#include "game.h"

void gameFree(Game *gm) {

  puzzleFree(&gm->pz);

  if (gm->pz.image) animationDestroy(gm->pz.image);

  free(gm->path);

  free(gm->imgname);

  memset(gm, 0, sizeof(*gm));

}

int gameCreate(Game *gm, const char *path, const char *imgname, int rows, int cols, int turn, int seed) {

  gameFree(gm);

  char* imgpath = findImage(imgname);

  if (!imgpath) return ERR("gameCreate: cannot find image: %s", imgname);

  gm->pz.image = createAnimationEx(imgpath, TRUE, FALSE, FALSE);

  free(imgpath);

  int iw = animationGetOrigWidth(gm->pz.image);

  int ih = animationGetOrigHeight(gm->pz.image);

  if (rows < 1 || cols < 1 || rows*cols < 2) {

    int count = rows;

    if (count < 4) count = 4;

    double s = sqrt(iw*ih/(double)count);

    cols = (int)round(iw/s);

    if (cols < 1) cols = 1;

    rows = (int)round(ih/s);

    if (rows < 1) rows = 1;

  }

  double cw = iw/(double)cols;

  double ch = ih/(double)rows;

  if (cw > ch) { ch /= cw; cw = 1; }

          else { cw /= ch; ch = 1; }

  int px = (int)exp2(round(log2(1024/cols)));

  if (px < 8) px = 8;

  if (px > 1024) px = 1024;

  DBG("iw %d, ih %d, cols %d, rows %d, px %d, cw %g, ch %g", iw, ih, cols, rows, px, cw , ch);

  int prevseed = rand();

  gm->pz.turn = !!turn;

  gm->path = strprintf("%s", path);

  gm->imgname = strprintf("%s", imgname);

  gm->seed = seed;

  while(!gm->seed) gm->seed = rand();

  srand(gm->seed);

  puzzleAlloc(&gm->pz, rows, cols);

  puzzleGenLines(&gm->pz, cw, ch, 0.05, 1/5.0);

  puzzleGenChunks(&gm->pz);

  puzzleRenderChunks(&gm->pz, px, 0.3);

  srand(prevseed);

  gameSave(gm);

  return 1;

}

int gameSave(Game *gm) {

  char *tmp = strprintf("%s.tmp", gm->path);

  FILE *f = fopen(tmp, "w");

  if (!f) {

    ERR("gameSave: cannot open file for write: %s", tmp);

    free(tmp);

    return 0;

  }

  puzzleRecalcGroups(&gm->pz);

  // puzzle1

  // [[img-file]]

  // [rows] [cols] [groups] [seed]

  // [gid] [x] [y] [angle]...

  fprintf(f, "puzzle1\n[%s]\n%d %d %d %d %d\n", gm->imgname, gm->pz.rows, gm->pz.cols, !!gm->pz.turn, gm->pz.groups, gm->seed);

  Chunk *chunks = gm->pz.chunks[0];

  int cnt = gm->pz.rows * gm->pz.cols;

  for(int i = 0; i < cnt; ++i) {

    Chunk *c = &chunks[i];

    PhGroup *g = c->parent;

    Chunk *p = (Chunk*)((char*)g - offsetof(Chunk, group));

    int gid = p - chunks;

    if (p == c) fprintf(f, "%d %g %g %g\n", gid, g->o.x, g->o.y, vangled(g->dx));

           else fprintf(f, "%d\n", gid);

  }

  fflush(f);

  int err = ferror(f);

  if (err) ERR("gameSave: cannot write to file: %s", tmp);

  fclose(f);

  if (!err) {

    err = rename(tmp, gm->path);

    if (err) ERR("gameSave: cannot rename file: [%s] -> [%s]", tmp, gm->path);

  }

  if (err) remove(tmp);

  free(tmp);

  return !err;

}

static FILE* internalLoadGameInfo(GameInfo *gi, const char *path) {

  FILE *f = fopen(path, "r");

  if (!f) {

    ERR("loadGameInfo: cannot open file for read: %s", path);

    return NULL;

  }

  size_t ls = 1;

  char *l = (char*)alloc(ls);

  getline(&l, &ls, f); trim(l);

  if (strcmp(l, "puzzle1")) {

    ERR("loadGameInfo: wrong file version (expected: puzzle1): %s", l);

    free(l); fclose(f); return NULL;

  }

  getline(&l, &ls, f); unquote(l, '[', ']');

  fscanf(f, "%d%d%d%d%d", &gi->rows, &gi->cols, &gi->turn, &gi->groups, &gi->seed);

  if ( gi->rows < 1 || gi->cols < 1 || gi->rows*gi->cols < 2

    || gi->turn < 0 || gi->turn > 1

    || gi->groups < 1 || gi->groups > gi->rows*gi->cols )

