#!/usr/bin/env python3
"""Screenshot-rename pipeline.

Three subcommands:
  prep    — extract frames, resize, build manifest, split into batches
  plan    — aggregate desc-*.tsv files, validate, write rename plan
  execute — apply the plan with safety checks

The Haiku-subagent dispatch step happens between `prep` and `plan` and is
performed by Claude Code in-session, not by this script.
"""

import argparse
import os
import re
import shutil
import subprocess
import sys
from pathlib import Path

WORK = Path("/tmp/screenshot-rename")
FRAMES = WORK / "frames"
SMALL = WORK / "small"


def run(cmd, **kw):
    return subprocess.run(cmd, capture_output=True, text=True, **kw)


def title_case(s: str) -> str:
    return " ".join(w.capitalize() for w in s.split())


# ---------- prep ----------

def prep(src: Path, batch_size: int, prefix: str) -> None:
    if not src.is_dir():
        sys.exit(f"source not a directory: {src}")
    WORK.mkdir(parents=True, exist_ok=True)
    FRAMES.mkdir(exist_ok=True)
    SMALL.mkdir(exist_ok=True)

    pattern = re.compile(rf"^{re.escape(prefix)}\s+\d{{4}}-\d{{2}}-\d{{2}}.*$")
    files = sorted(p for p in src.iterdir() if p.is_file() and pattern.match(p.name))
    if not files:
        sys.exit(f"no matching files (prefix='{prefix}') in {src}")
    print(f"found {len(files)} source files")

    manifest = WORK / "all.tsv"
    with manifest.open("w") as out:
        for f in files:
            base = f.stem
            ext = f.suffix.lower()
            if ext in (".mp4", ".mov"):
                frame = FRAMES / f"{base}.jpg"
                if not frame.exists():
                    r = run(["ffmpeg", "-y", "-ss", "1", "-i", str(f),
                             "-frames:v", "1", "-q:v", "3", str(frame)])
                    if not frame.exists():
                        print(f"WARN ffmpeg failed: {f.name}", file=sys.stderr)
                        continue
                vision_src = frame
            elif ext == ".pdf":
                frame = FRAMES / f"{base}.jpg"
                if not frame.exists():
                    run(["sips", "-s", "format", "jpeg", str(f), "--out", str(frame)])
                if not frame.exists():
                    print(f"WARN sips failed on pdf: {f.name}", file=sys.stderr)
                    continue
                vision_src = frame
            elif ext in (".png", ".gif", ".jpg", ".jpeg", ".webp"):
                vision_src = f
            else:
                print(f"SKIP unknown ext: {f.name}", file=sys.stderr)
                continue

            small = SMALL / f"{base}.jpg"
            if not small.exists():
                run(["sips", "-Z", "1568", "-s", "format", "jpeg",
                     str(vision_src), "--out", str(small)])
            if not small.exists():
                print(f"WARN resize failed: {f.name}", file=sys.stderr)
                continue
            out.write(f"{small}\t{f.name}\n")

    # split into batches
    for old in WORK.glob("full-batch-*"):
        old.unlink()
    lines = manifest.read_text().splitlines()
    n_batches = max(1, (len(lines) + batch_size - 1) // batch_size)
    for i in range(n_batches):
        chunk = lines[i * batch_size:(i + 1) * batch_size]
        (WORK / f"full-batch-{i+1:02d}").write_text("\n".join(chunk) + "\n")
    print(f"prepped {len(lines)} files into {n_batches} batches in {WORK}")
    print(f"\nDispatch {n_batches} Haiku subagents (one per batch).")
    print(f"After all desc-full-NN.tsv files exist, run: pipeline.py plan --src '{src}'")


# ---------- plan ----------

def plan(src: Path, prefix: str, max_words: int) -> None:
    if not src.is_dir():
        sys.exit(f"source not a directory: {src}")
    descs = sorted(WORK.glob("desc-full-*.tsv"))
    if not descs:
        sys.exit("no desc-full-*.tsv files found in /tmp/screenshot-rename")
    all_lines = []
    for p in descs:
        all_lines.extend(p.read_text().splitlines())
    print(f"aggregated {len(all_lines)} description lines from {len(descs)} batches")

    existing = set(os.listdir(src))
    plan_rows = []
    errors = []
    seen = {}

    for lineno, line in enumerate(all_lines, 1):
        line = line.rstrip()
        if not line:
            continue
        parts = line.split("\t", 1)
        if len(parts) != 2:
            errors.append(f"L{lineno}: bad split: {line!r}")
            continue
        orig_claimed, desc = parts

        if not orig_claimed.startswith(prefix + " "):
            errors.append(f"L{lineno}: prefix: {orig_claimed!r}")
            continue

