package exerr

import (
	"encoding/json"
	"errors"
	"fmt"
	"go.mongodb.org/mongo-driver/bson"
	"go.mongodb.org/mongo-driver/bson/bsoncodec"
	"go.mongodb.org/mongo-driver/bson/bsonrw"
	"go.mongodb.org/mongo-driver/bson/bsontype"
	"gogs.mikescher.com/BlackForestBytes/goext/dataext"
	"gogs.mikescher.com/BlackForestBytes/goext/langext"
	"reflect"
)

type ErrorType struct {
	Key               string
	DefaultStatusCode *int
}

//goland:noinspection GoUnusedGlobalVariable
var (
	TypeInternal       = NewType("INTERNAL_ERROR", langext.Ptr(500))
	TypePanic          = NewType("PANIC", langext.Ptr(500))
	TypeNotImplemented = NewType("NOT_IMPLEMENTED", langext.Ptr(500))

	TypeMongoQuery        = NewType("MONGO_QUERY", langext.Ptr(500))
	TypeCursorTokenDecode = NewType("CURSOR_TOKEN_DECODE", langext.Ptr(500))
	TypeMongoFilter       = NewType("MONGO_FILTER", langext.Ptr(500))
	TypeMongoReflection   = NewType("MONGO_REFLECTION", langext.Ptr(500))
	TypeMongoInvalidOpt   = NewType("MONGO_INVALIDOPT", langext.Ptr(500))

	TypeSQLQuery  = NewType("SQL_QUERY", langext.Ptr(500))
	TypeSQLBuild  = NewType("SQL_BUILD", langext.Ptr(500))
	TypeSQLDecode = NewType("SQL_DECODE", langext.Ptr(500))

	TypeWrap = NewType("Wrap", nil)

	TypeBindFailURI      = NewType("BINDFAIL_URI", langext.Ptr(400))
	TypeBindFailQuery    = NewType("BINDFAIL_QUERY", langext.Ptr(400))
	TypeBindFailJSON     = NewType("BINDFAIL_JSON", langext.Ptr(400))
	TypeBindFailFormData = NewType("BINDFAIL_FORMDATA", langext.Ptr(400))
	TypeBindFailHeader   = NewType("BINDFAIL_HEADER", langext.Ptr(400))

	TypeMarshalEntityID = NewType("MARSHAL_ENTITY_ID", langext.Ptr(400))
	TypeInvalidCSID     = NewType("INVALID_CSID", langext.Ptr(400))

	TypeGoogleStatuscode = NewType("GOOGLE_STATUSCODE", langext.Ptr(400))
	TypeGoogleResponse   = NewType("GOOGLE_RESPONSE", langext.Ptr(400))

	TypeUnauthorized = NewType("UNAUTHORIZED", langext.Ptr(401))
	TypeAuthFailed   = NewType("AUTH_FAILED", langext.Ptr(401))

	TypeInvalidImage    = NewType("IMAGEEXT_INVALID_IMAGE", langext.Ptr(400))
	TypeInvalidMimeType = NewType("IMAGEEXT_INVALID_MIMETYPE", langext.Ptr(400))

	// other values come from the downstream application that uses goext
)

func (e *ErrorType) UnmarshalJSON(bytes []byte) error {
	var k string
	err := json.Unmarshal(bytes, &k)
	if err != nil {
		return err
	}

	if d, ok := registeredTypes.Get(k); ok {
		*e = d
		return nil
	} else {
		*e = ErrorType{k, nil}
		return nil
	}
}

func (e ErrorType) MarshalJSON() ([]byte, error) {
	return json.Marshal(e.Key)
}

func (e *ErrorType) UnmarshalBSONValue(bt bsontype.Type, data []byte) error {
	if bt == bson.TypeNull {
		// we can't set nil in UnmarshalBSONValue (so we use default(struct))
		// Use mongoext.CreateGoExtBsonRegistry if you need to unmarsh pointer values
		// https://stackoverflow.com/questions/75167597
		// https://jira.mongodb.org/browse/GODRIVER-2252
		*e = ErrorType{}
		return nil
	}
	if bt != bson.TypeString {
		return errors.New(fmt.Sprintf("cannot unmarshal %v into String", bt))
	}
	var tt string
	err := bson.RawValue{Type: bt, Value: data}.Unmarshal(&tt)
	if err != nil {
		return err
	}

	if d, ok := registeredTypes.Get(tt); ok {
		*e = d
		return nil
	} else {
		*e = ErrorType{tt, nil}
		return nil
	}
}

func (e ErrorType) MarshalBSONValue() (bsontype.Type, []byte, error) {
	return bson.MarshalValue(e.Key)
}

func (e ErrorType) DecodeValue(dc bsoncodec.DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
	if val.Kind() == reflect.Ptr && val.IsNil() {
		if !val.CanSet() {
			return errors.New("ValueUnmarshalerDecodeValue")
		}
		val.Set(reflect.New(val.Type().Elem()))
	}

	tp, src, err := bsonrw.Copier{}.CopyValueToBytes(vr)
	if err != nil {
		return err
	}

	if val.Kind() == reflect.Ptr && len(src) == 0 {
		val.Set(reflect.Zero(val.Type()))
		return nil
	}

	err = e.UnmarshalBSONValue(tp, src)
	if err != nil {
		return err
	}

	if val.Kind() == reflect.Ptr {
		val.Set(reflect.ValueOf(&e))
	} else {
		val.Set(reflect.ValueOf(e))
	}

	return nil
}

var registeredTypes = dataext.SyncMap[string, ErrorType]{}

func NewType(key string, defStatusCode *int) ErrorType {
	et := ErrorType{key, defStatusCode}

	registeredTypes.Set(key, et)

	return et
}

func ListRegisteredTypes() []ErrorType {
	return registeredTypes.GetAllValues()
}