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use crate::world::place::PlaceData;
use crate::world::Demographics;
use rand::prelude::*;

pub fn generate(place: &mut PlaceData, rng: &mut impl Rng, _demographics: &Demographics) {
    place.name.replace_with(|_| name(rng));
}

fn name(rng: &mut impl Rng) -> String {
    match rng.gen_range(0..=7) {
        0 => format!("The {} {}", placement(rng), canyon_synonym(rng)),
        1 => format!("{} {}", cardinal_direction(rng), canyon_synonym(rng)),
        2 => format!("{} {}", adjective(rng), canyon_synonym(rng)),
        3 => format!("{} {} {}", adjective(rng), thing(rng), canyon_synonym(rng)),
        4..=5 => format!("{} {}", thing(rng), canyon_synonym(rng)),
        6..=7 => format!("{}'s {}", profession(rng), canyon_synonym(rng)),
        _ => unreachable!(),
    }
}

fn thing(rng: &mut impl Rng) -> &'static str {
    match rng.gen_range(0..=9) {
        0 => other_animal(rng),
        1..=4 => canyon_animal(rng),
        5 => enemy(rng),
        6 => food(rng),
        7 => profession(rng),
        8 => symbol(rng),
        9 => gem(rng),
        _ => unreachable!(),
    }
}

fn adjective(rng: &mut impl Rng) -> &'static str {
    #[rustfmt::skip]
    const ADJECTIVES: &[&str] = &[
        "Angry", "Awkward", "Bloated", "Driven", "Elegant", "Engorged",
        "Enchanted", "Gold", "Green", "Grey", "Grouchy", "Hallowed", "Happy",
        "Hidden", "Hungry", "Jovial", "Lone", "Lost", "Lucky", "Merry", "Moody",
        "Morose", "Quiet", "Red", "Sickly", "Silent", "Silver", "Slim",
        "Slender", "Solemn", "Starved", "Stoic", "Thirsty", "Wasted", "Wild",
        "White", "Yellow"
    ];
    ADJECTIVES[rng.gen_range(0..ADJECTIVES.len())]
}

fn canyon_synonym(rng: &mut impl Rng) -> &'static str {
    #[rustfmt::skip]
    const CANYON_SYNONYMS: &[&str] = &[
        // Doubling-up on some options to increase odds as per this discussion
        // `github.com/initiative-sh/initiative.sh/pull/313/files/2b3195490641b537abbaab23aa38e279a4fb1216#r1331670310`
        // Could use rand::distributions::WeightedIndex in future if desired.
        "Canyon", "Canyon", "Ravine", "Ravine", "Gorge", "Gorge", "Crevice",
        "Gap", "Abyss", "Flume", "Fissure", "Trench"
    ];
    CANYON_SYNONYMS[rng.gen_range(0..CANYON_SYNONYMS.len())]
}

fn other_animal(rng: &mut impl Rng) -> &'static str {
    #[rustfmt::skip]
    const LAND_ANIMALS: &[&str] = &[
        "Antelope", "Ape", "Baboon", "Bat", "Bear", "Beaver", "Bee", "Beetle",
        "Boar", "Cow", "Deer", "Dove", "Dragonfly", "Duck", "Elephant", "Elk",
        "Ermine", "Frog", "Goose", "Hart", "Hedgehog", "Heron", "Herring",
        "Horse", "Hound", "Lamb", "Leopard", "Lion", "Magpie", "Mole",
        "Panther", "Peacock", "Phoenix", "Porcupine", "Rat", "Raven",
        "Salamander", "Sheep", "Squid", "Squirrel", "Stag", "Stoat", "Stork",
        "Swan", "Tiger", "Toad", "Turkey", "Turtle", "Unicorn", "Weasel"
    ];
    LAND_ANIMALS[rng.gen_range(0..LAND_ANIMALS.len())]
}

fn canyon_animal(rng: &mut impl Rng) -> &'static str {
    #[rustfmt::skip]
    const CANYON_ANIMALS: &[&str] = &[
        "Camel", "Badger", "Scorpion", "Beetle", "Fox", "Gecko", "Viper",
        "Snake", "Vulture", "Condor", "Dog", "Donkey", "Mule", "Owl", "Hyena",
        "Coyote", "Lizard", "Cat", "Eagle", "Goat", "Ram", "Hawk", "Tortoise",
        "Hare", "Ram", "Pony", "Rabbit", "Wolf"
    ];
    CANYON_ANIMALS[rng.gen_range(0..CANYON_ANIMALS.len())]
}

