package service

import (
	"context"
	"errors"

	"github.com/Tencent/WeKnora/internal/common/redislock"
)

// Long page synthesis needs a renewable, token-owned lease. Redis failure
// stops reduction instead of allowing unlocked writes; releasing a stale
// owner can never delete a successor's lock.
func (s *wikiIngestService) withSlugLock(ctx context.Context, kbID, slug string, fn func(context.Context) error) (bool, error) {
	if s.redisClient == nil {
		return true, fn(ctx)
	}
	acquired := false
	err := redislock.WithRenewableLockWait(ctx, s.redisClient, wikiSlugLockPrefix+kbID+":"+slug,
		wikiSlugLockTTL, wikiSlugLockTTL/3, wikiSlugLockWait, func(lockCtx context.Context) error {
			acquired = true
			if err := redislock.EnsureOwnership(lockCtx); err != nil {
				return err
			}
			return fn(lockCtx)
		})
	if !acquired && ctx.Err() == nil && errors.Is(err, context.DeadlineExceeded) {
		return false, nil
	}
	return acquired, err
}

func verifyWikiSlugOwnership(ctx context.Context) error {
	return redislock.EnsureOwnership(ctx)
}