#if _WIN32
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN 1
#endif
#ifndef NOMINMAX
#define NOMINMAX
#endif
#include <windows.h>
#include <io.h>
#else
#include <sys/ioctl.h>
#include <unistd.h>
#endif

#include <fcntl.h>
#include <chrono>
#include <mutex>
#include <thread>
#include <unordered_map>
#include <stdio.h>
#include <inttypes.h>
#include <signal.h>
#include "logvisor/logvisor.hpp"

/* ANSI sequences */
#define RED "\x1b[1;31m"
#define YELLOW "\x1b[1;33m"
#define GREEN "\x1b[1;32m"
#define MAGENTA "\x1b[1;35m"
#define CYAN "\x1b[1;36m"
#define BOLD "\x1b[1m"
#define NORMAL "\x1b[0m"

#if _WIN32
#define FOREGROUND_WHITE FOREGROUND_RED|FOREGROUND_GREEN|FOREGROUND_BLUE
#endif

void logvisorBp() {}

namespace logvisor
{
static Module Log("logvisor");

static std::unordered_map<std::thread::id, const char*> ThreadMap;
void RegisterThreadName(const char* name)
{
    ThreadMap[std::this_thread::get_id()] = name;
#if __APPLE__
    pthread_setname_np(name);
#elif __linux__
    pthread_setname_np(pthread_self(), name);
#elif _MSC_VER
    struct
    {
        DWORD dwType; // Must be 0x1000.
        LPCSTR szName; // Pointer to name (in user addr space).
        DWORD dwThreadID; // Thread ID (-1=caller thread).
        DWORD dwFlags; // Reserved for future use, must be zero.
    } info = {0x1000, name, (DWORD)-1, 0};
    __try
    {
        RaiseException(0x406D1388, 0, sizeof(info)/sizeof(ULONG_PTR), (ULONG_PTR*)&info);
    }
    __except(EXCEPTION_EXECUTE_HANDLER)
    {
    }
#endif
}

#if _WIN32
#include <DbgHelp.h>
#pragma comment(lib, "Dbghelp.lib")

static void logvisorAbort()
{
    unsigned int i;
    void* stack[100];
    unsigned short frames;
    SYMBOL_INFO* symbol;
    HANDLE process;

    process = GetCurrentProcess();
    SymInitialize(process, NULL, TRUE);
    frames = CaptureStackBackTrace(0, 100, stack, NULL);
    symbol = (SYMBOL_INFO*)calloc(sizeof(SYMBOL_INFO) + 256 * sizeof(char), 1);
    symbol->MaxNameLen = 255;
    symbol->SizeOfStruct = sizeof(SYMBOL_INFO);

    for (i = 0; i < frames; i++)
    {
        SymFromAddr(process, (DWORD64)(stack[i]), 0, symbol);

        printf("%i: %s - 0x%0llX", frames - i - 1, symbol->Name, symbol->Address);

        DWORD dwDisplacement;
        IMAGEHLP_LINE64 line;
        SymSetOptions(SYMOPT_LOAD_LINES);

        line.SizeOfStruct = sizeof(IMAGEHLP_LINE64);
        if (SymGetLineFromAddr64(process, (DWORD64)(stack[i]), &dwDisplacement, &line))
        {
            // SymGetLineFromAddr64 returned success
            printf(" LINE %d\n", line.LineNumber);
        }
        else
        {
            printf("\n");
        }
    }

    free(symbol);

    // If you caught one of the above signals, it is likely you just
    // want to quit your program right now.
    abort();
}
#else

#include <execinfo.h>
void logvisorAbort()
{
    void* array[128];
    size_t size = backtrace(array, 128);
    char** strings = backtrace_symbols(array, size);

    for (size_t i = 0; i < size; i++)
       printf("%s\n", strings[i]);

    free(strings);
    abort();
}

#endif

static void AbortHandler(int signum)
{
    switch (signum)
    {
    case SIGSEGV:
        Log.report(logvisor::Fatal, "Segmentation Fault");
    case SIGILL:
        Log.report(logvisor::Fatal, "Bad Execution");
    case SIGFPE:
        Log.report(logvisor::Fatal, "Floating Point Exception");
    default:
        Log.report(logvisor::Fatal, "unknown signal %d", signum);
    }
}

