veloren/common/src/states/dash_melee.rs

use crate::{
    comp::{Attacking, CharacterState, EnergySource, StateUpdate},
    states::utils::*,
    sys::character_behavior::{CharacterBehavior, JoinData},
    Damage, Damages,
};
use serde::{Deserialize, Serialize};
use std::time::Duration;
use vek::Vec3;

/// Separated out to condense update portions of character state
#[derive(Copy, Clone, Debug, PartialEq, Serialize, Deserialize)]
pub struct StaticData {
    /// How much damage the attack initially does
    pub base_damage: u32,
    /// How much damage the attack does at max charge distance
    pub max_damage: u32,
    /// How much the attack knocks the target back initially
    pub base_knockback: f32,
    /// How much knockback happens at max charge distance
    pub max_knockback: f32,
    /// Range of the attack
    pub range: f32,
    /// Angle of the attack
    pub angle: f32,
    /// Rate of energy drain
    pub energy_drain: u32,
    /// How quickly dasher moves forward
    pub forward_speed: f32,
    /// Whether state keeps charging after reaching max charge duration
    pub infinite_charge: bool,
    /// How long until state should deal damage
    pub buildup_duration: Duration,
    /// How long the state charges for until it reaches max damage
    pub charge_duration: Duration,
    /// Suration of state spent in swing
    pub swing_duration: Duration,
    /// How long the state has until exiting
    pub recover_duration: Duration,
    /// Whether the state can be interrupted by other abilities
    pub is_interruptible: bool,
}

#[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,
    /// Whether the charge should end
    pub end_charge: bool,
    /// Timer for each stage
    pub timer: Duration,
    /// What section the character stage is in
    pub stage_section: StageSection,
    /// Whether the state should attempt attacking again
    pub exhausted: bool,
}

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

        handle_orientation(data, &mut update, 1.0);
        handle_move(data, &mut update, 0.1);

        // Allows for other states to interrupt this state
        if self.static_data.is_interruptible && !data.inputs.secondary.is_pressed() {
            handle_interrupt(data, &mut update);
            match update.character {
                CharacterState::DashMelee(_) => {},
                _ => {
                    return update;
                },
            }
        }

        match self.stage_section {
            StageSection::Buildup => {
                if self.timer < self.static_data.buildup_duration {
                    // Build up
                    update.character = CharacterState::DashMelee(Data {
                        static_data: self.static_data,
                        end_charge: self.end_charge,
                        timer: self
                            .timer
                            .checked_add(Duration::from_secs_f32(data.dt.0))
                            .unwrap_or_default(),
                        stage_section: self.stage_section,
                        exhausted: self.exhausted,
                    });
                } else {
                    // Transitions to charge section of stage
                    update.character = CharacterState::DashMelee(Data {
                        static_data: self.static_data,
                        end_charge: self.end_charge,
                        timer: Duration::default(),
                        stage_section: StageSection::Charge,
                        exhausted: self.exhausted,
                    });
                }
            },
            StageSection::Charge => {
                if (self.timer < self.static_data.charge_duration
                    || (self.static_data.infinite_charge && data.inputs.secondary.is_pressed()))
                    && update.energy.current() > 0
                    && !self.end_charge
                {
                    // Forward movement
                    forward_move(data, &mut update, 0.1, self.static_data.forward_speed);

                    // Hit attempt (also checks if player is moving)
                    if !self.exhausted && update.vel.0.distance_squared(Vec3::zero()) > 1.0 {
                        let charge_frac = (self.timer.as_secs_f32()
                            / self.static_data.charge_duration.as_secs_f32())
                        .min(1.0);
                        let damage = (self.static_data.max_damage as f32
                            - self.static_data.base_damage as f32)
                            * charge_frac
                            + self.static_data.base_damage as f32;
                        let knockback = (self.static_data.max_knockback
                            - self.static_data.base_knockback)
                            * charge_frac
                            + self.static_data.base_knockback;
                        data.updater.insert(data.entity, Attacking {
                            damages: Damages::new(Some(Damage::Melee(damage)), None),
                            range: self.static_data.range,
                            max_angle: self.static_data.angle.to_radians(),
                            applied: false,
                            hit_count: 0,
                            knockback,
                        });
                    }

