#!/usr/bin/env python3
"""Backfill reviewer_count in contributors table from prs review data.

Sources of review data:
1. leo_verdict in prs table (approve/request_changes = Leo reviewed)
2. domain_verdict + domain_agent in prs table (domain agent reviewed)
3. Forgejo API reviews (agents that submitted reviews via Forgejo)

Deduplication: If the same agent is both leo_verdict reviewer and domain_agent
on the same PR, count it once per PR.
"""
import sqlite3
import json
import os
import sys
import urllib.request

DB_PATH = os.environ.get("PIPELINE_DB", "/opt/teleo-eval/pipeline/pipeline.db")
FORGEJO_URL = "http://localhost:3000/api/v1"
REPO = "teleo/teleo-codex"

def get_forgejo_token():
    token_path = "/opt/teleo-eval/secrets/forgejo-admin-token"
    if os.path.exists(token_path):
        return open(token_path).read().strip()
    return os.environ.get("FORGEJO_TOKEN", "")

def fetch_forgejo_reviews(pr_number, token):
    """Fetch reviews from Forgejo API for a single PR."""
    url = f"{FORGEJO_URL}/repos/{REPO}/pulls/{pr_number}/reviews"
    req = urllib.request.Request(url, headers={"Authorization": f"token {token}"})
    try:
        with urllib.request.urlopen(req, timeout=5) as resp:
            return json.loads(resp.read())
    except Exception:
        return []

def main():
    dry_run = "--dry-run" in sys.argv
    skip_forgejo = "--skip-forgejo" in sys.argv

    conn = sqlite3.connect(DB_PATH)
    conn.row_factory = sqlite3.Row

    # Step 1: Collect review events from prs table
    # reviewer -> set of PR numbers they reviewed
    reviewer_prs = {}

    # Leo reviews (leo_verdict = approve or request_changes)
    rows = conn.execute("""
        SELECT number FROM prs
        WHERE status='merged' AND leo_verdict IN ('approve', 'request_changes')
    """).fetchall()
    leo_prs = {r["number"] for r in rows}
    if leo_prs:
        reviewer_prs["leo"] = leo_prs
    print(f"Leo reviews from leo_verdict: {len(leo_prs)}")

    # Domain agent reviews
    rows = conn.execute("""
        SELECT number, domain_agent FROM prs
        WHERE status='merged' AND domain_verdict IN ('approve', 'request_changes')
        AND domain_agent IS NOT NULL AND domain_agent != ''
    """).fetchall()
    for r in rows:
        agent = r["domain_agent"].lower()
        if agent not in reviewer_prs:
            reviewer_prs[agent] = set()
        reviewer_prs[agent].add(r["number"])

    # Print domain agent counts (before dedup with Leo)
    for agent in sorted(reviewer_prs):
        if agent != "leo":
            print(f"  {agent} domain reviews: {len(reviewer_prs[agent])}")

    # Leo as domain_agent overlaps with leo_verdict — already deduped by using sets
    leo_domain = conn.execute("""
        SELECT COUNT(*) as cnt FROM prs
        WHERE status='merged' AND domain_agent='Leo'
        AND domain_verdict IN ('approve', 'request_changes')
    """).fetchone()["cnt"]
    print(f"  Leo as domain_agent: {leo_domain} (deduplicated into Leo's total)")

    # Step 2: Optionally fetch Forgejo API reviews
    if not skip_forgejo:
        token = get_forgejo_token()
        if token:
            # Get all merged PR numbers
            merged = conn.execute(
                "SELECT number FROM prs WHERE status='merged'"
            ).fetchall()
            merged_numbers = [r["number"] for r in merged]

            print(f"\nFetching Forgejo reviews for {len(merged_numbers)} merged PRs...")
            forgejo_count = 0
            for i, pr_num in enumerate(merged_numbers):
                if i % 100 == 0 and i > 0:
                    print(f"  ...{i}/{len(merged_numbers)}")
                reviews = fetch_forgejo_reviews(pr_num, token)
                for review in reviews:
                    if review.get("state") in ("APPROVED", "REQUEST_CHANGES"):
                        login = review["user"]["login"].lower()
                        if login not in reviewer_prs:
                            reviewer_prs[login] = set()
                        reviewer_prs[login].add(pr_num)
                        forgejo_count += 1
            print(f"  Forgejo API reviews found: {forgejo_count}")
        else:
            print("\nNo Forgejo token found, skipping API reviews")
    else:
        print("\nSkipping Forgejo API reviews (--skip-forgejo)")

    # Step 3: Compute final counts
    print("\n--- Final reviewer counts ---")
    existing = {r["handle"]: r["reviewer_count"] for r in
                conn.execute("SELECT handle, reviewer_count FROM contributors").fetchall()}

    updates = {}
    for reviewer, prs in sorted(reviewer_prs.items()):
        count = len(prs)
        current = existing.get(reviewer, None)
        if current is not None:
            updates[reviewer] = count
            print(f"  {reviewer}: {current} -> {count} ({count - current:+d})")
        else:
            print(f"  {reviewer}: {count} reviews (no contributor record, skipping)")

    # Step 4: Apply updates
    if dry_run:
        print(f"\n[DRY RUN] Would update {len(updates)} contributors")
    else:
        for handle, count in updates.items():
            conn.execute(
                "UPDATE contributors SET reviewer_count = ?, updated_at = datetime('now') WHERE handle = ?",
                (count, handle)
            )
        conn.commit()
        print(f"\nUpdated {len(updates)} contributors")

    conn.close()

if __name__ == "__main__":
    main()