/*
   Copyright (c) 2011, The Mineserver Project
   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 of the The Mineserver Project 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 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.
 */

#include <math.h>

#include "../mineserver.h"
#include "../map.h"

#include "sign.h"

bool BlockSign::affectedBlock(int block)
{
  switch (block)
  {
  case BLOCK_WALL_SIGN:
  case BLOCK_SIGN_POST:
  case ITEM_SIGN:
    return true;
  }
  return false;
}


void BlockSign::onStartedDigging(User* user, int8_t status, int32_t x, int8_t y, int32_t z, int map, int8_t direction)
{
}

void BlockSign::onDigging(User* user, int8_t status, int32_t x, int8_t y, int32_t z, int map, int8_t direction)
{
}

void BlockSign::onStoppedDigging(User* user, int8_t status, int32_t x, int8_t y, int32_t z, int map, int8_t direction)
{
}

bool BlockSign::onBroken(User* user, int8_t status, int32_t x, int8_t y, int32_t z, int map, int8_t direction)
{
  Mineserver::get()->map(map)->sendBlockChange(x, y, z, BLOCK_AIR, 0);
  Mineserver::get()->map(map)->setBlock(x, y, z, BLOCK_AIR, 0);
  this->spawnBlockItem(x, y, z, map, BLOCK_WALL_SIGN);

  //Remove sign data from the chunk
  sChunk* chunk = Mineserver::get()->map(map)->chunks.getChunk(x, z);
  if (chunk != NULL)
  {
    for (uint32_t i = 0; i < chunk->signs.size(); i++)
    {
      if (chunk->signs[i]->x == x &&
          chunk->signs[i]->y == y &&
          chunk->signs[i]->z == z)
      {
        chunk->signs.erase(chunk->signs.begin() + i);
        break;
      }
    }
  }
  return false;
}

void BlockSign::onNeighbourBroken(User* user, int16_t oldblock, int32_t x, int8_t y, int32_t z, int map, int8_t direction)
{
  uint8_t block, meta;
  Mineserver::get()->map(map)->getBlock(x, y, z, &block, &meta);

  bool blockBroken = false;

  //Ladder is not attached to top or bottom block
  if (direction == BLOCK_BOTTOM)
  {
    return;
  }

  if (direction == BLOCK_TOP && block == BLOCK_SIGN_POST)
  {
    blockBroken = true;
  }
  else if (block == BLOCK_WALL_SIGN &&
           ((meta == 2 && direction == BLOCK_EAST)  ||
            (meta == 3 && direction == BLOCK_WEST)  ||
            (meta == 4 && direction == BLOCK_NORTH) ||
            (meta == 5 && direction == BLOCK_SOUTH)))
  {
    blockBroken = true;
  }


  if (blockBroken)
  {
    Mineserver::get()->map(map)->sendBlockChange(x, y, z, BLOCK_AIR, 0);
    Mineserver::get()->map(map)->setBlock(x, y, z, BLOCK_AIR, 0);
    this->spawnBlockItem(x, y, z, map, block, 0);

    //Remove sign data from the chunk
    sChunk* chunk = Mineserver::get()->map(map)->chunks.getChunk(x, z);
    if (chunk != NULL)
    {
      for (uint32_t i = 0; i < chunk->signs.size(); i++)
      {
        if (chunk->signs[i]->x == x &&
            chunk->signs[i]->y == y &&
            chunk->signs[i]->z == z)
        {
          chunk->signs.erase(chunk->signs.begin() + i);
          break;
        }
      }
    }
  }
}

bool BlockSign::onPlace(User* user, int16_t newblock, int32_t x, int8_t y, int32_t z, int map, int8_t direction)
{
  uint8_t oldblock;
  uint8_t oldmeta;

  if (!Mineserver::get()->map(map)->getBlock(x, y, z, &oldblock, &oldmeta))
  {
    revertBlock(user, x, y, z, map);
    return true;
  }

  /* Check block below allows blocks placed on top */
  if (!this->isBlockStackable(oldblock))
  {
    revertBlock(user, x, y, z, map);
    return true;
  }

  // 0x0 -> West  West  West  West
  // 0x1 -> West  West  West  North
  // 0x2 -> West  West  North North
  // 0x3 -> West  North North North
  // 0x4 -> North North North North
  // 0x5 -> North North North East
  // 0x6 -> North North East  East
  // 0x7 -> North East  East  East
  // 0x8 -> East  East  East  East
  // 0x9 -> East  East  East  South
  // 0xA -> East  East  South South
  // 0xB -> East  South South South
  // 0xC -> South South South South
  // 0xD -> South South South West
  // 0xE -> South South West  West
  // 0xF -> South West  West  West

  //           The values were the signs are facing
  //
  //                          North
  //
  //      -X |                  4
  //         |              3       5
  //         |           2             6
  //         |         1       [=]       7
  //  West   |        0         |         8           East
  //         |         F                 9
  //         |           E             A
  //         |              D       B
  //      +X |                  C
  //           ----------------------------------
  //           +Z                              -Z
  //
  //                          South


  // Were it should be placed depending on the user's position
  //
  //                          North
  //
  //      -X |                  C
  //         |              B       D
  //         |           A      o      E
  //         |         9       [ ]       F
  //  West   |        8        | |         0           East
  //         |         7                 1
  //         |           6             2
  //         |              5       3
  //      +X |                  4
  //           ----------------------------------
  //           +Z                              -Z
  //
  //                          South

  // We place according to the player's position
  double diffX = (x + 0.5) - user->pos.x; // + 0.5 to get the middle of the square
  double diffZ = (z + 0.5) - user->pos.z; // + 0.5 to get the middle of the square

  double angleDegree = ((atan2(diffZ, diffX) * 180 / M_PI + 90) / 22.5);

  uint8_t metadata;
  if (angleDegree < 0)
  {
    angleDegree += 16;
  }
  newblock = BLOCK_WALL_SIGN;
  metadata = 6 - direction;
  switch (direction)
  {
  case BLOCK_SOUTH:
    x--;
    break;
  case BLOCK_NORTH:
    x++;
    break;
  case BLOCK_EAST:
    z++;
    break;
  case BLOCK_WEST:
    z--;
    break;
  case BLOCK_TOP:
    y++;
    newblock = BLOCK_SIGN_POST;
    metadata = (uint8_t)(angleDegree + 0.5);
    break;
  case BLOCK_BOTTOM:
  default:
    revertBlock(user, x, y, z, map);
    return true;
    break;
  }

  if (!this->isBlockEmpty(x, y, z, map))
  {
    revertBlock(user, x, y, z, map);
    return true;
  }

  Mineserver::get()->map(map)->setBlock(x, y, z, (char)newblock, metadata);
  Mineserver::get()->map(map)->sendBlockChange(x, y, z, (char)newblock, metadata);
  return false;
}

void BlockSign::onNeighbourPlace(User* user, int16_t newblock, int32_t x, int8_t y, int32_t z, int map, int8_t direction)
{
}

void BlockSign::onReplace(User* user, int16_t newblock, int32_t x, int8_t y, int32_t z, int map, int8_t direction)
{
}