  {

    ERR("loadGameInfo: bad data in file: %s, [%dx%d, %d], %d", path, gi->rows, gi->cols, gi->turn, gi->groups);

    free(l); fclose(f); return NULL;

  }

  if (ferror(f)) {

    ERR("loadGameInfo: cannot read from file: %s", path);

    free(l); fclose(f); return NULL;

  }

  gi->imgname = l;

  return f;

}

GameInfo* loadGameInfo(const char *path) {

  GameInfo gi = { .t = filetime(path) };

  FILE *f = internalLoadGameInfo(&gi, path);

  if (!f) return NULL;

  fclose(f);

  GameInfo *r = alloc(ASIZEOF(*r) + strlen(gi.imgname) + 1);

  memcpy(r, &gi, sizeof(*r));

  r->imgname = strcpy((char*)(r+1), gi.imgname);

  return r;

}

int gameLoad(Game *gm, const char *path) {

  gameFree(gm);

  GameInfo gi = {};

  FILE *f = internalLoadGameInfo(&gi, path);

  if (!f) return ERR("gameLoad: cannot load game info: %s", path);

  if (!gameCreate(gm, path, gi.imgname, gi.rows, gi.cols, gi.turn, gi.seed)) {

    ERR("gameLoad: cannot create game: %s, %s, %dx%d, seed %d", path, gi.imgname, gi.rows, gi.cols, gi.seed);

    free(gi.imgname);

    fclose(f);

    return 0;

  }

  int cnt = gm->pz.rows * gm->pz.cols;

  Chunk *chunks = gm->pz.chunks[0];

  double* coords = (double*)alloc(cnt*3*ASIZEOF(double));

  for(int i = 0; i < cnt && !feof(f); ++i) {

    int gid = -1;

    fscanf(f, "%d", &gid);

    if (gid < 0 || gid >= cnt) break;

    Chunk *c = &chunks[i];

    Chunk *p = &chunks[gid];

    if (i == gid) {

      double v[3] = {};

      fscanf(f, "%lg%lg%lg", v+0, v+1, v+2);

      if (!(v[0] == v[0]) || !(v[1] == v[1]) || !(v[2] == v[2])) {

        WRN("gameLoad: invalid chunks positions");

        break;

      }

      memcpy(coords + i*3, v, sizeof(v));

    } else {

      chunkMerge(p, c);

    }    

  }

  fclose(f);

  for(int i = 0; i < cnt; ++i) {

    Chunk *c = &chunks[i];

    if (c->parent != &c->group) continue;

    PhGroup *g = c->parent;

    g->o.x = coords[3*i + 0];

    g->o.y = coords[3*i + 1];

    g->dx = gm->pz.turn ? vcossind(coords[3*i + 2]) : vec(1,0);

    phGroupPlaceNodes(g);

  }

  free(coords);

  return 1;

}

void gameDraw(Game *gm) {

  int w = windowGetWidth();

  int h = windowGetHeight();

  Vec s = { w, h };

  saveState();

  translate(w/2, h/2);

  double pw = gm->pz.cols*gm->pz.cs.x;

  double ph = gm->pz.rows*gm->pz.cs.y;

  double k = mind(w/pw, h/ph);

  double kwin = k*0.9;

  k /= 1.5;

  if (gameWon(gm)) {

    double dt = windowGetFrameTime();

    gm->winTransition += dt;

    if (gm->winTransition > 1) gm->winTransition = 1;

    PhGroup *g0 = gm->pz.ph.first;

    k = lintr(k, kwin, gm->winTransition);

    Vec o = vlintr(g0->o, vzero(), gm->winTransition);

    double a = lintr(vangled(g0->dx), 0, gm->winTransition);

    zoom(k);

    strokeWidth(3/k);

    translate(o.x, o.y);

    rotate(a);

    rectTextured(gm->pz.image, -pw/2, -ph/2, pw, ph);

  } else {

    zoom(k);

    strokeWidth(3/k);

    Vec mouse = { mouseTransformedX(), mouseTransformedY() };

    if (mouseWentDown("left"))

      puzzleChooseChunks(&gm->pz, mouse);

    if (mouseWentUp("left"))

      puzzleReleaseChunks(&gm->pz);

    puzzleUpdate(&gm->pz, vdiv(s, 2*k), mouse);

    int cnt = gm->pz.cols*gm->pz.rows;

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

      chunkDraw(gm->pz.chunksOrder[i]);

      //chunkDrawDebug(gm->pz.chunksOrder[i]);

    }

    //physicsDrawDebug(&gm->pz.ph);

  }

  restoreState();

  /*saveState();

  noFill();

  stroke(COLOR_WHITE);

  textf(10, 10, "fps: %f", 1/windowGetFrameTime());

  restoreState();*/

}