use std::{collections::HashMap, time::Duration};

use anyhow::Result;
use engine::prelude::*;

use crate::entityparser::AnimationData;

#[derive(PartialEq, Eq, Hash, Clone, Copy, Debug, Serialize, Deserialize)]
pub enum AnimationType {
    Move,
    Idle,
    Cast,
    Attack,
    // Add more as you need
}

#[derive(PartialEq, Clone, Serialize, Deserialize, Debug)]
struct AnimationLockInfo {
    start: Duration,
    duration: Duration,
}

#[derive(Debug, Default, PartialEq, Eq, Clone, Serialize, Deserialize)]
pub struct AnimationState {
    index: Option<u32>,
    start_time: Duration,
    repeat: bool,
    lock: bool,
}

pub struct AnimationInfo {
    animation_map: HashMap<AnimationType, Vec<u32>>,
    animation_info: Vec<AnimationData>,

    animation_type: Option<AnimationType>,
    animation_state: AnimationState,
    lock: Option<AnimationLockInfo>,
}

impl AnimationInfo {
    pub fn new(
        animation_info: Vec<AnimationData>,
        animation_map: HashMap<AnimationType, Vec<u32>>,
    ) -> Self {
        Self {
            animation_map,
            animation_info,

            animation_type: None,
            animation_state: Default::default(),

            lock: None,
        }
    }

    pub fn animation_map(&self) -> &HashMap<AnimationType, Vec<u32>> {
        &self.animation_map
    }

    pub fn animation_type(&self) -> Option<AnimationType> {
        self.animation_type
    }

    pub fn is_locked(&self) -> bool {
        self.lock.is_some()
    }

    /// Returns true if there is no lock, otherwise the animation is locked
    pub fn check_lock(&mut self, now: Duration) -> bool {
        match &mut self.lock {
            Some(lock) => {
                if now < lock.start {
                    panic!("Animation::check_lock: `now < start` !?");
                }

                if (now - lock.start) < lock.duration {
                    false
                } else {
                    self.lock = None;

                    true
                }
            }
            None => true,
        }
    }

    /// Make sure `start` is `scene_time`, otherwise you will experience strange behavior
    pub fn set_animation(
        &mut self,
        animation: &mut Animation,
        draw: &mut Draw,
        animation_type: Option<AnimationType>,
        start: Duration,
        lock: bool,
        mut repeat: bool,
    ) -> Result<()> {
        debug_assert!(self.lock.is_none());

        self.animation_type = animation_type;

        match animation_type {
            Some(animation_type) => {
                if let Some(animation_indices) = self.animation_map.get(&animation_type) {
                    assert!(!animation_indices.is_empty());

                    let index = if animation_indices.len() > 1 {
                        animation_indices[Random::range(0, animation_indices.len() as u32) as usize]
                    } else {
                        animation_indices[0]
                    };

                    if lock {
                        repeat = false;

                        let duration = self.animation_info[index as usize].duration;

                        self.lock = Some(AnimationLockInfo { start, duration });
                    }

                    self.animation_state = AnimationState {
                        index: Some(index),
                        start_time: start,
                        repeat,
                        lock,
                    };

                    unsafe { animation.set_animation(draw, Some(index), start, repeat)? };
                }
            }
            None => {
                self.lock = None;

                self.animation_state = AnimationState {
                    index: None,
                    start_time: Duration::default(),
                    repeat: false,
                    lock: false,
                };

                unsafe { animation.set_animation(draw, None, Duration::default(), false)? };
            }
        }

        Ok(())
    }
}

impl Clone for AnimationInfo {
    fn clone(&self) -> Self {
        Self {
            animation_map: self.animation_map.clone(),
            animation_info: self.animation_info.clone(),

            animation_type: None,
            animation_state: AnimationState::default(),

            lock: None,
        }
    }
}

impl EntityComponent for AnimationInfo {
    fn name(&self) -> &str {
        Self::debug_name()
    }
}

impl ComponentDebug for AnimationInfo {
    fn debug_name() -> &'static str {
        "AnimationInfo"
    }
}