#!/usr/bin/env python3
"""Build the Hermes Skills Index — a centralized JSON catalog of all skills.

This script crawls every skill source (skills.sh, GitHub taps, official,
clawhub, lobehub, claude-marketplace) and writes a JSON index with resolved
GitHub paths. The index is served as a static file on the docs site so that
`hermes skills search/install` can use it without hitting the GitHub API.

Usage:
    # Local (uses gh CLI or GITHUB_TOKEN for auth)
    python scripts/build_skills_index.py

    # CI (set GITHUB_TOKEN as secret)
    GITHUB_TOKEN=ghp_... python scripts/build_skills_index.py

Output: website/static/api/skills-index.json
"""

import json
import os
import sys
import time
from collections import defaultdict
from concurrent.futures import ThreadPoolExecutor, as_completed
from datetime import datetime, timezone

# Allow importing from repo root
REPO_ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
sys.path.insert(0, REPO_ROOT)

# Ensure HERMES_HOME is set (needed by tools/skills_hub.py imports)
os.environ.setdefault("HERMES_HOME", os.path.join(os.path.expanduser("~"), ".hermes"))

from tools.skills_hub import (
    GitHubAuth,
    GitHubSource,
    SkillsShSource,
    OptionalSkillSource,
    WellKnownSkillSource,
    ClawHubSource,
    ClaudeMarketplaceSource,
    LobeHubSource,
    SkillMeta,
)
import httpx

OUTPUT_PATH = os.path.join(REPO_ROOT, "website", "static", "api", "skills-index.json")
INDEX_VERSION = 1


def _meta_to_dict(meta: SkillMeta) -> dict:
    """Convert a SkillMeta to a serializable dict."""
    return {
        "name": meta.name,
        "description": meta.description,
        "source": meta.source,
        "identifier": meta.identifier,
        "trust_level": meta.trust_level,
        "repo": meta.repo or "",
        "path": meta.path or "",
        "tags": meta.tags or [],
        "extra": meta.extra or {},
    }


def crawl_source(source, source_name: str, limit: int) -> list:
    """Crawl a single source and return skill dicts."""
    print(f"  Crawling {source_name}...", flush=True)
    start = time.time()
    try:
        results = source.search("", limit=limit)
    except Exception as e:
        print(f"  Error crawling {source_name}: {e}", file=sys.stderr)
        return []
    skills = [_meta_to_dict(m) for m in results]
    elapsed = time.time() - start
    print(f"  {source_name}: {len(skills)} skills ({elapsed:.1f}s)", flush=True)
    return skills


def crawl_skills_sh(source: SkillsShSource) -> list:
    """Crawl skills.sh using popular queries for broad coverage."""
    print("  Crawling skills.sh (popular queries)...", flush=True)
    start = time.time()

    queries = [
        "",  # featured
        "react", "python", "web", "api", "database", "docker",
        "testing", "scraping", "design", "typescript", "git",
        "aws", "security", "data", "ml", "ai", "devops",
        "frontend", "backend", "mobile", "cli", "documentation",
        "kubernetes", "terraform", "rust", "go", "java",
    ]

    all_skills: dict[str, dict] = {}
    for query in queries:
        try:
            results = source.search(query, limit=50)
            for meta in results:
                entry = _meta_to_dict(meta)
                if entry["identifier"] not in all_skills:
                    all_skills[entry["identifier"]] = entry
        except Exception as e:
            print(f"    Warning: skills.sh search '{query}' failed: {e}",
                  file=sys.stderr)

    elapsed = time.time() - start
    print(f"  skills.sh: {len(all_skills)} unique skills ({elapsed:.1f}s)",
          flush=True)
    return list(all_skills.values())


def _fetch_repo_tree(repo: str, auth: GitHubAuth) -> list:
    """Fetch the recursive tree for a repo. Returns list of tree entries."""
    headers = auth.get_headers()
    try:
        resp = httpx.get(
            f"https://api.github.com/repos/{repo}",
            headers=headers, timeout=15, follow_redirects=True,
        )
        if resp.status_code != 200:
            return []
        branch = resp.json().get("default_branch", "main")

        resp = httpx.get(
            f"https://api.github.com/repos/{repo}/git/trees/{branch}",
            params={"recursive": "1"},
            headers=headers, timeout=30, follow_redirects=True,
        )
        if resp.status_code != 200:
            return []
        data = resp.json()
        if data.get("truncated"):
            return []
        return data.get("tree", [])
    except Exception:
        return []


def batch_resolve_paths(skills: list, auth: GitHubAuth) -> list:
    """Resolve GitHub paths for skills.sh entries using batch tree lookups.

    Instead of resolving each skill individually (N×M API calls), we:
    1. Group skills by repo
    2. Fetch one tree per repo (2 API calls per repo)
    3. Find all SKILL.md files in the tree
    4. Match skills to their resolved paths
    """
    # Filter to skills.sh entries that need resolution
    skills_sh = [s for s in skills if s["source"] in {"skills.sh", "skills-sh"}]
    if not skills_sh:
        return skills

    print(f"  Resolving paths for {len(skills_sh)} skills.sh entries...",
          flush=True)
    start = time.time()

    # Group by repo
    by_repo: dict[str, list] = defaultdict(list)
    for s in skills_sh:
        repo = s.get("repo", "")
        if repo:
            by_repo[repo].append(s)

    print(f"    {len(by_repo)} unique repos to scan", flush=True)

    resolved_count = 0

    # Fetch trees in parallel (up to 6 concurrent)
    def _resolve_repo(repo: str, entries: list):
        tree = _fetch_repo_tree(repo, auth)
        if not tree:
            return 0

