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use super::types::{Card, CardIndex, Cardinfo, Row};
use rand::{random, thread_rng, Rng};

use std::collections::{HashMap, HashSet};
fn get_unique_rand(base: u8, state: &mut HashSet<u8>) -> u8 {
    let current = base * 10 + thread_rng().gen_range(1, 9);
    if state.insert(current) {
        current
    } else {
        get_unique_rand(base, state)
    }
}
fn generate_row(prev_nums: &mut HashSet<u8>) -> [u8; 9] //{{{
{
    let mut a: [u8; 9] = [0; 9];
    let mut base: u8 = 0; //row base
    let mut num_spaces = 0; //max 4 spaces are allowed in a row
    let mut num_nums = 0; //max 5 numbers
    for i in &mut a {
        if !random::<bool>() && num_spaces < 4 {
            num_spaces += 1;
            *i = 0;
            base += 1;
            continue;
        }
        if num_nums < 5 {
            num_nums += 1;
            *i = get_unique_rand(base, prev_nums);
            base += 1;
            continue;
        }
        *i = 0;
        base += 1;
    }
    a
} //}}}
pub fn generate_card(id: u32) -> Card //{{{
{
    let mut row_state = HashSet::new();
    (
        id,
        generate_row(&mut row_state),
        generate_row(&mut row_state),
        generate_row(&mut row_state),
    )
} //}}}
pub fn generate_n_cards(n: u32) -> Vec<Card> //{{{
{
    let mut cards = vec![];
    for i in 0..n {
        cards.push(generate_card(i))
    }
    cards
} //}}}
pub fn index_cards(cards: &Vec<Card>) -> CardIndex //{{{
{
    let mut card_index: CardIndex = HashMap::new();
    cards.iter().for_each(|card| {
        //{{{ row 1
        card.1.iter().for_each(|&num| {
            if num == 0 {
                return;
            }
            let line = card_index.entry(num).or_default();
            line.push(Cardinfo {
                card_id: card.0,
                row: Row::R1,
            })
        }); //}}}
            //{{{ row 2
        card.2.iter().for_each(|&num| {
            if num == 0 {
                return;
            }
            let line = card_index.entry(num).or_default();
            line.push(Cardinfo {
                card_id: card.0,
                row: Row::R2,
            })
        }); //}}}
            //{{{ row 3
        card.3.iter().for_each(|&num| {
            if num == 0 {
                return;
            }
            let line = card_index.entry(num).or_default();
            line.push(Cardinfo {
                card_id: card.0,
                row: Row::R3,
            })
        }); //}}}
    });
    card_index
} //}}}
#[cfg(test)] //{{{
mod tests {
    use super::*;
    #[test]
    fn generate_row_4_zeros() //{{{
    {
        for _ in 1..1e5 as u32 {
            let row = generate_row(&mut HashSet::default());
            let mut zeros = 0;
            for &i in row.iter() {
                if i == 0 {
                    zeros += 1
                }
            }
            assert_eq!(zeros, 4);
        }
    } //}}}
    #[test]
    fn row_numbers_increment_by_10() //{{{
    {
        for _ in 1..1e5 as u32 {
            let row = generate_row(&mut HashSet::default());
            for _ in row.iter() {
                for (i, &v) in row.iter().enumerate() {
                    assert!((v as usize) > i * 10 || v == 0);
                    assert!((v as usize) < i * 10 + 10 || v == 0);
                }
            }
        }
    } //}}}
    #[test]
    #[ignore]
    fn examine_card() //{{{
    {
        println!("{:?}", generate_card(12));
    } //}}}
    #[test]
    #[allow(bad_style)]
    fn test_GenerateNCards() //{{{
    {
        assert_eq!(135, generate_n_cards(135).len())
    } //}}}
} //}}}