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use crate::{
    check_environment,
    error::{Error, ErrorExt},
    str_extension::StrExtension,
};
use std::{
    fmt::Display,
    str::{FromStr, SplitAsciiWhitespace},
};

pub type DomainName = String;

const ITEM: &str = "item";
const LIST: &str = "list";

#[derive(Debug, PartialEq)]
pub enum DomainCommand {
    /// # Example
    ///
    /// ```
    /// use transip_command::{DomainCommand, TransipCommand};
    ///
    /// let commandline = "domain list";
    /// assert_eq!(
    ///     commandline.parse::<TransipCommand>().unwrap(),
    ///     TransipCommand::Domain(DomainCommand::List),
    /// );
    /// ```
    List,

    /// # Example
    ///
    /// ```
    /// use transip_command::{DomainCommand, TransipCommand};
    ///
    /// let commandline = "domain item oiwerhy.nl";
    /// assert_eq!(
    ///     commandline.parse::<TransipCommand>().unwrap(),
    ///     TransipCommand::Domain(
    ///         DomainCommand::Item(
    ///             "oiwerhy.nl".to_owned(),
    ///         )
    ///     ),
    /// );
    /// ```
    Item(DomainName),
}

impl Display for DomainCommand {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            DomainCommand::Item(item) => write!(f, "{} {}", ITEM, item),
            DomainCommand::List => write!(f, "{}", LIST),
        }
    }
}

impl FromStr for DomainCommand {
    type Err = Error;

    fn from_str(s: &str) -> std::result::Result<Self, Self::Err> {
        if s.trim() == LIST {
            return Ok(DomainCommand::List);
        }
        if let Some(domain_name) = s.one_param(ITEM) {
            Ok(DomainCommand::Item(check_environment(domain_name)?))
        } else {
            Err(Error::ParseDomainCommand(s.to_owned()))
        }
    }
}

impl<'a> TryFrom<SplitAsciiWhitespace<'a>> for DomainCommand {
    type Error = Error;

    fn try_from(mut value: SplitAsciiWhitespace<'a>) -> Result<Self, Self::Error> {
        let first = value.next();
        if first == Some(LIST) {
            if value.next().is_none() {
                return Ok(DomainCommand::List);
            } else {
                return Err(Error::ParseDomainCommand(
                    "domain item takes no parameters".to_owned(),
                ));
            }
        }
        if first == Some(ITEM) {
            let second = value
                .next()
                .ok_or(Error::ParseDnsCommand("no domain name".to_owned()))?;
            if value.next().is_none() {
                return check_environment(second)
                    .err_into()
                    .map(DomainCommand::Item);
            } else {
                return Err(Error::ParseDomainCommand(
                    "domain item takes 1 parameter only".to_owned(),
                ));
            }
        }
        Err(Error::ParseDomainCommand(
            "unknown subcommand for domain. Please use list or item".to_owned(),
        ))
    }
}

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

    #[test]
    fn display() {
        assert_eq!(
            DomainCommand::Item("paulmin.nl".to_owned()).to_string(),
            "item paulmin.nl".to_owned(),
        );

        assert_eq!(DomainCommand::List.to_string(), "list".to_owned(),);
    }

    #[test]
    fn try_from() {
        assert_eq!(
            DomainCommand::try_from("  item   paulmin.nl   ".split_ascii_whitespace()).unwrap(),
            DomainCommand::Item("paulmin.nl".to_owned())
        );
    }

    #[test]
    fn from_str() {
        assert_eq!(
            "list".parse::<DomainCommand>().unwrap(),
            DomainCommand::List,
        );

        assert_eq!(
            "item paulmin.nl".parse::<DomainCommand>().unwrap(),
            DomainCommand::Item("paulmin.nl".to_owned()),
        );
    }
}