/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef AGS_ENGINE_AC_GAME_STATE_H
#define AGS_ENGINE_AC_GAME_STATE_H

#include "common/std/memory.h"
#include "common/std/unordered_set.h"
#include "common/std/vector.h"
#include "ags/shared/ac/character_info.h"
#include "ags/shared/ac/keycode.h"
#include "ags/engine/ac/runtime_defines.h"
#include "ags/engine/ac/speech.h"
#include "ags/engine/ac/timer.h"
#include "ags/shared/game/room_struct.h"
#include "ags/engine/game/viewport.h"
#include "ags/engine/gfx/graphics_driver.h"
#include "ags/engine/media/audio/queued_audio_item.h"
#include "ags/shared/util/geometry.h"
#include "ags/shared/util/string_types.h"
#include "ags/shared/util/string.h"

namespace AGS3 {

// Forward declaration
namespace AGS {
namespace Shared {
class Bitmap;
class Stream;
typedef std::shared_ptr<Bitmap> PBitmap;
} // namespace Shared

namespace Engine {
struct RestoredData;
} // namespace Engine
} // namespace AGS

using namespace AGS; // FIXME later
struct ScriptViewport;
struct ScriptCamera;
struct ScriptOverlay;

#define MAX_GAME_STATE_NAME_LENGTH 100
#define GAME_STATE_RESERVED_INTS 5
#define LEGACY_GAMESTATE_GAMENAMELENGTH 100
// This is a length limit for serialized field,
// not actual api input argument
#define PLAYMP3FILE_MAX_FILENAME_LEN 50

// Savegame data format
enum GameStateSvgVersion {
	kGSSvgVersion_OldFormat = -1, // TODO: remove after old save support is dropped
	kGSSvgVersion_Initial = 0,
	kGSSvgVersion_350 = 1,
	kGSSvgVersion_350_9 = 2,
	kGSSvgVersion_350_10 = 3,
	kGSSvgVersion_361_14 = 4,
};


// Runtime game state
struct GameState {
	// WARNING: following is a part of the script and plugin API
	// (until further notice)
	int  score = 0;      // player's current score
	int  usedmode = 0;   // set by ProcessClick to last cursor mode used
	int  disabled_user_interface = 0;  // >0 while in cutscene/etc
	int  gscript_timer = 0;    // obsolete
	int  debug_mode = 0;       // whether we're in debug mode
	int32_t globalvars[MAXGLOBALVARS]{};  // obsolete
	int  messagetime = 0;      // time left for auto-remove messages
	int  usedinv = 0;          // inventory item last used
	// Following inv_* variables are legacy variables controlling
	// the single player's inventory (used prior to supporting custom InvWindow controls).
	int  inv_top = 0;       // topmost index of displayed player's inventory
	int  inv_numdisp = 0;   // number of player's items displayed at once
	int  inv_numorder = 0;  // total number of player's items
	int  inv_numinline = 0; // number of items displayed on a single inventory row
	int  text_speed = 0;       // how quickly text is removed
	int  sierra_inv_color = 0; // background used to paint defualt inv window
	int  talkanim_speed = 0;   // animation speed of talking anims
	int  inv_item_wid = 0;
	int  inv_item_hit = 0;  // set by SetInvDimensions
	int  speech_text_shadow = 0;         // colour of outline fonts (default black)
	int  swap_portrait_side = 0;         // sierra-style speech swap sides
	int  speech_textwindow_gui = 0;      // textwindow used for sierra-style speech
	int  follow_change_room_timer = 0;   // delay before moving following characters into new room
	int  totalscore = 0;           // maximum possible score
	int  skip_display = 0;         // how the user can skip normal Display windows
	int  no_multiloop_repeat = 0;  // for backwards compatibility
	int  roomscript_finished = 0;  // on_call finished in room
	int  used_inv_on = 0;          // inv item they clicked on
	int  no_textbg_when_voice = 0; // no textwindow bgrnd when voice speech is used
	int  max_dialogoption_width = 0; // max width of dialog options text window
	int  no_hicolor_fadein = 0;      // fade out but instant in for hi-color
	int  bgspeech_game_speed = 0;    // is background speech relative to game speed
	int  bgspeech_stay_on_display = 0; // whether to remove bg speech when DisplaySpeech is used
	int  unfactor_speech_from_textlength = 0; // remove "&10" when calculating time for text to stay
	int  mp3_loop_before_end = 0;    // (UNUSED!) loop this time before end of track (ms)
	int  speech_music_drop = 0;      // how much to drop music volume by when speech is played
	int  in_cutscene = 0;            // we are between a StartCutscene and EndCutscene
	int  fast_forward = 0;           // player has elected to skip cutscene
	int  room_width = 0;      // width of current room
	int  room_height = 0;     // height of current room
	// ** end of the part exposed to plugin API (script API continues)

