1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130

use {
    super::{Gene, MutationLine, MutationNode, NODE_TYPES},
    rand::Rng,
};

pub enum Type {
    // Changes all kinds of values
    Strong,
    // Only cange values
    OnlyValues,
}

impl Gene {
    pub fn mutate(&self, mutation_type: &Type, mutation_level: i8) -> Self {
        let mut new_values = self.clone();
        if !self.validate() {
            panic!("Genes not valid. Can't mutate.");
        };
        // Mutate nodes.
        for (node_line_index, node_line) in self.node_dna.iter().enumerate() {
            for (node_index, node) in node_line.iter().enumerate() {
                new_values.node_dna[node_line_index][node_index] =
                    node.node_mutate(mutation_type, mutation_level);
            }
        }
        // Mutate lines.
        for (block_index, block) in self.line_dna.iter().enumerate() {
            for (node_point_index, node_point) in block.iter().enumerate() {
                for (line_index, line) in node_point.iter().enumerate() {
                    new_values.line_dna[block_index][node_point_index][line_index] =
                        line.line_mutate(mutation_type, mutation_level)
                }
            }
        }
        new_values.clone()
    }
}

impl MutationNode {
    fn node_mutate(self, mutation_type: &Type, mutation_level: i8) -> Self {
        match mutation_type {
            Type::Strong => {
                let invert_chance: i8 =
                    rand::thread_rng().gen_range(i8::min_value(), i8::max_value());
                if mutation_level > invert_chance {
                    let mut rng = rand::thread_rng();
                    *rng.choose(&NODE_TYPES).unwrap()
                } else {
                    self
                }
            }
            Type::OnlyValues => self,
        }
    }
}

// TODO Need more tests
impl MutationLine {
    fn line_mutate(self, mutation_type: &Type, mutation_level: i8) -> Self {
        match mutation_type {
            Type::Strong => {
                let invert_chance: i8 =
                    rand::thread_rng().gen_range(i8::min_value(), i8::max_value());
                if mutation_level > invert_chance {
                    let invert_chance_level_two: i8 =
                        rand::thread_rng().gen_range(i8::min_value(), i8::max_value());
                    if mutation_level > invert_chance_level_two {
                        let mut rng = rand::thread_rng();
                        let line_types = [
                            MutationLine::Pass,
                            MutationLine::Reset,
                            MutationLine::Multiply(
                                rand::thread_rng().gen_range(i8::min_value(), i8::max_value()),
                            ),
                            MutationLine::Divide(
                                rand::thread_rng().gen_range(i8::min_value(), i8::max_value()),
                            ),
                            MutationLine::Add(
                                rand::thread_rng().gen_range(i8::min_value(), i8::max_value()),
                            ),
                        ];
                        *rng.choose(&line_types).unwrap()
                    } else {
                        self.line_only_values_mutate(mutation_level)
                    }
                } else {
                    self
                }
            }
            Type::OnlyValues => {
                let invert_chance: i8 =
                    rand::thread_rng().gen_range(i8::min_value(), i8::max_value());
                if mutation_level > invert_chance {
                    self.line_only_values_mutate(mutation_level)
                } else {
                    self
                }
            }
        }
    }
    fn line_only_values_mutate(self, mutation_level: i8) -> Self {
        match self {
            MutationLine::Pass => MutationLine::Pass,
            MutationLine::Reset => MutationLine::Reset,
            MutationLine::Multiply(value) => {
                MutationLine::Multiply(rand_plus_or_minus(value, mutation_level))
            }
            MutationLine::Divide(value) => {
                MutationLine::Divide(rand_plus_or_minus(value, mutation_level))
            }
            MutationLine::Add(value) => {
                MutationLine::Add(rand_plus_or_minus(value, mutation_level))
            }
        }
    }
}

fn rand_plus_or_minus(value_one: i8, value_two: i8) -> i8 {
    if rand::thread_rng().gen_bool(0.5) {
        match value_one.checked_add(value_two) {
            Some(v) => v,
            None => value_one,
        }
    } else {
        match value_one.checked_sub(value_two) {
            Some(v) => v,
            None => value_one,
        }
    }
}