//
// Copyright (c) 2014-2015, THUNDERBEAST GAMES LLC All rights reserved
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//

#include <TurboBadger/tb_widgets.h>

using namespace tb;

#include "../Core/Timer.h"
#include "../Graphics/Graphics.h"
#include "../IO/Log.h"
#include "../Input/Input.h"
#include "../Input/InputEvents.h"

#include "UI.h"
#include "UIEvents.h"
#include "UIOffscreenView.h"

namespace Atomic
{

static inline MODIFIER_KEYS GetModifierKeys(int qualifiers, bool superKey)
{
    MODIFIER_KEYS code = TB_MODIFIER_NONE;
    if (qualifiers & QUAL_ALT)   code |= TB_ALT;
    if (qualifiers & QUAL_CTRL)  code |= TB_CTRL;
    if (qualifiers & QUAL_SHIFT) code |= TB_SHIFT;
    if (superKey)                code |= TB_SUPER;
    return code;
}


// @return Return the upper case of a ascii charcter. Only for shortcut handling.
static int toupr_ascii(int ascii)
{
    if (ascii >= 'a' && ascii <= 'z')
        return ascii + 'A' - 'a';
    return ascii;
}

UIOffscreenView* UI::FindOffscreenViewAtScreenPosition(const IntVector2& screenPos, IntVector2& viewPos)
{
    for (HashSet<UIOffscreenView*>::Iterator it = offscreenViews_.Begin(); it != offscreenViews_.End(); ++it)
    {
        UIOffscreenView* osView = *it;
        IntRect rect = osView->inputRect_;
        Camera* camera = osView->inputCamera_;
        Octree* octree = osView->inputOctree_;
        Drawable* drawable = osView->inputDrawable_;
        bool rectIsDefault = rect == IntRect::ZERO;

        if (!camera || !octree || !drawable || (!rectIsDefault && !rect.IsInside(screenPos)))
            continue;

        Vector2 normPos(screenPos.x_ - rect.left_, screenPos.y_ - rect.top_);
        normPos /= rectIsDefault ? Vector2(graphics_->GetWidth(), graphics_->GetHeight()) : Vector2(rect.Width(), rect.Height());

        Ray ray(camera->GetScreenRay(normPos.x_, normPos.y_));
        PODVector<RayQueryResult> queryResultVector;
        RayOctreeQuery query(queryResultVector, ray, RAY_TRIANGLE_UV, M_INFINITY, DRAWABLE_GEOMETRY, DEFAULT_VIEWMASK);

        octree->RaycastSingle(query);

        if (queryResultVector.Empty())
            continue;

        RayQueryResult& queryResult(queryResultVector.Front());

        if (queryResult.drawable_ != drawable)
            continue;

        Vector2& uv = queryResult.textureUV_;
        viewPos = IntVector2(uv.x_ * osView->GetWidth(), uv.y_ * osView->GetHeight());

        return osView;
    }

    return nullptr;
}

tb::TBWidget* UI::GetInternalWidgetAndProjectedPositionFor(const IntVector2& screenPos, IntVector2& viewPos)
{
    UIOffscreenView* osView = FindOffscreenViewAtScreenPosition(screenPos, viewPos);
    if (osView)
        return osView->GetInternalWidget();

    viewPos = screenPos;
    return rootWidget_;
}

void UI::HandleMouseButtonDown(StringHash eventType, VariantMap& eventData)
{
    if (inputDisabled_ || consoleVisible_)
        return;

    using namespace MouseButtonDown;
    unsigned button = eventData[P_BUTTON].GetUInt();

    IntVector2 pos;
    pos = GetSubsystem<Input>()->GetMousePosition();

    Input* input = GetSubsystem<Input>();
    int qualifiers = input->GetQualifiers();

#ifdef ATOMIC_PLATFORM_WINDOWS
    bool superdown = input->GetKeyDown(KEY_LCTRL) || input->GetKeyDown(KEY_RCTRL);
#else
    bool superdown = input->GetKeyDown(KEY_LGUI) || input->GetKeyDown(KEY_RGUI);
#endif

