import type {
  AiAlteration,
  ContentCategory,
  Edl,
  EdlVideoClip,
  FaceRedaction,
  FfprobeReport,
  GateIssue,
  GateReport,
  NormalizedBox,
  PlatformProfile,
} from "@rakazo/contracts";
import { CONTENT_CATEGORIES, MAX_AUTO_FIX_ROUNDS } from "@rakazo/contracts";
import {
  BLENDED_TRANSITIONS,
  boxInsideSafeZone,
  clipLengthMs,
  edlDurationMs,
  locateOutputTimeAll,
  matchesAspect,
  sortedVideoClips,
} from "./edl.js";

/**
 * Tags a clean export may carry. Everything else is a metadata leak.
 *
 * - `title`: the only descriptive tag the compiler writes, and only when set.
 * - `major_brand`, `minor_version`, `compatible_brands`: the MP4 file-type
 *   box, always written by the muxer; it names the format, not the author.
 * - `handler_name`, `vendor_id`, `language`: per-stream boilerplate the MP4
 *   muxer writes ("VideoHandler", "[0][0][0][0]", "und").
 * - `encoder`: the MP4 sample description always names the codec. It is
 *   allowed only without a version number (bitexact output writes
 *   "Lavc libx264"); a versioned value such as "Lavf60.16.100" is a leak.
 *
 * `creation_time`, `location`, `com.apple.quicktime.*`, `make`, `model`,
 * `software`, GPS keys and anything unknown always count as leaks.
 */
export const METADATA_ALLOWED_TAGS: readonly string[] = [
  "title",
  "major_brand",
  "minor_version",
  "compatible_brands",
  "handler_name",
  "vendor_id",
  "language",
  "encoder",
];

const ALLOWED = new Set(METADATA_ALLOWED_TAGS);
/** "Lavf60.16.100", "Lavc60.31", "x264 core 164", "HandBrake 1.7.0". */
const VERSIONED = /\d+\.\d+|lav[cf]\d|core\s*\d/i;

/** Tag name without a "format." / "stream.0." style prefix, lower-cased. */
function tagName(key: string): string {
  return key
    .trim()
    .toLowerCase()
    .replace(/^(?:format|streams?(?:[.:/]\d+)?)[.:/]/, "");
}

export function findMetadataLeaks(tags: Record<string, string>): string[] {
  return Object.entries(tags)
    .filter(([key, value]) => {
      const name = tagName(key);
      if (!ALLOWED.has(name)) return true;
      if (name === "encoder") return VERSIONED.test(value);
      return false;
    })
    .map(([key]) => key)
    .sort();
}

export interface GateInput {
  profile: PlatformProfile;
  edl: Edl;
  ffprobe: FfprobeReport;
  /** Classifier scores on the rendered output. */
  content: Array<{ tMs: number; scores: Partial<Record<ContentCategory, number>> }>;
  /**
   * Faces re-detected on the rendered output. personId null means the face
   * could not be matched to a known person.
   */
  faces: Array<{ tMs: number; box: NormalizedBox; personId: string | null; coverage: number }>;
  /** Frames where tracking lost a face that must stay anonymized for longer than allowed. */
  trackingGaps: Array<{ startMs: number; endMs: number; personId: string | null }>;
  /** Residual visibility 0..1 of treated marks in the output. */
  marks: Array<{ markId: string; tMs: number; residualVisibility: number }>;
  /** People visible in the output with their protection and consent state. */
  people: Array<{
    id: string;
    anonymizeByDefault: string;
    consentRecordedAt: string | null;
    ageVerifiedAt: string | null;
  }>;
  copy: { title: string | null; caption: string | null; tags: string[] };
  aiAlterations: AiAlteration[];
  bundleHasDisclosure: boolean;
  watermarkBox: NormalizedBox | null;
  sampledFrames: number;
  autoFixRound: number;
  now: Date;
}

