#include "fastfetch.h"
#include "common/ffdata.h"
#include "detection/version/version.h"
#include "logo/logo.h"
#include "common/commandoption.h"
#include "common/init.h"
#include "common/io.h"
#include "common/jsonconfig.h"
#include "common/time.h"
#include "common/stringUtils.h"
#include "common/mallocHelper.h"
#include "fastfetch_datatext.h"

#include <stdlib.h>
#include <ctype.h>
#include <string.h>

static void printCommandFormatHelpJson(void) {
    yyjson_mut_doc* doc = yyjson_mut_doc_new(NULL);
    yyjson_mut_val* root = yyjson_mut_obj(doc);
    yyjson_mut_doc_set_root(doc, root);

    for (uint32_t i = 0; i <= 'Z' - 'A'; ++i) {
        for (FFModuleBaseInfo** modules = ffModuleInfos[i]; *modules; ++modules) {
            FFModuleBaseInfo* baseInfo = *modules;
            if (!baseInfo->formatArgs.count) {
                continue;
            }

            FF_STRBUF_AUTO_DESTROY type = ffStrbufCreateS(baseInfo->name);
            ffStrbufLowerCase(&type);
            ffStrbufAppendS(&type, "Format");

            yyjson_mut_val* obj = yyjson_mut_obj(doc);
            if (yyjson_mut_obj_add(root, yyjson_mut_strbuf(doc, &type), obj)) {
                FF_STRBUF_AUTO_DESTROY content = ffStrbufCreateF("Output format for the `%s` module. See Wiki for formatting syntax\n", baseInfo->name);
                for (unsigned i = 0; i < baseInfo->formatArgs.count; i++) {
                    const FFModuleFormatArg* arg = &baseInfo->formatArgs.args[i];
                    ffStrbufAppendF(&content, "    %u. {%s}: %s\n", i + 1, arg->name, arg->desc);
                }
                ffStrbufTrimRight(&content, '\n');
                yyjson_mut_obj_add_strbuf(doc, obj, "description", &content);
                yyjson_mut_obj_add_str(doc, obj, "type", "string");
            }
        }
    }
    yyjson_mut_write_fp(stdout, doc, YYJSON_WRITE_PRETTY, NULL, NULL);
    putchar('\n');
    yyjson_mut_doc_free(doc);
}

static void printCommandFormatHelp(const char* command) {
    FF_STRBUF_AUTO_DESTROY type = ffStrbufCreateNS((uint32_t) (strlen(command) - strlen("-format")), command);
    ffStrbufLowerCase(&type);
    for (FFModuleBaseInfo** modules = ffModuleInfos[toupper(command[0]) - 'A']; *modules; ++modules) {
        FFModuleBaseInfo* baseInfo = *modules;
        if (ffStrbufIgnCaseEqualS(&type, baseInfo->name)) {
            if (baseInfo->formatArgs.count > 0) {
                FF_STRBUF_AUTO_DESTROY variable = ffStrbufCreate();
                printf("-- In config file: { \"type\": \"%s\", \"format\": \"{<format-variable>}\" }\n", type.chars);
                printf("Sets the format string for %s output.\n", baseInfo->name);
                puts("To see how a format string is constructed, take a look at https://github.com/fastfetch-cli/fastfetch/wiki/Format-String-Guide.");
                puts("The following variables are passed:");

                uint32_t maxWidth = 20;
                for (unsigned i = 0; i < baseInfo->formatArgs.count; i++) {
                    uint32_t len = (uint32_t) strlen(baseInfo->formatArgs.args[i].name) + 2;
                    if (len > maxWidth) {
                        maxWidth = len;
                    }
                }

                for (unsigned i = 0; i < baseInfo->formatArgs.count; i++) {
                    const FFModuleFormatArg* arg = &baseInfo->formatArgs.args[i];
                    ffStrbufSetF(&variable, "{%s}", arg->name);
                    printf("%*s: %s\n", (int) maxWidth, variable.chars, arg->desc);
                }
            } else {
                fprintf(stderr, "Error: Module '%s' doesn't support output formatting\n", baseInfo->name);
            }
            return;
        }
    }

    fprintf(stderr, "Error: Module '%s' is not supported\n", type.chars);
}

static void printFullHelp() {
    fputs("Fastfetch is a neofetch-like tool for fetching system information and displaying them in a pretty way\n\n", stdout);
    if (!instance.config.display.pipe) {
        fputs("\e[1;4mUsage:\e[m \e[1mfastfetch\e[m \e[3m<?options>\e[m\n\n", stdout);
    } else {
        fputs("Usage: fastfetch <?options>\n\n", stdout);
    }