	int  game_speed_modifier = 0;
	int  score_sound = 0;
	int  takeover_data = 0;  // value passed to RunAGSGame in previous game
	int  replay_hotkey_unused = 0;  // (UNUSED!) StartRecording: not supported
	int  dialog_options_x = 0;
	int  dialog_options_y = 0;
	int  narrator_speech = 0;
	int  ambient_sounds_persist = 0;
	int  lipsync_speed = 0;
	int  close_mouth_speech_time = 0; // stop speech animation at (messagetime - close_mouth_speech_time)
	// (this is designed to work in text-only mode)
	int  disable_antialiasing = 0;
	int  text_speed_modifier = 0;
	HorAlignment text_align = kHAlignNone;
	int  speech_bubble_width = 0;
	int  min_dialogoption_width = 0;
	int  disable_dialog_parser = 0;
	int  anim_background_speed = 0;  // the setting for this room
	int  top_bar_backcolor = 0;
	int  top_bar_textcolor = 0;
	int  top_bar_bordercolor = 0;
	int  top_bar_borderwidth = 0;
	int  top_bar_ypos = 0;
	int  screenshot_width = 0;
	int  screenshot_height = 0;
	int  top_bar_font = 0;
	HorAlignment speech_text_align = kHAlignNone;
	int  auto_use_walkto_points = 0;
	int  inventory_greys_out = 0;
	int  skip_speech_specific_key = 0;
	int  abort_key = 0;
	int  fade_to_red = 0;
	int  fade_to_green = 0;
	int  fade_to_blue = 0;
	int  show_single_dialog_option = 0;
	int  keep_screen_during_instant_transition = 0;
	int  read_dialog_option_colour = 0;
	int  stop_dialog_at_end = 0;
	int  speech_portrait_placement = 0; // speech portrait placement mode (automatic/custom)
	int  speech_portrait_x = 0; // a speech portrait x offset from corresponding screen side
	int  speech_portrait_y = 0; // a speech portrait y offset
	int  speech_display_post_time_ms = 0; // keep speech text/portrait on screen after text/voice has finished playing = 0;
	// no speech animation is supposed to be played at this time
	int  dialog_options_highlight_color = 0; // The colour used for highlighted (hovered over) text in dialog options
	int32_t reserved[GAME_STATE_RESERVED_INTS]{};  // make sure if a future version adds a var, it doesn't mess anything up
	// ** end of the part exposed to script API
	//

