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use std::error::Error;

use serde::{Deserialize, Serialize};

use crate::{
    ai_interface::{
        callback::{facing::Facing, feature_def::FeatureDef, unit_def::UnitDef},
        AIInterface,
    },
    get_callback,
};

#[derive(Debug, Copy, PartialEq, Eq, Hash, Clone, Serialize, Deserialize)]
pub struct Feature {
    pub ai_id: i32,
    pub(crate) feature_id: i32,
}

#[derive(Debug, Clone)]
pub struct FeatureInterface {
    pub ai_id: i32,
}

#[derive(Debug, Clone)]
pub struct FeatureAll {
    feature_def: FeatureDef,
    health: f32,
    reclaim_left: f32,
    position: [f32; 3],
    ressurect_def: UnitDef,
    building_facing: Facing,
}

impl AIInterface {
    pub fn feature_interface(&self) -> FeatureInterface {
        FeatureInterface { ai_id: self.ai_id }
    }
}

const MAX_FEATURES: usize = 128;

impl FeatureInterface {
    pub fn get_features(&self) -> Result<Vec<Feature>, Box<dyn Error>> {
        let get_features = get_callback!(self.ai_id, getFeatures)?;

        let mut ret = [-1_i32; MAX_FEATURES];
        unsafe { get_features(self.ai_id, ret.as_mut_ptr(), MAX_FEATURES as i32) };

        Ok(ret
            .iter()
            .filter_map(|&i| {
                if i == -1 {
                    None
                } else {
                    Some(Feature {
                        ai_id: self.ai_id,
                        feature_id: i,
                    })
                }
            })
            .collect())
    }

    pub fn features_at(
        &self,
        location: [f32; 3],
        radius: f32,
        spherical: bool,
    ) -> Result<Vec<Feature>, Box<dyn Error>> {
        let get_features_func = get_callback!(self.ai_id, getFeaturesIn)?;

        let mut unit_list = [-1_i32; MAX_FEATURES];
        unsafe {
            get_features_func(
                self.ai_id,
                location.clone().as_mut_ptr(),
                radius,
                spherical,
                unit_list.as_mut_ptr(),
                MAX_FEATURES as i32,
            )
        };

        Ok(unit_list
            .iter()
            .filter_map(|&feature_id| {
                if feature_id == -1 {
                    None
                } else {
                    Some(Feature {
                        ai_id: self.ai_id,
                        feature_id,
                    })
                }
            })
            .collect())
    }
}

impl Feature {
    pub fn feature_def(&self) -> Result<FeatureDef, Box<dyn Error>> {
        let get_def_func = get_callback!(self.ai_id, Feature_getDef)?;
        Ok(FeatureDef {
            ai_id: self.ai_id,
            feature_def_id: unsafe { get_def_func(self.ai_id, self.feature_id) },
        })
    }

    pub fn health(&self) -> Result<f32, Box<dyn Error>> {
        let get_max_health = get_callback!(self.ai_id, Feature_getHealth)?;
        Ok(unsafe { get_max_health(self.ai_id, self.feature_id) })
    }

    pub fn reclaim_left(&self) -> Result<f32, Box<dyn Error>> {
        let get_max_health = get_callback!(self.ai_id, Feature_getReclaimLeft)?;
        Ok(unsafe { get_max_health(self.ai_id, self.feature_id) })
    }

    pub fn position(&self) -> Result<[f32; 3], Box<dyn Error>> {
        let get_position_func = get_callback!(self.ai_id, Feature_getPosition)?;

        let mut ret = [0.0_f32; 3];
        unsafe { get_position_func(self.ai_id, self.feature_id, ret.as_mut_ptr()) };

        Ok(ret)
    }

    pub fn ressurect_def(&self) -> Result<UnitDef, Box<dyn Error>> {
        let get_ressurect_def = get_callback!(self.ai_id, Feature_getResurrectDef)?;
        let ressurect_def_id = unsafe { get_ressurect_def(self.ai_id, self.feature_id) };
        Ok(UnitDef {
            ai_id: self.ai_id,
            def_id: ressurect_def_id,
        })
    }

    pub fn building_facing(&self) -> Result<Facing, Box<dyn Error>> {
        let get_building_facing = get_callback!(self.ai_id, Feature_getBuildingFacing)?;
        Ok((unsafe { get_building_facing(self.ai_id, self.feature_id) } as i32).into())
    }

    pub fn all(&self) -> Result<FeatureAll, Box<dyn Error>> {
        Ok(FeatureAll {
            feature_def: self.feature_def()?,
            health: self.health()?,
            reclaim_left: self.reclaim_left()?,
            position: self.position()?,
            ressurect_def: self.ressurect_def()?,
            building_facing: self.building_facing()?,
        })
    }
}