"""Supabase Storage-based storage for analytics data"""
import json
import os
from datetime import datetime
from typing import Dict, Any, Optional, List
import uuid

class StorageBucketDB:
    """Uses Supabase Storage bucket to store analytics JSON files"""
    
    BUCKET_NAME = 'analytics-data'
    
    def __init__(self, supabase_client):
        self.supabase = supabase_client
        self.storage = supabase_client.storage
        print(f"[StorageBucketDB] Initialized with bucket: {self.BUCKET_NAME}")
        
        # In-memory cache for faster reads
        self._cache = {}
    
    def _get_path(self, table_name: str) -> str:
        """Get storage path for a table"""
        return f"{table_name}.json"
    
    def _load_table(self, table_name: str) -> Dict:
        """Load table data from storage"""
        if table_name in self._cache:
            return self._cache[table_name]
        
        try:
            path = self._get_path(table_name)
            response = self.storage.from_(self.BUCKET_NAME).download(path)
            if response:
                data = json.loads(response.decode('utf-8'))
                self._cache[table_name] = data
                print(f"[StorageBucketDB] Loaded {table_name}: {len(data)} records")
                return data
        except Exception as e:
            print(f"[StorageBucketDB] Table {table_name} not found or empty: {e}")
        
        self._cache[table_name] = {}
        return {}
    
    def _save_table(self, table_name: str, data: Dict):
        """Save table data to storage"""
        try:
            path = self._get_path(table_name)
            content = json.dumps(data, indent=2, default=str).encode('utf-8')
            
            # Try to update first, then upload if not exists
            try:
                self.storage.from_(self.BUCKET_NAME).update(path, content, {
                    'content-type': 'application/json'
                })
            except:
                self.storage.from_(self.BUCKET_NAME).upload(path, content, {
                    'content-type': 'application/json'
                })
            
            self._cache[table_name] = data
            print(f"[StorageBucketDB] Saved {table_name}: {len(data)} records")
        except Exception as e:
            print(f"[StorageBucketDB] Error saving {table_name}: {e}")
            raise
    
    def table(self, table_name: str) -> 'StorageTable':
        """Return a table-like interface"""
        return StorageTable(self, table_name)


class StorageTable:
    """Mimics Supabase table interface using storage bucket"""
    
    def __init__(self, db: StorageBucketDB, table_name: str):
        self.db = db
        self.table_name = table_name
        self._query = {}
        self._single = False
    
    def select(self, columns: str = '*') -> 'StorageTable':
        return self
    
    def eq(self, column: str, value: Any) -> 'StorageTable':
        self._query[column] = value
        return self
    
    def maybe_single(self) -> 'StorageTable':
        self._single = True
        return self
    
    def single(self) -> 'StorageTable':
        self._single = True
        return self
    
    def insert(self, record: Dict) -> 'StorageTable':
        self._insert_data = record
        return self
    
    def upsert(self, record: Dict) -> 'StorageTable':
        self._upsert_data = record
        return self
    
    def update(self, record: Dict) -> 'StorageTable':
        self._update_data = record
        return self
    
    def execute(self) -> 'StorageResult':
        """Execute the query or write operation"""
        # Handle write operations
        if hasattr(self, '_insert_data'):
            return self._do_insert()
        if hasattr(self, '_upsert_data'):
            return self._do_upsert()
        if hasattr(self, '_update_data'):
            return self._do_update()
        
        # Handle read operation
        data = self.db._load_table(self.table_name)
        
        if self._query:
            results = []
            for key, record in data.items():
                match = all(record.get(k) == v for k, v in self._query.items())
                if match:
                    results.append(record)
            
            if self._single and results:
                return StorageResult(results[0])
            elif self._single:
                return StorageResult(None)
            return StorageResult(results)
        else:
            return StorageResult(list(data.values()))
    
    def _do_insert(self) -> 'StorageResult':
        record = self._insert_data
        data = self.db._load_table(self.table_name)
        
        if 'id' not in record:
            record['id'] = str(uuid.uuid4())
        
        key = record.get('student_id', record.get('id'))
        record['created_at'] = datetime.utcnow().isoformat()
        
        data[key] = record
        self.db._save_table(self.table_name, data)
        
        print(f"[StorageBucketDB] Inserted into {self.table_name}: {key}")
        return StorageResult([record])
    
    def _do_upsert(self) -> 'StorageResult':
        record = self._upsert_data
        data = self.db._load_table(self.table_name)
        
        key = record.get('student_id', str(uuid.uuid4()))
        
        if key in data:
            existing = data[key]
            existing.update(record)
            existing['updated_at'] = datetime.utcnow().isoformat()
            record = existing
        else:
            record['id'] = str(uuid.uuid4())
            record['created_at'] = datetime.utcnow().isoformat()
        
        data[key] = record
        self.db._save_table(self.table_name, data)
        
        print(f"[StorageBucketDB] Upserted into {self.table_name}: {key}")
        return StorageResult([record])
    
    def _do_update(self) -> 'StorageResult':
        updates = self._update_data
        data = self.db._load_table(self.table_name)
        updated = []
        
        for key, record in data.items():
            match = all(record.get(k) == v for k, v in self._query.items())
            if match:
                record.update(updates)
                record['updated_at'] = datetime.utcnow().isoformat()
                updated.append(record)
        
        self.db._save_table(self.table_name, data)
        print(f"[StorageBucketDB] Updated {len(updated)} records in {self.table_name}")
        return StorageResult(updated)


class StorageResult:
    """Mimics Supabase result object"""
    
    def __init__(self, data: Any):
        self.data = data
    
    def execute(self) -> 'StorageResult':
        return self