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

package model

import (
	"testing"

	"github.com/pb33f/libopenapi/datamodel/low"
	"github.com/pb33f/libopenapi/datamodel/low/base"
	"github.com/stretchr/testify/assert"
	"go.yaml.in/yaml/v4"
)

func TestCompareDiscriminator_PropertyNameChanged(t *testing.T) {
	// Clear hash cache to ensure deterministic results in concurrent test environments
	low.ClearHashCache()
	left := `propertyName: chicken`

	right := `propertyName: nuggets`

	var lNode, rNode yaml.Node
	_ = yaml.Unmarshal([]byte(left), &lNode)
	_ = yaml.Unmarshal([]byte(right), &rNode)

	// create low level objects
	var lDoc base.Discriminator
	var rDoc base.Discriminator
	_ = low.BuildModel(lNode.Content[0], &lDoc)
	_ = low.BuildModel(rNode.Content[0], &rDoc)

	// compare.
	extChanges := CompareDiscriminator(&lDoc, &rDoc)
	assert.Equal(t, 1, extChanges.TotalChanges())
	assert.Len(t, extChanges.GetAllChanges(), 1)
	assert.Equal(t, Modified, extChanges.Changes[0].ChangeType)
}

func TestCompareDiscriminator_PropertyNameRemoved(t *testing.T) {
	// Clear hash cache to ensure deterministic results in concurrent test environments
	low.ClearHashCache()
	left := `mapping:
  cake: burger
propertyName: chicken`

	right := `mapping:
  cake: burger`

	var lNode, rNode yaml.Node
	_ = yaml.Unmarshal([]byte(left), &lNode)
	_ = yaml.Unmarshal([]byte(right), &rNode)

	// create low level objects
	var lDoc base.Discriminator
	var rDoc base.Discriminator
	_ = low.BuildModel(lNode.Content[0], &lDoc)
	_ = low.BuildModel(rNode.Content[0], &rDoc)

	// compare.
	extChanges := CompareDiscriminator(&lDoc, &rDoc)
	assert.Equal(t, 1, extChanges.TotalChanges())
	assert.Len(t, extChanges.GetAllChanges(), 1)
	assert.Equal(t, PropertyRemoved, extChanges.Changes[0].ChangeType)
}

func TestCompareDiscriminator_PropertyNameAdded(t *testing.T) {
	// Clear hash cache to ensure deterministic results in concurrent test environments
	low.ClearHashCache()
	left := `mapping:
  cake: burger
propertyName: chicken`

	right := `mapping:
  cake: burger`

	var lNode, rNode yaml.Node
	_ = yaml.Unmarshal([]byte(left), &lNode)
	_ = yaml.Unmarshal([]byte(right), &rNode)

	// create low level objects
	var lDoc base.Discriminator
	var rDoc base.Discriminator
	_ = low.BuildModel(lNode.Content[0], &lDoc)
	_ = low.BuildModel(rNode.Content[0], &rDoc)

	// compare.
	extChanges := CompareDiscriminator(&rDoc, &lDoc)
	assert.Equal(t, 1, extChanges.TotalChanges())
	assert.Len(t, extChanges.GetAllChanges(), 1)
	assert.Equal(t, PropertyAdded, extChanges.Changes[0].ChangeType)
}

func TestCompareDiscriminator_MappingAdded(t *testing.T) {
	// Clear hash cache to ensure deterministic results in concurrent test environments
	low.ClearHashCache()
	left := `propertyName: chicken`

	right := `propertyName: chicken
mapping:
  chuffing: puffing
  hacking: coding`

	var lNode, rNode yaml.Node
	_ = yaml.Unmarshal([]byte(left), &lNode)
	_ = yaml.Unmarshal([]byte(right), &rNode)

	// create low level objects
	var lDoc base.Discriminator
	var rDoc base.Discriminator
	_ = low.BuildModel(lNode.Content[0], &lDoc)
	_ = low.BuildModel(rNode.Content[0], &rDoc)

	// compare.
	extChanges := CompareDiscriminator(&lDoc, &rDoc)
	assert.Equal(t, 2, extChanges.TotalChanges())
	assert.Len(t, extChanges.GetAllChanges(), 2)

	for _, k := range extChanges.MappingChanges {
		assert.Equal(t, ObjectAdded, k.ChangeType)
		if k.Property == "chuffing" {
			assert.Equal(t, "puffing", k.New)
		}
		if k.Property == "hacking" {
			assert.Equal(t, "coding", k.New)
		}
	}
}

func TestCompareDiscriminator_MappingRemoved(t *testing.T) {
	// Clear hash cache to ensure deterministic results in concurrent test environments
	low.ClearHashCache()
	left := `propertyName: chicken
mapping:
  chuffing: puffing
  hacking: coding`

	right := `propertyName: chicken
mapping:
  hacking: coding`

	var lNode, rNode yaml.Node
	_ = yaml.Unmarshal([]byte(left), &lNode)
	_ = yaml.Unmarshal([]byte(right), &rNode)

