#include "app.h"

int keyInit(Key *k, Layout *l) {

  k->l = l;

  k->down = 0;

  k->downKeycode = 0;

  k->mx = k->my = 0;

  k->isLetter = k->isKeypad = 0;

  k->x = k->y = k->w = k->h = 0;

  k->prevHeld = k->nextHeld = NULL;

  k->orig = k->clone = NULL;

  inputPrepareKeysyms(&k->keySym, &k->keySym2, &k->isLetter, &k->isKeypad);

  if (!k->label[0]) keysymString(k->keySym, k->label);

  if (!k->label2[0]) keysymString(k->keySym2, k->label2);

  textLayoutInit(&k->tl, &k->l->kbd->app->graph, k->label);

  textLayoutInit(&k->tl2, &k->l->kbd->app->graph, k->label2);

  return 1;

}

void keyDeinit(Key *k) {

  keyUp(k, 1);

  textLayoutDeinit(&k->tl);

  textLayoutDeinit(&k->tl2);

}

void keyInvalidateRect(Key* k) {

  if (k->orig) k = k->orig;

  while(k) {

    appInvalidateRect(k->l->kbd->app, k->x, k->y, k->w, k->h);

    k = k->clone;

  }

}

void keyDraw(Key *k, int cx, int cy, int cw, int ch) {

  if ( k->x + k->w <= cx || k->x >= cx + cw

    || k->y + k->h <= cy || k->y >= cy + ch ) return;

  App *app = k->l->kbd->app;

  int active = k->down;

  if (k->orig)

    active = k->orig->down;

  if (!active && (k->flags & KF_MOD))

    active = (app->input.modifiers & (unsigned int)k->optValue);

  graphDrawButton(&k->l->kbd->app->graph, k->x, k->y, k->w, k->h, active);

  TextLayout *tl = &k->tl;  

  TextLayout *tl2 = &k->tl2;

  if (inputChooseKeysym(app->input.modifiers, k->keySym, k->keySym2, k->isLetter, k->isKeypad))

    tl = tl2, tl2 = &k->tl; // swap labels

  int lx, lx2, ly, ly2;

  lx = lx2 = k->x + k->w/2;

  ly = ly2 = k->y + k->h/2;

  if (!k->isLetter && k->label2[0]) {

    lx -= k->w/8;

    ly += k->h/8;

    lx2 += k->w/4;

    ly2 -= k->h/4;

  }

  textLayoutDraw(tl, lx, ly, active);

  if (!k->isLetter)

    textLayoutDraw(tl2, lx2, ly2, active);

}

void keyDown(Key *k, int x, int y) {

  if (k->orig)

    return keyDown(k->orig, x, y);

  if (k->down == 2) k->down = 1;

  if (k->down) return;

  Keyboard *kbd = k->l->kbd;

  k->down = 1;

  if (k->flags & KF_MOVE) {

    k->mx = x;

    k->my = y;

  } else

  if (k->flags & KF_SIZE) {

    k->mx = kbd->app->w - x;

    k->my = kbd->app->h - y;

  }

  if (k->flags & KF_HOLD) {

    k->down = 2;

    // insert to held list

    if (!k->prevHeld && !k->nextHeld && kbd->firstHeld != k) {

      k->nextHeld = kbd->firstHeld;

      if (k->nextHeld) k->nextHeld->prevHeld = k;

      kbd->firstHeld = k;

    }

  }

  // choose keySym

  unsigned int keySym = inputChooseKeysym(kbd->app->input.modifiers, k->keySym, k->keySym2, k->isLetter, k->isKeypad)

                      ? k->keySym2 : k->keySym;

  // press

  if (keySym) {

    k->downKeycode = inputKeycode(&kbd->app->input, keySym);

    if (k->downKeycode) inputEvent(&kbd->app->input, k->downKeycode, 1);

  }

  // redraw

  keyInvalidateRect(k);

}

void keyMotion(Key *k, int x, int y) {

  if (k->orig)

    return keyMotion(k->orig, x, y);

  App *app = k->l->kbd->app;

  if (k->flags & KF_MOVE) {

    appMove(app, app->x + x - k->mx, app->y + y - k->my, app->w, app->h);

  } else

  if (k->flags & KF_SIZE) {

    appMove(app, app->x, app->y, x + k->mx, y + k->my);

  }

}

void keyUp(Key *k, int force) {

  if (k->orig) {

    // clones must not be in held list

    assert( !(k->prevHeld || k->nextHeld || k->l->kbd->firstHeld == k) );

    return keyUp(k->orig, force);

  }

  if (!force && k->down != 1)

    return;

  Keyboard *kbd = k->l->kbd;

  int wasDown = k->down;

  k->down = 0;

  // release key

  if (k->downKeycode) {

    inputEvent(&kbd->app->input, k->downKeycode, 0);

    k->downKeycode = 0;

