/* 
 * Copyright (C) 2012 Daniel Richman
 * License: GNU GPL 3
 *
 * update.cxx: Automatically check for updates
 */

#include "dl_fldigi/update.h"

#include <stdexcept>
#include <map>
#include <string>

#include <FL/Fl.H>
#include <FL/fl_ask.H>

#include "config.h"
#include "debug.h"
#include "fl_digi.h"
#include "icons.h"

#include "jsoncpp.h"
#include "dl_fldigi/dl_fldigi.h"
#include "dl_fldigi/version.h"
#include "habitat/EZ.h"

using namespace std;

namespace dl_fldigi {
namespace update {

// Designed to be run once only
static UpdateThread thr;
static string update_text, update_url;

static void got_update(void *);

void check()
{
    thr.start(); // EZ::SimpleThread won't start more than once
}

void cleanup()
{
    try
    {
        thr.join();
    }
    catch (runtime_error &e)
    {
        // throws error if joined before started. Ignore.
    }
}

#ifdef __MINGW32__
#define PLATFORM "mingw32"
#endif

#ifdef __APPLE__
#define PLATFORM "macosx"
#endif

#ifdef __linux__
#define PLATFORM "linux"
#endif

#ifndef PLATFORM
#error "Couldn't work out what the platform should be for update checking :-("
#endif

void *UpdateThread::run()
{
    map<string,string> args;
    args["platform"] = PLATFORM;
    args["commit"] = dl_fldigi::git_commit;

    string url = "http://habhub.org/dl-fldigi-check";
    url.append(EZ::cURL::query_string(args, true));

    EZ::cURL curl;
    string response;

    try
    {
        response = curl.get(url);
    }
    catch (runtime_error &e)
    {
        Fl_AutoLock lock;
        LOG_WARN("Error in update check: %s", e.what());
        return NULL;
    }

    /* blocking download done, now get the lock: */
    Fl_AutoLock lock;

    if (response == "")
    {
        LOG_INFO("dl-fldigi is up to date");
        return NULL;
    }

    Json::Reader reader;
    Json::Value val;

    if (!reader.parse(response, val, false) ||
        !val.isObject() || !val.size() ||
        !val["text"].isString() || !val["url"].isString())
    {
        LOG_WARN("Error in update check: Bad JSON");
        return NULL;
    }

    update_text = val["text"].asString();
    update_url = val["url"].asString();

    // Strange bug causing empty dialog boxes and unresponse process
    // requires running got_update in the main thread, but whatever:
    Fl::awake(got_update, NULL);
    return NULL;
}

static void got_update(void *)
{
    cleanup();

    int c = fl_choice2("Test %s", "Close", "Open in browser", NULL,
                       update_text.c_str());
    if (c)
    {
        LOG_INFO("Opening %s in browser", update_url.c_str());
        // from fl_digi.h
        cb_mnuVisitURL(0, (void *) update_url.c_str());
    }
}

} /* namespace update */
} /* namespace dl_fldigi */