/* 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. */

#pragma once

#include <the_Foundation/string.h>
#include <the_Foundation/rect.h>
#include <the_Foundation/vec2.h>
#include <SDL_events.h>
#include <ctype.h>

iDeclareType(Click)
iDeclareType(Widget)
iDeclareType(LabelWidget)

iBool           isCommand_SDLEvent  (const SDL_Event *d);
iBool           isCommand_UserEvent (const SDL_Event *, const char *cmd);
const char *    command_UserEvent   (const SDL_Event *);

iLocalDef iBool isResize_UserEvent(const SDL_Event *d) {
    return isCommand_UserEvent(d, "window.resized");
}
iLocalDef iBool isMetricsChange_UserEvent(const SDL_Event *d) {
    return isCommand_UserEvent(d, "metrics.changed");
}

enum iMouseWheelFlag {
    perPixel_MouseWheelFlag = iBit(9), /* e.g., trackpad or finger scroll; applied to `direction` */
};

/* Note: A future version of SDL may support per-pixel scrolling, but 2.0.x doesn't. */
iLocalDef void setPerPixel_MouseWheelEvent(SDL_MouseWheelEvent *ev, iBool set) {
    iChangeFlags(ev->direction, perPixel_MouseWheelFlag, set);
}
iLocalDef iBool isPerPixel_MouseWheelEvent(const SDL_MouseWheelEvent *ev) {
    return (ev->direction & perPixel_MouseWheelFlag) != 0;
}

#if defined (iPlatformApple)
#   define KMOD_PRIMARY     KMOD_GUI
#   define KMOD_SECONDARY   KMOD_CTRL
#else
#   define KMOD_PRIMARY     KMOD_CTRL
#   define KMOD_SECONDARY   KMOD_GUI
#endif

iBool       isMod_Sym           (int key);
int         normalizedMod_Sym   (int key);
int         keyMods_Sym         (int kmods); /* shift, alt, control, or gui */
void        toString_Sym        (int key, int kmods, iString *str);
int         openTabMode_Sym     (int kmods);

iRangei     intersect_Rangei    (iRangei a, iRangei b);
iRangei     union_Rangei        (iRangei a, iRangei b);

iLocalDef iBool equal_Rangei(iRangei a, iRangei b) {
    return a.start == b.start && a.end == b.end;
}
iLocalDef iBool isEmpty_Rangei(iRangei d) {
    return size_Range(&d) == 0;
}
iLocalDef iBool isOverlapping_Rangei(iRangei a, iRangei b) {
    return !isEmpty_Rangei(intersect_Rangei(a, b));
}

enum iRangeExtension {
    word_RangeExtension            = iBit(1),
    line_RangeExtension            = iBit(2),
    bothStartAndEnd_RangeExtension = iBit(3),
};

void        extendRange_Rangecc     (iRangecc *, iRangecc bounds, int mode);

iBool       isSelectionBreaking_Char(iChar);

/*-----------------------------------------------------------------------------------------------*/

iDeclareType(Anim)

enum iAnimFlag {
    indefinite_AnimFlag = iBit(1), /* does not end; must be linear */
    easeIn_AnimFlag     = iBit(2),
    easeOut_AnimFlag    = iBit(3),
    easeBoth_AnimFlag   = easeIn_AnimFlag | easeOut_AnimFlag,
    softer_AnimFlag     = iBit(4),
};

struct Impl_Anim {
    float    from, to;
    uint32_t when, due;
    int      flags;
};

void    init_Anim           (iAnim *, float value);
void    setValue_Anim       (iAnim *, float to, uint32_t span);
void    setValueSpeed_Anim  (iAnim *, float to, float unitsPerSecond);
void    setValueEased_Anim  (iAnim *, float to, uint32_t span);
void    setFlags_Anim       (iAnim *, int flags, iBool set);
void    stop_Anim           (iAnim *);

iBool   isFinished_Anim     (const iAnim *);
float   pos_Anim            (const iAnim *);
float   value_Anim          (const iAnim *);

iLocalDef float targetValue_Anim(const iAnim *d) {
    return d->to;
}
iLocalDef iBool isLinear_Anim(const iAnim *d) {
    return (d->flags & (easeIn_AnimFlag | easeOut_AnimFlag)) == 0;
}