    yyjson_doc* doc = yyjson_read(FASTFETCH_DATATEXT_JSON_HELP, strlen(FASTFETCH_DATATEXT_JSON_HELP), YYJSON_READ_NOFLAG);
    assert(doc);
    yyjson_val *groupKey, *flagArr;
    size_t groupIdx, groupMax;
    yyjson_obj_foreach (yyjson_doc_get_root(doc), groupIdx, groupMax, groupKey, flagArr) {
        if (!instance.config.display.pipe) {
            fputs("\e[1;4m", stdout);
        }
        printf("%s options:", yyjson_get_str(groupKey));
        if (!instance.config.display.pipe) {
            fputs("\e[m", stdout);
        }
        putchar('\n');

        yyjson_val* flagObj;
        size_t flagIdx, flagMax;
        yyjson_arr_foreach (flagArr, flagIdx, flagMax, flagObj) {
            yyjson_val* shortKey = yyjson_obj_get(flagObj, "short");
            if (shortKey) {
                fputs("  ", stdout);
                if (!instance.config.display.pipe) {
                    fputs("\e[1m", stdout);
                }
                printf("-%s", yyjson_get_str(shortKey));
                if (!instance.config.display.pipe) {
                    fputs("\e[m", stdout);
                }
                fputs(", ", stdout);
            } else {
                fputs("      ", stdout);
            }
            yyjson_val* longKey = yyjson_obj_get(flagObj, "long");
            assert(longKey);
            if (!instance.config.display.pipe) {
                fputs("\e[1m", stdout);
            }
            printf("--%s", yyjson_get_str(longKey));
            if (!instance.config.display.pipe) {
                fputs("\e[m", stdout);
            }

            yyjson_val* argObj = yyjson_obj_get(flagObj, "arg");
            if (argObj) {
                yyjson_val* typeKey = yyjson_obj_get(argObj, "type");
                assert(typeKey);
                yyjson_val* optionalKey = yyjson_obj_get(argObj, "optional");
                bool optional = optionalKey && yyjson_get_bool(optionalKey);
                putchar(' ');
                if (!instance.config.display.pipe) {
                    fputs("\e[3m", stdout);
                }
                printf("<%s%s>", optional ? "?" : "", yyjson_get_str(typeKey));
                if (!instance.config.display.pipe) {
                    fputs("\e[m", stdout);
                }
            }

            yyjson_val* descKey = yyjson_obj_get(flagObj, "desc");
            assert(descKey);
            if (yyjson_is_arr(descKey)) {
                if (instance.config.display.pipe) {
                    putchar(':');
                }

                yyjson_val* descStr;
                size_t descIdx, descMax;
                yyjson_arr_foreach (descKey, descIdx, descMax, descStr) {
                    if (!instance.config.display.pipe) {
                        printf("\e[46G%s\n", yyjson_get_str(descStr));
                    } else {
                        printf(" %s", yyjson_get_str(descStr));
                    }
                }
                if (instance.config.display.pipe) {
                    putchar('\n');
                }
            } else {
                if (!instance.config.display.pipe) {
                    fputs("\e[46G", stdout);
                } else {
                    fputs(": ", stdout);
                }
                puts(yyjson_get_str(descKey));
            }
        }

        putchar('\n');
    }
    yyjson_doc_free(doc);

    puts("\n\
Command flags are not case sensitive. E.g. `--print-logos` is equal to `--Print-Logos`\n\
If a value starts with a ?, it is optional. An optional boolean value defaults to true if not specified.\n\
More detailed help messages for each options can be printed with `-h <option_without_dash_prefix>`\n\
For detailed information on logo options, module configuration, and formatting, visit:\n\
      https://github.com/fastfetch-cli/fastfetch/wiki/Configuration");
}

static bool printSpecificCommandHelp(const char* command) {
    yyjson_doc* doc = yyjson_read(FASTFETCH_DATATEXT_JSON_HELP, strlen(FASTFETCH_DATATEXT_JSON_HELP), YYJSON_READ_NOFLAG);
    assert(doc);
    yyjson_val *groupKey, *flagArr;
    size_t groupIdx, groupMax;
    yyjson_obj_foreach (yyjson_doc_get_root(doc), groupIdx, groupMax, groupKey, flagArr) {
        yyjson_val* flagObj;
        size_t flagIdx, flagMax;
        yyjson_arr_foreach (flagArr, flagIdx, flagMax, flagObj) {
            yyjson_val* pseudo = yyjson_obj_get(flagObj, "pseudo");
            if (pseudo && yyjson_get_bool(pseudo)) {
                continue;
            }

