/*
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 fake

import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"time"

	awssm "github.com/aws/aws-sdk-go-v2/service/secretsmanager"
	"github.com/google/go-cmp/cmp"
	"github.com/google/go-cmp/cmp/cmpopts"
	"k8s.io/utils/ptr"
)

// Client implements the aws secretsmanager interface.
type Client struct {
	ExecutionCounter      int
	valFn                 map[string]func(*awssm.GetSecretValueInput) (*awssm.GetSecretValueOutput, error)
	CreateSecretFn        CreateSecretFn
	GetSecretValueFn      GetSecretValueFn
	PutSecretValueFn      PutSecretValueFn
	DescribeSecretFn      DescribeSecretFn
	DeleteSecretFn        DeleteSecretFn
	ListSecretsFn         ListSecretsFn
	BatchGetSecretValueFn BatchGetSecretValueFn
	TagResourceFn         TagResourceFn
	UntagResourceFn       UntagResourceFn
}
type CreateSecretFn func(context.Context, *awssm.CreateSecretInput, ...func(*awssm.Options)) (*awssm.CreateSecretOutput, error)
type GetSecretValueFn func(context.Context, *awssm.GetSecretValueInput, ...func(*awssm.Options)) (*awssm.GetSecretValueOutput, error)
type PutSecretValueFn func(context.Context, *awssm.PutSecretValueInput, ...func(*awssm.Options)) (*awssm.PutSecretValueOutput, error)
type DescribeSecretFn func(context.Context, *awssm.DescribeSecretInput, ...func(*awssm.Options)) (*awssm.DescribeSecretOutput, error)
type DeleteSecretFn func(context.Context, *awssm.DeleteSecretInput, ...func(*awssm.Options)) (*awssm.DeleteSecretOutput, error)
type ListSecretsFn func(context.Context, *awssm.ListSecretsInput, ...func(*awssm.Options)) (*awssm.ListSecretsOutput, error)
type BatchGetSecretValueFn func(context.Context, *awssm.BatchGetSecretValueInput, ...func(*awssm.Options)) (*awssm.BatchGetSecretValueOutput, error)

type TagResourceFn func(context.Context, *awssm.TagResourceInput, ...func(*awssm.Options)) (*awssm.TagResourceOutput, error)
type UntagResourceFn func(context.Context, *awssm.UntagResourceInput, ...func(*awssm.Options)) (*awssm.UntagResourceOutput, error)

func (sm *Client) CreateSecret(ctx context.Context, input *awssm.CreateSecretInput, options ...func(*awssm.Options)) (*awssm.CreateSecretOutput, error) {
	return sm.CreateSecretFn(ctx, input, options...)
}

func NewCreateSecretFn(output *awssm.CreateSecretOutput, err error, expectedSecretBinary ...[]byte) CreateSecretFn {
	return func(ctx context.Context, actualInput *awssm.CreateSecretInput, options ...func(*awssm.Options)) (*awssm.CreateSecretOutput, error) {
		if *actualInput.ClientRequestToken != "00000000-0000-0000-0000-000000000001" {
			return nil, errors.New("expected the version to be 1 at creation")
		}
		if len(expectedSecretBinary) == 1 {
			if bytes.Equal(actualInput.SecretBinary, expectedSecretBinary[0]) {
				return output, err
			}
			return nil, fmt.Errorf("expected secret to be '%s' but was '%s'", string(expectedSecretBinary[0]), string(actualInput.SecretBinary))
		}
		return output, err
	}
}

func (sm *Client) DeleteSecret(ctx context.Context, input *awssm.DeleteSecretInput, opts ...func(*awssm.Options)) (*awssm.DeleteSecretOutput, error) {
	return sm.DeleteSecretFn(ctx, input, opts...)
}

func NewDeleteSecretFn(output *awssm.DeleteSecretOutput, err error) DeleteSecretFn {
	return func(ctx context.Context, input *awssm.DeleteSecretInput, opts ...func(*awssm.Options)) (*awssm.DeleteSecretOutput, error) {
		if input.ForceDeleteWithoutRecovery != nil && *input.ForceDeleteWithoutRecovery {
			output.DeletionDate = ptr.To(time.Now())
		}
		return output, err
	}
}

func NewGetSecretValueFn(output *awssm.GetSecretValueOutput, err error) GetSecretValueFn {
	return func(ctx context.Context, input *awssm.GetSecretValueInput, options ...func(*awssm.Options)) (*awssm.GetSecretValueOutput, error) {
		return output, err
	}
}

func (sm *Client) PutSecretValue(ctx context.Context, input *awssm.PutSecretValueInput, options ...func(*awssm.Options)) (*awssm.PutSecretValueOutput, error) {
	return sm.PutSecretValueFn(ctx, input, options...)
}

type ExpectedPutSecretValueInput struct {
	SecretBinary []byte
	Version      *string
}

func (e ExpectedPutSecretValueInput) assertEquals(actualInput *awssm.PutSecretValueInput) error {
	errSecretBinary := e.assertSecretBinary(actualInput)
	if errSecretBinary != nil {
		return errSecretBinary
	}
	errSecretVersion := e.assertVersion(actualInput)
	if errSecretVersion != nil {
		return errSecretVersion
	}