/** Longest tracking gap the anonymizer may bridge (spec 7). */
export const MAX_TRACKING_GAP_MS = 500;
/** Residual visibility of a treated mark above which the gate blocks. */
export const MAX_MARK_RESIDUAL = 0.05;
/** Loudness tolerance around the target, in LU. */
export const LOUDNESS_TOLERANCE_LU = 2;
const TRUE_PEAK_TOLERANCE_DB = 0.5;

const ms = (value: number) => Math.max(0, Math.round(value));

/** Merge time-sorted hits into ranges when they are at most `gapMs` apart. */
function ranges<T extends { tMs: number }>(hits: T[], gapMs: number): T[][] {
  const sorted = [...hits].sort((a, b) => a.tMs - b.tMs);
  const out: T[][] = [];
  for (const hit of sorted) {
    const last = out.at(-1);
    if (last && hit.tMs - last.at(-1)!.tMs <= gapMs) last.push(hit);
    else out.push([hit]);
  }
  return out;
}

export function checkTechnical(
  profile: PlatformProfile,
  edl: Edl,
  probe: FfprobeReport,
): GateIssue[] {
  const issues: GateIssue[] = [];
  const block = (code: string, message: string) =>
    issues.push({ check: "technical", severity: "block", code, message });
  if (probe.width !== edl.output.width || probe.height !== edl.output.height) {
    block(
      "resolution_mismatch",
      `output is ${probe.width}x${probe.height}, plan expects ${edl.output.width}x${edl.output.height}`,
    );
  }
  if (!matchesAspect(probe.width, probe.height, profile.video.aspectRatios)) {
    block("aspect_not_allowed", `${probe.width}x${probe.height} is not an allowed aspect ratio`);
  }
  if (Math.max(probe.width, probe.height) > Math.max(profile.video.width, profile.video.height)) {
    block("resolution_too_high", "output is larger than the profile allows");
  }
  if (
    Math.abs(probe.fps - edl.output.fps) > edl.output.fps * 0.01 ||
    probe.fps > profile.video.fps * 1.001
  ) {
    block("fps_mismatch", `output runs at ${probe.fps} fps`);
  }
  const frameMs = 1000 / Math.max(1, edl.output.fps);
  const expected = edlDurationMs(edl);
  if (probe.durationMs < profile.duration.hardMinMs - frameMs) {
    block("duration_too_short", `${probe.durationMs} ms is below ${profile.duration.hardMinMs} ms`);
  }
  if (probe.durationMs > profile.duration.hardMaxMs + frameMs) {
    block("duration_too_long", `${probe.durationMs} ms is above ${profile.duration.hardMaxMs} ms`);
  }
  if (Math.abs(probe.durationMs - expected) > Math.max(2 * frameMs, 100)) {
    issues.push({
      check: "technical",
      severity: "warn",
      code: "duration_drift",
      message: `output is ${probe.durationMs} ms, plan is ${expected} ms`,
    });
  }
  if (probe.sizeBytes > profile.video.maxFileSizeMb * 1_000_000) {
    block("file_too_large", `file is larger than ${profile.video.maxFileSizeMb} MB`);
  }
  const codec = probe.videoCodec.toLowerCase();
  const expectedCodec = profile.video.codec === "hevc" ? ["hevc", "h265"] : ["h264", "avc1"];
  if (!expectedCodec.includes(codec)) {
    block("codec_mismatch", `video codec ${probe.videoCodec} is not ${profile.video.codec}`);
  }
  if (probe.audioCodec !== null && probe.audioCodec.toLowerCase() !== "aac") {
    issues.push({
      check: "technical",
      severity: "warn",
      code: "audio_codec",
      message: `audio codec ${probe.audioCodec} is not AAC`,
    });
  }
  const target = edl.targetLufs ?? profile.audio.targetLufs;
  if (probe.audioCodec !== null) {
    if (probe.integratedLufs === null) {
      block("loudness_unmeasured", "loudness was not measured");
    } else if (Math.abs(probe.integratedLufs - target) > LOUDNESS_TOLERANCE_LU) {
      block("loudness_off_target", `${probe.integratedLufs} LUFS, target ${target} LUFS`);
    }
    if (
      probe.truePeakDb !== null &&
      probe.truePeakDb > profile.audio.truePeakDb + TRUE_PEAK_TOLERANCE_DB
    ) {
      block("true_peak_exceeded", `true peak ${probe.truePeakDb} dBTP`);
    }
  }
  const leaks = findMetadataLeaks(probe.tags);
  if (leaks.length > 0) block("metadata_leak", `metadata not removed: ${leaks.join(", ")}`);
  return issues;
}

