package docinitrunner

import (
	"context"
	"encoding/json"
	"log/slog"

	"queryorchestration/internal/document"
	documentinit "queryorchestration/internal/document/init"

	"github.com/go-playground/validator/v10"

	"github.com/aws/aws-sdk-go-v2/service/sqs/types"
)

const Name = "docInitRunner"

type Services struct {
	Document *documentinit.Service
}

type Runner struct {
	validator *validator.Validate
	svc       *Services
}

func New(validator *validator.Validate, svc *Services) Runner {
	return Runner{
		validator: validator,
		svc:       svc,
	}
}

type S3Bucket struct {
	Name string `json:"name"`
	Arn  string `json:"arn"`
}

type S3Object struct {
	Key       string `json:"key"`
	Size      int64  `json:"size"`
	ETag      string `json:"eTag"`
	VersionId string `json:"versionId"`
}

type S3EventRecordDetails struct {
	Bucket S3Bucket `json:"bucket"`
	Object S3Object `json:"object"`
}

type S3EventRecord struct {
	EventVersion string               `json:"eventVersion"`
	EventSource  string               `json:"eventSource"`
	AwsRegion    string               `json:"awsRegion"`
	EventTime    string               `json:"eventTime"`
	EventName    EventS3              `json:"eventName"`
	S3           S3EventRecordDetails `json:"s3"`
}
type S3EventNotification struct {
	Records []S3EventRecord `json:"Records"`
}

type EventS3 string

const (
	EventS3ObjectCreatedPut = "ObjectCreated:Put"
)

func (s Runner) Process(ctx context.Context, req *types.Message) bool {
	var body S3EventNotification
	err := json.Unmarshal([]byte(*req.Body), &body)
	if err != nil {
		slog.Error("parsing body", "messageId", *req.MessageId, "body", *req.Body)
		return true
	}

	err = s.validator.Struct(body)
	if err != nil {
		slog.Error("invalid body", "messageId", *req.MessageId, "error", err)
		return true
	}

	for _, record := range body.Records {
		err := s.processRecord(ctx, record)
		if err != nil {
			slog.Error("unable to process", "error", err)
			return false
		}
	}

	return true
}

func (s Runner) processRecord(ctx context.Context, record S3EventRecord) error {
	if !s.isSupportedEvent(record.EventName) {
		slog.Warn("unsupported event", "name", record.EventName)
		return nil
	}

	clientID, err := s.svc.Document.GetClientIDFromKey(record.S3.Object.Key)
	if err != nil {
		slog.Error("unable to find client id", "key", record.S3.Object.Key, "error", err)
		return nil
	}

	_, err = s.svc.Document.Create(ctx, &documentinit.Create{
		ClientID: clientID,
		Location: document.Location{
			Bucket: record.S3.Bucket.Name,
			Key:    record.S3.Object.Key,
		},
		Hash: record.S3.Object.ETag,
	})
	if err != nil {
		return err
	}

	return nil
}

func (s Runner) isSupportedEvent(name EventS3) bool {
	return name == EventS3ObjectCreatedPut
}