            yyjson_val* longKey = yyjson_obj_get(flagObj, "long");
            assert(longKey);
            if (ffStrEqualsIgnCase(command, yyjson_get_str(longKey))) {
                puts(yyjson_get_str(yyjson_obj_get(flagObj, "desc")));

                printf("%10s: ", "Usage");
                yyjson_val* shortKey = yyjson_obj_get(flagObj, "short");
                if (shortKey) {
                    if (!instance.config.display.pipe) {
                        fputs("\e[1m", stdout);
                    }
                    printf("-%s", yyjson_get_str(shortKey));
                    if (!instance.config.display.pipe) {
                        fputs("\e[m", stdout);
                    }
                    fputs(", ", stdout);
                }
                if (!instance.config.display.pipe) {
                    fputs("\e[1m", stdout);
                }
                printf("--%s", yyjson_get_str(longKey));
                if (!instance.config.display.pipe) {
                    fputs("\e[m", stdout);
                }

                yyjson_val* argObj = yyjson_obj_get(flagObj, "arg");
                if (argObj) {
                    yyjson_val* typeKey = yyjson_obj_get(argObj, "type");
                    assert(typeKey);
                    yyjson_val* optionalKey = yyjson_obj_get(argObj, "optional");
                    bool optional = optionalKey && yyjson_get_bool(optionalKey);
                    putchar(' ');
                    if (!instance.config.display.pipe) {
                        fputs("\e[3m", stdout);
                    }
                    printf("<%s%s>", optional ? "?" : "", yyjson_get_str(typeKey));
                    if (!instance.config.display.pipe) {
                        fputs("\e[m", stdout);
                    }
                    putchar('\n');

                    yyjson_val* defaultKey = yyjson_obj_get(argObj, "default");
                    if (defaultKey) {
                        if (ffStrEqualsIgnCase(yyjson_get_str(typeKey), "structure")) {
                            printf("%10s: %s\n", "Default", FASTFETCH_DATATEXT_STRUCTURE);
                        } else if (yyjson_is_bool(defaultKey)) {
                            printf("%10s: %s\n", "Default", yyjson_get_bool(defaultKey) ? "true" : "false");
                        } else if (yyjson_is_num(defaultKey)) {
                            printf("%10s: %d\n", "Default", yyjson_get_int(defaultKey));
                        } else if (yyjson_is_str(defaultKey)) {
                            printf("%10s: %s\n", "Default", yyjson_get_str(defaultKey));
                        } else {
                            printf("%10s: Unknown\n", "Default");
                        }
                    }

                    yyjson_val* enumKey = yyjson_obj_get(argObj, "enum");
                    if (enumKey) {
                        printf("%10s:\n", "Options");
                        yyjson_val *optKey, *optVal;
                        size_t optIdx, optMax;
                        yyjson_obj_foreach (enumKey, optIdx, optMax, optKey, optVal) {
                            printf("%12s: %s\n", yyjson_get_str(optKey), yyjson_get_str(optVal));
                        }
                    }
                } else {
                    putchar('\n');
                }

                yyjson_val* remarkKey = yyjson_obj_get(flagObj, "remark");
                if (remarkKey) {
                    if (yyjson_is_str(remarkKey)) {
                        printf("%10s: %s\n", "Remark", yyjson_get_str(remarkKey));
                    } else if (yyjson_is_arr(remarkKey) && yyjson_arr_size(remarkKey) > 0) {
                        yyjson_val* remarkStr;
                        size_t remarkIdx, remarkMax;
                        yyjson_arr_foreach (remarkKey, remarkIdx, remarkMax, remarkStr) {
                            if (remarkIdx == 0) {
                                printf("%10s: %s\n", "Remark", yyjson_get_str(remarkStr));
                            } else {
                                printf("            %s\n", yyjson_get_str(remarkStr));
                            }
                        }
                    }
                }

