use std::collections::HashMap;

#[derive(Debug)]
enum Period {
    Daily(i32),
    Weekly(i32),
    Days(i32),
}

#[derive(Debug)]
enum ItemUsage {
    Singleton,
    Once,
    Periodic(Period),
    Infinite,
}

#[derive(Debug)]
enum ItemSize {
    None,
    Pack(i32),
    Grams(i32),
}

#[derive(Debug)]
struct PackageItem {
    name: String,
    size: ItemSize,
    count: i32,
    usage: ItemUsage,
}

impl PackageItem {
    fn new(name: String, size: ItemSize, count: i32, usage: ItemUsage) -> PackageItem {
        PackageItem {
            name: name,
            size: size,
            count: count,
            usage: usage,
        }
    }

    fn new_simple(name: String) -> PackageItem {
        PackageItem {
            name: name,
            size: ItemSize::None,
            count: 1,
            usage: ItemUsage::Singleton,
        }
    }
}

#[derive(Debug)]
enum TripItemStatus {
    Pending,
    Ready,
    Packed,
}

#[derive(Debug)]
struct TripItem<'a> {
    package_item: &'a PackageItem,
    status: TripItemStatus,
}

impl TripItem<'_> {
    fn from_package_item(package_item: &PackageItem) -> TripItem {
        TripItem {
            package_item: package_item,
            status: TripItemStatus::Pending,
        }
    }

    fn set_status(&mut self, status: TripItemStatus) {
        self.status = status;
    }
}

#[derive(Debug)]
struct PackageList {
    name: String,
    items: HashMap<String, PackageItem>,
}

#[derive(Debug)]
struct TripList<'a> {
    items: Vec<TripItem<'a>>,
}

impl<'a> TripList<'a> {
    fn from_package_list(list: &'a PackageList) -> TripList<'a> {
        let mut items = Vec::new();
        for (_, item) in &list.items {
            items.push(TripItem::from_package_item(item));
        }

        TripList { items: items }
    }
}

#[derive(Debug)]
struct Trip<'a> {
    name: String,
    date: String,
    list: TripList<'a>,
}

impl<'a> Trip<'a> {
    fn from_package_list(name: String, date: String, list: &'a PackageList) -> Trip<'a> {
        Trip {
            name: name,
            date: date,
            list: TripList::from_package_list(list),
        }
    }
}

