/*
 * Copyright 2022 Google LLC
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "modules/skunicode/include/SkUnicode.h"

#include "include/private/SkBitmaskEnum.h"
#include "include/private/base/SkDebug.h"
#include "include/private/base/SkTemplates.h"

using namespace skia_private;

std::unique_ptr<SkUnicode> SkUnicode::Make() {
#ifdef SK_UNICODE_ICU_IMPLEMENTATION
    std::unique_ptr<SkUnicode> unicode = SkUnicode::MakeIcuBasedUnicode();
    if (unicode) {
        return unicode;
    }
#endif
    return nullptr;
}

std::unique_ptr<SkUnicode> MakeClientBasedUnicode(
        SkSpan<char> text,
        std::vector<SkUnicode::Position> words,
        std::vector<SkUnicode::Position> graphemeBreaks,
        std::vector<SkUnicode::LineBreakBefore> lineBreaks) {
#ifdef SK_UNICODE_CLIENT_IMPLEMENTATION
    std::unique_ptr<SkUnicode> unicode =
            SkUnicode::MakeClientBasedUnicode(text, words, graphemeBreaks, lineBreaks);
    if (unicode) {
        return unicode;
    }
#endif
    return nullptr;
}

SkString SkUnicode::convertUtf16ToUtf8(const char16_t* utf16, int utf16Units) {

    int utf8Units = SkUTF::UTF16ToUTF8(nullptr, 0, (uint16_t*)utf16, utf16Units);
    if (utf8Units < 0) {
        SkDEBUGF("Convert error: Invalid utf16 input");
        return SkString();
    }
    AutoTArray<char> utf8(utf8Units);
    SkDEBUGCODE(int dstLen =) SkUTF::UTF16ToUTF8(utf8.data(), utf8Units, (uint16_t*)utf16, utf16Units);
    SkASSERT(dstLen == utf8Units);

    return SkString(utf8.data(), utf8Units);
}

SkString SkUnicode::convertUtf16ToUtf8(const std::u16string& utf16) {
    return convertUtf16ToUtf8(utf16.c_str(), utf16.size());
}

std::u16string SkUnicode::convertUtf8ToUtf16(const char* utf8, int utf8Units) {

    int utf16Units = SkUTF::UTF8ToUTF16(nullptr, 0, utf8, utf8Units);
    if (utf16Units < 0) {
        SkDEBUGF("Convert error: Invalid utf8 input");
        return std::u16string();
    }

    AutoTArray<uint16_t> utf16(utf16Units);
    SkDEBUGCODE(int dstLen =) SkUTF::UTF8ToUTF16(utf16.data(), utf16Units, utf8, utf8Units);
    SkASSERT(dstLen == utf16Units);

    return std::u16string((char16_t *)utf16.data(), utf16Units);
}

std::u16string SkUnicode::convertUtf8ToUtf16(const SkString& utf8) {
    return convertUtf8ToUtf16(utf8.c_str(), utf8.size());
}

bool SkUnicode::isTabulation(SkUnicode::CodeUnitFlags flags) {
    return (flags & SkUnicode::kTabulation) == SkUnicode::kTabulation;
}

bool SkUnicode::isHardLineBreak(SkUnicode::CodeUnitFlags flags) {
    return (flags & SkUnicode::kHardLineBreakBefore) == SkUnicode::kHardLineBreakBefore;
}

bool SkUnicode::isSoftLineBreak(SkUnicode::CodeUnitFlags flags) {
    return (flags & SkUnicode::kSoftLineBreakBefore) == SkUnicode::kSoftLineBreakBefore;
}

bool SkUnicode::isGraphemeStart(SkUnicode::CodeUnitFlags flags) {
    return (flags & SkUnicode::kGraphemeStart) == SkUnicode::kGraphemeStart;
}

bool SkUnicode::isControl(SkUnicode::CodeUnitFlags flags) {
    return (flags & SkUnicode::kControl) == SkUnicode::kControl;
}

bool SkUnicode::isPartOfWhiteSpaceBreak(SkUnicode::CodeUnitFlags flags) {
    return (flags & SkUnicode::kPartOfWhiteSpaceBreak) == SkUnicode::kPartOfWhiteSpaceBreak;
}