#!/usr/bin/env python3
"""
Batch-encode videos to the Hap family (hap / hap_q / hap_alpha / hap_q_alpha).
Only the newest non-Hap video per folder is encoded.
Outputs are written next to each source file with a Hap suffix in the filename.
"""

import os
import subprocess
import sys
from collections import defaultdict
from pathlib import Path

HAP_FORMAT = os.environ.get("HAP_FORMAT", "hap")
HAP_COMPRESSOR = os.environ.get("HAP_COMPRESSOR", "snappy")
FFMPEG_THREADS = os.environ.get("FFMPEG_THREADS", "0")

RED = "\033[0;31m"
GREEN = "\033[0;32m"
YELLOW = "\033[1;33m"
NC = "\033[0m"

VIDEO_EXTENSIONS = {".mp4", ".mov", ".avi", ".mkv", ".m4v", ".flv", ".wmv"}
HAP_SUFFIXES = ("_hap", "_hapq", "_hapalpha", "_hapqalpha")

FORMAT_TO_SUFFIX = {
    "hap": "hap",
    "hap_q": "hapq",
    "hap_alpha": "hapalpha",
    "hap_q_alpha": "hapqalpha",
}


def find_newest_per_folder(root: Path) -> list[Path]:
    """Group non-Hap video files by folder, return only the newest from each."""
    folders: dict[Path, list[Path]] = defaultdict(list)

    for path in root.rglob("*"):
        if not path.is_file():
            continue
        if path.suffix.lower() not in VIDEO_EXTENSIONS:
            continue
        if path.stem.endswith(HAP_SUFFIXES):
            continue
        folders[path.parent].append(path)

    newest = []
    for folder, files in sorted(folders.items()):
        files.sort(key=lambda f: f.stat().st_mtime, reverse=True)
        newest.append(files[0])
        if len(files) > 1:
            skipped = [f.name for f in files[1:]]
            print(
                f"{YELLOW}[{folder}] Picking newest: {files[0].name}, "
                f"skipping {len(skipped)} older: {', '.join(skipped)}{NC}"
            )

    return newest


def encode_video(input_file: Path, suffix: str) -> bool:
    output_file = input_file.parent / f"{input_file.stem}_{suffix}.mov"

    if output_file.exists():
        print(f"{YELLOW}Skipping {input_file} - output already exists{NC}")
        return True

    print(f"{GREEN}Encoding: {input_file}{NC}")
    print(f"  Output: {output_file}")

    result = subprocess.run(
        [
            "ffmpeg",
            "-nostdin",
            "-threads",
            FFMPEG_THREADS,
            "-i",
            str(input_file),
            "-vf",
            "pad=ceil(iw/4)*4:ceil(ih/4)*4",
            "-c:v",
            "hap",
            "-format",
            HAP_FORMAT,
            "-compressor",
            HAP_COMPRESSOR,
            "-an",
            "-y",
            str(output_file),
        ],
    )

    if result.returncode == 0:
        print(f"{GREEN}  Success{NC}")
        return True
    else:
        print(f"{RED}  Failed{NC}")
        return False


def main():
    if HAP_FORMAT not in FORMAT_TO_SUFFIX:
        print(
            f"{RED}Error: Unsupported HAP_FORMAT='{HAP_FORMAT}' "
            f"(use hap|hap_q|hap_alpha|hap_q_alpha){NC}"
        )
        sys.exit(1)

    if HAP_COMPRESSOR not in ("snappy", "none"):
        print(
            f"{RED}Error: Unsupported HAP_COMPRESSOR='{HAP_COMPRESSOR}' "
            f"(use snappy|none){NC}"
        )
        sys.exit(1)

    try:
        subprocess.run(["ffmpeg", "-version"], capture_output=True, check=True)
    except (FileNotFoundError, subprocess.CalledProcessError):
        print(f"{RED}Error: ffmpeg is not installed or not in PATH{NC}")
        sys.exit(1)

    suffix = FORMAT_TO_SUFFIX[HAP_FORMAT]
    root = Path(".")

    print(f"{GREEN}Searching for video files (newest per folder)...{NC}")
    print()

    candidates = find_newest_per_folder(root)

    if not candidates:
        print(f"{YELLOW}No video files found.{NC}")
        return

    print()

    success = 0
    failed = 0

    for file in candidates:
        if encode_video(file, suffix):
            success += 1
        else:
            failed += 1
        print()

    print(f"{GREEN}{'=' * 40}{NC}")
    print(f"{GREEN}Encoding complete!{NC}")
    print(f"Folders processed: {len(candidates)}")
    print(f"{GREEN}Successfully encoded: {success}{NC}")
    if failed > 0:
        print(f"{RED}Failed: {failed}{NC}")
    print(f"{GREEN}{'=' * 40}{NC}")


if __name__ == "__main__":
    main()