package processing

import (
	"context"
	"os"
	"testing"
	"time"

	"github.com/google/uuid"
	"github.com/jackc/pgx/v5/pgxpool"
)

func TestCleanupExpiredSyncJobsKeepsLatestHashAndDeletesAged(t *testing.T) {
	dsn := os.Getenv("DATABASE_URL")
	if dsn == "" {
		t.Skip("DATABASE_URL not set")
	}

	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
	defer cancel()

	pg, err := pgxpool.New(ctx, dsn)
	if err != nil {
		t.Fatal(err)
	}
	defer pg.Close()

	companyID := uuid.New()
	_, err = pg.Exec(ctx, `INSERT INTO companies (id, name) VALUES ($1, $2)`,
		companyID, "retention-"+companyID.String()[:8])
	if err != nil {
		t.Fatalf("seed company: %v", err)
	}
	t.Cleanup(func() {
		_, _ = pg.Exec(context.Background(), `DELETE FROM companies WHERE id = $1`, companyID)
	})

	insertFeed := func(name string) uuid.UUID {
		t.Helper()
		var id uuid.UUID
		err := pg.QueryRow(ctx, `
			INSERT INTO input_feeds (company_id, name, url, feed_type, status, sync_interval_minutes, options)
			VALUES ($1, $2, '', 'csv', 'active', 60, '{}'::jsonb)
			RETURNING id`, companyID, name).Scan(&id)
		if err != nil {
			t.Fatal(err)
		}
		return id
	}

	insertSync := func(feedID uuid.UUID, status, age, hash string) uuid.UUID {
		t.Helper()
		var id uuid.UUID
		q := `
			INSERT INTO feed_sync_jobs (
				feed_id, company_id, status, started_at, completed_at,
				updated_at, created_at, content_hash
			) VALUES (
				$1, $2, $3,
				now() - interval '` + age + `',
				now() - interval '` + age + `',
				now() - interval '` + age + `',
				now() - interval '` + age + `',
				NULLIF($4, '')
			) RETURNING id`
		if err := pg.QueryRow(ctx, q, feedID, companyID, status, hash).Scan(&id); err != nil {
			t.Fatal(err)
		}
		return id
	}

	assertGone := func(id uuid.UUID, label string) {
		t.Helper()
		var n int
		if err := pg.QueryRow(ctx, `SELECT COUNT(*) FROM feed_sync_jobs WHERE id = $1`, id).Scan(&n); err != nil {
			t.Fatal(err)
		}
		if n != 0 {
			t.Fatalf("%s still present", label)
		}
	}
	assertPresent := func(id uuid.UUID, label string) {
		t.Helper()
		var n int
		if err := pg.QueryRow(ctx, `SELECT COUNT(*) FROM feed_sync_jobs WHERE id = $1`, id).Scan(&n); err != nil {
			t.Fatal(err)
		}
		if n != 1 {
			t.Fatalf("%s missing", label)
		}
	}

	t.Run("deletesAgedWhenFresherHashExists", func(t *testing.T) {
		feedID := insertFeed("retention-fresh")
		olderHash := insertSync(feedID, "completed", "60 days", "hash-old")
		midHash := insertSync(feedID, "completed", "45 days", "hash-mid")
		oldFailed := insertSync(feedID, "failed", "45 days", "")
		freshCompleted := insertSync(feedID, "completed", "1 day", "hash-fresh")
		oldRunning := insertSync(feedID, "running", "45 days", "")

		res, err := CleanupExpiredSyncJobs(ctx, pg)
		if err != nil {
			t.Fatal(err)
		}
		if res.SyncJobsDeleted < 3 {
			t.Fatalf("sync_jobs_deleted=%d want >= 3", res.SyncJobsDeleted)
		}

		assertGone(olderHash, "older completed hash")
		assertGone(midHash, "mid completed hash")
		assertGone(oldFailed, "old failed")
		assertPresent(freshCompleted, "fresh completed")
		assertPresent(oldRunning, "old running")
	})

	t.Run("keepsNewestAgedHashWhenNoFresher", func(t *testing.T) {
		feedID := insertFeed("retention-stale")
		olderHash := insertSync(feedID, "completed", "60 days", "hash-old")
		keepHash := insertSync(feedID, "completed", "45 days", "hash-keep")
		oldFailed := insertSync(feedID, "failed", "45 days", "")

		res, err := CleanupExpiredSyncJobs(ctx, pg)
		if err != nil {
			t.Fatal(err)
		}
		if res.SyncJobsDeleted < 2 {
			t.Fatalf("sync_jobs_deleted=%d want >= 2", res.SyncJobsDeleted)
		}

		assertGone(olderHash, "older completed hash")
		assertGone(oldFailed, "old failed")
		assertPresent(keepHash, "newest aged completed with hash")

		var hash string
		err = pg.QueryRow(ctx, `
			SELECT content_hash FROM feed_sync_jobs
			WHERE feed_id = $1 AND status = 'completed' AND content_hash IS NOT NULL AND content_hash <> ''
			ORDER BY completed_at DESC NULLS LAST LIMIT 1`, feedID).Scan(&hash)
		if err != nil {
			t.Fatal(err)
		}
		if hash != "hash-keep" {
			t.Fatalf("lastContentHash=%q want hash-keep", hash)
		}
	})
}