fn enemy(rng: &mut impl Rng) -> &'static str {
    #[rustfmt::skip]
    const ENEMIES: &[&str] = &[
        "Angel", "Bandit", "Brigand", "Centaur", "Chimera", "Demon", "Devil",
        "Dragon", "Fairy", "Ghost", "Giant", "Goblin", "Gorgon", "Gremlin",
        "Hag","Harpy", "Hydra", "Imp", "Kappa", "Lich", "Manticore", "Minotaur",
        "Necromancer", "Oni", "Orc", "Peryton", "Pirate", "Roc", "Satyr",
        "Seraph", "Siren", "Sorcerer", "Sphinx", "Thief", "Trickster", "Troll",
        "Unicorn", "Vampire", "Werewolf", "Witch", "Wyvern", "Zombie",
    ];
    ENEMIES[rng.gen_range(0..ENEMIES.len())]
}

fn food(rng: &mut impl Rng) -> &'static str {
    #[rustfmt::skip]
    const FOODS: &[&str] = &[
        "Barley", "Barrel", "Beef", "Beer", "Bread", "Cask", "Cheese", "Hop",
        "Keg", "Malt", "Mead", "Meat", "Mutton", "Pint", "Pork", "Potatoes",
        "Rye", "Tun", "Veal", "Venison", "Vine",
    ];
    FOODS[rng.gen_range(0..FOODS.len())]
}

fn gem(rng: &mut impl Rng) -> &'static str {
    #[rustfmt::skip]
    const GEMS: &[&str] = &[
        "Amber", "Agate", "Amethyst", "Aquamarine", "Beryl", "Citrine",
        "Diamond", "Emerald", "Opal", "Quartz", "Sapphire", "Topaz"
    ];
    GEMS[rng.gen_range(0..GEMS.len())]
}

fn placement(rng: &mut impl Rng) -> &'static str {
    #[rustfmt::skip]
    const PLACEMENT: &[&str] = &["First", "Last"];
    PLACEMENT[rng.gen_range(0..PLACEMENT.len())]
}

fn cardinal_direction(rng: &mut impl Rng) -> &'static str {
    const CARDINAL_DIRS: &[&str] = &["North", "South", "East", "West"];
    CARDINAL_DIRS[rng.gen_range(0..CARDINAL_DIRS.len())]
}

fn profession(rng: &mut impl Rng) -> &'static str {
    #[rustfmt::skip]
    const PROFESSIONS: &[&str] = &[
        "Adventurer", "Baker", "Beggar", "Blacksmith", "Brewer", "Bricklayer",
        "Builder", "Butcher", "Carpenter", "Conjurer", "Cooper", "Diviner",
        "Enchanter", "Evoker", "Farrier", "Ferryman", "Fisherman", "Glazier",
        "Illusionist", "Knight", "Mage", "Magician", "Mason", "Miller",
        "Plumber", "Porter", "Printer", "Roper", "Sailor", "Shipwright",
        "Smith", "Soldier", "Waterman", "Warrior", "Wizard",
    ];
    PROFESSIONS[rng.gen_range(0..PROFESSIONS.len())]
}

fn symbol(rng: &mut impl Rng) -> &'static str {
    #[rustfmt::skip]
    const SYMBOLS: &[&str] = &[
        "Abbey", "Anchor", "Anvil", "Arrow", "Axe", "Belfry", "Bell", "Book",
        "Buckle", "Cap", "Castle", "Column", "Crescent", "Crown", "Drum",
        "Feather", "Foil", "Hammer", "Harp", "Harrow", "Helmet", "Horseshoe",
        "Key", "Lance", "Lance", "Locket", "Mace", "Mill", "Mitre", "Moon",
        "Nail", "Oar", "Phalactary", "Rake", "Rook", "Scale", "Sceptre",
        "Scythe", "Ship", "Shovel", "Spear", "Spur", "Star", "Steeple", "Sun",
        "Sword", "Thunderbolt", "Tower", "Trumpet", "Wand", "Wheel",
    ];
    SYMBOLS[rng.gen_range(0..SYMBOLS.len())]
}

#[cfg(test)]
mod test {
    use super::*;

    #[test]
    fn name_test() {
        let mut rng = SmallRng::seed_from_u64(4);

        #[rustfmt::skip]
        assert_eq!(
            ["Printer Gorge", "Viper Gorge", "The Last Flume", "West Fissure",
             "Mage Canyon", "The First Crevice", "Tortoise Fissure",
             "Badger Fissure", "Rye Ravine", "Porter's Fissure", "Ram Gorge",
             "Cooper's Fissure", "Evoker's Abyss", "Porter's Ravine",
             "Keg Flume", "Smith's Ravine", "Rabbit Trench", "Grey Pork Flume",
             "Plumber Canyon", "Gorgon Canyon"]
            .iter()
            .map(|s| s.to_string())
            .collect::<Vec<_>>(),
            (0..20).map(|_| name(&mut rng)).collect::<Vec<String>>(),
        );
    }
}