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//  Copyright (C) 2015 Steven Allen
//
//  This file is part of gazetta.
//
//  This program is free software: you can redistribute it and/or modify it under the terms of the
//  GNU General Public License as published by the Free Software Foundation version 3 of the
//  License.
//
//  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
//  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
//  the GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License along with this program.  If
//  not, see <http://www.gnu.org/licenses/>.
//

use std::fmt;
use link::Link;
use util::BubbleResult;
use yaml::*;

#[derive(Debug, Clone)]
pub struct Person {
    pub name: String,
    pub email: Option<String>,
    pub photo: Option<String>,
    pub key: Option<Key>,
    pub nicknames: Vec<String>,
    pub also: Vec<Link>,
}

#[derive(Debug, Clone)]
pub struct Key {
    pub url: String,
    pub fingerprint: String,
}

impl Key {
    pub fn from_yaml(key: Yaml) -> Result<Self, &'static str> {
        match key {
            Yaml::Hash(mut key) => {
                Ok(Key {
                    url: match key.remove(&URL) {
                        Some(Yaml::String(url)) => url,
                        Some(..) => return Err("key url must be a string"),
                        None => return Err("key url missing"),
                    },
                    fingerprint: match key.remove(&FINGERPRINT) {
                        Some(Yaml::String(fprint)) => fprint,
                        Some(..) => return Err("key fingerprint must be a string"),
                        None => return Err("key fingerprint missing"),
                    },
                })
            }
            _ => Err("if specified, key must be a hash"),
        }
    }
}

impl fmt::Display for Person {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{}", self.name)?;
        if let Some(ref email) = self.email {
            write!(f, " <{}>", email)?;
        }
        Ok(())
    }
}

impl Person {
    pub fn from_yaml(person: Yaml) -> Result<Self, &'static str> {
        Ok(match person {
            Yaml::Hash(mut person) => {
                Person {
                    name: match person.remove(&NAME) {
                        Some(Yaml::String(name)) => name,
                        None => return Err("missing name"),
                        _ => return Err("name must be a string"),
                    },
                    photo: match person.remove(&PHOTO) {
                        Some(Yaml::String(photo)) => Some(photo),
                        None => None,
                        _ => return Err("if specified, photo must be a string"),
                    },
                    email: match person.remove(&EMAIL) {
                        Some(Yaml::String(email)) => Some(email),
                        None => None,
                        _ => return Err("if specified, email must be a string"),
                    },
                    nicknames: match person.remove(&NICKNAMES) {
                        Some(Yaml::String(nick)) => vec![nick],
                        Some(Yaml::Array(nicks)) => {
                            nicks.into_iter()
                                .map(|nick| match nick {
                                    Yaml::String(nick) => Ok(nick),
                                    _ => Err("nicknames must be strings"),
                                })
                                .collect::<Result<_, _>>()?
                        }
                        Some(..) => return Err("invalid nicknames value"),
                        None => vec![],
                    },
                    also: person.remove(&ALSO)
                        .map(Link::many_from_yaml)
                        .bubble_result()?
                        .unwrap_or_else(Vec::new),
                    key: person.remove(&KEY).map(Key::from_yaml).bubble_result()?,
                }
            }
            Yaml::String(name) => {
                Person {
                    name: name,
                    email: None,
                    key: None,
                    also: Vec::new(),
                    photo: None,
                    nicknames: Vec::new(),
                }
            }
            _ => return Err("invalid person"),
        })
    }
}