                yyjson_doc_free(doc);
                return true;
            }
        }
    }

    yyjson_doc_free(doc);
    return false;
}

static void printCommandHelp(const char* command) {
    if (command == NULL) {
        printFullHelp();
    } else if (ffStrEqualsIgnCase(command, "format-json")) {
        printCommandFormatHelpJson();
    } else if (ffCharIsEnglishAlphabet(command[0]) && ffStrEndsWithIgnCase(command, "-format")) { // <module>-format
        printCommandFormatHelp(command);
    } else if (!printSpecificCommandHelp(command)) {
        fprintf(stderr, "Error: No specific help for command '%s' provided\n", command);
    }
}

static void listAvailablePresets(bool pretty) {
    FF_LIST_FOR_EACH (FFstrbuf, path, instance.state.platform.dataDirs) {
        ffStrbufAppendS(path, "fastfetch/presets/");
        ffListFilesRecursively(path->chars, pretty);
    }

    if (instance.state.platform.exePath.length) {
        FF_STRBUF_AUTO_DESTROY absolutePath = ffStrbufCreateCopy(&instance.state.platform.exePath);
        ffStrbufSubstrBeforeLastC(&absolutePath, '/');
        ffStrbufAppendS(&absolutePath, "/presets/");
        ffListFilesRecursively(absolutePath.chars, pretty);
    }
}

static void listAvailableLogos(void) {
    FF_LIST_FOR_EACH (FFstrbuf, path, instance.state.platform.dataDirs) {
        ffStrbufAppendS(path, "fastfetch/logos/");
        ffListFilesRecursively(path->chars, true);
    }
}

static void listConfigPaths(void) {
    FF_LIST_FOR_EACH (FFstrbuf, folder, instance.state.platform.configDirs) {
        bool exists = false;
        uint32_t length = folder->length + (uint32_t) strlen("fastfetch") + 1 /* trailing slash */;
        ffStrbufAppendS(folder, "fastfetch/config.jsonc");
        exists = ffPathExists(folder->chars, FF_PATHTYPE_FILE);
        ffStrbufSubstrBefore(folder, length);
        printf("%s%s\n", folder->chars, exists ? " (*)" : "");
    }
}

static void listDataPaths(void) {
    FF_LIST_FOR_EACH (FFstrbuf, folder, instance.state.platform.dataDirs) {
        ffStrbufAppendS(folder, "fastfetch/");
        puts(folder->chars);
    }
}

static void listModules(bool pretty) {
    unsigned count = 0;
    for (int i = 0; i <= 'Z' - 'A'; ++i) {
        for (FFModuleBaseInfo** modules = ffModuleInfos[i]; *modules; ++modules) {
            ++count;
            if (pretty) {
                printf("%d)%s%-14s: %s\n", count, count > 9 ? " " : "  ", (*modules)->name, (*modules)->description);
            } else {
                printf("%s:%s\n", (*modules)->name, (*modules)->description);
            }
        }
    }
}

static bool parseJsoncFile(FFdata* data, const char* path, yyjson_read_flag flg) {
    assert(!data->configDoc);

    {
        yyjson_read_err error;
        data->configDoc = path
            ? yyjson_read_file(path, flg, NULL, &error)
            : yyjson_read_fp(stdin, flg, NULL, &error);
        if (!data->configDoc) {
            if (error.code != YYJSON_READ_ERROR_FILE_OPEN) {
                if (path) {
                    size_t row = 0, col = error.pos;
                    FF_STRBUF_AUTO_DESTROY content = ffStrbufCreate();
                    if (ffAppendFileBuffer(path, &content)) {
                        yyjson_locate_pos(content.chars, content.length, error.pos, &row, &col, NULL);
                    }
                    fprintf(stderr, "Error: failed to parse JSON config file `%s` at (%zu, %zu): %s\n", path, row, col, error.msg);
                } else {
                    fprintf(stderr, "Error: failed to parse JSON from stdin at %zu: %s\n", error.pos, error.msg);
                }

                exit(477);
            }
            return false;
        }
    }

    {
        const char* error = NULL;

        yyjson_val* const root = yyjson_doc_get_root(data->configDoc);
        if (!yyjson_is_obj(root)) {
            error = "Invalid JSON config format. Root value must be an object";
        }

        if (
            error ||
            (error = ffOptionsParseLogoJsonConfig(&instance.config.logo, root)) ||
            (error = ffOptionsParseGeneralJsonConfig(&instance.config.general, root)) ||
            (error = ffOptionsParseDisplayJsonConfig(&instance.config.display, root)) ||
            false) {
            fprintf(stderr, "JsonConfig Error: %s\n", error);
            exit(477);
        }
    }

    return true;
}

static void generateConfigFile(FFdata* data, bool force, const char* filePath, bool fullConfig) {
    if (data->resultDoc) {
        fprintf(stderr, "Error: duplicated `--gen-config` or `--format json` flags found\n");
        exit(477);
    }

    if (!filePath) {
        if (instance.state.platform.configDirs.length == 0) {
            fprintf(stderr, "Error: No config directory found to generate config file in. Use --gen-config <path> to specify a path\n");
            exit(477);
        }