	// create low level objects
	var lDoc base.Discriminator
	var rDoc base.Discriminator
	_ = low.BuildModel(lNode.Content[0], &lDoc)
	_ = low.BuildModel(rNode.Content[0], &rDoc)

	// compare.
	extChanges := CompareDiscriminator(&lDoc, &rDoc)
	assert.Equal(t, 1, extChanges.TotalChanges())
	assert.Equal(t, ObjectRemoved, extChanges.MappingChanges[0].ChangeType)
	assert.Equal(t, "chuffing", extChanges.MappingChanges[0].Property)
	assert.Equal(t, "puffing", extChanges.MappingChanges[0].Original)
}

func TestCompareDiscriminator_SingleMappingAdded(t *testing.T) {
	// Clear hash cache to ensure deterministic results in concurrent test environments
	low.ClearHashCache()
	left := `propertyName: chicken
mapping:
  chuffing: puffing`

	right := `propertyName: chicken
mapping:
  chuffing: puffing
  hacking: coding`

	var lNode, rNode yaml.Node
	_ = yaml.Unmarshal([]byte(left), &lNode)
	_ = yaml.Unmarshal([]byte(right), &rNode)

	// create low level objects
	var lDoc base.Discriminator
	var rDoc base.Discriminator
	_ = low.BuildModel(lNode.Content[0], &lDoc)
	_ = low.BuildModel(rNode.Content[0], &rDoc)

	// compare.
	extChanges := CompareDiscriminator(&lDoc, &rDoc)
	assert.Equal(t, 1, extChanges.TotalChanges())
	assert.Equal(t, ObjectAdded, extChanges.MappingChanges[0].ChangeType)
	assert.Equal(t, "hacking", extChanges.MappingChanges[0].Property)
	assert.Equal(t, "coding", extChanges.MappingChanges[0].New)
}

func TestCompareDiscriminator_MultiMappingAdded(t *testing.T) {
	// Clear hash cache to ensure deterministic results in concurrent test environments
	low.ClearHashCache()
	left := `propertyName: chicken
mapping:
  chuffing: puffing`

	right := `propertyName: chicken
mapping:
  chuffing: puffing
  hacking: coding
  singing: dancing`

	var lNode, rNode yaml.Node
	_ = yaml.Unmarshal([]byte(left), &lNode)
	_ = yaml.Unmarshal([]byte(right), &rNode)

	// create low level objects
	var lDoc base.Discriminator
	var rDoc base.Discriminator
	_ = low.BuildModel(lNode.Content[0], &lDoc)
	_ = low.BuildModel(rNode.Content[0], &rDoc)

	// compare.
	extChanges := CompareDiscriminator(&lDoc, &rDoc)
	assert.Equal(t, 2, extChanges.TotalChanges())
	assert.Equal(t, ObjectAdded, extChanges.MappingChanges[0].ChangeType)

	for _, k := range extChanges.MappingChanges {
		assert.Equal(t, ObjectAdded, k.ChangeType)
		if k.Property == "hacking" {
			assert.Equal(t, "coding", k.New)
		}
		if k.Property == "singing" {
			assert.Equal(t, "dancing", k.New)
		}
	}
}

func TestCompareDiscriminator_SingleMappingModified(t *testing.T) {
	// Clear hash cache to ensure deterministic results in concurrent test environments
	low.ClearHashCache()
	left := `propertyName: chicken
mapping:
  chuffing: puffing`

	right := `propertyName: chicken
mapping:
  chuffing: herbs`

	var lNode, rNode yaml.Node
	_ = yaml.Unmarshal([]byte(left), &lNode)
	_ = yaml.Unmarshal([]byte(right), &rNode)

	// create low level objects
	var lDoc base.Discriminator
	var rDoc base.Discriminator
	_ = low.BuildModel(lNode.Content[0], &lDoc)
	_ = low.BuildModel(rNode.Content[0], &rDoc)

	// compare.
	extChanges := CompareDiscriminator(&lDoc, &rDoc)
	assert.Equal(t, 1, extChanges.TotalChanges())
	assert.Equal(t, Modified, extChanges.MappingChanges[0].ChangeType)
	assert.Equal(t, "chuffing", extChanges.MappingChanges[0].Property)
	assert.Equal(t, "herbs", extChanges.MappingChanges[0].New)
	assert.Equal(t, "puffing", extChanges.MappingChanges[0].Original)

	// should be a single breaking change
	assert.Equal(t, 1, extChanges.TotalBreakingChanges())
}

func TestCompareDiscriminator_Identical(t *testing.T) {
	// Clear hash cache to ensure deterministic results in concurrent test environments
	low.ClearHashCache()
	left := `propertyName: chicken`

	right := `propertyName: chicken`

	var lNode, rNode yaml.Node
	_ = yaml.Unmarshal([]byte(left), &lNode)
	_ = yaml.Unmarshal([]byte(right), &rNode)

