/*
  ==============================================================================

   This file is part of the JUCE framework.
   Copyright (c) Raw Material Software Limited

   JUCE is an open source framework subject to commercial or open source
   licensing.

   By downloading, installing, or using the JUCE framework, or combining the
   JUCE framework with any other source code, object code, content or any other
   copyrightable work, you agree to the terms of the JUCE End User Licence
   Agreement, and all incorporated terms including the JUCE Privacy Policy and
   the JUCE Website Terms of Service, as applicable, which will bind you. If you
   do not agree to the terms of these agreements, we will not license the JUCE
   framework to you, and you must discontinue the installation or download
   process and cease use of the JUCE framework.

   JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
   JUCE Privacy Policy: https://juce.com/juce-privacy-policy
   JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/

   Or:

   You may also use this code under the terms of the AGPLv3:
   https://www.gnu.org/licenses/agpl-3.0.en.html

   THE JUCE FRAMEWORK IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL
   WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.

  ==============================================================================
*/

namespace juce
{

StringPairArray::StringPairArray (bool shouldIgnoreCase)  : ignoreCase (shouldIgnoreCase)
{
}

StringPairArray::StringPairArray (const StringPairArray& other)
    : keys (other.keys),
      values (other.values),
      ignoreCase (other.ignoreCase)
{
}

StringPairArray& StringPairArray::operator= (const StringPairArray& other)
{
    keys = other.keys;
    values = other.values;
    return *this;
}

bool StringPairArray::operator== (const StringPairArray& other) const
{
    auto num = size();

    if (num != other.size())
        return false;

    for (int i = 0; i < num; ++i)
    {
        if (keys[i] == other.keys[i]) // optimise for the case where the keys are in the same order
        {
            if (values[i] != other.values[i])
                return false;
        }
        else
        {
            // if we encounter keys that are in a different order, search remaining items by brute force..
            for (int j = i; j < num; ++j)
            {
                auto otherIndex = other.keys.indexOf (keys[j], other.ignoreCase);

                if (otherIndex < 0 || values[j] != other.values[otherIndex])
                    return false;
            }

            return true;
        }
    }

    return true;
}

bool StringPairArray::operator!= (const StringPairArray& other) const
{
    return ! operator== (other);
}

const String& StringPairArray::operator[] (StringRef key) const
{
    return values[keys.indexOf (key, ignoreCase)];
}

String StringPairArray::getValue (StringRef key, const String& defaultReturnValue) const
{
    auto i = keys.indexOf (key, ignoreCase);

    if (i >= 0)
        return values[i];

    return defaultReturnValue;
}

bool StringPairArray::containsKey (StringRef key) const noexcept
{
    return keys.contains (key, ignoreCase);
}

void StringPairArray::set (const String& key, const String& value)
{
    auto i = keys.indexOf (key, ignoreCase);

    if (i >= 0)
    {
        values.set (i, value);
    }
    else
    {
        keys.add (key);
        values.add (value);
    }
}

void StringPairArray::addArray (const StringPairArray& other)
{
    for (int i = 0; i < other.size(); ++i)
        set (other.keys[i], other.values[i]);
}

void StringPairArray::clear()
{
    keys.clear();
    values.clear();
}

void StringPairArray::remove (StringRef key)
{
    remove (keys.indexOf (key, ignoreCase));
}

void StringPairArray::remove (int index)
{
    keys.remove (index);
    values.remove (index);
}

void StringPairArray::setIgnoresCase (bool shouldIgnoreCase)
{
    ignoreCase = shouldIgnoreCase;
}

bool StringPairArray::getIgnoresCase() const noexcept
{
    return ignoreCase;
}

String StringPairArray::getDescription() const
{
    String s;

    for (int i = 0; i < keys.size(); ++i)
    {
        s << keys[i] << " = " << values[i];

        if (i < keys.size())
            s << ", ";
    }

    return s;
}

void StringPairArray::minimiseStorageOverheads()
{
    keys.minimiseStorageOverheads();
    values.minimiseStorageOverheads();
}

template <typename Map>
void StringPairArray::addMapImpl (const Map& toAdd)
{
    // If we just called `set` for each item in `toAdd`, that would
    // perform badly when adding to large StringPairArrays, as `set`
    // has to loop through the whole container looking for matching keys.
    // Instead, we use a temporary map to give us better lookup performance.
    std::map<String, int> contents;

