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//
// Wildland Project
//
// Copyright © 2022 Golem Foundation,
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 3 as published by
// the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

use crate::binding_types::{ExternFunction, RustWrapperType, WrapperType};
use crate::extern_module_translator::Exceptions;

pub fn create_extern_imports(extern_functions: &[ExternFunction]) -> String {
    extern_functions
        .iter()
        .map(|function| {
            let args = function
                .arguments
                .iter()
                .map(|arg| match arg {
                    WrapperType {
                        wrapper_name,
                        rust_type: RustWrapperType::Primitive,
                        reference_parameters: None,
                        ..
                    } => wrapper_name.clone(),
                    WrapperType {
                        wrapper_name,
                        rust_type:
                            RustWrapperType::FieldlessEnum
                            | RustWrapperType::Exceptions(Exceptions::Primitive(_)),
                        reference_parameters: None,
                        ..
                    } => format!("enum {}", wrapper_name.clone()),
                    _ => "void*".to_owned(),
                })
                .collect::<Vec<String>>()
                .join(", ");
            let function_name = &function.name;
            let return_type = match &function.return_type {
                Some(WrapperType {
                    wrapper_name,
                    rust_type: RustWrapperType::Primitive,
                    reference_parameters: None,
                    ..
                }) => wrapper_name.clone(),
                Some(WrapperType {
                    wrapper_name,
                    rust_type: RustWrapperType::FieldlessEnum,
                    reference_parameters: None,
                    ..
                }) => format!("enum {}", wrapper_name.clone()),
                Some(WrapperType { .. }) => "void*".to_owned(),
                _ => "void".to_owned(),
            };
            format!("{return_type} {function_name}({args});\n")
        })
        .collect::<String>()
}

#[cfg(test)]

mod tests {
    use pretty_assertions::assert_eq;
    use syn::parse_quote;

    use super::*;

    #[test]
    fn should_create_function_returning_void() {
        let function_without_return_type = ExternFunction {
            arguments: vec![],
            return_type: None,
            name: "foo".to_owned(),
            tokens: parse_quote!(
                fn foo();
            ),
        };
        let result = create_extern_imports(&[function_without_return_type]);
        let expected = "void foo();\n";
        assert_eq!(result, expected);
    }

    #[test]
    fn should_create_function_returning_primitive() {
        let function_returning_primitive = ExternFunction {
            arguments: vec![],
            return_type: Some(WrapperType {
                original_type_name: parse_quote!(u32),
                wrapper_name: "u32".to_string(),
                rust_type: RustWrapperType::Primitive,
                reference_parameters: None,
            }),
            name: "foo".to_owned(),
            tokens: parse_quote!(
                fn foo();
            ),
        };
        let result = create_extern_imports(&[function_returning_primitive]);
        let expected = "u32 foo();\n";
        assert_eq!(result, expected);
    }

    #[test]
    fn should_create_function_returning_fieldless_enum() {
        let function_returning_fieldless_enum = ExternFunction {
            arguments: vec![],
            return_type: Some(WrapperType {
                original_type_name: parse_quote!(SomeEnum),
                wrapper_name: "SomeEnum".to_string(),
                rust_type: RustWrapperType::FieldlessEnum,
                reference_parameters: None,
            }),
            name: "foo".to_owned(),
            tokens: parse_quote!(
                fn foo() -> SomeEnum;
            ),
        };
        let result = create_extern_imports(&[function_returning_fieldless_enum]);
        let expected = "enum SomeEnum foo();\n";
        assert_eq!(result, expected);
    }

    #[test]
    fn should_create_function_returning_data_enum() {
        let function_returning_data_enum = ExternFunction {
            arguments: vec![],
            return_type: Some(WrapperType {
                original_type_name: parse_quote!(SomeDataEnum),
                wrapper_name: "SomeDataEnum".to_string(),
                rust_type: RustWrapperType::DataEnum,
                reference_parameters: None,
            }),
            name: "foo".to_owned(),
            tokens: parse_quote!(
                fn foo() -> SomeDataEnum;
            ),
        };
        let result = create_extern_imports(&[function_returning_data_enum]);
        let expected = "void* foo();\n";
        assert_eq!(result, expected);
    }

    #[test]
    fn should_create_function_returning_custom_type() {
        let function_returning_custom_type = ExternFunction {
            arguments: vec![],
            return_type: Some(WrapperType {
                original_type_name: parse_quote!(SomeCustomType),
                wrapper_name: "SomeCustomType".to_string(),
                rust_type: RustWrapperType::Custom,
                reference_parameters: None,
            }),
            name: "foo".to_owned(),
            tokens: parse_quote!(
                fn foo() -> SomeCustomType;
            ),
        };
        let result = create_extern_imports(&[function_returning_custom_type]);
        let expected = "void* foo();\n";
        assert_eq!(result, expected);
    }
}