/* main.c - Program utama command-line tool "mtool" */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "cli.h"
#include "config.h"
#include "file_processor.h"
#include "logger.h"

/* Konfigurasi default bila file config ada. */
static const char *CONFIG_FILE = ".mtoolrc";

static int run_subcommand(const cli_args *args) {
    file_stats stats;

    switch (args->subcommand) {
        case CLI_SUB_HELP:
            cli_print_help(stdout);
            return 0;
        case CLI_SUB_VERSION:
            cli_print_version(stdout);
            return 0;
        case CLI_SUB_COUNT: {
            if (args->file_path == NULL) {
                /* Hitung baris dari stdin. */
                int c;
                long count = 0;
                while ((c = fgetc(stdin)) != EOF) {
                    if (c == '\n') {
                        count++;
                    }
                }
                printf("%ld\n", count);
                return 0;
            }
            if (file_stats_compute(args->file_path, &stats) != 0) {
                LOG_ERROR("tidak bisa membuka file: %s", args->file_path);
                return 1;
            }
            printf("%ld %s\n", stats.lines, args->file_path);
            return 0;
        }
        case CLI_SUB_HEAD:
            if (file_head(args->file_path, args->count) < 0) {
                LOG_ERROR("head gagal");
                return 1;
            }
            return 0;
        case CLI_SUB_TAIL:
            if (file_tail(args->file_path, args->count) < 0) {
                LOG_ERROR("tail gagal");
                return 1;
            }
            return 0;
        case CLI_SUB_STATS:
            if (file_stats_compute(args->file_path, &stats) != 0) {
                LOG_ERROR("tidak bisa membuka file: %s",
                          args->file_path ? args->file_path : "stdin");
                return 1;
            }
            printf("%8ld baris  %8ld kata  %8ld karakter  %s\n",
                   stats.lines, stats.words, stats.chars,
                   args->file_path ? args->file_path : "-");
            return 0;
        case CLI_SUB_GREP:
            if (args->pattern == NULL) {
                fprintf(stderr, "grep butuh PATTERN\n");
                return 1;
            }
            if (file_grep(args->file_path, args->pattern,
                          args->ignore_case) < 0) {
                LOG_ERROR("grep gagal");
                return 1;
            }
            return 0;
        case CLI_SUB_NONE:
        default:
            cli_print_help(stderr);
            return 1;
    }
}

int main(int argc, char *argv[]) {
    /* Inisialisasi logger default: level INFO ke stderr. */
    log_init(LOG_INFO, stderr);

    /* Muat config opsional bila ada. */
    config cfg;
    config_init(&cfg);
    if (config_load(&cfg, CONFIG_FILE) > 0) {
        const char *lvl = config_get(&cfg, "log_level");
        if (lvl != NULL) {
            if (strcmp(lvl, "DEBUG") == 0) {
                log_init(LOG_DEBUG, stderr);
            } else if (strcmp(lvl, "WARN") == 0) {
                log_init(LOG_WARN, stderr);
            } else if (strcmp(lvl, "ERROR") == 0) {
                log_init(LOG_ERROR, stderr);
            }
        }
    }

    cli_args args;
    if (cli_parse(argc, argv, &args) != 0) {
        fprintf(stderr, "Argumen tidak valid. Jalankan '%s help'.\n",
                argv[0]);
        return 2;
    }

    if (args.verbose) {
        log_init(LOG_DEBUG, stderr);
    }

    if (args.show_help) {
        cli_print_help(stdout);
        return 0;
    }
    if (args.show_version) {
        cli_print_version(stdout);
        return 0;
    }

    LOG_DEBUG("subcommand=%d file=%s",
               (int)args.subcommand,
               args.file_path ? args.file_path : "(stdin)");

    return run_subcommand(&args);
}