        FFstrbuf* configDir = FF_LIST_FIRST(FFstrbuf, instance.state.platform.configDirs);
        ffStrbufEnsureFixedLengthFree(&data->genConfigPath, configDir->length + strlen("fastfetch/config.jsonc"));
        ffStrbufSet(&data->genConfigPath, configDir);
        ffStrbufAppendS(&data->genConfigPath, "fastfetch/config.jsonc");
    } else {
        ffStrbufSetS(&data->genConfigPath, filePath);
    }

    if (!force && ffPathExists(data->genConfigPath.chars, FF_PATHTYPE_ANY)) {
        fprintf(stderr, "Error: file `%s` exists. Use `--gen-config%s-force` to overwrite\n", data->genConfigPath.chars, fullConfig ? "-full" : "");
        exit(477);
    }

    data->docType = fullConfig ? FF_RESULT_DOC_TYPE_CONFIG_FULL : FF_RESULT_DOC_TYPE_CONFIG;
    data->resultDoc = yyjson_mut_doc_new(NULL);
}

static void optionParseConfigFile(FFdata* data, const char* key, const char* value) {
    if (data->configLoaded) {
        fprintf(stderr, "Error: only one config file can be loaded\n");
        exit(413);
    }

    data->configLoaded = true;

    if (value == NULL) {
        fprintf(stderr, "Error: usage: %s <config>\n", key);
        exit(413);
    }

    if (value[0] == '\0' || ffStrEqualsIgnCase(value, "none")) {
        return;
    }

    if (value[0] == '-' && value[1] == '\0') {
        parseJsoncFile(data, NULL, false);
        return;
    }

    // Try to load as an absolute path

    FF_STRBUF_AUTO_DESTROY absolutePath = ffStrbufCreateA(128);
    ffStrbufSetS(&absolutePath, value);
    bool strictJson = ffStrbufEndsWithIgnCaseS(&absolutePath, ".json");
    bool jsonc = !strictJson && ffStrbufEndsWithIgnCaseS(&absolutePath, ".jsonc");
    bool json5 = !strictJson && !jsonc && ffStrbufEndsWithIgnCaseS(&absolutePath, ".json5");
    bool needExtension = !strictJson && !jsonc && !json5;
    if (needExtension) {
        ffStrbufAppendS(&absolutePath, ".jsonc");
    }

    yyjson_read_flag flag = strictJson
        ? 0
        : jsonc
        ? YYJSON_READ_ALLOW_COMMENTS | YYJSON_READ_ALLOW_TRAILING_COMMAS
        : YYJSON_READ_JSON5;

    if (parseJsoncFile(data, absolutePath.chars, flag)) {
        return;
    }

    // Try to load as a relative path with the config directory

    FF_LIST_FOR_EACH (FFstrbuf, path, instance.state.platform.configDirs) {
        ffStrbufSet(&absolutePath, path);
        ffStrbufAppendS(&absolutePath, "fastfetch/");
        ffStrbufAppendS(&absolutePath, value);
        if (needExtension) {
            ffStrbufAppendS(&absolutePath, ".jsonc");
        }

        if (parseJsoncFile(data, absolutePath.chars, flag)) {
            return;
        }
    }

    // Try to load as a preset

    FF_LIST_FOR_EACH (FFstrbuf, path, instance.state.platform.dataDirs) {
        ffStrbufSet(&absolutePath, path);
        ffStrbufAppendS(&absolutePath, "fastfetch/presets/");
        ffStrbufAppendS(&absolutePath, value);
        if (needExtension) {
            ffStrbufAppendS(&absolutePath, ".jsonc");
        }

        if (parseJsoncFile(data, absolutePath.chars, flag)) {
            return;
        }
    }

    // Try to load as a relative path with the directory of fastfetch binary, for Windows support

    if (instance.state.platform.exePath.length) {
        uint32_t lastSlash = ffStrbufLastIndexC(&instance.state.platform.exePath, '/') + 1;
        assert(lastSlash < instance.state.platform.exePath.length);

