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/*
Minetest
Copyright (C) 2014-2016 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
Copyright (C) 2015-2017 paramat

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include <fstream>
#include <typeinfo>
#include "mg_schematic.h"
#include "server.h"
#include "mapgen.h"
#include "emerge.h"
#include "map.h"
#include "mapblock.h"
#include "log.h"
#include "util/numeric.h"
#include "util/serialize.h"
#include "serialization.h"
#include "filesys.h"
#include "voxelalgorithms.h"

///////////////////////////////////////////////////////////////////////////////


SchematicManager::SchematicManager(Server *server) :
	ObjDefManager(server, OBJDEF_SCHEMATIC),
	m_server(server)
{
}


void SchematicManager::clear()
{
	EmergeManager *emerge = m_server->getEmergeManager();

	// Remove all dangling references in Decorations
	DecorationManager *decomgr = emerge->decomgr;
	for (size_t i = 0; i != decomgr->getNumObjects(); i++) {
		Decoration *deco = (Decoration *)decomgr->getRaw(i);

		try {
			DecoSchematic *dschem = dynamic_cast<DecoSchematic *>(deco);
			if (dschem)
				dschem->schematic = NULL;
		} catch (const std::bad_cast &) {
		}
	}

	ObjDefManager::clear();
}


///////////////////////////////////////////////////////////////////////////////


Schematic::Schematic()
= default;


Schematic::~Schematic()
{
	delete []schemdata;
	delete []slice_probs;
}


void Schematic::resolveNodeNames()
{
	getIdsFromNrBacklog(&c_nodes, true, CONTENT_AIR);

	size_t bufsize = size.X * size.Y * size.Z;
	for (size_t i = 0; i != bufsize; i++) {
		content_t c_original = schemdata[i].getContent();
		content_t c_new = c_nodes[c_original];
		schemdata[i].setContent(c_new);
	}
}


void Schematic::blitToVManip(MMVManip *vm, v3s16 p, Rotation rot, bool force_place)
{
	sanity_check(m_ndef != NULL);

	int xstride = 1;
	int ystride = size.X;
	int zstride = size.X * size.Y;

	s16 sx = size.X;
	s16 sy = size.Y;
	s16 sz = size.Z;

	int i_start, i_step_x, i_step_z;
	switch (rot) {
		case ROTATE_90:
			i_start  = sx - 1;
			i_step_x = zstride;
			i_step_z = -xstride;
			SWAP(s16, sx, sz);
			break;
		case ROTATE_180:
			i_start  = zstride * (sz - 1) + sx - 1;
			i_step_x = -xstride;
			i_step_z = -zstride;
			break;
		case ROTATE_270:
			i_start  = zstride * (sz - 1);
			i_step_x = -zstride;
			i_step_z = xstride;
			SWAP(s16, sx, sz);
			break;
		default:
			i_start  = 0;
			i_step_x = xstride;
			i_step_z = zstride;
	}

	s16 y_map = p.Y;
	for (s16 y = 0; y != sy; y++) {
		if ((slice_probs[y] != MTSCHEM_PROB_ALWAYS) &&
			(slice_probs[y] <= myrand_range(1, MTSCHEM_PROB_ALWAYS)))
			continue;

		for (s16 z = 0; z != sz; z++) {
			u32 i = z * i_step_z + y * ystride + i_start;
			for (s16 x = 0; x != sx; x++, i += i_step_x) {
				u32 vi = vm->m_area.index(p.X + x, y_map, p.Z + z);
				if (!vm->m_area.contains(vi))
					continue;

				if (schemdata[i].getContent() == CONTENT_IGNORE)
					continue;

				u8 placement_prob     = schemdata[i].param1 & MTSCHEM_PROB_MASK;
				bool force_place_node = schemdata[i].param1 & MTSCHEM_FORCE_PLACE;

				if (placement_prob == MTSCHEM_PROB_NEVER)
					continue;

				if (!force_place && !force_place_node) {
					content_t c = vm->m_data[vi].getContent();
					if (c != CONTENT_AIR && c != CONTENT_IGNORE)
						continue;
				}

				if ((placement_prob != MTSCHEM_PROB_ALWAYS) &&
					(placement_prob <= myrand_range(1, MTSCHEM_PROB_ALWAYS)))
					continue;

				vm->m_data[vi] = schemdata[i];
				vm->m_data[vi].param1 = 0;

				if (rot)
					vm->m_data[vi].rotateAlongYAxis(m_ndef, rot);
			}
		}
		y_map++;
	}
}


bool Schematic::placeOnVManip(MMVManip *vm, v3s16 p, u32 flags,
	Rotation rot, bool force_place)
{
	assert(vm != NULL);
	assert(schemdata != NULL);
	sanity_check(m_ndef != NULL);

