veloren/common/src/states/leap_melee.rs

use crate::{
    combat::{Attack, AttackEffect, CombatBuff, DamageComponent},
    comp::{CharacterState, MeleeAttack, PoiseChange, PoiseSource, StateUpdate},
    states::{
        behavior::{CharacterBehavior, JoinData},
        utils::{StageSection, *},
    },
    Damage, DamageSource, GroupTarget, Knockback, KnockbackDir,
};
use serde::{Deserialize, Serialize};
use std::time::Duration;

/// Separated out to condense update portions of character state
#[derive(Copy, Clone, Debug, PartialEq, Serialize, Deserialize)]
pub struct StaticData {
    /// How long the state is moving
    pub movement_duration: Duration,
    /// How long until state should deal damage
    pub buildup_duration: Duration,
    /// How long the weapon swings
    pub swing_duration: Duration,
    /// How long the state has until exiting
    pub recover_duration: Duration,
    /// Base damage
    pub base_damage: u32,
    /// Base poise damage
    pub base_poise_damage: u32,
    /// Knockback
    pub knockback: f32,
    /// Max range
    pub range: f32,
    /// Max angle (45.0 will give you a 90.0 angle window)
    pub max_angle: f32,
    /// Affects how far forward the player leaps
    pub forward_leap_strength: f32,
    /// Affects how high the player leaps
    pub vertical_leap_strength: f32,
    /// What key is used to press ability
    pub ability_key: AbilityKey,
}

#[derive(Copy, Clone, Debug, PartialEq, Serialize, Deserialize)]
pub struct Data {
    /// Struct containing data that does not change over the course of the
    /// character state
    pub static_data: StaticData,
    /// Timer for each stage
    pub timer: Duration,
    /// What section the character stage is in
    pub stage_section: StageSection,
    /// Whether the attack can deal more damage
    pub exhausted: bool,
}

impl CharacterBehavior for Data {
    fn behavior(&self, data: &JoinData) -> StateUpdate {
        let mut update = StateUpdate::from(data);

        handle_move(data, &mut update, 0.3);
        handle_jump(data, &mut update);
        if !ability_key_is_pressed(data, self.static_data.ability_key) {
            handle_interrupt(data, &mut update, false);
            match update.character {
                CharacterState::LeapMelee(_) => {},
                _ => {
                    return update;
                },
            }
        }

        match self.stage_section {
            // Delay before leaping into the air
            StageSection::Buildup => {
                // Wait for `buildup_duration` to expire
                if self.timer < self.static_data.buildup_duration {
                    update.character = CharacterState::LeapMelee(Data {
                        timer: self
                            .timer
                            .checked_add(Duration::from_secs_f32(data.dt.0))
                            .unwrap_or_default(),
                        ..*self
                    });
                } else {
                    // Transitions to leap portion of state after buildup delay
                    update.character = CharacterState::LeapMelee(Data {
                        timer: Duration::default(),
                        stage_section: StageSection::Movement,
                        ..*self
                    });
                }
            },
            StageSection::Movement => {
                if self.timer < self.static_data.movement_duration {
                    // Apply jumping force
                    let progress = 1.0
                        - self.timer.as_secs_f32()
                            / self.static_data.movement_duration.as_secs_f32();
                    handle_forced_movement(
                        data,
                        &mut update,
                        ForcedMovement::Leap {
                            vertical: self.static_data.vertical_leap_strength,
                            forward: self.static_data.forward_leap_strength,
                            progress,
                            direction: MovementDirection::Look,
                        },
                        0.15,
                    );

                    // Increment duration
                    // If we were to set a timeout for state, this would be
                    // outside if block and have else check for > movement
                    // duration * some multiplier
                    update.character = CharacterState::LeapMelee(Data {
                        timer: self
                            .timer
                            .checked_add(Duration::from_secs_f32(data.dt.0))
                            .unwrap_or_default(),
                        ..*self
                    });
                } else if data.physics.on_ground {
                    // Transitions to swing portion of state upon hitting ground
                    update.character = CharacterState::LeapMelee(Data {
                        timer: Duration::default(),
                        stage_section: StageSection::Swing,
                        ..*self
                    });
                }
            },
            StageSection::Swing => {
                if self.timer < self.static_data.swing_duration {
                    // Swings weapons
                    update.character = CharacterState::LeapMelee(Data {
                        timer: self
                            .timer
                            .checked_add(Duration::from_secs_f32(data.dt.0))
                            .unwrap_or_default(),
                        ..*self
                    });
                } else {
                    // Transitions to recover portion
                    update.character = CharacterState::LeapMelee(Data {
                        timer: Duration::default(),
                        stage_section: StageSection::Recover,
                        ..*self
                    });
                }
            },
            StageSection::Recover => {
                if !self.exhausted {
                    let damage = Damage {
                        source: DamageSource::Melee,
                        value: self.static_data.base_damage as f32,
                    };
                    let knockback = AttackEffect::Knockback(Knockback {
                        strength: self.static_data.knockback,
                        direction: KnockbackDir::Away,
                    });
                    let buff = AttackEffect::Buff(CombatBuff::default_melee());
                    let damage = DamageComponent::new(damage, Some(GroupTarget::OutOfGroup))
                        .with_effect(knockback)
                        .with_effect(buff);
                    let attack = Attack::default().with_damage(damage).with_crit(0.5, 1.3);

                    // Hit attempt, when animation plays
                    data.updater.insert(data.entity, MeleeAttack {
                        attack,
                        range: self.static_data.range,
                        max_angle: self.static_data.max_angle.to_radians(),
                        applied: false,
                        hit_count: 0,
                    });

                    update.character = CharacterState::LeapMelee(Data {
                        timer: self
                            .timer
                            .checked_add(Duration::from_secs_f32(data.dt.0))
                            .unwrap_or_default(),
                        exhausted: true,
                        ..*self
                    });
                } else if self.timer < self.static_data.recover_duration {
                    // Complete recovery delay before finishing state
                    update.character = CharacterState::LeapMelee(Data {
                        timer: self
                            .timer
                            .checked_add(Duration::from_secs_f32(data.dt.0))
                            .unwrap_or_default(),
                        ..*self
                    });
                } else {
                    // Done
                    update.character = CharacterState::Wielding;
                    // Make sure attack component is removed
                    data.updater.remove::<MeleeAttack>(data.entity);
                }
            },
            _ => {
                // If it somehow ends up in an incorrect stage section
                update.character = CharacterState::Wielding;
                // Make sure attack component is removed
                data.updater.remove::<MeleeAttack>(data.entity);
            },
        }

        update
    }
}