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use crate::{
    graphics::{ RendererMaterialHandle, RendererTextureHandle }, 
    resources::{ ResourceStorage, Resource, MaterialHandle, Material, TextureHandle, Texture, TextureType },
    config::*,
};

use pill_core::{ EngineError, get_type_name, PillSlotMapKey, PillTypeMap, PillTypeMapKey };

use std::{
    collections::{HashMap},
    convert::TryInto,
    env,
    num::NonZeroU32,
    path::PathBuf
};
use boolinator::Boolinator;
use anyhow::{Result, Context, Error};

pub struct ResourceManager {
    resources: PillTypeMap,
}

impl ResourceManager {
    pub fn new() -> Self {
	    Self { 
            resources: PillTypeMap::new(),
        }
    }

    // --- Slots ---

    pub(crate) fn get_resource_slot<'a, T>(&'a self, resource_handle: &T::Handle) -> Result<&'a Option<T>> 
        where T: Resource<Storage = ResourceStorage::<T>>
    {
        // Get resource storage
        let resource_storage = self.get_resource_storage::<T>()?;

        // Get resource slot
        let resource_slot = resource_storage.data.get(resource_handle.clone())
            .ok_or(Error::new(EngineError::InvalidResourceHandle(get_type_name::<T>())))?;

        Ok(resource_slot)
    }

    pub(crate) fn get_resource_slot_mut<'a, T>(&'a mut self, resource_handle: &T::Handle) -> Result<&'a mut Option<T>> 
        where T: Resource<Storage = ResourceStorage::<T>>
    {
        // Get resource storage
        let resource_storage = self.get_resource_storage_mut::<T>()?;

        // Get resource slot
        let resource_slot = resource_storage.data.get_mut(resource_handle.clone())
            .ok_or(Error::new(EngineError::InvalidResourceHandle(get_type_name::<T>())))?;

        Ok(resource_slot)
    }

    // --- Storages ---

    pub(crate) fn get_resource_storage<T>(&self) -> Result<&ResourceStorage<T>> 
        where T: Resource<Storage = ResourceStorage::<T>>
    {
        self.resources.get::<T>().ok_or(Error::new(EngineError::ResourceNotRegistered(get_type_name::<T>())))
    }

    pub(crate) fn get_resource_storage_mut<T>(&mut self) -> Result<&mut ResourceStorage<T>> 
        where T: Resource<Storage = ResourceStorage::<T>>
    {
        self.resources.get_mut::<T>().ok_or(Error::new(EngineError::ResourceNotRegistered(get_type_name::<T>())))
    }

    // --- Register - Add - Remove ---

    pub fn register_resource_type<T>(&mut self, max_resource_count: usize) -> Result<()> 
        where T: Resource<Storage = ResourceStorage::<T>>
    {
        self.resources.insert::<T>(ResourceStorage::<T>::new(max_resource_count));

        Ok(())
    }

    pub fn add_resource<T>(&mut self, resource: T) -> Result<(T::Handle, &mut T)> 
        where T: Resource<Storage = ResourceStorage::<T>>
    {
        // Get resource storage
        let resource_storage = self.get_resource_storage_mut::<T>()?;
        let resource_name = resource.get_name().to_owned();

        // Check if there is space for resource
        if resource_storage.data.len() >= resource_storage.max_resource_count {
            return Err(Error::new(EngineError::ResourceLimitReached(get_type_name::<T>())));
        }

        // Check if resource already exists
        if resource_storage.mapping.contains_key(&resource_name) {
            return Err(Error::new(EngineError::ResourceAlreadyExists(get_type_name::<T>(), resource_name.clone())));
        }

        // Insert new resource
        let resource_handle = resource_storage.data.insert(Some(resource));
        let resource = resource_storage.data.get_mut(resource_handle).unwrap().as_mut().unwrap();

        // Insert new mapping
        resource_storage.mapping.insert(&resource_name, &resource_handle);

