//go:build linux || freebsd

package config

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

func TestLoadWritesAndParsesDefault(t *testing.T) {
	path := filepath.Join(t.TempDir(), "config.toml")

	// The first Load writes the default template, then parses it back.
	cfg, err := Load(path)
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if cfg.Server.Port != 8080 {
		t.Errorf("Server.Port = %d, want 8080", cfg.Server.Port)
	}
	if cfg.DataDir != "./data" {
		t.Errorf("DataDir = %q, want ./data", cfg.DataDir)
	}
	if len(cfg.Forms) != 3 {
		t.Fatalf("len(Forms) = %d, want 3", len(cfg.Forms))
	}
	if cfg.Forms[0].Name != "contact" || cfg.Forms[0].SMTP.Host != "smtp.example.com" {
		t.Errorf("Forms[0] = %#v", cfg.Forms[0])
	}
	if cfg.Forms[2].RateLimitPerHour != 100 {
		t.Errorf("newsletter rate_limit_per_hour = %d, want 100", cfg.Forms[2].RateLimitPerHour)
	}
}

func TestLoadExpandsEnvVars(t *testing.T) {
	path := filepath.Join(t.TempDir(), "config.toml")
	doc := `
data_dir = "./data"

[server]
port = 9000

[[forms]]
name = "contact"
type = "contact"
path = "/api/nuntius/contact"
to = "you@example.com"

  [forms.smtp]
  host = "smtp.example.com"
  port = 587
  user = "u@example.com"
  password = "${NUNTIUS_TEST_PW}"
`
	if err := os.WriteFile(path, []byte(doc), 0o644); err != nil {
		t.Fatal(err)
	}
	t.Setenv("NUNTIUS_TEST_PW", "s3cret")

	cfg, err := Load(path)
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if cfg.Forms[0].SMTP.Password != "s3cret" {
		t.Errorf("password = %q, want s3cret", cfg.Forms[0].SMTP.Password)
	}
}

func TestLoadRejectsUnknownField(t *testing.T) {
	path := filepath.Join(t.TempDir(), "config.toml")
	doc := `
bogus = true

[server]
port = 8080

[[forms]]
name = "contact"
path = "/api/nuntius/contact"
to = "you@example.com"

  [forms.smtp]
  host = "smtp.example.com"
  port = 587
  user = "u@example.com"
`
	if err := os.WriteFile(path, []byte(doc), 0o644); err != nil {
		t.Fatal(err)
	}
	if _, err := Load(path); err == nil {
		t.Fatal("expected an error for an unknown field")
	}
}