/*
 * Copyright 2024 Luca Fulchir <luca.fulchir@runesauth.com>
 *
 * Licensed under the Apache License, Version 2.0 with LLVM exception (the
 * "License"); you may not use this file except in compliance with the
 * License. You may obtain a copy of the License and of the exception at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *     https://spdx.org/licenses/LLVM-exception.html
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#![feature(proc_macro_span)]
use ::proc_macro::TokenStream;

mod collection;
mod pkgs;
mod repos;

//
// ####### Repository stuff ##########
//

/// Use as #[::bok::repository(MyBaseRepo)]
/// Will setup a `base` field that is the given base repo
/// and add `#[derive(::bok::Repository)]`
///
/// e.g.: `#[::bok::repository(::bok::RepositoryEmpty)]`
#[::macro_magic::import_tokens_attr]
//#[with_custom_parsing(repos::BaseSet)]
#[proc_macro_attribute]
pub fn repository(attrs: TokenStream, input: TokenStream) -> TokenStream {
    crate::repos::repository(attrs, input)
}

/// Unless you know what you are doing, use `#[::bok::repository(MyBaseRepo)]`
/// instead needs a `.base` field
///
/// Use like:
/// ```
/// #[derive(::bok::Repository)]
/// pub struct MyRepo {
///   base : BaseRepo,
/// }
/// ```
/// adds extension capabilities to a repo
#[proc_macro_derive(Repository)]
pub fn derive_repository(input: TokenStream) -> TokenStream {
    crate::repos::derive_repository(input)
}

/// Add multiple packages to a repo
/// Usage:
/// ```
/// #[::bok::repo_packages(Mypkg1, Mypkg2)]
/// struct MyRepo{}
/// ```
#[proc_macro_attribute]
pub fn repo_packages(attrs: TokenStream, input: TokenStream) -> TokenStream {
    crate::repos::repo_packages(attrs, input)
}

/// Create the methods that will return the builders and packages
///
/// will actually merely rewrite the macro to get the actual Repo name
/// in `#[::bok_macro::repo_impl_methods(MyRepo)]`
///
/// Usage:
/// ```
/// #[::bok::repo_impl]
/// impl MyRepo{}
/// ```
//#[::macro_magic::import_tokens_attr]
#[proc_macro_attribute]
pub fn repo_impl(attrs: TokenStream, input: TokenStream) -> TokenStream {
    crate::repos::repo_impl(attrs, input)
}

/// **Internal. Do not use unless you know what you are doing**
/// Create the methods that will return the builders and packages
/// Usage:
/// ```
/// #[::bok_macro::repo_impl_methods(MyRepo)]
/// impl MyRepo{}
/// ```
#[::macro_magic::import_tokens_attr]
#[proc_macro_attribute]
pub fn repo_impl_methods(
    attrs: TokenStream,
    input: TokenStream,
) -> TokenStream {
    crate::repos::repo_impl_methods(attrs, input, __source_path)
}

/// **Internal. Do not use unless you know what you are doing**
/// given a Repository and a trait "BokDeps...",
/// implement all the fn returning the dependencies needed by the package
///
/// Usage:
/// ```
/// #[::bok_macro::repo_impl_(MyRepo)]
/// impl MyRepo{}
/// ```
#[::macro_magic::import_tokens_attr]
#[proc_macro_attribute]
pub fn repo_impl_pkg_deps(
    attrs: TokenStream,
    input: TokenStream,
) -> TokenStream {
    crate::repos::repo_impl_pkg_deps(attrs, input)
}

/// **Internal**
///
/// add implementation of a collection
#[proc_macro_attribute]
pub fn collection(attrs: TokenStream, input: TokenStream) -> TokenStream {
    crate::collection::collection(attrs, input)
}

/// **Internal**
///
/// add implementation of a `BokBuilderDeps` trait
#[::macro_magic::import_tokens_attr]
#[proc_macro_attribute]
pub fn collection_dep(attrs: TokenStream, input: TokenStream) -> TokenStream {
    crate::collection::collection_dep(attrs, input, __source_path)
}

//
// ####### Package stuff ##########
//

/// Use on a function as `#[::bok::pkg_fn_to_code]`
/// will create a new function, same name with `_code` that
/// returns the ::proc_macro2::TokenStream of the function
///
/// **Don't use this if you are using `#[::bok::package(...)]`
///  it is already automatically added to all members of trait `::bok::Pkg`**
///
/// e.g.:
/// ```
/// impl MyPackage {
///   #[::bok::pkg_fn_to_code]
///   fn build() {
///     ...
///   }
/// }
/// let p = MyPackage::default();
/// let tokens : ::proc_macro2::TokenStream = p.build_code()
/// ```
#[proc_macro_attribute]
pub fn pkg_fn_to_code(attrs: TokenStream, input: TokenStream) -> TokenStream {
    crate::pkgs::pkg_fn_to_code(attrs, input)
}

/// Use as #[::bok::package(MyBasePackage)]
/// Will setup a `base` field that is the given base package
/// and add `#[derive(::bok::Package)]`
///
/// e.g.:
/// ```
/// #[::bok::package(::bok::PkgEmpty)]
/// pub struct MyPkg {}
/// ```
#[proc_macro_attribute]
pub fn package(attrs: TokenStream, input: TokenStream) -> TokenStream {
    crate::pkgs::package(attrs, input)
}