        // Try {exePath}/
        ffStrbufSetNS(&absolutePath, lastSlash, instance.state.platform.exePath.chars);
        ffStrbufAppendS(&absolutePath, value);
        if (needExtension) {
            ffStrbufAppendS(&absolutePath, ".jsonc");
        }
        if (parseJsoncFile(data, absolutePath.chars, flag)) {
            return;
        }

        // Try {exePath}/presets/
        ffStrbufSubstrBefore(&absolutePath, lastSlash);
        ffStrbufAppendS(&absolutePath, "presets/");
        ffStrbufAppendS(&absolutePath, value);
        if (needExtension) {
            ffStrbufAppendS(&absolutePath, ".jsonc");
        }
        if (parseJsoncFile(data, absolutePath.chars, flag)) {
            return;
        }
    }

    // File not found

    fprintf(stderr, "Error: couldn't find config: %s\n", value);
    exit(414);
}

static void printVersion() {
    FFVersionResult* result = &ffVersionResult;
    printf("%s %s%s%s (%s)\n", result->projectName, result->version, result->versionTweak, result->debugMode ? "-debug" : "", result->architecture);
}

static void enableJsonOutput(FFdata* data) {
    if (data->resultDoc) {
        fprintf(stderr, "Error: duplicated `--gen-config` or `--format json` flags found\n");
        exit(477);
    }

    data->resultDoc = yyjson_mut_doc_new(NULL);
    data->docType = FF_RESULT_DOC_TYPE_JSON;
    yyjson_mut_doc_set_root(data->resultDoc, yyjson_mut_arr(data->resultDoc));
}

static void parseCommand(FFdata* data, char* key, char* value) {
    if (ffStrEqualsIgnCase(key, "-h") || ffStrEqualsIgnCase(key, "--help")) {
        printCommandHelp(value);
        exit(0);
    }
    if (ffStrEqualsIgnCase(key, "--help-raw")) {
        puts(FASTFETCH_DATATEXT_JSON_HELP);
        exit(0);
    } else if (ffStrEqualsIgnCase(key, "-v") || ffStrEqualsIgnCase(key, "--version")) {
        printVersion();
        exit(0);
    } else if (ffStrEqualsIgnCase(key, "--version-raw")) {
        puts(FASTFETCH_PROJECT_VERSION);
        exit(0);
    } else if (ffStrStartsWithIgnCase(key, "--print-")) {
        const char* subkey = key + strlen("--print-");
        if (ffStrEndsWithIgnCase(subkey, "structure")) {
            puts(FASTFETCH_DATATEXT_STRUCTURE);
        } else if (ffStrEqualsIgnCase(subkey, "logos")) {
            ffLogoBuiltinPrint();
        } else {
            fprintf(stderr, "Error: unsupported print option: %s\n", key);
            exit(415);
        }
        exit(0);
    } else if (ffStrStartsWithIgnCase(key, "--list-")) {
        const char* subkey = key + strlen("--list-");
        if (ffStrEqualsIgnCase(subkey, "modules")) {
            listModules(!value || !ffStrEqualsIgnCase(value, "autocompletion"));
        } else if (ffStrEqualsIgnCase(subkey, "presets")) {
            listAvailablePresets(!value || !ffStrEqualsIgnCase(value, "autocompletion"));
        } else if (ffStrEqualsIgnCase(subkey, "config-paths")) {
            listConfigPaths();
        } else if (ffStrEqualsIgnCase(subkey, "data-paths")) {
            listDataPaths();
        } else if (ffStrEqualsIgnCase(subkey, "features")) {
            ffListFeatures();
        } else if (ffStrEqualsIgnCase(subkey, "logos")) {
            if (value) {
                if (ffStrEqualsIgnCase(value, "autocompletion")) {
                    ffLogoBuiltinListAutocompletion();
                } else if (ffStrEqualsIgnCase(value, "builtin")) {
                    ffLogoBuiltinList();
                } else if (ffStrEqualsIgnCase(value, "custom")) {
                    listAvailableLogos();
                } else {
                    fprintf(stderr, "Error: unsupported logo type: %s\n", value);
                    exit(415);
                }
            } else {
                puts("Builtin logos:");
                ffLogoBuiltinList();
                puts("\nCustom logos:");
                listAvailableLogos();
            }
        } else {
            fprintf(stderr, "Error: unsupported list option: %s\n", key);
            exit(415);
        }

