/*
 * Portions of this file are copyright Rebirth contributors and licensed as
 * described in COPYING.txt.
 * Portions of this file are copyright Parallax Software and licensed
 * according to the Parallax license below.
 * See COPYING.txt for license details.

THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
SOFTWARE CORPORATION ("PARALLAX").  PARALLAX, IN DISTRIBUTING THE CODE TO
END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
IN USING, DISPLAYING,  AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
FREE PURPOSES.  IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES.  THE END-USER UNDERSTANDS
AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
COPYRIGHT 1993-1999 PARALLAX SOFTWARE CORPORATION.  ALL RIGHTS RESERVED.
*/

/*
 *
 * Routines for paging in/out textures.
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>

#include "pstypes.h"
#include "inferno.h"
#include "segment.h"
#include "textures.h"
#include "wall.h"
#include "object.h"
#include "console.h"
#include "game.h"
#include "piggy.h"
#include "texmerge.h"
#include "paging.h"
#include "robot.h"
#include "vclip.h"
#include "effects.h"
#include "fireball.h"
#include "weapon.h"
#include "palette.h"
#include "text.h"
#include "gauges.h"
#include "powerup.h"
#include "fuelcen.h"
#include "ai.h"

#include "compiler-range_for.h"
#include "d_levelstate.h"
#include "partial_range.h"
#include "segiter.h"

namespace {

static void paging_touch_vclip(const vclip &vc, const unsigned line
#if DXX_HAVE_CXX_BUILTIN_FILE_LINE
							   = __builtin_LINE()
#else
							   = 0
#endif
							   )
{
	using range_type = partial_range_t<const bitmap_index*>;
	union {
		uint8_t storage[1];
		range_type r;
	} u{};
	try
	{
		new(&u.r) range_type(partial_const_range<partial_range_detail::required_buffer_size<sizeof(__FILE__), sizeof("vc.frames")>>(__FILE__, line, "vc.frames", vc.frames, vc.num_frames));
		static_assert(std::is_trivially_destructible<range_type>::value, "partial_range destructor not called");
	}
	catch (const range_type::partial_range_error &e)
	{
		const auto w = e.what();
		con_puts(CON_URGENT, {w, strlen(w)});
		return;
	}
	range_for (auto &i, u.r)
	{
		PIGGY_PAGE_IN(i);
	}
}

static void paging_touch_vclip(const d_vclip_array &Vclip, const vclip_index vclip_id, const unsigned line
#if DXX_HAVE_CXX_BUILTIN_FILE_LINE
							   = __builtin_LINE()
#else
							   = 0
#endif
							   )
{
	if (Vclip.valid_index(vclip_id))
		paging_touch_vclip(Vclip[vclip_id], line);
}

static void paging_touch_vclip(const d_eclip_array &Effects, const effect_index eclip_id, const unsigned line
#if DXX_HAVE_CXX_BUILTIN_FILE_LINE
							   = __builtin_LINE()
#else
							   = 0
#endif
							   )
{
	if (const auto opt_eid{Effects.valid_index(eclip_id)})
		paging_touch_vclip(Effects[*opt_eid].vc, line);
}

static void paging_touch_wall_effects(const d_eclip_array &Effects, const Textures_array &Textures, const d_vclip_array &Vclip, const int tmap_num)
{
	range_for (auto &i, partial_const_range(Effects, Num_effects))
	{
		if ( i.changing_wall_texture == tmap_num )	{
			paging_touch_vclip(i.vc);

			if (i.dest_bm_num < Textures.size())
				PIGGY_PAGE_IN( Textures[i.dest_bm_num] );	//use this bitmap when monitor destroyed
			paging_touch_vclip(Vclip, i.dest_vclip);		  //what vclip to play when exploding
			paging_touch_vclip(Effects, i.dest_eclip); //what eclip to play when exploding
			paging_touch_vclip(Effects, i.crit_clip); //what eclip to play when mine critical
			break;
		}
	}
}

static void paging_touch_object_effects(const d_eclip_array &Effects, const object_bitmap_index tmap_num)
{
	range_for (auto &i, partial_const_range(Effects, Num_effects))
	{
		if (i.changing_object_texture.dsx == tmap_num) {
			paging_touch_vclip(i.vc);
			break;
		}
	}
}

static void paging_touch_model(const polygon_model_index modelnum)
{
	auto &Effects = LevelUniqueEffectsClipState.Effects;
	auto &Polygon_models = LevelSharedPolygonModelState.Polygon_models;
	const auto &pm = Polygon_models[modelnum];
	const uint_fast32_t b = pm.first_texture;
	const uint_fast32_t e = b + pm.n_textures;
	range_for (const auto p, partial_range(ObjBitmapPtrs, b, e))
	{
		PIGGY_PAGE_IN(ObjBitmaps[p]);
		paging_touch_object_effects(Effects, p);
	}
}

static void paging_touch_weapon(const d_vclip_array &Vclip, const weapon_info &weapon)
{
	// Page in the robot's weapons.

