package docinitrunner

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"log/slog"
	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 S3EventNotification struct {
	Records []struct {
		EventVersion string `json:"eventVersion"`
		EventSource  string `json:"eventSource"`
		AwsRegion    string `json:"awsRegion"`
		EventTime    string `json:"eventTime"`
		EventName    string `json:"eventName"`
		S3           struct {
			Bucket struct {
				Name string `json:"name"`
				Arn  string `json:"arn"`
			} `json:"bucket"`
			Object struct {
				Key       string `json:"key"`
				Size      int64  `json:"size"`
				ETag      string `json:"eTag"`
				VersionId string `json:"versionId"`
			} `json:"object"`
		} `json:"s3"`
	} `json:"Records"`
}

func (s Runner) Process(ctx context.Context, req *types.Message) error {
	var body S3EventNotification
	err := json.Unmarshal([]byte(*req.Body), &body)
	if err != nil {
		return err
	}

	err = s.validator.Struct(body)
	if err != nil {
		return err
	}

	hasErr := false

	for _, record := range body.Records {
		err := func() error {
			if record.EventName != "ObjectCreated:Put" {
				return fmt.Errorf("invalid event name: %s", record.EventName)
			}

			jobID, err := s.svc.Document.GetJobIDFromKey(record.S3.Object.Key)
			if err != nil {
				return err
			}

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

			return nil
		}()
		if err != nil {
			hasErr = true
			slog.Error("Error processing record", "err", err)
		}
	}

	if hasErr {
		return errors.New("error processing records")
	}

	return nil
}