        # Find the actual file — Haiku occasionally returns .jpg instead of .png
        orig = orig_claimed
        if orig not in existing:
            base = os.path.splitext(orig_claimed)[0]
            for ext in (".png", ".gif", ".mp4", ".pdf", ".jpg", ".jpeg", ".webp"):
                cand = base + ext
                if cand in existing:
                    orig = cand
                    break
            else:
                errors.append(f"L{lineno}: source not found: {orig_claimed!r}")
                continue

        words = desc.split()
        if len(words) < 6:
            errors.append(f"L{lineno}: <6 words: {orig!r} -> {desc!r}")
            continue
        words = words[:max_words]
        cleaned = []
        for w in words:
            cw = "".join(c for c in w if c.isalnum())
            if cw:
                cleaned.append(cw)
        if len(cleaned) < 6:
            errors.append(f"L{lineno}: <6 after sanitize: {desc!r}")
            continue
        cleaned = cleaned[:max_words]
        titled = title_case(" ".join(cleaned))

        rest = orig[len(prefix) + 1:]  # everything after "Prefix "
        new = f"{prefix} - {titled} - {rest}"

        if new == orig:
            errors.append(f"L{lineno}: same: {orig!r}")
            continue
        if new in existing:
            errors.append(f"L{lineno}: target exists in DEST: {new!r}")
            continue
        if new in seen:
            errors.append(f"L{lineno}: plan collision: {new!r} from {orig!r} and {seen[new]!r}")
            continue
        seen[new] = orig
        plan_rows.append((orig, new))

    print(f"plan: {len(plan_rows)} renames, {len(errors)} errors")
    if errors:
        print("\nERRORS:")
        for e in errors[:30]:
            print(f"  {e}")
        if len(errors) > 30:
            print(f"  ... and {len(errors) - 30} more")

    plan_path = WORK / "plan-full.tsv"
    with plan_path.open("w") as f:
        for orig, new in plan_rows:
            f.write(f"{orig}\t{new}\n")
    print(f"\nplan saved: {plan_path}")
    print(f"sample (every {max(1, len(plan_rows)//6)}th row):")
    step = max(1, len(plan_rows) // 6)
    for i in range(0, len(plan_rows), step):
        orig, new = plan_rows[i]
        print(f"  {orig}\n   → {new}\n")
    print(f"if plan looks good: pipeline.py execute --src '{src}'")


# ---------- execute ----------

def execute(src: Path) -> None:
    if not src.is_dir():
        sys.exit(f"source not a directory: {src}")
    plan_path = WORK / "plan-full.tsv"
    if not plan_path.exists():
        sys.exit(f"no plan: {plan_path} (run `pipeline.py plan` first)")

    before = len(os.listdir(src))
    ok = 0
    fail = 0
    fails = []
    with plan_path.open() as f:
        for line in f:
            line = line.rstrip()
            if not line:
                continue
            orig, new = line.split("\t", 1)
            srcp = src / orig
            dstp = src / new
            if not srcp.exists():
                fails.append(f"src missing: {orig}")
                fail += 1
                continue
            if dstp.exists():
                fails.append(f"target exists: {new}")
                fail += 1
                continue
            try:
                os.rename(srcp, dstp)
                if dstp.exists() and not srcp.exists():
                    ok += 1
                else:
                    fails.append(f"post-check failed: {orig}")
                    fail += 1
            except OSError as e:
                fails.append(f"rename error {orig}: {e}")
                fail += 1

    after = len(os.listdir(src))
    print(f"ok={ok} fail={fail} before={before} after={after}")
    if before != after:
        print("⚠ FILE COUNT CHANGED — investigate immediately")
        sys.exit(2)
    print("file count unchanged ✓")
    if fails:
        fails_path = WORK / "rename-fails.txt"
        fails_path.write_text("\n".join(fails))
        print(f"failures logged: {fails_path}")
        for x in fails[:5]:
            print(f"  {x}")


# ---------- main ----------

def main() -> None:
    p = argparse.ArgumentParser(description=__doc__)
    sub = p.add_subparsers(dest="cmd", required=True)

    p_prep = sub.add_parser("prep", help="extract frames, resize, build batches")
    p_prep.add_argument("--src", type=Path, required=True)
    p_prep.add_argument("--batch-size", type=int, default=19)
    p_prep.add_argument("--prefix", default="CleanShot",
                        help="filename prefix to match (default CleanShot)")

    p_plan = sub.add_parser("plan", help="build & validate rename plan")
    p_plan.add_argument("--src", type=Path, required=True)
    p_plan.add_argument("--prefix", default="CleanShot")
    p_plan.add_argument("--max-words", type=int, default=8)

    p_exec = sub.add_parser("execute", help="apply rename plan with safety checks")
    p_exec.add_argument("--src", type=Path, required=True)

    args = p.parse_args()
    if args.cmd == "prep":
        prep(args.src, args.batch_size, args.prefix)
    elif args.cmd == "plan":
        plan(args.src, args.prefix, args.max_words)
    elif args.cmd == "execute":
        execute(args.src)


if __name__ == "__main__":
    main()