    const auto normaliseKey = [this] (const String& key)
    {
        return ignoreCase ? key.toLowerCase() : key;
    };

    for (auto i = 0; i != size(); ++i)
        contents.emplace (normaliseKey (getAllKeys().getReference (i)), i);

    for (const auto& pair : toAdd)
    {
        const auto key = normaliseKey (pair.first);
        const auto it = contents.find (key);

        if (it != contents.cend())
        {
            values.getReference (it->second) = pair.second;
        }
        else
        {
            contents.emplace (key, static_cast<int> (contents.size()));
            keys.add (pair.first);
            values.add (pair.second);
        }
    }
}

void StringPairArray::addUnorderedMap (const std::unordered_map<String, String>& toAdd) { addMapImpl (toAdd); }
void StringPairArray::addMap (const std::map<String, String>& toAdd)                    { addMapImpl (toAdd); }

//==============================================================================
//==============================================================================
#if JUCE_UNIT_TESTS

static String operator""_S (const char* chars, size_t)
{
    return String { chars };
}

class StringPairArrayTests final : public UnitTest
{
public:
    StringPairArrayTests()
        : UnitTest ("StringPairArray", UnitTestCategories::text)
    {}

    void runTest() override
    {
        beginTest ("addMap respects case sensitivity of StringPairArray");
        {
            StringPairArray insensitive { true };
            insensitive.addMap ({ { "duplicate", "a" },
                                  { "Duplicate", "b" } });

            expect (insensitive.size() == 1);
            expectEquals (insensitive["DUPLICATE"], "a"_S);

            StringPairArray sensitive { false };
            sensitive.addMap ({ { "duplicate", "a"_S },
                                { "Duplicate", "b"_S } });

            expect (sensitive.size() == 2);
            expectEquals (sensitive["duplicate"], "a"_S);
            expectEquals (sensitive["Duplicate"], "b"_S);
            expectEquals (sensitive["DUPLICATE"], ""_S);
        }

        beginTest ("addMap overwrites existing pairs");
        {
            StringPairArray insensitive { true };
            insensitive.set ("key", "value");
            insensitive.addMap ({ { "KEY", "VALUE" } });

            expect (insensitive.size() == 1);
            expectEquals (insensitive.getAllKeys()[0], "key"_S);
            expectEquals (insensitive.getAllValues()[0], "VALUE"_S);

            StringPairArray sensitive { false };
            sensitive.set ("key", "value");
            sensitive.addMap ({ { "KEY", "VALUE" },
                                { "key", "another value" } });

            expect (sensitive.size() == 2);
            expect (sensitive.getAllKeys() == StringArray { "key", "KEY" });
            expect (sensitive.getAllValues() == StringArray { "another value", "VALUE" });
        }

        beginTest ("addMap doesn't change the order of existing keys");
        {
            StringPairArray array;
            array.set ("a", "a");
            array.set ("z", "z");
            array.set ("b", "b");
            array.set ("y", "y");
            array.set ("c", "c");

            array.addMap ({ { "B", "B" },
                            { "0", "0" },
                            { "Z", "Z" } });

            expect (array.getAllKeys() == StringArray { "a", "z", "b", "y", "c", "0" });
            expect (array.getAllValues() == StringArray { "a", "Z", "B", "y", "c", "0" });
        }

        beginTest ("addMap has equivalent behaviour to addArray");
        {
            StringPairArray initial;
            initial.set ("aaa", "aaa");
            initial.set ("zzz", "zzz");
            initial.set ("bbb", "bbb");

            auto withAddMap = initial;
            withAddMap.addMap ({ { "ZZZ", "ZZZ" },
                                 { "ddd", "ddd" } });

            auto withAddArray = initial;
            withAddArray.addArray ([]
            {
                StringPairArray toAdd;
                toAdd.set ("ZZZ", "ZZZ");
                toAdd.set ("ddd", "ddd");
                return toAdd;
            }());

            expect (withAddMap == withAddArray);
        }
    }
};

static StringPairArrayTests stringPairArrayTests;

#endif

} // namespace juce
