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use crate::World;

use super::{
    SystemCondition, SystemConditionElse, System, CreationSystem, SystemThreadLocal,
    AnySystem, SyncSystem, SystemOnce, SystemOnceThreadLocal, CreationSystemOnce,
    SystemOnceRunner, SystemOnceThreadLocalRunner, CreationSystemOnceRunner
};

use super::container::StatsType;
use std::any::TypeId;

macro_rules! impl_builders {
    ($Builder: ident, $BuilderConditions: ident, $BuilderElse: ident, $SystemTy: ident, $ElseTy: path, $constructor_method: ident) => {
        #[must_use = "Systems built with a Builder won't be created until the build method is called"]
        pub struct $Builder<'a, 'n, S>{
            system: S,
            name: Option<&'n str>,
            needs: Option<Vec<TypeId>>,
            updates: Option<Vec<TypeId>>,
            reads: Option<Vec<TypeId>>,
            writes: Option<Vec<TypeId>>,
            world: &'a mut World,
        }

        #[must_use = "Systems built with a Builder won't be created until the build method is called"]
        pub struct $BuilderConditions<'a, 'n, S>{
            system: S,
            name: Option<&'n str>,
            conditions: SystemCondition,
            needs: Option<Vec<TypeId>>,
            updates: Option<Vec<TypeId>>,
            reads: Option<Vec<TypeId>>,
            writes: Option<Vec<TypeId>>,
            world: &'a mut World,
        }

        #[must_use = "Systems built with a Builder won't be created until the build method is called"]
        pub struct $BuilderElse<'a, 'n, S, Else>{
            system: S,
            name: Option<&'n str>,
            else_run: SystemConditionElse<Else>,
            needs: Option<Vec<TypeId>>,
            updates: Option<Vec<TypeId>>,
            reads: Option<Vec<TypeId>>,
            writes: Option<Vec<TypeId>>,
            world: &'a mut World,
        }

        impl<'a, 'n, S: 'static + $SystemTy> $Builder<'a, 'n, S>{
            pub(crate) fn new(system: S, world: &mut World) -> $Builder<S>{
                $Builder{
                    system,
                    name: None,
                    world,
                    needs: None,
                    updates: None,
                    reads: None,
                    writes: None,
                }
            }

            pub fn name(mut self, name: &'n str) -> $Builder<'a, 'n, S>{
                self.name = Some(name);
                self
            }

            pub fn conditions(self, conditions: SystemCondition) -> $BuilderConditions<'a, 'n, S>{
                $BuilderConditions{
                    system: self.system,
                    name: self.name,
                    conditions,
                    world: self.world,
                    needs: self.needs,
                    updates: self.updates,
                    reads: self.reads,
                    writes: self.writes,
                }
            }

            pub fn needs<T: 'static>(mut self) -> $Builder<'a, 'n, S>{
                self.needs.get_or_insert(vec![]).push(TypeId::of::<T>());
                self
            }

            pub fn updates<T: 'static>(mut self) -> $Builder<'a, 'n, S>{
                self.updates.get_or_insert(vec![]).push(TypeId::of::<T>());
                self
            }

            pub fn reads<T: 'static>(mut self) -> $Builder<'a, 'n, S>{
                self.reads.get_or_insert(vec![]).push(TypeId::of::<T>());
                self
            }

            pub fn writes<T: 'static>(mut self) -> $Builder<'a, 'n, S>{
                self.writes.get_or_insert(vec![]).push(TypeId::of::<T>());
                self
            }

            pub fn dependencies_from<S2: $SystemTy>(mut self) -> $Builder<'a, 'n, S>{
                self.needs = Some(S2::needs());
                self.updates = Some(S2::updates());
                self
            }

            pub fn build(self) -> &'a mut World{
                let stats = self.name.map(|n| StatsType::Cpu(n));
                self.world.$constructor_method(
                    self.system,
                    stats,
                    None,
                    self.needs,
                    self.updates,
                    self.reads,
                    self.writes
                )
            }
        }

        impl<'a, 'n, S: 'static + $SystemTy> $BuilderConditions<'a, 'n, S>{
            pub fn name(mut self, name: &'n str) -> $BuilderConditions<'a, 'n, S>{
                self.name = Some(name);
                self
            }

            pub fn else_run<Else>(self, else_run: Else) -> $BuilderElse<'a, 'n, S, Else>{
                let else_run = self.conditions.else_run(else_run);
                $BuilderElse{
                    system: self.system,
                    name: self.name,
                    else_run,
                    world: self.world,
                    needs: self.needs,
                    updates: self.updates,
                    reads: self.reads,
                    writes: self.writes,
                }
            }

