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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package norm

import "testing"

// TestCase is used for most tests.
type TestCase struct {
        in  []rune
        out []rune
}

type insertFunc func(rb *reorderBuffer, r rune) bool

func insert(rb *reorderBuffer, r rune) bool {
        src := inputString(string(r))
        return rb.insert(src, 0, rb.f.info(src, 0))
}

func runTests(t *testing.T, name string, fm Form, f insertFunc, tests []TestCase) {
        rb := reorderBuffer{}
        rb.init(fm, nil)
        for i, test := range tests {
                rb.reset()
                for j, rune := range test.in {
                        b := []byte(string(rune))
                        src := inputBytes(b)
                        if !rb.insert(src, 0, rb.f.info(src, 0)) {
                                t.Errorf("%s:%d: insert failed for rune %d", name, i, j)
                        }
                }
                if rb.f.composing {
                        rb.compose()
                }
                if rb.nrune != len(test.out) {
                        t.Errorf("%s:%d: length = %d; want %d", name, i, rb.nrune, len(test.out))
                        continue
                }
                for j, want := range test.out {
                        found := rune(rb.runeAt(j))
                        if found != want {
                                t.Errorf("%s:%d: runeAt(%d) = %U; want %U", name, i, j, found, want)
                        }
                }
        }
}

func TestFlush(t *testing.T) {
        rb := reorderBuffer{}
        rb.init(NFC, nil)
        out := make([]byte, 0)

        out = rb.flush(out)
        if len(out) != 0 {
                t.Errorf("wrote bytes on flush of empty buffer. (len(out) = %d)", len(out))
        }

        for _, r := range []rune("world!") {
                insert(&rb, r)
        }

        out = []byte("Hello ")
        out = rb.flush(out)
        want := "Hello world!"
        if string(out) != want {
                t.Errorf(`output after flush was "%s"; want "%s"`, string(out), want)
        }
        if rb.nrune != 0 {
                t.Errorf("flush: non-null size of info buffer (rb.nrune == %d)", rb.nrune)
        }
        if rb.nbyte != 0 {
                t.Errorf("flush: non-null size of byte buffer (rb.nbyte == %d)", rb.nbyte)
        }
}

var insertTests = []TestCase{
        {[]rune{'a'}, []rune{'a'}},
        {[]rune{0x300}, []rune{0x300}},
        {[]rune{0x300, 0x316}, []rune{0x316, 0x300}}, // CCC(0x300)==230; CCC(0x316)==220
        {[]rune{0x316, 0x300}, []rune{0x316, 0x300}},
        {[]rune{0x41, 0x316, 0x300}, []rune{0x41, 0x316, 0x300}},
        {[]rune{0x41, 0x300, 0x316}, []rune{0x41, 0x316, 0x300}},
        {[]rune{0x300, 0x316, 0x41}, []rune{0x316, 0x300, 0x41}},
        {[]rune{0x41, 0x300, 0x40, 0x316}, []rune{0x41, 0x300, 0x40, 0x316}},
}

func TestInsert(t *testing.T) {
        runTests(t, "TestInsert", NFD, insert, insertTests)
}

var decompositionNFDTest = []TestCase{
        {[]rune{0xC0}, []rune{0x41, 0x300}},
        {[]rune{0xAC00}, []rune{0x1100, 0x1161}},
        {[]rune{0x01C4}, []rune{0x01C4}},
        {[]rune{0x320E}, []rune{0x320E}},
        {[]rune("음ẻ과"), []rune{0x110B, 0x1173, 0x11B7, 0x65, 0x309, 0x1100, 0x116A}},
}

var decompositionNFKDTest = []TestCase{
        {[]rune{0xC0}, []rune{0x41, 0x300}},
        {[]rune{0xAC00}, []rune{0x1100, 0x1161}},
        {[]rune{0x01C4}, []rune{0x44, 0x5A, 0x030C}},
        {[]rune{0x320E}, []rune{0x28, 0x1100, 0x1161, 0x29}},
}

func TestDecomposition(t *testing.T) {
        runTests(t, "TestDecompositionNFD", NFD, insert, decompositionNFDTest)
        runTests(t, "TestDecompositionNFKD", NFKD, insert, decompositionNFKDTest)
}

var compositionTest = []TestCase{
        {[]rune{0x41, 0x300}, []rune{0xC0}},
        {[]rune{0x41, 0x316}, []rune{0x41, 0x316}},
        {[]rune{0x41, 0x300, 0x35D}, []rune{0xC0, 0x35D}},
        {[]rune{0x41, 0x316, 0x300}, []rune{0xC0, 0x316}},
        // blocking starter
        {[]rune{0x41, 0x316, 0x40, 0x300}, []rune{0x41, 0x316, 0x40, 0x300}},
        {[]rune{0x1100, 0x1161}, []rune{0xAC00}},
        // parenthesized Hangul, alternate between ASCII and Hangul.
        {[]rune{0x28, 0x1100, 0x1161, 0x29}, []rune{0x28, 0xAC00, 0x29}},
}

func TestComposition(t *testing.T) {
        runTests(t, "TestComposition", NFC, insert, compositionTest)
}