package goparsify

import (
	"testing"

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

func TestStringLit(t *testing.T) {
	parser := StringLit(`"'`)
	t.Run("test double match", func(t *testing.T) {
		result, p := runParser(`"hello"`, parser)
		require.Equal(t, `hello`, result.Result)
		require.Equal(t, "", p.Get())
	})

	t.Run("test single match", func(t *testing.T) {
		result, p := runParser(`"hello"`, parser)
		require.Equal(t, `hello`, result.Result)
		require.Equal(t, "", p.Get())
	})

	t.Run("test nested quotes", func(t *testing.T) {
		result, p := runParser(`"hello 'world'"`, parser)
		require.Equal(t, `hello 'world'`, result.Result)
		require.Equal(t, "", p.Get())
	})

	t.Run("test non match", func(t *testing.T) {
		_, p := runParser(`1`, parser)
		require.Equal(t, `"'`, p.Error.Expected)
		require.Equal(t, `1`, p.Get())
	})

	t.Run("test unterminated string", func(t *testing.T) {
		_, p := runParser(`"hello `, parser)
		require.Equal(t, `"`, p.Error.Expected)
		require.Equal(t, `"hello `, p.Get())
	})

	t.Run("test unmatched quotes", func(t *testing.T) {
		_, p := runParser(`"hello '`, parser)
		require.Equal(t, `"`, p.Error.Expected)
		require.Equal(t, 0, p.Pos)
	})

	t.Run("test unterminated escape", func(t *testing.T) {
		_, p := runParser(`"hello \`, parser)
		require.Equal(t, `"`, p.Error.Expected)
		require.Equal(t, 0, p.Pos)
	})

	t.Run("test escaping", func(t *testing.T) {
		result, p := runParser(`"hello \"world\""`, parser)
		require.Equal(t, `hello "world"`, result.Result)
		require.Equal(t, ``, p.Get())
	})

	t.Run("test unicode chars", func(t *testing.T) {
		result, p := runParser(`"hello 👺 my little goblin"`, parser)
		require.Equal(t, `hello 👺 my little goblin`, result.Result)
		require.Equal(t, ``, p.Get())
	})

	t.Run("test escaped unicode", func(t *testing.T) {
		result, p := runParser(`"hello \ubeef cake"`, parser)
		require.Equal(t, "", p.Error.Expected)
		require.Equal(t, "hello \uBEEF cake", result.Result)
		require.Equal(t, ``, p.Get())
	})

	t.Run("test invalid escaped unicode", func(t *testing.T) {
		_, p := runParser(`"hello \ucake"`, parser)
		require.Equal(t, "offset 9: Expected [a-f0-9]", p.Error.Error())
		require.Equal(t, 0, p.Pos)
	})

	t.Run("test incomplete escaped unicode", func(t *testing.T) {
		_, p := runParser(`"hello \uca"`, parser)
		require.Equal(t, "offset 9: Expected [a-f0-9]{4}", p.Error.Error())
		require.Equal(t, 0, p.Pos)
	})
}

func TestUnhex(t *testing.T) {
	tests := map[int64]string{
		0xF:        "F",
		0x5:        "5",
		0xFF:       "FF",
		0xFFF:      "FFF",
		0xA4B:      "a4b",
		0xFFFF:     "FFFF",
		0xBEEFCAFE: "beeFCAfe",
	}
	for expected, input := range tests {
		t.Run(input, func(t *testing.T) {
			r, ok := unhex(input)
			require.True(t, ok)
			require.EqualValues(t, expected, r)
		})
	}

	t.Run("Fails on non hex chars", func(t *testing.T) {
		_, ok := unhex("hello")
		require.False(t, ok)
	})
}

func TestNumberLit(t *testing.T) {
	parser := NumberLit()
	t.Run("test int", func(t *testing.T) {
		result, p := runParser("1234", parser)
		require.Equal(t, int64(1234), result.Result)
		require.Equal(t, "", p.Get())
	})

	t.Run("test float", func(t *testing.T) {
		result, p := runParser("12.34", parser)
		require.Equal(t, 12.34, result.Result)
		require.Equal(t, "", p.Get())
	})

	t.Run("test negative float", func(t *testing.T) {
		result, p := runParser("-12.34", parser)
		require.Equal(t, -12.34, result.Result)
		require.Equal(t, "", p.Get())
	})

	t.Run("without leading zero", func(t *testing.T) {
		result, p := runParser("-.34", parser)
		require.Equal(t, -.34, result.Result)
		require.Equal(t, "", p.Get())
	})

	t.Run("scientific notation", func(t *testing.T) {
		result, p := runParser("12.34e3", parser)
		require.Equal(t, 12.34e3, result.Result)
		require.Equal(t, "", p.Get())
	})

	t.Run("scientific notation without decimal", func(t *testing.T) {
		result, p := runParser("34e3", parser)
		require.Equal(t, 34e3, result.Result)
		require.Equal(t, "", p.Get())
	})

	t.Run("scientific notation negative power", func(t *testing.T) {
		result, p := runParser("34e-3", parser)
		require.Equal(t, 34e-3, result.Result)
		require.Equal(t, "", p.Get())
	})

	t.Run("negative scientific notation negative power", func(t *testing.T) {
		result, p := runParser("-.34e-3", parser)
		require.Equal(t, -.34e-3, result.Result)
		require.Equal(t, "", p.Get())
	})

	t.Run("partial match", func(t *testing.T) {
		result, p := runParser("-1.34foo", parser)
		require.Equal(t, -1.34, result.Result)
		require.Equal(t, "foo", p.Get())
	})

	t.Run("non matching string", func(t *testing.T) {
		_, p := runParser("foo", parser)
		require.Equal(t, "offset 0: Expected number", p.Error.Error())
		require.Equal(t, 0, p.Pos)
	})

	t.Run("invalid number", func(t *testing.T) {
		_, p := runParser("-.", parser)
		require.Equal(t, "offset 0: Expected number", p.Error.Error())
		require.Equal(t, 0, p.Pos)
	})
}