/*  Starshatter OpenSource Distribution
    Copyright (c) 1997-2004, Destroyer Studios LLC.
    All Rights Reserved.

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

    * Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.
    * 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.
    * Neither the name "Destroyer Studios" nor the names of its contributors
      may be used to endorse or promote products derived from this software
      without specific prior written permission.

    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 HOLDER 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.

    SUBSYSTEM:    nGenEx.lib
    FILE:         ComboList.cpp
    AUTHOR:       John DiCamillo


    OVERVIEW
    ========
    Drop-down list of Buttons class
*/

#define NOMINMAX

#include <algorithm>

#include "MemDebug.h"
#include "ComboList.h"
#include "ComboBox.h"
#include "Button.h"
#include "Video.h"
#include "Bitmap.h"
#include "Font.h"
#include "Screen.h"

// +--------------------------------------------------------------------+

ComboList::ComboList(ComboBox* ctrl, ActiveWindow* p, int ax, int ay, int aw, int ah, int maxentries)
    : ScrollWindow(p, ax, ay, aw, ah + (ah-2)*maxentries + 2, 0, 0, p), combo_box(ctrl)
{
    button_state   = 0;
    button_height  = ah;
    captured       = 0;
    seln           = -1;
    max_entries    = maxentries;
    scroll         = 0;
    scrolling      = false;
    border         = true;
    animated       = true;
    bevel_width    = 5;

    if (ctrl)
    CopyStyle(*ctrl);

    rect.h = (ah-2)*maxentries + 2;

    int screen_height = Video::GetInstance()->Height();

    if (rect.h > screen_height) {
        rect.y = 0;
        rect.h = screen_height;
    }

    else if (rect.y + rect.h > screen_height) {
        rect.y = screen_height - rect.h;
    }
}

ComboList::ComboList(ComboBox* ctrl, Screen* s, int ax, int ay, int aw, int ah, int maxentries)
    : ScrollWindow(s, ax, ay, aw, ah + (ah-2)*maxentries + 2, 0), combo_box(ctrl)
{
    button_state   = 0;
    button_height  = ah;
    captured       = 0;
    seln           = -1;
    max_entries    = maxentries;
    scroll         = 0;
    scrolling      = false;
    border         = true;
    animated       = true;
    bevel_width    = 5;

    if (ctrl)
    CopyStyle(*ctrl);

    rect.h = (ah-2)*maxentries + 2;

    int screen_height = Video::GetInstance()->Height();

    if (rect.h > screen_height) {
        rect.y = 0;
        rect.h = screen_height;
    }

    else if (rect.y + rect.h > screen_height) {
        rect.y = screen_height - rect.h;
    }

    screen->AddWindow(this);   // just in case the base ctor couldn't do this
}

// +--------------------------------------------------------------------+

ComboList::~ComboList()
{
    items.destroy();
}

// +--------------------------------------------------------------------+

void
ComboList::CopyStyle(const ComboBox& ctrl)
{
    active_color   = ctrl.GetActiveColor();
    border_color   = ctrl.GetBorderColor();
    fore_color     = ctrl.GetForeColor();
    back_color     = ctrl.GetBackColor();

    animated       = ctrl.GetAnimated();
    bevel_width    = ctrl.GetBevelWidth();
    border         = ctrl.GetBorder();
}

// +--------------------------------------------------------------------+

void
ComboList::Show()
{
    if (!scrolling) {
        scrolling = 1;
        scroll    = 0;
    }

    ScrollWindow::Show();
}

void
ComboList::Hide()
{
    scrolling = 0;
    scroll    = 0;
    ScrollWindow::Hide();
}

// +--------------------------------------------------------------------+

void
ComboList::Draw()
{
    int x = 0;
    int y = 0;
    int w = rect.w;
    int h = button_height;

    int index   = 0;

    // opening:
    if (scrolling > 0) {
        int limit = std::min(items.size(), max_entries);

        if (scroll < limit) {
            if (limit > 6)
            scroll += 4;

            else if (limit > 4)
            scroll += 2;

            else
            scroll += 1;
        }

        if (scroll >= limit) {
            scroll    = limit;
            scrolling = 0;
        }
    }

    // closing:
    else if (scrolling < 0) {
        if (scroll > 0)
        scroll--;
        else
        scrolling = 0;
    }

    if (items.size() < 1) {
        Rect btn_rect(x,y,w,h);
        DrawItem(" ", btn_rect, 0);
    }
    else {
        ListIter<Text> item = items;
        while (++item && index < max_entries) {
            Rect btn_rect(x,y,w,h);
            int sub_state = (index == seln) ? button_state : 0;

            DrawItem(*item, btn_rect, sub_state);

            y += button_height-2;
            index++;
        }
    }

    DrawRect(0,0,rect.w-1,rect.h-1,fore_color);
}

// +--------------------------------------------------------------------+

void
ComboList::DrawRectSimple(Rect& rect, int state)
{
    if (state && active_color != Color::Black)
    FillRect(rect, active_color);
    else
    FillRect(rect, back_color);
}

void
ComboList::DrawItem(Text label, Rect& btn_rect, int state)
{
    int x = btn_rect.x;
    int y = btn_rect.y;
    int w = btn_rect.w;
    int h = btn_rect.h;

