#!/usr/bin/env python3
# SPDX-License-Identifier: BSD-2-Clause
"""Generate preview/index.html for a sound theme."""
from __future__ import annotations

import shutil
import subprocess
import sys
from pathlib import Path

TEMPLATE = Path(__file__).with_name("preview_template.html")


def duration(path: Path) -> float:
    ffp = shutil.which("ffprobe") or "ffprobe"
    return float(subprocess.run(
        [ffp, "-v", "error", "-show_entries", "format=duration",
         "-of", "default=nw=1:nk=1", str(path)],
        capture_output=True, text=True, check=True).stdout.strip())


def main() -> int:
    theme = Path(sys.argv[1])
    out = Path(sys.argv[2]) if len(sys.argv) > 2 else Path("preview/index.html")
    files = sorted((theme / "stereo").glob("*.oga"))
    names = ", ".join(f'["{f.stem}", {duration(f):.2f}]' for f in files
                      if f.stem != "theme-demo")
    html = TEMPLATE.read_text(encoding="utf-8")
    extra = {}
    for cand in (Path("preview.meta"), theme.parent / "preview.meta",
                 theme / "preview.meta"):
        if cand.is_file():
            meta = cand
            break
    else:
        meta = None
    if meta is not None:
        for line in meta.read_text(encoding="utf-8").splitlines():
            if "=" in line and not line.startswith("#"):
                k, v = line.split("=", 1)
                extra[k.strip()] = v.strip()
    extra.setdefault("title", theme.name)
    extra.setdefault("tagline", "")
    extra.setdefault("accent", "#2fb4d2")
    extra.setdefault("accent2", "#70c493")
    extra.setdefault("bg", "#0c1822")
    extra.setdefault("fg", "#d7e6ee")
    extra.setdefault("license", "CC BY-SA 4.0")
    extra["names"] = "[ " + names + " ]"
    extra["nsounds"] = str(len(files))
    out.parent.mkdir(parents=True, exist_ok=True)
    out.write_text(html.format(**extra), encoding="utf-8")
    print(f"scritto {out} ({len(files)} cue)")
    return 0


if __name__ == "__main__":
    sys.exit(main())