using System.Text.RegularExpressions;
using BspImport.Decompiler.Formats.Readers;

namespace BspImport.Decompiler.Formats.Descriptors;

/// <summary>
/// Left 4 Dead 2 BSP descriptor.
/// Uses version-first lump header layout.
/// </summary>
public sealed class Left4Dead2BspFormatDescriptor : IBspFormatDescriptor
{
	private static readonly Regex MapNameRegex = new(@"^c\d+m\d+_",
		RegexOptions.IgnoreCase | RegexOptions.Compiled | RegexOptions.CultureInvariant );

	private static readonly IBspStructReaders _readers = new StandardBspStructReaders();

	private static readonly HashSet<string> Signatures = new( StringComparer.OrdinalIgnoreCase )
	{
		"ambient_music",
		"commentary_zombie_spawner",
		"env_airstrike_indoors",
		"env_outtro_stats",
		"env_player_blocker",
		"env_rock_launcher",
		"env_tonemap_controller_ghost",
		"env_tonemap_controller_infected",
		"env_weaponfire",
		"filter_activator_infected_class",
		"filter_health",
		"filter_melee_damage",
		"func_block_charge",
		"func_button_timed",
		"func_elevator",
		"func_extinguisher",
		"func_nav_attribute_region",
		"func_nav_avoidance_obstacle",
		"func_nav_blocker",
		"func_nav_connection_blocker",
		"func_orator",
		"func_playerinfected_clip",
		"func_ragdoll_fader",
		"game_scavenge_progress_display",
		"info_ambient_mob",
		"info_ambient_mob_end",
		"info_ambient_mob_start",
		"info_director",
		"info_elevator_floor",
		"info_goal_infected_chase",
		"info_item_position",
		"info_l4d1_survivor_spawn",
		"info_map_parameters_versus",
		"info_remarkable",
		"info_survivor_position",
		"info_survivor_rescue",
		"info_zombie_border",
		"info_zombie_spawn",
		"logic_director_query",
		"logic_game_event",
		"logic_versus_random",
		"point_deathfall_camera",
		"point_prop_use_target",
		"point_viewcontrol_survivor",
		"prop_car_alarm",
		"prop_car_glass",
		"prop_door_rotating_checkpoint",
		"prop_fuel_barrel",
		"prop_health_cabinet",
		"prop_minigun",
		"prop_minigun_l4d1",
		"prop_mounted_machine_gun",
		"prop_wall_breakable",
		"trigger_active_weapon_detect",
		"trigger_auto_crouch",
		"trigger_escape",
		"trigger_finale",
		"trigger_hurt_ghost",
		"trigger_upgrade_laser_sight",
		"upgrade_spawn",
		"weapon_adrenaline_spawn",
		"weapon_ammo_spawn",
		"weapon_autoshotgun_spawn",
		"weapon_chainsaw_spawn",
		"weapon_defibrillator_spawn",
		"weapon_first_aid_kit_spawn",
		"weapon_gascan_spawn",
		"weapon_grenade_launcher_spawn",
		"weapon_hunting_rifle_spawn",
		"weapon_item_spawn",
		"weapon_melee_spawn",
		"weapon_molotov_spawn",
		"weapon_pain_pills_spawn",
		"weapon_pipe_bomb_spawn",
		"weapon_pistol_magnum_spawn",
		"weapon_pistol_spawn",
		"weapon_pumpshotgun_spawn",
		"weapon_rifle_ak47_spawn",
		"weapon_rifle_desert_spawn",
		"weapon_rifle_m60_spawn",
		"weapon_rifle_spawn",
		"weapon_scavenge_item_spawn",
		"weapon_shotgun_chrome_spawn",
		"weapon_shotgun_spas_spawn",
		"weapon_smg_silenced_spawn",
		"weapon_smg_spawn",
		"weapon_sniper_military_spawn",
		"weapon_spawn",
		"weapon_upgradepack_explosive_spawn",
		"weapon_upgradepack_incendiary_spawn",
		"weapon_vomitjar_spawn"
	};

	public BspGameFormat GameFormat => BspGameFormat.Left4Dead2;
	public IReadOnlySet<int> SupportedVersions { get; } = new HashSet<int> { 21 };
	public string DisplayName => "Left 4 Dead 2";
	public int SpecificityScore => 100;

	public LumpHeaderLayout LumpHeaderLayout => LumpHeaderLayout.VersionFirst;
	public BrushSideLayout BrushSideLayout => BrushSideLayout.Standard;
	public StaticPropLayout StaticPropLayout => StaticPropLayout.V8;

	public IBspStructReaders GetStructReaders( int bspVersion ) => _readers;

	public bool MatchesMapName( string mapName )
	{
		return !string.IsNullOrEmpty( mapName ) &&
		       (mapName.StartsWith( "tutorial_", StringComparison.OrdinalIgnoreCase ) ||
		        MapNameRegex.IsMatch( mapName ));
	}

	public bool MatchesEntities( IReadOnlyList<string> entityClassNames )
	{
		return Signatures.Overlaps( entityClassNames );
	}
}