/*
    AUTHOR:  Alexander Popov <iiiypuk {at} fastmail.fm>
    LICENSE: MIT-0
    REPO:    https://git.a2s.su/iiiypuk/minecraft-launcher-libs
*/

#include <stdio.h>
#include <string.h>
#include <cjson/cJSON.h>

#define VERSION "1.0.1" // software version

void usage();
void info(cJSON *json);
void generate_library_list(cJSON *input_json, cJSON *output_json, char output_system);

int main(int argc, char const *argv[])
{
    if (argc != 3)
    {
        usage();
    }
    else
    {
        FILE *fp;
        char str[900000];
        char buffer[100];

        fp = fopen(argv[1], "r");
        while (fgets(buffer, sizeof(buffer), fp)) {
            strcat(str, buffer);
        }
        fclose(fp);

        cJSON *json = cJSON_Parse(str);

        cJSON *launcher_libraries = cJSON_CreateObject();
        cJSON *libraries = cJSON_CreateArray();
        cJSON_AddItemToObject(launcher_libraries, "libraries", libraries);

        generate_library_list(json, launcher_libraries, argv[2][0]);
        int libraries_array_size = cJSON_GetArraySize(libraries);

        switch (argv[2][0])
        {
            default:
                usage();
                break;
            case 'i':
                info(json);
                break;
            case 'w':
                for (int i = 0; i < libraries_array_size; ++i)
                {
                    cJSON *library = cJSON_GetArrayItem(libraries, i);
                    printf("%%MC_DIR%%/libraries/%s;", cJSON_GetStringValue(library));
                }
                printf("%s\n", "%MC_DIR%/versions/%GAME_VERSION%/%GAME_VERSION%.jar");
                break;
            case 'l':
            case 'x':
                for (int i = 0; i < libraries_array_size; ++i)
                {
                    cJSON *library = cJSON_GetArrayItem(libraries, i);
                    printf("$MC_DIR/libraries/%s:", cJSON_GetStringValue(library));
                }
                printf("%s\n", "$MC_DIR/versions/$GAME_VERSION/$GAME_VERSION.jar");
                break;
        }
    }

    return 0;
}

void usage()
{
    printf("%s\n%s: %s\n\n", "Minecraft Libraries List Generator",
        "Version", VERSION);
    printf("%s\n", "Usage:");
    printf("  %s\n\n", "make-libs-string <version.json> <system>");
    printf("  %s\n\n", "<system> - w|l|x (windows or linux or osx)");
    printf("%s\n", "Other:");
    printf("  %s\n", "make-libs-string <version.json> i - to get version info");
}

void info(cJSON *json)
{
    char *minecraft_version = cJSON_GetStringValue(cJSON_GetObjectItem(json, "id"));
    printf("Minecraft Version: %s\n", minecraft_version);

    char *assets_version = cJSON_GetStringValue(cJSON_GetObjectItem(json, "assets"));
    printf("Minecraft Assets Version: %s\n", assets_version);

    cJSON *libraries = cJSON_GetObjectItem(json, "libraries");
    int libraries_array_size = cJSON_GetArraySize(libraries);
    printf("Minecraft libraries count: %d\n", libraries_array_size);
}

void generate_library_list(cJSON *input_json, cJSON *output_json, char output_system)
{
    cJSON *input_libraries = cJSON_GetObjectItem(input_json, "libraries");
    cJSON *output_libraries = cJSON_GetObjectItem(output_json, "libraries");
    int libraries_array_size = cJSON_GetArraySize(input_libraries);

    char *output_system_name;

    switch (output_system)
    {
        case 'w':
            output_system_name = "windows";
            break;
        case 'l':
            output_system_name = "linux";
            break;
        case 'x':
            output_system_name = "osx";
            break;
    }

    for (int i = 0; i < libraries_array_size; i++)
    {
        cJSON *library = cJSON_GetArrayItem(input_libraries, i);

        if (library != NULL)
        {
            cJSON *downloads = cJSON_GetObjectItem(library, "downloads");
            cJSON *artifact = cJSON_GetObjectItem(downloads, "artifact");

            cJSON *rules = cJSON_GetObjectItem(library, "rules");
            cJSON *rules_item = cJSON_GetArrayItem(rules, 0);
            cJSON *os_type = cJSON_GetObjectItem(rules_item, "os");
            char *os_name = cJSON_GetStringValue(cJSON_GetObjectItem(os_type, "name"));

            if (os_name != 0) {
                char *library_path = cJSON_GetStringValue(cJSON_GetObjectItem(artifact, "path"));

                if (strcmp(output_system_name, os_name) == 0) {
                    cJSON_AddItemToArray(output_libraries, cJSON_CreateString(library_path));
                }
            }
            else {
                char *library_path = cJSON_GetStringValue(cJSON_GetObjectItem(artifact, "path"));
                cJSON_AddItemToArray(output_libraries, cJSON_CreateString(library_path));
            }
        }
    }
}