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mod builder;

pub use self::builder::{
    Builder as ConfigBuilder, TryFromBuilderError as TryFromConfigBuilderError,
};

use crate::chromosome::Chromosome;
use crate::compete::CompeteDispatch;
use crate::crossover::CrossoverDispatch;
use crate::fitness::{Fitness, FitnessValue};
use crate::genotype::{Genotype, MultiDiscreteGenotype};
use crate::mutate::MutateDispatch;
use crate::strategy::evolve::EvolveBuilder;
use std::ops::Range;

#[derive(Clone, Debug)]
pub struct Config<G: Genotype, F: Fitness<Genotype = G>> {
    pub evolve_builder: EvolveBuilder<G, MutateDispatch, F, CrossoverDispatch, CompeteDispatch>,
    pub evolve_fitness_to_micro_second_factor: FitnessValue,
    pub rounds: usize,
    pub population_sizes: Vec<usize>,
    pub max_stale_generations_options: Vec<Option<usize>>,
    pub target_fitness_score_options: Vec<Option<FitnessValue>>,
    pub degeneration_range_options: Vec<Option<Range<f32>>>,
    pub mutates: Vec<MutateDispatch>,
    pub crossovers: Vec<CrossoverDispatch>,
    pub competes: Vec<CompeteDispatch>,
}

impl<G: Genotype, F: Fitness<Genotype = G>> Config<G, F> {
    pub fn builder() -> ConfigBuilder<G, F> {
        ConfigBuilder::new()
    }

    // order matters so keep close to build_genotype
    pub fn evolve_builder_for_chromosome(
        &self,
        chromosome: &Chromosome<MultiDiscreteGenotype>,
    ) -> EvolveBuilder<G, MutateDispatch, F, CrossoverDispatch, CompeteDispatch> {
        let genes = &chromosome.genes;

        self.evolve_builder
            .clone()
            .with_population_size(self.population_sizes[genes[0]])
            .with_max_stale_generations_option(self.max_stale_generations_options[genes[1]])
            .with_target_fitness_score_option(self.target_fitness_score_options[genes[2]])
            .with_degeneration_range_option(self.degeneration_range_options[genes[3]].clone())
            .with_mutate(self.mutates[genes[4]].clone())
            .with_crossover(self.crossovers[genes[5]].clone())
            .with_compete(self.competes[genes[6]].clone())
    }

    // order matters so keep close to evolve_builder_for_chromosome
    pub fn build_genotype(&self) -> MultiDiscreteGenotype {
        MultiDiscreteGenotype::builder()
            .with_allele_multi_values(vec![
                (0..self.population_sizes.len()).collect(),
                (0..self.max_stale_generations_options.len()).collect(),
                (0..self.target_fitness_score_options.len()).collect(),
                (0..self.degeneration_range_options.len()).collect(),
                (0..self.mutates.len()).collect(),
                (0..self.crossovers.len()).collect(),
                (0..self.competes.len()).collect(),
            ])
            .build()
            .unwrap()
    }
}

impl<G: Genotype, F: Fitness<Genotype = G>> TryFrom<ConfigBuilder<G, F>> for Config<G, F> {
    type Error = TryFromConfigBuilderError;

    fn try_from(builder: ConfigBuilder<G, F>) -> Result<Self, Self::Error> {
        if builder.evolve_builder.is_none() {
            Err(TryFromConfigBuilderError(
                "MetaConfig requires an EvolveBuilder",
            ))
        } else if builder
            .evolve_builder
            .as_ref()
            .map(|e| e.genotype.is_none())
            .unwrap()
        {
            Err(TryFromConfigBuilderError(
                "MetaConfig's EvolveBuilder requires a Genotype",
            ))
        } else if builder
            .evolve_builder
            .as_ref()
            .map(|e| e.fitness.is_none())
            .unwrap()
        {
            Err(TryFromConfigBuilderError(
                "MetaConfig's EvolveBuilder requires a Fitness",
            ))
        } else if builder.population_sizes.is_empty() {
            Err(TryFromConfigBuilderError(
                "MetaConfig requires at least one population_size",
            ))
        } else if builder
            .max_stale_generations_options
            .iter()
            .all(|o| o.is_none())
            && builder
                .target_fitness_score_options
                .iter()
                .all(|o| o.is_none())
        {
            Err(TryFromConfigBuilderError(
                "MetaConfig requires at least one max_stale_generations_option or target_fitness_score_option that is not None",
            ))
        } else if builder.degeneration_range_options.is_empty() {
            Err(TryFromConfigBuilderError(
                "MetaConfig requires at least one degeneration_range_option, None is allowed",
            ))
        } else if builder.mutates.is_empty() {
            Err(TryFromConfigBuilderError(
                "MetaConfig requires at least one Mutate strategy",
            ))
        } else if builder.crossovers.is_empty() {
            Err(TryFromConfigBuilderError(
                "MetaConfig requires at least one Crossover strategy",
            ))
        } else if builder.competes.is_empty() {
            Err(TryFromConfigBuilderError(
                "MetaConfig requires at least one Compete strategy",
            ))
        } else {
            Ok(Self {
                evolve_builder: builder.evolve_builder.unwrap(),
                evolve_fitness_to_micro_second_factor: builder
                    .evolve_fitness_to_micro_second_factor,
                rounds: builder.rounds,
                population_sizes: builder.population_sizes,
                max_stale_generations_options: builder.max_stale_generations_options,
                target_fitness_score_options: builder.target_fitness_score_options,
                degeneration_range_options: builder.degeneration_range_options,
                mutates: builder.mutates,
                crossovers: builder.crossovers,
                competes: builder.competes,
            })
        }
    }
}