fn main() {
    let items = vec![
        // Base
        PackageItem::new_simple(String::from("Rucksack")),
        PackageItem::new_simple(String::from("Regenhülle für Rucksack")),
        PackageItem::new_simple(String::from("Normale Schuhe")),
        //
        // Geld & Karten
        PackageItem::new_simple(String::from("Geld")),
        PackageItem::new_simple(String::from("Kreditkarte")),
        PackageItem::new_simple(String::from("Pass")),
        PackageItem::new_simple(String::from("Krankenversicherungskarte")),
        PackageItem::new_simple(String::from("Krankenversicherungskarte (Zusatz)")),
        PackageItem::new_simple(String::from("Auslandskrankenversicherungsnachweis")),
        PackageItem::new_simple(String::from("ADAC-Karte")),
        PackageItem::new_simple(String::from("Impfausweiß (EU)")),
        PackageItem::new_simple(String::from("Führerschein")),
        PackageItem::new_simple(String::from("Internationaler Führerschein")),
        //
        // Waschzeug
        PackageItem::new_simple(String::from("Waschbeutel")),
        PackageItem::new_simple(String::from("Sonnencreme")),
        PackageItem::new_simple(String::from("After-Sun")),
        PackageItem::new_simple(String::from("Nagelset")),
        PackageItem::new_simple(String::from("Rasurbox")),
        PackageItem::new_simple(String::from("Rasierer")),
        PackageItem::new(
            String::from("Ersatzklingen"),
            ItemSize::Pack(1),
            1,
            ItemUsage::Infinite,
        ),
        PackageItem::new_simple(String::from("Zahnbürste")),
        PackageItem::new(
            String::from("Zahnputztabletten"),
            ItemSize::None,
            1,
            ItemUsage::Periodic(Period::Daily(2)),
        ),
        PackageItem::new_simple(String::from("Deo")),
        PackageItem::new_simple(String::from("Duschgel / Shampoo")),
        //
        // Apotheke
        PackageItem::new(
            String::from("Blasenpflaster"),
            ItemSize::Pack(1),
            1,
            ItemUsage::Infinite,
        ),
        PackageItem::new(
            String::from("Erste-Hilfe-Set"),
            ItemSize::None,
            1,
            ItemUsage::Infinite,
        ),
        PackageItem::new(
            String::from("Paracetamol"),
            ItemSize::Pack(1),
            1,
            ItemUsage::Infinite,
        ),
        PackageItem::new(
            String::from("Autan"),
            ItemSize::Pack(1),
            1,
            ItemUsage::Infinite,
        ),
        PackageItem::new(
            String::from("Pflaster"),
            ItemSize::Pack(1),
            1,
            ItemUsage::Infinite,
        ),
        PackageItem::new(
            String::from("Zeckenkarte"),
            ItemSize::None,
            1,
            ItemUsage::Singleton,
        ),
        //
        // Badesachen
        PackageItem::new_simple(String::from("Badehose")),
        PackageItem::new_simple(String::from("Badehandtuch")),
        PackageItem::new_simple(String::from("Surfshirt (Lang)")),
        PackageItem::new_simple(String::from("Wasserschuhe")),
        //
        // Camping
        PackageItem::new_simple(String::from("Schlafsack")),
        PackageItem::new_simple(String::from("Zelt")),
        PackageItem::new_simple(String::from("Luftmatratze")),
        PackageItem::new_simple(String::from("Campingstuhl")),
        PackageItem::new_simple(String::from("Topf")),
        PackageItem::new_simple(String::from("Teller")),
        PackageItem::new_simple(String::from("Messer")),
        PackageItem::new_simple(String::from("Gabel")),
        PackageItem::new_simple(String::from("Löffel")),
        PackageItem::new_simple(String::from("Stirnlampe")),
        PackageItem::new_simple(String::from("Taschenlampe")),
        PackageItem::new_simple(String::from("Feuerzeug")),
        PackageItem::new_simple(String::from("Tasse")),
        PackageItem::new_simple(String::from("Grill")),
        PackageItem::new(
            String::from("Grillkohle"),
            ItemSize::Grams(1500),
            1,
            ItemUsage::Periodic(Period::Days(2)),
        ),
        PackageItem::new_simple(String::from("Campingkocher")),
        PackageItem::new(
            String::from("Campinggas"),
            ItemSize::Pack(1),
            1,
            ItemUsage::Periodic(Period::Days(3)),
        ),
        PackageItem::new_simple(String::from("Kaffeekochaufsatz")),
        PackageItem::new(
            String::from("Küchenrolle"),
            ItemSize::None,
            1,
            ItemUsage::Periodic(Period::Days(5)),
        ),
        PackageItem::new(
            String::from("Müllsäcke"),
            ItemSize::Pack(1),
            1,
            ItemUsage::Infinite,
        ),
        //
        // Essen
        PackageItem::new(
            String::from("Kaffee"),
            ItemSize::Grams(100),
            1,
            ItemUsage::Periodic(Period::Days(3)),
        ),
        //
        // Wanderzeug
        PackageItem::new_simple(String::from("Wanderschuhe")),
        PackageItem::new_simple(String::from("Trinkblase")),
        //
        // Klamotten
        PackageItem::new(String::from("Cap"), ItemSize::None, 1, ItemUsage::Singleton),
        PackageItem::new(
            String::from("Regenjacke"),
            ItemSize::None,
            1,
            ItemUsage::Singleton,
        ),
        PackageItem::new(
            String::from("Daunenjacke"),
            ItemSize::None,
            1,
            ItemUsage::Singleton,
        ),
        PackageItem::new(
            String::from("Pullover"),
            ItemSize::None,
            1,
            ItemUsage::Singleton,
        ),
        PackageItem::new(
            String::from("Lange Hose"),
            ItemSize::None,
            2,
            ItemUsage::Singleton,
        ),
        PackageItem::new(
            String::from("Kurze Hose"),
            ItemSize::None,
            1,
            ItemUsage::Singleton,
        ),
        PackageItem::new(
            String::from("Jogginghose"),
            ItemSize::None,
            1,
            ItemUsage::Singleton,
        ),
        PackageItem::new(
            String::from("Socken"),
            ItemSize::None,
            1,
            ItemUsage::Periodic(Period::Daily(1)),
        ),
        PackageItem::new(
            String::from("Unterhose"),
            ItemSize::None,
            1,
            ItemUsage::Periodic(Period::Daily(1)),
        ),
        PackageItem::new(
            String::from("T-Shirt"),
            ItemSize::None,
            1,
            ItemUsage::Periodic(Period::Days(2)),
        ),
        //
        // Misc
        PackageItem::new_simple(String::from("Trinkflasche")),
        PackageItem::new_simple(String::from("Ladegerät")),
        PackageItem::new_simple(String::from("Powerbank")),
        PackageItem::new_simple(String::from("Ersatzbrille")),
        PackageItem::new_simple(String::from("Sonnenbrille")),
        PackageItem::new_simple(String::from("Ohrenstöpsel")),
    ];

    let package_list_camping = PackageList {
        name: String::from("camping"),
        items: (0..items.len()).map(|i| i.to_string()).zip(items).collect(),
    };

    println!("Contents of package list {:?}:", package_list_camping.name);
    for item in &package_list_camping.items {
        println!("{:?}", item);
    }

    println!("\nNow we're starting an actual trip!");

    let mut trip = Trip::from_package_list(
        String::from("Campingtrip"),
        String::from("2021-09-06"),
        &package_list_camping,
    );

    println!(
        "\nPackage list for trip {:?} at {:?}:",
        trip.name, trip.date
    );
    for item in &trip.list.items {
        println!("{:?}", item);
    }

    trip.list.items[0].set_status(TripItemStatus::Ready);
    trip.list.items[1].set_status(TripItemStatus::Packed);
    for item in &trip.list.items {
        println!("{:?}", item);
    }
}