#include "../include/common.h"
#include "../include/chunk.h"
#include "../include/debug.h"
#include "../include/vm.h"
#include <stdio.h>
#include <stdlib.h>

static void repl(){
    char line[1024];
    for(;;){
        printf("_> ");
        if(!fgets(line,sizeof(line),stdin)){
            printf("\n");
            break;
        }
        interpret(line);
    }
}

static char* readFile(const char *path){
    FILE *file = fopen(path,"rb");
    
    if(file == NULL){
        fprintf(stderr,"Could not open file \"%s\".\n",path);
        exit(74);
    }

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

    char *buffer = (char *)malloc(fileSize+1);
    if(buffer == NULL){
        fprintf(stderr,"Out of memory for \"%s\".\n",path);
        exit(74);
    }

    
    size_t bytesRead = fread(buffer, sizeof(char), fileSize, file);
    if(bytesRead < fileSize){
        fprintf(stderr,"Could not read file \"%s\".\n",path);
        exit(74);
    }

    
    buffer[bytesRead] = '\0';
    fclose(file);
    return buffer;

}

static void runFile(const char *path){
    char *source = readFile(path);
    InterpretResult result = interpret(source);
    free(source);

    if(result == INTERPRET_COMPILE_ERROR) exit(65);
    if(result == INTERPRET_RUNTIME_ERROR) exit(70);
}

int main(int argc, char *argv[]){
    initVM();

    if(argc == 1){
        repl();
    } else if(argc == 2){
        runFile(argv[1]);
    } else {
        fprintf(stderr,"Usage: Clox [path]\n");
        exit(64);
    }

    freeVM();
    return 0;
}