    MODIFIER_KEYS mod = GetModifierKeys(qualifiers, superdown);


    static double last_time = 0;
    static int counter = 1;

    Time* t = GetSubsystem<Time>();

    double time = t->GetElapsedTime() * 1000;
    if (time < last_time + 600)
        counter++;
    else
        counter = 1;

    last_time = time;


    IntVector2 viewPos;
    tb::TBWidget* widget = UI::GetInternalWidgetAndProjectedPositionFor(pos, viewPos);

    if (button == MOUSEB_RIGHT)
        widget->InvokeRightPointerDown(viewPos.x_, viewPos.y_, counter, mod);
    else
        widget->InvokePointerDown(viewPos.x_, viewPos.y_, counter, mod, false);
}


void UI::HandleMouseButtonUp(StringHash eventType, VariantMap& eventData)
{
    if (inputDisabled_ || consoleVisible_)
        return;

    using namespace MouseButtonUp;
    unsigned button = eventData[P_BUTTON].GetUInt();

    IntVector2 pos;

    Input* input = GetSubsystem<Input>();
    pos = input->GetMousePosition();
    int qualifiers = input->GetQualifiers();

#ifdef ATOMIC_PLATFORM_WINDOWS
    bool superdown = input->GetKeyDown(KEY_LCTRL) || input->GetKeyDown(KEY_RCTRL);
#else
    bool superdown = input->GetKeyDown(KEY_LGUI) || input->GetKeyDown(KEY_RGUI);
#endif

    MODIFIER_KEYS mod = GetModifierKeys(qualifiers, superdown);


    IntVector2 viewPos;
    tb::TBWidget* widget = UI::GetInternalWidgetAndProjectedPositionFor(pos, viewPos);

    if (button == MOUSEB_RIGHT)
        widget->InvokeRightPointerUp(viewPos.x_, viewPos.y_, mod);
    else
        widget->InvokePointerUp(viewPos.x_, viewPos.y_, mod, false);

    // InvokePointerUp() seems to do the right thing no mater which root widget gets the call.
}


void UI::HandleMouseMove(StringHash eventType, VariantMap& eventData)
{
    using namespace MouseMove;

    if (inputDisabled_ || consoleVisible_)
        return;

    IntVector2 pos(eventData[P_X].GetInt(), eventData[P_Y].GetInt());


    IntVector2 viewPos;
    tb::TBWidget* widget = UI::GetInternalWidgetAndProjectedPositionFor(pos, viewPos);

    widget->InvokePointerMove(viewPos.x_, viewPos.y_, tb::TB_MODIFIER_NONE, false);

    tooltipHoverTime_ = 0;
}


void UI::HandleMouseWheel(StringHash eventType, VariantMap& eventData)
{
    if (inputDisabled_ || consoleVisible_)
        return;

    using namespace MouseWheel;

    int delta = eventData[P_WHEEL].GetInt();
    Input* input = GetSubsystem<Input>();
    IntVector2 pos(input->GetMousePosition().x_, input->GetMousePosition().y_);


    IntVector2 viewPos;
    tb::TBWidget* widget = UI::GetInternalWidgetAndProjectedPositionFor(pos, viewPos);

    widget->InvokeWheel(viewPos.x_, viewPos.y_, 0, -delta, tb::TB_MODIFIER_NONE);
}

//Touch Input
void UI::HandleTouchBegin(StringHash eventType, VariantMap& eventData)
{
    if (inputDisabled_ || consoleVisible_)
        return;

    using namespace TouchBegin;

    int touchId = eventData[P_TOUCHID].GetInt();
    IntVector2 pos(eventData[P_X].GetInt(), eventData[P_Y].GetInt());

    static double last_time = 0;
    static int counter = 1;