/// **Internal**. try not to use
/// Use as #[::bok::package(MyBasePackage<R>)]
/// Will setup a `base` field that is the given base package
/// and add `#[derive(::bok::Package)]`
/// needs generics
///
/// e.g.:
/// ```
/// #[::bok::package_path(::base::pkg<R>)]
/// pub struct MyPkg {}
/// ```
#[::macro_magic::import_tokens_attr]
#[proc_macro_attribute]
pub fn package_path(attrs: TokenStream, input: TokenStream) -> TokenStream {
    crate::pkgs::package_path(attrs, input, __source_path)
}

/// Specify one or more dependencies
///
/// e.g:
/// ```
/// #[::bok::package(::bok::PkgEmpty)]
/// #[::bok::deps(some::Package, other::Package)]
/// pub struct MyPkg {}
/// ```
#[proc_macro_attribute]
pub fn deps(attrs: TokenStream, input: TokenStream) -> TokenStream {
    crate::pkgs::deps(attrs, input)
}

/*
/// attribute for package optional feature fields
/// marks a struct field as a package option
/// the PkgBuilder will create apposite get/set and traits for the options
///
/// e.g:
/// ```
/// #[::bok::package(::bok::PkgEmpty)]
/// pub struct MyPkg {
///     #[::bok::option]
///     with_ssl: bool,
/// }
/// ```
#[proc_macro_attribute]
pub fn option(attrs: TokenStream, input: TokenStream) -> TokenStream {
    crate::pkgs::option(attrs, input)
}
*/

/// Use as #[::bok::package_impl]
/// adds the right generics to the package.
///
/// extra calls and changes are added to `::bok::Pkg` and ::std::Default traits
///
/// e.g.:
/// ```
/// #[::bok::package_impl]
/// impl Default for Mypackage {
///   fn default() -> Self { ... }
/// }
/// #[::bok::package_impl]
/// impl ::bok::Pkg for MyPackage {
///   fn build(&self) -> Result<(),()> {
///       ...
///   }
/// }
/// ```
#[proc_macro_attribute]
pub fn package_impl(attrs: TokenStream, input: TokenStream) -> TokenStream {
    crate::pkgs::package_impl(attrs, input)
}

/// ** Internal, don't use unless you know what you are doing.**
/// Use as #[::bok::package_impl_base(::my::Package)]
/// implements common ::bok::Pkg methods and takes the package methods
/// not implemented by the user from the base package
///
/// does not export symbols.
///
/// should be called with the same path as the package that implements
/// ::bok::Pkg
///
/// will rewrite itself with the exported impl path of the base package
/// so that macro_magic can import the base impl
///
/// e.g.:
/// ```
/// #[::bok::package_impl_base(MyPackage)]
/// #[::macro_magic::export_tokens(_bok_pkg_mypackage)]
/// impl ::bok::Pkg for MyPackage {
///   fn build(&self) -> Result<(),()> {
///       ...
///   }
/// }
/// ```
#[::macro_magic::import_tokens_attr]
#[proc_macro_attribute]
pub fn package_impl_base(
    attrs: TokenStream,
    input: TokenStream,
) -> TokenStream {
    crate::pkgs::package_impl_base(attrs, input)
}

/// ** Internal, don't use unless you know what you are doing.**
/// Use as #[::bok::package_impl_builder(::my::Package)]
/// implements common ::bok::PkgBuilder methods and takes
/// the package methods not implemented by the user from the base package
///
/// does not export symbols.
///
/// should be called with the same path as the package that implements
/// ::bok::Pkg
///
/// will rewrite itself with the exported impl path of the base package
/// so that macro_magic can import the base impl
///
/// e.g.:
/// ```
/// #[::bok::package_impl_builder(MyPackage)]
/// #[::macro_magic::export_tokens(_bok_pkgbuilder_mypackage)]
/// impl ::bok::PkgBuilder for MyPackage {
///   fn set_dependencies(&self, ...) -> Result<(),()> {
///       ...
///   }
/// }
/// ```
#[::macro_magic::import_tokens_attr]
#[proc_macro_attribute]
pub fn package_impl_builder(
    attrs: TokenStream,
    input: TokenStream,
) -> TokenStream {
    crate::pkgs::package_impl_builder(attrs, input, __source_path)
}

/// Unless you know what you are doing, use `#[::bok::package(MyBasePackage)]`
/// instead needs a `.base` field
///
/// ```
/// #[derive(::bok::Package)]
/// pub struct MyPkg {
///   base: OtherPkg
/// }
/// ```
/// adds:
/// * Builder pattern to a package
/// * getters/setters for all package fields
/// * deref for package
#[proc_macro_derive(Package, attributes(option))]
pub fn derive_package(input: TokenStream) -> TokenStream {
    crate::pkgs::derive_package(input)
}

// ==== Common package stuff ====

pub(crate) struct PathList(Vec<::syn::Path>);

impl ::syn::parse::Parse for PathList {
    fn parse(input: ::syn::parse::ParseStream) -> syn::Result<Self> {
        use ::syn::punctuated::Punctuated;
        let raw =
            Punctuated::<::syn::Path, ::syn::Token![,]>::parse_terminated(
                input,
            )?;
        let mut result = Vec::with_capacity(raw.len());
        for r in raw.into_iter() {
            result.push(r)
        }
        Ok(PathList(result))
    }
}