#pragma once

#include <QJsonArray>
#include <QJsonObject>
#include <QList>
#include <QObject>
#include <QString>

#include <functional>

namespace ZShell::llm {

struct ToolResult {
	bool ok = false;
	QString text;
};

struct ToolContext {
	QString toolCallId;
	QString workspace;
	int outputBudgetChars = 0;
};

using ToolDone = std::function<void(const ToolResult&)>;

class ToolRegistry;

class LlmTool : public QObject {
	Q_OBJECT

	public:
	explicit LlmTool(ToolRegistry* registry, QObject* parent = nullptr);
	~LlmTool() override;

	[[nodiscard]] virtual QString name() const = 0;
	[[nodiscard]] virtual QString description() const = 0;
	[[nodiscard]] virtual QJsonObject parameters() const = 0;

	[[nodiscard]] virtual bool available(const ToolContext& context) const;

	virtual void execute(
		const ToolContext& context, const QJsonObject& args, ToolDone done) = 0;

	virtual void cancel();

	[[nodiscard]] QJsonObject specification() const;

	[[nodiscard]] ToolRegistry* registry() const { return m_registry; }

	private:
	ToolRegistry* m_registry;
};

class ToolRegistry : public QObject {
	Q_OBJECT

	public:
	explicit ToolRegistry(QObject* parent = nullptr);

	void registerTool(LlmTool* tool);
	[[nodiscard]] LlmTool* tool(const QString& name) const;
	[[nodiscard]] QList<LlmTool*> tools() const { return m_tools; }
	[[nodiscard]] QJsonArray specifications(const ToolContext& context) const;
	void cancelAll();

	[[nodiscard]] bool enabled() const { return m_enabled; }
	void setEnabled(bool value);
	[[nodiscard]] bool sandboxEnabled() const { return m_sandbox; }
	void setSandboxEnabled(bool value);

	[[nodiscard]] int contextSize() const { return m_contextSize; }
	void setContextSize(int value);

	[[nodiscard]] int outputBudgetChars(int callCount) const;

	static constexpr int CharsPerToken = 4;
	static constexpr int DefaultInlineChars = 64 * 1024;
	static constexpr int MinBudgetTokens = 512;

	private:
	bool m_enabled = true;
	bool m_sandbox = true;
	int m_contextSize = 0;
	QList<LlmTool*> m_tools;
};

} // namespace ZShell::llm