    Time* t = GetSubsystem<Time>();

    double time = t->GetElapsedTime() * 1000;
    if (time < last_time + 600)
        counter++;
    else
        counter = 1;

    last_time = time;


    IntVector2 viewPos;
    tb::TBWidget* widget = UI::GetInternalWidgetAndProjectedPositionFor(pos, viewPos);

    widget->InvokePointerDown(viewPos.x_, viewPos.y_, counter, TB_MODIFIER_NONE, true, touchId);
}

void UI::HandleTouchMove(StringHash eventType, VariantMap& eventData)
{
    if (inputDisabled_ || consoleVisible_)
        return;

    using namespace TouchMove;

    int touchId = eventData[P_TOUCHID].GetInt();
    IntVector2 pos(eventData[P_X].GetInt(), eventData[P_Y].GetInt());


    IntVector2 viewPos;
    tb::TBWidget* widget = UI::GetInternalWidgetAndProjectedPositionFor(pos, viewPos);

    widget->InvokePointerMove(viewPos.x_, viewPos.y_, TB_MODIFIER_NONE, true, touchId);
}

void UI::HandleTouchEnd(StringHash eventType, VariantMap& eventData)
{
    if (inputDisabled_ || consoleVisible_)
        return;

    using namespace TouchEnd;

    int touchId = eventData[P_TOUCHID].GetInt();
    IntVector2 pos(eventData[P_X].GetInt(), eventData[P_Y].GetInt());


    IntVector2 viewPos;
    tb::TBWidget* widget = UI::GetInternalWidgetAndProjectedPositionFor(pos, viewPos);

    widget->InvokePointerUp(viewPos.x_, viewPos.y_, TB_MODIFIER_NONE, true, touchId);
}

static bool InvokeShortcut(UI* ui, int key, SPECIAL_KEY special_key, MODIFIER_KEYS modifierkeys, bool down)
{
#ifdef __APPLE__
    bool shortcut_key = (modifierkeys & TB_SUPER) ? true : false;
#else
    bool shortcut_key = (modifierkeys & TB_CTRL) ? true : false;
#endif
    if (!down || (!shortcut_key && special_key ==TB_KEY_UNDEFINED))
        return false;
    bool reverse_key = (modifierkeys & TB_SHIFT) ? true : false;
    int upper_key = toupr_ascii(key);
    TBID id;
    if (upper_key == 'X')
        id = TBIDC("cut");
    else if (upper_key == 'C' || special_key == TB_KEY_INSERT)
        id = TBIDC("copy");
    else if (upper_key == 'V' || (special_key == TB_KEY_INSERT && reverse_key))
        id = TBIDC("paste");
    else if (upper_key == 'A')
        id = TBIDC("selectall");
    else if (upper_key == 'Z' || upper_key == 'Y')
    {
        bool undo = upper_key == 'Z';
        if (reverse_key)
            undo = !undo;
        id = undo ? TBIDC("undo") : TBIDC("redo");
    }
    else if (upper_key == 'N')
        id = TBIDC("new");
    else if (upper_key == 'O')
        id = TBIDC("open");
    else if (upper_key == 'S')
        id = TBIDC("save");
    else if (upper_key == 'W')
        id = TBIDC("close");
    else if (upper_key == 'F')
        id = TBIDC("find");
 #ifdef ATOMIC_PLATFORM_OSX
    else if (upper_key == 'G' && (modifierkeys & TB_SHIFT))
        id = TBIDC("findprev");
    else if (upper_key == 'G')
        id = TBIDC("findnext");
#else
    else if (special_key == TB_KEY_F3 && (modifierkeys & TB_SHIFT))
        id = TBIDC("findprev");
    else if (special_key == TB_KEY_F3)
        id = TBIDC("findnext");

#endif
    else if (upper_key == 'P')
        id = TBIDC("play");
    else if (special_key == TB_KEY_PAGE_UP)
        id = TBIDC("prev_doc");
    else if (special_key == TB_KEY_PAGE_DOWN)
        id = TBIDC("next_doc");
    else
        return false;

