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// SPDX-FileCopyrightText: 2022 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
// SPDX-FileContributor: Andrew Hayzen <andrew.hayzen@kdab.com>
//
// SPDX-License-Identifier: MIT OR Apache-2.0

pub mod field;
pub mod fragment;
pub mod invokable;
pub mod property;
pub mod qobject;
pub mod signals;

use crate::generator::rust::qobject::GeneratedRustQObject;
use crate::parser::Parser;
use quote::quote;
use syn::{Item, ItemMod, Result};

/// Representation of the generated Rust code for a QObject
pub struct GeneratedRustBlocks {
    /// Module for the CXX bridge with passthrough items
    pub cxx_mod: ItemMod,
    /// Any global extra items for the CXX bridge
    pub cxx_mod_contents: Vec<Item>,
    /// Any global passthrough items for the implementation
    pub cxx_qt_mod_contents: Vec<Item>,
    /// Ident of the namespace of the QObject
    pub namespace: String,
    /// Generated QObject blocks
    pub qobjects: Vec<GeneratedRustQObject>,
}

impl GeneratedRustBlocks {
    pub fn from(parser: &Parser) -> Result<GeneratedRustBlocks> {
        Ok(GeneratedRustBlocks {
            cxx_mod: parser.passthrough_module.clone(),
            cxx_mod_contents: vec![generate_include(parser)?],
            cxx_qt_mod_contents: parser.cxx_qt_data.uses.clone(),
            namespace: parser.cxx_qt_data.namespace.clone(),
            qobjects: parser
                .cxx_qt_data
                .qobjects
                .values()
                .map(GeneratedRustQObject::from)
                .collect::<Result<Vec<GeneratedRustQObject>>>()?,
        })
    }
}

/// Generate the include line for this parsed block
fn generate_include(parser: &Parser) -> Result<Item> {
    let import_path = format!("cxx-qt-gen/{}.cxxqt.h", parser.cxx_file_stem);

    syn::parse2(quote! {
        unsafe extern "C++" {
            include!(#import_path);
        }
    })
}

#[cfg(test)]
mod tests {
    use super::*;

    use crate::tests::{assert_tokens_eq, tokens_to_syn};

    #[test]
    fn test_generated_rust_blocks() {
        let module: ItemMod = tokens_to_syn(quote! {
            #[cxx_qt::bridge]
            mod ffi {
                #[cxx_qt::qobject]
                struct MyObject;
            }
        });
        let parser = Parser::from(module).unwrap();

        let rust = GeneratedRustBlocks::from(&parser).unwrap();
        assert_eq!(rust.cxx_mod.content.unwrap().1.len(), 0);
        assert_eq!(rust.cxx_mod_contents.len(), 1);
        assert_tokens_eq(
            &rust.cxx_mod_contents[0],
            quote! {
                unsafe extern "C++" {
                    include!("cxx-qt-gen/ffi.cxxqt.h");
                }
            },
        );
        assert_eq!(rust.cxx_qt_mod_contents.len(), 0);
        assert_eq!(rust.namespace, "");
        assert_eq!(rust.qobjects.len(), 1);
    }

    #[test]
    fn test_generated_rust_blocks_namespace() {
        let module: ItemMod = tokens_to_syn(quote! {
            #[cxx_qt::bridge(namespace = "cxx_qt")]
            mod ffi {
                #[cxx_qt::qobject]
                struct MyObject;
            }
        });
        let parser = Parser::from(module).unwrap();

        let rust = GeneratedRustBlocks::from(&parser).unwrap();
        assert_eq!(rust.cxx_mod.content.unwrap().1.len(), 0);
        assert_eq!(rust.cxx_mod_contents.len(), 1);
        assert_eq!(rust.cxx_qt_mod_contents.len(), 0);
        assert_eq!(rust.namespace, "cxx_qt");
        assert_eq!(rust.qobjects.len(), 1);
    }

    #[test]
    fn test_generated_rust_blocks_uses() {
        let module: ItemMod = tokens_to_syn(quote! {
            #[cxx_qt::bridge(namespace = "cxx_qt")]
            mod ffi {
                use std::collections::HashMap;

                #[cxx_qt::qobject]
                struct MyObject;
            }
        });
        let parser = Parser::from(module).unwrap();

        let rust = GeneratedRustBlocks::from(&parser).unwrap();
        assert_eq!(rust.cxx_mod.content.unwrap().1.len(), 0);
        assert_eq!(rust.cxx_mod_contents.len(), 1);
        assert_eq!(rust.cxx_qt_mod_contents.len(), 1);
        assert_eq!(rust.namespace, "cxx_qt");
        assert_eq!(rust.qobjects.len(), 1);
    }

    #[test]
    fn test_generated_rust_blocks_cxx_file_stem() {
        let module: ItemMod = tokens_to_syn(quote! {
            #[cxx_qt::bridge(cxx_file_stem = "my_object")]
            mod ffi {
                #[cxx_qt::qobject]
                struct MyObject;
            }
        });
        let parser = Parser::from(module).unwrap();

        let rust = GeneratedRustBlocks::from(&parser).unwrap();
        assert_eq!(rust.cxx_mod.content.unwrap().1.len(), 0);
        assert_eq!(rust.cxx_mod_contents.len(), 1);
        assert_tokens_eq(
            &rust.cxx_mod_contents[0],
            quote! {
                unsafe extern "C++" {
                    include!("cxx-qt-gen/my_object.cxxqt.h");
                }
            },
        );
        assert_eq!(rust.cxx_qt_mod_contents.len(), 0);
        assert_eq!(rust.namespace, "");
        assert_eq!(rust.qobjects.len(), 1);
    }
}