package loaders

import (
	"context"
	"git.aiterp.net/stufflog/server/database/repositories"
	"git.aiterp.net/stufflog/server/models"
	"time"
)

// go run github.com/vektah/dataloaden LogsByIssueLoader string []\*git.aiterp.net/stufflog/server/models.Log

var logsByIssueLoaderCtxKey = "ctx.stufflog.IssuesByLogLoader"

func LogsByIssueLoaderFromContext(ctx context.Context) *LogsByIssueLoader {
	return ctx.Value(logsByIssueLoaderCtxKey).(*LogsByIssueLoader)
}

func NewLogsByIssueLoader(ctx context.Context, logsRepo repositories.LogRepository) *LogsByIssueLoader {
	return &LogsByIssueLoader{
		fetch: func(keys []string) ([][]*models.Log, []error) {
			results := make([][]*models.Log, len(keys))
			errors := make([]error, len(keys))

			logs, err := logsRepo.List(ctx, models.LogFilter{IssueIDs: keys})
			if err != nil {
				for i := range errors {
					errors[i] = err
				}

				return results, errors
			}

			for i, key := range keys {
				for _, log := range logs {
					if log.MatchesIssue(key) {
						results[i] = append(results[i], log)
					}
				}
			}

			return results, nil
		},
		wait:     time.Millisecond / 2,
		maxBatch: 16,
	}
}