"""Database for conversations and distillation data"""

import sqlite3
from datetime import datetime
from typing import List, Dict
from config import DATABASE_PATH


class VedaDatabase:
    """Database handler with distillation support"""

    def __init__(self):
        self._init_db()

    def _get_conn(self):
        conn = sqlite3.connect(DATABASE_PATH)
        conn.row_factory = sqlite3.Row
        return conn

    def _init_db(self):
        conn = self._get_conn()
        cursor = conn.cursor()

        # Regular conversations table
        cursor.execute('''
            CREATE TABLE IF NOT EXISTS conversations (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                timestamp DATETIME DEFAULT CURRENT_TIMESTAMP,
                user_input TEXT NOT NULL,
                assistant_response TEXT NOT NULL,
                feedback INTEGER DEFAULT 0
            )
        ''')

        # Distillation data table (teacher responses)
        cursor.execute('''
            CREATE TABLE IF NOT EXISTS distillation_data (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                timestamp DATETIME DEFAULT CURRENT_TIMESTAMP,
                user_input TEXT NOT NULL,
                teacher_response TEXT NOT NULL,
                student_response TEXT,
                used_for_training BOOLEAN DEFAULT 0,
                quality_score REAL DEFAULT 0
            )
        ''')

        # Training history
        cursor.execute('''
            CREATE TABLE IF NOT EXISTS training_history (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                timestamp DATETIME DEFAULT CURRENT_TIMESTAMP,
                training_type TEXT,
                samples_used INTEGER,
                epochs INTEGER,
                final_loss REAL
            )
        ''')

        conn.commit()
        conn.close()

    # ===== Conversations =====
    def save_conversation(self, user_input: str, response: str) -> int:
        conn = self._get_conn()
        cursor = conn.cursor()

        cursor.execute('''
            INSERT INTO conversations (user_input, assistant_response)
            VALUES (?, ?)
        ''', (user_input, response))

        conv_id = cursor.lastrowid
        conn.commit()
        conn.close()

        return conv_id

    def update_feedback(self, conv_id: int, feedback: int):
        conn = self._get_conn()
        cursor = conn.cursor()

        cursor.execute('''
            UPDATE conversations SET feedback = ? WHERE id = ?
        ''', (feedback, conv_id))

        conn.commit()
        conn.close()

    def get_good_conversations(self, limit: int = 100) -> List[Dict]:
        conn = self._get_conn()
        cursor = conn.cursor()

        cursor.execute('''
            SELECT user_input, assistant_response
            FROM conversations
            WHERE feedback > 0
            ORDER BY timestamp DESC
            LIMIT ?
        ''', (limit,))

        rows = cursor.fetchall()
        conn.close()

        return [dict(row) for row in rows]

    # ===== Distillation =====
    def save_distillation_data(
        self,
        user_input: str,
        teacher_response: str,
        student_response: str = None,
        quality_score: float = 0.0
    ) -> int:
        conn = self._get_conn()
        cursor = conn.cursor()

        cursor.execute('''
            INSERT INTO distillation_data 
            (user_input, teacher_response, student_response, quality_score)
            VALUES (?, ?, ?, ?)
        ''', (user_input, teacher_response, student_response, quality_score))

        data_id = cursor.lastrowid
        conn.commit()
        conn.close()

        return data_id

    def get_unused_distillation_data(self, limit: int = 500) -> List[Dict]:
        """Get teacher responses not yet used for training"""
        conn = self._get_conn()
        cursor = conn.cursor()

        cursor.execute('''
            SELECT id, user_input, teacher_response
            FROM distillation_data
            WHERE used_for_training = 0
            ORDER BY timestamp DESC
            LIMIT ?
        ''', (limit,))

        rows = cursor.fetchall()
        conn.close()

        return [dict(row) for row in rows]

    def mark_distillation_used(self, ids: List[int]):
        """Mark distillation data as used for training"""
        conn = self._get_conn()
        cursor = conn.cursor()

        placeholders = ",".join("?" * len(ids))
        cursor.execute(f'''
            UPDATE distillation_data
            SET used_for_training = 1
            WHERE id IN ({placeholders})
        ''', ids)

        conn.commit()
        conn.close()

    def get_distillation_count(self) -> Dict:
        """Get count of distillation data"""
        conn = self._get_conn()
        cursor = conn.cursor()

        cursor.execute('SELECT COUNT(*) FROM distillation_data')
        total = cursor.fetchone()[0]

        cursor.execute('SELECT COUNT(*) FROM distillation_data WHERE used_for_training = 0')
        unused = cursor.fetchone()[0]

        cursor.execute('SELECT COUNT(*) FROM distillation_data WHERE used_for_training = 1')
        used = cursor.fetchone()[0]

        conn.close()

        return {"total": total, "unused": unused, "used": used}

    # ===== Stats =====
    def get_stats(self) -> Dict:
        conn = self._get_conn()
        cursor = conn.cursor()

        cursor.execute('SELECT COUNT(*) FROM conversations')
        total = cursor.fetchone()[0]

        cursor.execute('SELECT COUNT(*) FROM conversations WHERE feedback > 0')
        positive = cursor.fetchone()[0]

        cursor.execute('SELECT COUNT(*) FROM conversations WHERE feedback < 0')
        negative = cursor.fetchone()[0]

        distill = self.get_distillation_count()

        conn.close()

        return {
            "total": total,
            "positive": positive,
            "negative": negative,
            "distillation_total": distill["total"],
            "distillation_unused": distill["unused"],
        }

    def save_training_history(
        self,
        training_type: str,
        samples_used: int,
        epochs: int,
        final_loss: float
    ):
        conn = self._get_conn()
        cursor = conn.cursor()

        cursor.execute('''
            INSERT INTO training_history (training_type, samples_used, epochs, final_loss)
            VALUES (?, ?, ?, ?)
        ''', (training_type, samples_used, epochs, final_loss))

        conn.commit()
        conn.close()


db = VedaDatabase()