package channels

import (
	"context"
	"log"
	"time"

	"git.aiterp.net/rpdata/logbot3/internal/models"
	"git.aiterp.net/rpdata/logbot3/internal/models/changes"
)

// SubscribeLogged returns a channel that gets all the channel changes.
func SubscribeLogged(ctx context.Context) (<-chan models.Channel, error) {
	earliest := time.Now()
	channels, err := ListLogged(ctx)
	if err != nil {
		return nil, err
	}

	output := make(chan models.Channel, len(channels)+8)
	for _, channel := range channels {
		output <- channel
	}

	go func() {
		for {
			time.Sleep(time.Second * 5)

			// Get the changes.
			changes, err := changes.List(ctx, &changes.Filter{EarliestDate: &earliest, Keys: []models.ChangeKey{{Model: "Channel", ID: "*"}}})
			if ctx.Err() != nil {
				return
			} else if err != nil {
				log.Println("Failed to get chnges:", err)
				continue
			}

			// Group changes to the same model.
			for _, change := range changes {
				for _, obj := range change.Objects {
					channel, err := obj.Channel()
					if err != nil {
						continue
					}

					output <- channel
				}
			}
		}
	}()

	return output, nil
}