  }

  // remove from held list

  if (k->prevHeld || k->nextHeld || kbd->firstHeld == k) {

    if (k->nextHeld) k->nextHeld->prevHeld = k->prevHeld;

    if (k->prevHeld) k->prevHeld->nextHeld = k; else kbd->firstHeld = k->nextHeld;

    k->nextHeld = k->prevHeld = NULL;

  }

  // following action should be done only for real button up

  if (!wasDown)

    return;

  if (k->flags & KF_CLOSE)

    appStop(kbd->app, 0);

  if (k->flags & KF_LAYOUT)

    keyboardSwitchLayout(kbd, k->optValue);

  // on releasing a regular key release all held special keys

  if (!force && !k->flags)

    keyboardRelaseHeld(kbd);

  // redraw

  keyInvalidateRect(k);

}

int layoutInit(Layout *l, Keyboard *kbd) {

  LOGDBG("layout: init");

  l->kbd = kbd;

  l->prev = NULL;

  l->downKey = NULL;

  l->w = l->h = 0;

  if (!l->keysCount)

    return 1;

  // fix keys coords

  Key *k = &l->keys[0];

  int x0 = k->ox;

  int y0 = k->oy;

  int x1 = x0 + k->ow;

  int y1 = y0 + k->oh;

  for(int i = 1; i < l->keysCount; ++i) {

    k = &l->keys[i];

    Key *p = k - 1;

    // coord < 0 means relative offset from previos key -1

    // zero coord of size means copy value from previous key

    if (!k->ox) k->ox = p->ox; else

      if (k->ox < 0) k->ox = p->ox + p->ow - k->ox - 1;

    if (!k->oy) k->oy = p->oy; else

      if (k->oy < 0) k->oy = p->oy + p->oh - k->oy - 1;

    if (!k->ow) k->ow = p->ow;

    if (!k->oh) k->oh = p->oh;

    // calc bounds

    if (x0 > k->ox) x0 = k->ox;

    if (y0 > k->oy) y0 = k->oy;

    if (x1 < k->ox + k->ow) x1 = k->ox + k->ow;

    if (y1 < k->oy + k->oh) y1 = k->oy + k->oh;

  }

  // fix layout size

  if (!l->ow) l->ow = x1 + x0;

  if (!l->oh) l->oh = y1 + y0;

  LOGDBG("layout: init: size x0=%d y0=%d x1=%d y1=%d w=%d h=%d", x0, y0, x1, y1, l->ow, l->oh);

  // init keys

  for(int i = 0; i < l->keysCount; ++i) {

    if (!keyInit(&l->keys[i], l)) {

      for(--i; i >= 0; --i) keyDeinit(&l->keys[i]);

      return 0;

    }

  }

  return 1;

}

void layoutDeinit(Layout *l) {

  LOGDBG("layout: deinit");

  layoutMouseUp(l);

  for(int i = 0; i < l->keysCount; ++i)

    keyDeinit(&l->keys[i]);

}

void layoutResize(Layout *l) {

  if (l->w == l->kbd->app->w && l->h == l->kbd->app->h) return;

  LOGDBG("layout: resize w=%d h=%d", l->kbd->app->w, l->kbd->app->h);

  l->w = l->kbd->app->w;

  l->h = l->kbd->app->h;

  float kx = l->w/(float)l->ow;

  float ky = l->h/(float)l->oh;

  for(int i = 0; i < l->keysCount; ++i) {

    Key *k = &l->keys[i];

    k->x = (int)(k->ox*kx + 0.5f);

    k->y = (int)(k->oy*ky + 0.5f);

    k->w = (int)(k->ow*kx + 0.5f);

    k->h = (int)(k->oh*ky + 0.5f);

  }

}

void layoutDraw(Layout *l, int cx, int cy, int cw, int ch) {

  for(int i = 0; i < l->keysCount; ++i)

    keyDraw(&l->keys[i], cx, cy, cw, ch);

}

void layoutMouseDown(Layout *l, int x, int y) {

  LOGDBG("layout: mouse down: x=%d y=%d", x, y);

  for(int i = l->keysCount - 1; i >= 0; --i) {

    Key *k = &l->keys[i];

    if ( k->x <= x && x < k->x + k->w

      && k->y <= y && y < k->y + k->h )

    {

      if (l->downKey != k) {

        layoutMouseUp(l);

        l->downKey = k;

        keyDown(k, x, y);

      }

      break;

    }

  }

}

void layoutMouseMotion(Layout *l, int x, int y) {

  LOGDBG("layout: mouse motion: x=%d y=%d", x, y);

  if (!l->downKey) return;

  keyMotion(l->downKey, x, y);

}

void layoutMouseUp(Layout *l) {

  LOGDBG("layout: mouse up");

  if (!l->downKey) return;

  keyUp(l->downKey, 0);

  l->downKey = NULL;

