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use std::collections::HashMap;
use flag::Flag;


/// Sub command
#[derive(Debug, Clone)]
pub struct Command {
    name: String,
    values: Vec<String>,
    flags: HashMap<String, Flag>
}

impl Command {
    /// Create a sub command
    pub fn new(name: String) -> Command {
        Command {
            name: name,
            values: Vec::new(),
            flags: HashMap::new()
        }
    }

    /// Set sub command's flags
    pub fn set_flags(&mut self, flags: HashMap<String, Flag>) {
        self.flags = flags;
    }

    /// Set sub command's value
    pub fn add_value(&mut self, value: String) {
        self.values.push(value);
    }

    /// Get a flag by flag names
    pub fn get_flag<T: AsRef<str>>(&self, names: &[T]) -> Option<Flag> {
        for name in names.into_iter() {
            let flag = self.flags.get(name.as_ref());
            if flag.is_some() {
                return flag.cloned();
            }
        }

        None
    }

    /// Get sub command's values
    pub fn get_value_array(&self) -> Option<Vec<String>> {
        if self.values.is_empty() {
            None
        } else {
            Some(self.values.clone())
        }
    }

    /// Get sub command's value
    pub fn get_value(&self) -> Option<String> {
        if self.values.is_empty() {
            None
        } else {
            Some(self.values.first().unwrap().clone())
        }
    }

    /// Get sub command's name
    pub fn get_name(&self) -> String {
        self.name.clone()
    }

    /// Add a flag to sub command
    pub fn add_flag(&mut self, name: String, value: Option<String>) {
        self.flags.insert(name.clone(), Flag::new(name, value));
    }
}