/* Copyright 2020 Jaakko Keränen <jaakko.keranen@iki.fi>

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this
   list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */

#include "indicatorwidget.h"
#include "paint.h"
#include "util.h"
#include "app.h"
#include "command.h"

#include <SDL_timer.h>

static int timerId_;   /* common timer for all indicators */
static int animCount_; /* number of animating indicators */

static uint32_t postRefresh_(uint32_t interval, void *context) {
    iUnused(context);
    postRefresh_App();
    return interval;
}

static void startTimer_(void) {
    animCount_++;
    if (!timerId_) {
        timerId_ = SDL_AddTimer(1000 / 60, postRefresh_, NULL);
    }
}

static void stopTimer_(void) {
    iAssert(animCount_ > 0);
    if (--animCount_ == 0) {
        iAssert(timerId_);
        SDL_RemoveTimer(timerId_);
        timerId_ = 0;
    }
}

struct Impl_IndicatorWidget{
    iWidget widget;
    iAnim   pos;
};

iDefineObjectConstruction(IndicatorWidget)

iLocalDef iBool isActive_IndicatorWidget_(const iIndicatorWidget *d) {
    return isSelected_Widget(d);
}

static void setActive_IndicatorWidget_(iIndicatorWidget *d, iBool set) {
    setFlags_Widget(as_Widget(d), selected_WidgetFlag, set);
}

void init_IndicatorWidget(iIndicatorWidget *d) {
    iWidget *w = &d->widget;
    init_Widget(w);
    init_Anim(&d->pos, 0);
    setFlags_Widget(w, unhittable_WidgetFlag, iTrue);
}

static void startTimer_IndicatorWidget_(iIndicatorWidget *d) {
    if (!isActive_IndicatorWidget_(d)) {
        startTimer_();
        setActive_IndicatorWidget_(d, iTrue);
    }
}

static void stopTimer_IndicatorWidget_(iIndicatorWidget *d) {
    if (isActive_IndicatorWidget_(d)) {
        stopTimer_();
        setActive_IndicatorWidget_(d, iFalse);
    }
}

void deinit_IndicatorWidget(iIndicatorWidget *d) {
    stopTimer_IndicatorWidget_(d);
}

static iBool isCompleted_IndicatorWidget_(const iIndicatorWidget *d) {
    return targetValue_Anim(&d->pos) == 1.0f;
}

void draw_IndicatorWidget_(const iIndicatorWidget *d) {
    const float pos = value_Anim(&d->pos);
    if (pos > 0.0f && pos < 1.0f) {
        const iWidget *w = &d->widget;
        const iRect rect = innerBounds_Widget(w);
        iPaint p;
        init_Paint(&p);
        int colors[2] = { uiTextCaution_ColorId, uiTextAction_ColorId };
        if (isLight_ColorTheme(colorTheme_App())) {
            colors[0] = black_ColorId;
        }
        fillRect_Paint(&p,
                       (iRect){ topLeft_Rect(rect), init_I2(pos * width_Rect(rect), gap_UI / 4)},
                       colors[isCompleted_IndicatorWidget_(d) ? 1 : 0]);
    }
}

iBool processEvent_IndicatorWidget_(iIndicatorWidget *d, const SDL_Event *ev) {
    iWidget *w = &d->widget;
    if (ev->type == SDL_USEREVENT && ev->user.code == refresh_UserEventCode) {
        if (isFinished_Anim(&d->pos)) {
            stopTimer_IndicatorWidget_(d);
        }
    }
    else if (isCommand_SDLEvent(ev)) {
        const char *cmd = command_UserEvent(ev);
        if (startsWith_CStr(cmd, "document.request.")) {
            if (pointerLabel_Command(cmd, "doc") == parent_Widget(w)) {
                cmd += 17;
                if (equal_Command(cmd, "started")) {
                    setValue_Anim(&d->pos, 0, 0);
                    setValue_Anim(&d->pos, 0.75f, 4000);
                    setFlags_Anim(&d->pos, easeOut_AnimFlag, iTrue);
                    startTimer_IndicatorWidget_(d);
                }
                else if (equal_Command(cmd, "finished")) {
                    if (value_Anim(&d->pos) > 0.01f) {
                        setValue_Anim(&d->pos, 1.0f, 250);
                        setFlags_Anim(&d->pos, easeOut_AnimFlag, iFalse);
                        startTimer_IndicatorWidget_(d);
                    }
                    else {
                        setValue_Anim(&d->pos, 0, 0);
                        stopTimer_IndicatorWidget_(d);
                        refresh_Widget(d);
                    }
                }
                else if (equal_Command(cmd, "cancelled")) {
                    setValue_Anim(&d->pos, 0, 0);
                    stopTimer_IndicatorWidget_(d);
                    refresh_Widget(d);
                }
            }
        }
    }
    return iFalse;
}

iBeginDefineSubclass(IndicatorWidget, Widget)
    .draw         = (iAny *) draw_IndicatorWidget_,
    .processEvent = (iAny *) processEvent_IndicatorWidget_,
iEndDefineSubclass(IndicatorWidget)