#!/usr/bin/env python3
"""Compile connectors/index.json + fragment.json + file hash scan → connectors.json

Usage:
    python3 scripts/compile.py                # writes connectors/connectors.json
    python3 scripts/compile.py --verify       # checks existing index is up to date

Reads:
  - connectors/index.json           — ordered list of connector folder ids
  - connectors/<id>/fragment.json   — index entry without files[]
  - physical file scan              — SHA-256 and size of every file in each folder

Produces:
  - connectors/connectors.json      — full index with files[] and SHA-256

Auto-excluded: fragment.json, connector.json, compile.sh, compile.py,
update_hashes.py, .DS_Store, and scripts/ directory.
"""

from __future__ import annotations

import hashlib
import json
import os
import sys

ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
INDEX_DIR = os.path.join(ROOT, "connectors")

EXCLUDE_FILES = {
    "fragment.json",
    "connectors.json",
    "index.json",
    "compile.sh",
    "compile.py",
    "update_hashes.py",
    ".DS_Store",
}

EXCLUDE_DIRS = {"scripts", "__pycache__", ".git"}


def scan_files(folder_path: str) -> list[dict]:
    """Scan all files in folder_path, return [{path, sha256, size}, ...] sorted."""
    files = []
    for fname in sorted(os.listdir(folder_path)):
        fpath = os.path.join(folder_path, fname)
        if os.path.isdir(fpath):
            continue
        if fname in EXCLUDE_FILES:
            continue
        with open(fpath, "rb") as f:
            data = f.read()
        files.append({
            "path": fname,
            "sha256": hashlib.sha256(data).hexdigest(),
            "size": len(data),
        })
    return files


def compile_index() -> list[dict]:
    """Build the connectors list from index.json + fragments + file scan."""
    index_path = os.path.join(INDEX_DIR, "index.json")
    if not os.path.exists(index_path):
        print("❌  connectors/index.json not found. Create it first.", file=sys.stderr)
        sys.exit(1)

    with open(index_path) as f:
        order: list[str] = json.load(f)

    connectors = []
    for i, connector_id in enumerate(order):
        frag_path = os.path.join(INDEX_DIR, connector_id, "fragment.json")
        if not os.path.exists(frag_path):
            print(
                f"⚠️  [{i+1}/{len(order)}] {connector_id} — fragment.json not found, skipping.",
                file=sys.stderr,
            )
            continue

        with open(frag_path) as f:
            fragment: dict = json.load(f)

        folder_path = os.path.join(INDEX_DIR, connector_id)
        files = scan_files(folder_path)
        fragment["files"] = files

        n_files = len(files)
        print(f"✓  [{i+1}/{len(order)}] {connector_id} — {n_files} file{'s' if n_files != 1 else ''}")
        connectors.append(fragment)

    return connectors


def write_index(connectors: list[dict]) -> None:
    """Write the compiled connectors.json."""
    output = {"version": 1, "connectors": connectors}
    out_path = os.path.join(INDEX_DIR, "connectors.json")
    with open(out_path, "w") as f:
        json.dump(output, f, indent=2)
        f.write("\n")
    print(f"\n✅  Written {out_path} ({len(connectors)} connectors)")


def verify_index() -> bool:
    """Verify existing connectors.json matches what compilation would produce."""
    with open(os.path.join(INDEX_DIR, "connectors.json")) as f:
        current = json.load(f)

    fresh = compile_index()

    if current["connectors"] == fresh:
        print("✅  Index is up to date — no changes.")
        return True
    else:
        print("❌  Index is stale. Run compile.py to regenerate.")
        return False


def main() -> None:
    if "--verify" in sys.argv:
        sys.exit(0 if verify_index() else 1)

    connectors = compile_index()
    write_index(connectors)


if __name__ == "__main__":
    main()