"""
scoutd/lemmy.py - lemmy (fediverse reddit) discovery

lemmy is federated so we hit multiple instances.
great for finding lost builders in communities like:
- /c/programming, /c/technology, /c/linux
- /c/antiwork, /c/workreform (lost builders!)
- /c/selfhosted, /c/privacy, /c/opensource

supports authenticated access for private instances and DM delivery.
"""

import requests
import json
import time
import os
from datetime import datetime
from pathlib import Path

from .signals import analyze_text
from .lost import (
    analyze_social_for_lost_signals,
    analyze_text_for_lost_signals,
    classify_user,
)

# auth config from environment
LEMMY_INSTANCE = os.environ.get('LEMMY_INSTANCE', '')
LEMMY_USERNAME = os.environ.get('LEMMY_USERNAME', '')
LEMMY_PASSWORD = os.environ.get('LEMMY_PASSWORD', '')

# auth token cache
_auth_token = None

# popular lemmy instances
LEMMY_INSTANCES = [
    'lemmy.ml',
    'lemmy.world',
    'programming.dev',
    'lemm.ee',
    'sh.itjust.works',
]

# communities to scout (format: community@instance or just community for local)
TARGET_COMMUNITIES = [
    # builder communities
    'programming',
    'selfhosted',
    'linux',
    'opensource',
    'privacy',
    'technology',
    'webdev',
    'rust',
    'python',
    'golang',

    # lost builder communities (people struggling, stuck, seeking)
    'antiwork',
    'workreform',
    'careerguidance',
    'cscareerquestions',
    'learnprogramming',
    'findapath',
]

CACHE_DIR = Path(__file__).parent.parent / 'db' / 'cache' / 'lemmy'
CACHE_DIR.mkdir(parents=True, exist_ok=True)


def get_auth_token(instance=None):
    """get auth token for lemmy instance"""
    global _auth_token

    if _auth_token:
        return _auth_token

    instance = instance or LEMMY_INSTANCE
    if not all([instance, LEMMY_USERNAME, LEMMY_PASSWORD]):
        return None

    try:
        url = f"https://{instance}/api/v3/user/login"
        resp = requests.post(url, json={
            'username_or_email': LEMMY_USERNAME,
            'password': LEMMY_PASSWORD,
        }, timeout=30)

        if resp.status_code == 200:
            _auth_token = resp.json().get('jwt')
            return _auth_token
        return None
    except Exception as e:
        print(f"lemmy auth error: {e}")
        return None


def send_lemmy_dm(recipient_username, message, dry_run=False):
    """send a private message via lemmy"""
    if not LEMMY_INSTANCE:
        return False, "LEMMY_INSTANCE not configured"

    if dry_run:
        print(f"[dry run] would send lemmy DM to {recipient_username}")
        return True, None

    token = get_auth_token()
    if not token:
        return False, "failed to authenticate with lemmy"

    try:
        # parse recipient - could be username@instance or just username
        if '@' in recipient_username:
            username, instance = recipient_username.split('@', 1)
        else:
            username = recipient_username
            instance = LEMMY_INSTANCE

        # get recipient user id
        user_url = f"https://{LEMMY_INSTANCE}/api/v3/user"
        resp = requests.get(user_url, params={'username': f"{username}@{instance}"}, timeout=30)

        if resp.status_code != 200:
            # try without instance suffix for local users
            resp = requests.get(user_url, params={'username': username}, timeout=30)

        if resp.status_code != 200:
            return False, f"could not find user {recipient_username}"

        recipient_id = resp.json().get('person_view', {}).get('person', {}).get('id')
        if not recipient_id:
            return False, "could not get recipient id"

        # send DM
        dm_url = f"https://{LEMMY_INSTANCE}/api/v3/private_message"
        resp = requests.post(dm_url,
            headers={'Authorization': f'Bearer {token}'},
            json={
                'content': message,
                'recipient_id': recipient_id,
            },
            timeout=30
        )

        if resp.status_code == 200:
            return True, None
        else:
            return False, f"lemmy DM error: {resp.status_code} - {resp.text}"

    except Exception as e:
        return False, f"lemmy DM error: {str(e)}"


def get_community_posts(instance, community, limit=50, sort='New'):
    """get posts from a lemmy community"""
    try:
        url = f"https://{instance}/api/v3/post/list"
        params = {
            'community_name': community,
            'sort': sort,
            'limit': limit,
        }

