class_name BossPhase
extends Resource
## One stage of a boss fight: a looping timeline of emitters, entered when the
## boss drops below [member enter_at_hp_fraction].

@export var name: String = "Phase"
## The phase becomes active once hp/max_hp is at or below this. Phases are
## evaluated in array order, so list them from 1.0 downwards.
@export_range(0.0, 1.0, 0.01) var enter_at_hp_fraction: float = 1.0
## The phase timeline wraps at this many ticks. Emitter [member start_tick] and
## [member end_tick] are relative to the start of each loop.
@export var loop_ticks: int = 600
## Ticks of no fire after entering the phase, so the transition is readable.
@export var telegraph_ticks: int = 45
## Damage taken while in this phase is scaled by this. Use < 1.0 for armoured
## phases rather than adding hit points, so the fight length stays predictable.
@export var damage_taken_mult: float = 1.0
@export var emitters: Array[BulletEmitter] = []