std::vector<std::unique_ptr<ILogger>> MainLoggers;
std::atomic_size_t ErrorCount(0);
static std::chrono::steady_clock MonoClock;
static std::chrono::steady_clock::time_point GlobalStart = MonoClock.now();
static inline std::chrono::steady_clock::duration CurrentUptime()
{return MonoClock.now() - GlobalStart;}
std::atomic_uint_fast64_t FrameIndex(0);
std::mutex LogMutex;

static inline int ConsoleWidth()
{
    int retval = 80;
#if _WIN32
    CONSOLE_SCREEN_BUFFER_INFO info;
    GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &info);
    retval = info.dwSize.X - 1;
#else
    struct winsize w;
    if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &w) != -1)
        retval = w.ws_col;
#endif
    if (retval < 10)
        return 10;
    return retval;
}

#if _WIN32
static HANDLE Term = 0;
#else
static const char* Term = nullptr;
#endif
bool XtermColor = false;
struct ConsoleLogger : public ILogger
{
    std::mutex m;
    ConsoleLogger()
    {
#if _WIN32
        const char* conemuANSI = getenv("ConEmuANSI");
        if (conemuANSI && !strcmp(conemuANSI, "ON"))
            XtermColor = true;
        if (!Term)
            Term = GetStdHandle(STD_ERROR_HANDLE);
#else
        if (!Term)
        {
            Term = getenv("TERM");
            if (Term && !strncmp(Term, "xterm", 5))
            {
                XtermColor = true;
                putenv((char*)"TERM=xterm-16color");
            }
        }
#endif
    }

    static void _reportHead(const char* modName, const char* sourceInfo, Level severity)
    {
        /* Clear current line out */
        int width = ConsoleWidth();
        fprintf(stderr, "\r");
        for (int w=0 ; w<width ; ++w)
            fprintf(stderr, " ");
        fprintf(stderr, "\r");

        std::chrono::steady_clock::duration tm = CurrentUptime();
        double tmd = tm.count() *
            std::chrono::steady_clock::duration::period::num /
            (double)std::chrono::steady_clock::duration::period::den;
        std::thread::id thrId = std::this_thread::get_id();
        const char* thrName = nullptr;
        if (ThreadMap.find(thrId) != ThreadMap.end())
            thrName = ThreadMap[thrId];

        if (XtermColor)
        {
            fprintf(stderr, BOLD "[");
            fprintf(stderr, GREEN "%5.4f ", tmd);
            uint_fast64_t fIdx = FrameIndex.load();
            if (fIdx)
                fprintf(stderr, "(%" PRIu64 ") ", fIdx);
            switch (severity)
            {
                case Info:
                    fprintf(stderr, BOLD CYAN "INFO");
                    break;
                case Warning:
                    fprintf(stderr, BOLD YELLOW "WARNING");
                    break;
                case Error:
                    fprintf(stderr, RED BOLD "ERROR");
                    break;
                case Fatal:
                    fprintf(stderr, BOLD RED "FATAL ERROR");
                    break;
                default:
                    break;
            };
            fprintf(stderr, NORMAL BOLD " %s", modName);
            if (sourceInfo)
                fprintf(stderr, BOLD YELLOW " {%s}", sourceInfo);
            if (thrName)
                fprintf(stderr, BOLD MAGENTA " (%s)", thrName);
            fprintf(stderr, NORMAL BOLD "] " NORMAL);
        }
        else
        {
#if _WIN32
            SetConsoleTextAttribute(Term, FOREGROUND_INTENSITY | FOREGROUND_WHITE);
            fprintf(stderr, "[");
            SetConsoleTextAttribute(Term, FOREGROUND_INTENSITY | FOREGROUND_GREEN);
            fprintf(stderr, "%5.4f ", tmd);
            uint64_t fi = FrameIndex.load();
            if (fi)
                fprintf(stderr, "(%" PRIu64 ") ", fi);
            switch (severity)
            {
            case Info:
                SetConsoleTextAttribute(Term, FOREGROUND_INTENSITY | FOREGROUND_GREEN | FOREGROUND_BLUE);
                fprintf(stderr, "INFO");
                break;
            case Warning:
                SetConsoleTextAttribute(Term, FOREGROUND_INTENSITY | FOREGROUND_RED | FOREGROUND_GREEN);
                fprintf(stderr, "WARNING");
                break;
            case Error:
                SetConsoleTextAttribute(Term, FOREGROUND_INTENSITY | FOREGROUND_RED);
                fprintf(stderr, "ERROR");
                break;
            case Fatal:
                SetConsoleTextAttribute(Term, FOREGROUND_INTENSITY | FOREGROUND_RED);
                fprintf(stderr, "FATAL ERROR");
                break;
            default:
                break;
            };
            SetConsoleTextAttribute(Term, FOREGROUND_INTENSITY | FOREGROUND_WHITE);
            fprintf(stderr, " %s", modName);
            SetConsoleTextAttribute(Term, FOREGROUND_INTENSITY | FOREGROUND_RED | FOREGROUND_GREEN);
            if (sourceInfo)
                fprintf(stderr, " {%s}", sourceInfo);
            SetConsoleTextAttribute(Term, FOREGROUND_INTENSITY | FOREGROUND_RED | FOREGROUND_BLUE);
            if (thrName)
                fprintf(stderr, " (%s)", thrName);
            SetConsoleTextAttribute(Term, FOREGROUND_INTENSITY | FOREGROUND_WHITE);
            fprintf(stderr, "] ");
            SetConsoleTextAttribute(Term, FOREGROUND_WHITE);
#else
            fprintf(stderr, "[");
            fprintf(stderr, "%5.4f ", tmd);
            uint_fast64_t fIdx = FrameIndex.load();
            if (fIdx)
                fprintf(stderr, "(%" PRIu64 ") ", fIdx);
            switch (severity)
            {
            case Info:
                fprintf(stderr, "INFO");
                break;
            case Warning:
                fprintf(stderr, "WARNING");
                break;
            case Error:
                fprintf(stderr, "ERROR");
                break;
            case Fatal:
                fprintf(stderr, "FATAL ERROR");
                break;
            default:
                break;
            };
            fprintf(stderr, " %s", modName);
            if (sourceInfo)
                fprintf(stderr, " {%s}", sourceInfo);
            if (thrName)
                fprintf(stderr, " (%s)", thrName);
            fprintf(stderr, "] ");
#endif
        }
    }

