package obiseq

import (
	"context"
	"log"

	"github.com/PaesslerAG/gval"
)

type SequencePredicate func(*BioSequence) bool

func (predicate1 SequencePredicate) And(predicate2 SequencePredicate) SequencePredicate {
	f := func(sequence *BioSequence) bool {
		return predicate1(sequence) && predicate2(sequence)
	}

	return f
}

func (predicate1 SequencePredicate) Or(predicate2 SequencePredicate) SequencePredicate {
	f := func(sequence *BioSequence) bool {
		return predicate1(sequence) || predicate2(sequence)
	}

	return f
}

func (predicate1 SequencePredicate) Xor(predicate2 SequencePredicate) SequencePredicate {
	f := func(sequence *BioSequence) bool {
		p1 := predicate1(sequence)
		p2 := predicate2(sequence)
		return (p1 && !p2) || (p2 && !p1)
	}

	return f
}

func (predicate1 SequencePredicate) Not() SequencePredicate {
	f := func(sequence *BioSequence) bool {
		return !predicate1(sequence)
	}

	return f
}

func HasAttribute(name string) SequencePredicate {

	f := func(sequence *BioSequence) bool {
		if sequence.HasAnnotation() {
			_, ok := (sequence.Annotations())[name]
			return ok
		}

		return false
	}

	return f
}

func MoreAbundantThan(count int) SequencePredicate {
	f := func(sequence *BioSequence) bool {
		return sequence.Count() > count
	}

	return f
}

func IsLongerOrEqualTo(length int) SequencePredicate {
	f := func(sequence *BioSequence) bool {
		return sequence.Length() >= length
	}

	return f
}

func IsShorterOrEqualTo(length int) SequencePredicate {
	f := func(sequence *BioSequence) bool {
		return sequence.Length() <= length
	}

	return f
}

func ExrpessionPredicat(expression string) SequencePredicate {

	exp, err := gval.Full().NewEvaluable(expression)

	if err != nil {
		log.Fatalf("Error in the expression : %s", expression)
	}

	f := func(sequence *BioSequence) bool {
		value, err := exp.EvalBool(context.Background(),
			map[string]interface{}{
				"annot":    sequence.Annotations(),
				"count":    sequence.Count(),
				"length":   sequence.Length(),
				"sequence": sequence,
			},
		)

		if err != nil {
			log.Fatalf("Expression '%s' cannot be evaluated on sequence %s",
				expression,
				sequence.Id())
		}

		return value
	}

	return f
}