const URL_PATTERN =
  /\b(?:https?:\/\/|www\.)\S+|\b[a-z0-9-]+(?:\.[a-z0-9-]+)*\.(?:com|net|org|io|de|at|ch|eu|ly|co|me|link|shop|store|app|tv|gg|xyz)\b(?:\/\S*)?/i;
const HASHTAG_PATTERN = /#[\p{L}\p{N}_]+/gu;

/** Profile patterns compile case-insensitively; an invalid one is reported, never thrown. */
function compilePattern(pattern: string): RegExp | null {
  try {
    return new RegExp(pattern, "i");
  } catch {
    return null;
  }
}

export function checkCopy(
  profile: PlatformProfile,
  copy: { title: string | null; caption: string | null; tags: string[] },
): GateIssue[] {
  const issues: GateIssue[] = [];
  const block = (code: string, message: string) =>
    issues.push({ check: "text", severity: "block", code, message });
  const { text } = profile;
  const title = copy.title ?? "";
  const caption = copy.caption ?? "";
  if (text.titleMaxChars !== undefined && [...title].length > text.titleMaxChars) {
    block(
      "title_too_long",
      `title has ${[...title].length} characters, limit ${text.titleMaxChars}`,
    );
  }
  if ([...caption].length > text.captionMaxChars) {
    block(
      "caption_too_long",
      `caption has ${[...caption].length} characters, limit ${text.captionMaxChars}`,
    );
  }
  const hashtags = new Set<string>();
  for (const tag of copy.tags) {
    const clean = tag.replace(/^#+/, "").trim().toLowerCase();
    if (clean) hashtags.add(clean);
  }
  for (const match of caption.matchAll(HASHTAG_PATTERN))
    hashtags.add(match[0].slice(1).toLowerCase());
  if (hashtags.size > text.hashtagLimit) {
    block("too_many_hashtags", `${hashtags.size} hashtags, limit ${text.hashtagLimit}`);
  }
  const fields: Array<[string, string]> = [
    ["title", title],
    ["caption", caption],
    ...copy.tags.map((tag, i): [string, string] => [`tags[${i}]`, tag]),
  ];
  for (const banned of text.bannedPatterns) {
    const regex = compilePattern(banned.pattern);
    if (!regex) {
      block("invalid_banned_pattern", `profile pattern cannot be checked: ${banned.reason}`);
      continue;
    }
    for (const [field, value] of fields) {
      if (value && regex.test(value)) block("banned_pattern", `${field}: ${banned.reason}`);
    }
  }
  if (text.linkPolicy !== "allowed") {
    for (const [field, value] of fields) {
      if (!value || !URL_PATTERN.test(value)) continue;
      if (text.linkPolicy === "forbidden") block("link_forbidden", `${field} contains a link`);
      else block("link_bio_only", `${field} contains a link; links belong in the bio`);
    }
  }
  return issues;
}

function checkContent(input: GateInput): GateIssue[] {
  const { profile } = input;
  const issues: GateIssue[] = [];
  const thresholds = profile.content.thresholds;
  const gapMs = (1000 / profile.content.sampleFps) * 1.5;
  const sampled = Math.max(input.content.length, input.sampledFrames, 1);
  for (const category of CONTENT_CATEGORIES) {
    const threshold = thresholds[category];
    if (threshold === undefined) continue;
    const hits = input.content.flatMap((sample) => {
      const score = sample.scores[category];
      return score !== undefined && score > threshold ? [{ tMs: sample.tMs, score }] : [];
    });
    if (hits.length === 0) continue;
    const blocking =
      profile.content.blockOn === "any_frame" ||
      hits.length / sampled > (profile.content.blockRatio ?? 0);
    for (const range of ranges(hits, gapMs)) {
      const score = Math.max(...range.map((h) => h.score));
      issues.push({
        check: "content",
        severity: blocking ? "block" : "warn",
        code: "content_threshold",
        message: `${category} ${score.toFixed(2)} above ${threshold}`,
        atMs: ms(range[0]!.tMs),
        endMs: ms(range.at(-1)!.tMs),
        category,
        score,
      });
    }
  }
  return issues;
}