/*-----------------------------------------------------------------------------------------------*/

enum iClickResult {
    none_ClickResult,
    started_ClickResult,
    drag_ClickResult,
    finished_ClickResult,
    aborted_ClickResult,
};

struct Impl_Click {
    iBool    isActive;
    int      button;
    int      count;
    iWidget *bounds;
    iInt2    startPos;
    iInt2    pos;
};

void                init_Click          (iClick *, iAnyObject *widget, int button);
enum iClickResult   processEvent_Click  (iClick *, const SDL_Event *event);
void                cancel_Click        (iClick *);

iBool               isMoved_Click       (const iClick *);
iInt2               pos_Click           (const iClick *);
iRect               rect_Click          (const iClick *);
iInt2               delta_Click         (const iClick *);

/*-----------------------------------------------------------------------------------------------*/

iWidget *       makePadding_Widget  (int size);
iLabelWidget *  makeHeading_Widget  (const char *text);
iWidget *       makeHDiv_Widget     (void);
iWidget *       makeVDiv_Widget     (void);
iWidget *       addAction_Widget    (iWidget *parent, int key, int kmods, const char *command);

/*-----------------------------------------------------------------------------------------------*/

iWidget *       makeToggle_Widget       (const char *id);
void            setToggle_Widget        (iWidget *toggle, iBool active);

/*-----------------------------------------------------------------------------------------------*/

iDeclareType(MenuItem)

struct Impl_MenuItem {
    const char *label;
    int key;
    int kmods;
    const char *command;
};

iWidget *   makeMenu_Widget     (iWidget *parent, const iMenuItem *items, size_t n); /* returns no ref */
void        openMenu_Widget     (iWidget *, iInt2 coord);
void        openMenuFlags_Widget(iWidget *d, iInt2 coord, iBool postCommands);
void        closeMenu_Widget    (iWidget *);

iLabelWidget *  findMenuItem_Widget (iWidget *menu, const char *command);

int         checkContextMenu_Widget (iWidget *, const SDL_Event *ev); /* see macro below */

#define processContextMenuEvent_Widget(menu, sdlEvent, stmtEaten) \
    for (const int result = checkContextMenu_Widget((menu), (sdlEvent));;) { \
        if (result) { {stmtEaten;} return result >> 1; } \
        break; \
    }

iLabelWidget *  makeMenuButton_LabelWidget  (const char *label, const iMenuItem *items, size_t n);

/*-----------------------------------------------------------------------------------------------*/

iWidget *       makeTabs_Widget         (iWidget *parent);
void            appendTabPage_Widget    (iWidget *tabs, iWidget *page, const char *label, int key, int kmods);
void            prependTabPage_Widget   (iWidget *tabs, iWidget *page, const char *label, int key, int kmods);
iWidget *       removeTabPage_Widget    (iWidget *tabs, size_t index); /* returns the page */
void            resizeToLargestPage_Widget  (iWidget *tabs);
void            showTabPage_Widget      (iWidget *tabs, const iWidget *page);
void            setTabPageLabel_Widget  (iWidget *tabs, const iAnyObject *page, const iString *label);
iWidget *       tabPage_Widget          (iWidget *tabs, size_t index);
iLabelWidget *  tabPageButton_Widget    (iWidget *tabs, const iAnyObject *page);
iBool           isTabButton_Widget      (const iWidget *);
size_t          tabPageIndex_Widget     (const iWidget *tabs, const iAnyObject *page);
const iWidget * currentTabPage_Widget   (const iWidget *tabs);
size_t          tabCount_Widget         (const iWidget *tabs);

/*-----------------------------------------------------------------------------------------------*/

iWidget *   makeSheet_Widget        (const char *id);
void        finalizeSheet_Widget    (iWidget *sheet);
iWidget *   makeDialogButtons_Widget(const iMenuItem *actions, size_t numActions);

void        makeFilePath_Widget     (iWidget *parent, const iString *initialPath, const char *title,
                                     const char *acceptLabel, const char *command);
iWidget *   makeValueInput_Widget   (iWidget *parent, const iString *initialValue, const char *title,
                                     const char *prompt, const char *acceptLabel, const char *command);
void        updateValueInput_Widget (iWidget *, const char *title, const char *prompt);
iWidget *   makeMessage_Widget      (const char *title, const char *msg);
iWidget *   makeQuestion_Widget     (const char *title, const char *msg,
                                     const iMenuItem *items, size_t numItems);

iWidget *   makePreferences_Widget      (void);
iWidget *   makeBookmarkEditor_Widget   (void);
iWidget *   makeBookmarkCreation_Widget (const iString *url, const iString *title, iChar icon);
iWidget *   makeIdentityCreation_Widget (void);
iWidget *   makeFeedSettings_Widget     (uint32_t bookmarkId);
iWidget *   makeTranslation_Widget      (iWidget *parent);

const char *    languageId_String   (const iString *menuItemLabel);
int             languageIndex_CStr  (const char *langId);