veloren/common/src/states/basic_melee.rs

use crate::{
    combat::{Attack, AttackDamage, AttackEffect, CombatBuff, CombatEffect, CombatRequirement},
    comp::{tool::ToolKind, CharacterState, Melee, StateUpdate},
    states::{
        behavior::{CharacterBehavior, JoinData},
        utils::*,
    },
    Damage, DamageKind, 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 until state should deal damage
    pub buildup_duration: Duration,
    /// How long the state is swinging for
    pub swing_duration: Duration,
    /// How long the state has until exiting
    pub recover_duration: Duration,
    /// Base damage
    pub base_damage: f32,
    /// Base poise reduction
    pub base_poise_damage: f32,
    /// 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,
    /// Adds an effect onto the main damage of the attack
    pub damage_effect: Option<CombatEffect>,
    /// What key is used to press ability
    pub ability_info: AbilityInfo,
    /// Which kind of damage does this attack deal
    pub damage_kind: DamageKind,
}

#[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_orientation(data, &mut update, 1.0);
        handle_move(data, &mut update, 0.7);
        handle_jump(data, &mut update, 1.0);
        handle_orientation(data, &mut update, 0.35);

        match self.stage_section {
            StageSection::Buildup => {
                if self.timer < self.static_data.buildup_duration {
                    // Build up
                    update.character = CharacterState::BasicMelee(Data {
                        timer: tick_attack_or_default(data, self.timer, None),
                        ..*self
                    });
                } else {
                    // Transitions to swing section of stage
                    update.character = CharacterState::BasicMelee(Data {
                        timer: Duration::default(),
                        stage_section: StageSection::Swing,
                        ..*self
                    });
                }
            },
            StageSection::Swing => {
                if !self.exhausted {
                    update.character = CharacterState::BasicMelee(Data {
                        timer: Duration::default(),
                        exhausted: true,
                        ..*self
                    });

                    let poise = AttackEffect::new(
                        Some(GroupTarget::OutOfGroup),
                        CombatEffect::Poise(self.static_data.base_poise_damage as f32),
                    )
                    .with_requirement(CombatRequirement::AnyDamage);
                    let knockback = AttackEffect::new(
                        Some(GroupTarget::OutOfGroup),
                        CombatEffect::Knockback(Knockback {
                            strength: self.static_data.knockback,
                            direction: KnockbackDir::Away,
                        }),
                    )
                    .with_requirement(CombatRequirement::AnyDamage);
                    let energy = AttackEffect::new(None, CombatEffect::EnergyReward(50.0))
                        .with_requirement(CombatRequirement::AnyDamage);
                    let mut damage = AttackDamage::new(
                        Damage {
                            source: DamageSource::Melee,
                            kind: self.static_data.damage_kind,
                            value: self.static_data.base_damage as f32,
                        },
                        Some(GroupTarget::OutOfGroup),
                    );
                    match self.static_data.damage_effect {
                        Some(effect) => damage = damage.with_effect(effect),
                        None => {
                            let buff = CombatEffect::Buff(CombatBuff::default_physical());
                            damage = damage.with_effect(buff);
                        },
                    }
                    let (crit_chance, crit_mult) =
                        get_crit_data(data, self.static_data.ability_info);
                    let attack = Attack::default()
                        .with_damage(damage)
                        .with_crit(crit_chance, crit_mult)
                        .with_effect(energy)
                        .with_effect(poise)
                        .with_effect(knockback)
                        .with_combo_increment();

                    // Hit attempt
                    data.updater.insert(data.entity, Melee {
                        attack,
                        range: self.static_data.range,
                        max_angle: self.static_data.max_angle,
                        applied: false,
                        hit_count: 0,
                        break_block: data
                            .inputs
                            .select_pos
                            .map(|p| {
                                (
                                    p.map(|e| e.floor() as i32),
                                    self.static_data.ability_info.tool,
                                )
                            })
                            .filter(|(_, tool)| tool == &Some(ToolKind::Pick)),
                    });
                } else if self.timer < self.static_data.swing_duration {
                    // Swings
                    update.character = CharacterState::BasicMelee(Data {
                        timer: tick_attack_or_default(data, self.timer, None),
                        ..*self
                    });
                } else {
                    // Transitions to recover section of stage
                    update.character = CharacterState::BasicMelee(Data {
                        timer: Duration::default(),
                        stage_section: StageSection::Recover,
                        ..*self
                    });
                }
            },
            StageSection::Recover => {
                if self.timer < self.static_data.recover_duration {
                    // Recovery
                    update.character = CharacterState::BasicMelee(Data {
                        timer: tick_attack_or_default(data, self.timer, None),
                        ..*self
                    });
                } else {
                    // Done
                    if input_is_pressed(data, self.static_data.ability_info.input) {
                        reset_state(self, data, &mut update);
                    } else {
                        update.character = CharacterState::Wielding;
                    }
                }
            },
            _ => {
                // If it somehow ends up in an incorrect stage section
                update.character = CharacterState::Wielding;
                // Make sure attack component is removed
                data.updater.remove::<Melee>(data.entity);
            },
        }

        // At end of state logic so an interrupt isn't overwritten
        if !input_is_pressed(data, self.static_data.ability_info.input) {
            handle_state_interrupt(data, &mut update, false);
        }

        update
    }
}

fn reset_state(data: &Data, join: &JoinData, update: &mut StateUpdate) {
    handle_input(join, update, data.static_data.ability_info.input);
}