function checkAnonymization(input: GateInput): GateIssue[] {
  const issues: GateIssue[] = [];
  const protectedIds = new Set(
    input.people.filter((p) => p.anonymizeByDefault !== "none").map((p) => p.id),
  );
  const gapMs = 1000;
  const uncovered = input.faces.filter(
    (face) => face.personId !== null && protectedIds.has(face.personId) && face.coverage < 1,
  );
  const byPerson = new Map<string, typeof uncovered>();
  for (const face of uncovered) {
    const list = byPerson.get(face.personId!) ?? [];
    list.push(face);
    byPerson.set(face.personId!, list);
  }
  for (const [personId, faces] of [...byPerson.entries()].sort((a, b) =>
    a[0].localeCompare(b[0]),
  )) {
    for (const range of ranges(faces, gapMs)) {
      const coverage = Math.min(...range.map((f) => f.coverage));
      issues.push({
        check: "anonymization",
        severity: "block",
        code: "face_not_covered",
        message: `face covered ${(coverage * 100).toFixed(0)} %`,
        atMs: ms(range[0]!.tMs),
        endMs: ms(range.at(-1)!.tMs),
        personId,
        score: coverage,
      });
    }
  }
  if (protectedIds.size > 0) {
    const unknown = input.faces.filter((face) => face.personId === null);
    for (const range of ranges(unknown, gapMs)) {
      issues.push({
        check: "anonymization",
        severity: "block",
        code: "unknown_face",
        message: "a face that cannot be matched appears next to a protected person",
        atMs: ms(range[0]!.tMs),
        endMs: ms(range.at(-1)!.tMs),
      });
    }
  }
  for (const gap of input.trackingGaps) {
    if (gap.endMs - gap.startMs <= MAX_TRACKING_GAP_MS) continue;
    issues.push({
      check: "anonymization",
      severity: "block",
      code: "tracking_gap",
      message: `face tracking lost for ${Math.round(gap.endMs - gap.startMs)} ms (needs review)`,
      atMs: ms(gap.startMs),
      endMs: ms(gap.endMs),
      ...(gap.personId ? { personId: gap.personId } : {}),
    });
  }
  const visibleMarks = input.marks.filter((mark) => mark.residualVisibility > MAX_MARK_RESIDUAL);
  const byMark = new Map<string, typeof visibleMarks>();
  for (const mark of visibleMarks) {
    const list = byMark.get(mark.markId) ?? [];
    list.push(mark);
    byMark.set(mark.markId, list);
  }
  for (const [markId, marks] of [...byMark.entries()].sort((a, b) => a[0].localeCompare(b[0]))) {
    for (const range of ranges(marks, gapMs)) {
      const residual = Math.max(...range.map((m) => m.residualVisibility));
      issues.push({
        check: "anonymization",
        severity: "block",
        code: "mark_visible",
        message: `treated mark still ${(residual * 100).toFixed(0)} % visible`,
        atMs: ms(range[0]!.tMs),
        endMs: ms(range.at(-1)!.tMs),
        markId,
        score: residual,
      });
    }
  }
  return issues;
}

function checkConsent(input: GateInput): GateIssue[] {
  const { consent } = input.profile;
  if (!consent.requirePerformerConsent && !consent.requireAgeVerification) return [];
  const issues: GateIssue[] = [];
  for (const person of [...input.people].sort((a, b) => a.id.localeCompare(b.id))) {
    if (consent.requirePerformerConsent && !person.consentRecordedAt) {
      issues.push({
        check: "consent",
        severity: "block",
        code: "consent_missing",
        message: "no recorded consent",
        personId: person.id,
      });
    }
    if (consent.requireAgeVerification && !person.ageVerifiedAt) {
      issues.push({
        check: "consent",
        severity: "block",
        code: "age_unverified",
        message: "age is not verified",
        personId: person.id,
      });
    }
  }
  for (const range of ranges(
    input.faces.filter((face) => face.personId === null),
    1000,
  )) {
    issues.push({
      check: "consent",
      severity: "block",
      code: "unknown_performer",
      message: "a visible face is not assigned to a person with consent",
      atMs: ms(range[0]!.tMs),
      endMs: ms(range.at(-1)!.tMs),
    });
  }
  return issues;
}

