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use crate::{
    combat::{self, CombatEffect},
    comp::{character_state::OutputEvents, CharacterState, MeleeConstructor, StateUpdate},
    event::LocalEvent,
    outcome::Outcome,
    states::{
        behavior::{CharacterBehavior, JoinData},
        utils::{StageSection, *},
    },
};
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,
    /// Used to construct the Melee attack
    pub melee_constructor: MeleeConstructor,
    /// Used to specify the sfx to the frontend
    pub specifier: Option<FrontendSpecifier>,
    /// 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_info: AbilityInfo,
    ///
    pub damage_effect: Option<CombatEffect>,
}

#[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, output_events: &mut OutputEvents) -> StateUpdate {
        let mut update = StateUpdate::from(data);

        handle_orientation(data, &mut update, 1.0, None);
        handle_move(data, &mut update, 0.3);
        handle_jump(data, output_events, &mut update, 1.0);

        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: tick_attack_or_default(data, self.timer, None),
                        ..*self
                    });
                } else {
                    // Transitions to leap portion of state after buildup delay
                    update.character = CharacterState::LeapMelee(Data {
                        timer: Duration::default(),
                        stage_section: StageSection::Movement,
                        ..*self
                    });
                    if let Some(FrontendSpecifier::ElderLeap) = self.static_data.specifier {
                        // Send local event used for frontend shenanigans
                        output_events.emit_local(LocalEvent::CreateOutcome(Outcome::Whoosh {
                            pos: data.pos.0 + *data.ori.look_dir() * (data.body.max_radius()),
                        }));
                    }
                }
            },
            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,
                    });

                    // 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: tick_attack_or_default(data, self.timer, None),
                        ..*self
                    });
                } else if data.physics.on_ground.is_some() | data.physics.in_liquid().is_some() {
                    // Transitions to swing portion of state upon hitting ground
                    update.character = CharacterState::LeapMelee(Data {
                        timer: Duration::default(),
                        stage_section: StageSection::Action,
                        ..*self
                    });
                }
            },
            StageSection::Action => {
                if self.timer < self.static_data.swing_duration {
                    // Swings weapons
                    update.character = CharacterState::LeapMelee(Data {
                        timer: tick_attack_or_default(data, self.timer, None),
                        ..*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 precision_mult = combat::compute_precision_mult(data.inventory, data.msm);
                    let tool_stats = get_tool_stats(data, self.static_data.ability_info);

                    data.updater.insert(
                        data.entity,
                        self.static_data
                            .melee_constructor
                            .create_melee(precision_mult, tool_stats),
                    );

                    update.character = CharacterState::LeapMelee(Data {
                        timer: tick_attack_or_default(data, self.timer, None),
                        exhausted: true,
                        ..*self
                    });
                } else if self.timer < self.static_data.recover_duration {
                    // Complete recovery delay before finishing state
                    update.character = CharacterState::LeapMelee(Data {
                        timer: tick_attack_or_default(data, self.timer, None),
                        ..*self
                    });
                } else {
                    // Done
                    end_melee_ability(data, &mut update);
                }
            },
            _ => {
                // If it somehow ends up in an incorrect stage section
                end_melee_ability(data, &mut update);
            },
        }

        // At end of state logic so an interrupt isn't overwritten
        handle_interrupts(data, &mut update, output_events);

        update
    }
}

#[derive(Copy, Clone, Debug, Serialize, Deserialize, PartialEq, Eq)]
pub enum FrontendSpecifier {
    ElderLeap,
}