#include "common/printing.h"
#include "common/jsonconfig.h"
#include "common/option.h"
#include "detection/os/os.h"
#include "modules/os/os.h"
#include "util/stringUtils.h"

#include <ctype.h>

#define FF_OS_NUM_FORMAT_ARGS 12

static void buildOutputDefault(const FFOSResult* os, FFstrbuf* result)
{
    //Create the basic output
    if(os->name.length > 0)
        ffStrbufAppend(result, &os->name);
    else if(os->prettyName.length > 0)
        ffStrbufAppend(result, &os->prettyName);
    else if(os->id.length > 0)
        ffStrbufAppend(result, &os->id);
    else
        ffStrbufAppend(result, &instance.state.platform.sysinfo.name);

    //Append code name if it is missing
    if(os->codename.length > 0 && !ffStrbufContainIgnCase(result, &os->codename))
    {
        ffStrbufAppendC(result, ' ');
        ffStrbufAppend(result, &os->codename);
    }

    //Append version if it is missing
    if(os->versionID.length > 0 && !ffStrbufContainIgnCase(result, &os->versionID))
    {
        ffStrbufAppendC(result, ' ');
        ffStrbufAppend(result, &os->versionID);
    }
    else if(os->versionID.length == 0 && os->version.length > 0 && !ffStrbufContainIgnCase(result, &os->version))
    {
        ffStrbufAppendC(result, ' ');
        ffStrbufAppend(result, &os->version);
    }

    //Append variant if it is missing
    if(os->variant.length > 0 && !ffStrbufContainIgnCase(result, &os->variant))
    {
        ffStrbufAppendS(result, " (");
        ffStrbufAppend(result, &os->variant);
        ffStrbufAppendC(result, ')');
    }
    else if(os->variant.length == 0 && os->variantID.length > 0 && !ffStrbufContainIgnCase(result, &os->variantID))
    {
        ffStrbufAppendS(result, " (");
        ffStrbufAppend(result, &os->variantID);
        ffStrbufAppendC(result, ')');
    }

    //Append architecture if it is missing
    if(!ffStrbufContainIgnCase(result, &instance.state.platform.sysinfo.architecture))
    {
        ffStrbufAppendC(result, ' ');
        ffStrbufAppend(result, &instance.state.platform.sysinfo.architecture);
    }
}

static void buildOutputNixOS(const FFOSResult* os, FFstrbuf* result)
{
    ffStrbufAppendS(result, "NixOS");

    if(os->buildID.length > 0)
    {
        ffStrbufAppendC(result, ' ');
        ffStrbufAppend(result, &os->buildID);
    }

    if(os->codename.length > 0)
    {
        ffStrbufAppendS(result, " (");
        ffStrbufAppendC(result, (char) toupper(os->codename.chars[0]));
        ffStrbufAppendS(result, os->codename.chars + 1);
        ffStrbufAppendC(result, ')');
    }

    if(instance.state.platform.sysinfo.architecture.length > 0)
    {
        ffStrbufAppendC(result, ' ');
        ffStrbufAppend(result, &instance.state.platform.sysinfo.architecture);
    }
}

void ffPrintOS(FFOSOptions* options)
{
    const FFOSResult* os = ffDetectOS();

    if(os->name.length == 0 && os->prettyName.length == 0 && os->id.length == 0)
    {
        ffPrintError(FF_OS_MODULE_NAME, 0, &options->moduleArgs, FF_PRINT_TYPE_DEFAULT, "Could not detect OS");
        return;
    }

    if(options->moduleArgs.outputFormat.length == 0)
    {
        FF_STRBUF_AUTO_DESTROY result = ffStrbufCreate();

        if(ffStrbufIgnCaseCompS(&os->id, "nixos") == 0)
            buildOutputNixOS(os, &result);
        else
            buildOutputDefault(os, &result);

        ffPrintLogoAndKey(FF_OS_MODULE_NAME, 0, &options->moduleArgs, FF_PRINT_TYPE_DEFAULT);
        ffStrbufPutTo(&result, stdout);
    }
    else
    {
        FF_PRINT_FORMAT_CHECKED(FF_OS_MODULE_NAME, 0, &options->moduleArgs, FF_PRINT_TYPE_DEFAULT, FF_OS_NUM_FORMAT_ARGS, ((FFformatarg[]){
            {FF_FORMAT_ARG_TYPE_STRBUF, &instance.state.platform.sysinfo.name, "sysname"},
            {FF_FORMAT_ARG_TYPE_STRBUF, &os->name, "name"},
            {FF_FORMAT_ARG_TYPE_STRBUF, &os->prettyName, "pretty-name"},
            {FF_FORMAT_ARG_TYPE_STRBUF, &os->id, "id"},
            {FF_FORMAT_ARG_TYPE_STRBUF, &os->idLike, "id-like"},
            {FF_FORMAT_ARG_TYPE_STRBUF, &os->variant, "variant"},
            {FF_FORMAT_ARG_TYPE_STRBUF, &os->variantID, "variant-id"},
            {FF_FORMAT_ARG_TYPE_STRBUF, &os->version, "version"},
            {FF_FORMAT_ARG_TYPE_STRBUF, &os->versionID, "version-id"},
            {FF_FORMAT_ARG_TYPE_STRBUF, &os->codename, "codename"},
            {FF_FORMAT_ARG_TYPE_STRBUF, &os->buildID, "build-id"},
            {FF_FORMAT_ARG_TYPE_STRBUF, &instance.state.platform.sysinfo.architecture, "arch"}
        }));
    }
}