/** Deterministic gate (spec 6). Any blocking issue fails the report. */
export function evaluateGate(input: GateInput): GateReport {
  const { profile } = input;
  const issues: GateIssue[] = [
    ...checkTechnical(profile, input.edl, input.ffprobe),
    ...checkContent(input),
    ...checkAnonymization(input),
    ...checkConsent(input),
    ...checkCopy(profile, input.copy),
  ];
  const alterations = new Set([...input.aiAlterations, ...input.edl.metadata.aiAlterations]);
  if (
    alterations.size > 0 &&
    profile.disclosure.aiAlteredLabelRequired &&
    !input.bundleHasDisclosure
  ) {
    issues.push({
      check: "disclosure",
      severity: "block",
      code: "ai_label_missing",
      message: `AI alterations (${[...alterations].sort().join(", ")}) need the platform label`,
    });
  }
  if (input.watermarkBox && !boxInsideSafeZone(input.watermarkBox, profile)) {
    issues.push({
      check: "brand",
      severity: "warn",
      code: "watermark_outside_safe_zone",
      message: "watermark is covered by platform interface",
    });
  }
  return {
    profileId: profile.id,
    passed: !issues.some((issue) => issue.severity === "block"),
    checkedAt: input.now.toISOString(),
    sampledFrames: Math.max(0, Math.round(input.sampledFrames)),
    issues,
    autoFixRound: Math.min(MAX_AUTO_FIX_ROUNDS, Math.max(0, Math.round(input.autoFixRound))),
  };
}

export interface AutoFixResult {
  edl: Edl;
  changes: string[];
}

const PADDING_STEP = 25;
const CUT_MARGIN_MS = 500;
const MIN_KEEP_MS = 500;

/** Lay clips out back to back again, keeping blended transitions' overlap. */
function repack(edl: Edl): Edl {
  const clips = sortedVideoClips(edl);
  const ids = new Set(clips.map((c) => c.id));
  const transitions = edl.transitions.filter((t) => ids.has(t.fromClipId) && ids.has(t.toClipId));
  const adjacent = new Set<string>();
  for (let i = 0; i + 1 < clips.length; i++) adjacent.add(`${clips[i]!.id}>${clips[i + 1]!.id}`);
  const kept = transitions.filter((t) => adjacent.has(`${t.fromClipId}>${t.toClipId}`));
  const blend = new Map(
    kept
      .filter((t) => BLENDED_TRANSITIONS.has(t.kind) && t.durationMs > 0)
      .map((t) => [`${t.fromClipId}>${t.toClipId}`, t.durationMs]),
  );
  let cursor = 0;
  const packed: EdlVideoClip[] = clips.map((clip, i) => {
    const previous = clips[i - 1];
    let overlap = previous ? (blend.get(`${previous.id}>${clip.id}`) ?? 0) : 0;
    overlap = Math.min(overlap, clipLengthMs(clip) - 1, cursor);
    const atMs = Math.max(0, cursor - Math.max(0, overlap));
    cursor = atMs + clipLengthMs(clip);
    return { ...clip, atMs };
  });
  const regions = edl.redactions.regions.filter((r) => ids.has(r.clipId));
  const next = {
    ...edl,
    tracks: { ...edl.tracks, video: packed },
    transitions: kept.filter((t) => {
      if (!BLENDED_TRANSITIONS.has(t.kind)) return true;
      const from = packed.find((c) => c.id === t.fromClipId)!;
      const to = packed.find((c) => c.id === t.toClipId)!;
      return t.durationMs < Math.min(clipLengthMs(from), clipLengthMs(to));
    }),
    redactions: { ...edl.redactions, regions },
  };
  // Overlays never grow or move; they are only clamped to the new end.
  const total = edlDurationMs(next);
  next.overlays = edl.overlays.flatMap((overlay) => {
    if (overlay.atMs >= total) return [];
    return [{ ...overlay, durationMs: Math.min(overlay.durationMs, total - overlay.atMs) }];
  });
  return next;
}

