package models

import (
	"database/sql"
	"fmt"

	"simple_portal/database"
)

// Predefined search engine URL templates.
const (
	SearchEngineGoogle = "https://www.google.com/search?q=%s"
	SearchEngineBing   = "https://www.bing.com/search?q=%s"
	SearchEngineBaidu  = "https://www.baidu.com/s?wd=%s"
)

// SettingKey constants.
const (
	SettingKeySearchEngine      = "search_engine"
	SettingKeyHomepageTitle     = "homepage_title"
	SettingKeyHomepageSubtitle  = "homepage_subtitle"
	SettingKeyHomepageBackground = "homepage_background"
)

// Default setting values.
const (
	DefaultHomepageTitle     = "Portal"
	DefaultHomepageSubtitle  = ""
	DefaultHomepageBackground = ""
)

// GetSetting retrieves a setting value by key. Returns empty string if not found.
func GetSetting(key string) (string, error) {
	var value sql.NullString
	err := database.DB.QueryRow("SELECT value FROM settings WHERE key = ?", key).Scan(&value)
	if err == sql.ErrNoRows {
		return "", nil
	}
	if err != nil {
		return "", fmt.Errorf("failed to get setting %s: %w", key, err)
	}
	return value.String, nil
}

// SetSetting inserts or updates a setting value by key.
func SetSetting(key, value string) error {
	_, err := database.DB.Exec(
		"INSERT INTO settings (key, value) VALUES (?, ?) ON CONFLICT(key) DO UPDATE SET value = ?",
		key, value, value,
	)
	if err != nil {
		return fmt.Errorf("failed to set setting %s: %w", key, err)
	}
	return nil
}