"""
Git Push via GitLab Commits API (REST).
Umgeht das Git-HTTP-Protokoll komplett.
Nutzt POST /api/v4/projects/:id/repository/commits

Strategie: Vergleiche lokale Dateien mit Remote, pushe nur Aenderungen.
"""
import urllib.request, json, ssl, base64, os
from pathlib import Path

REPO_PATH = Path(__file__).parent.parent  # project-audit/
secrets = {}
with open("project-audit/.secrets", "r", encoding="utf-8-sig") as f:
    for line in f:
        if "=" in line and not line.startswith("#"):
            k, v = line.strip().split("=", 1)
            secrets[k.strip()] = v.strip()

TOKEN = secrets.get("GITLAB_TOKEN_AUDIT", "")
PROJECT = "AndreKnie%2Fproject-audit"
BASE = f"https://git.tech.rz.db.de/api/v4/projects/{PROJECT}"
BRANCH = "master"

ctx = ssl.create_default_context()
ctx.check_hostname = False
ctx.verify_mode = ssl.CERT_NONE


def api_get(path):
    url = BASE + path
    req = urllib.request.Request(url)
    req.add_header("PRIVATE-TOKEN", TOKEN)
    resp = urllib.request.urlopen(req, context=ctx, timeout=30)
    return json.loads(resp.read().decode("utf-8"))


def api_post(path, data):
    url = BASE + path
    body = json.dumps(data).encode("utf-8")
    req = urllib.request.Request(url, data=body, method="POST")
    req.add_header("PRIVATE-TOKEN", TOKEN)
    req.add_header("Content-Type", "application/json")
    resp = urllib.request.urlopen(req, context=ctx, timeout=60)
    return json.loads(resp.read().decode("utf-8"))


def get_remote_tree(path="", ref=BRANCH):
    """Holt den Dateibaum vom Remote rekursiv."""
    files = {}
    page = 1
    while True:
        try:
            items = api_get(f"/repository/tree?ref={ref}&path={path}&per_page=100&page={page}&recursive=true")
            if not items:
                break
            for item in items:
                if item["type"] == "blob":
                    files[item["path"]] = item["id"]  # SHA des Blobs
            page += 1
        except Exception as e:
            print(f"  Tree-Fehler (Seite {page}): {e}")
            break
    return files


def get_local_files():
    """Sammelt alle lokalen Dateien (respektiert .gitignore)."""
    patterns = []
    gitignore = REPO_PATH / ".gitignore"
    if gitignore.exists():
        with open(gitignore) as f:
            patterns = [l.strip().strip("/") for l in f if l.strip() and not l.startswith("#")]

    files = {}
    for root, dirs, fnames in os.walk(REPO_PATH):
        if ".git" in root:
            continue
        for fname in fnames:
            full = Path(root) / fname
            rel = str(full.relative_to(REPO_PATH)).replace("\\", "/")
            if any(p in rel for p in patterns):
                continue
            files[rel] = full
    return files


def main():
    print(f"=== Git Push via API ===")
    print(f"  Token: ...{TOKEN[-4:]}")
    print(f"  Branch: {BRANCH}")
    print()

    # 1. Remote-Tree holen
    print("  Remote-Tree laden...")
    remote_files = get_remote_tree()
    print(f"  Remote: {len(remote_files)} Dateien")

    # 2. Lokale Dateien sammeln
    print("  Lokale Dateien sammeln...")
    local_files = get_local_files()
    print(f"  Lokal: {len(local_files)} Dateien")

    # 3. Diff berechnen
    actions = []
    new_files = set(local_files.keys()) - set(remote_files.keys())
    deleted_files = set(remote_files.keys()) - set(local_files.keys())

    # Neue Dateien
    for f in sorted(new_files):
        path = local_files[f]
        try:
            content = path.read_bytes()
            actions.append({
                "action": "create",
                "file_path": f,
                "content": base64.b64encode(content).decode(),
                "encoding": "base64"
            })
        except Exception:
            pass

    # Geaenderte Dateien (vereinfacht: alle existierenden neu hochladen)
    # Nur wenn es neue/geloeschte gibt, sonst nichts zu tun
    changed = []
    for f in sorted(set(local_files.keys()) & set(remote_files.keys())):
        path = local_files[f]
        try:
            content = path.read_bytes()
            # Einfacher Check: Dateigroesse oder Inhalt hat sich geaendert
            # Wir koennen den SHA nicht lokal berechnen ohne git, also updaten wir alles
            # was in den letzten Tagen geaendert wurde
            mtime = os.path.getmtime(path)
            import time
            if time.time() - mtime < 7 * 86400:  # Letzte 7 Tage
                changed.append(f)
                actions.append({
                    "action": "update",
                    "file_path": f,
                    "content": base64.b64encode(content).decode(),
                    "encoding": "base64"
                })
        except Exception:
            pass

    # Geloeschte Dateien
    for f in sorted(deleted_files):
        actions.append({
            "action": "delete",
            "file_path": f
        })

    print(f"  Neu: {len(new_files)}, Geaendert: {len(changed)}, Geloescht: {len(deleted_files)}")

    if not actions:
        print("  Keine Aenderungen zu pushen.")
        return

    # GitLab API hat ein Limit von ~100 Actions pro Commit
    # Aufteilen in Batches
    BATCH_SIZE = 50
    total_batches = (len(actions) + BATCH_SIZE - 1) // BATCH_SIZE
    print(f"  Push in {total_batches} Batch(es) a {BATCH_SIZE} Dateien...")

    for i in range(0, len(actions), BATCH_SIZE):
        batch = actions[i:i+BATCH_SIZE]
        batch_num = i // BATCH_SIZE + 1
        commit_msg = f"Audit Update (Batch {batch_num}/{total_batches})" if total_batches > 1 else "Audit Update"

        print(f"  Batch {batch_num}: {len(batch)} Aktionen...")
        try:
            result = api_post("/repository/commits", {
                "branch": BRANCH,
                "commit_message": commit_msg,
                "actions": batch
            })
            print(f"    OK: {result.get('short_id', '?')} - {result.get('title', '?')}")
        except urllib.error.HTTPError as e:
            body = e.read().decode("utf-8", errors="replace")
            print(f"    FEHLER {e.code}: {body[:300]}")
            if e.code == 400 and "already exists" in body:
                print("    Tipp: Datei existiert bereits, versuche 'update' statt 'create'")
            break
        except Exception as e:
            print(f"    FEHLER: {e}")
            break

    print()
    print("  Fertig!")


if __name__ == "__main__":
    main()