//! `Projectile` type.

use crate::{bin::OptU16, err::*, fixed::{Fixed, Unit}};

use super::damg;

/// Reads a `PRpx` chunk.
pub fn read(b: &[u8]) -> ResultS<(Projectile, usize)>
{
	read_data! {
		endian: BIG, buf: b, size: 48, start: 0, data {
			let collection    = OptU16[0];
			let shape         = u16[2];
			let fxt_explode   = OptU16[4];
			let fxt_exp_media = OptU16[6];
			let fxt_trail     = OptU16[8];
			let tic_trail     = u16[10];
			let max_trail     = OptU16[12];
			let typ_media     = OptU16[14];
			let radius        = Unit[16];
			let dmg_rad       = Unit[18];
			let dmg_def       = damg::read[20; 12];
			let flags         = u32[32] flag ProjectileFlags;
			let speed         = Unit[36];
			let range         = Unit[38];
			let snd_pitch     = Fixed[40];
			let snd_fly       = OptU16[44];
			let snd_bounce    = OptU16[46];
		}
	}

	Ok((Projectile{collection, shape, fxt_explode, fxt_exp_media, fxt_trail,
	               tic_trail, max_trail, typ_media, radius, dmg_rad, dmg_def,
	               flags, speed, range, snd_pitch, snd_fly, snd_bounce}, 48))
}

/// A projectile definition.
#[cfg_attr(feature = "serde_obj", derive(serde::Serialize))]
#[derive(Debug, Eq, PartialEq)]
pub struct Projectile {
	pub collection:    OptU16,
	pub shape:         u16,
	pub fxt_explode:   OptU16,
	pub fxt_exp_media: OptU16,
	pub fxt_trail:     OptU16,
	pub tic_trail:     u16,
	pub max_trail:     OptU16,
	pub typ_media:     OptU16,
	pub radius:        Unit,
	pub dmg_rad:       Unit,
	pub dmg_def:       damg::Damage,
	pub flags:         ProjectileFlags,
	pub speed:         Unit,
	pub range:         Unit,
	pub snd_pitch:     Fixed,
	pub snd_fly:       OptU16,
	pub snd_bounce:    OptU16,
}

c_bitfield! {
	/// Flags for a projectile.
	#[cfg_attr(feature = "serde_obj", derive(serde::Serialize))]
	pub struct ProjectileFlags: u32 {
		GUIDED            = 0,
		STOP_ON_LOOP      = 1,
		PERSISTENT        = 2,
		ALIEN             = 3,
		GRAVITY           = 4,
		NO_HORZ_ERROR     = 5,
		NO_VERT_ERROR     = 6,
		TOGGLE_PANELS     = 7,
		POS_VERT_ERROR    = 8,
		MELEE             = 9,
		RIPPER            = 10,
		PASS_TRANS_RANDOM = 11,
		PASS_TRANS_MORE   = 12,
		DOUBLE_GRAVITY    = 13,
		REBOUND_FLOOR     = 14,
		THROUGH_MEDIA     = 15,
		BECOME_ITEM       = 16,
		BLOODY            = 17,
		WANDER_HORZ       = 18,
		WANDER_VERT       = 19,
		USE_LOW_GRAV      = 20,
		PASS_MEDIA        = 21,
	}
}

// EOF