/*
 * =====================================================================================
 *
 *       Filename:  main.c
 *
 *    Description:  Emulator main loop 
 *
 *        Version:  1.0
 *        Created:  2023-09-21 09:50:34 PM
 *       Revision:  none
 *       Compiler:  gcc
 *
 *         Author:  William Nolin, 
 *   Organization:  
 *
 * =====================================================================================
 */
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include "log.h"

#include "include/rom.h"
#include "include/system.h"
#include "gui.h"

struct log_files {
    FILE *info;
    FILE *debug;
};
struct log_files log_files;

FILE *add_log_file(char *name, int level) {
    char *full_name = malloc((5 + strlen(name)) * sizeof(char));
    strcpy(full_name, "logs/");
    strcat(full_name, name);

    FILE *log_file = fopen(full_name, "w");
    if (!log_file) {
        perror("fopen");
        int fopen_err = errno;
        log_error("Failed to open log file '%s': %s", full_name, strerror(fopen_err));
        return NULL;
    }

    log_add_fp(log_file, level);
    return log_file;
}

void init_logging() {
    log_set_level(LOG_INFO);

    // Print current working directory
    char cwd[256];
    if (getcwd(cwd, 256) == NULL) {
        int getcwd_error = errno;
        log_error("Failed to read current working directory: %s", strerror(getcwd_error));
        return;
    }
    log_info("Using working directory '%s'", cwd);

    // Make sure log directory exists
    char *folder_name = "logs/";
    struct stat sb;
    if (stat(folder_name, &sb) != 0 || !S_ISDIR(sb.st_mode)) {
        if (mkdir(folder_name, 0755) == 0) {
            log_debug("Created logs folder");
        } else {
            log_error("Failed to create logs folder: %s", strerror(errno));
            return;
        }
    }

    log_files.info = add_log_file("nes.log", LOG_INFO);
#if DEBUG
    log_files.debug = add_log_file("nes_debug.log", LOG_DEBUG);
#endif
}

void close_logging() {
    fclose(log_files.info);

#if DEBUG
    fclose(log_files.debug);
#endif
}

int main() {
    char *rom_path = "./test_roms/dk_japan.nes";
//    char *rom_path = "./test_roms/smb.nes";

    init_logging();

    if (!gui_init()) {
        return EXIT_FAILURE;
    }

    system_init();

    if (!rom_load(rom_path)) {
        system_uninit();
        gui_free();
        return EXIT_FAILURE;
    }

    system_start();

    while (true) {
        if (gui_input() < 0) {
            // The main window has been closed, stop the emulation
            break;
        }

        system_next_frame();
        gui_render();

        // Delay the next frame to lock the emulation to 60hz
        gui_delay();
    }

    system_uninit();
    rom_unload();
    gui_free();

    close_logging();

    return EXIT_SUCCESS;
}