// Copyright 2022 Princess B33f Heavy Industries / Dave Shanley
// SPDX-License-Identifier: MIT

package model

import (
	v3 "github.com/pb33f/libopenapi/datamodel/low/v3"
)

// EncodingChanges represent all the changes made to an Encoding object
type EncodingChanges struct {
	*PropertyChanges
	HeaderChanges map[string]*HeaderChanges `json:"headers,omitempty" yaml:"headers,omitempty"`
}

// GetAllChanges returns a slice of all changes made between Encoding objects
func (e *EncodingChanges) GetAllChanges() []*Change {
	var changes []*Change
	changes = append(changes, e.Changes...)
	for k := range e.HeaderChanges {
		changes = append(changes, e.HeaderChanges[k].GetAllChanges()...)
	}
	return changes
}

// TotalChanges returns the total number of changes made between two Encoding objects
func (e *EncodingChanges) TotalChanges() int {
	c := e.PropertyChanges.TotalChanges()
	if e.HeaderChanges != nil {
		for i := range e.HeaderChanges {
			c += e.HeaderChanges[i].TotalChanges()
		}
	}
	return c
}

// TotalBreakingChanges returns the number of changes made between two Encoding objects that were breaking.
func (e *EncodingChanges) TotalBreakingChanges() int {
	c := e.PropertyChanges.TotalBreakingChanges()
	if e.HeaderChanges != nil {
		for i := range e.HeaderChanges {
			c += e.HeaderChanges[i].TotalBreakingChanges()
		}
	}
	return c
}

// CompareEncoding returns a pointer to *EncodingChanges that contain all changes made between a left and right
// set of Encoding objects.
func CompareEncoding(l, r *v3.Encoding) *EncodingChanges {

	var changes []*Change
	var props []*PropertyCheck

	// ContentType
	props = append(props, &PropertyCheck{
		LeftNode:  l.ContentType.ValueNode,
		RightNode: r.ContentType.ValueNode,
		Label:     v3.ContentTypeLabel,
		Changes:   &changes,
		Breaking:  true,
		Original:  l,
		New:       r,
	})

	// Explode
	props = append(props, &PropertyCheck{
		LeftNode:  l.Explode.ValueNode,
		RightNode: r.Explode.ValueNode,
		Label:     v3.ExplodeLabel,
		Changes:   &changes,
		Breaking:  true,
		Original:  l,
		New:       r,
	})

	// AllowReserved
	props = append(props, &PropertyCheck{
		LeftNode:  l.AllowReserved.ValueNode,
		RightNode: r.AllowReserved.ValueNode,
		Label:     v3.AllowReservedLabel,
		Changes:   &changes,
		Breaking:  false,
		Original:  l,
		New:       r,
	})

	// check everything.
	CheckProperties(props)
	ec := new(EncodingChanges)

	// headers
	ec.HeaderChanges = CheckMapForChanges(l.Headers.Value, r.Headers.Value, &changes, v3.HeadersLabel, CompareHeadersV3)
	ec.PropertyChanges = NewPropertyChanges(changes)
	if ec.TotalChanges() <= 0 {
		return nil
	}
	return ec
}