/**
 * Compliance-only repairs: trim or drop offending clips, change crop, widen
 * redaction padding, swap to another segment. Never adds obfuscation aimed at
 * classifiers. Returns null when the round limit is reached or nothing safe applies.
 *
 * - Content blocks and tracking gaps: the clip showing that moment is swapped
 *   for an alternative segment of at least the same length that does not
 *   overlap the offending source range, else trimmed (when the range sits at
 *   one end) or dropped. The timeline is then repacked.
 * - Uncovered faces: padding of the person's face redaction grows by 25
 *   points; a missing redaction is added as blur.
 * - Unknown faces: the unassigned-face redaction grows or is added as blur.
 * - Visible marks: the mark treatment falls back to cover.
 */
export function planAutoFix(
  edl: Edl,
  report: GateReport,
  alternatives: Array<{ segmentId: string; assetId: string; startMs: number; endMs: number }>,
): AutoFixResult | null {
  if (report.autoFixRound >= MAX_AUTO_FIX_ROUNDS || report.passed) return null;
  const blocks = report.issues.filter((issue) => issue.severity === "block");
  const changes: string[] = [];
  let clips: EdlVideoClip[] = edl.tracks.video.map((clip) => ({ ...clip }));
  let faces: FaceRedaction[] = edl.redactions.faces.map((f) => ({ ...f }));
  let marks = edl.redactions.marks.map((m) => ({ ...m }));
  let clipsChanged = false;

  // Source ranges to remove, per clip.
  const offending = new Map<string, Array<{ start: number; end: number; reason: string }>>();
  for (const issue of blocks) {
    const timeline =
      issue.check === "content" ||
      issue.code === "tracking_gap" ||
      (issue.code === "mark_visible" &&
        !edl.redactions.marks.some((m) => m.markId === issue.markId));
    if (!timeline || issue.atMs === undefined) continue;
    const endMs = issue.endMs ?? issue.atMs;
    const step = Math.max(1, Math.floor(1000 / edl.output.fps));
    const times: number[] = [];
    for (let t = issue.atMs; t < endMs; t += step) times.push(t);
    times.push(endMs);
    for (const t of times) {
      for (const hit of locateOutputTimeAll(edl, t)) {
        const list = offending.get(hit.clipId) ?? [];
        const last = list.at(-1);
        if (last && last.reason === issue.code && hit.sourceMs - last.end <= step * 4) {
          last.end = Math.max(last.end, hit.sourceMs);
        } else {
          list.push({ start: hit.sourceMs, end: hit.sourceMs, reason: issue.code });
        }
        offending.set(hit.clipId, list);
      }
    }
  }
  const usedAlternatives = new Set<string>();
  for (const [clipId, found] of [...offending.entries()].sort((a, b) => a[0].localeCompare(b[0]))) {
    const clip = clips.find((c) => c.id === clipId);
    if (!clip) continue;
    const start = Math.max(clip.inMs, Math.min(...found.map((r) => r.start)) - CUT_MARGIN_MS);
    const end = Math.min(clip.outMs, Math.max(...found.map((r) => r.end)) + CUT_MARGIN_MS);
    const length = clip.outMs - clip.inMs;
    const alternative = alternatives
      .filter(
        (a) =>
          !usedAlternatives.has(a.segmentId) &&
          a.segmentId !== clip.segmentId &&
          a.endMs - a.startMs >= length &&
          !(a.assetId === clip.assetId && a.startMs < end && start < a.endMs),
      )
      .sort((a, b) => a.segmentId.localeCompare(b.segmentId))[0];
    clipsChanged = true;
    if (alternative) {
      usedAlternatives.add(alternative.segmentId);
      Object.assign(clip, {
        assetId: alternative.assetId,
        segmentId: alternative.segmentId,
        inMs: alternative.startMs,
        outMs: alternative.startMs + length,
        reframe: clip.reframe === "none" ? "none" : "auto",
      });
      changes.push(
        `clip ${clip.id}: swapped to segment ${alternative.segmentId} (${found[0]!.reason})`,
      );
    } else if (start - clip.inMs >= MIN_KEEP_MS && end >= clip.outMs - 1) {
      clip.outMs = start;
      changes.push(`clip ${clip.id}: trimmed the end at ${start} ms (${found[0]!.reason})`);
    } else if (clip.outMs - end >= MIN_KEEP_MS && start <= clip.inMs + 1) {
      clip.inMs = end;
      changes.push(`clip ${clip.id}: trimmed the start to ${end} ms (${found[0]!.reason})`);
    } else {
      clips = clips.filter((c) => c.id !== clip.id);
      changes.push(`clip ${clip.id}: removed (${found[0]!.reason})`);
    }
  }
  for (const clip of clips) {
    if (Array.isArray(clip.reframe)) {
      const inside = clip.reframe.filter((k) => k.tMs >= clip.inMs && k.tMs <= clip.outMs);
      clip.reframe = inside.length > 0 ? inside : "auto";
    }
  }