    // draw the bevel:
    DrawRectSimple(btn_rect, state);

    // draw text here:
    if (font && label.length()) {
        int border_size = 4;

        if (style & WIN_RAISED_FRAME && style & WIN_SUNK_FRAME)
        border_size = 8;

        Rect label_rect = CalcLabelRect(btn_rect);
        int  vert_space = label_rect.h;
        int  horz_space = label_rect.w;

        DrawText(label.data(), 0, label_rect, DT_CALCRECT | DT_WORDBREAK | text_align);
        vert_space = (vert_space - label_rect.h)/2;

        label_rect.w = horz_space;

        if (vert_space > 0)
        label_rect.y += vert_space;

        if (animated && state > 0) {
            label_rect.x += state;
            label_rect.y += state;
        }

        font->SetColor(fore_color);
        DrawText(label.data(), 0, label_rect, DT_WORDBREAK | text_align);
    }
}

Rect ComboList::CalcLabelRect(const Rect& btn_rect)
{
    // fit the text in the bevel:
    Rect label_rect = btn_rect;
    label_rect.Deflate(bevel_width, bevel_width);

    return label_rect;
}

int ComboList::CalcSeln(int x, int y)
{
    y -= rect.y;

    if (button_height < 1)
    return 0;

    return (int) (y / (button_height-2));
}

// +--------------------------------------------------------------------+

int ComboList::OnMouseMove(int x, int y)
{
    if (captured)
    {
        ActiveWindow* test = GetCapture();

        if (test != this)
        {
            captured = false;
            button_state = -1;
        }
    }

    int new_seln = CalcSeln(x,y);

    if (new_seln != seln) {
        seln = new_seln;
        Button::PlaySound(Button::SND_COMBO_HILITE);
    }

    return ActiveWindow::OnMouseMove(x,y);
}

int ComboList::OnLButtonDown(int x, int y)
{
    if (!captured)
    captured = SetCapture();

    seln = CalcSeln(x,y);
    button_state = 1;

    return ActiveWindow::OnLButtonDown(x,y);
}

int ComboList::OnLButtonUp(int x, int y)
{
    if (captured) {
        ReleaseCapture();
        captured = 0;
    }

    seln = CalcSeln(x,y);
    button_state = -1;
    return ActiveWindow::OnLButtonUp(x,y);
}

int ComboList::OnClick()
{
    return ActiveWindow::OnClick();
}

int ComboList::OnMouseEnter(int mx, int my)
{
    if (button_state == 0)
    button_state = -1;

    return ActiveWindow::OnMouseEnter(mx, my);
}

int ComboList::OnMouseExit(int mx, int my)
{
    if (button_state == -1)
    button_state = 0;

    return ActiveWindow::OnMouseExit(mx, my);
}

void ComboList::KillFocus()
{
    if (combo_box)
    combo_box->HideList();
}

// +--------------------------------------------------------------------+

void ComboList::ClearItems()
{
    items.destroy();
}

// +--------------------------------------------------------------------+

void ComboList::AddItem(const char* item)
{
    items.append(new(__FILE__,__LINE__) Text(item));
}

void ComboList::AddItems(ListIter<Text> item)
{
    while (++item)
    items.append(new(__FILE__,__LINE__) Text(*item));
}

void ComboList::SetItems(ListIter<Text> item)
{
    items.destroy();
    while (++item)
    items.append(new(__FILE__,__LINE__) Text(*item));

    // Resize window:

    int ah      = button_height;
    max_entries = items.size();
    Rect r      = rect;
    r.y    = combo_box->Y();
    int length  = max_entries;

    if (length < 1)
    length = 1;

    r.h = (ah-2)*length + 2;

    int screen_height = Video::GetInstance()->Height();

    if (r.h > screen_height) {
        r.y = 0;
        r.h = screen_height;
    }

    else if (r.y + r.h > screen_height) {
        r.y = screen_height - r.h;
    }

    MoveTo(r);
}

const char*  ComboList::GetItem(int index)
{
    if (index >= 0 && index < items.size())
    return items[index]->data();
    else
    return 0;
}

void ComboList::SetItem(int index, const char* item)
{
    if (index >= 0 && index < items.size())
    *items[index] = item;
    else
    items.append(new(__FILE__,__LINE__) Text(item));
}

int  ComboList::GetCount()
{
    return items.size();
}

const char*  ComboList::GetSelectedItem()
{
    if (seln >= 0 && seln < items.size())
    return items[seln]->data();
    else
    return 0;
}

int  ComboList::GetSelectedIndex()
{
    if (seln >= 0 && seln < items.size())
    return seln;
    else
    return -1;
}

void ComboList::SetSelection(int index)
{
    if (index >= 0 && index < items.size())
    seln = index;
}