/*
Copyright 2018 The Kubernetes Authors.

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 merge_test

import (
	"testing"

	"sigs.k8s.io/structured-merge-diff/v4/fieldpath"
	. "sigs.k8s.io/structured-merge-diff/v4/internal/fixture"
	"sigs.k8s.io/structured-merge-diff/v4/merge"
	"sigs.k8s.io/structured-merge-diff/v4/typed"
)

var structParser = func() *typed.Parser {
	oldParser, err := typed.NewParser(`types:
- name: v1
  map:
    fields:
      - name: struct
        type:
          namedType: struct
- name: struct
  map:
    fields:
    - name: numeric
      type:
        scalar: numeric
    - name: string
      type:
        scalar: string`)
	if err != nil {
		panic(err)
	}
	return oldParser
}()

var structWithAtomicParser = func() *typed.Parser {
	newParser, err := typed.NewParser(`types:
- name: v1
  map:
    fields:
      - name: struct
        type:
          namedType: struct
- name: struct
  map:
    fields:
    - name: numeric
      type:
        scalar: numeric
    - name: string
      type:
        scalar: string
    elementRelationship: atomic`)
	if err != nil {
		panic(err)
	}
	return newParser
}()

func TestGranularToAtomicSchemaChanges(t *testing.T) {
	tests := map[string]TestCase{
		"to-atomic": {
			Ops: []Operation{
				Apply{
					Manager: "one",
					Object: `
						struct:
						  numeric: 1
					`,
					APIVersion: "v1",
				},
				ChangeParser{Parser: structWithAtomicParser},
				Apply{
					Manager: "two",
					Object: `
						struct:
						  string: "string"
					`,
					APIVersion: "v1",
					Conflicts: merge.Conflicts{
						merge.Conflict{Manager: "one", Path: _P("struct")},
					},
				},
				ForceApply{
					Manager: "two",
					Object: `
						struct:
						  string: "string"
					`,
					APIVersion: "v1",
				},
			},
			Object: `
				struct:
				  string: "string"
			`,
			APIVersion: "v1",
			Managed: fieldpath.ManagedFields{
				"two": fieldpath.NewVersionedSet(_NS(
					_P("struct"),
				), "v1", true),
			},
		},
		"to-atomic-owner-with-no-child-fields": {
			Ops: []Operation{
				Apply{
					Manager: "one",
					Object: `
						struct:
						  numeric: 1
					`,
					APIVersion: "v1",
				},
				ForceApply{ // take the only child field from manager "one"
					Manager: "two",
					Object: `
						struct:
						  numeric: 2
					`,
					APIVersion: "v1",
				},
				ChangeParser{Parser: structWithAtomicParser},
				Apply{
					Manager: "three",
					Object: `
						struct:
						  string: "string"
					`,
					APIVersion: "v1",
					Conflicts: merge.Conflicts{
						// We expect no conflict with "one" because we do not allow a manager
						// to own a map without owning any of the children.
						merge.Conflict{Manager: "two", Path: _P("struct")},
					},
				},
				ForceApply{
					Manager: "two",
					Object: `
						struct:
						  string: "string"
					`,
					APIVersion: "v1",
				},
			},
			Object: `
				struct:
				  string: "string"
			`,
			APIVersion: "v1",
			Managed: fieldpath.ManagedFields{
				"two": fieldpath.NewVersionedSet(_NS(
					_P("struct"),
				), "v1", true),
			},
		},
	}

	for name, test := range tests {
		t.Run(name, func(t *testing.T) {
			if err := test.Test(structParser); err != nil {
				t.Fatal(err)
			}
		})
	}
}

func TestAtomicToGranularSchemaChanges(t *testing.T) {
	tests := map[string]TestCase{
		"to-granular": {
			Ops: []Operation{
				Apply{
					Manager: "one",
					Object: `
						struct:
						  numeric: 1
						  string: "a"
					`,
					APIVersion: "v1",
				},
				Apply{
					Manager: "two",
					Object: `
						struct:
						  string: "b"
					`,
					APIVersion: "v1",
					Conflicts: merge.Conflicts{
						merge.Conflict{Manager: "one", Path: _P("struct")},
					},
				},
				ChangeParser{Parser: structParser},
				Apply{
					Manager: "two",
					Object: `
						struct:
						  string: "b"
					`,
					APIVersion: "v1",
					Conflicts: merge.Conflicts{
						merge.Conflict{Manager: "one", Path: _P("struct", "string")},
					},
				},
				ForceApply{
					Manager: "two",
					Object: `
						struct:
						  string: "b"
					`,
					APIVersion: "v1",
				},
			},
			Object: `
				struct:
				  numeric: 1
				  string: "b"
			`,
			APIVersion: "v1",
			Managed: fieldpath.ManagedFields{
				"one": fieldpath.NewVersionedSet(_NS(
					_P("struct"),
					_P("struct", "numeric"),
				), "v1", true),
				"two": fieldpath.NewVersionedSet(_NS(
					_P("struct", "string"),
				), "v1", true),
			},
		},
	}

	for name, test := range tests {
		t.Run(name, func(t *testing.T) {
			if err := test.Test(structWithAtomicParser); err != nil {
				t.Fatal(err)
			}
		})
	}
}