bool ffParseOSCommandOptions(FFOSOptions* options, const char* key, const char* value)
{
    const char* subKey = ffOptionTestPrefix(key, FF_OS_MODULE_NAME);
    if (!subKey) return false;
    if (ffOptionParseModuleArgs(key, subKey, value, &options->moduleArgs))
        return true;

    return false;
}

void ffParseOSJsonObject(FFOSOptions* options, yyjson_val* module)
{
    yyjson_val *key_, *val;
    size_t idx, max;
    yyjson_obj_foreach(module, idx, max, key_, val)
    {
        const char* key = yyjson_get_str(key_);
        if(ffStrEqualsIgnCase(key, "type"))
            continue;

        if (ffJsonConfigParseModuleArgs(key, val, &options->moduleArgs))
            continue;

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

void ffGenerateOSJsonConfig(FFOSOptions* options, yyjson_mut_doc* doc, yyjson_mut_val* module)
{
    __attribute__((__cleanup__(ffDestroyOSOptions))) FFOSOptions defaultOptions;
    ffInitOSOptions(&defaultOptions);

    ffJsonConfigGenerateModuleArgsConfig(doc, module, &defaultOptions.moduleArgs, &options->moduleArgs);
}

void ffGenerateOSJsonResult(FF_MAYBE_UNUSED FFOSOptions* options, yyjson_mut_doc* doc, yyjson_mut_val* module)
{
    const FFOSResult* os = ffDetectOS();

    if(os->name.length == 0 && os->prettyName.length == 0 && os->id.length == 0)
    {
        yyjson_mut_obj_add_str(doc, module, "error", "Could not detect OS");
        return;
    }

    yyjson_mut_val* obj = yyjson_mut_obj_add_obj(doc, module, "result");
    yyjson_mut_obj_add_strbuf(doc, obj, "buildID", &os->buildID);
    yyjson_mut_obj_add_strbuf(doc, obj, "codename", &os->codename);
    yyjson_mut_obj_add_strbuf(doc, obj, "id", &os->id);
    yyjson_mut_obj_add_strbuf(doc, obj, "idLike", &os->idLike);
    yyjson_mut_obj_add_strbuf(doc, obj, "name", &os->name);
    yyjson_mut_obj_add_strbuf(doc, obj, "prettyName", &os->prettyName);
    yyjson_mut_obj_add_strbuf(doc, obj, "variant", &os->variant);
    yyjson_mut_obj_add_strbuf(doc, obj, "variantID", &os->variantID);
    yyjson_mut_obj_add_strbuf(doc, obj, "version", &os->version);
    yyjson_mut_obj_add_strbuf(doc, obj, "versionID", &os->versionID);
}

void ffPrintOSHelpFormat(void)
{
    FF_PRINT_MODULE_FORMAT_HELP_CHECKED(FF_OS_MODULE_NAME, "{3} {10} {12}", FF_OS_NUM_FORMAT_ARGS, ((const char* []) {
        "Name of the kernel (Linux, WIN32_NT, Darwin, FreeBSD) - sysname",
        "Name of the OS - name",
        "Pretty name of the OS - pretty-name",
        "ID of the OS - id",
        "ID like of the OS - id-like",
        "Variant of the OS - variant",
        "Variant ID of the OS - variant-id",
        "Version of the OS - version",
        "Version ID of the OS - version-id",
        "Version codename of the OS - codename",
        "Build ID of the OS - build-id",
        "Architecture of the OS - arch",
    }));
}

void ffInitOSOptions(FFOSOptions* options)
{
    ffOptionInitModuleBaseInfo(
        &options->moduleInfo,
        FF_OS_MODULE_NAME,
        "Print operating system name and version",
        ffParseOSCommandOptions,
        ffParseOSJsonObject,
        ffPrintOS,
        ffGenerateOSJsonResult,
        ffPrintOSHelpFormat,
        ffGenerateOSJsonConfig
    );
    ffOptionInitModuleArg(&options->moduleArgs,
        #ifdef _WIN32
            ""
        #elif __APPLE__
            ""
        #elif __FreeBSD__
            "󰣠"
        #elif __linux__
            ""
        #elif __ANDROID__
            ""
        #elif __sun
            ""
        #else
            "?"
        #endif
    );
}

void ffDestroyOSOptions(FFOSOptions* options)
{
    ffOptionDestroyModuleArg(&options->moduleArgs);
}
