5}, {X: 1, Y: 5}, {X: 1, Y: 5}}, Health: 100},
					{ID: "5", Body: []rules.Point{{X: 1, Y: 9}, {X: 1, Y: 9}, {X: 1, Y: 9}}, Health: 100},
					{ID: "6", Body: []rules.Point{{X: 9, Y: 1}, {X: 9, Y: 1}, {X: 9, Y: 1}}, Health: 100},
					{ID: "7", Body: []rules.Point{{X: 9, Y: 9}, {X: 9, Y: 9}, {X: 9, Y: 9}}, Health: 100},
					{ID: "8", Body: []rules.Point{{X: 1, Y: 1}, {X: 1, Y: 1}, {X: 1, Y: 1}}, Health: 100},
				}),
			nil,
		},
	}
	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			nextBoardState := rules.NewBoardState(test.initialBoardState.Width, test.initialBoardState.Height)
			editor := maps.NewBoardStateEditor(nextBoardState)
			settings := settings.WithRand(test.rand)

			err := m.SetupBoard(test.initialBoardState, settings, editor)

			if test.err != nil {
				require.Equal(t, test.err, err)
			} else {
				require.Equalf(t, test.expected, nextBoardState, "%#v", nextBoardState.Food)
			}
		})
	}
}

func TestStandardMapUpdateBoard(t *testing.T) {
	m := maps.StandardMap{}

	tests := []struct {
		name              string
		initialBoardState *rules.BoardState
		settings          rules.Settings
		rand              rules.Rand

		expected *rules.BoardState
	}{
		{
			"empty no food",
			rules.NewBoardState(2, 2),
			rules.NewSettingsWithParams(rules.ParamFoodSpawnChance, "0", rules.ParamMinimumFood, "0"),
			rules.MinRand,
			rules.NewBoardState(2, 2),
		},
		{
			"empty MinimumFood",
			rules.NewBoardState(2, 2),
			rules.NewSettingsWithParams(rules.ParamFoodSpawnChance, "0", rules.ParamMinimumFood, "2"),
			rules.MinRand,
			rules.NewBoardState(2, 2).WithFood([]rules.Point{{X: 0, Y: 0}, {X: 0, Y: 1}}),
		},
		{
			"not empty MinimumFood",
			rules.NewBoardState(2, 2).WithFood([]rules.Point{{X: 0, Y: 1}}),
			rules.NewSettingsWithParams(rules.ParamFoodSpawnChance, "0", rules.ParamMinimumFood, "2"),
			rules.MinRand,
			rules.NewBoardState(2, 2).WithFood([]rules.Point{{X: 0, Y: 1}, {X: 0, Y: 0}}),
		},
		{
			"empty FoodSpawnChance inactive",
			rules.NewBoardState(2, 2),
			rules.NewSettingsWithParams(rules.ParamFoodSpawnChance, "50", rules.ParamMinimumFood, "0"),
			rules.MinRand,
			rules.NewBoardState(2, 2),
		},
		{
			"empty FoodSpawnChance active",
			rules.NewBoardState(2, 2),
			rules.NewSettingsWithParams(rules.ParamFoodSpawnChance, "50", rules.ParamMinimumFood, "0"),
			rules.MaxRand,
			rules.NewBoardState(2, 2).WithFood([]rules.Point{{X: 0, Y: 1}}),
		},
		{
			"not empty FoodSpawnChance active",
			rules.NewBoardState(2, 2).WithFood([]rules.Point{{X: 0, Y: 0}}),
			rules.NewSettingsWithParams(rules.ParamFoodSpawnChance, "50", rules.ParamMinimumFood, "0"),
			rules.MaxRand,
			rules.NewBoardState(2, 2).WithFood([]rules.Point{{X: 0, Y: 0}, {X: 1, Y: 0}}),
		},
		{
			"not empty FoodSpawnChance no room",
			rules.NewBoardState(2, 2).WithFood([]rules.Point{{X: 0, Y: 0}, {X: 0, Y: 1}, {X: 1, Y: 0}, {X: 1, Y: 1}}),
			rules.NewSettingsWithParams(rules.ParamFoodSpawnChance, "50", rules.ParamMinimumFood, "0"),
			rules.MaxRand,
			rules.NewBoardState(2, 2).WithFood([]rules.Point{{X: 0, Y: 0}, {X: 0, Y: 1}, {X: 1, Y: 0}, {X: 1, Y: 1}}),
		},
	}
	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			nextBoardState := test.initialBoardState.Clone()
			settings := test.settings.WithRand(test.rand)
			editor := maps.NewBoardStateEditor(nextBoardState)

			err := m.PostUpdateBoard(test.initialBoardState.Clone(), settings, editor)

			require.NoError(t, err)
			require.Equal(t, test.expected, nextBoardState)
		})
	}
}

func generateSnakes(n int) []rules.Snake {
	var snakes []rules.Snake
	for i := 0; i < n; i++ {
		snakes = append(snakes, rules.Snake{
			ID: fmt.Sprint(i + 1),
		})
	}
	return snakes
}