package config

import (
	"path/filepath"
	"testing"
	"time"
)

func TestLoad(t *testing.T) {
	// 屏蔽外部 env,保证默认值断言自洽(Load 将空串视为未设置)
	t.Setenv("BOOKS_DIR", "")
	t.Setenv("CACHE_DIR", "")
	t.Setenv("ADDR", "")
	t.Setenv("JWT_SECRET", "")
	if _, err := Load(); err == nil {
		t.Fatal("missing JWT_SECRET must fail")
	}
	t.Setenv("JWT_SECRET", "x")
	t.Setenv("SCAN_INTERVAL_SEC", "abc")
	if _, err := Load(); err == nil {
		t.Fatal("bad interval must fail")
	}
	t.Setenv("SCAN_INTERVAL_SEC", "30")
	t.Setenv("DATABASE_URL", "postgres://x")
	t.Setenv("TRUSTED_PROXY_CIDRS", "")
	c, err := Load()
	if err != nil {
		t.Fatal(err)
	}
	// Load 会 EvalSymlinks 解析 BooksDir(任务10 裁定),这里做同样的期望值解析
	wantBooks := "/data/books"
	if r, e := filepath.EvalSymlinks(wantBooks); e == nil {
		wantBooks = r
	}
	if c.ScanInterval != 30*time.Second || c.BooksDir != wantBooks || c.Addr != ":8080" {
		t.Fatalf("%+v", c)
	}
	if len(c.TrustedProxies) != 1 || c.TrustedProxies[0] != "172.16.0.0/12" {
		t.Fatalf("trusted proxies default: %+v", c.TrustedProxies)
	}
	t.Setenv("TRUSTED_PROXY_CIDRS", "10.0.0.0/8, 1.2.3.4")
	c, err = Load()
	if err != nil {
		t.Fatal(err)
	}
	if len(c.TrustedProxies) != 2 || c.TrustedProxies[0] != "10.0.0.0/8" || c.TrustedProxies[1] != "1.2.3.4" {
		t.Fatalf("trusted proxies override: %+v", c.TrustedProxies)
	}
}