package norm

import (
	"testing"
	"utf8"
)

// Test data is located in triedata_test.go; generated by maketesttables.
var testdata = testdataTrie

// Test cases for illegal runes.
type trietest struct {
	size  int
	bytes []byte
}

var tests = []trietest{
	// illegal runes
	{1, []byte{0x80}},
	{1, []byte{0xFF}},
	{1, []byte{t2, tx - 1}},
	{1, []byte{t2, t2}},
	{2, []byte{t3, tx, tx - 1}},
	{2, []byte{t3, tx, t2}},
	{1, []byte{t3, tx - 1, tx}},
	{3, []byte{t4, tx, tx, tx - 1}},
	{3, []byte{t4, tx, tx, t2}},
	{1, []byte{t4, t2, tx, tx - 1}},
	{2, []byte{t4, tx, t2, tx - 1}},

	// short runes
	{0, []byte{t2}},
	{0, []byte{t3, tx}},
	{0, []byte{t4, tx, tx}},
	{0, []byte{t5, tx, tx, tx}},
	{0, []byte{t6, tx, tx, tx, tx}},
}

func mkUtf8(rune int) ([]byte, int) {
	var b [utf8.UTFMax]byte
	sz := utf8.EncodeRune(b[:], rune)
	return b[:sz], sz
}

func TestLookup(t *testing.T) {
	for i, tt := range testRunes {
		b, szg := mkUtf8(tt)
		v, szt := testdata.lookup(b)
		if int(v) != i {
			t.Errorf("lookup(%U): found value %#x, expected %#x", i, v, i)
		}
		if szt != szg {
			t.Errorf("lookup(%U): found size %d, expected %d", i, szt, szg)
		}
	}
	for i, tt := range tests {
		v, sz := testdata.lookup(tt.bytes)
		if int(v) != 0 {
			t.Errorf("lookup of illegal rune, case %d: found value %#x, expected 0", i, v)
		}
		if sz != tt.size {
			t.Errorf("lookup of illegal rune, case %d: found size %d, expected %d", i, sz, tt.size)
		}
	}
}

func TestLookupUnsafe(t *testing.T) {
	for i, tt := range testRunes {
		b, _ := mkUtf8(tt)
		v := testdata.lookupUnsafe(b)
		if int(v) != i {
			t.Errorf("lookupUnsafe(%U): found value %#x, expected %#x", i, v, i)
		}
	}
}

func TestLookupString(t *testing.T) {
	for i, tt := range testRunes {
		b, szg := mkUtf8(tt)
		v, szt := testdata.lookupString(string(b))
		if int(v) != i {
			t.Errorf("lookup(%U): found value %#x, expected %#x", i, v, i)
		}
		if szt != szg {
			t.Errorf("lookup(%U): found size %d, expected %d", i, szt, szg)
		}
	}
	for i, tt := range tests {
		v, sz := testdata.lookupString(string(tt.bytes))
		if int(v) != 0 {
			t.Errorf("lookup of illegal rune, case %d: found value %#x, expected 0", i, v)
		}
		if sz != tt.size {
			t.Errorf("lookup of illegal rune, case %d: found size %d, expected %d", i, sz, tt.size)
		}
	}
}

func TestLookupStringUnsafe(t *testing.T) {
	for i, tt := range testRunes {
		b, _ := mkUtf8(tt)
		v := testdata.lookupStringUnsafe(string(b))
		if int(v) != i {
			t.Errorf("lookupUnsafe(%U): found value %#x, expected %#x", i, v, i)
		}
	}
}