    void report(const char* modName, Level severity,
                const char* format, va_list ap)
    {
        std::unique_lock<std::mutex> lk(m);
        _reportHead(modName, nullptr, severity);
        vfprintf(stderr, format, ap);
        fprintf(stderr, "\n");
    }

    void report(const char* modName, Level severity,
                const wchar_t* format, va_list ap)
    {
        std::unique_lock<std::mutex> lk(m);
        _reportHead(modName, nullptr, severity);
        vfwprintf(stderr, format, ap);
        fprintf(stderr, "\n");
    }

    void reportSource(const char* modName, Level severity,
                      const char* file, unsigned linenum,
                      const char* format, va_list ap)
    {
        std::unique_lock<std::mutex> lk(m);
        char sourceInfo[128];
        snprintf(sourceInfo, 128, "%s:%u", file, linenum);
        _reportHead(modName, sourceInfo, severity);
        vfprintf(stderr, format, ap);
        fprintf(stderr, "\n");
    }

    void reportSource(const char* modName, Level severity,
                      const char* file, unsigned linenum,
                      const wchar_t* format, va_list ap)
    {
        std::unique_lock<std::mutex> lk(m);
        char sourceInfo[128];
        snprintf(sourceInfo, 128, "%s:%u", file, linenum);
        _reportHead(modName, sourceInfo, severity);
        vfwprintf(stderr, format, ap);
        fprintf(stderr, "\n");
    }
};

void RegisterConsoleLogger()
{
    /* Determine if console logger already added */
    for (auto& logger : MainLoggers)
    {
        if (typeid(logger.get()) == typeid(ConsoleLogger))
            return;
    }

    /* Otherwise construct new console logger */
    MainLoggers.emplace_back(new ConsoleLogger);
}

