/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "Annotation.h"

#include <android-base/logging.h>
#include <hidl-util/Formatter.h>
#include <hidl-util/StringHelper.h>
#include <algorithm>
#include <vector>

namespace android {

AnnotationParam::AnnotationParam(const std::string& name) : mName(name) {}

const std::string& AnnotationParam::getName() const {
    return mName;
}

std::vector<ConstantExpression*> AnnotationParam::getConstantExpressions() {
    const auto& constRet = static_cast<const AnnotationParam*>(this)->getConstantExpressions();
    std::vector<ConstantExpression*> ret(constRet.size());
    std::transform(constRet.begin(), constRet.end(), ret.begin(),
                   [](const auto* ce) { return const_cast<ConstantExpression*>(ce); });
    return ret;
}

std::vector<const ConstantExpression*> AnnotationParam::getConstantExpressions() const {
    return {};
}

std::string AnnotationParam::getSingleString() const {
    std::string value = getSingleValue();

    CHECK(value.size() >= 2 && value[0] == '"' && value[value.size() - 1] == '"')
        << mName << " must be a string";

    // unquote string
    value = value.substr(1, value.size() - 2);

    return value;
}

bool AnnotationParam::getSingleBool() const {
    std::string value = getSingleString();

    if (value == "true") {
        return true;
    } else if (value == "false") {
        return false;
    }

    CHECK(false) << mName << " must be of boolean value (true/false).";
    return false;
}

StringAnnotationParam::StringAnnotationParam(const std::string& name,
                                             std::vector<std::string>* values)
    : AnnotationParam(name), mValues(values) {}

std::vector<std::string> StringAnnotationParam::getValues() const {
    return *mValues;
}

std::string StringAnnotationParam::getSingleValue() const {
    CHECK_EQ(mValues->size(), 1u) << mName << " requires one value but has multiple";
    return mValues->at(0);
}

ConstantExpressionAnnotationParam::ConstantExpressionAnnotationParam(
    const std::string& name, std::vector<ConstantExpression*>* values)
    : AnnotationParam(name), mValues(values) {}

std::string convertToString(const ConstantExpression* value) {
    if (value->descriptionIsTrivial()) {
        return value->value();
    }
    return value->value() + " /* " + value->description() + " */";
}

std::vector<std::string> ConstantExpressionAnnotationParam::getValues() const {
    std::vector<std::string> ret;
    for (const auto* value : *mValues) {
        ret.push_back(convertToString(value));
    };
    return ret;
}

std::string ConstantExpressionAnnotationParam::getSingleValue() const {
    CHECK_EQ(mValues->size(), 1u) << mName << " requires one value but has multiple";
    return convertToString(mValues->at(0));
}

std::vector<const ConstantExpression*> ConstantExpressionAnnotationParam::getConstantExpressions()
    const {
    std::vector<const ConstantExpression*> ret;
    ret.insert(ret.end(), mValues->begin(), mValues->end());
    return ret;
}

Annotation::Annotation(const char* name, AnnotationParamVector* params)
    : mName(name), mParams(params) {}

std::string Annotation::name() const {
    return mName;
}

const AnnotationParamVector &Annotation::params() const {
    return *mParams;
}

const AnnotationParam *Annotation::getParam(const std::string &name) const {
    for (const auto* i : *mParams) {
        if (i->getName() == name) {
            return i;
        }
    }

    return nullptr;
}

std::vector<ConstantExpression*> Annotation::getConstantExpressions() {
    const auto& constRet = static_cast<const Annotation*>(this)->getConstantExpressions();
    std::vector<ConstantExpression*> ret(constRet.size());
    std::transform(constRet.begin(), constRet.end(), ret.begin(),
                   [](const auto* ce) { return const_cast<ConstantExpression*>(ce); });
    return ret;
}

std::vector<const ConstantExpression*> Annotation::getConstantExpressions() const {
    std::vector<const ConstantExpression*> ret;
    for (const auto* param : *mParams) {
        const auto& retParam = param->getConstantExpressions();
        ret.insert(ret.end(), retParam.begin(), retParam.end());
    }
    return ret;
}

void Annotation::dump(Formatter &out) const {
    out << "@" << mName;

    if (mParams->size() == 0) {
        return;
    }

    out << "(";

    for (size_t i = 0; i < mParams->size(); ++i) {
        if (i > 0) {
            out << ", ";
        }

        const AnnotationParam* param = mParams->at(i);

        out << param->getName() << "=";

        const std::vector<std::string>& values = param->getValues();
        if (values.size() > 1) {
            out << "{";
        }

        out << StringHelper::JoinStrings(values, ", ");

        if (values.size() > 1) {
            out << "}";
        }
    }

    out << ")";
}

}  // namespace android