    TBWidgetEvent ev(EVENT_TYPE_SHORTCUT);
    ev.modifierkeys = modifierkeys;
    ev.ref_id = id;

    TBWidget* eventWidget = TBWidget::focused_widget;

    if (id == TBIDC("save") || id == TBIDC("close")) {

        while (eventWidget && !eventWidget->GetDelegate()) {

            eventWidget = eventWidget->GetParent();
        }

    }

    if (!eventWidget || !eventWidget->InvokeEvent(ev))
    {
        VariantMap evData;
        evData[UIUnhandledShortcut::P_REFID] = id;
        ui->SendEvent(E_UIUNHANDLEDSHORTCUT, evData);
        return false;
    }

    return true;
}

bool UI::InvokeKey(unsigned key, unsigned special_key, unsigned modifierkeys, bool keydown)
{
    if (InvokeShortcut(this, key, SPECIAL_KEY(special_key), MODIFIER_KEYS(modifierkeys), keydown))
        return true;

    for (HashSet<UIOffscreenView*>::Iterator it = offscreenViews_.Begin(); it != offscreenViews_.End(); ++it)
    {
        UIOffscreenView* osView = *it;
        IntRect rect = osView->inputRect_;
        Camera* camera = osView->inputCamera_;
        Octree* octree = osView->inputOctree_;
        Drawable* drawable = osView->inputDrawable_;

        if (!camera || !octree || !drawable)
            continue;

        if (osView->GetInternalWidget()->InvokeKey(key, SPECIAL_KEY(special_key), MODIFIER_KEYS(modifierkeys), keydown))
            return true;
    }

    return rootWidget_->InvokeKey(key, SPECIAL_KEY(special_key), MODIFIER_KEYS(modifierkeys), keydown);
}


void UI::HandleKey(bool keydown, int keycode, int scancode)
{
    if (keydown && (keycode == KEY_ESCAPE || keycode == KEY_RETURN || keycode == KEY_RETURN2 || keycode == KEY_KP_ENTER)
            && TBWidget::focused_widget)
    {
        SendEvent(E_UIWIDGETFOCUSESCAPED);
    }

#ifdef ATOMIC_PLATFORM_WINDOWS
    if (keycode == KEY_LCTRL || keycode == KEY_RCTRL)
        return;
#else
    if (keycode == KEY_LGUI || keycode == KEY_RGUI)
        return;
#endif

    Input* input = GetSubsystem<Input>();
    int qualifiers = input->GetQualifiers();

#ifdef ATOMIC_PLATFORM_WINDOWS
    bool superdown = input->GetKeyDown(KEY_LCTRL) || input->GetKeyDown(KEY_RCTRL);
#else
    bool superdown = input->GetKeyDown(KEY_LGUI) || input->GetKeyDown(KEY_RGUI);
#endif
    MODIFIER_KEYS mod = GetModifierKeys(qualifiers, superdown);

    SPECIAL_KEY specialKey = TB_KEY_UNDEFINED;

