/*
 * This code is part of the programming language flup
 * flup comes with ABSOLUTELY NO WARRANTY and is licensed under AGPL-3.0 or later.
 *    Copyright (C) 2024  VegOwOtenks
 *
 * This program 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 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

#include <stdlib.h>
#include <stdio.h>

#include "../submodules/utilitiec/src/argumentc/argumentc.h"
#include "interpreter.h"
#include "tokenizer.h"

int tokenize_all(StringView source, DynamicArray* a)
{
	Token t;
	while ((t = Tokenizer_NextToken(&source)).type != TOKENTYPE_NONE) {
		int append_code = DynamicArray_Append(a, &t);
		if (append_code) return append_code;
		if (t.type == TOKENTYPE_ERROR) break;
	}

	return EXIT_SUCCESS;
}

char* load_file_string(StringView path)
{
	FILE* stream = fopen(path.source, "rb");
	if (stream == NULL) {
		fprintf(stderr, "Fatal Error: Failed to open file at %*s\n", (int) path.length, path.source);
		return NULL;
	}

	if (fseek(stream, 0, SEEK_END)) {
		perror("fseek");
		return NULL;
	}

	long length = ftell(stream);
	if (length == -1) {
		perror("ftell");
		return NULL;
	}

	if (fseek(stream, 0, SEEK_SET)) {
		perror("fseek");
		return NULL;
	}

	char* buffer = malloc(length + 1);
	if (buffer == NULL) {
		fprintf(stderr, "Fatal Error: Failed to allocate %li bytes\n", length);
		return NULL;
	}

	size_t objects_read = fread(buffer, 1, length, stream);
	if (objects_read != (size_t) length) {
		fprintf(stderr, "Fatal Error: Failed read %li bytes from script file, got only %li\n", length, objects_read);
		free(buffer);
		return NULL;
	}

	fclose(stream);

	buffer[length] = '\0';

	return buffer;
}

int main(int argc, const char* argv []) 
{
	Argumentc arguments;
	Argumentc_Create(&arguments, argc, argv);

	Option script_file = Argumentc_PopLongArgument(&arguments, StringView_FromString("file")).argument;
	if (script_file.type == OPTIONTYPE_NONE) {
		fprintf(stderr, "Usage: [program] --file path/to/script_file\n");
		return 1;
	}
	Argumentc_Destroy(&arguments);

	char* script_string = load_file_string(script_file.content);
	if (script_string == NULL) return 1;

	StringView source   = StringView_FromString(script_string);
	DynamicArray tokens;
	if (DynamicArray_Create(&tokens, sizeof(Token), 128, NULL)) {
		fprintf(stderr, "Fatal Error: Failed to create dynamicarray\n");
		return 1;
	}

	if (tokenize_all(source, &tokens)) {
		fprintf(stderr, "Fatal Error: Out of Memory in tokenizing\n");
		return 1;
	}

	Interpreter interpreter;
	Interpreter_Create(&interpreter, &tokens);


	int interpret_code = Interpreter_Interpret(&interpreter);

	Interpreter_Destroy(&interpreter);
	DynamicArray_Destroy(&tokens);

	free(script_string);

	return interpret_code;
}