  const widen = (match: (f: FaceRedaction) => boolean, add: () => FaceRedaction, label: string) => {
    const existing = faces.filter(match);
    if (existing.length === 0) {
      faces = [...faces, add()];
      changes.push(`${label}: added blur redaction`);
      return;
    }
    for (const face of existing) {
      if (face.paddingPct >= 100) continue;
      face.paddingPct = Math.min(100, face.paddingPct + PADDING_STEP);
      changes.push(`${label}: redaction ${face.id} padding ${face.paddingPct} %`);
    }
  };
  const widened = new Set<string>();
  for (const issue of blocks) {
    if (issue.code === "face_not_covered" && issue.personId && !widened.has(issue.personId)) {
      const personId = issue.personId;
      widened.add(personId);
      widen(
        (f) => "personId" in f.target && f.target.personId === personId,
        () => ({
          id: `fix-face-${widened.size}`,
          target: { personId },
          mode: "blur",
          paddingPct: 20 + PADDING_STEP,
          featherPct: 10,
          minSizePct: 2,
        }),
        `person ${personId}`,
      );
    }
    if (issue.code === "unknown_face" && !widened.has("(unassigned)")) {
      widened.add("(unassigned)");
      widen(
        (f) => "unassignedFaces" in f.target,
        () => ({
          id: "fix-face-unassigned",
          target: { unassignedFaces: true },
          mode: "blur",
          paddingPct: 20 + PADDING_STEP,
          featherPct: 10,
          minSizePct: 2,
        }),
        "unassigned faces",
      );
    }
    if (issue.code === "mark_visible" && issue.markId) {
      const markId = issue.markId;
      marks = marks.map((mark) => {
        if (mark.markId !== markId || mark.treatment === "cover") return mark;
        changes.push(`mark ${markId}: ${mark.treatment} replaced by cover`);
        return { ...mark, treatment: "cover" as const };
      });
    }
  }
  if (changes.length === 0 || clips.length === 0) return null;

  let next: Edl = {
    ...edl,
    tracks: { ...edl.tracks, video: clips },
    redactions: { ...edl.redactions, faces, marks },
  };
  if (clipsChanged) next = repack(next);
  const stillAltered = new Set<AiAlteration>(
    next.metadata.aiAlterations.filter(
      (a) => a !== "inpaint" || marks.some((m) => m.treatment === "inpaint"),
    ),
  );
  const explicit = edl.metadata.aiAltered && edl.metadata.aiAlterations.length === 0;
  next.metadata = {
    ...next.metadata,
    aiAlterations: [...stillAltered],
    aiAltered: stillAltered.size > 0 || explicit,
  };
  return { edl: next, changes };
}