#include "action_list.h"
#include "file.h"
#include "myers.h"
#include "utilities.h"
// main.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>

static void usage(int exitcode) {
    printf("usage: merk <command> [<args>]\n\n  diff     Displays the difference between the given two files\n");
    exit(exitcode);
}

int main(int argc, char **argv) {
    if (argc == 2 && (!strcmp(argv[1], "-h") || !strcmp(argv[1], "--help"))) {
        usage(0);
    }

    const char* subcmd = argv[1];

    if (strcmp(subcmd, "diff") != 0) {
        fprintf(stderr, "ERROR: Unknown subcommand: '%s'\n", subcmd);
        usage(2);
    }

    if (strcmp(subcmd, "diff") == 0) {
        if (argc != 4) {
            printf("ERROR: too many/too little arguments given!\n");
            printf("Usage: merk diff <PATH> <PATH>");
            exit(1);
        }

        File* file1; 
        switch (get_path_type(argv[2])) {
            case PT_FILE: file1 = new_file(argv[2]); break;
            case PT_DIR: file1 = NULL; printf("ERROR: first path is a directory and no file!"); break;
            case PT_NOEXIST: file1 = NULL; printf("ERROR: first path does not exist!"); break;
            default: file1 = NULL; printf("ERROR: unknown first path!");
        }
        if (!file1) exit(1);
        File* file2;
        switch (get_path_type(argv[3])) {
            case PT_FILE: file2 = new_file(argv[3]); break;
            case PT_DIR: file2 = NULL; printf("ERROR: second path is a directory and no file!"); break;
            case PT_NOEXIST: file2 = NULL; printf("ERROR: second path does not exist!"); break;
            default: file2 = NULL; printf("ERROR: unknown second path!");
        }
        if (!file2) exit(1);

        ActionList* actions = myers_diff(file1, file2, 0, 0);
        if (!actions) printf("ERROR: something went wrong while taking the diff!");
        else visualize_diff(file1, file2, actions);
    }
    else {
        usage(1);
    }

    return 0;
}