	long  randseed = 0;    // random seed
	int   player_on_region = 0;    // player's current region
	int   screen_is_faded_out = 0; // the screen is currently black
	int   check_interaction_only = 0;
	int   bg_frame = 0, bg_anim_delay = 0;  // for animating backgrounds
	int   music_vol_was = 0;  // before the volume drop
	short wait_counter = 0;
	int8  wait_skipped_by = 0; // tells how last blocking wait was skipped [not serialized]
	int   wait_skipped_by_data = 0; // extended data telling how last blocking wait was skipped [not serialized]
	short mboundx1 = 0;
	short mboundx2 = 0;
	short mboundy1 = 0;
	short mboundy2 = 0;
	int   fade_effect = 0;
	int   bg_frame_locked = 0;
	int32_t globalscriptvars[MAXGSVALUES]{};
	int   cur_music_number = 0;
	int   music_repeat = 0;
	int   music_master_volume = 0;
	int   digital_master_volume = 0;
	char  walkable_areas_on[MAX_WALK_AREAS]{};
	short screen_flipped = 0;
	int   entered_at_x = 0;
	int   entered_at_y = 0;
	int   entered_edge = 0;
	bool  voice_avail; // whether voice-over is available
	SpeechMode speech_mode; // speech mode (text, voice, or both)
	int   speech_skip_style = 0;
	int32_t   script_timers[MAX_TIMERS]{};
	int   sound_volume = 0;
	int   speech_volume = 0;
	int   normal_font = 0;
	int   speech_font = 0;
	int8  key_skip_wait = 0;
	int   swap_portrait_lastchar = 0;
	int   swap_portrait_lastlastchar = 0;
	bool  separate_music_lib = false;
	int   in_conversation = 0;
	int   screen_tint = 0;
	int   num_parsed_words = 0;
	short parsed_words[MAX_PARSED_WORDS]{};
	char  bad_parsed_word[100]{};
	int   raw_color = 0;
	int32_t raw_modified[MAX_ROOM_BGFRAMES]{};
	Shared::PBitmap raw_drawing_surface = 0;
	short filenumbers[MAXSAVEGAMES]{};
	int   room_changes = 0;
	int   mouse_cursor_hidden = 0;
	int   silent_midi = 0;
	int   silent_midi_channel = 0;
	int   current_music_repeating = 0;  // remember what the loop flag was when this music started
	unsigned long shakesc_delay = 0;  // unsigned long to match _G(loopcounter)
	int   shakesc_amount = 0;
	int   shakesc_length = 0;
	int   rtint_red = 0;
	int   rtint_green = 0;
	int   rtint_blue = 0;
	int   rtint_level = 0;
	int   rtint_light = 0;
	bool  rtint_enabled = false;
	int   end_cutscene_music = 0;
	int   skip_until_char_stops = 0;
	int   get_loc_name_last_time = 0;
	int   get_loc_name_save_cursor = 0;
	int   restore_cursor_mode_to = 0;
	int   restore_cursor_image_to = 0;
	short music_queue_size = 0;
	short music_queue[MAX_QUEUED_MUSIC]{};
	short new_music_queue_size = 0;
	short crossfading_out_channel = 0;
	short crossfade_step = 0;
	short crossfade_out_volume_per_step = 0;
	short crossfade_initial_volume_out = 0;
	short crossfading_in_channel = 0;
	short crossfade_in_volume_per_step = 0;
	short crossfade_final_volume_in = 0;
	QueuedAudioItem new_music_queue[MAX_QUEUED_MUSIC]{};
	char  takeover_from[50]{};
	// Currently played external file; this is only for reference
	AGS::Shared::String playmp3file_name;
	char  globalstrings[MAXGLOBALSTRINGS][MAX_MAXSTRLEN]{};
	char  lastParserEntry[MAX_MAXSTRLEN]{};
	AGS::Shared::String game_name;
	int   ground_level_areas_disabled = 0;
	int   next_screen_transition = 0;
	int   gamma_adjustment = 0;
	short temporarily_turned_off_character = 0;  // Hide Player Charactr ticked
	short inv_backwards_compatibility = 0;  // tells to use legacy inv_* variables
	std::vector<int> gui_draw_order; // used only for hit detection now
	std::unordered_set<AGS::Shared::String> do_once_tokens;
	int   text_min_display_time_ms = 0;
	int   ignore_user_input_after_text_timeout_ms = 0;
	int32_t default_audio_type_volumes[MAX_AUDIO_TYPES]{};

	// Dynamic custom property values for characters and items
	std::vector<AGS::Shared::StringIMap> charProps;
	AGS::Shared::StringIMap invProps[MAX_INV];

	// Dynamic speech state
	//
	// Tells whether there is a voice-over played during current speech
	bool  speech_has_voice = false;
	// Tells whether the voice was played in blocking mode;
	// atm blocking speech handles itself, and we only need to finalize
	// non-blocking voice speech during game update; speech refactor would be
	// required to get rid of this rule.
	bool  speech_voice_blocking = false;
	// Tells whether character speech stays on screen not animated for additional time
	bool  speech_in_post_state = false;