	return nil
}

func (e ExpectedPutSecretValueInput) assertSecretBinary(actualInput *awssm.PutSecretValueInput) error {
	if e.SecretBinary != nil && !bytes.Equal(actualInput.SecretBinary, e.SecretBinary) {
		return fmt.Errorf("expected secret to be '%s' but was '%s'", string(e.SecretBinary), string(actualInput.SecretBinary))
	}
	return nil
}

func (e ExpectedPutSecretValueInput) assertVersion(actualInput *awssm.PutSecretValueInput) error {
	if e.Version != nil && (*actualInput.ClientRequestToken != *e.Version) {
		return fmt.Errorf("expected version to be '%s', but was '%s'", *e.Version, *actualInput.ClientRequestToken)
	}
	return nil
}

func NewPutSecretValueFn(output *awssm.PutSecretValueOutput, err error, expectedInput ...ExpectedPutSecretValueInput) PutSecretValueFn {
	return func(ctx context.Context, actualInput *awssm.PutSecretValueInput, actualOptions ...func(*awssm.Options)) (*awssm.PutSecretValueOutput, error) {
		if len(expectedInput) == 1 {
			assertErr := expectedInput[0].assertEquals(actualInput)
			if assertErr != nil {
				return nil, assertErr
			}
		}
		return output, err
	}
}

func (sm *Client) DescribeSecret(ctx context.Context, input *awssm.DescribeSecretInput, options ...func(*awssm.Options)) (*awssm.DescribeSecretOutput, error) {
	return sm.DescribeSecretFn(ctx, input, options...)
}

func NewDescribeSecretFn(output *awssm.DescribeSecretOutput, err error) DescribeSecretFn {
	return func(ctx context.Context, input *awssm.DescribeSecretInput, options ...func(*awssm.Options)) (*awssm.DescribeSecretOutput, error) {
		return output, err
	}
}

// NewClient init a new fake client.
func NewClient() *Client {
	return &Client{
		valFn: make(map[string]func(*awssm.GetSecretValueInput) (*awssm.GetSecretValueOutput, error)),
	}
}

func (sm *Client) GetSecretValue(ctx context.Context, in *awssm.GetSecretValueInput, options ...func(*awssm.Options)) (*awssm.GetSecretValueOutput, error) {
	// check if there's a direct fake function for this input
	if sm.GetSecretValueFn != nil {
		return sm.GetSecretValueFn(ctx, in, options...)
	}
	sm.ExecutionCounter++
	if entry, found := sm.valFn[sm.cacheKeyForInput(in)]; found {
		return entry(in)
	}
	return nil, errors.New("test case not found")
}

func (sm *Client) ListSecrets(ctx context.Context, input *awssm.ListSecretsInput, options ...func(*awssm.Options)) (*awssm.ListSecretsOutput, error) {
	return sm.ListSecretsFn(ctx, input, options...)
}

func (sm *Client) BatchGetSecretValue(ctx context.Context, in *awssm.BatchGetSecretValueInput, options ...func(*awssm.Options)) (*awssm.BatchGetSecretValueOutput, error) {
	return sm.BatchGetSecretValueFn(ctx, in, options...)
}

func (sm *Client) cacheKeyForInput(in *awssm.GetSecretValueInput) string {
	var secretID, versionID string
	if in.SecretId != nil {
		secretID = *in.SecretId
	}
	if in.VersionId != nil {
		versionID = *in.VersionId
	}
	return fmt.Sprintf("%s#%s", secretID, versionID)
}

func (sm *Client) WithValue(in *awssm.GetSecretValueInput, val *awssm.GetSecretValueOutput, err error) {
	sm.valFn[sm.cacheKeyForInput(in)] = func(paramIn *awssm.GetSecretValueInput) (*awssm.GetSecretValueOutput, error) {
		if !cmp.Equal(paramIn, in, cmpopts.IgnoreUnexported(awssm.GetSecretValueInput{})) {
			return nil, errors.New("unexpected test argument")
		}
		return val, err
	}
}

func (sm *Client) TagResource(ctx context.Context, params *awssm.TagResourceInput, optFns ...func(*awssm.Options)) (*awssm.TagResourceOutput, error) {
	return sm.TagResourceFn(ctx, params, optFns...)
}

func NewTagResourceFn(output *awssm.TagResourceOutput, err error, aFunc ...func(input *awssm.TagResourceInput)) TagResourceFn {
	return func(ctx context.Context, params *awssm.TagResourceInput, optFns ...func(*awssm.Options)) (*awssm.TagResourceOutput, error) {
		for _, f := range aFunc {
			f(params)
		}
		return output, err
	}
}

func (sm *Client) UntagResource(ctx context.Context, params *awssm.UntagResourceInput, optFuncs ...func(*awssm.Options)) (*awssm.UntagResourceOutput, error) {
	return sm.UntagResourceFn(ctx, params, optFuncs...)
}

func NewUntagResourceFn(output *awssm.UntagResourceOutput, err error, aFunc ...func(input *awssm.UntagResourceInput)) UntagResourceFn {
	return func(ctx context.Context, params *awssm.UntagResourceInput, optFuncs ...func(*awssm.Options)) (*awssm.UntagResourceOutput, error) {
		for _, f := range aFunc {
			f(params)
		}
		return output, err
	}
}