#!/usr/bin/env python3
"""gitea_inventory.py — compare Gitea repos against state-hub registered repos.

Outputs three sections:
  1. Registered   — in both Gitea and state-hub (shows last_state_synced_at)
  2. Unregistered — on Gitea but not in state-hub (candidates for onboarding)
  3. Hub-only     — in state-hub but no matching Gitea repo (local/stale)

Usage:
    uv run python scripts/gitea_inventory.py [--json] [--api-base URL]
    make gitea-inventory
    make gitea-inventory JSON=1

Environment (from .env or shell):
    GITEA_URL    — base URL, e.g. http://92.205.130.254:32166
    GITEA_TOKEN  — personal access token (needs read:repo scope)
    API_BASE     — state-hub API, default http://127.0.0.1:8000
"""
from __future__ import annotations

import argparse
import json
import os
import sys
import urllib.parse
import urllib.request
from datetime import datetime, timezone


# ---------------------------------------------------------------------------
# Config
# ---------------------------------------------------------------------------

DEFAULT_API_BASE = "http://127.0.0.1:8000"
DEFAULT_GITEA_URL = "http://92.205.130.254:32166"
GITEA_ORG = "coulomb"


def _load_env() -> None:
    """Load .env file from state-hub root if present (simple key=value parser)."""
    env_path = os.path.join(os.path.dirname(__file__), "..", ".env")
    env_path = os.path.normpath(env_path)
    if not os.path.exists(env_path):
        return
    with open(env_path) as f:
        for line in f:
            line = line.strip()
            if not line or line.startswith("#") or "=" not in line:
                continue
            key, _, val = line.partition("=")
            key = key.strip()
            val = val.strip().strip('"').strip("'")
            if key and key not in os.environ:
                os.environ[key] = val


# ---------------------------------------------------------------------------
# HTTP helpers
# ---------------------------------------------------------------------------

def _get(url: str, token: str | None = None) -> dict | list:
    req = urllib.request.Request(url)
    if token:
        req.add_header("Authorization", f"token {token}")
    req.add_header("Accept", "application/json")
    try:
        with urllib.request.urlopen(req, timeout=10) as resp:
            return json.loads(resp.read().decode())
    except Exception as exc:
        print(f"  HTTP error: {url} → {exc}", file=sys.stderr)
        return []


def _gitea_pages(base_url: str, path: str, token: str | None) -> list[dict]:
    """Paginate through a Gitea list endpoint."""
    results = []
    page = 1
    while True:
        url = f"{base_url}{path}?limit=50&page={page}"
        data = _get(url, token)
        if not isinstance(data, list) or not data:
            break
        results.extend(data)
        if len(data) < 50:
            break
        page += 1
    return results


# ---------------------------------------------------------------------------
# Fetch data
# ---------------------------------------------------------------------------

def fetch_gitea_repos(gitea_url: str, token: str | None) -> list[dict]:
    """Return all repos in the coulomb org (+ user repos if token is set)."""
    org_repos = _gitea_pages(gitea_url, f"/api/v1/orgs/{GITEA_ORG}/repos", token)
    # Also fetch user repos that may not be in the org
    user_repos = _gitea_pages(gitea_url, "/api/v1/user/repos", token) if token else []
    # Deduplicate by full_name
    seen: set[str] = set()
    combined = []
    for r in org_repos + user_repos:
        name = r.get("full_name", "")
        if name not in seen:
            seen.add(name)
            combined.append(r)
    return combined


def fetch_hub_repos(api_base: str) -> list[dict]:
    return _get(f"{api_base}/repos/") or []  # type: ignore[return-value]


# ---------------------------------------------------------------------------
# Match logic
# ---------------------------------------------------------------------------

def _slug_candidates(gitea_repo: dict) -> set[str]:
    """Slug candidates from a Gitea repo entry."""
    name = gitea_repo.get("name", "")
    # state-hub slugs are kebab-case; gitea names may use _ or -
    return {name, name.replace("_", "-"), name.lower(), name.lower().replace("_", "-")}


def build_report(gitea_repos: list[dict], hub_repos: list[dict]) -> dict:
    hub_by_slug: dict[str, dict] = {r["slug"]: r for r in hub_repos}
    hub_matched: set[str] = set()

    registered = []
    unregistered = []

    for gr in gitea_repos:
        candidates = _slug_candidates(gr)
        matched_slug = next((c for c in candidates if c in hub_by_slug), None)
        if matched_slug:
            hub_matched.add(matched_slug)
            hr = hub_by_slug[matched_slug]
            registered.append({
                "slug": matched_slug,
                "gitea_name": gr.get("name"),
                "gitea_url": gr.get("html_url"),
                "domain": hr.get("domain_slug"),
                "status": hr.get("status"),
                "last_state_synced_at": hr.get("last_state_synced_at"),
                "last_sbom_at": hr.get("last_sbom_at"),
            })
        else:
            unregistered.append({
                "gitea_name": gr.get("name"),
                "gitea_url": gr.get("html_url"),
                "description": gr.get("description") or "",
                "language": gr.get("language") or "",
                "stars": gr.get("stars_count", 0),
            })