	if (weapon.picture != bitmap_index{})
	{
		PIGGY_PAGE_IN(weapon.picture);
	}		
	
	paging_touch_vclip(Vclip, weapon.flash_vclip);
	paging_touch_vclip(Vclip, weapon.wall_hit_vclip);
	if (weapon.damage_radius)
	{
		// Robot_hit_vclips are actually badass_vclips
		paging_touch_vclip(Vclip, weapon.robot_hit_vclip);
	}

	switch(weapon.render)
	{
	case weapon_info::render_type::vclip:
		paging_touch_vclip(Vclip, weapon.weapon_vclip);
		break;
	case weapon_info::render_type::None:
	case weapon_info::render_type::laser:
		break;
	case weapon_info::render_type::polymodel:
		paging_touch_model(weapon.model_num);
		break;
	case weapon_info::render_type::blob:
		PIGGY_PAGE_IN(weapon.bitmap);
		break;
	}
}

static void paging_touch_weapon(const d_vclip_array &Vclip, const weapon_info_array &Weapon_info, const weapon_id_type weapon_type)
{
	if (weapon_type < N_weapon_types) [[likely]]
		paging_touch_weapon(Vclip, Weapon_info[weapon_type]);
}

const std::array<robot_id, 13> super_boss_gate_type_list{{
	robot_id{0},
	robot_id{1},
	robot_id{8},
	robot_id{9},
	robot_id{10},
	robot_id{11},
	robot_id{12},
	robot_id{15},
	robot_id{16},
	robot_id{18},
	robot_id{19},
	robot_id{20},
	robot_id{22},
}};

static void paging_touch_robot(const d_robot_info_array &Robot_info, const d_vclip_array &Vclip, const weapon_info_array &Weapon_info, const robot_id ridx)
{
	auto &ri = Robot_info[ridx];
	// Page in robot_index
	paging_touch_model(ri.model_num);
	paging_touch_vclip(Vclip, ri.exp1_vclip_num);
	paging_touch_vclip(Vclip, ri.exp2_vclip_num);

	// Page in his weapons
	paging_touch_weapon(Vclip, Weapon_info, ri.weapon_type);

	// A super-boss can gate in robots...
	if (ri.boss_flag == boss_robot_id::d1_superboss)
	{
		range_for (const auto i, super_boss_gate_type_list)
			paging_touch_robot(Robot_info, Vclip, Weapon_info, i);
		paging_touch_vclip(Vclip[vclip_index::morphing_robot]);
	}
}

static void paging_touch_object(const d_robot_info_array &Robot_info, const Textures_array &Textures, const d_vclip_array &Vclip, const weapon_info_array &Weapon_info, const object_base &obj)
{
	switch (obj.render_type) {

		case render_type::RT_NONE:	break;		//doesn't render, like the player

		case render_type::RT_POLYOBJ:
			if (const auto tmap_override{obj.rtype.pobj_info.tmap_override}; tmap_override != texture_index{UINT16_MAX})
			{
				if (tmap_override < Textures.size()) [[likely]]
					PIGGY_PAGE_IN(Textures[tmap_override]);
			}
			else
				paging_touch_model(obj.rtype.pobj_info.model_num.dsx);
			break;

		case render_type::RT_POWERUP:
			paging_touch_vclip(Vclip, obj.rtype.vclip_info.vclip_num);
			break;

		case render_type::RT_MORPH:	break;

		case render_type::RT_FIREBALL: break;

		case render_type::RT_WEAPON_VCLIP: break;

		case render_type::RT_HOSTAGE:
			paging_touch_vclip(Vclip[obj.rtype.vclip_info.vclip_num]);
			break;

		case render_type::RT_LASER: break;
 	}

	switch (obj.type) {	
		default:
			break;
	case object_type::OBJ_PLAYER:	
		paging_touch_vclip(Vclip, get_explosion_vclip(LevelSharedRobotInfoState.Robot_info, obj, explosion_vclip_stage::s0));
		break;
	case object_type::OBJ_ROBOT:
		paging_touch_robot(Robot_info, Vclip, Weapon_info, get_robot_id(obj));
		break;
	case object_type::OBJ_CNTRLCEN:
		paging_touch_weapon(Vclip, Weapon_info, weapon_id_type::CONTROLCEN_WEAPON_NUM);
		if (const auto m = Dead_modelnums[obj.rtype.pobj_info.model_num.dsx]; m != polygon_model_index::None)
			paging_touch_model(m);
		break;
	}
}

static void paging_touch_side(const d_eclip_array &Effects, const Textures_array &Textures, const d_vclip_array &Vclip, const cscusegment segp, const sidenum_t sidenum)
{
	auto &Walls = LevelUniqueWallSubsystemState.Walls;
	auto &vcwallptr = Walls.vcptr;
	if (!(WALL_IS_DOORWAY(GameBitmaps, Textures, vcwallptr, segp, sidenum) & WALL_IS_DOORWAY_FLAG::render))
		return;
	auto &uside = segp.u.sides[sidenum];
	const auto tmap1 = uside.tmap_num;
	paging_touch_wall_effects(Effects, Textures, Vclip, get_texture_index(tmap1));
	if (const auto tmap2 = uside.tmap_num2; tmap2 != texture2_value::None)
	{
		paging_touch_wall_effects(Effects, Textures, Vclip, get_texture_index(tmap2));
	} else	{
		if (const auto ti{get_texture_index(tmap1)}; ti < Textures.size()) [[likely]]
			PIGGY_PAGE_IN(Textures[ti]);
	}
}