	// create low level objects
	var lDoc base.Discriminator
	var rDoc base.Discriminator
	_ = low.BuildModel(lNode.Content[0], &lDoc)
	_ = low.BuildModel(rNode.Content[0], &rDoc)

	// compare.
	extChanges := CompareDiscriminator(&lDoc, &rDoc)
	assert.Nil(t, extChanges)
}

func TestCompareDiscriminator_DefaultMappingAdded(t *testing.T) {
	// Clear hash cache to ensure deterministic results in concurrent test environments
	low.ClearHashCache()
	left := `propertyName: petType
mapping:
  dog: '#/components/schemas/Dog'`

	right := `propertyName: petType
mapping:
  dog: '#/components/schemas/Dog'
defaultMapping: '#/components/schemas/UnknownPet'`

	var lNode, rNode yaml.Node
	_ = yaml.Unmarshal([]byte(left), &lNode)
	_ = yaml.Unmarshal([]byte(right), &rNode)

	// create low level objects
	var lDoc base.Discriminator
	var rDoc base.Discriminator
	_ = low.BuildModel(lNode.Content[0], &lDoc)
	_ = low.BuildModel(rNode.Content[0], &rDoc)

	// compare.
	extChanges := CompareDiscriminator(&lDoc, &rDoc)
	assert.Equal(t, 1, extChanges.TotalChanges())
	assert.Len(t, extChanges.GetAllChanges(), 1)
	assert.Equal(t, PropertyAdded, extChanges.Changes[0].ChangeType)
	assert.Equal(t, "defaultMapping", extChanges.Changes[0].Property)
	assert.Equal(t, "#/components/schemas/UnknownPet", extChanges.Changes[0].New)

	// should be a breaking change
	assert.Equal(t, 1, extChanges.TotalBreakingChanges())
}

func TestCompareDiscriminator_DefaultMappingModified(t *testing.T) {
	// Clear hash cache to ensure deterministic results in concurrent test environments
	low.ClearHashCache()
	left := `propertyName: petType
mapping:
  dog: '#/components/schemas/Dog'
defaultMapping: '#/components/schemas/UnknownPet'`

	right := `propertyName: petType
mapping:
  dog: '#/components/schemas/Dog'
defaultMapping: '#/components/schemas/GenericAnimal'`

	var lNode, rNode yaml.Node
	_ = yaml.Unmarshal([]byte(left), &lNode)
	_ = yaml.Unmarshal([]byte(right), &rNode)

	// create low level objects
	var lDoc base.Discriminator
	var rDoc base.Discriminator
	_ = low.BuildModel(lNode.Content[0], &lDoc)
	_ = low.BuildModel(rNode.Content[0], &rDoc)

	// compare.
	extChanges := CompareDiscriminator(&lDoc, &rDoc)
	assert.Equal(t, 1, extChanges.TotalChanges())
	assert.Len(t, extChanges.GetAllChanges(), 1)
	assert.Equal(t, Modified, extChanges.Changes[0].ChangeType)
	assert.Equal(t, "defaultMapping", extChanges.Changes[0].Property)
	assert.Equal(t, "#/components/schemas/UnknownPet", extChanges.Changes[0].Original)
	assert.Equal(t, "#/components/schemas/GenericAnimal", extChanges.Changes[0].New)

	// should be a breaking change
	assert.Equal(t, 1, extChanges.TotalBreakingChanges())
}

func TestCompareDiscriminator_DefaultMappingRemoved(t *testing.T) {
	// Clear hash cache to ensure deterministic results in concurrent test environments
	low.ClearHashCache()
	left := `propertyName: petType
mapping:
  dog: '#/components/schemas/Dog'
defaultMapping: '#/components/schemas/UnknownPet'`

	right := `propertyName: petType
mapping:
  dog: '#/components/schemas/Dog'`

	var lNode, rNode yaml.Node
	_ = yaml.Unmarshal([]byte(left), &lNode)
	_ = yaml.Unmarshal([]byte(right), &rNode)

	// create low level objects
	var lDoc base.Discriminator
	var rDoc base.Discriminator
	_ = low.BuildModel(lNode.Content[0], &lDoc)
	_ = low.BuildModel(rNode.Content[0], &rDoc)

	// compare.
	extChanges := CompareDiscriminator(&lDoc, &rDoc)
	assert.Equal(t, 1, extChanges.TotalChanges())
	assert.Len(t, extChanges.GetAllChanges(), 1)
	assert.Equal(t, PropertyRemoved, extChanges.Changes[0].ChangeType)
	assert.Equal(t, "defaultMapping", extChanges.Changes[0].Property)
	assert.Equal(t, "#/components/schemas/UnknownPet", extChanges.Changes[0].Original)

	// should be a breaking change
	assert.Equal(t, 1, extChanges.TotalBreakingChanges())
}