        Ok((resource_handle, resource))
    }

    pub fn remove_resource<T>(&mut self, resource_handle: &T::Handle) -> Result<(T::Handle, T)> 
        where T: Resource<Storage = ResourceStorage::<T>>
    {
        // Get resource storage
        let resource_storage = self.get_resource_storage_mut::<T>()?;

        // Remove resource
        let resource = resource_storage.data.remove(*resource_handle)
            .ok_or(EngineError::InvalidResourceHandle(get_type_name::<T>()))?.expect("Critical: Resource is None");

        // Remove mapping
        resource_storage.mapping.remove_by_value(resource_handle);

        Ok((resource_handle.clone(), resource))
    } 

    pub fn remove_resource_by_name<T>(&mut self, name: &str) -> Result<(T::Handle, T)> 
        where T: Resource<Storage = ResourceStorage::<T>>
    {
        // Get resource storage
        let resource_storage = self.get_resource_storage_mut::<T>()?;

        // Get handle by name
        let resource_handle = resource_storage.mapping.get_value(&name.to_string())
            .ok_or(EngineError::InvalidResourceName(name.to_string(), get_type_name::<T>()))?.clone();

        // Remove resource
        let resource = resource_storage.data.remove(resource_handle).unwrap().expect("Critical: Resource is None");

        // Remove mapping
        resource_storage.mapping.remove_by_key(&name.to_string());

        Ok((resource_handle, resource))
    } 

    // --- Get ---

    pub fn get_resource_handle<T>(&self, name: &str) -> Result<T::Handle> 
        where T: Resource<Storage = ResourceStorage::<T>>
    {
        // Get resource storage
        let resource_storage = self.get_resource_storage::<T>()?;

        // Get resource handle
        let resource_handle = resource_storage.mapping.get_value(&name.to_string())
            .ok_or(EngineError::InvalidSceneName(name.to_string()))?.clone();
        
        Ok(resource_handle)
    }

    pub fn get_resource<'a, T>(&'a self, resource_handle: &'a T::Handle) -> Result<&'a T> 
        where T: Resource<Storage = ResourceStorage::<T>>
    {
        // Get resource
        let resource = self.get_resource_slot::<T>(resource_handle)?.as_ref().expect("Critical: Resource is None");

        Ok(resource)
    }

    pub fn get_resource_by_name<'a, T>(&'a self, name: &str) -> Result<&'a T> 
        where T: Resource<Storage = ResourceStorage::<T>>
    {
        // Get resource storage
        let resource_storage = self.get_resource_storage::<T>()?;

        // Get handle by name
        let resource_handle = resource_storage.mapping.get_value(&name.to_string())
            .ok_or(EngineError::InvalidResourceName(name.to_string(), get_type_name::<T>()))?;
            
        // Get resource
        let resource = self.get_resource_slot::<T>(resource_handle)?.as_ref().expect("Critical: Resource is None");

        Ok(resource)
    }

    pub fn get_resource_mut<'a, T>(&'a mut self, resource_handle: &'a T::Handle) -> Result<&'a mut T> 
        where T: Resource<Storage = ResourceStorage::<T>>
    {
        // Get resource
        let resource = self.get_resource_slot_mut::<T>(resource_handle)?.as_mut().expect("Critical: Resource is None");

        Ok(resource)
    }

    pub fn get_resource_by_name_mut<'a, T>(&'a mut self, name: &str) -> Result<&'a mut T> 
        where T: Resource<Storage = ResourceStorage::<T>>
    {
        // Get resource storage
        let resource_storage = self.get_resource_storage_mut::<T>()?;

        // Get handle by name
        let resource_handle = resource_storage.mapping.get_value(&name.to_string())
            .ok_or(EngineError::InvalidResourceName(name.to_string(), get_type_name::<T>()))?.clone();

        // Get resource
        let resource = self.get_resource_slot_mut::<T>(&resource_handle)?.as_mut().expect("Critical: Resource is None");

        Ok(resource)
    }
}