}

int keyboardInit(Keyboard *kbd, App *app) {

  LOGDBG("keyboard: init");

  kbd->app = app;

  kbd->firstHeld = NULL;

  kbd->lastModifiers = kbd->app->input.modifiers;

  kbd->current = kbd->layoutsCount > 0 ? kbd->layouts : NULL;

  for(int i = 0; i < kbd->layoutsCount; ++i) {

    if (!layoutInit(&kbd->layouts[i], kbd)) {

      for(--i; i >= 0; --i) layoutDeinit(&kbd->layouts[i]);

      return 0;

    }

  }

  // fix size

  for(int i = 0; i < kbd->layoutsCount; ++i) {

    if (kbd->ow < kbd->layouts[i].ow) kbd->ow = kbd->layouts[i].ow;

    if (kbd->oh < kbd->layouts[i].oh) kbd->oh = kbd->layouts[i].oh;

  }

  LOGDBG("keyboard: init: size ow=%d oh=%d", kbd->ow, kbd->oh);

  // search clones

  for(int ila = 0; ila < kbd->layoutsCount; ++ila)

  for(int ika = 0; ika < kbd->layouts[ila].keysCount; ++ika) {

    Key *a = &kbd->layouts[ila].keys[ika];

    if (!a->orig)

    for(int ilb = ila; ilb < kbd->layoutsCount; ++ilb)

    for(int ikb = ilb==ila ? ika+1: 0; ikb < kbd->layouts[ilb].keysCount; ++ikb) {

      Key *b = &kbd->layouts[ilb].keys[ikb];

      if ( a->flags    == b->flags

        && a->optValue == b->optValue

        && a->keySym   == b->keySym

        && a->keySym2  == b->keySym2 )

      {

        b->orig = a;

        b->clone = a->clone;

        a->clone = b;

      }

    }

  }

  //appMove(app, app->x, app->y, kbd->ow, kbd->oh);

  return 1;

}

void keyboardDeinit(Keyboard *kbd) {

  LOGDBG("keyboard: deinit");

  keyboardMouseUp(kbd);

  for(int i = 0; i < kbd->layoutsCount; ++i)

    layoutDeinit(&kbd->layouts[i]);

}

void keyboardResize(Keyboard *kbd) {

  if (kbd->current)

    layoutResize(kbd->current);

}

void keyboardUpdateModifiers(Keyboard* kbd) {

  if (kbd->lastModifiers == kbd->app->input.modifiers) return;

  LOGDBG("keyboard: update modifiers");

  kbd->lastModifiers = kbd->app->input.modifiers;

  appInvalidateRect(kbd->app, 0, 0, kbd->app->w, kbd->app->h);

}

void keyboardDraw(Keyboard *kbd, int cx, int cy, int cw, int ch) {

  if (!kbd->current) return;

  layoutDraw(kbd->current, cx, cy, cw, ch);

}

void keyboardMouseDown(Keyboard *kbd, int x, int y) {

  LOGDBG("keyboard: mouse down: x=%d y=%d", x, y);

  if (!kbd->current) return;

  layoutMouseDown(kbd->current, x, y);

}

void keyboardMouseMotion(Keyboard *kbd, int x, int y) {

  LOGDBG("keyboard: mouse motion: x=%d y=%d", x, y);

  if (!kbd->current) return;

  layoutMouseMotion(kbd->current, x, y);

}

void keyboardMouseUp(Keyboard *kbd) {

  LOGDBG("keyboard: mouse up");

  if (!kbd->current) return;

  layoutMouseUp(kbd->current);

}

void keyboardRelaseHeld(Keyboard *kbd) {

  LOGDBG("keyboard: release held");

  while(kbd->firstHeld) keyUp(kbd->firstHeld, 1);

}

void keyboardSwitchLayout(Keyboard *kbd, int index) {

  if (!kbd->layoutsCount) return;

  int prevIndex = kbd->current - kbd->layouts;

  int remember = 1;

  LOGDBG("keyboard: switch layout: prevIndex=%d nextIndex=%d", prevIndex, index);

  //keyboardRelaseHeld(kbd);

  if (index == LI_PREV) {

    index = kbd->current ? prevIndex - 1: 0;

    if (index < 0) index = kbd->layoutsCount - 1;

  } else

  if (index == LI_NEXT) {

    index = kbd->current ? prevIndex + 1: 0;

    if (index >= kbd->layoutsCount) index = 0;

  } else

  if (index == LI_REVERT) {

    if (!kbd->current || !kbd->current->prev)

      return;

    index = kbd->current->prev - kbd->layouts;

    remember = 0;

    return;

  }

  if (index < 0 || index >= kbd->layoutsCount) {

    LOGWRN("keyboard: switch layout: bad index %d", index);

    return;

  }

  LOGDBG("keyboard: switch layout: actual index=%d", index);

  if (remember)

    kbd->layouts[index].prev = kbd->current;

  kbd->current = &kbd->layouts[index];

  keyboardResize(kbd);

  appInvalidateRect(kbd->app, 0, 0, kbd->app->w, kbd->app->h);

}