use rand::Rng;
use std::cmp::{max, min};

use crate::artifacts::Potion;
use crate::position::{HasPosition, Position};

pub struct Player {
    name: String,
    position: Position,
    life: i16,
    max_life: i16,
    gold: usize,
    experience: usize,
    inventory: Vec<Potion>,
}

impl Player {
    pub fn new(name: &str, max_life: i16) -> Player {
        Player {
            name: name.to_string(),
            position: Position::new(0, 0, 0),
            life: max_life,
            max_life,
            gold: 0,
            experience: 0,
            inventory: vec![],
        }
    }
    pub fn get_name(&self) -> String {
        self.name.clone()
    }
    pub fn change_life(&mut self, by: i16) {
        self.life = max(0, min(self.max_life, self.life + by));
    }
    pub fn get_life(&self) -> i16 {
        self.life
    }
    /// returns true if the player is dead (life <= 0)
    pub fn is_dead(&self) -> bool {
        self.life <= 0
    }
    /// returns true if the player's life is at maximum
    pub fn is_healthy(&self) -> bool {
        self.life == self.max_life
    }
    pub fn get_max_life(&self) -> i16 {
        self.max_life
    }

    /// add the given amount to the players gold stash
    pub fn retrieve_gold(&mut self, amount: usize) {
        self.gold += amount
    }

    /// return the size of the players gold stash
    pub fn get_gold(&self) -> usize {
        self.gold
    }

    pub fn gain_experience(&mut self, amount: usize) {
        self.experience += amount
    }

    pub fn get_experience(&self) -> usize {
        self.experience
    }

    pub fn damage(&self) -> usize {
        rand::thread_rng().gen_range(1..4)
    }

    pub fn add_to_inventory(&mut self, potion: &Potion) -> bool {
        if self.inventory.len() < 10 {
            self.inventory.push(*potion);
            true
        } else {
            false
        }
    }

    pub fn inventory_size(&self) -> usize {
        self.inventory.len()
    }

    pub fn consume_inventory(&mut self) -> usize {
        if self.is_healthy() {
            return 0;
        }
        if let Some(potion) = self.inventory.pop() {
            self.change_life(potion.get_health() as i16);
            return potion.get_health();
        }
        0
    }
}

impl HasPosition for Player {
    fn get_position(&mut self) -> &mut Position {
        &mut self.position
    }
    fn get_immutable_position(&self) -> &Position {
        &self.position
    }
}

#[test]
fn test_get_name() {
    let p = Player {
        name: "Teddy Tester".to_string(),
        position: Position::new(0, 1, 1),
        life: 5,
        max_life: 10,
        gold: 0,
        experience: 0,
        inventory: vec![],
    };
    assert_eq!(p.get_name(), "Teddy Tester");
}

#[test]
fn test_can_receive_gold() {
    let mut p = Player::new("Teddy Tester", 10);
    assert_eq!(p.get_gold(), 0);

    p.retrieve_gold(13);
    p.retrieve_gold(10);
    assert_eq!(p.get_gold(), 23);
}

#[test]
fn test_change_life() {
    let mut p = Player {
        name: "Teddy Tester".to_string(),
        position: Position::new(0, 1, 1),
        life: 5,
        max_life: 10,
        gold: 0,
        experience: 0,
        inventory: vec![],
    };
    assert_eq!(p.get_life(), 5);
    p.change_life(-2);
    assert_eq!(p.get_life(), 3);
    p.change_life(10);
    assert_eq!(p.get_life(), 10);
    p.change_life(-12);
    assert_eq!(p.get_life(), 0);
}

#[test]
fn player_can_move() {
    let mut p = Player::new("Teddy Tester", 10);
    assert_eq!(p.get_position(), &Position::new(0, 0, 0));
    p.get_position().change(1, 2);
    assert_eq!(p.get_position(), &Position::new(0, 1, 2));
    p.get_position().change(2, 1);
    assert_eq!(p.get_position(), &Position::new(0, 3, 3));
    p.get_position().set(1, 2, 3);
    p.get_position().change(2, 1);
    assert_eq!(p.get_position(), &Position::new(1, 4, 4));
    assert_eq!(p.get_immutable_position(), &Position::new(1, 4, 4));
}

#[test]
fn test_max_life() {
    let p = Player {
        name: "Teddy Tester".to_string(),
        position: Position::new(0, 1, 1),
        life: 5,
        max_life: 10,
        gold: 0,
        experience: 0,
        inventory: vec![],
    };
    assert_eq!(p.get_max_life(), 10);
}