#!/usr/bin/env python3
"""
Data Collection Script
Collects posts and comments from multiple platforms with UUID-based storage.
Functional approach - no classes, just functions.
"""

import json
import uuid
from datetime import datetime, timedelta
from pathlib import Path
from typing import List, Dict, Tuple
from data_collection_lib import data_methods


# ===== STORAGE FUNCTIONS =====

def ensure_directories(storage_dir: str) -> Dict[str, Path]:
    """Create and return directory paths"""
    base = Path(storage_dir)

    dirs = {
        'posts': base / 'posts',
        'comments': base / 'comments',
        'moderation': base / 'moderation',
        'base': base
    }

    for path in dirs.values():
        path.mkdir(parents=True, exist_ok=True)

    return dirs


def load_index(storage_dir: str) -> Dict:
    """Load post index from disk"""
    index_file = Path(storage_dir) / 'post_index.json'

    if index_file.exists():
        with open(index_file, 'r') as f:
            index = json.load(f)
        print(f"Loaded index with {len(index)} posts")
        return index

    return {}


def save_index(index: Dict, storage_dir: str):
    """Save post index to disk"""
    index_file = Path(storage_dir) / 'post_index.json'
    with open(index_file, 'w') as f:
        json.dump(index, f, indent=2)


def load_state(storage_dir: str) -> Dict:
    """Load collection state from disk"""
    state_file = Path(storage_dir) / 'collection_state.json'

    if state_file.exists():
        with open(state_file, 'r') as f:
            state = json.load(f)
        print(f"Loaded collection state: {state.get('last_run', 'never')}")
        return state

    return {}


def save_state(state: Dict, storage_dir: str):
    """Save collection state to disk"""
    state_file = Path(storage_dir) / 'collection_state.json'
    with open(state_file, 'w') as f:
        json.dump(state, f, indent=2)


def generate_uuid() -> str:
    """Generate a new UUID"""
    return str(uuid.uuid4())


# ===== MODERATION FUNCTIONS =====

def create_moderation_stub(target_id: str, target_type: str, dirs: Dict) -> str:
    """Create moderation stub file and return UUID"""
    mod_uuid = generate_uuid()

    moderation_data = {
        "target_id": target_id,
        "target_type": target_type,
        "analyzed_at": int(datetime.now().timestamp()),
        "model_version": "stub-1.0",
        "flags": {
            "requires_review": False,
            "is_blocked": False,
            "is_flagged": False,
            "is_safe": True
        }
    }

    mod_file = dirs['moderation'] / f"{mod_uuid}.json"
    with open(mod_file, 'w') as f:
        json.dump(moderation_data, f, indent=2)

    return mod_uuid


# ===== POST FUNCTIONS =====

def save_post(post: Dict, platform: str, index: Dict, dirs: Dict) -> str:
    """Save post to UUID-based file, return UUID"""
    post_id = f"{platform}_{post['id']}"

    # Check if already exists
    if post_id in index:
        return index[post_id]

    # Generate UUID and save
    post_uuid = generate_uuid()
    post['uuid'] = post_uuid
    post['moderation_uuid'] = create_moderation_stub(post_id, 'post', dirs)

    post_file = dirs['posts'] / f"{post_uuid}.json"
    with open(post_file, 'w') as f:
        json.dump(post, f, indent=2)

    # Update index
    index[post_id] = post_uuid

    return post_uuid


# ===== COMMENT FUNCTIONS =====

def save_comment(comment: Dict, post_uuid: str, platform: str, dirs: Dict) -> str:
    """Save comment to UUID-based file, return UUID"""
    comment_uuid = generate_uuid()

    comment['uuid'] = comment_uuid
    comment['post_uuid'] = post_uuid
    comment['platform'] = platform
    comment['moderation_uuid'] = create_moderation_stub(
        f"{platform}_comment_{comment['id']}",
        'comment',
        dirs
    )

    comment_file = dirs['comments'] / f"{comment_uuid}.json"
    with open(comment_file, 'w') as f:
        json.dump(comment, f, indent=2)

    return comment_uuid


def fetch_and_save_comments(post: Dict, platform: str, dirs: Dict, max_comments: int = 50) -> List[str]:
    """Fetch comments for post and save them, return list of UUIDs"""
    comments = []
    post_id = post.get('id')

    # Fetch comments based on platform
    if platform == 'reddit':
        source = post.get('source', '').replace('r/', '')
        comments = data_methods.comment_fetchers.fetch_reddit_comments(post_id, source, max_comments)
    elif platform == 'hackernews':
        if post_id.startswith('hn_'):
            story_id = post_id[3:]
            comments = data_methods.comment_fetchers.fetch_hackernews_comments(story_id, max_comments)

    # Save comments with parent UUID mapping
    comment_uuid_map = {}
    comment_uuids = []
    post_uuid = post.get('uuid')

    for comment in comments:
        # Map parent ID to UUID
        parent_id = comment.get('parent_comment_id')
        if parent_id and parent_id in comment_uuid_map:
            comment['parent_comment_uuid'] = comment_uuid_map[parent_id]
        else:
            comment['parent_comment_uuid'] = None

        # Save comment
        comment_uuid = save_comment(comment, post_uuid, platform, dirs)
        comment_uuid_map[comment['id']] = comment_uuid
        comment_uuids.append(comment_uuid)

    return comment_uuids


# ===== COLLECTION FUNCTIONS =====

def collect_platform(platform: str, community: str, start_date: str, end_date: str,
                    max_posts: int, fetch_comments: bool, index: Dict, dirs: Dict) -> int:
    """Collect posts and comments from a platform, return count of new posts"""
    print(f"\nCollecting from {platform}" + (f"/{community}" if community else ""))

    try:
        # Fetch posts
        new_posts = data_methods.getData(platform, start_date, end_date, community, max_posts)

        if not new_posts:
            print(f"  No posts retrieved")
            return 0

        print(f"  Retrieved {len(new_posts)} posts")

