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use crate::{check_environment, error::VpsCommandError, str_extension::Words};
use std::{fmt::Display, str::FromStr};
use strum::{Display, EnumString};

pub type VpsName = String;

const LIST: &str = "list";

#[derive(Debug, PartialEq, EnumString, Display)]
#[strum(serialize_all = "lowercase")]
pub enum VpsAction {
    Item,
    Lock,
    Unlock,
    Start,
    Stop,
    Reset,
}

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

    /// # Example
    ///
    /// ```
    /// use transip_command::{TransipCommand, VpsAction, VpsCommand};
    ///
    /// let commandline = "vps reset vps9374";
    /// assert_eq!(
    ///     commandline.parse::<TransipCommand>().unwrap(),
    ///     TransipCommand::Vps(
    ///         VpsCommand::Action(
    ///             "vps9374".to_owned(),
    ///             VpsAction::Reset,
    ///         )
    ///     ),
    /// );
    /// ```
    Action(VpsName, VpsAction),
}

impl Display for VpsCommand {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            VpsCommand::Action(name, action) => write!(f, "{} {}", action, name),
            VpsCommand::List => write!(f, "{}", LIST),
        }
    }
}

impl FromStr for VpsCommand {
    type Err = VpsCommandError;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        VpsCommand::try_from(Words::from(s))
    }
}

impl<'a> TryFrom<Words<'a>> for VpsCommand {
    type Error = VpsCommandError;

    fn try_from(mut words: Words<'a>) -> Result<Self, Self::Error> {
        let sub_command = words.next().ok_or(VpsCommandError::MissingSubCommand)?;

        if sub_command == LIST {
            return Ok(VpsCommand::List);
        }

        let action = sub_command.parse::<VpsAction>()?;
        let vps = words.next().ok_or(VpsCommandError::MissingSubCommand)?;
        if let Some(s) = words.rest() {
            Err(VpsCommandError::TooManyParameters(s.to_owned()))
        } else {
            Ok(VpsCommand::Action(check_environment(vps)?, action))
        }
    }
}

// impl FromStr for VpsCommand {
//     type Err = Error;

//     fn from_str(s: &str) -> std::result::Result<Self, Self::Err> {
//         if s.trim() == LIST {
//             return Ok(VpsCommand::List);
//         }

//         for action in [
//             VpsAction::Item,
//             VpsAction::Lock,
//             VpsAction::Reset,
//             VpsAction::Start,
//             VpsAction::Stop,
//             VpsAction::Unlock,
//         ] {
//             if let Some(vps_name) = s.one_param(action.to_string().as_str()) {
//                 return Ok(VpsCommand::Action(check_environment(vps_name)?, action));
//             }
//         }

//         Err(Error::ParseVpsCommand(s.to_owned()))
//     }
// }

#[cfg(test)]
mod test {
    use super::{VpsAction, VpsCommand};

    #[test]
    fn display() {
        assert_eq!(
            VpsCommand::Action("vps2".to_owned(), VpsAction::Start).to_string(),
            "start vps2".to_owned(),
        );

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