#include "PresetManager.h"
#include "PluginProcessor.h"
#include "FactoryPresets.h"

PresetManager::PresetManager(FDNReverbAudioProcessor& p)
    : processor(p)
{
    seedFactoryPresets();
    refreshPresetList();
}

// -----------------------------------------------------------------------------
// factory presets
// -----------------------------------------------------------------------------
// embeds Presets/*.ambpreset into the binary, then copies any that are
// missing into the user folder, so the factory set survives fresh installs.
// -----------------------------------------------------------------------------
void PresetManager::seedFactoryPresets()
{
    auto folder = getPresetsFolder();

    for (int i = 0; i < FactoryPresets::namedResourceListSize; ++i)
    {
        const auto filename = juce::String::fromUTF8(FactoryPresets::originalFilenames[i]);
        auto dest = folder.getChildFile(filename);
        if (dest.exists())
            continue;

        int size = 0;
        if (auto* data = FactoryPresets::getNamedResource(FactoryPresets::namedResourceList[i], size))
            dest.replaceWithData(data, size);
    }
}

// -----------------------------------------------------------------------------
// filesystem
// -----------------------------------------------------------------------------
juce::File PresetManager::getPresetsFolder() const
{
    auto folder = juce::File::getSpecialLocation(
        juce::File::userDocumentsDirectory)
        .getChildFile(kSubFolder);
    if (!folder.exists())
        folder.createDirectory();
    return folder;
}

juce::File PresetManager::getPresetFile(const juce::String& name) const
{
    return getPresetsFolder().getChildFile(name + kExtension);
}

void PresetManager::refreshPresetList()
{
    presetNames.clear();
    auto files = getPresetsFolder().findChildFiles(
        juce::File::findFiles, false,
        juce::String("*") + kExtension);
    files.sort();
    for (const auto& f : files)
        presetNames.add(f.getFileNameWithoutExtension());
}

// -----------------------------------------------------------------------------
// save
// -----------------------------------------------------------------------------
// reuses PluginProcessor::getStateInformation() directly,
// so no PluginProcessor changes are needed.
// -----------------------------------------------------------------------------
// --- after changes ---
bool PresetManager::savePreset(const juce::String& name)
{
    if (name.isEmpty()) return false;
     // * fix: notify the Processor of the name before getStateInformation()
     // so getStateInformation() writes the correct name into the ValueTree
    processor.setLastSavedPresetName(name);
    juce::MemoryBlock data;
    processor.getStateInformation(data);

    auto file = getPresetFile(name);
    if (!file.replaceWithData(data.getData(), data.getSize()))
        return false;

    currentPresetName = name;
    refreshPresetList();
    if (onPresetListChanged) onPresetListChanged();
    if (onPresetLoaded)      onPresetLoaded(name);
    return true;
}

// -----------------------------------------------------------------------------
// load
// -----------------------------------------------------------------------------
// reuses PluginProcessor::setStateInformation() directly.
// setStateInformation() sets paramsNeedUpdate=true, so
// the next processBlock() sends the new parameters to the engine.
// -----------------------------------------------------------------------------
bool PresetManager::loadPreset(const juce::String& name)
{
    auto file = getPresetFile(name);
    if (!file.exists()) return false;

    juce::MemoryBlock data;
    if (!file.loadFileAsData(data)) return false;

    processor.setStateInformation(data.getData(), static_cast<int>(data.getSize()));

     // * after loading a preset always normal view (Normal Mode)
    if (auto* param = processor.apvts.getParameter("promode"))
        param->setValueNotifyingHost(0.0f);

    currentPresetName = name;
    if (onPresetLoaded) onPresetLoaded(name);
    return true;
}

// -----------------------------------------------------------------------------
// delete
// -----------------------------------------------------------------------------
bool PresetManager::deletePreset(const juce::String& name)
{
    auto file = getPresetFile(name);
    if (!file.exists()) return false;

    if (!file.deleteFile()) return false;

    if (currentPresetName == name)
        currentPresetName.clear();

    refreshPresetList();
    if (onPresetListChanged) onPresetListChanged();
    return true;
}

// -----------------------------------------------------------------------------
// navigation
// -----------------------------------------------------------------------------
int PresetManager::getCurrentPresetIndex() const noexcept
{
    return presetNames.indexOf(currentPresetName);
}

void PresetManager::loadPrevPreset()
{
    if (presetNames.isEmpty()) return;
    int idx = getCurrentPresetIndex();
    if (idx <= 0)
        idx = presetNames.size();
    loadPreset(presetNames[idx - 1]);
}

void PresetManager::loadNextPreset()
{
    if (presetNames.isEmpty()) return;
    int idx = getCurrentPresetIndex();
    if (idx < 0 || idx >= presetNames.size() - 1)
        idx = -1;
    loadPreset(presetNames[idx + 1]);
}