#include "fastfetch.h"
#include "common/printing.h"
#include "detection/os/os.h"

#include <ctype.h>

#define FF_OS_MODULE_NAME "OS"
#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, &os->systemName);

    #ifdef __APPLE__
    if(os->codename.length > 0)
    {
        ffStrbufAppendC(result, ' ');
        ffStrbufAppend(result, &os->codename);
    }
    #endif

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

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

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

    //Append architecture if it is missing
    if(ffStrbufFirstIndex(result, &os->architecture) == result->length)
    {
        ffStrbufAppendC(result, ' ');
        ffStrbufAppend(result, &os->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(os->architecture.length > 0)
    {
        ffStrbufAppendC(result, ' ');
        ffStrbufAppend(result, &os->architecture);
    }
}

void ffPrintOS(FFinstance* instance)
{
    const FFOSResult* os = ffDetectOS(instance);

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

    if(instance->config.os.outputFormat.length == 0)
    {
        FFstrbuf result;
        ffStrbufInit(&result);

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

        ffPrintLogoAndKey(instance, FF_OS_MODULE_NAME, 0, &instance->config.os.key);
        ffStrbufPutTo(&result, stdout);
        ffStrbufDestroy(&result);
    }
    else
    {
        ffPrintFormat(instance, FF_OS_MODULE_NAME, 0, &instance->config.os, FF_OS_NUM_FORMAT_ARGS, (FFformatarg[]){
            {FF_FORMAT_ARG_TYPE_STRBUF, &os->systemName},
            {FF_FORMAT_ARG_TYPE_STRBUF, &os->name},
            {FF_FORMAT_ARG_TYPE_STRBUF, &os->prettyName},
            {FF_FORMAT_ARG_TYPE_STRBUF, &os->id},
            {FF_FORMAT_ARG_TYPE_STRBUF, &os->idLike},
            {FF_FORMAT_ARG_TYPE_STRBUF, &os->variant},
            {FF_FORMAT_ARG_TYPE_STRBUF, &os->variantID},
            {FF_FORMAT_ARG_TYPE_STRBUF, &os->version},
            {FF_FORMAT_ARG_TYPE_STRBUF, &os->versionID},
            {FF_FORMAT_ARG_TYPE_STRBUF, &os->codename},
            {FF_FORMAT_ARG_TYPE_STRBUF, &os->buildID},
            {FF_FORMAT_ARG_TYPE_STRBUF, &os->architecture}
        });
    }
}