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#[derive(Debug)]
pub struct Protocol {
    pub name: String,
    pub copyright: Option<String>,
    pub description: Option<(String, String)>,
    pub interfaces: Vec<Interface>
}

impl Protocol {
    pub fn new(name: String) -> Protocol {
        Protocol {
            name: name,
            copyright: None,
            description: None,
            interfaces: Vec::new()
        }
    }
}

#[derive(Debug)]
pub struct Interface {
    pub name: String,
    pub version: u32,
    pub description: Option<(String, String)>,
    pub requests: Vec<Message>,
    pub events: Vec<Message>,
    pub enums: Vec<Enum>
}

impl Interface {
    pub fn new() -> Interface {
        Interface {
            name: String::new(),
            version: 1,
            description: None,
            requests: Vec::new(),
            events: Vec::new(),
            enums: Vec::new()
        }
    }

    pub fn destructor_sanitize(&self) -> Result<bool, String> {
        let mut found_destructor = false;
        for req in &self.requests {
            if req.name == "destroy" {
                if let Some(Type::Destructor) = req.typ {
                    // all is good
                } else {
                    return Err(format!(
                        "Request '{}.destroy' is not a destructor.",
                        self.name
                    ))
                }
            }
            if let Some(Type::Destructor) = req.typ {
                // sanity checks
                if req.args.len() > 0 {
                    return Err(format!(
                        "Destructor request '{}.{}' cannot take arguments.",
                        self.name, req.name
                    ))
                }
                if found_destructor {
                    return Err(format!(
                        "Interface {} has more than one destructor.",
                        self.name
                    ))
                }
                found_destructor = true
            }
        }
        Ok(found_destructor)
    }
}

#[derive(Debug)]
pub struct Message {
    pub name: String,
    pub typ: Option<Type>,
    pub since: u16,
    pub description: Option<(String, String)>,
    pub args: Vec<Arg>,
    pub type_index: usize
}

impl Message {
    pub fn new() -> Message {
        Message {
            name: String::new(),
            typ: None,
            since: 1,
            description: None,
            args: Vec::new(),
            type_index: 0
        }
    }

    pub fn all_null(&self) -> bool {
        self.args.iter().all(|a| !((a.typ == Type::Object || a.typ == Type::NewId) && a.interface.is_some()))
    }
}

#[derive(Debug)]
pub struct Arg {
    pub name: String,
    pub typ: Type,
    pub interface: Option<String>,
    pub summary: Option<String>,
    pub description: Option<(String, String)>,
    pub allow_null: bool,
    pub enum_: Option<String>
}

impl Arg {
    pub fn new() -> Arg {
        Arg {
            name: String::new(),
            typ: Type::Object,
            interface: None,
            summary: None,
            description: None,
            allow_null: false,
            enum_: None,
        }
    }
}

#[derive(Debug)]
pub struct Enum {
    pub name: String,
    pub since: u16,
    pub description: Option<(String, String)>,
    pub entries: Vec<Entry>,
    pub bitfield: bool
}

impl Enum {
    pub fn new() -> Enum {
        Enum {
            name: String::new(),
            since: 1,
            description: None,
            entries: Vec::new(),
            bitfield: false
        }
    }
}

#[derive(Debug)]
pub struct Entry {
    pub name: String,
    pub value: String,
    pub since: u16,
    pub description: Option<(String, String)>,
    pub summary: Option<String>
}

impl Entry {
    pub fn new() -> Entry {
        Entry {
            name: String::new(),
            value: "0".to_owned(),
            since: 1,
            description: None,
            summary: None,
        }
    }
}

#[derive(Debug,PartialEq,Eq,Copy,Clone)]
pub enum Type {
    Int,
    Uint,
    Fixed,
    String,
    Object,
    NewId,
    Array,
    Fd,
    Destructor
}

impl Type {
    pub fn nullable(&self) -> bool {
        match *self {
            Type::String | Type::Object | Type::NewId | Type::Array => true,
            _ => false
        }
    }

    pub fn rust_type(&self) -> &'static str {
        match *self {
            Type::Int => "i32",
            Type::Uint => "u32",
            Type::Fixed => "f64",
            Type::Array => "Vec<u8>",
            Type::Fd => "::std::os::unix::io::RawFd",
            Type::String => "String",
            Type::Object => "ProxyId",
            _ => "()"
        }
    }
}