        resp = requests.get(url, params=params, timeout=30)
        if resp.status_code == 200:
            return resp.json().get('posts', [])
        return []
    except Exception as e:
        return []


def get_user_profile(instance, username):
    """get lemmy user profile"""
    try:
        url = f"https://{instance}/api/v3/user"
        params = {'username': username}

        resp = requests.get(url, params=params, timeout=30)
        if resp.status_code == 200:
            return resp.json()
        return None
    except Exception:
        return None


def analyze_lemmy_user(instance, username, posts=None):
    """analyze a lemmy user for values alignment and lost signals"""
    profile = get_user_profile(instance, username)
    if not profile:
        return None

    person = profile.get('person_view', {}).get('person', {})
    counts = profile.get('person_view', {}).get('counts', {})

    bio = person.get('bio', '') or ''
    display_name = person.get('display_name') or person.get('name', username)

    # analyze bio
    bio_score, bio_signals, bio_reasons = analyze_text(bio)

    # analyze posts if provided
    post_signals = []
    post_text = []
    if posts:
        for post in posts[:10]:
            post_data = post.get('post', {})
            title = post_data.get('name', '')
            body = post_data.get('body', '')
            post_text.append(f"{title} {body}")

            _, signals, _ = analyze_text(f"{title} {body}")
            post_signals.extend(signals)

    all_signals = list(set(bio_signals + post_signals))
    total_score = bio_score + len(post_signals) * 5

    # lost builder detection
    profile_for_lost = {
        'bio': bio,
        'post_count': counts.get('post_count', 0),
        'comment_count': counts.get('comment_count', 0),
    }
    posts_for_lost = [{'text': t} for t in post_text]

    lost_signals, lost_weight = analyze_social_for_lost_signals(profile_for_lost, posts_for_lost)
    lost_potential_score = lost_weight
    user_type = classify_user(lost_potential_score, 50, total_score)

    return {
        'platform': 'lemmy',
        'username': f"{username}@{instance}",
        'url': f"https://{instance}/u/{username}",
        'name': display_name,
        'bio': bio,
        'location': None,
        'score': total_score,
        'confidence': min(0.9, 0.3 + len(all_signals) * 0.1),
        'signals': all_signals,
        'negative_signals': [],
        'reasons': bio_reasons,
        'contact': {},
        'extra': {
            'instance': instance,
            'post_count': counts.get('post_count', 0),
            'comment_count': counts.get('comment_count', 0),
        },
        'lost_potential_score': lost_potential_score,
        'lost_signals': lost_signals,
        'user_type': user_type,
    }


def scrape_lemmy(db, limit_per_community=30):
    """scrape lemmy instances for aligned builders"""
    print("scouting lemmy...")

    found = 0
    lost_found = 0
    seen_users = set()

    # build instance list - user's instance first if configured
    instances = list(LEMMY_INSTANCES)
    if LEMMY_INSTANCE and LEMMY_INSTANCE not in instances:
        instances.insert(0, LEMMY_INSTANCE)

    for instance in instances:
        print(f"  instance: {instance}")

        for community in TARGET_COMMUNITIES:
            posts = get_community_posts(instance, community, limit=limit_per_community)

            if not posts:
                continue

            print(f"    /c/{community}: {len(posts)} posts")

            # group posts by user
            user_posts = {}
            for post in posts:
                creator = post.get('creator', {})
                username = creator.get('name')
                if not username:
                    continue

                user_key = f"{username}@{instance}"
                if user_key in seen_users:
                    continue

                if user_key not in user_posts:
                    user_posts[user_key] = []
                user_posts[user_key].append(post)

            # analyze each user
            for user_key, posts in user_posts.items():
                username = user_key.split('@')[0]

                if user_key in seen_users:
                    continue
                seen_users.add(user_key)

                result = analyze_lemmy_user(instance, username, posts)
                if not result:
                    continue

                if result['score'] >= 20 or result.get('lost_potential_score', 0) >= 30:
                    db.save_human(result)
                    found += 1

                    if result.get('user_type') in ['lost', 'both']:
                        lost_found += 1
                        print(f"      {result['username']}: {result['score']:.0f} (lost: {result['lost_potential_score']:.0f})")
                    elif result['score'] >= 40:
                        print(f"      {result['username']}: {result['score']:.0f}")

                time.sleep(0.5)  # rate limit

            time.sleep(1)  # between communities

        time.sleep(2)  # between instances

    print(f"lemmy: found {found} humans ({lost_found} lost builders)")
    return found