        # Find all SKILL.md paths in this repo
        skill_paths = {}  # skill_dir_name -> full_path
        for item in tree:
            if item.get("type") != "blob":
                continue
            path = item.get("path", "")
            if path.endswith("/SKILL.md"):
                skill_dir = path[: -len("/SKILL.md")]
                dir_name = skill_dir.split("/")[-1]
                skill_paths[dir_name.lower()] = f"{repo}/{skill_dir}"

                # Also check SKILL.md frontmatter name if we can match by path
                # For now, just index by directory name
            elif path == "SKILL.md":
                # Root-level SKILL.md
                skill_paths["_root_"] = f"{repo}"

        count = 0
        for entry in entries:
            # Try to match the skill's name/path to a tree entry
            skill_name = entry.get("name", "").lower()
            skill_path = entry.get("path", "").lower()
            identifier = entry.get("identifier", "")

            # Extract the skill token from the identifier
            # e.g. "skills-sh/d4vinci/scrapling/scrapling-official" -> "scrapling-official"
            parts = identifier.replace("skills-sh/", "").replace("skills.sh/", "")
            skill_token = parts.split("/")[-1].lower() if "/" in parts else ""

            # Try matching in order of likelihood
            for candidate in [skill_token, skill_name, skill_path]:
                if not candidate:
                    continue
                matched = skill_paths.get(candidate)
                if matched:
                    entry["resolved_github_id"] = matched
                    count += 1
                    break
            else:
                # Try fuzzy: skill_token with common transformations
                for tree_name, tree_path in skill_paths.items():
                    if (skill_token and (
                        tree_name.replace("-", "") == skill_token.replace("-", "")
                        or skill_token in tree_name
                        or tree_name in skill_token
                    )):
                        entry["resolved_github_id"] = tree_path
                        count += 1
                        break

        return count

    with ThreadPoolExecutor(max_workers=6) as pool:
        futures = {
            pool.submit(_resolve_repo, repo, entries): repo
            for repo, entries in by_repo.items()
        }
        for future in as_completed(futures):
            try:
                resolved_count += future.result()
            except Exception as e:
                repo = futures[future]
                print(f"    Warning: {repo}: {e}", file=sys.stderr)

    elapsed = time.time() - start
    print(f"  Resolved {resolved_count}/{len(skills_sh)} paths ({elapsed:.1f}s)",
          flush=True)
    return skills


def main():
    print("Building Hermes Skills Index...", flush=True)
    overall_start = time.time()

    auth = GitHubAuth()
    print(f"GitHub auth: {auth.auth_method()}")
    if auth.auth_method() == "anonymous":
        print("WARNING: No GitHub authentication — rate limit is 60/hr. "
              "Set GITHUB_TOKEN for better results.", file=sys.stderr)

    skills_sh_source = SkillsShSource(auth=auth)
    sources = {
        "official": OptionalSkillSource(),
        "well-known": WellKnownSkillSource(),
        "github": GitHubSource(auth=auth),
        "clawhub": ClawHubSource(),
        "claude-marketplace": ClaudeMarketplaceSource(auth=auth),
        "lobehub": LobeHubSource(),
    }

    all_skills: list[dict] = []

    # Crawl skills.sh
    all_skills.extend(crawl_skills_sh(skills_sh_source))

    # Crawl other sources in parallel
    with ThreadPoolExecutor(max_workers=4) as pool:
        futures = {}
        for name, source in sources.items():
            futures[pool.submit(crawl_source, source, name, 500)] = name
        for future in as_completed(futures):
            try:
                all_skills.extend(future.result())
            except Exception as e:
                print(f"  Error: {e}", file=sys.stderr)

    # Batch resolve GitHub paths for skills.sh entries
    all_skills = batch_resolve_paths(all_skills, auth)

    # Deduplicate by identifier
    seen: dict[str, dict] = {}
    for skill in all_skills:
        key = skill["identifier"]
        if key not in seen:
            seen[key] = skill
    deduped = list(seen.values())

    # Sort
    source_order = {"official": 0, "skills-sh": 1, "skills.sh": 1,
                    "github": 2, "well-known": 3, "clawhub": 4,
                    "claude-marketplace": 5, "lobehub": 6}
    deduped.sort(key=lambda s: (source_order.get(s["source"], 99), s["name"]))

    # Build index
    index = {
        "version": INDEX_VERSION,
        "generated_at": datetime.now(timezone.utc).isoformat(),
        "skill_count": len(deduped),
        "skills": deduped,
    }

    os.makedirs(os.path.dirname(OUTPUT_PATH), exist_ok=True)
    with open(OUTPUT_PATH, "w", encoding="utf-8") as f:
        json.dump(index, f, separators=(",", ":"), ensure_ascii=False)

    elapsed = time.time() - overall_start
    file_size = os.path.getsize(OUTPUT_PATH)
    print(f"\nDone! {len(deduped)} skills indexed in {elapsed:.0f}s")
    print(f"Output: {OUTPUT_PATH} ({file_size / 1024:.0f} KB)")

    from collections import Counter
    by_source = Counter(s["source"] for s in deduped)
    for src, count in sorted(by_source.items(), key=lambda x: -x[1]):
        resolved = sum(1 for s in deduped
                       if s["source"] == src and s.get("resolved_github_id"))
        extra = f" ({resolved} resolved)" if resolved else ""
        print(f"  {src}: {count}{extra}")


if __name__ == "__main__":
    main()