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use quote::quote;
use proc_macro::TokenStream;



/// Macro which parses a hostname.
///
/// # Examples
///
/// ```
/// # #[macro_use] extern crate prefab_macro;
/// # use prefab_macro::*;
/// # use prefab_core::*;
/// #
/// # fn main() {
/// let address: Address = hostname!("host.example.com");
/// let address = hostname!("example.com");
/// # }
/// ```
/// 
/// Won't compile:
/// ```compile_fail
/// # #[macro_use] extern crate prefab_macro;
/// # use prefab_macro::*;
/// # use prefab_core::*;
/// #
/// # fn main() {
/// let address = hostname!("example com");
/// # }
/// ```
#[proc_macro] pub fn hostname(input: TokenStream) -> TokenStream {
    
    let string = extract_string(input);
    
    assert!(string.contains(" ") == false, "Hostname may not contain spaces."); //TODO expand checks; maybe split off fqdn!(), domain!()
    
    let tokens = quote! {
        Address::Name(
            #string.to_string()
        )
    };
    
    tokens.into()
}



/// Macro which parses an IPv4 address.
///
/// # Examples
///
/// ```
/// # #[macro_use] extern crate prefab_macro;
/// # use prefab_macro::*;
/// # use prefab_core::*;
/// #
/// # fn main() {
/// let address: Address = ip4!("127.0.0.1");
/// let address = ip4!("255.255.255.255");
/// # }
/// ```
/// 
/// Won't compile:
/// ```compile_fail
/// # #[macro_use] extern crate prefab_macro;
/// # use prefab_macro::*;
/// # use prefab_core::*;
/// #
/// # fn main() {
/// let address = ip4!("1277.0.0.1");
/// # }
/// ```
#[proc_macro] pub fn ip4(input: TokenStream) -> TokenStream {
    
    let string = extract_string(input);
    
    string.parse::<std::net::Ipv4Addr>().expect("Failed to parse as IPv4"); //check that it can be parsed
    
    
    let tokens = quote! {
        Address::Ip4(
            #string.parse::<std::net::Ipv4Addr>().unwrap()
        )
    };
    
    tokens.into()
}



/// Macro which parses an IPv6 address.
///
/// # Examples
///
/// ```
/// # #[macro_use] extern crate prefab_macro;
/// # use prefab_macro::*;
/// # use prefab_core::*;
/// #
/// # fn main() {
/// let address: Address = ip6!("::1");
/// let address = ip6!("2001:db8::");
/// # }
/// ```
/// 
/// Won't compile:
/// ```compile_fail
/// # #[macro_use] extern crate prefab_macro;
/// # use prefab_macro::*;
/// # use prefab_core::*;
/// #
/// # fn main() {
/// let address = ip6!("2001:dn8::");
/// # }
/// ```
#[proc_macro] pub fn ip6(input: TokenStream) -> TokenStream {
    
    let string = extract_string(input);
    
    string.parse::<std::net::Ipv6Addr>().expect("Failed to parse as IPv6"); //check that it can be parsed
    
    
    let tokens = quote! {
        Address::Ip6(
            #string.parse::<std::net::Ipv6Addr>().unwrap()
        )
    };
    
    tokens.into()
}


/// Macro which parses a URL.
///
/// # Examples
///
/// ```
/// # #[macro_use] extern crate prefab_macro;
/// # use prefab_macro::*;
/// # use prefab_core::*;
/// # use url::Url;
/// #
/// # fn main() {
/// let url: Url = url!("https://example.com");
/// let url = url!("ftp://127.0.0.1:45");
/// # }
/// ```
/// 
/// Won't compile:
/// ```compile_fail
/// # #[macro_use] extern crate prefab_macro;
/// # use prefab_macro::*;
/// # use prefab_core::*;
/// #
/// # fn main() {
/// let url = url!("https://example com");
/// # }
/// ```
#[proc_macro] pub fn url(input: TokenStream) -> TokenStream {
    
    let string = extract_string(input);
    
    
    url::Url::parse(&string).expect("Failed to parse as URL"); //check that it can be parsed
    
    
    let tokens = quote! {
        url::Url::parse(&#string).unwrap()
    };
    
    tokens.into()
}



fn extract_string(input: TokenStream) -> String {
    let string = input.to_string();
    let string = &string[1..string.len()-1]; //remove quotation marks, assuming user entered a correct string
    
    string.to_string()
}