#include "common.h"
#include "chunk.h"
#include "debug.h"
#include "vm.h"

#include <time.h>
#include <string.h>

static void repl( VM* vm ) {
	char line[512];

	for ( ; ; ) {
		printf( "> " );
		if ( !fgets( line, sizeof(line), stdin ) ) {
			printf( "\n" ); break;
		}
		printf( "= %s", line );
		interpret( vm, line );
	}
}

static char* readFile( const char* path ) {
	FILE* file = fopen( path, "rb" );
	if ( file == NULL ) {
		fprintf( stderr, "Error opening file: \"%s\"\n", path );
		exit( 74 );
	}

	fseek( file, 0, SEEK_END );
	size_t sz = ftell( file );
	rewind( file );

	char* src = (char*)malloc( sz + 1 );
	if ( src == NULL ) {
		fprintf( stderr, "Error allocating memory for file: \"%s\"\n", path );
		exit( 74 );
	}
	size_t bread = fread( src, sizeof(char), sz, file );
	if ( bread < sz ) {
		fprintf( stderr, "Error reading file: \"%s\"\n", path );
		exit( 74 );
	}
	src[bread] = '\0';

	fclose( file );
	return src;
}

static void runFile( VM* vm, const char* path ) {
	char* source = readFile( path );
	InterpretResult res = interpret( vm, source );
	free( source );
	if ( res == INTERPRET_COMPILE_ERROR ) exit( 65 );
	if ( res == INTERPRET_RUNTIME_ERROR ) exit( 70 );
}

int main( int argc, char** argv ) {
	(void)argc; (void)argv;
	srand( time( NULL ) );

	VM vm;
	initVM( &vm );

	if ( argc == 1 ) {
		repl( &vm );
	} else if ( argc == 2 ) {
		runFile( &vm, argv[1] );
	} else {
		fprintf( stderr, "Usage: clox [path]\n" );
		//exit( EXIT_FAILURE );
	}

	freeVM( &vm );

	return EXIT_SUCCESS;
}

//void* malloc( size_t sz ) {}