#if _WIN32
void CreateWin32Console()
{
    /* Debug console */
    AllocConsole();

    freopen("CONIN$", "r", stdin);
    freopen("CONOUT$", "w", stdout);
    freopen("CONOUT$", "w", stderr);
}
#endif

void RegisterStandardExceptions()
{
    signal(SIGSEGV, AbortHandler);
    signal(SIGILL, AbortHandler);
    signal(SIGFPE, AbortHandler);
}

struct FileLogger : public ILogger
{
    FILE* fp;
    std::mutex m;
    virtual void openFile()=0;
    virtual void closeFile() {fclose(fp);}

    void _reportHead(const char* modName, const char* sourceInfo, Level severity)
    {
        std::chrono::steady_clock::duration tm = CurrentUptime();
        double tmd = tm.count() *
            std::chrono::steady_clock::duration::period::num /
            (double)std::chrono::steady_clock::duration::period::den;
        std::thread::id thrId = std::this_thread::get_id();
        const char* thrName = nullptr;
        if (ThreadMap.find(thrId) != ThreadMap.end())
            thrName = ThreadMap[thrId];

        fprintf(fp, "[");
        fprintf(fp, "%5.4f ", tmd);
        uint_fast64_t fIdx = FrameIndex.load();
        if (fIdx)
            fprintf(fp, "(%" PRIu64 ") ", fIdx);
        switch (severity)
        {
        case Info:
            fprintf(fp, "INFO");
            break;
        case Warning:
            fprintf(fp, "WARNING");
            break;
        case Error:
            fprintf(fp, "ERROR");
            break;
        case Fatal:
            fprintf(fp, "FATAL ERROR");
            break;
        default:
            break;
        };
        fprintf(fp, " %s", modName);
        if (sourceInfo)
            fprintf(fp, " {%s}", sourceInfo);
        if (thrName)
            fprintf(fp, " (%s)", thrName);
        fprintf(fp, "] ");
    }

    void report(const char* modName, Level severity,
                const char* format, va_list ap)
    {
        std::unique_lock<std::mutex> lk(m);
        openFile();
        _reportHead(modName, nullptr, severity);
        vfprintf(fp, format, ap);
        fprintf(fp, "\n");
        closeFile();
    }

    void report(const char* modName, Level severity,
                const wchar_t* format, va_list ap)
    {
        std::unique_lock<std::mutex> lk(m);
        openFile();
        _reportHead(modName, nullptr, severity);
        vfwprintf(fp, format, ap);
        fprintf(fp, "\n");
        closeFile();
    }

    void reportSource(const char* modName, Level severity,
                      const char* file, unsigned linenum,
                      const char* format, va_list ap)
    {
        std::unique_lock<std::mutex> lk(m);
        openFile();
        char sourceInfo[128];
        snprintf(sourceInfo, 128, "%s:%u", file, linenum);
        _reportHead(modName, sourceInfo, severity);
        vfprintf(fp, format, ap);
        fprintf(fp, "\n");
        closeFile();
    }

    void reportSource(const char* modName, Level severity,
                      const char* file, unsigned linenum,
                      const wchar_t* format, va_list ap)
    {
        std::unique_lock<std::mutex> lk(m);
        openFile();
        char sourceInfo[128];
        snprintf(sourceInfo, 128, "%s:%u", file, linenum);
        _reportHead(modName, sourceInfo, severity);
        vfwprintf(fp, format, ap);
        fprintf(fp, "\n");
        closeFile();
    }
};

struct FileLogger8 : public FileLogger
{
    const char* m_filepath;
    FileLogger8(const char* filepath) : m_filepath(filepath) {}
    void openFile() {fp = fopen(m_filepath, "a");}
};

void RegisterFileLogger(const char* filepath)
{
    /* Determine if file logger already added */
    for (auto& logger : MainLoggers)
    {
        FileLogger8* filelogger = dynamic_cast<FileLogger8*>(logger.get());
        if (filelogger)
        {
            if (!strcmp(filepath, filelogger->m_filepath))
                return;
        }
    }

    /* Otherwise construct new file logger */
    MainLoggers.emplace_back(new FileLogger8(filepath));
}

#if LOG_UCS2

struct FileLogger16 : public FileLogger
{
    const wchar_t* m_filepath;
    FileLogger16(const wchar_t* filepath) : m_filepath(filepath) {}
    void openFile() {fp = _wfopen(m_filepath, L"a");}
};

void RegisterFileLogger(const wchar_t* filepath)
{
    /* Determine if file logger already added */
    for (auto& logger : MainLoggers)
    {
        FileLogger16* filelogger = dynamic_cast<FileLogger16*>(logger.get());
        if (filelogger)
        {
            if (!wcscmp(filepath, filelogger->m_filepath))
                return;
        }
    }

    /* Otherwise construct new file logger */
    MainLoggers.emplace_back(new FileLogger16(filepath));
}

#endif

}