#!/usr/bin/env python3
import os, sys, json, subprocess, tempfile, shutil, re, time, random
from datetime import datetime

TOKEN = os.getenv("GITEA_TOKEN", "ffce3b62d583b761238ae00839dce7718acaad85")
API_BASE = os.getenv("GITEA_API_BASE", "http://gitea.bubuit.net:3000/api/v1")
REPO = "oib/aitbc"
AGENT = os.getenv("AGENT_NAME", "aitbc")
OTHER = "aitbc1" if AGENT == "aitbc" else "aitbc"

RING_PREFIXES = [
    (0, ["packages/py/aitbc-core", "packages/py/aitbc-sdk"]),
    (1, ["apps/"]),
    (2, ["cli/", "analytics/", "tools/"]),
]
RING_THRESHOLD = {0: 0.9, 1: 0.8, 2: 0.7, 3: 0.5}

logging.basicConfig(level=logging.INFO, format="%(asctime)s %(levelname)s %(message)s")
logger = logging.getLogger(__name__)

def log(msg):
    logger.info(msg)

def api_get(path):
    cmd = ["curl", "-s", "-H", f"Authorization: token {TOKEN}", f"{API_BASE}/{path}"]
    result = subprocess.run(cmd, capture_output=True, text=True)
    if result.returncode != 0:
        return None
    try:
        return json.loads(result.stdout)
    except:
        return None

def api_post(path, payload):
    cmd = ["curl", "-s", "-X", "POST", "-H", f"Authorization: token {TOKEN}", "-H", "Content-Type: application/json",
           f"{API_BASE}/{path}", "-d", json.dumps(payload)]
    result = subprocess.run(cmd, capture_output=True, text=True)
    if result.returncode != 0:
        return None
    try:
        return json.loads(result.stdout)
    except:
        return None

def get_open_prs():
    return api_get(f"repos/{REPO}/pulls?state=open") or []

def get_my_reviews(pr_number):
    return api_get(f"repos/{REPO}/pulls/{pr_number}/reviews") or []

def is_test_file(path):
    return '/tests/' in path or path.startswith('tests/') or path.endswith('_test.py')

def detect_ring(base_sha, head_sha):
    try:
        output = subprocess.run(
            ["git", "diff", "--name-only", base_sha, head_sha],
            capture_output=True, text=True, check=True, cwd='/opt/aitbc'
        ).stdout
        files = [f.strip() for f in output.splitlines() if f.strip()]
    except subprocess.CalledProcessError:
        files = []
    if files and all(is_test_file(f) for f in files):
        return 3
    for ring, prefixes in sorted(RING_PREFIXES, key=lambda x: x[0]):
        for p in files:
            if any(p.startswith(prefix) for prefix in prefixes):
                return ring
    return 3

def syntax_check(worktree):
    py_files = []
    for root, dirs, files in os.walk(worktree):
        for f in files:
            if f.endswith('.py'):
                py_files.append(os.path.join(root, f))
    for f in py_files:
        r = subprocess.run([sys.executable, '-m', 'py_compile', f], capture_output=True)
        if r.returncode != 0:
            return False, f"Syntax error in {os.path.relpath(f, worktree)}"
    return True, ""

def post_review(pr_number, event, body):
    payload = {"event": event, "body": body}
    return api_post(f"repos/{REPO}/pulls/{pr_number}/reviews", payload) is not None

def request_review(pr_number, reviewer):
    payload = {"reviewers": [reviewer]}
    return api_post(f"repos/{REPO}/pulls/{pr_number}/requested-reviewers", payload) is not None

def main():
    # Jitter 0-60s
    time.sleep(random.randint(0, 60))
    log("Fetching open PRs...")
    prs = get_open_prs()
    if not prs:
        log("No open PRs")
        return
    # Process sibling PRs
    for pr in prs:
        if pr['user']['login'] != OTHER:
            continue
        number = pr['number']
        title = pr['title'][:50]
        log(f"Reviewing sibling PR #{number}: {title}")
        # Checkout and validate
        tmp = tempfile.mkdtemp(prefix="aitbc_monitor_")
        try:
            subprocess.run(["git", "clone", "--no-checkout", "origin", tmp], capture_output=True, check=True)
            wt = os.path.join(tmp, "wt")
            os.makedirs(wt)
            subprocess.run(["git", "--git-dir", os.path.join(tmp, ".git"), "--work-tree", wt, "fetch", "origin", pr['head']['ref']], capture_output=True, check=True)
            subprocess.run(["git", "--git-dir", os.path.join(tmp, ".git"), "--work-tree", wt, "checkout", "FETCH_HEAD"], capture_output=True, check=True)
            ok, err = syntax_check(wt)
            if not ok:
                post_review(number, "REQUEST_CHANGES", f"❌ Syntax error: {err}")
                log(f"PR #{number} failed syntax: {err}")
                continue
            ring = detect_ring(pr['base']['sha'], pr['head']['sha'])
            threshold = RING_THRESHOLD.get(ring, 0.5)
            if ring == 0:
                post_review(number, "REQUEST_CHANGES", f"Ring 0 (core): needs manual review. Threshold: >{threshold}")
                log(f"PR #{number} is Ring0; manual review required")
            else:
                post_review(number, "APPROVE", f"✅ Auto‑approved (ring {ring}, threshold >{threshold})")
                log(f"PR #{number} approved")
        finally:
            shutil.rmtree(tmp, ignore_errors=True)
    # Our own PRs: request review from OTHER if not yet
    our_prs = [pr for pr in prs if pr['user']['login'] == AGENT]
    for pr in our_prs:
        number = pr['number']
        reviews = get_my_reviews(number)
        if not any(r['user']['login'] == OTHER for r in reviews):
            log(f"Requesting review from {OTHER} on our PR #{number}")
            request_review(number, OTHER)

if __name__ == "__main__":
    main()