package elastic

import (
	"context"
)

func Open(context.Context, []Position) error {

	// Open a connection with ElasticSearch
	cfg := elasticsearch.Config{
		Addresses: []string{
			c.cfg.Host,
		},
	}

	var err error
	c.es, err = elasticsearch.NewClient(cfg)
	if err != nil {
		return err
	}

	// create a buffer channel
	c.ch = make(chan Data, c.cfg.BatchSize)

	// open bolt db
	c.db, err = bolt.Open(c.cfg.DBPath, 0644, nil)
	if err != nil {
		return err
	}

	for _, index := range c.config.Indexes {
		offset, err := getOffset(c.db, index)
		if err != nil {
			return err
		}
		c.offsets[index] = offset
		NewWorker(c.es, index, offset, c.config.BatchSize)
	}

	return nil
}