package eventlogger

import (
	"database/sql"
	"encoding/json"
	"fmt"
	"os"
	"path/filepath"
	"sync"

	"git.warky.dev/wdevs/whatshooked/internal/config"
	"git.warky.dev/wdevs/whatshooked/internal/events"

	_ "github.com/mattn/go-sqlite3" // SQLite driver
)

// SQLiteTarget logs events to SQLite database
type SQLiteTarget struct {
	db        *sql.DB
	tableName string
	mu        sync.Mutex
}

// NewSQLiteTarget creates a new SQLite logging target
func NewSQLiteTarget(dbConfig config.DatabaseConfig, tableName string) (*SQLiteTarget, error) {
	// Use the SQLite path from config (defaults to "./data/events.db")
	dbPath := dbConfig.SQLitePath

	// Create directory if needed
	dir := filepath.Dir(dbPath)
	if err := os.MkdirAll(dir, 0755); err != nil {
		return nil, fmt.Errorf("failed to create database directory: %w", err)
	}

	// Open SQLite connection
	db, err := sql.Open("sqlite3", dbPath)
	if err != nil {
		return nil, fmt.Errorf("failed to open SQLite database: %w", err)
	}

	target := &SQLiteTarget{
		db:        db,
		tableName: tableName,
	}

	// Create table if it doesn't exist
	if err := target.createTable(); err != nil {
		db.Close()
		return nil, err
	}

	return target, nil
}

// createTable creates the event logs table if it doesn't exist
func (st *SQLiteTarget) createTable() error {
	query := fmt.Sprintf(`
		CREATE TABLE IF NOT EXISTS %s (
			id INTEGER PRIMARY KEY AUTOINCREMENT,
			event_type TEXT NOT NULL,
			timestamp DATETIME NOT NULL,
			data TEXT NOT NULL,
			created_at DATETIME DEFAULT CURRENT_TIMESTAMP
		)
	`, st.tableName)

	if _, err := st.db.Exec(query); err != nil {
		return fmt.Errorf("failed to create table: %w", err)
	}

	// Create index on event_type and timestamp
	indexQuery := fmt.Sprintf(`
		CREATE INDEX IF NOT EXISTS idx_%s_type_timestamp
		ON %s(event_type, timestamp)
	`, st.tableName, st.tableName)

	if _, err := st.db.Exec(indexQuery); err != nil {
		return fmt.Errorf("failed to create index: %w", err)
	}

	return nil
}

// Log writes an event to SQLite database
func (st *SQLiteTarget) Log(event events.Event) error {
	st.mu.Lock()
	defer st.mu.Unlock()

	// Marshal event data to JSON
	data, err := json.Marshal(event.Data)
	if err != nil {
		return fmt.Errorf("failed to marshal event data: %w", err)
	}

	query := fmt.Sprintf(`
		INSERT INTO %s (event_type, timestamp, data)
		VALUES (?, ?, ?)
	`, st.tableName)

	_, err = st.db.Exec(query, string(event.Type), event.Timestamp, string(data))
	if err != nil {
		return fmt.Errorf("failed to insert event: %w", err)
	}

	return nil
}

// Close closes the SQLite database connection
func (st *SQLiteTarget) Close() error {
	return st.db.Close()
}