"""Helper for dev agent to interact with Gitea issues.

Usage:
    python scripts/agent_poller.py --action list
    python scripts/agent_poller.py --action get --issue 1
    python scripts/agent_poller.py --action comment --issue 1 --body "Working on this"
    python scripts/agent_poller.py --action create-pr --issue 1 --branch fix/issue-1
"""

import argparse
import json
import os
import sys
import urllib.request
import urllib.error

GITEA_URL = os.environ.get("GITEA_URL", "http://localhost:3000")
GITEA_REPO = os.environ.get("GITEA_REPO", "pzhang_zywl/document_analyzer")
GITEA_TOKEN = os.environ.get("GITEA_API_TOKEN", "")

BASE = f"{GITEA_URL}/api/v1/repos/{GITEA_REPO}"
TARGET_LABELS = set()  # List all issues, Dev-Agent handles all non-test issues


def _req(method, path, data=None):
    url = f"{BASE}{path}"
    payload = json.dumps(data).encode("utf-8") if data else None
    req = urllib.request.Request(url, data=payload, method=method)
    req.add_header("Authorization", f"token {GITEA_TOKEN}")
    req.add_header("Content-Type", "application/json")
    try:
        with urllib.request.urlopen(req) as resp:
            return json.loads(resp.read())
    except urllib.error.HTTPError as e:
        body = e.read().decode()
        print(f"API Error {e.code}: {body}", file=sys.stderr)
        sys.exit(1)


def list_issues():
    issues = _req("GET", "/issues?state=open")
    if not issues:
        print("No open issues found.")
        return []
    for i in issues:
        labels = [l["name"] for l in i.get("labels", [])]
        print(f"#{i['number']} [{', '.join(labels) if labels else 'no label'}] {i['title']}")
    return issues


def get_issue(num):
    i = _req("GET", f"/issues/{num}")
    print(f"## #{i['number']}: {i['title']}")
    print(f"State: {i['state']}")
    labels = [l["name"] for l in i.get("labels", [])]
    print(f"Labels: {', '.join(labels) if labels else 'none'}")
    print()
    print(i.get("body", "(no description)"))
    return i


def comment_issue(num, body):
    i = _req("POST", f"/issues/{num}/comments", {"body": body})
    print(f"Comment added to #{num}")
    return i


def create_pr(issue_num, branch):
    # Get issue title for PR description
    issue = _req("GET", f"/issues/{issue_num}")
    title = f"Fix #{issue_num}: {issue['title'].replace('CI Failure: ', '')}"
    body = f"Closes #{issue_num}\n\n{issue.get('body', '')}\n\n🤖 Generated by dev agent"
    pr = _req("POST", "/pulls", {
        "title": title,
        "head": branch,
        "base": "main",
        "body": body,
    })
    print(f"PR created: {pr.get('html_url', pr.get('url', ''))}")
    return pr


def main():
    parser = argparse.ArgumentParser(description="Dev agent Gitea helper")
    parser.add_argument("--action", required=True,
                        choices=["list", "get", "comment", "create-pr"])
    parser.add_argument("--issue", type=int)
    parser.add_argument("--branch")
    parser.add_argument("--body")
    args = parser.parse_args()

    if not GITEA_TOKEN:
        print("Error: GITEA_API_TOKEN environment variable is not set.", file=sys.stderr)
        print("Set it via: export GITEA_API_TOKEN=your-token", file=sys.stderr)
        sys.exit(1)

    if args.action == "list":
        list_issues()
    elif args.action == "get":
        if not args.issue:
            print("--issue is required for 'get' action", file=sys.stderr)
            sys.exit(1)
        get_issue(args.issue)
    elif args.action == "comment":
        if not args.issue or not args.body:
            print("--issue and --body are required for 'comment' action", file=sys.stderr)
            sys.exit(1)
        comment_issue(args.issue, args.body)
    elif args.action == "create-pr":
        if not args.issue or not args.branch:
            print("--issue and --branch are required for 'create-pr' action", file=sys.stderr)
            sys.exit(1)
        create_pr(args.issue, args.branch)


if __name__ == "__main__":
    main()