        # Process each post
        added_count = 0
        for post in new_posts:
            post_id = f"{platform}_{post['id']}"

            # Skip if already collected
            if post_id in index:
                continue

            # Save post
            post_uuid = save_post(post, platform, index, dirs)
            added_count += 1

            # Fetch and save comments
            if fetch_comments:
                comment_uuids = fetch_and_save_comments(post, platform, dirs)
                if comment_uuids:
                    print(f"    Post {post['id']}: saved {len(comment_uuids)} comments")

        if added_count > 0:
            print(f"  Added {added_count} new posts")

        return added_count

    except Exception as e:
        print(f"  Error: {e}")
        import traceback
        traceback.print_exc()
        return 0


def calculate_date_range(days_back: int, state: Dict) -> Tuple[str, str]:
    """Calculate start and end dates for collection, considering resume"""
    end_date = datetime.now()
    start_date = end_date - timedelta(days=days_back)

    # Resume from last run if recent
    if state.get('last_run'):
        last_run = datetime.fromisoformat(state['last_run'])
        if (end_date - last_run).total_seconds() < 3600:  # Less than 1 hour ago
            print(f"Last run was {last_run.isoformat()}, resuming from that point")
            start_date = last_run

    return start_date.isoformat(), end_date.isoformat()


def collect_batch(sources: List[Dict], storage_dir: str, days_back: int = 1, fetch_comments: bool = True):
    """Main collection function - orchestrates everything"""

    # Setup
    dirs = ensure_directories(storage_dir)
    index = load_index(storage_dir)
    state = load_state(storage_dir)

    # Calculate date range
    start_iso, end_iso = calculate_date_range(days_back, state)

    print(f"\n{'='*60}")
    print(f"Collection Period: {start_iso} to {end_iso}")
    print(f"Fetch comments: {fetch_comments}")
    print(f"{'='*60}")

    # Collect from each source
    total_new = 0
    for source in sources:
        platform = source['platform']
        community = source.get('community', '')
        max_posts = source.get('max_posts', 100)

        count = collect_platform(
            platform, community, start_iso, end_iso,
            max_posts, fetch_comments, index, dirs
        )
        total_new += count

    # Update and save state
    state['last_run'] = end_iso
    state['total_posts'] = len(index)
    state['last_batch_count'] = total_new

    save_index(index, storage_dir)
    save_state(state, storage_dir)

    print(f"\n{'='*60}")
    print(f"Collection Complete")
    print(f"  New posts this run: {total_new}")
    print(f"  Total posts in stash: {len(index)}")
    print(f"{'='*60}\n")


def get_stats(storage_dir: str) -> Dict:
    """Get collection statistics"""
    dirs = ensure_directories(storage_dir)
    index = load_index(storage_dir)
    state = load_state(storage_dir)

    post_count = len(list(dirs['posts'].glob('*.json')))
    comment_count = len(list(dirs['comments'].glob('*.json')))
    moderation_count = len(list(dirs['moderation'].glob('*.json')))

    return {
        'total_posts': post_count,
        'total_comments': comment_count,
        'total_moderation_records': moderation_count,
        'index_entries': len(index),
        'last_run': state.get('last_run', 'never'),
        'storage_dir': storage_dir
    }


def print_stats(storage_dir: str):
    """Print collection statistics"""
    stats = get_stats(storage_dir)

    print(f"\n{'='*60}")
    print(f"Collection Statistics")
    print(f"{'='*60}")
    print(f"Total posts: {stats['total_posts']}")
    print(f"Total comments: {stats['total_comments']}")
    print(f"Total moderation records: {stats['total_moderation_records']}")
    print(f"Index entries: {stats['index_entries']}")
    print(f"Last run: {stats['last_run']}")
    print(f"Storage: {stats['storage_dir']}")
    print(f"{'='*60}\n")


# ===== MAIN ENTRY POINT =====

def load_platform_config(config_file: str = "./platform_config.json") -> Dict:
    """Load platform configuration from JSON file"""
    try:
        with open(config_file, 'r') as f:
            return json.load(f)
    except Exception as e:
        print(f"Error loading platform config: {e}")
        # Return minimal fallback config
        return {
            "collection_targets": [
                {'platform': 'reddit', 'community': 'python', 'max_posts': 50, 'priority': 'high'},
                {'platform': 'reddit', 'community': 'programming', 'max_posts': 50, 'priority': 'high'},
                {'platform': 'hackernews', 'community': 'front_page', 'max_posts': 50, 'priority': 'high'},
            ]
        }


def get_collection_sources(config: Dict, priority_filter: str = None) -> List[Dict]:
    """Extract collection sources from platform config, optionally filtered by priority"""
    sources = []
    
    for target in config.get('collection_targets', []):
        # Apply priority filter if specified
        if priority_filter and target.get('priority') != priority_filter:
            continue
            
        sources.append({
            'platform': target['platform'],
            'community': target['community'],
            'max_posts': target['max_posts']
        })
    
    return sources


def main():
    """Main entry point"""
    storage_dir = "./data"

    # Load platform configuration
    platform_config = load_platform_config()
    
    # Get collection sources (all priorities for comprehensive collection)
    sources = get_collection_sources(platform_config)
    
    print(f"Loaded {len(sources)} collection targets from platform configuration")
    for source in sources:
        print(f"  - {source['platform']}/{source['community']}: {source['max_posts']} posts")

    # Collect posts and comments
    collect_batch(sources, storage_dir, days_back=1, fetch_comments=True)

    # Print statistics
    print_stats(storage_dir)


if __name__ == "__main__":
    main()