#include "common/printing.h"
#include "common/jsonconfig.h"
#include "common/strutil.h"
#include "detection/dns/dns.h"
#include "modules/dns/dns.h"

bool ffPrintDNS(FFDNSOptions* options) {
    FF_LIST_AUTO_DESTROY result = ffListCreate();

    const char* error = ffDetectDNS(options, &result);

    if (error) {
        ffPrintError(FF_DNS_MODULE_NAME, 0, &options->moduleArgs, FF_PRINT_TYPE_DEFAULT, "%s", error);
        return false;
    }

    if (result.length == 0) {
        ffPrintError(FF_DNS_MODULE_NAME, 0, &options->moduleArgs, FF_PRINT_TYPE_DEFAULT, "NO DNS servers detected");
        return false;
    }

    FF_STRBUF_AUTO_DESTROY buf = ffStrbufCreate();
    FF_LIST_FOR_EACH (FFstrbuf, item, result) {
        if (!ffStrbufContainC(item, '.')) {
            continue; // IPv4
        }
        if (buf.length) {
            ffStrbufAppendC(&buf, ' ');
        }
        ffStrbufAppend(&buf, item);
    }
    FF_LIST_FOR_EACH (FFstrbuf, item, result) {
        if (!ffStrbufContainC(item, ':')) {
            continue; // IPv6
        }
        if (buf.length) {
            ffStrbufAppendC(&buf, ' ');
        }
        ffStrbufAppend(&buf, item);
    }

    if (options->moduleArgs.outputFormat.length == 0) {
        ffPrintLogoAndKey(FF_DNS_MODULE_NAME, 0, &options->moduleArgs, FF_PRINT_TYPE_DEFAULT);

        ffStrbufPutTo(&buf, stdout);
    } else {
        FF_PRINT_FORMAT_CHECKED(FF_DNS_MODULE_NAME, 0, &options->moduleArgs, FF_PRINT_TYPE_DEFAULT, ((FFformatarg[]) {
                                                                                                        FF_ARG(buf, "result"),
                                                                                                    }));
    }

    FF_LIST_FOR_EACH (FFstrbuf, item, result) {
        ffStrbufDestroy(item);
    }

    return true;
}

void ffParseDNSJsonObject(FFDNSOptions* options, yyjson_val* module) {
    yyjson_val *key, *val;
    size_t idx, max;
    yyjson_obj_foreach (module, idx, max, key, val) {
        if (ffJsonConfigParseModuleArgs(key, val, &options->moduleArgs)) {
            continue;
        }

        if (unsafe_yyjson_equals_str(key, "showType")) {
            int value;
            const char* error = ffJsonConfigParseEnum(val, &value, (FFKeyValuePair[]) {
                                                                       { "both", FF_DNS_TYPE_BOTH },
                                                                       { "ipv4", FF_DNS_TYPE_IPV4_BIT },
                                                                       { "ipv6", FF_DNS_TYPE_IPV6_BIT },
                                                                       {},
                                                                   });
            if (error) {
                ffPrintError(FF_DNS_MODULE_NAME, 0, nullptr, FF_PRINT_TYPE_NO_CUSTOM_KEY, "Invalid %s value: %s", unsafe_yyjson_get_str(key), error);
            } else {
                options->showType = (FFDNSShowType) value;
            }
            continue;
        }

        ffPrintError(FF_DNS_MODULE_NAME, 0, &options->moduleArgs, FF_PRINT_TYPE_DEFAULT, "Unknown JSON key %s", unsafe_yyjson_get_str(key));
    }
}

void ffGenerateDNSJsonConfig(FFDNSOptions* options, yyjson_mut_doc* doc, yyjson_mut_val* module) {
    ffJsonConfigGenerateModuleArgsConfig(doc, module, &options->moduleArgs);

    switch ((uint8_t) options->showType) {
        case FF_DNS_TYPE_IPV4_BIT:
            yyjson_mut_obj_add_str(doc, module, "showType", "ipv4");
            break;
        case FF_DNS_TYPE_IPV6_BIT:
            yyjson_mut_obj_add_str(doc, module, "showType", "ipv6");
            break;
        case FF_DNS_TYPE_BOTH:
            yyjson_mut_obj_add_str(doc, module, "showType", "both");
            break;
    }
}

bool ffGenerateDNSJsonResult(FFDNSOptions* options, yyjson_mut_doc* doc, yyjson_mut_val* module) {
    FF_LIST_AUTO_DESTROY result = ffListCreate();

    const char* error = ffDetectDNS(options, &result);

    if (error) {
        yyjson_mut_obj_add_str(doc, module, "error", error);
        return false;
    }

    yyjson_mut_val* arr = yyjson_mut_obj_add_arr(doc, module, "result");

    FF_LIST_FOR_EACH (FFstrbuf, item, result) {
        yyjson_mut_arr_add_strbuf(doc, arr, item);
    }

    FF_LIST_FOR_EACH (FFstrbuf, item, result) {
        ffStrbufDestroy(item);
    }

    return true;
}

void ffInitDNSOptions(FFDNSOptions* options) {
    ffOptionInitModuleArg(&options->moduleArgs, "󰇖");

    options->showType = FF_DNS_TYPE_BOTH;
}

void ffDestroyDNSOptions(FFDNSOptions* options) {
    ffOptionDestroyModuleArg(&options->moduleArgs);
}

FFModuleBaseInfo ffDNSModuleInfo = {
    .name = FF_DNS_MODULE_NAME,
    .description = "Print configured DNS servers",
    .initOptions = (void*) ffInitDNSOptions,
    .destroyOptions = (void*) ffDestroyDNSOptions,
    .parseJsonObject = (void*) ffParseDNSJsonObject,
    .printModule = (void*) ffPrintDNS,
    .generateJsonResult = (void*) ffGenerateDNSJsonResult,
    .generateJsonConfig = (void*) ffGenerateDNSJsonConfig,
    .formatArgs = FF_FORMAT_ARG_LIST(((FFModuleFormatArg[]) {
        { "DNS result", "result" },
    })),
    .defaultOrder = 50,
};
