/**************************************************************************/
/*  ai_assistant.cpp                                                      */
/**************************************************************************/

#include "ai_assistant.h"

#include "core/config/project_settings.h"
#include "core/io/json.h"

AIAssistant *AIAssistant::singleton = nullptr;

void AIAssistant::_bind_methods() {
	// Methods
	ClassDB::bind_method(D_METHOD("initialize", "api_key"), &AIAssistant::initialize, DEFVAL(""));
	ClassDB::bind_method(D_METHOD("is_initialized"), &AIAssistant::is_initialized);
	
	ClassDB::bind_method(D_METHOD("get_code_completion", "context", "recent_code"), &AIAssistant::get_code_completion);
	ClassDB::bind_method(D_METHOD("explain_code", "code_block"), &AIAssistant::explain_code);
	ClassDB::bind_method(D_METHOD("fix_error", "error_message", "code_context"), &AIAssistant::fix_error);
	
	ClassDB::bind_method(D_METHOD("generate_function_docs", "function_signature"), &AIAssistant::generate_function_docs);
	ClassDB::bind_method(D_METHOD("natural_language_to_code", "description", "context"), &AIAssistant::natural_language_to_code);
	
	ClassDB::bind_method(D_METHOD("set_api_key", "key"), &AIAssistant::set_api_key);
	ClassDB::bind_method(D_METHOD("get_api_key"), &AIAssistant::get_api_key);
	ClassDB::bind_method(D_METHOD("clear_cache"), &AIAssistant::clear_cache);

	// Properties
	ADD_PROPERTY(PropertyInfo(Variant::STRING, "api_key", PROPERTY_HINT_PASSWORD), "set_api_key", "get_api_key");

	// Enums
	BIND_ENUM_CONSTANT(COMPLETION_TYPE_CODE);
	BIND_ENUM_CONSTANT(COMPLETION_TYPE_DOCUMENTATION);
	BIND_ENUM_CONSTANT(COMPLETION_TYPE_EXPLANATION);
	BIND_ENUM_CONSTANT(COMPLETION_TYPE_FIX);
}

Error AIAssistant::initialize(const String &p_api_key) {
	if (initialized) {
		return OK;
	}

	// Set API key
	if (!p_api_key.is_empty()) {
		api_key = p_api_key;
	} else {
		// Try to get from project settings or environment
		if (ProjectSettings::get_singleton()->has_setting("aethex/ai/api_key")) {
			api_key = ProjectSettings::get_singleton()->get_setting("aethex/ai/api_key");
		}
	}

	if (api_key.is_empty()) {
		ERR_PRINT("AIAssistant: No API key provided. Set it via initialize() or project settings.");
		return ERR_UNCONFIGURED;
	}

	// Initialize API client
	api_client.instantiate();
	api_client->set_api_key(api_key);
	Error err = api_client->initialize();
	
	if (err != OK) {
		ERR_PRINT("AIAssistant: Failed to initialize API client.");
		return err;
	}

	initialized = true;
	print_line("AIAssistant initialized successfully!");
	return OK;
}

String AIAssistant::get_code_completion(const String &p_context, const PackedStringArray &p_recent_code) {
	if (!initialized) {
		ERR_PRINT("AIAssistant: Not initialized. Call initialize() first.");
		return "";
	}

	// Build prompt
	String prompt = "You are an expert GDScript developer. Complete the following code:\n\n";
	
	// Add recent code context
	if (p_recent_code.size() > 0) {
		prompt += "Recent code:\n";
		for (int i = 0; i < p_recent_code.size(); i++) {
			prompt += p_recent_code[i] + "\n";
		}
		prompt += "\n";
	}
	
	prompt += "Current context:\n" + p_context + "\n\n";
	prompt += "Provide only the code completion, no explanations:";

	// Check cache
	String cached = _get_cached_response(prompt);
	if (!cached.is_empty()) {
		return cached;
	}

	// Make API call (sync for now)
	String response = api_client->send_completion_sync(prompt, 5.0);
	
	// Cache the response
	if (!response.is_empty()) {
		_cache_response(prompt, response);
	}

	return response;
}

String AIAssistant::explain_code(const String &p_code_block) {
	if (!initialized) {
		return "";
	}

	String prompt = "Explain this GDScript code clearly and concisely:\n\n";
	prompt += p_code_block;

	String cached = _get_cached_response(prompt);
	if (!cached.is_empty()) {
		return cached;
	}

	String response = api_client->send_completion_sync(prompt, 10.0);
	if (!response.is_empty()) {
		_cache_response(prompt, response);
	}

	return response;
}

String AIAssistant::fix_error(const String &p_error_message, const String &p_code_context) {
	if (!initialized) {
		return "";
	}

	String prompt = "Fix this GDScript error. Provide the corrected code:\n\n";
	prompt += "Error: " + p_error_message + "\n\n";
	prompt += "Code:\n" + p_code_context;

	String response = api_client->send_completion_sync(prompt, 10.0);
	return response;
}

String AIAssistant::generate_function_docs(const String &p_function_signature) {
	if (!initialized) {
		return "";
	}

	String prompt = "Generate documentation for this GDScript function:\n\n";
	prompt += p_function_signature + "\n\n";
	prompt += "Format: Brief description, parameters, returns.";

	String cached = _get_cached_response(prompt);
	if (!cached.is_empty()) {
		return cached;
	}

	String response = api_client->send_completion_sync(prompt, 5.0);
	if (!response.is_empty()) {
		_cache_response(prompt, response);
	}

	return response;
}

String AIAssistant::generate_class_docs(const String &p_class_code) {
	if (!initialized) {
		return "";
	}

	String prompt = "Generate complete documentation for this GDScript class:\n\n";
	prompt += p_class_code;

	String response = api_client->send_completion_sync(prompt, 15.0);
	return response;
}

String AIAssistant::natural_language_to_code(const String &p_description, const String &p_context) {
	if (!initialized) {
		return "";
	}

	String prompt = "Convert this description to GDScript code:\n\n";
	prompt += p_description + "\n\n";
	
	if (!p_context.is_empty()) {
		prompt += "Context:\n" + p_context + "\n\n";
	}
	
	prompt += "Provide clean, working GDScript code:";

	String response = api_client->send_completion_sync(prompt, 10.0);
	return response;
}

void AIAssistant::set_api_key(const String &p_key) {
	api_key = p_key;
	if (api_client.is_valid()) {
		api_client->set_api_key(p_key);
	}
}

String AIAssistant::get_api_key() const {
	return api_key;
}

void AIAssistant::clear_cache() {
	response_cache.clear();
	print_line("AIAssistant: Cache cleared.");
}

String AIAssistant::_get_cached_response(const String &p_prompt) {
	if (response_cache.has(p_prompt)) {
		return response_cache[p_prompt];
	}
	return "";
}

void AIAssistant::_cache_response(const String &p_prompt, const String &p_response) {
	// Simple cache with size limit
	if (response_cache.size() > 100) {
		response_cache.clear(); // Simple eviction
	}
	response_cache[p_prompt] = p_response;
}

AIAssistant *AIAssistant::get_singleton() {
	return singleton;
}

AIAssistant::AIAssistant() {
	singleton = this;
}

AIAssistant::~AIAssistant() {
	singleton = nullptr;
}