package builtin

import (
	"context"
	"sort"

	"gitea.maximumdirect.net/eric/seriatim/internal/config"
	"gitea.maximumdirect.net/eric/seriatim/internal/model"
	"gitea.maximumdirect.net/eric/seriatim/internal/report"
)

type placeholderMerger struct{}

func (placeholderMerger) Name() string {
	return "placeholder-merger"
}

func (placeholderMerger) Merge(ctx context.Context, in []model.CanonicalTranscript, cfg config.Config) (model.MergedTranscript, []report.Event, error) {
	if err := ctx.Err(); err != nil {
		return model.MergedTranscript{}, nil, err
	}

	segments := make([]model.Segment, 0)
	for _, transcript := range in {
		segments = append(segments, transcript.Segments...)
	}

	sort.SliceStable(segments, func(i, j int) bool {
		left := segments[i]
		right := segments[j]
		if left.Start != right.Start {
			return left.Start < right.Start
		}
		if left.End != right.End {
			return left.End < right.End
		}
		if left.Source != right.Source {
			return left.Source < right.Source
		}
		if left.SourceSegmentIndex != right.SourceSegmentIndex {
			return left.SourceSegmentIndex < right.SourceSegmentIndex
		}
		return left.Speaker < right.Speaker
	})

	return model.MergedTranscript{
			Segments:      segments,
			OverlapGroups: nil,
		}, []report.Event{
			report.Info("merge", "placeholder-merger", "merged placeholder canonical transcript(s)"),
		}, nil
}