	// Special overlays
	//
	// Total number of existing overlays, only for the reference
	int overlay_count = 0;
	// Incrementing index of creation, assigned to overlays.
	// Currently is used when resolving sorting conflicts with equal z-order.
	// TODO: this method theoretically can overflow, but was added still as a quick fix;
	// investigate better solutions later.
	int overlay_creation_id = 0;
	// Is there a QFG4-style dialog overlay on screen (contains overlay ID)
	int  complete_overlay_on = 0;
	// Is there a blocking text overlay on screen (contains overlay ID)
	int  text_overlay_on = 0;
	// Script overlay handles, because we must return same script objects
	// whenever user script queries for them.
	// Blocking speech overlay managed handle
	int  speech_text_schandle = 0;
	// Speech portrait overlay managed handle
	int  speech_face_schandle = 0;

	 // y offset of the shaking screen
	int shake_screen_yoff = 0;


	GameState();

	//
	// Viewport and camera control.
	// Viewports are positioned in game screen coordinates, related to the "game size",
	// while cameras are positioned in room coordinates.
	//
	// Returns main (game's) viewport position on screen, this is the overall game view
	const Rect &GetMainViewport() const;
	// Returns UI viewport position on screen, within the main viewport
	const Rect &GetUIViewport() const;
	// Returns SpriteTransform corresponding to the global screen offsets
	AGS::Engine::SpriteTransform GetGlobalTransform(bool full_frame_rend) const;
	// Tells if the room viewport should be adjusted automatically each time a new room is loaded
	bool IsAutoRoomViewport() const;
	// Returns Room viewport object by it's main index
	PViewport  GetRoomViewport(int index) const;
	// Returns Room viewport object by index in z-order
	const std::vector<PViewport> &GetRoomViewportsZOrdered() const;
	// Finds room viewport at the given screen coordinates; returns nullptr if non found
	PViewport  GetRoomViewportAt(int x, int y) const;
	// Returns Room viewport position in absolute coordinates (with main viewport offset);
	// this is a helper function, meant for peculiar cases.
	Rect       GetRoomViewportAbs(int index) const;
	// Sets if the room viewport should be adjusted automatically each time a new room is loaded
	void SetAutoRoomViewport(bool on);
	// Main viewport defines the location of all things drawn and interactable on the game screen.
	// Other viewports are defined relative to the main viewports.
	void SetMainViewport(const Rect &viewport);
	// UI viewport is a formal dummy viewport for GUI and Overlays (like speech).
	void SetUIViewport(const Rect &viewport);
	// Applies all the pending changes to viewports and cameras;
	// NOTE: this function may be slow, thus recommended to be called only once
	// and during the main game update.
	void UpdateViewports();
	// Notifies game state that viewports need z-order resorting upon next update.
	void InvalidateViewportZOrder();
	// Returns room camera object chosen by index
	PCamera GetRoomCamera(int index) const;
	// Runs cameras behaviors
	void UpdateRoomCameras();
	// Converts room coordinates to the game screen coordinates through the room viewport
	// This group of functions always tries to pass a point through the **primary** room viewport
	// TODO: also support using arbitrary viewport (for multiple viewports).
	Point RoomToScreen(int roomx, int roomy);
	int  RoomToScreenX(int roomx);
	int  RoomToScreenY(int roomy);
	// Converts game screen coordinates to the room coordinates through the room viewport
	// This pair of functions tries to find if there is any viewport at the given coords.
	// If "clip_viewport" parameter is true, then not finding a viewport results in failure,
	// if it is false, proceeds converting through the primary viewport.
	// TODO: find out if possible to refactor and get rid of "variadic" variants;
	// usually this depends on how the arguments are created (whether they are in "variadic" or true coords)
	VpPoint ScreenToRoom(int scrx, int scry, bool clip_viewport = true);
	VpPoint ScreenToRoomDivDown(int scrx, int scry); // native "variadic" coords variant

	// Makes sure primary viewport and camera are created and linked together
	void CreatePrimaryViewportAndCamera();
	// Creates new room viewport
	PViewport CreateRoomViewport();
	// Register camera in the managed system; optionally links to existing handle
	ScriptViewport *RegisterRoomViewport(int index, int32_t handle = 0);
	// Deletes existing room viewport
	void DeleteRoomViewport(int index);
	// Get number of room viewports
	int GetRoomViewportCount() const;
	// Creates new room camera
	PCamera CreateRoomCamera();
	// Register camera in the managed system; optionally links to existing handle
	ScriptCamera *RegisterRoomCamera(int index, int32_t handle = 0);
	// Deletes existing room camera
	void DeleteRoomCamera(int index);
	// Get number of room cameras
	int GetRoomCameraCount() const;
	// Gets script viewport reference; does NOT increment refcount
	// because script interpreter does this when acquiring managed pointer.
	ScriptViewport *GetScriptViewport(int index);
	// Gets script camera reference; does NOT increment refcount
	// because script interpreter does this when acquiring managed pointer.
	ScriptCamera *GetScriptCamera(int index);

