// Package postgres provides PostgreSQL database client for the KnowFoolery application.
package postgres

import (
	"context"
	"fmt"
	"time"
)

// Config holds the configuration for the PostgreSQL client.
type Config struct {
	Host            string
	Port            int
	User            string
	Password        string
	Database        string
	SSLMode         string
	MaxOpenConns    int
	MaxIdleConns    int
	ConnMaxLifetime time.Duration
	ConnMaxIdleTime time.Duration
}

// DefaultConfig returns a default configuration for development.
func DefaultConfig() Config {
	return Config{
		Host:            "localhost",
		Port:            5432,
		User:            "postgres",
		Password:        "postgres",
		Database:        "knowfoolery",
		SSLMode:         "disable",
		MaxOpenConns:    25,
		MaxIdleConns:    10,
		ConnMaxLifetime: 5 * time.Minute,
		ConnMaxIdleTime: 1 * time.Minute,
	}
}

// DSN returns the PostgreSQL connection string.
func (c Config) DSN() string {
	return fmt.Sprintf(
		"host=%s port=%d user=%s password=%s dbname=%s sslmode=%s",
		c.Host, c.Port, c.User, c.Password, c.Database, c.SSLMode,
	)
}

// URL returns the PostgreSQL connection URL.
func (c Config) URL() string {
	return fmt.Sprintf(
		"postgresql://%s:%s@%s:%d/%s?sslmode=%s",
		c.User, c.Password, c.Host, c.Port, c.Database, c.SSLMode,
	)
}

// Client wraps database operations.
// This is a placeholder that should be implemented with actual database client.
type Client struct {
	config Config
}

// NewClient creates a new PostgreSQL client.
// Note: Actual implementation should use Ent client from each service.
func NewClient(config Config) (*Client, error) {
	// This is a placeholder. The actual Ent client should be created
	// in each service's infrastructure layer.
	return &Client{
		config: config,
	}, nil
}

// Close closes the database connection.
func (c *Client) Close() error {
	// Placeholder for closing database connection
	return nil
}

// Ping checks if the database connection is alive.
func (c *Client) Ping(ctx context.Context) error {
	// Placeholder for ping implementation
	return nil
}

// HealthCheck performs a health check on the database.
func (c *Client) HealthCheck(ctx context.Context) error {
	ctx, cancel := context.WithTimeout(ctx, 5*time.Second)
	defer cancel()

	return c.Ping(ctx)
}

// ConfigFromEnv creates a Config from environment variables.
// This is a placeholder that should be implemented with actual env parsing.
func ConfigFromEnv() Config {
	// TODO: Implement environment variable parsing
	// Should use os.Getenv or a configuration library
	return DefaultConfig()
}