package logic

import (
	"context"

	modentity "spark-server/internal/module/moderation/entity"
)

// Scan implements message TextFilter. No hit returns (nil, nil).
func (s *Service) Scan(ctx context.Context, text string) (*modentity.ScanResult, error) {
	if !s.Ready() {
		return nil, nil
	}
	_ = ctx
	details, masked, ok := s.repo.MatcherFind(text)
	if len(details) == 0 {
		return nil, nil
	}
	if !ok {
		return &modentity.ScanResult{Action: modentity.ActionReject, Hits: toHits(details)}, nil
	}
	var actions []modentity.Action
	var muteSec int
	hits := make([]modentity.HitMatch, 0, len(details))
	for i := range details {
		d := details[i]
		act := d.Action.Effective()
		actions = append(actions, act)
		if act == modentity.ActionMute {
			if w := s.repo.LookupWord(d.WordID); w != nil && w.MuteSeconds > muteSec {
				muteSec = w.MuteSeconds
			}
		}
		hits = append(hits, modentity.HitMatch{
			WordID: d.WordID, Category: d.Category, Action: d.Action,
			Excerpt: d.Excerpt, ByteFrom: d.From, ByteTo: d.To,
		})
	}
	best := modentity.MaxAction(actions...)
	res := &modentity.ScanResult{Action: best, Hits: hits, MuteSeconds: muteSec}
	if best == modentity.ActionReplace {
		res.ReplacedBody = masked
	}
	return res, nil
}

func toHits(details []MatchDetail) []modentity.HitMatch {
	out := make([]modentity.HitMatch, 0, len(details))
	for i := range details {
		d := details[i]
		out = append(out, modentity.HitMatch{
			WordID: d.WordID, Category: d.Category, Action: d.Action,
			Excerpt: d.Excerpt, ByteFrom: d.From, ByteTo: d.To,
		})
	}
	return out
}