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

#include <time.h>

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

	for ( ; ; ) {
		printf( "> " );
		if ( !fgets( line, sizeof(line), stdin ) ) {
			printf( "\n" ); break;
		}
		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 ) );

	double dfp = 22.0 / 7.0;
	printf( "DFP: %.64g\n", dfp );

	float ffp = 22.0f / 7.0f;
	printf( "FFP: %.64f\n", ffp );

	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 );
	}

	/*Chunk c;
	initChunk( &c );
	//c.bDebug = false;

	writeConstant( &c, 4.2f, 1 );
	writeConstant( &c, rand()/(float)RAND_MAX, 2 );

	//for ( int i = 0; i < 10; ++i )
	//	writeChunk( &c, rand() % NUM_OP, 5 );

	// const overload
	for ( int i = 2; i < 6; ++i ) {
		writeConstant( &c, (float)rand()/RAND_MAX, 6 );
	}

	writeConstant( &c, 69069, 9 );
	writeChunk( &c, OP_NEGATE, 9 );

	writeConstant( &c, 22, 9 );
	writeChunk( &c, OP_ADD, 9 );

	writeConstant( &c, 42, 9 );
	writeChunk( &c, OP_DIVIDE, 9 );

	writeChunk( &c, OP_RETURN, 10 );

	//disassembleChunk( &c, "test" );

	interpret( &vm, &c );
	printChunkInfo( &c, "test" );

	printf( "vm %u chunk %u valar %u\n", sizeof(VM), sizeof(Chunk), sizeof(ValueArray) );

	freeChunk( &c );*/

	freeVM( &vm );

	return EXIT_SUCCESS;
}

//void* malloc( size_t sz ) {}