first commit

config/config.go

@@ -0,0 +1,65 @@
+package config
+
+import (
+	"os"
+	"strconv"
+)
+
+// Config holds all runtime configuration loaded from environment variables.
+type Config struct {
+	Port                  string
+	OpenAIBackend         string
+	OpenAIApiKey          string
+	PostgresDSN           string
+	DBPath                string // SQLite database file path (when DB_MODE=sqlite)
+	DBMode                string // "sqlite" or "pgs" — selects database driver
+	LogLevel              string // "debug", "info", or "warn" — console log verbosity
+	RequestTimeoutSeconds int
+	OpenAIModel           string // default model when client omits it
+}
+
+// Load reads environment variables and returns a populated Config.
+// All values MUST come from env — no hardcoded IPs or ports.
+func Load() *Config {
+	timeoutSec := 30
+	if v := os.Getenv("REQUEST_TIMEOUT_SECONDS"); v != "" {
+		if parsed, err := strconv.Atoi(v); err == nil {
+			timeoutSec = parsed
+		}
+	}
+
+	dbMode := os.Getenv("DB_MODE")
+	dbPath := os.Getenv("DB_PATH")
+	logLevel := os.Getenv("LOG_LEVEL")
+
+	// Support both POSTGRES_DSN and DATABASE_DSN env keys
+	postgresDSN := os.Getenv("POSTGRES_DSN")
+	if postgresDSN == "" {
+		postgresDSN = os.Getenv("DATABASE_DSN")
+	}
+
+	port := os.Getenv("PORT")
+	if port == "" {
+		port = "8000"
+	}
+
+	openAIBackend := os.Getenv("OPENAI_BACKEND")
+	if openAIBackend == "" {
+		openAIBackend = "https://api.deepseek.com"
+	}
+
+	openAIApiKey := os.Getenv("OPENAI_KEY")
+	openAIModel := os.Getenv("OPENAI_MODEL")
+
+	return &Config{
+		Port:                  port,
+		OpenAIBackend:         openAIBackend,
+		OpenAIApiKey:          openAIApiKey,
+		PostgresDSN:           postgresDSN,
+		DBPath:                dbPath,
+		DBMode:                dbMode,
+		LogLevel:              logLevel,
+		RequestTimeoutSeconds: timeoutSec,
+		OpenAIModel:           openAIModel,
+	}
+}