        exit(0);
    } else if (ffStrEqualsIgnCase(key, "--gen-config")) {
        generateConfigFile(data, false, value, false);
    } else if (ffStrEqualsIgnCase(key, "--gen-config-force")) {
        generateConfigFile(data, true, value, false);
    } else if (ffStrEqualsIgnCase(key, "--gen-config-full")) {
        generateConfigFile(data, false, value, true);
    } else if (ffStrEqualsIgnCase(key, "--gen-config-full-force")) {
        generateConfigFile(data, true, value, true);
    } else if (ffStrEqualsIgnCase(key, "-c") || ffStrEqualsIgnCase(key, "--config")) {
        optionParseConfigFile(data, key, value);
    } else if (ffStrEqualsIgnCase(key, "-j") || ffStrEqualsIgnCase(key, "--json")) {
        if (ffOptionParseBoolean(value)) {
            enableJsonOutput(data);
        }
    } else if (ffStrEqualsIgnCase(key, "--format")) {
        if (!!ffOptionParseEnum(key, value, (FFKeyValuePair[]) {
                                                { "default", false },
                                                { "json", true },
                                                {},
                                            })) {
            enableJsonOutput(data);
        }
    } else if (ffStrEqualsIgnCase(key, "--dynamic-interval")) {
        instance.state.dynamicInterval = ffOptionParseUInt32(key, value); // seconds to milliseconds
    } else {
        return;
    }

    // Don't parse it again in parseOption.
    // This is necessary because parseOption doesn't understand this option and will result in an unknown option error.
    key[0] = '\0';
    if (value) {
        value[0] = '\0';
    }
}

static void parseOption(FFdata* data, const char* key, const char* value) {
    if (ffStrEqualsIgnCase(key, "-s") || ffStrEqualsIgnCase(key, "--structure")) {
        ffOptionParseString(key, value, &data->structure);
    }

    else if (
        ffOptionsParseGeneralCommandLine(&instance.config.general, key, value) ||
        ffOptionsParseLogoCommandLine(&instance.config.logo, key, value) ||
        ffOptionsParseDisplayCommandLine(&instance.config.display, key, value) ||
        ffParseModuleOptions(key, value)) {
    }

    else if (ffStrEqualsIgnCase(key, "--structure-disabled")) {
        ffOptionParseString(key, value, &data->structureDisabled);
    }

    else {
        fprintf(stderr, "Error: unknown option: %s\n", key);
        exit(400);
    }
}

static void parseConfigFiles(FFdata* data) {
    if (__builtin_expect(data->genConfigPath.length == 0, true)) {
        FF_LIST_FOR_EACH (FFstrbuf, dir, instance.state.platform.configDirs) {
            uint32_t dirLength = dir->length;

            ffStrbufAppendS(dir, "fastfetch/config.jsonc");
            bool success = parseJsoncFile(data, dir->chars, YYJSON_READ_ALLOW_COMMENTS | YYJSON_READ_ALLOW_TRAILING_COMMAS);
            ffStrbufSubstrBefore(dir, dirLength);
            if (success) {
                return;
            }

            ffStrbufAppendS(dir, "fastfetch/config.json5");
            success = parseJsoncFile(data, dir->chars, YYJSON_READ_JSON5);
            ffStrbufSubstrBefore(dir, dirLength);
            if (success) {
                return;
            }
        }
    }
}

static void parseArguments(FFdata* data, int argc, char** argv, void (*parser)(FFdata* data, char* key, char* value)) {
    for (int i = 1; i < argc; i++) {
        const char* key = argv[i];
        if (*key == '\0') {
            continue; // has been handled by parseCommand
        }

        if (*key != '-') {
            fprintf(stderr, "Error: invalid option: %s. An option must start with `-`\n", key);
            exit(400);
        }

        if (i == argc - 1 || (argv[i + 1][0] == '-' && argv[i + 1][1] != '\0' &&    // `-` is used as an alias for `/dev/stdin`
                                 !ffStrEqualsIgnCase(argv[i], "--separator-string") // Separator string can start with a -
                                 )) {
            parser(data, argv[i], NULL);
        } else {
            parser(data, argv[i], argv[i + 1]);
            ++i;
        }
    }
}

static void run(FFdata* data) {
    const bool useJsonConfig = data->structure.length == 0 && data->configDoc;

    if (useJsonConfig) {
        ffPrintJsonConfig(data, true /* prepare */);
    } else {
        // If we don't have a custom structure, use the default one
        if (data->structure.length == 0) {
            ffStrbufAppendS(&data->structure, FASTFETCH_DATATEXT_STRUCTURE); // Cannot use `ffStrbufSetStatic` here because we will modify the string
        }
        ffPrepareCommandOption(data);
    }

