/*
Copyright 2020 Cortex Labs, Inc.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package configreader

import (
	"github.com/cortexlabs/cortex/pkg/lib/cast"
	"github.com/cortexlabs/cortex/pkg/lib/errors"
)

type Float64ListValidation struct {
	Required          bool
	Default           []float64
	AllowExplicitNull bool
	AllowEmpty        bool
	CastSingleItem    bool
	MinLength         int
	MaxLength         int
	InvalidLengths    []int
	Validator         func([]float64) ([]float64, error)
}

func Float64List(inter interface{}, v *Float64ListValidation) ([]float64, error) {
	casted, castOk := cast.InterfaceToFloat64Slice(inter)
	if !castOk {
		if v.CastSingleItem {
			castedItem, castOk := cast.InterfaceToFloat64(inter)
			if !castOk {
				return nil, ErrorInvalidPrimitiveType(inter, PrimTypeFloat, PrimTypeFloatList)
			}
			casted = []float64{castedItem}
		} else {
			return nil, ErrorInvalidPrimitiveType(inter, PrimTypeFloatList)
		}
	}
	return ValidateFloat64ListProvided(casted, v)
}

func Float64ListFromInterfaceMap(key string, iMap map[string]interface{}, v *Float64ListValidation) ([]float64, error) {
	inter, ok := ReadInterfaceMapValue(key, iMap)
	if !ok {
		val, err := ValidateFloat64ListMissing(v)
		if err != nil {
			return nil, errors.Wrap(err, key)
		}
		return val, nil
	}
	val, err := Float64List(inter, v)
	if err != nil {
		return nil, errors.Wrap(err, key)
	}
	return val, nil
}

func ValidateFloat64ListMissing(v *Float64ListValidation) ([]float64, error) {
	if v.Required {
		return nil, ErrorMustBeDefined()
	}
	return validateFloat64List(v.Default, v)
}

func ValidateFloat64ListProvided(val []float64, v *Float64ListValidation) ([]float64, error) {
	if !v.AllowExplicitNull && val == nil {
		return nil, ErrorCannotBeNull(v.Required)
	}
	return validateFloat64List(val, v)
}

func validateFloat64List(val []float64, v *Float64ListValidation) ([]float64, error) {
	if !v.AllowEmpty {
		if val != nil && len(val) == 0 {
			return nil, ErrorCannotBeEmpty()
		}
	}

	if v.MinLength != 0 {
		if len(val) < v.MinLength {
			return nil, ErrorTooFewElements(v.MinLength)
		}
	}

	if v.MaxLength != 0 {
		if len(val) > v.MaxLength {
			return nil, ErrorTooManyElements(v.MaxLength)
		}
	}

	for _, invalidLength := range v.InvalidLengths {
		if len(val) == invalidLength {
			return nil, ErrorWrongNumberOfElements(v.InvalidLengths)
		}
	}

	if v.Validator != nil {
		return v.Validator(val)
	}
	return val, nil
}
