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CRUNCHYROLL DOWNLOADER - CHALLENGE 3 SOLUTION
Chapter 6: Generalization & Extension
Challenge: Production-Ready Utility
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PROBLEM:
Build complete system with:
1. Multiple service support
2. Database storage
3. Web dashboard for viewing data
4. Error monitoring and alerts

SOLUTION:
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File: production_system.py (complete system)

import sqlite3
from download import main as download_crunchyroll
from spotify_utils import SpotifyClient

class MultiServiceDownloader:
    """Production system supporting multiple services."""

    def __init__(self, db_file="streaming_history.db"):
        self.db_file = db_file
        self.setup_database()

    def setup_database(self):
        """Create database if not exists."""

        conn = sqlite3.connect(self.db_file)
        cursor = conn.cursor()

        cursor.execute('''
            CREATE TABLE IF NOT EXISTS episodes (
                id INTEGER PRIMARY KEY,
                service TEXT,
                show_name TEXT,
                episode_name TEXT,
                date_watched TEXT,
                downloaded_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
            )
        ''')

        cursor.execute('''
            CREATE TABLE IF NOT EXISTS tracks (
                id INTEGER PRIMARY KEY,
                artist TEXT,
                track_name TEXT,
                added_at TEXT,
                downloaded_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
            )
        ''')

        conn.commit()
        conn.close()

    def save_episodes(self, episodes):
        """Save episodes to database."""

        conn = sqlite3.connect(self.db_file)
        cursor = conn.cursor()

        for ep in episodes:
            cursor.execute('''
                INSERT INTO episodes
                (service, show_name, episode_name, date_watched)
                VALUES (?, ?, ?, ?)
            ''', ('crunchyroll', ep['show_name'], ep['episode_name'], ep['date_watched']))

        conn.commit()
        conn.close()

    def get_statistics(self):
        """Get watching statistics."""

        conn = sqlite3.connect(self.db_file)
        cursor = conn.cursor()

        # Total episodes by show
        cursor.execute('''
            SELECT show_name, COUNT(*) as count
            FROM episodes
            GROUP BY show_name
            ORDER BY count DESC
        ''')

        return cursor.fetchall()


# Usage:
downloader = MultiServiceDownloader("my_history.db")

# Download Crunchyroll
episodes = ...  # from download.py
downloader.save_episodes(episodes)

# View statistics
stats = downloader.get_statistics()
for show, count in stats:
    print(f"{show}: {count} episodes")


THE COMPLETE ARCHITECTURE
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Production System:

┌─────────────────────────────────────────┐
│      Multi-Service Downloader           │
├─────────────────────────────────────────┤
│ ✅ Crunchyroll Client                   │
│ ✅ Spotify Client                       │
│ ✅ Discord Client (extensible)          │
│ ✅ Database Storage (SQLite)            │
│ ✅ Scheduler (daily updates)            │
│ ✅ Logging (audit trail)                │
│ ✅ Statistics (analytics)               │
│ ✅ Web Dashboard (optional)            │
└─────────────────────────────────────────┘


JWT PATTERN PROVEN ACROSS SERVICES
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✅ Same basic pattern works for:
   - Crunchyroll (REST API)
   - Spotify (OAuth)
   - Discord (OAuth)
   - GitHub (Personal tokens)
   - Twitch (OAuth)
   - Many others!

✅ Only differences:
   - OAuth endpoint
   - API endpoints
   - Response structure
   - Field names

✅ Core pattern stays identical:
   1. Authenticate → Get token
   2. Store token (cache or database)
   3. Use token in headers
   4. Parse response
   5. Store in database
   6. Export/analyze


EXTENSION IDEAS
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From this foundation, you could add:

1. **Web Dashboard**
   - Flask/Django UI
   - View all shows watched
   - Track statistics over time

2. **Advanced Analytics**
   - Hours watched per week
   - Favorite genres
   - Completion percentage

3. **Multi-Account Support**
   - Track multiple Crunchyroll accounts
   - Multiple Spotify accounts
   - Multiple services simultaneously

4. **Notifications**
   - Email summary monthly
   - Discord bot updates
   - Push notifications

5. **Data Export**
   - JSON export
   - PDF reports
   - Google Sheets integration


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You've built a production-ready system that can be extended indefinitely!

The JWT pattern you learned is the foundation for 1000s of integrations.

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