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

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

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")

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

def die(msg):
    log(f"FATAL: {msg}")
    sys.exit(1)

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 compute_utility(issue):
    score = 0
    labels = [l['name'] for l in issue['labels']]
    if 'security' in labels:
        score += 100
    elif 'bug' in labels:
        score += 50
    elif 'feature' in labels:
        score += 30
    elif 'refactor' in labels:
        score += 10
    if 'good-first-task-for-agent' in labels:
        score += 20
    if any(tag in labels for tag in ['needs-design', 'blocked', 'needs-reproduction']):
        score -= 1000
    score += issue['comments'] * 5
    return score

def get_open_unassigned_issues():
    items = api_get(f"repos/{REPO}/issues?state=open") or []
    candidates = []
    for i in items:
        # Skip PRs: pull_request field is non-null for PRs
        if i.get('pull_request') is not None:
            continue
        if i['assignee'] is not None:
            continue
        labels = [l['name'] for l in i['labels']]
        if any(tag in labels for tag in ['needs-design', 'blocked', 'needs-reproduction']):
            continue
        candidates.append(i)
    return candidates

def create_claim_branch(issue_number):
    branch = f"claim/{issue_number}"
    subprocess.run(["git", "fetch", "origin"], capture_output=True, cwd=REPO_DIR)
    subprocess.run(["git", "checkout", "-B", branch, "origin/main"], capture_output=True, cwd=REPO_DIR)
    subprocess.run(["git", "commit", "--allow-empty", "-m", f"Claim issue #{issue_number} for {AGENT}"], capture_output=True, cwd=REPO_DIR)
    r = subprocess.run(["git", "push", "-u", "origin", branch], capture_output=True, cwd=REPO_DIR)
    return r.returncode == 0

def assign_issue(issue_number):
    payload = {"assignee": AGENT}
    result = api_post(f"repos/{REPO}/issues/{issue_number}/assignees", payload)
    return result is not None

def add_comment(issue_number, body):
    payload = {"body": body}
    return api_post(f"repos/{REPO}/issues/{issue_number}/comments", payload) is not None

def main():
    # Jitter 0-60s
    time.sleep(random.randint(0, 60))
    log("Claim task cycle starting...")
    state_file = os.path.join(REPO_DIR, ".claim-state.json")
    try:
        with open(state_file) as f:
            state = json.load(f)
    except:
        state = {}
    if state.get('current_claim'):
        log(f"Already working on issue #{state['current_claim']} (branch {state.get('work_branch')})")
        return
    issues = get_open_unassigned_issues()
    if not issues:
        log("No unassigned issues available.")
        return
    issues.sort(key=lambda i: compute_utility(i), reverse=True)
    for issue in issues:
        num = issue['number']
        title = issue['title']
        labels = [lbl['name'] for lbl in issue.get('labels', [])]
        log(f"Attempting to claim issue #{num}: {title} (labels={labels})")
        if create_claim_branch(num):
            assign_issue(num)
            slug = ''.join(c if c.isalnum() else '-' for c in title.lower())[:40].strip('-')
            work_branch = f"{AGENT}/{num}-{slug}"
            subprocess.run(["git", "checkout", "-b", work_branch, "main"], cwd=REPO_DIR, capture_output=True)
            state = {
                'current_claim': num,
                'claim_branch': f'claim/{num}',
                'work_branch': work_branch,
                'claimed_at': datetime.utcnow().isoformat() + 'Z',
                'issue_title': title,
                'labels': labels
            }
            with open(state_file, 'w') as f:
                json.dump(state, f, indent=2)
            add_comment(num, f"Agent `{AGENT}` claiming this task. (automated)")
            log(f"✅ Claimed issue #{num}. Work branch: {work_branch}")
            return
        else:
            log(f"Claim failed for #{num} (branch exists). Trying next...")
    log("Could not claim any issue; all taken or unavailable.")

if __name__ == "__main__":
    REPO_DIR = '/opt/aitbc'
    main()