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use std::collections::{BTreeSet};
use std::fmt::{Debug};
use std::sync::Arc;
use maplit::btreeset;
use crate::ast::handler::HandlerGroupDeclaration;
use crate::availability::Availability;
use crate::ast::config::Config;
use crate::ast::data_set::DataSet;
use crate::ast::model::Model;
use crate::ast::r#enum::Enum;
use crate::ast::identifier::Identifier;
use crate::ast::doc_comment::DocComment;
use crate::{declare_container_node, impl_container_node_defaults, node_child_fn, node_optional_child_fn};
use crate::ast::decorator::Decorator;
use crate::ast::empty_decorator::EmptyDecorator;
use crate::ast::node::Node;
use crate::format::Writer;
use crate::traits::node_trait::NodeTrait;
use crate::traits::write::Write;

declare_container_node!(Namespace, named,
    pub(crate) comment: Option<usize>,
    pub(crate) identifier: usize,
    pub(crate) references: NamespaceReferences,
);

impl_container_node_defaults!(Namespace, named);

impl Namespace {

    node_child_fn!(identifier, Identifier);

    node_optional_child_fn!(comment, DocComment);

    pub fn parent_str_path(&self) -> Vec<&str> {
        self.string_path.iter().rev().skip(1).rev().map(AsRef::as_ref).collect()
    }

    pub fn get_connector(&self) -> Option<&Config> {
        self.references.connector.map(|id| self.children.get(&id).unwrap().as_config().unwrap())
    }

    fn get_enum(&self, id: usize) -> Option<&Enum> {
        self.children.get(&id).unwrap().as_enum()
    }

    fn get_model(&self, id: usize) -> Option<&Model> {
        self.children.get(&id).unwrap().as_model()
    }

    pub fn get_namespace(&self, id: usize) -> Option<&Namespace> {
        self.children.get(&id).unwrap().as_namespace()
    }

    fn get_data_set(&self, id: usize) -> Option<&DataSet> {
        self.children.get(&id).unwrap().as_data_set()
    }

    fn get_handler_group(&self, id: usize) -> Option<&HandlerGroupDeclaration> {
        self.children.get(&id).unwrap().as_handler_group_declaration()
    }

    pub fn models(&self) -> Vec<&Model> {
        self.references.models.iter().map(|m| self.get_model(*m).unwrap()).collect()
    }

    pub fn enums(&self) -> Vec<&Enum> {
        self.references.enums.iter().map(|m| self.get_enum(*m).unwrap()).collect()
    }

    pub fn handler_groups(&self) -> Vec<&HandlerGroupDeclaration> {
        self.references.namespaces.iter().map(|m| self.get_handler_group(*m).unwrap()).collect()
    }

    pub fn namespaces(&self) -> Vec<&Namespace> {
        self.references.namespaces.iter().map(|m| self.get_namespace(*m).unwrap()).collect()
    }

    pub fn data_sets(&self) -> Vec<&DataSet> {
        self.references.data_sets.iter().map(|m| self.get_data_set(*m).unwrap()).collect()
    }

    pub fn empty_decorators(&self) -> Vec<&EmptyDecorator> {
        self.references.empty_decorators.iter().map(|m| self.children.get(m).unwrap().as_empty_decorator().unwrap()).collect()
    }

    pub fn unattached_decorators(&self) -> Vec<&Decorator> {
        self.references.unattached_decorators.iter().map(|m| self.children.get(m).unwrap().as_decorator().unwrap()).collect()
    }

    pub fn find_top_by_name(&self, name: &str, filter: &Arc<dyn Fn(&Node) -> bool>, availability: Availability) -> Option<&Node> {
        self.children.values().find(|t| {
            if let Some(n) = t.name() {
                (n == name) && filter(*t) && t.available_test(availability)
            } else {
                false
            }
        }).map(|t| t)
    }

    pub fn find_top_by_id(&self, id: usize) -> Option<&Node> {
        self.children.get(&id)
    }

    pub fn find_node_by_string_path(&self, path: &Vec<&str>, filter: &Arc<dyn Fn(&Node) -> bool>, availability: Availability) -> Option<&Node> {
        if path.len() == 0 {
            return None;
        } else if path.len() == 1 {
            self.find_top_by_name(path.get(0).unwrap(), filter, availability)
        } else {
            let mut path_for_ns = path.clone();
            path_for_ns.remove(path_for_ns.len() - 1);
            let child_ns = self.find_child_namespace_by_string_path(&path_for_ns);
            return if let Some(child_ns) = child_ns {
                child_ns.find_top_by_name(path.last().unwrap(), filter, availability)
            } else {
                None
            }
        }
    }

    pub fn find_child_namespace_by_string_path(&self, path: &Vec<&str>) -> Option<&Namespace> {
        let mut retval = self;
        for name in path {
            if let Some(child) = retval.namespaces().iter().find(|n| n.identifier().name() == *name) {
                retval = child
            } else {
                return None
            }
        }
        Some(retval)
    }
}

#[derive(Debug)]
pub struct NamespaceReferences {
    pub constants: BTreeSet<usize>,
    pub connector: Option<usize>,
    pub configs: BTreeSet<usize>,
    pub enums: BTreeSet<usize>,
    pub models: BTreeSet<usize>,
    pub data_sets: BTreeSet<usize>,
    pub interfaces: BTreeSet<usize>,
    pub namespaces: BTreeSet<usize>,
    pub config_declarations: BTreeSet<usize>,
    pub decorator_declarations: BTreeSet<usize>,
    pub pipeline_item_declarations: BTreeSet<usize>,
    pub middlewares: BTreeSet<usize>,
    pub handlers: BTreeSet<usize>,
    pub handler_groups: BTreeSet<usize>,
    pub struct_declarations: BTreeSet<usize>,
    pub use_middlewares_block: Option<usize>,
    pub empty_decorators: BTreeSet<usize>,
    pub unattached_decorators: BTreeSet<usize>,
}

impl NamespaceReferences {

    pub fn new() -> Self {
        Self {
            constants: btreeset!{},
            connector: None,
            configs: btreeset!{},
            enums: btreeset!{},
            models: btreeset!{},
            data_sets: btreeset!{},
            interfaces: btreeset!{},
            namespaces: btreeset!{},
            config_declarations: btreeset!{},
            decorator_declarations: btreeset!{},
            pipeline_item_declarations: btreeset!{},
            middlewares: btreeset!{},
            handlers: btreeset!{},
            handler_groups: btreeset!{},
            struct_declarations: btreeset!{},
            use_middlewares_block: None,
            empty_decorators: btreeset! {},
            unattached_decorators: btreeset! {},
        }
    }
}

impl Write for Namespace {
    fn write<'a>(&'a self, writer: &mut Writer<'a>) {
        writer.write_children(self, self.children.values());
    }
    fn is_block_level_element(&self) -> bool {
        true
    }
}