    switch (keycode)
    {
    case KEY_RETURN:
    case KEY_RETURN2:
    case KEY_KP_ENTER:
        specialKey =  TB_KEY_ENTER;
        break;
    case KEY_F1:
        specialKey = TB_KEY_F1;
        break;
    case KEY_F2:
        specialKey = TB_KEY_F2;
        break;
    case KEY_F3:
        specialKey = TB_KEY_F3;
        break;
    case KEY_F4:
        specialKey = TB_KEY_F4;
        break;
    case KEY_F5:
        specialKey = TB_KEY_F5;
        break;
    case KEY_F6:
        specialKey = TB_KEY_F6;
        break;
    case KEY_F7:
        specialKey = TB_KEY_F7;
        break;
    case KEY_F8:
        specialKey = TB_KEY_F8;
        break;
    case KEY_F9:
        specialKey = TB_KEY_F9;
        break;
    case KEY_F10:
        specialKey = TB_KEY_F10;
        break;
    case KEY_F11:
        specialKey = TB_KEY_F11;
        break;
    case KEY_F12:
        specialKey = TB_KEY_F12;
        break;
    case KEY_LEFT:
        specialKey = TB_KEY_LEFT;
        break;
    case KEY_UP:
        specialKey = TB_KEY_UP;
        break;
    case KEY_RIGHT:
        specialKey = TB_KEY_RIGHT;
        break;
    case KEY_DOWN:
        specialKey = TB_KEY_DOWN;
        break;
    case KEY_PAGEUP:
        specialKey = TB_KEY_PAGE_UP;
        break;
    case KEY_PAGEDOWN:
        specialKey = TB_KEY_PAGE_DOWN;
        break;
    case KEY_HOME:
        specialKey = TB_KEY_HOME;
        break;
    case KEY_END:
        specialKey = TB_KEY_END;
        break;
    case KEY_INSERT:
        specialKey = TB_KEY_INSERT;
        break;
    case KEY_TAB:
        specialKey = TB_KEY_TAB;
        break;
    case KEY_DELETE:
        specialKey = TB_KEY_DELETE;
        break;
    case KEY_BACKSPACE:
        specialKey = TB_KEY_BACKSPACE;
        break;
    case KEY_ESCAPE:
        specialKey =  TB_KEY_ESC;
        break;
    }

    if (specialKey == TB_KEY_UNDEFINED)
    {
        if (mod & TB_SUPER)
        {
            InvokeKey(keycode, TB_KEY_UNDEFINED, mod, keydown);
        }
    }
    else
    {
        InvokeKey(0, specialKey, mod, keydown);
    }
}

void UI::HandleKeyDown(StringHash eventType, VariantMap& eventData)
{
    if (inputDisabled_ || keyboardDisabled_ || consoleVisible_)
        return;

    using namespace KeyDown;

    int keycode = eventData[P_KEY].GetInt();
    int scancode = eventData[P_SCANCODE].GetInt();

    HandleKey(true, keycode, scancode);

    // Send Global Shortcut
    Input* input = GetSubsystem<Input>();

#ifdef ATOMIC_PLATFORM_WINDOWS
    bool superdown = input->GetKeyDown(KEY_LCTRL) || input->GetKeyDown(KEY_RCTRL);
    if (keycode == KEY_LCTRL || keycode == KEY_RCTRL)
        superdown = false;
#else
    bool superdown = input->GetKeyDown(KEY_LGUI) || input->GetKeyDown(KEY_RGUI);

    if (keycode == KEY_LGUI || keycode == KEY_RGUI)
        superdown = false;
#endif

    if (!superdown)
        return;

    VariantMap shortcutData;
    shortcutData[UIShortcut::P_KEY] = keycode;
    shortcutData[UIShortcut::P_QUALIFIERS] = eventData[P_QUALIFIERS].GetInt();

    SendEvent(E_UISHORTCUT, shortcutData);
}

void UI::HandleKeyUp(StringHash eventType, VariantMap& eventData)
{
    if (inputDisabled_ || keyboardDisabled_ || consoleVisible_)
        return;

    using namespace KeyUp;

    int keycode = eventData[P_KEY].GetInt();
    int scancode = eventData[P_SCANCODE].GetInt();

    HandleKey(false, keycode, scancode);
}

void UI::HandleTextInput(StringHash eventType, VariantMap& eventData)
{
    if (inputDisabled_ || keyboardDisabled_ || consoleVisible_)
        return;

    using namespace TextInput;

    const String& text = eventData[P_TEXT].GetString();

    for (unsigned i = 0; i < text.Length(); i++)
    {
        InvokeKey(text[i], TB_KEY_UNDEFINED, TB_MODIFIER_NONE, true);
        InvokeKey(text[i], TB_KEY_UNDEFINED, TB_MODIFIER_NONE, false);
    }
}
}