package config

import (
	"bufio"
	"os"
	"strconv"
	"strings"
)

type Config struct {
	DatabaseURL              string
	SecretKey                string
	Algorithm                string
	AccessTokenExpireMinutes int

	AIBackend      string
	DeepSeekAPIKey string
	DeepSeekBaseURL string
	DeepSeekModel  string
	OllamaBaseURL  string
	OllamaModel    string
}

var Cfg = load()

func loadDotEnv() {
	f, err := os.Open(".env")
	if err != nil {
		return
	}
	defer f.Close()
	scanner := bufio.NewScanner(f)
	for scanner.Scan() {
		line := strings.TrimSpace(scanner.Text())
		if line == "" || strings.HasPrefix(line, "#") {
			continue
		}
		idx := strings.Index(line, "=")
		if idx <= 0 {
			continue
		}
		key := strings.TrimSpace(line[:idx])
		val := strings.Trim(strings.TrimSpace(line[idx+1:]), "\"'")
		if _, ok := os.LookupEnv(key); !ok {
			os.Setenv(key, val)
		}
	}
}

func getenv(key, def string) string {
	if v := os.Getenv(key); v != "" {
		return v
	}
	return def
}

func getenvInt(key string, def int) int {
	v := os.Getenv(key)
	if v == "" {
		return def
	}
	n, err := strconv.Atoi(v)
	if err != nil {
		return def
	}
	return n
}

func load() *Config {
	loadDotEnv()
	return &Config{
		DatabaseURL:              getenv("DATABASE_URL", "sqlite+aiosqlite:///./mmgame.db"),
		SecretKey:                getenv("SECRET_KEY", "mmgame-dev-secret-key-change-in-production"),
		Algorithm:                getenv("ALGORITHM", "HS256"),
		AccessTokenExpireMinutes: getenvInt("ACCESS_TOKEN_EXPIRE_MINUTES", 60*24*7),
		AIBackend:                getenv("AI_BACKEND", "rule"),
		DeepSeekAPIKey:           getenv("DEEPSEEK_API_KEY", ""),
		DeepSeekBaseURL:          getenv("DEEPSEEK_BASE_URL", "https://api.deepseek.com"),
		DeepSeekModel:            getenv("DEEPSEEK_MODEL", "deepseek-chat"),
		OllamaBaseURL:            getenv("OLLAMA_BASE_URL", "http://localhost:11434"),
		OllamaModel:              getenv("OLLAMA_MODEL", "qwen2.5:7b"),
	}
}