    hub_only = [
        {"slug": slug, "domain": r.get("domain_slug"), "status": r.get("status")}
        for slug, r in hub_by_slug.items()
        if slug not in hub_matched
    ]

    return {
        "generated_at": datetime.now(timezone.utc).isoformat(),
        "registered": registered,
        "unregistered": unregistered,
        "hub_only": hub_only,
    }


# ---------------------------------------------------------------------------
# Rendering
# ---------------------------------------------------------------------------

def _age(ts: str | None) -> str:
    if not ts:
        return "never"
    try:
        dt = datetime.fromisoformat(ts.replace("Z", "+00:00"))
        delta = datetime.now(timezone.utc) - dt
        h = int(delta.total_seconds() // 3600)
        if h < 1:
            return f"{int(delta.total_seconds() // 60)}m ago"
        if h < 24:
            return f"{h}h ago"
        return f"{delta.days}d ago"
    except Exception:
        return ts


def render_text(report: dict) -> str:
    SEP = "=" * 70
    lines = [
        "Custodian Gitea Inventory",
        f"Generated: {report['generated_at']}",
        SEP,
    ]

    # Registered
    reg = report["registered"]
    lines.append(f"\n✅ REGISTERED ({len(reg)}) — in both Gitea and state-hub")
    if reg:
        lines.append(f"  {'slug':<30} {'domain':<20} {'synced':<15} {'sbom'}")
        lines.append(f"  {'-'*28} {'-'*18} {'-'*13} {'-'*13}")
        for r in sorted(reg, key=lambda x: x["slug"]):
            synced = _age(r["last_state_synced_at"])
            sbom = _age(r["last_sbom_at"])
            lines.append(f"  {r['slug']:<30} {(r['domain'] or ''):<20} {synced:<15} {sbom}")
    else:
        lines.append("  (none)")

    # Unregistered
    unreg = report["unregistered"]
    lines.append(f"\n⚠  UNREGISTERED ({len(unreg)}) — on Gitea but not in state-hub")
    if unreg:
        for r in sorted(unreg, key=lambda x: x["gitea_name"]):
            desc = f" — {r['description']}" if r["description"] else ""
            lang = f" [{r['language']}]" if r["language"] else ""
            lines.append(f"  {r['gitea_name']}{lang}{desc}")
        lines.append(f"\n  To onboard: make register-project DOMAIN=<domain> PROJECT_PATH=/home/worsch/<slug>")
    else:
        lines.append("  (none — all Gitea repos are registered 🎉)")

    # Hub-only
    hub_only = report["hub_only"]
    lines.append(f"\n🔵 HUB-ONLY ({len(hub_only)}) — in state-hub but no matching Gitea repo")
    if hub_only:
        for r in sorted(hub_only, key=lambda x: x["slug"]):
            lines.append(f"  {r['slug']:<30} domain={r['domain'] or '?'}  status={r['status']}")
    else:
        lines.append("  (none)")

    lines.append(f"\n{SEP}")
    return "\n".join(lines)


# ---------------------------------------------------------------------------
# Main
# ---------------------------------------------------------------------------

def main() -> None:
    _load_env()

    parser = argparse.ArgumentParser(description=__doc__,
                                     formatter_class=argparse.RawDescriptionHelpFormatter)
    parser.add_argument("--json", action="store_true", help="Output JSON instead of text")
    parser.add_argument("--api-base", default=os.environ.get("API_BASE", DEFAULT_API_BASE))
    args = parser.parse_args()

    gitea_url = os.environ.get("GITEA_URL", DEFAULT_GITEA_URL).rstrip("/")
    token = os.environ.get("GITEA_TOKEN") or None

    if not token:
        print("⚠  GITEA_TOKEN not set — only public repos will be visible", file=sys.stderr)

    print("Fetching Gitea repos...", file=sys.stderr)
    gitea_repos = fetch_gitea_repos(gitea_url, token)
    print(f"  {len(gitea_repos)} repos found on Gitea", file=sys.stderr)

    print("Fetching state-hub repos...", file=sys.stderr)
    hub_repos = fetch_hub_repos(args.api_base)
    print(f"  {len(hub_repos)} repos registered in hub", file=sys.stderr)

    report = build_report(gitea_repos, hub_repos)

    if args.json:
        print(json.dumps(report, indent=2))
    else:
        print(render_text(report))


if __name__ == "__main__":
    main()