#pragma once

#include "node.hpp"

namespace ZShell::settings {

class ListNode : public Node {
	Q_OBJECT
	QML_ANONYMOUS

	Q_PROPERTY(qsizetype count READ count NOTIFY countChanged)
	Q_PROPERTY(QVariantList values READ values NOTIFY elementsChanged)

	using NodeChanges = QList<qsizetype>;
	using MoveChanges = QList<QPair<qsizetype, qsizetype>>;

	public:
	explicit ListNode(
		ListNode* fallback, QObject* parent = nullptr, bool globalOnly = false);

	[[nodiscard]] qsizetype count() const;
	[[nodiscard]] QVariantList values() const;

	Q_INVOKABLE void remove(qsizetype index);
	Q_INVOKABLE void move(qsizetype from, qsizetype to);
	Q_INVOKABLE void clear();

	[[nodiscard]] QString pathFor(const QString& key) const override;
	[[nodiscard]] const Schema& schema() const override;
	[[nodiscard]] QVariant value(const QString& key) const override;
	bool setValue(const QString& key, const QVariant& value) override;
	bool setValue(
		const QString& key,
		const QVariant& value,
		QList<Diagnostic>* diagnostics);
	void resetToDefaults() override;

	[[nodiscard]] QJsonValue toJson(bool sparse = true) const override;
	bool syncJson(
		const QJsonValue& json, QList<Diagnostic>& diagnostics) override;

	signals:
	void countChanged();
	void elementsChanged(
		const NodeChanges& added,
		const NodeChanges& removed,
		const MoveChanges& moved);

	protected:
	bool recordWrite(const QString& key, bool changed) override;
	[[nodiscard]] QString keyOf(const Node* child) const override;

	[[nodiscard]] Node* elementAt(qsizetype index) const;
	[[nodiscard]] Node* insertElement(
		const QVariantMap& props, qsizetype index = -1);
	[[nodiscard]] virtual Node* createElement(Node* fallback) = 0;

	private:
	QList<Node*> m_elements;

	[[nodiscard]] QList<QVariantMap> defaultValue() const;
	[[nodiscard]] bool isNested() const;

	// Returns true if the mutation should be skipped, overlays cannot mutate global lists
	[[nodiscard]] bool rejectGlobalMutation() const;

	[[nodiscard]] bool validIndex(qsizetype index) const;
	[[nodiscard]] const Descriptor* getDescriptor() const;
	[[nodiscard]] Node* fallbackFor(qsizetype index) const;

	void insertMissingDefaults();

	Node* insertNode(qsizetype index, const QVariantMap& props, Node* fallback);
	Node* insertNode(qsizetype index, Node* node);
	Node* insertNode(
		qsizetype index,
		const QJsonObject& json,
		QList<Diagnostic>& diagnostics);

	void onFallbackListNotify(
		const NodeChanges& added,
		const NodeChanges& removed,
		const MoveChanges& moved);
};

} // namespace ZShell::settings