package config

import (
	"fmt"
	"log"
	"os"
	"path/filepath"
	legacy "weatherstation/internal/config"

	"gopkg.in/yaml.v3"
)

type Config struct {
	Addr          string
	UIServeDir    string
	BigscreenDir  string
	TemplateDir   string
	StaticDir     string
	DevEnableCORS bool
	Legacy        *legacy.Config
	SMS           SmsConfig
	AuthSecret    string
}

// SmsConfig holds Aliyun SMS settings loaded from config/env.
type SmsConfig struct {
	AccessKeyID     string
	AccessKeySecret string
	SignName        string
	TemplateCode    string
	Endpoint        string // optional, default dysmsapi.aliyuncs.com
}

func Load() Config {
	lg := legacy.GetConfig()

	port := lg.Server.WebPort
	if port <= 0 {
		port = 8080
	}

	cfg := Config{
		Addr:          fmt.Sprintf(":%d", port),
		UIServeDir:    "core/frontend/dist/ui",
		BigscreenDir:  "core/frontend/dist/bigscreen",
		TemplateDir:   "templates",
		StaticDir:     "static",
		DevEnableCORS: true,
		Legacy:        lg,
		SMS:           SmsConfig{},
		AuthSecret:    "change-me-dev", // default dev secret; override with CORE_AUTH_SECRET
	}

	// Try load SMS from YAML (same search order as legacy)
	type smsAliyun struct {
		AccessKeyID     string `yaml:"access_key_id"`
		AccessKeySecret string `yaml:"access_key_secret"`
		SignName        string `yaml:"sign_name"`
		TemplateCode    string `yaml:"template_code"`
		Endpoint        string `yaml:"endpoint"`
	}
	var smsFile struct {
		SMS struct {
			Enabled  bool      `yaml:"enabled"`
			Provider string    `yaml:"provider"`
			Aliyun   smsAliyun `yaml:"aliyun"`
		} `yaml:"sms"`
	}
	// Probe possible locations
	exePath, _ := os.Executable()
	exeDir := ""
	if exePath != "" {
		exeDir = filepath.Dir(exePath)
	}
	candidates := []string{
		filepath.Join(exeDir, "config.yaml"),
		filepath.Join(exeDir, "..", "config.yaml"),
		"config.yaml",
		"../config.yaml",
		"../../config.yaml",
		"/etc/weatherstation/config.yaml",
		filepath.Join(os.Getenv("HOME"), ".weatherstation", "config.yaml"),
	}
	for _, p := range candidates {
		if b, err := os.ReadFile(p); err == nil {
			if err := yaml.Unmarshal(b, &smsFile); err == nil {
				cfg.SMS.AccessKeyID = smsFile.SMS.Aliyun.AccessKeyID
				cfg.SMS.AccessKeySecret = smsFile.SMS.Aliyun.AccessKeySecret
				if v := smsFile.SMS.Aliyun.SignName; v != "" {
					cfg.SMS.SignName = v
				}
				if v := smsFile.SMS.Aliyun.TemplateCode; v != "" {
					cfg.SMS.TemplateCode = v
				}
				if v := smsFile.SMS.Aliyun.Endpoint; v != "" {
					cfg.SMS.Endpoint = v
				}
			}
			break
		}
	}

	if v := os.Getenv("CORE_ADDR"); v != "" {
		cfg.Addr = v
	}
	if v := os.Getenv("CORE_UI_DIR"); v != "" {
		cfg.UIServeDir = v
	}
	if v := os.Getenv("CORE_BIGSCREEN_DIR"); v != "" {
		cfg.BigscreenDir = v
	}
	if v := os.Getenv("CORE_TEMPLATE_DIR"); v != "" {
		cfg.TemplateDir = v
	}
	if v := os.Getenv("CORE_STATIC_DIR"); v != "" {
		cfg.StaticDir = v
	}
	if v := os.Getenv("CORE_ENABLE_CORS"); v != "" {
		if v == "0" || v == "false" {
			cfg.DevEnableCORS = false
		} else {
			cfg.DevEnableCORS = true
		}
	}

	// Auth secret; do not log value
	if v := os.Getenv("CORE_AUTH_SECRET"); v != "" {
		cfg.AuthSecret = v
	}

	// SMS settings (do not log secrets)
	if v := os.Getenv("CORE_SMS_AK"); v != "" {
		cfg.SMS.AccessKeyID = v
	}
	if v := os.Getenv("CORE_SMS_SK"); v != "" {
		cfg.SMS.AccessKeySecret = v
	}
	if v := os.Getenv("CORE_SMS_SIGN"); v != "" {
		cfg.SMS.SignName = v
	}
	if v := os.Getenv("CORE_SMS_TPL"); v != "" {
		cfg.SMS.TemplateCode = v
	}
	if v := os.Getenv("CORE_SMS_ENDPOINT"); v != "" {
		cfg.SMS.Endpoint = v
	}

	log.Printf("config: addr=%s ui=%s bigscreen=%s tpl=%s static=%s cors=%v sms.sign=%v sms.tpl=%v auth.secret=%v", cfg.Addr, cfg.UIServeDir, cfg.BigscreenDir, cfg.TemplateDir, cfg.StaticDir, cfg.DevEnableCORS, cfg.SMS.SignName != "", cfg.SMS.TemplateCode != "", cfg.AuthSecret != "")
	return cfg
}