static void paging_touch_robot_maker(const d_robot_info_array &Robot_info, const d_vclip_array &Vclip, const weapon_info_array &Weapon_info, const shared_segment &segp)
{
	auto &RobotCenters = LevelSharedRobotcenterState.RobotCenters;
	paging_touch_vclip(Vclip[vclip_index::morphing_robot]);
			const auto &robot_flags = RobotCenters[segp.matcen_num].robot_flags;
			constexpr std::size_t bits_per_robot_flags = 8 * sizeof(robot_flags[0]);
			for (uint_fast32_t i = 0; i != robot_flags.size(); ++i)
			{
				uint8_t robot_index = i * bits_per_robot_flags;
				/* As an optimization, if uint_fast32_t can represent two
				 * elements of robot_flags[] and a second element exists, then
				 * merge in the second element, so that the inner while loop
				 * can handle two elements of robot_flags[] at a time.
				 */
				uint_fast32_t flags = robot_flags[i];
				if constexpr (sizeof(flags) >= 2 * sizeof(robot_flags[0]))
				{
					if (i + 1 != robot_flags.size())
						flags |= static_cast<uint64_t>(robot_flags[++i]) << bits_per_robot_flags;
				}
				while (flags) {
					if (flags & 1)	{
						// Page in robot_index
						paging_touch_robot(Robot_info, Vclip, Weapon_info, robot_id{robot_index});
					}
					flags >>= 1;
					robot_index++;
				}
			}
}

static void paging_touch_segment(const d_eclip_array &Effects, const d_robot_info_array &Robot_info, const Textures_array &Textures, const d_vclip_array &Vclip, const weapon_info_array &Weapon_info, const fvcobjptridx &vcobjptridx, const fvcsegptr &vcsegptr, const cscusegment segp)
{
	if (segp.s.special == segment_special::robotmaker)
		paging_touch_robot_maker(Robot_info, Vclip, Weapon_info, segp);

	for (const auto sn : MAX_SIDES_PER_SEGMENT)
	{
		paging_touch_side(Effects, Textures, Vclip, segp, sn);
	}

	for (auto &objp : objects_in<const object_base>(segp, vcobjptridx, vcsegptr))
		paging_touch_object(Robot_info, Textures, Vclip, Weapon_info, objp);
}

static void paging_touch_walls(const Textures_array &Textures, const wall_animations_array &WallAnims, const fvcwallptr &vcwallptr)
{
	for (auto &w : vcwallptr)
	{
		if (w.clip_num > -1)
		{
			const auto &anim = WallAnims[w.clip_num];
			range_for (auto &j, partial_range(anim.frames, anim.num_frames))
			{
				if (j >= Textures.size()) [[unlikely]]
					continue;
				PIGGY_PAGE_IN(Textures[j]);
			}
		}
	}
}
}

namespace dsx {
void paging_touch_all(const d_vclip_array &Vclip)
{
	auto &Effects = LevelUniqueEffectsClipState.Effects;
	auto &Objects = LevelUniqueObjectState.Objects;
	auto &WallAnims = GameSharedState.WallAnims;
	auto &vcobjptridx = Objects.vcptridx;
	pause_game_world_time p;

#if DXX_BUILD_DESCENT == 1
	gr_set_default_canvas();
	show_boxed_message(*grd_curcanv, TXT_LOADING);
	gr_flip();
#endif
	auto &Robot_info = LevelSharedRobotInfoState.Robot_info;
	for (const cscusegment segp : vcsegptr)
	{
		paging_touch_segment(Effects, Robot_info, Textures, Vclip, Weapon_info, vcobjptridx, vcsegptr, segp);
	}	
	auto &Walls = LevelUniqueWallSubsystemState.Walls;
	auto &vcwallptr = Walls.vcptr;
	paging_touch_walls(Textures, WallAnims, vcwallptr);

	range_for (auto &s, partial_const_range(Powerup_info, N_powerup_types))
		paging_touch_vclip(Vclip, s.vclip_num);

	range_for (auto &w, partial_const_range(Weapon_info, N_weapon_types))
	{
		paging_touch_weapon(Vclip, w);
	}

	range_for (auto &s, partial_const_range(Powerup_info, N_powerup_types))
		paging_touch_vclip(Vclip, s.vclip_num);

	range_for (auto &s, Gauges)
	{
		if (s != bitmap_index{})
			PIGGY_PAGE_IN( s );
	}
	paging_touch_vclip(Vclip[vclip_index::player_appearance]);
	paging_touch_vclip(Vclip[vclip_index::powerup_disappearance]);

	reset_cockpit();		//force cockpit redraw next time
}
}
