alex/beta-minecraft-rust

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use super::Block;

pub fn face(block: Block, metadata: u8, side: usize) -> (u8, bool) {
    let base = block.properties().map_or(0, |p| p.texture);
    let texture = match block {
        Block::GRASS => match side {
            0 => 2,
            1 => 0,
            _ => 3,
        },
        Block::LOG => match (side, metadata & 3) {
            (0 | 1, _) => 21,
            (_, 1) => 116,
            (_, 2) => 117,
            _ => 20,
        },
        Block::LEAVES if metadata & 3 == 1 => base + 80,
        Block::SAPLING => match metadata & 3 {
            1 => 63,
            2 => 79,
            _ => base,
        },
        Block::TALL_GRASS => match metadata {
            0 => base + 16,
            2 => base + 17,
            _ => base,
        },
        Block::CHEST => match side {
            0 | 1 => 25,
            3 => 27,
            _ => 26,
        },
        Block::CACTUS => match side {
            0 => 71,
            1 => 69,
            _ => 70,
        },
        Block::SANDSTONE => match side {
            0 => 208,
            1 => 176,
            _ => 192,
        },
        Block::SLAB | Block::DOUBLE_SLAB => match metadata {
            0 if side <= 1 => 6,
            0 => 5,
            1 => face(Block::SANDSTONE, 0, side).0,
            2 => 4,
            3 => 16,
            _ => 6,
        },
        Block::WOOL if metadata != 0 => {
            let color = !(metadata & 15);
            113 + ((color & 8) >> 3) + (color & 7) * 16
        }
        Block::CRAFTING_TABLE => match side {
            1 => 43,
            0 => 4,
            2 | 4 => 60,
            _ => 59,
        },
        Block::FURNACE | Block::LIT_FURNACE => match side {
            0 | 1 => 62,
            side if side == usize::from(metadata) && block == Block::LIT_FURNACE => 61,
            side if side == usize::from(metadata) => 44,
            _ => 45,
        },
        Block::DISPENSER => match side {
            0 | 1 => 62,
            side if side == usize::from(metadata) => 46,
            _ => 45,
        },
        Block::FARMLAND => match side {
            1 if metadata > 0 => 86,
            1 => 87,
            _ => 2,
        },
        Block::WHEAT => 88 + metadata.min(7),
        Block::BOOKSHELF if side <= 1 => 4,
        Block::TNT => match side {
            0 => 10,
            1 => 9,
            _ => 8,
        },
        Block::WOODEN_DOOR | Block::IRON_DOOR if side > 1 => {
            let state = super::shape::door_state(metadata);
            if (state == 0 || state == 2) ^ (side <= 3) {
                return (base, false);
            }
            let flip = (usize::from(state / 2)
                + ((side & 1) ^ usize::from(state))
                + usize::from((metadata & 4) / 4))
                & 1
                != 0;
            return (base - (metadata & 8) * 2, flip);
        }
        // `BlockCake`: the cut shows on the west side
        Block::CAKE => match side {
            0 => 124,
            1 => 121,
            4 if metadata > 0 => 123,
            _ => 122,
        },
        Block::JUKEBOX if side == 1 => base + 1,
        Block::PUMPKIN | Block::JACK_O_LANTERN => {
            let front = matches!((metadata, side), (2, 2) | (3, 5) | (0, 3) | (1, 4));
            match side {
                0 | 1 => 102,
                _ if front && block == Block::JACK_O_LANTERN => 120,
                _ if front => 119,
                _ => 118,
            }
        }
        Block::LOCKED_CHEST => match side {
            0 | 1 => base - 1,
            3 => base + 1,
            _ => base,
        },
        Block::BED if side == 0 => 4,
        Block::BED => {
            let facing = super::bed::BED_DIRECTION[super::bed::direction(metadata)][side];
            match (super::bed::is_head(metadata), facing) {
                (true, 2) => base + 18,
                (true, 4 | 5) => base + 17,
                (true, _) => base + 1,
                (false, 3) => base + 15,
                (false, 4 | 5) => base + 16,
                (false, _) => base,
            }
        }
        Block::PISTON | Block::STICKY_PISTON => match usize::from(metadata & 7) {
            facing if facing > 5 => base,
            facing if facing == side && metadata & 8 == 0 => base,
            facing if facing == side => 110,
            facing if facing ^ 1 == side => 109,
            _ => 108,
        },
        Block::PISTON_HEAD => match usize::from(metadata & 7) {
            facing if facing == side && metadata & 8 != 0 => 106,
            facing if facing == side || facing ^ 1 == side => 107,
            _ => 108,
        },
        Block::REPEATER | Block::POWERED_REPEATER => {
            let powered = block == Block::POWERED_REPEATER;
            match side {
                0 if powered => 99,
                0 => 115,
                1 if powered => 147,
                1 => 131,
                _ => 5,
            }
        }
        Block::RAIL if metadata >= 6 => base - 16,
        Block::POWERED_RAIL if metadata & 8 == 0 => base - 16,
        _ => base,
    };
    (texture, false)
}

pub fn inventory_face(block: Block, metadata: u8, side: usize) -> u8 {
    match (block, side) {
        (Block::GRASS, _) => 3,
        (Block::TALL_GRASS, _) => block.properties().map_or(0, |p| p.texture),
        (Block::PISTON | Block::STICKY_PISTON, 0) => 109,
        (Block::PISTON, 1) => 107,
        (Block::STICKY_PISTON, 1) => 106,
        (Block::PISTON | Block::STICKY_PISTON, _) => 108,
        (Block::FURNACE | Block::LIT_FURNACE | Block::DISPENSER, _) => face(block, 3, side).0,
        _ => face(block, metadata, side).0,
    }
}