	//// Determine effective rotation and effective schematic dimensions
	if (rot == ROTATE_RAND)
		rot = (Rotation)myrand_range(ROTATE_0, ROTATE_270);

	v3s16 s = (rot == ROTATE_90 || rot == ROTATE_270) ?
		v3s16(size.Z, size.Y, size.X) : size;

	//// Adjust placement position if necessary
	if (flags & DECO_PLACE_CENTER_X)
		p.X -= (s.X + 1) / 2;
	if (flags & DECO_PLACE_CENTER_Y)
		p.Y -= (s.Y + 1) / 2;
	if (flags & DECO_PLACE_CENTER_Z)
		p.Z -= (s.Z + 1) / 2;

	blitToVManip(vm, p, rot, force_place);

	return vm->m_area.contains(VoxelArea(p, p + s - v3s16(1,1,1)));
}

void Schematic::placeOnMap(ServerMap *map, v3s16 p, u32 flags,
	Rotation rot, bool force_place)
{
	std::map<v3s16, MapBlock *> lighting_modified_blocks;
	std::map<v3s16, MapBlock *> modified_blocks;
	std::map<v3s16, MapBlock *>::iterator it;

	assert(map != NULL);
	assert(schemdata != NULL);
	sanity_check(m_ndef != NULL);

	//// Determine effective rotation and effective schematic dimensions
	if (rot == ROTATE_RAND)
		rot = (Rotation)myrand_range(ROTATE_0, ROTATE_270);

	v3s16 s = (rot == ROTATE_90 || rot == ROTATE_270) ?
			v3s16(size.Z, size.Y, size.X) : size;

	//// Adjust placement position if necessary
	if (flags & DECO_PLACE_CENTER_X)
		p.X -= (s.X + 1) / 2;
	if (flags & DECO_PLACE_CENTER_Y)
		p.Y -= (s.Y + 1) / 2;
	if (flags & DECO_PLACE_CENTER_Z)
		p.Z -= (s.Z + 1) / 2;

	//// Create VManip for effected area, emerge our area, modify area
	//// inside VManip, then blit back.
	v3s16 bp1 = getNodeBlockPos(p);
	v3s16 bp2 = getNodeBlockPos(p + s - v3s16(1,1,1));

	MMVManip vm(map);
	vm.initialEmerge(bp1, bp2);

	blitToVManip(&vm, p, rot, force_place);

	voxalgo::blit_back_with_light(map, &vm, &modified_blocks);

	//// Carry out post-map-modification actions

	//// Create & dispatch map modification events to observers
	MapEditEvent event;
	event.type = MEET_OTHER;
	for (it = modified_blocks.begin(); it != modified_blocks.end(); ++it)
		event.modified_blocks.insert(it->first);

	map->dispatchEvent(&event);
}


bool Schematic::deserializeFromMts(std::istream *is,
	std::vector<std::string> *names)
{
	std::istream &ss = *is;
	content_t cignore = CONTENT_IGNORE;
	bool have_cignore = false;

	//// Read signature
	u32 signature = readU32(ss);
	if (signature != MTSCHEM_FILE_SIGNATURE) {
		errorstream << __FUNCTION__ << ": invalid schematic "
			"file" << std::endl;
		return false;
	}

	//// Read version
	u16 version = readU16(ss);
	if (version > MTSCHEM_FILE_VER_HIGHEST_READ) {
		errorstream << __FUNCTION__ << ": unsupported schematic "
			"file version" << std::endl;
		return false;
	}

	//// Read size
	size = readV3S16(ss);

	//// Read Y-slice probability values
	delete []slice_probs;
	slice_probs = new u8[size.Y];
	for (int y = 0; y != size.Y; y++)
		slice_probs[y] = (version >= 3) ? readU8(ss) : MTSCHEM_PROB_ALWAYS_OLD;

	//// Read node names
	u16 nidmapcount = readU16(ss);
	for (int i = 0; i != nidmapcount; i++) {
		std::string name = deSerializeString(ss);

		// Instances of "ignore" from v1 are converted to air (and instances
		// are fixed to have MTSCHEM_PROB_NEVER later on).
		if (name == "ignore") {
			name = "air";
			cignore = i;
			have_cignore = true;
		}

		names->push_back(name);