	//
	// User input management
	//
	// Tells if game should ignore user input right now. Note that some of the parent states
	// may not ignore it at the same time, such as cutscene state, which may still be skipped
	// with a key press or a mouse button.
	bool IsIgnoringInput() const;
	// Sets ignore input state, for the given time; if there's one already, chooses max timeout
	void SetIgnoreInput(int timeout_ms);
	// Clears ignore input state
	void ClearIgnoreInput();

	// Set how the last blocking wait was skipped
	void SetWaitSkipResult(int how, int data = 0);
	void SetWaitKeySkip(const KeyInput &kp) {
		SetWaitSkipResult(SKIP_KEYPRESS, AGSKeyToScriptKey(kp.Key) | kp.Mod);
	}
	// Returns the information about how the latest blocking wait was skipped.
	// The information is packed into int32 value like this:
	// | 0xFF       | 0xFF    | 0xF      | 0xFFF                     |
	// | eInputType | eKeyMod | reserved | eKeyCode, MouseButton etc |
	int GetWaitSkipResult() const;

	//
	// Voice speech management
	//
	// Tells if there's a blocking voice speech playing right now
	bool IsBlockingVoiceSpeech() const;
	// Tells whether we have to finalize voice speech when stopping or reusing the channel
	bool IsNonBlockingVoiceSpeech() const;
	// Speech helpers
	bool ShouldPlayVoiceSpeech() const;

	//
	// Serialization
	//
	void ReadCustomProperties_v340(Shared::Stream *in, GameDataVersion data_ver);
	void WriteCustomProperties_v340(Shared::Stream *out, GameDataVersion data_ver) const;
	void ReadFromSavegame(Shared::Stream *in, GameDataVersion data_ver, GameStateSvgVersion svg_ver, AGS::Engine::RestoredData &r_data);
	void WriteForSavegame(Shared::Stream *out) const;
	// This is required for freeing only particular parts when restoring the game;
	// FIXME: investigate and refactor to be able to simply reset whole object
	void FreeProperties();
	void FreeViewportsAndCameras();

private:
	VpPoint ScreenToRoomImpl(int scrx, int scry, int view_index, bool clip_viewport, bool convert_cam_to_data);
	void UpdateRoomCamera(int index);

	// Defines if the room viewport should be adjusted to the room size automatically.
	bool _isAutoRoomViewport = true;
	// Main viewport defines the rectangle of the drawn and interactable area;
	// in the most basic case it will be equal to the game size.
	Rect _mainViewport;
	// UI viewport defines the render and interaction rectangle of game's UI,
	// within the main game viewport.
	Rect _uiViewport;
	// Room viewports define place on screen where the room camera's
	// contents are drawn.
	std::vector<PViewport> _roomViewports;
	// Vector of viewports sorted in z-order.
	std::vector<PViewport> _roomViewportsSorted;
	// Cameras defines the position of a "looking eye" inside the room.
	std::vector<PCamera> _roomCameras;
	// We keep handles to the script refs to viewports and cameras, so that we
	// could address them and invalidate as the actual object gets destroyed.
	std::vector<int32_t> _scViewportHandles;
	std::vector<int32_t> _scCameraHandles;

	// Tells that the main viewport's position has changed since last game update
	bool  _mainViewportHasChanged = false;
	// Tells that room viewports need z-order resort
	bool  _roomViewportZOrderChanged = false;

	AGS_Clock::time_point _ignoreUserInputUntilTime = 0;
};

// Converts legacy alignment type used in script API
HorAlignment ConvertLegacyScriptAlignment(LegacyScriptAlignment align);
// Reads legacy alignment type from the value set in script depending on the
// current Script API level. This is made to make it possible to change
// Alignment constants in the Script API and still support old version.
HorAlignment ReadScriptAlignment(int32_t align);



} // namespace AGS3

#endif