                    // This logic basically just decides if a charge should end, and prevents the
                    // character state spamming attacks while checking if it has hit something
                    if !self.exhausted {
                        update.character = CharacterState::DashMelee(Data {
                            static_data: self.static_data,
                            end_charge: self.end_charge,
                            timer: self
                                .timer
                                .checked_add(Duration::from_secs_f32(data.dt.0))
                                .unwrap_or_default(),
                            stage_section: StageSection::Charge,
                            exhausted: true,
                        })
                    } else if let Some(attack) = data.attacking {
                        if attack.applied && attack.hit_count > 0 {
                            update.character = CharacterState::DashMelee(Data {
                                static_data: self.static_data,
                                end_charge: !self.static_data.infinite_charge,
                                timer: self
                                    .timer
                                    .checked_add(Duration::from_secs_f32(data.dt.0))
                                    .unwrap_or_default(),
                                stage_section: StageSection::Charge,
                                exhausted: false,
                            })
                        } else if attack.applied {
                            update.character = CharacterState::DashMelee(Data {
                                static_data: self.static_data,
                                end_charge: self.end_charge,
                                timer: self
                                    .timer
                                    .checked_add(Duration::from_secs_f32(data.dt.0))
                                    .unwrap_or_default(),
                                stage_section: StageSection::Charge,
                                exhausted: false,
                            })
                        } else {
                            update.character = CharacterState::DashMelee(Data {
                                static_data: self.static_data,
                                end_charge: !self.static_data.infinite_charge,
                                timer: self
                                    .timer
                                    .checked_add(Duration::from_secs_f32(data.dt.0))
                                    .unwrap_or_default(),
                                stage_section: StageSection::Charge,
                                exhausted: self.exhausted,
                            })
                        }
                    } else {
                        update.character = CharacterState::DashMelee(Data {
                            static_data: self.static_data,
                            end_charge: !self.static_data.infinite_charge,
                            timer: self
                                .timer
                                .checked_add(Duration::from_secs_f32(data.dt.0))
                                .unwrap_or_default(),
                            stage_section: StageSection::Charge,
                            exhausted: self.exhausted,
                        })
                    }

                    // Consumes energy if there's enough left and charge has not stopped
                    update.energy.change_by(
                        -(self.static_data.energy_drain as f32 * data.dt.0) as i32,
                        EnergySource::Ability,
                    );
                } else {
                    // Transitions to swing section of stage
                    update.character = CharacterState::DashMelee(Data {
                        static_data: self.static_data,
                        end_charge: self.end_charge,
                        timer: Duration::default(),
                        stage_section: StageSection::Swing,
                        exhausted: self.exhausted,
                    });
                }
            },
            StageSection::Swing => {
                if self.timer < self.static_data.swing_duration {
                    // Swings
                    update.character = CharacterState::DashMelee(Data {
                        static_data: self.static_data,
                        end_charge: self.end_charge,
                        timer: self
                            .timer
                            .checked_add(Duration::from_secs_f32(data.dt.0))
                            .unwrap_or_default(),
                        stage_section: self.stage_section,
                        exhausted: self.exhausted,
                    });
                } else {
                    // Transitions to recover section of stage
                    update.character = CharacterState::DashMelee(Data {
                        static_data: self.static_data,
                        end_charge: self.end_charge,
                        timer: Duration::default(),
                        stage_section: StageSection::Recover,
                        exhausted: self.exhausted,
                    });
                }
            },
            StageSection::Recover => {
                if self.timer < self.static_data.recover_duration {
                    // Recover
                    update.character = CharacterState::DashMelee(Data {
                        static_data: self.static_data,
                        end_charge: self.end_charge,
                        timer: self
                            .timer
                            .checked_add(Duration::from_secs_f32(data.dt.0))
                            .unwrap_or_default(),
                        stage_section: self.stage_section,
                        exhausted: self.exhausted,
                    });
                } else {
                    // Done
                    update.character = CharacterState::Wielding;
                    // Make sure attack component is removed
                    data.updater.remove::<Attacking>(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::<Attacking>(data.entity);
            },
        }

        update
    }
}