From 122c2d09ecec4007bfa25c26ca45d48ba81248fc Mon Sep 17 00:00:00 2001
From: Bel LaPointe <153096461+breel-render@users.noreply.github.com>
Date: Wed, 18 Sep 2024 00:45:35 -0400
Subject: [PATCH] k

---
 testdata/ffmpeg.d/cmd/prune/main.go | 155 ++++++++++++++++++++++++++++
 testdata/ffmpeg.d/go.mod            |   3 +
 2 files changed, 158 insertions(+)
 create mode 100644 testdata/ffmpeg.d/cmd/prune/main.go
 create mode 100644 testdata/ffmpeg.d/go.mod

diff --git a/testdata/ffmpeg.d/cmd/prune/main.go b/testdata/ffmpeg.d/cmd/prune/main.go
new file mode 100644
index 0000000..8f8065c
--- /dev/null
+++ b/testdata/ffmpeg.d/cmd/prune/main.go
@@ -0,0 +1,155 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"math/big"
+	"os"
+	"os/exec"
+	"os/signal"
+	"path"
+	"slices"
+	"sort"
+	"strconv"
+	"strings"
+	"syscall"
+	"time"
+)
+
+func main() {
+	ctx, can := signal.NotifyContext(context.Background(), syscall.SIGINT)
+	defer can()
+
+	if err := Run(ctx, os.Args[1:]); err != nil {
+		panic(err)
+	}
+}
+
+func Run(ctx context.Context, args []string) error {
+	cams, err := lsd(args[0])
+	if err != nil {
+		return err
+	}
+
+	for _, cam := range cams {
+		files, err := lsf(cam)
+		if err != nil {
+			return err
+		} else if len(files) < 1 {
+			continue
+		}
+
+		lastChunk := strings.Split(path.Base(files[len(files)-1]), ".")[0]
+		files = slices.DeleteFunc(files, func(f string) bool {
+			return strings.Contains(f, lastChunk)
+		})
+		if len(files) == 0 {
+			continue
+		}
+
+		lastMovementAt := time.Unix(0, 0)
+		prevF := files[0]
+		for _, f := range files[1:] {
+			prev, err := os.Stat(prevF)
+			if err != nil {
+				return err
+			}
+
+			if ok, err := hasMovement(ctx, prevF, f); err != nil {
+				return err
+			} else if ok {
+				lastMovementAt = prev.ModTime()
+			}
+
+			target := "trash"
+			if prev.ModTime().Before(lastMovementAt.Add(3 * time.Minute)) {
+				target = "movement"
+			}
+			if err := func() error {
+				gName := strings.ReplaceAll(prevF, "record", target)
+				if gName == prevF {
+					return fmt.Errorf("would overwrite original %s", prevF)
+				}
+				os.MkdirAll(path.Dir(gName), os.ModePerm)
+
+				f, err := os.Open(prevF)
+				if err != nil {
+					return err
+				}
+				defer f.Close()
+
+				g, err := os.Create(gName)
+				if err != nil {
+					return err
+				}
+				defer g.Close()
+
+				if _, err := io.Copy(g, f); err != nil {
+					return err
+				}
+
+				return os.Remove(prevF)
+			}(); err != nil {
+				return err
+			}
+
+			prevF = f
+		}
+	}
+	return nil
+}
+
+func hasMovement(ctx context.Context, a, b string) (bool, error) {
+	sizeOfCmd := exec.CommandContext(ctx, "identify", a)
+	sizeOfOutput, err := sizeOfCmd.CombinedOutput()
+	if err != nil {
+		return false, fmt.Errorf("failed to identify %s: (%w) %s", a, err, sizeOfOutput)
+	}
+	hw := strings.Fields(string(sizeOfOutput))[2]
+	h, err := strconv.ParseInt(strings.Split(hw, "x")[0], 10, 16)
+	if err != nil {
+		return false, err
+	}
+	w, err := strconv.ParseInt(strings.Split(hw, "x")[1], 10, 16)
+	if err != nil {
+		return false, err
+	}
+	total := h * w
+
+	compareCmd := exec.CommandContext(ctx, "compare", "-metric", "AE", "-fuzz", "15%", a, b, "/dev/null")
+	compareOutput, _ := compareCmd.CombinedOutput()
+
+	f, _, err := big.ParseFloat(string(compareOutput), 10, 0, big.ToNearestEven)
+	if err != nil {
+		return false, err
+	}
+	i := new(big.Int)
+	f.Int(i)
+	delta := i.Int64()
+
+	percentPixelsChanged := int(100.0 * float64(delta) / float64(total))
+	return percentPixelsChanged > 10, nil
+}
+
+func lsd(d string) ([]string, error) {
+	return ls(d, true)
+}
+
+func lsf(d string) ([]string, error) {
+	return ls(d, false)
+}
+
+func ls(d string, dirs bool) ([]string, error) {
+	entries, err := os.ReadDir(d)
+
+	results := make([]string, 0, len(entries))
+	for i := range entries {
+		if dirs == entries[i].IsDir() {
+			results = append(results, path.Join(d, entries[i].Name()))
+		}
+	}
+	sort.Strings(results)
+
+	return results, err
+}
diff --git a/testdata/ffmpeg.d/go.mod b/testdata/ffmpeg.d/go.mod
new file mode 100644
index 0000000..638ad89
--- /dev/null
+++ b/testdata/ffmpeg.d/go.mod
@@ -0,0 +1,3 @@
+module ffmpeg.d
+
+go 1.22.3