use crate::{
    comp::{Attacking, CharacterState, EnergySource, StateUpdate},
    states::utils::{StageSection, *},
    sys::character_behavior::*,
};
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 long until the state attacks
    pub buildup_duration: Duration,
    /// How long the state is in the swing duration
    pub swing_duration: Duration,
    /// How long until state ends
    pub recover_duration: Duration,
    /// Base damage
    pub base_damage: u32,
    /// Knockback
    pub knockback: f32,
    /// Range
    pub range: f32,
    /// Energy cost per attack
    pub energy_cost: u32,
    /// Whether spin state is infinite
    pub is_infinite: bool,
    /// Used to maintain classic axe spin physics
    pub is_helicopter: bool,
    /// Used for forced forward movement
    pub forward_speed: f32,
    /// Number of spins
    pub num_spins: u32,
}

#[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,
    /// How many spins it can do before ending
    pub spins_remaining: u32,
    /// What section the character stage is in
    pub stage_section: StageSection,
    /// Whether the state can deal damage
    pub exhausted: bool,
}

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

        if self.static_data.is_helicopter {
            update.vel.0 = Vec3::new(data.inputs.move_dir.x, data.inputs.move_dir.y, 0.0) * 5.0;
        } else {
            handle_orientation(data, &mut update, 1.0);
        }

        if self.stage_section == StageSection::Buildup
            && self.timer < self.static_data.buildup_duration
        {
            // Build up
            update.character = CharacterState::SpinMelee(Data {
                static_data: self.static_data,
                timer: self
                    .timer
                    .checked_add(Duration::from_secs_f32(data.dt.0))
                    .unwrap_or_default(),
                spins_remaining: self.spins_remaining,
                stage_section: self.stage_section,
                exhausted: self.exhausted
            });
        } else if self.stage_section == StageSection::Buildup {
            // Transitions to swing section of stage
            update.character = CharacterState::SpinMelee(Data {
                static_data: self.static_data,
                timer: Duration::default(),
                spins_remaining: self.spins_remaining,
                stage_section: StageSection::Swing,
                exhausted: self.exhausted
            });
        } else if !self.exhausted {
            update.character = CharacterState::SpinMelee(Data {
                static_data: self.static_data,
                timer: Duration::default(),
                spins_remaining: self.spins_remaining,
                stage_section: self.stage_section,
                exhausted: true,
            });
            // Hit attempt
            data.updater.insert(data.entity, Attacking {
                base_healthchange: -(self.static_data.base_damage as i32),
                range: self.static_data.range,
                max_angle: 180_f32.to_radians(),
                applied: false,
                hit_count: 0,
                knockback: self.static_data.knockback,
            });
        } else if self.stage_section == StageSection::Swing
            && self.timer < self.static_data.swing_duration
        {
            forward_move(data, &mut update, 0.1, self.static_data.forward_speed);

            // Swings
            update.character = CharacterState::SpinMelee(Data {
                static_data: self.static_data,
                timer: self
                    .timer
                    .checked_add(Duration::from_secs_f32(data.dt.0))
                    .unwrap_or_default(),
                spins_remaining: self.spins_remaining,
                stage_section: self.stage_section,
                exhausted: self.exhausted
            });
        } else if update.energy.current() >= self.static_data.energy_cost
        && (self.spins_remaining != 0
            || (self.static_data.is_infinite && data.inputs.secondary.is_pressed()))
    {
        let new_spins_remaining = if self.static_data.is_infinite {
            self.spins_remaining
        } else {
            self.spins_remaining - 1
        };
        update.character = CharacterState::SpinMelee(Data {
            static_data: self.static_data,
            timer: Duration::default(),
            spins_remaining: new_spins_remaining,
            stage_section: self.stage_section,
            exhausted: false,
        });
        // Consumes energy if there's enough left and RMB is held down
        update.energy.change_by(
            -(self.static_data.energy_cost as i32),
            EnergySource::Ability,
        );
    } else if self.stage_section == StageSection::Swing {
            // Transitions to recover section of stage
            update.character = CharacterState::SpinMelee(Data {
                static_data: self.static_data,
                timer: Duration::default(),
                spins_remaining: self.spins_remaining,
                stage_section: StageSection::Recover,
                exhausted: self.exhausted
            })
        } else if self.stage_section == StageSection::Recover
            && self.timer < self.static_data.recover_duration
        {
            // Recover
            update.character = CharacterState::SpinMelee(Data {
                static_data: self.static_data,
                timer: self
                    .timer
                    .checked_add(Duration::from_secs_f32(data.dt.0))
                    .unwrap_or_default(),
                spins_remaining: self.spins_remaining,
                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);
        }

        update
    }
}