/* 
 * Copyright (C) 2025 Petr Mironychev
 *
 * This file is part of QodeAssist.
 *
 * QodeAssist is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * QodeAssist is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with QodeAssist. If not, see <https://www.gnu.org/licenses/>.
 */

#include "ClaudeMessage.hpp"
#include "logger/Logger.hpp"

#include <QJsonArray>
#include <QJsonDocument>

namespace QodeAssist {

ClaudeMessage::ClaudeMessage(QObject *parent)
    : QObject(parent)
{}

void ClaudeMessage::handleContentBlockStart(
    int index, const QString &blockType, const QJsonObject &data)
{
    LOG_MESSAGE(QString("ClaudeMessage: handleContentBlockStart index=%1, blockType=%2")
                    .arg(index)
                    .arg(blockType));

    if (blockType == "text") {
        addCurrentContent<LLMCore::TextContent>();

    } else if (blockType == "tool_use") {
        QString toolId = data["id"].toString();
        QString toolName = data["name"].toString();
        QJsonObject toolInput = data["input"].toObject();

        addCurrentContent<LLMCore::ToolUseContent>(toolId, toolName, toolInput);
        m_pendingToolInputs[index] = "";
    }
}

void ClaudeMessage::handleContentBlockDelta(
    int index, const QString &deltaType, const QJsonObject &delta)
{
    if (index >= m_currentBlocks.size()) {
        return;
    }

    if (deltaType == "text_delta") {
        if (auto textContent = qobject_cast<LLMCore::TextContent *>(m_currentBlocks[index])) {
            textContent->appendText(delta["text"].toString());
        }

    } else if (deltaType == "input_json_delta") {
        QString partialJson = delta["partial_json"].toString();
        if (m_pendingToolInputs.contains(index)) {
            m_pendingToolInputs[index] += partialJson;
        }
    }
}

void ClaudeMessage::handleContentBlockStop(int index)
{
    if (m_pendingToolInputs.contains(index)) {
        QString jsonInput = m_pendingToolInputs[index];
        QJsonObject inputObject;

        if (!jsonInput.isEmpty()) {
            QJsonDocument doc = QJsonDocument::fromJson(jsonInput.toUtf8());
            if (doc.isObject()) {
                inputObject = doc.object();
            }
        }

        if (index < m_currentBlocks.size()) {
            if (auto toolContent = qobject_cast<LLMCore::ToolUseContent *>(m_currentBlocks[index])) {
                toolContent->setInput(inputObject);
            }
        }

        m_pendingToolInputs.remove(index);
    }
}

void ClaudeMessage::handleStopReason(const QString &stopReason)
{
    m_stopReason = stopReason;
    updateStateFromStopReason();
}

QJsonObject ClaudeMessage::toProviderFormat() const
{
    QJsonObject message;
    message["role"] = "assistant";

    QJsonArray content;
    for (auto block : m_currentBlocks) {
        content.append(block->toJson(LLMCore::ProviderFormat::Claude));
    }

    message["content"] = content;
    return message;
}

QJsonArray ClaudeMessage::createToolResultsContent(const QHash<QString, QString> &toolResults) const
{
    QJsonArray results;

    for (auto toolContent : getCurrentToolUseContent()) {
        if (toolResults.contains(toolContent->id())) {
            auto toolResult = std::make_unique<LLMCore::ToolResultContent>(
                toolContent->id(), toolResults[toolContent->id()]);
            results.append(toolResult->toJson(LLMCore::ProviderFormat::Claude));
        }
    }

    return results;
}

QList<LLMCore::ToolUseContent *> ClaudeMessage::getCurrentToolUseContent() const
{
    QList<LLMCore::ToolUseContent *> toolBlocks;
    for (auto block : m_currentBlocks) {
        if (auto toolContent = qobject_cast<LLMCore::ToolUseContent *>(block)) {
            toolBlocks.append(toolContent);
        }
    }
    return toolBlocks;
}

void ClaudeMessage::startNewContinuation()
{
    LOG_MESSAGE(QString("ClaudeMessage: Starting new continuation"));

    m_currentBlocks.clear();
    m_pendingToolInputs.clear();
    m_stopReason.clear();
    m_state = LLMCore::MessageState::Building;
}

void ClaudeMessage::updateStateFromStopReason()
{
    if (m_stopReason == "tool_use" && !getCurrentToolUseContent().empty()) {
        m_state = LLMCore::MessageState::RequiresToolExecution;
    } else if (m_stopReason == "end_turn") {
        m_state = LLMCore::MessageState::Final;
    } else {
        m_state = LLMCore::MessageState::Complete;
    }
}

} // namespace QodeAssist