    ffStart();

    if (!data->resultDoc) {
        ffLogoPrint();
    }

#if defined(_WIN32)
    if (!instance.config.display.noBuffer) {
        fflush(stdout);
    }
#endif

    while (true) {
        if (useJsonConfig) {
            ffPrintJsonConfig(data, false);
        } else {
            ffPrintCommandOption(data);
        }

        if (instance.state.dynamicInterval > 0) {
            fflush(stdout);
            ffTimeSleep(instance.state.dynamicInterval);
            fputs("\e[H", stdout);
        } else {
            break;
        }

        if (useJsonConfig) {
            ffPrintJsonConfig(data, true /* prepare */);
        } else {
            ffPrepareCommandOption(data);
        }
    }

    if (data->resultDoc) {
        yyjson_mut_write_fp(stdout, data->resultDoc, YYJSON_WRITE_INF_AND_NAN_AS_NULL | YYJSON_WRITE_PRETTY_TWO_SPACES | YYJSON_WRITE_NEWLINE_AT_END, NULL, NULL);
    } else {
        if (instance.config.logo.printRemaining) {
            ffLogoPrintRemaining();
        }
        ffFinish();
    }
}

static void writeConfigFile(FFdata* data) {
    const FFstrbuf* filename = &data->genConfigPath;

    yyjson_mut_doc* doc = data->resultDoc;
    yyjson_mut_val* root = yyjson_mut_obj(doc);
    yyjson_mut_doc_set_root(doc, root);
    yyjson_mut_obj_add_str(doc, root, "$schema", "https://github.com/fastfetch-cli/fastfetch/raw/master/doc/json_schema.json");

    if (data->docType == FF_RESULT_DOC_TYPE_CONFIG_FULL) {
        ffOptionsGenerateLogoJsonConfig(data, &instance.config.logo);
        ffOptionsGenerateDisplayJsonConfig(data, &instance.config.display);
        ffOptionsGenerateGeneralJsonConfig(data, &instance.config.general);
    }
    ffMigrateCommandOptionToJsonc(data);

    if (ffStrbufEqualS(filename, "-")) {
        yyjson_mut_write_fp(stdout, doc, YYJSON_WRITE_INF_AND_NAN_AS_NULL | YYJSON_WRITE_PRETTY_TWO_SPACES | YYJSON_WRITE_NEWLINE_AT_END, NULL, NULL);
    } else {
        size_t len;
        FF_AUTO_FREE const char* str = yyjson_mut_write(doc, YYJSON_WRITE_INF_AND_NAN_AS_NULL | YYJSON_WRITE_PRETTY_TWO_SPACES | YYJSON_WRITE_NEWLINE_AT_END, &len);
        if (!str) {
            printf("Error: failed to generate config file\n");
            exit(1);
        }
        if (ffWriteFileData(filename->chars, len, str)) {
            printf("✓ Configuration file generated: `%s`\n"
                   "* Tip: Use a JSON schema-aware editor for better editing experience\n"
                   "* Documentation: https://github.com/fastfetch-cli/fastfetch/wiki/Configuration\n",
                filename->chars);
        } else {
            printf("Error: failed to write file in `%s`\n", filename->chars);
            exit(1);
        }
    }
}

int main(int argc, char** argv) {
    ffInitInstance();
    atexit(ffDestroyInstance);

    // Data stores things only needed for the configuration of fastfetch
    FFdata data = {
        .structure = ffStrbufCreate(),
        .structureDisabled = ffStrbufCreate(),
        .genConfigPath = ffStrbufCreate(),
    };

    parseArguments(&data, argc, argv, parseCommand);
    if (instance.state.dynamicInterval && data.resultDoc) {
        fprintf(stderr, "Error: --dynamic-interval cannot be used with --json\n");
        exit(400);
    }

    if (!data.configLoaded && !getenv("NO_CONFIG")) {
        parseConfigFiles(&data);
    }
    parseArguments(&data, argc, argv, (void*) parseOption);

    if (__builtin_expect(data.genConfigPath.length == 0, true)) {
        run(&data);
    } else {
        writeConfigFile(&data);
    }

    ffStrbufDestroy(&data.structure);
    ffStrbufDestroy(&data.structureDisabled);
    yyjson_doc_free(data.configDoc);
    yyjson_mut_doc_free(data.resultDoc);
    ffStrbufDestroy(&data.genConfigPath);
}
