package config

import (
	"fmt"
	"log"
	"os"
	"strconv"

	"github.com/joho/godotenv"
)

// Config holds all configuration for the pure Matrix Appservice ↔ Sneedchat bridge.
type Config struct {
	// --- Sneedchat ---
	SneedchatRoomID int        // numeric Siropu/Sneedchat room ID
	BridgeUsername  string     // XenForo username used to authenticate
	BridgePassword  string     // XenForo password
	BridgeUserID    int        // numeric XenForo user_id (optional, used for echo-suppression)
	Debug           bool       // verbose logging

	// --- Matrix Appservice ---
	MatrixAppserviceToken string // token used to authenticate HS → AS
	MatrixGhostUserDomain string // domain for generated ghost MXIDs
	MatrixGhostUserPrefix string // prefix for ghost MXIDs ("" = none)
	AppserviceListenAddr  string // HTTP listen address, e.g. ":29333"
}

// Load loads all settings from .env into a Config struct.
func Load(envFile string) (*Config, error) {
	if err := godotenv.Load(envFile); err != nil {
		log.Printf("⚠️  Warning: could not load %s: %v", envFile, err)
	}

	cfg := &Config{
		// Sneedchat credentials
		BridgeUsername: getenv("BRIDGE_USERNAME", ""),
		BridgePassword: getenv("BRIDGE_PASSWORD", ""),

		// Matrix Appservice fields
		MatrixAppserviceToken: getenv("MATRIX_APPSERVICE_TOKEN", ""),
		MatrixGhostUserDomain: getenv("MATRIX_GHOST_USER_DOMAIN", "sneedchat.kiwifarms.net"),
		MatrixGhostUserPrefix: getenv("MATRIX_GHOST_USER_PREFIX", ""),

		// Appservice listen address
		AppserviceListenAddr: getenv("APPSERVICE_LISTEN_ADDR", ":29333"),
	}

	// Debug flag
	switch v := getenv("DEBUG", ""); v {
	case "1", "true", "TRUE", "True":
		cfg.Debug = true
	}

	// Required Sneedchat room ID
	roomRaw := getenv("SNEEDCHAT_ROOM_ID", "")
	roomID, err := strconv.Atoi(roomRaw)
	if err != nil {
		return nil, fmt.Errorf("invalid SNEEDCHAT_ROOM_ID: %s", roomRaw)
	}
	cfg.SneedchatRoomID = roomID

	// Optional: user ID for echo suppression
	if v := getenv("BRIDGE_USER_ID", ""); v != "" {
		id, _ := strconv.Atoi(v)
		cfg.BridgeUserID = id
	}

	return cfg, nil
}

// getenv returns environment variable k or default def.
func getenv(k, def string) string {
	if v := os.Getenv(k); v != "" {
		return v
	}
	return def
}