// Copyright 2024 Matthew Rich <matthewrich.conf@gmail.com>. All rights reserved.

package resource

import (
	"context"
_	"encoding/json"
	"fmt"
	"github.com/stretchr/testify/assert"
_	"gopkg.in/yaml.v3"
	"io"
_	"log"
_	"os"
	"decl/internal/transport"
	"decl/internal/ext"
	"decl/internal/codec"
	"decl/internal/data"
	"decl/internal/folio"
	"strings"
	"testing"
	"path/filepath"
)

type TestResourceMapper func(key string) (data.Declaration, bool)

func (rm TestResourceMapper) Get(key string) (data.Declaration, bool) {
	return rm(key)
}

func (rm TestResourceMapper) Has(key string) (ok bool) {
	_, ok = rm(key)
	return
}

func (rm TestResourceMapper) Set(key string, value data.Declaration) {
}

func (rm TestResourceMapper) Delete(key string) {
}

type StringContentReadWriter func() (any, error)

func (s StringContentReadWriter) ContentWriterStream() (*transport.Writer, error) {
	w, e := s()
	return w.(*transport.Writer), e
}

func (s StringContentReadWriter) ContentReaderStream() (*transport.Reader, error) {
	r, e := s()
	return r.(*transport.Reader), e
}

func (s StringContentReadWriter) Apply(string) error { return nil }
func (s StringContentReadWriter) Clone() data.Declaration { return nil }
func (s StringContentReadWriter) Load(docData []byte, f codec.Format) (err error) { return }
func (s StringContentReadWriter) LoadReader(r io.ReadCloser, f codec.Format) (err error) { return }
func (s StringContentReadWriter) LoadString(docData string, f codec.Format) (err error) { return }
func (s StringContentReadWriter) LoadDecl(yamlResourceDeclaration string) error { return nil }
func (s StringContentReadWriter) ResolveId(ctx context.Context) (string) { return "" }
func (s StringContentReadWriter) SetURI(uri string) (error) { return nil }
func (s StringContentReadWriter) SetParsedURI(uri data.URIParser) (error) { return nil }
func (s StringContentReadWriter) URI() (string) { return "" }
func (s StringContentReadWriter) Validate() (error) { return nil }
func (s StringContentReadWriter) ResourceType() data.TypeName { return "" }
func (s StringContentReadWriter) Resource() data.Resource { return nil }


func TestNewPKIKeysResource(t *testing.T) {
	r := NewPKI()
	assert.NotNil(t, r)
}

func TestPKIPrivateKey(t *testing.T) {
	r := NewPKI()
	assert.NotNil(t, r)
	assert.Equal(t, 2048, r.Bits)
	assert.Nil(t, r.GenerateKey())
	assert.NotNil(t, r.privateKey)
	r.PublicKey()
	assert.NotNil(t, r.publicKey)
}

func TestPKIEncodeKeys(t *testing.T) {
	var privateTarget, publicTarget, certTarget strings.Builder
	r := NewPKI()
	assert.NotNil(t, r)
	assert.Equal(t, 2048, r.Bits)
	assert.Nil(t, r.GenerateKey())
	assert.NotNil(t, r.privateKey)
	r.PublicKey()
	assert.NotNil(t, r.publicKey)

	r.Resources = TestResourceMapper(func(key string) (data.Declaration, bool) {
		switch key {
		case "buffer://privatekey":
			return StringContentReadWriter(func() (any, error) {
				w := &transport.Writer{}
				w.SetStream(ext.WriteNopCloser(&privateTarget))
				return w, nil
			}), true
		case "buffer://publickey":
			return StringContentReadWriter(func() (any, error) {
				w := &transport.Writer{}
				w.SetStream(ext.WriteNopCloser(&publicTarget))
				return w, nil
			}), true
		case "buffer://certificate":
			return StringContentReadWriter(func() (any, error) {
				w := &transport.Writer{}
				w.SetStream(ext.WriteNopCloser(&certTarget))
				return w, nil
			}), true
		}
		return nil, false
	})

	r.PrivateKeyRef = folio.ResourceReference("buffer://privatekey")
	r.PublicKeyRef = folio.ResourceReference("buffer://publickey")

	r.Encode()
	assert.Equal(t, "-----BEGIN RSA PRIVATE KEY-----", strings.Split(privateTarget.String(), "\n")[0])
	assert.Equal(t, "-----BEGIN RSA PUBLIC KEY-----", strings.Split(publicTarget.String(), "\n")[0])

	r.CertificateRef = folio.ResourceReference("buffer://certificate")

	e := r.GenerateCertificate()
	assert.Nil(t, e)
	assert.Equal(t, "-----BEGIN CERTIFICATE-----", strings.Split(certTarget.String(), "\n")[0])
}

func TestPKIResource(t *testing.T) {
	privateKeyFile, _ := filepath.Abs(TempDir.FilePath("fooprivatekey.pem"))
	publicKeyFile, _ := filepath.Abs(TempDir.FilePath("foopublickey.pem"))
	certFile, _ := filepath.Abs(TempDir.FilePath("foocert.pem"))
	var resourceYaml, readResourceYaml strings.Builder

	expected := fmt.Sprintf(`
privatekeyref: "file://%s"
publickeyref: "file://%s"
certificateref: "file://%s"
bits: 2048
type: pem
`, privateKeyFile, publicKeyFile, certFile)

	r := NewPKI()
	assert.NotNil(t, r)
	assert.Equal(t, 2048, r.Bits)
	assert.Nil(t, r.GenerateKey())
	assert.NotNil(t, r.privateKey)
	r.PublicKey()
	assert.NotNil(t, r.publicKey)
	r.PrivateKeyRef = folio.ResourceReference(fmt.Sprintf("file://%s", privateKeyFile))
	r.PublicKeyRef = folio.ResourceReference(fmt.Sprintf("file://%s", publicKeyFile))
	r.CertificateRef = folio.ResourceReference(fmt.Sprintf("file://%s", certFile))
	createErr := r.Create(context.Background())
	assert.Nil(t, createErr)
	assert.FileExists(t, privateKeyFile)
	assert.FileExists(t, publicKeyFile)
	assert.FileExists(t, certFile)

	serializeErr := codec.FormatYaml.Serialize(r, &resourceYaml)
	assert.Nil(t, serializeErr)
	assert.YAMLEq(t, expected, resourceYaml.String())

	read := NewPKI()
	assert.NotNil(t, read)
	read.PrivateKeyRef = folio.ResourceReference(fmt.Sprintf("file://%s", privateKeyFile))
	read.PublicKeyRef = folio.ResourceReference(fmt.Sprintf("file://%s", publicKeyFile))
	read.CertificateRef = folio.ResourceReference(fmt.Sprintf("file://%s", certFile))
	
	_, readErr := read.Read(context.Background())
	assert.Nil(t, readErr)

	expectedContent := fmt.Sprintf(`
privatekey: |
  %s
publickey: |
  %s
certificate: |
  %s
privatekeyref: "file://%s"
publickeyref: "file://%s"
certificateref: "file://%s"
bits: 2048
type: pem
`, strings.Replace(read.PrivateKeyPem, "\n", "\n  ", -1), strings.Replace(read.PublicKeyPem, "\n", "\n  ", -1), strings.Replace(read.CertificatePem, "\n", "\n  ", -1), privateKeyFile, publicKeyFile, certFile)

	readSerializeErr := codec.FormatYaml.Serialize(read, &readResourceYaml)
	assert.Nil(t, readSerializeErr)
	assert.YAMLEq(t, expectedContent, readResourceYaml.String())

}