            pub fn needs<T: 'static>(mut self) -> $BuilderConditions<'a, 'n, S>{
                self.needs.get_or_insert(vec![]).push(TypeId::of::<T>());
                self
            }

            pub fn updates<T: 'static>(mut self) -> $BuilderConditions<'a, 'n, S>{
                self.updates.get_or_insert(vec![]).push(TypeId::of::<T>());
                self
            }

            pub fn reads<T: 'static>(mut self) -> $BuilderConditions<'a, 'n, S>{
                self.reads.get_or_insert(vec![]).push(TypeId::of::<T>());
                self
            }

            pub fn writes<T: 'static>(mut self) -> $BuilderConditions<'a, 'n, S>{
                self.writes.get_or_insert(vec![]).push(TypeId::of::<T>());
                self
            }

            pub fn dependencies_from<S2: $SystemTy>(mut self) -> $BuilderConditions<'a, 'n, S>{
                self.needs = Some(S2::needs());
                self.updates = Some(S2::updates());
                self
            }

            pub fn build(self) -> &'a mut World{
                let stats = self.name.map(|n| StatsType::Cpu(n));
                self.world.$constructor_method(
                    self.system,
                    stats,
                    Some(self.conditions.build()),
                    self.needs,
                    self.updates,
                    self.reads,
                    self.writes,
                )
            }
        }

        impl<'a, 'n, S: 'static + $SystemTy, Else: $ElseTy> $BuilderElse<'a, 'n, S, Else>{
            pub fn name(mut self, name: &'n str) -> $BuilderElse<'a, 'n, S, Else>{
                self.name = Some(name);
                self
            }

            pub fn needs<T: 'static>(mut self) -> $BuilderElse<'a, 'n, S, Else>{
                self.needs.get_or_insert(vec![]).push(TypeId::of::<T>());
                self
            }

            pub fn updates<T: 'static>(mut self) -> $BuilderElse<'a, 'n, S, Else>{
                self.updates.get_or_insert(vec![]).push(TypeId::of::<T>());
                self
            }

            pub fn reads<T: 'static>(mut self) -> $BuilderElse<'a, 'n, S, Else>{
                self.reads.get_or_insert(vec![]).push(TypeId::of::<T>());
                self
            }

            pub fn writes<T: 'static>(mut self) -> $BuilderElse<'a, 'n, S, Else>{
                self.writes.get_or_insert(vec![]).push(TypeId::of::<T>());
                self
            }

            pub fn dependencies_from<S2: $SystemTy>(mut self) -> $BuilderElse<'a, 'n, S, Else>{
                self.needs = Some(S2::needs());
                self.updates = Some(S2::updates());
                self
            }

            pub fn build(self) -> &'a mut World{
                let stats = self.name.map(|n| StatsType::Cpu(n));
                self.world.$constructor_method(
                    self.system,
                    stats,
                    Some(self.else_run.build()),
                    self.needs,
                    self.updates,
                    self.reads,
                    self.writes,
                )
            }
        }
    };
}

impl_builders!(
    Builder,
    BuilderConditions,
    BuilderElse,
    System,
    AnySystem<SyncSystem>,
    add_any_send_system
);
impl_builders!(
    BuilderOnce,
    BuilderOnceConditions,
    BuilderOnceElse,
    SystemOnce,
    AnySystem<SystemOnceRunner>,
    add_any_send_system_once
);
impl_builders!(
    BuilderThreadLocal,
    BuilderConditionsThreadLocal,
    BuilderElseThreadLocal,
    SystemThreadLocal,
    AnySystem<Box<dyn SystemThreadLocal>>,
    add_any_thread_local_system
);
impl_builders!(
    BuilderOnceThreadLocal,
    BuilderOnceConditionsThreadLocal,
    BuilderOnceElseThreadLocal,
    SystemOnceThreadLocal,
    AnySystem<SystemOnceThreadLocalRunner>,
    add_any_thread_local_system_once
);
impl_builders!(
    BuilderCreation,
    BuilderConditionsCreation,
    BuilderElseCreation,
    CreationSystem,
    AnySystem<Box<dyn CreationSystem>>,
    add_any_creation_system
);
impl_builders!(
    BuilderCreationOnce,
    BuilderConditionsCreationOnce,
    BuilderElseCreationOnce,
    CreationSystemOnce,
    AnySystem<CreationSystemOnceRunner>,
    add_any_creation_system_once
);