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use crate::template;

/// The scope of the generated secret
#[derive(Debug)]
pub enum Scope {
    AUTHENTICATION,
    IDENTIFICATION,
    RECOVERY,
}

impl Scope {
    /// The default [`template::Template`] for the given scope
    pub fn default_template(&self) -> template::Template {
        match self {
            Scope::AUTHENTICATION => template::Template::Long,
            Scope::IDENTIFICATION => template::Template::Name,
            Scope::RECOVERY => template::Template::Phrase,
        }
    }
}

/// Any error from parsing a Scope from a string
#[derive(Debug)]
pub enum ParseScopeError {
    Invalid,
}

impl std::str::FromStr for Scope {
    type Err = ParseScopeError;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        match s.to_uppercase().as_str() {
            "AUTHENTICATION" => Ok(Self::AUTHENTICATION),
            "IDENTIFICATION" => Ok(Self::IDENTIFICATION),
            "RECOVERY" => Ok(Self::RECOVERY),
            _ => Err(ParseScopeError::Invalid),
        }
    }
}

/// A custom scoper simply needs to return an ideally unique string per-scope
pub trait Scoper: std::fmt::Debug {
    fn scope(&self, s: Scope) -> String;
}

/// A generic [`Scoper`] that returns a key with suffix depending on the scope
#[derive(Debug)]
pub struct SimpleScoper {
    key: String,
}

impl SimpleScoper {
    /// A new SimpleScoper with a single key
    pub fn new(key: impl Into<String>) -> Self {
        Self { key: key.into() }
    }
}

impl Default for SimpleScoper {
    /// The default SimpleScoper uses the original masterpassword key
    fn default() -> Self {
        Self::new("com.lyndir.masterpassword")
    }
}

impl Scoper for SimpleScoper {
    fn scope(&self, s: Scope) -> String {
        match s {
            Scope::AUTHENTICATION => self.key.clone(),
            Scope::IDENTIFICATION => format!("{}.login", self.key),
            Scope::RECOVERY => format!("{}.answer", self.key),
        }
    }
}