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use bevy::{
ecs::system::SystemState,
prelude::{AncestorIter, Entity, Parent, Query, World},
};
use serde::{Deserialize, Serialize};
use strum::AsRefStr;
use uuid::Uuid;
use crate::{components::DirworldEntity, resources::DirworldCurrentDir};
/// Conditions which can be checked in lua and yarnspinner scripts
#[derive(Serialize, Deserialize, AsRefStr, Debug, Default, Clone, PartialEq, Eq)]
pub enum Condition {
/// Always true
#[default]
#[strum(serialize = "Always True")]
True,
/// True if `child` is a child of `parent`
#[strum(serialize = "Child Of")]
ChildOf {
/// Entity that must be child
child: Uuid,
/// Entity that must be parent
parent: Uuid,
},
/// True if `parent` is the parent of `child`
#[strum(serialize = "Parent Of")]
ParentOf {
/// Entity that must be parent
parent: Uuid,
/// Entity that must be child
child: Uuid,
},
/// True if `descendant` is a descendant of `ancestor`
#[strum(serialize = "Descendant Of")]
DescendantOf {
/// Entity that must be descendant
descendant: Uuid,
/// Entity that must be ancestor
ancestor: Uuid,
},
/// True if `ancestor` is an ancestor of `descendant`
#[strum(serialize = "Ancestor Of")]
AncestorOf {
/// Entity that must be ancestor
ancestor: Uuid,
/// Entity that must be descendant
descendant: Uuid,
},
/// True if current room matches provided id
#[strum(serialize = "In Room")]
InRoom(Uuid),
/// True if an object with the provided id is in the current room
#[strum(serialize = "Object In Room")]
ObjectInRoom(Uuid),
}
impl Condition {
/// Evaluate the condition and return the result
pub fn evaluate(&self, world: &mut World) -> bool {
match self {
Condition::True => true,
Condition::ChildOf { child, parent } => parent_of(world, *parent, *child),
Condition::ParentOf { parent, child } => parent_of(world, *parent, *child),
Condition::DescendantOf {
descendant,
ancestor,
} => ancestor_of(world, *ancestor, *descendant),
Condition::AncestorOf {
ancestor,
descendant,
} => ancestor_of(world, *ancestor, *descendant),
Condition::InRoom(uuid) => in_room(world, *uuid),
Condition::ObjectInRoom(uuid) => object_in_room(world, *uuid),
}
}
/// Get the name of the condition's corresponding function for lua/yarnspinner APIs
pub fn get_api_function_name(&self) -> &'static str {
match self {
Condition::True => "conditional_true",
Condition::ChildOf { .. } => "conditional_child_of",
Condition::ParentOf { .. } => "conditional_parent_of",
Condition::DescendantOf { .. } => "conditional_descendant_of",
Condition::AncestorOf { .. } =>"conditional_ancestor_of",
Condition::InRoom(_) => "conditional_in_room",
Condition::ObjectInRoom(_) => "conditional_object_in_room",
}
}
/// Parses function name and argument strings into the corresponding condition representation
pub fn from_api_function_name_and_args(name: &str, args: &[&str]) -> Option<Self> {
match name {
"conditional_true" => Some(Condition::True),
"conditional_child_of" => {
let Some(child) = args.get(0).and_then(|arg| Uuid::parse_str(arg).ok()) else {
return None;
};
let Some(parent) = args.get(1).and_then(|arg| Uuid::parse_str(arg).ok()) else {
return None;
};
Some(Condition::ChildOf { child, parent })
}
"conditional_parent_of" => {
let Some(child) = args.get(1).and_then(|arg| Uuid::parse_str(arg).ok()) else {
return None;
};
let Some(parent) = args.get(0).and_then(|arg| Uuid::parse_str(arg).ok()) else {
return None;
};
Some(Condition::ParentOf { child, parent })
}
"conditional_descendant_of" => {
let Some(descendant) = args.get(0).and_then(|arg| Uuid::parse_str(arg).ok()) else {
return None;
};
let Some(ancestor) = args.get(1).and_then(|arg| Uuid::parse_str(arg).ok()) else {
return None;
};
Some(Condition::DescendantOf { descendant, ancestor })
}
"conditional_ancestor_of" => {
let Some(descendant) = args.get(1).and_then(|arg| Uuid::parse_str(arg).ok()) else {
return None;
};
let Some(ancestor) = args.get(0).and_then(|arg| Uuid::parse_str(arg).ok()) else {
return None;
};
Some(Condition::AncestorOf { descendant, ancestor })
}
"condtitional_in_room" => {
let Some(room_id) = args.get(0).and_then(|arg| Uuid::parse_str(arg).ok()) else {
return None;
};
Some(Condition::InRoom(room_id))
}
"condtitional_object_in_room" => {
let Some(object_id) = args.get(0).and_then(|arg| Uuid::parse_str(arg).ok()) else {
return None;
};
Some(Condition::ObjectInRoom(object_id))
}
_ => None,
}
}
}
// Condition Checkers beyond this point
fn ancestor_of(world: &mut World, ancestor: Uuid, descendant: Uuid) -> bool {
let mut system_state =
SystemState::<(Query<(Entity, &DirworldEntity)>, Query<&Parent>)>::new(world);
let (dirworld_entities, parents) = system_state.get(world);
let Some((ancestor_entity, _)) = dirworld_entities.iter().find(|(_, entity)| {
entity
.payload
.as_ref()
.is_some_and(|payload| payload.id == ancestor)
}) else {
return false;
};
let Some((descendant_entity, _)) = dirworld_entities.iter().find(|(_, entity)| {
entity
.payload
.as_ref()
.is_some_and(|payload| payload.id == descendant)
}) else {
return false;
};
AncestorIter::new(&parents, descendant_entity)
.find(|descendant| *descendant == ancestor_entity)
.is_some()
}
fn parent_of(world: &mut World, parent: Uuid, child: Uuid) -> bool {
let mut system_state =
SystemState::<(Query<(Entity, &DirworldEntity)>, Query<&Parent>)>::new(world);
let (dirworld_entities, parents) = system_state.get(world);
let Some((parent_entity, _)) = dirworld_entities.iter().find(|(_, entity)| {
entity
.payload
.as_ref()
.is_some_and(|payload| payload.id == parent)
}) else {
return false;
};
let Some((child_entity, _)) = dirworld_entities.iter().find(|(_, entity)| {
entity
.payload
.as_ref()
.is_some_and(|payload| payload.id == child)
}) else {
return false;
};
parents
.get(child_entity)
.is_ok_and(|parent| parent.get() == parent_entity)
}
fn in_room(world: &mut World, room: Uuid) -> bool {
let current_dir = world.resource::<DirworldCurrentDir>();
current_dir.payload.as_ref().is_some_and(|payload| payload.id == room)
}
fn object_in_room(world: &mut World, object: Uuid) -> bool {
let mut dirworld_entities = world.query::<&DirworldEntity>();
dirworld_entities
.iter(world)
.find(|entity| {
entity
.payload
.as_ref()
.is_some_and(|payload| payload.id == object)
})
.is_some()
}
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