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use super::*;

#[derive(Debug, Clone)]
pub struct MethodSpec {
    pub modifiers: Modifiers,
    pub name: String,
    pub annotations: Vec<AnnotationSpec>,
    pub arguments: Vec<ArgumentSpec>,
    pub returns: Option<Type>,
    pub throws: Vec<ClassType>,
    pub elements: Elements,
}

impl MethodSpec {
    pub fn new(modifiers: Modifiers, name: &str) -> MethodSpec {
        MethodSpec {
            modifiers: modifiers,
            name: name.to_owned(),
            annotations: Vec::new(),
            arguments: Vec::new(),
            returns: None,
            throws: Vec::new(),
            elements: Elements::new(),
        }
    }

    pub fn push_annotation<A>(&mut self, annotation: A)
        where A: Into<AnnotationSpec>
    {
        self.annotations.push(annotation.into());
    }

    pub fn push_argument<A>(&mut self, argument: A)
        where A: Into<ArgumentSpec>
    {
        self.arguments.push(argument.into());
    }

    pub fn returns<T>(&mut self, returns: T)
        where T: Into<Type>
    {
        self.returns = Some(returns.into())
    }

    pub fn throws<T>(&mut self, throws: T)
        where T: Into<ClassType>
    {
        self.throws.push(throws.into())
    }

    pub fn push<E>(&mut self, element: E)
        where E: Into<Element>
    {
        self.elements.push(element);
    }
}

impl From<MethodSpec> for Element {
    fn from(value: MethodSpec) -> Element {
        let mut elements = Elements::new();

        for a in &value.annotations {
            elements.push(a);
        }

        let mut open = Statement::new();

        if !value.modifiers.is_empty() {
            open.push(value.modifiers);
            open.push(" ");
        }

        match value.returns {
            None => open.push("void "),
            Some(ref returns) => {
                open.push(returns);
                open.push(" ");
            }
        }

        open.push(value.name);
        open.push("(");

        if !value.arguments.is_empty() {
            open.push(join_statements(value.arguments, ", "));
        }

        open.push(")");

        if !value.throws.is_empty() {
            open.push(" throws ");

            let mut arguments = Statement::new();

            for throw in &value.throws {
                arguments.push(throw);
            }

            open.push(arguments.join(", "));
        }

        if !value.elements.is_empty() {
            open.push(" {");

            elements.push(open);
            elements.push_nested(value.elements.join(Spacing));
            elements.push("}");
        } else {
            open.push(";");

            elements.push(open);
        }

        elements.into()
    }
}