#!/usr/bin/env python3
"""zwo.py — CLI for creating, validating, previewing and publishing Zwift .zwo workouts.

Commands
--------
  build <spec.json> [-o out.zwo] [--preview] [--publish]
  from-template <name> [--title T] [-o out.zwo] [--preview] [--publish]
  validate <file.zwo>
  parse <file.zwo> [--json]
  render <file.zwo|spec.json>
  templates

Exit codes: 0 = ok, 1 = validation/usage error.
"""

from __future__ import annotations

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

sys.path.insert(0, str(Path(__file__).resolve().parent))
import zwo_builder as zb  # noqa: E402

HOSTING_SCRIPT = Path("/home/node/mop-skills/mop-skills/skills/hosting/scripts/publish_file.py")


def _slug(text: str) -> str:
    s = re.sub(r"[^a-z0-9]+", "-", text.lower()).strip("-")
    return s or "workout"


def _load_spec(path: str) -> dict:
    with open(path, encoding="utf-8") as fh:
        return json.load(fh)


def _publish(zwo_path: Path, title: str) -> str | None:
    """Publish the .zwo via the hosting skill. Returns the public URL or None."""
    if not HOSTING_SCRIPT.exists():
        print(f"⚠️  hosting publisher not found at {HOSTING_SCRIPT}", file=sys.stderr)
        return None
    cmd = [sys.executable, str(HOSTING_SCRIPT), "--file", str(zwo_path),
           "--category", "docs", "--slug", _slug(title)]
    try:
        out = subprocess.run(cmd, capture_output=True, text=True, timeout=120)
    except Exception as exc:  # noqa: BLE001
        print(f"⚠️  hosting publish failed: {exc}", file=sys.stderr)
        return None
    url = None
    for line in out.stdout.splitlines():
        if line.startswith("URL:"):
            url = line.split("URL:", 1)[1].strip()
    if not url:
        print(out.stdout, out.stderr, file=sys.stderr)
    return url


def cmd_build(args: argparse.Namespace) -> int:
    spec = _load_spec(args.spec)
    warnings = zb.validate_spec(spec)
    out = Path(args.output or f"{_slug(spec['name'])}.zwo")
    zb.write_zwo(spec, str(out))
    print(f"✅ {out}  ({out.stat().st_size} bytes)")
    for w in warnings:
        print(f"⚠️  {w}")
    if args.preview:
        print()
        print(zb.render_text(spec))
    if args.publish:
        url = _publish(out, spec["name"])
        if url:
            print(f"🔗 {url}")
    return 0


def cmd_from_template(args: argparse.Namespace) -> int:
    spec = zb.from_template(args.name, args.title)
    out = Path(args.output or f"{_slug(spec['name'])}.zwo")
    zb.write_zwo(spec, str(out))
    print(f"✅ {out}  ({out.stat().st_size} bytes)")
    print()
    print(zb.render_text(spec))
    if args.publish:
        url = _publish(out, spec["name"])
        if url:
            print(f"🔗 {url}")
    return 0


def cmd_validate(args: argparse.Namespace) -> int:
    ok, messages = zb.validate_file(args.file)
    if ok:
        print(f"✅ {args.file} is a valid .zwo file")
        for m in messages:
            print(f"⚠️  {m}")
        return 0
    print(f"❌ {args.file} is invalid:")
    for m in messages:
        print(f"   - {m}")
    return 1


def cmd_parse(args: argparse.Namespace) -> int:
    spec = zb.parse_file(args.file)
    if args.json:
        print(json.dumps(spec, ensure_ascii=False, indent=2))
    else:
        print(zb.render_text(spec))
    return 0


def cmd_render(args: argparse.Namespace) -> int:
    if args.file.endswith(".json"):
        spec = _load_spec(args.file)
    else:
        spec = zb.parse_file(args.file)
    print(zb.render_text(spec))
    return 0


def cmd_templates(_: argparse.Namespace) -> int:
    for t in zb.templates():
        print(t)
    return 0


def main(argv: list[str] | None = None) -> int:
    parser = argparse.ArgumentParser(prog="zwo.py", description="Zwift .zwo workout toolkit (bike-only)")
    sub = parser.add_subparsers(dest="command", required=True)

    p = sub.add_parser("build", help="build a .zwo from a JSON spec")
    p.add_argument("spec")
    p.add_argument("-o", "--output")
    p.add_argument("--preview", action="store_true", help="print the human-readable preview")
    p.add_argument("--publish", action="store_true", help="upload via the hosting skill")
    p.set_defaults(func=cmd_build)

    p = sub.add_parser("from-template", help="build from a built-in deterministic template")
    p.add_argument("name")
    p.add_argument("--title")
    p.add_argument("-o", "--output")
    p.add_argument("--publish", action="store_true")
    p.set_defaults(func=cmd_from_template)

    p = sub.add_parser("validate", help="validate an existing .zwo file")
    p.add_argument("file")
    p.set_defaults(func=cmd_validate)

    p = sub.add_parser("parse", help="parse a .zwo into a JSON spec")
    p.add_argument("file")
    p.add_argument("--json", action="store_true")
    p.set_defaults(func=cmd_parse)

    p = sub.add_parser("render", help="render a human-readable preview")
    p.add_argument("file")
    p.set_defaults(func=cmd_render)

    p = sub.add_parser("templates", help="list built-in templates")
    p.set_defaults(func=cmd_templates)

    args = parser.parse_args(argv)
    try:
        return args.func(args)
    except zb.ZwoValidationError as exc:
        print(f"❌ validation error: {exc}", file=sys.stderr)
        return 1
    except (OSError, json.JSONDecodeError) as exc:
        print(f"❌ {exc}", file=sys.stderr)
        return 1


if __name__ == "__main__":
    raise SystemExit(main())