// backend\startup_leftovers.go

package main

import (
	"os"
	"path/filepath"
	"strings"
	"time"

	"github.com/google/uuid"
)

const startupLeftoverMinAge = 60 * time.Second

func startPostworkLeftoverScanOnStartup() {
	go func() {
		// Kurz warten, bis Settings, Queues und UI/SSE bereit sind.
		time.Sleep(8 * time.Second)

		queued, skipped := enqueuePostworkLeftoversFromRecordDir()
		if queued > 0 || skipped > 0 {
			appLogln(
				"🧩 [startup-postwork] leftover scan fertig:",
				"queued=", queued,
				"skipped=", skipped,
			)
		}
	}()
}

func enqueuePostworkLeftoversFromRecordDir() (queued int, skipped int) {
	s := getSettings()

	recordAbs, err := resolvePathRelativeToApp(s.RecordDir)
	if err != nil || strings.TrimSpace(recordAbs) == "" {
		recordAbs = strings.TrimSpace(s.RecordDir)
	}
	recordAbs = strings.TrimSpace(recordAbs)
	if recordAbs == "" {
		appLogln("⚠️ [startup-postwork] recordDir ist leer")
		return 0, 0
	}

	entries, err := os.ReadDir(recordAbs)
	if err != nil {
		appLogln("⚠️ [startup-postwork] recordDir lesen fehlgeschlagen:", err)
		return 0, 0
	}

	now := time.Now()

	skip := func(name string, reason string, extra ...any) {
		skipped++

		args := []any{
			"⏭️ [startup-postwork] skip:",
			name,
			"reason:",
			reason,
		}
		args = append(args, extra...)
		appLogln(args...)
	}

	for _, e := range entries {
		if e == nil || e.IsDir() {
			continue
		}

		name := strings.TrimSpace(e.Name())
		if name == "" {
			continue
		}

		if strings.HasPrefix(name, ".") {
			continue
		}

		if !strings.EqualFold(filepath.Ext(name), ".ts") {
			continue
		}

		tsPath := filepath.Join(recordAbs, name)

		tsInfo, err := os.Stat(tsPath)
		if err != nil {
			skip(name, "ts stat failed", err)
			continue
		}
		if tsInfo == nil || tsInfo.IsDir() {
			skip(name, "ts invalid")
			continue
		}
		if tsInfo.Size() <= 0 {
			skip(name, "ts empty")
			continue
		}

		tsAge := now.Sub(tsInfo.ModTime())
		if tsAge < startupLeftoverMinAge {
			skip(
				name,
				"ts too fresh",
				"age=", tsAge.Round(time.Second),
				"min=", startupLeftoverMinAge,
			)
			continue
		}

		audioPath, ok := findPostworkAudioSidecarForTS(tsPath)
		if !ok {
			skip(name, "matching audio sidecar not found")
			continue
		}

		audioInfo, err := os.Stat(audioPath)
		if err != nil {
			skip(name, "audio stat failed", filepath.Base(audioPath), err)
			continue
		}
		if audioInfo == nil || audioInfo.IsDir() {
			skip(name, "audio invalid", filepath.Base(audioPath))
			continue
		}
		if audioInfo.Size() <= 0 {
			skip(name, "audio empty", filepath.Base(audioPath))
			continue
		}

		audioAge := now.Sub(audioInfo.ModTime())
		if audioAge < startupLeftoverMinAge {
			skip(
				name,
				"audio too fresh",
				filepath.Base(audioPath),
				"age=", audioAge.Round(time.Second),
				"min=", startupLeftoverMinAge,
			)
			continue
		}

		if postworkLeftoverAlreadyTracked(tsPath) {
			skip(name, "already tracked as job")
			continue
		}

		if postworkLeftoverDoneMP4Exists(tsPath) {
			skip(name, "done mp4 already exists")
			continue
		}

		if !postworkLeftoverFilesStable(tsPath, audioPath) {
			skip(name, "files not stable", filepath.Base(audioPath))
			continue
		}

		if enqueuePostworkLeftover(tsPath, tsInfo) {
			queued++
		} else {
			skip(name, "enqueue failed")
		}
	}

	return queued, skipped
}

func postworkLeftoverAlreadyTracked(tsPath string) bool {
	tsPath = filepath.Clean(strings.TrimSpace(tsPath))
	if tsPath == "" {
		return false
	}

	jobsMu.RLock()
	defer jobsMu.RUnlock()

	for _, j := range jobs {
		if j == nil {
			continue
		}

		out := filepath.Clean(strings.TrimSpace(j.Output))
		if out != "" && strings.EqualFold(out, tsPath) {
			return true
		}
	}

	return false
}

func postworkLeftoverDoneMP4Exists(tsPath string) bool {
	tsPath = strings.TrimSpace(tsPath)
	if tsPath == "" {
		return false
	}

	s := getSettings()

	doneAbs, err := resolvePathRelativeToApp(s.DoneDir)
	if err != nil || strings.TrimSpace(doneAbs) == "" {
		doneAbs = strings.TrimSpace(s.DoneDir)
	}
	doneAbs = strings.TrimSpace(doneAbs)
	if doneAbs == "" {
		return false
	}

	base := strings.TrimSuffix(filepath.Base(tsPath), filepath.Ext(tsPath)) + ".mp4"
	donePath := filepath.Join(doneAbs, base)

	fi, err := os.Stat(donePath)
	return err == nil && fi != nil && !fi.IsDir() && fi.Size() > 0
}

func postworkLeftoverFilesStable(tsPath string, audioPath string) bool {
	tsPath = strings.TrimSpace(tsPath)
	audioPath = strings.TrimSpace(audioPath)
	if tsPath == "" || audioPath == "" {
		return false
	}

	sizeOf := func(p string) (int64, bool) {
		fi, err := os.Stat(p)
		if err != nil || fi == nil || fi.IsDir() || fi.Size() <= 0 {
			return 0, false
		}
		return fi.Size(), true
	}

	ts1, ok1 := sizeOf(tsPath)
	audio1, ok2 := sizeOf(audioPath)
	if !ok1 || !ok2 {
		return false
	}

	time.Sleep(1500 * time.Millisecond)

	ts2, ok1 := sizeOf(tsPath)
	audio2, ok2 := sizeOf(audioPath)
	if !ok1 || !ok2 {
		return false
	}

	return ts1 == ts2 && audio1 == audio2
}

func enqueuePostworkLeftover(tsPath string, tsInfo os.FileInfo) bool {
	tsPath = strings.TrimSpace(tsPath)
	if tsPath == "" || tsInfo == nil {
		return false
	}

	now := time.Now()
	startedAt := tsInfo.ModTime()
	if startedAt.IsZero() {
		startedAt = now
	}

	job := &RecordJob{
		ID:          uuid.NewString(),
		SourceURL:   "",
		Status:      JobFinished,
		StartedAt:   startedAt,
		StartedAtMs: startedAt.UnixMilli(),
		EndedAt:     &now,
		EndedAtMs:   now.UnixMilli(),
		Output:      tsPath,
		Phase:       "postwork",
		Progress:    0,
		SizeBytes:   tsInfo.Size(),
		Hidden:      false,
	}

	jobsMu.Lock()
	jobs[job.ID] = job
	jobsMu.Unlock()

	appLogln(
		"🧩 [startup-postwork] queued leftover:",
		filepath.Base(tsPath),
	)

	enqueuePostworkOrFail(job, tsPath, JobFinished)
	return true
}