package config

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

func TestLoadDefaults(t *testing.T) {
	clearEnv(t)
	c, err := Load()
	if err != nil {
		t.Fatal(err)
	}
	if c.ListenAddr != ":8000" {
		t.Errorf("ListenAddr = %q", c.ListenAddr)
	}
	if c.CacheTTL != 30*time.Second {
		t.Errorf("CacheTTL = %v", c.CacheTTL)
	}
	if c.DefaultTemplate != "almalinux9" {
		t.Errorf("DefaultTemplate = %q", c.DefaultTemplate)
	}
	if c.PuppetServer != "puppet.k8s.syd1.au.unkin.net" || c.PuppetCAServer != "puppetca.k8s.syd1.au.unkin.net" {
		t.Errorf("puppet servers = %q / %q", c.PuppetServer, c.PuppetCAServer)
	}
	if c.PuppetCAURL != "puppetca.k8s.syd1.au.unkin.net" {
		t.Errorf("PuppetCAURL = %q", c.PuppetCAURL)
	}
	if c.UnknownMACFallback != "local" {
		t.Errorf("UnknownMACFallback = %q", c.UnknownMACFallback)
	}
	if len(c.Nameservers) != 1 || c.Nameservers[0] != "198.18.200.7" {
		t.Errorf("default nameservers = %v, want [198.18.200.7]", c.Nameservers)
	}
	if c.TemplateGitInterval != 3*time.Minute {
		t.Errorf("TemplateGitInterval = %v, want 3m", c.TemplateGitInterval)
	}
	if c.ArtifactBaseURL != "https://artifactapi.k8s.syd1.au.unkin.net/api/v1/remote" {
		t.Errorf("ArtifactBaseURL = %q", c.ArtifactBaseURL)
	}
}

func TestCallbackBaseDefaultsToBase(t *testing.T) {
	clearEnv(t)
	t.Setenv("BOOTAPI_BASE_URL", "http://bootapi.example.net/")
	c, err := Load()
	if err != nil {
		t.Fatal(err)
	}
	if c.BaseURL != "http://bootapi.example.net" || c.CallbackBaseURL != "http://bootapi.example.net" {
		t.Errorf("base=%q callback=%q; callback should default to base", c.BaseURL, c.CallbackBaseURL)
	}
}

func TestProvisionTokenFile(t *testing.T) {
	clearEnv(t)
	dir := t.TempDir()
	tf := filepath.Join(dir, "tok")
	if err := os.WriteFile(tf, []byte(" prov-secret\n"), 0o600); err != nil {
		t.Fatal(err)
	}
	t.Setenv("BOOTAPI_PROVISION_TOKEN_FILE", tf)
	c, err := Load()
	if err != nil {
		t.Fatal(err)
	}
	if c.ProvisionToken != "prov-secret" {
		t.Errorf("ProvisionToken = %q", c.ProvisionToken)
	}
}

func TestLoadTokenFile(t *testing.T) {
	clearEnv(t)
	dir := t.TempDir()
	tf := filepath.Join(dir, "token")
	if err := os.WriteFile(tf, []byte("  secret-token\n"), 0o600); err != nil {
		t.Fatal(err)
	}
	t.Setenv("BOOTAPI_NETBOX_TOKEN_FILE", tf)
	c, err := Load()
	if err != nil {
		t.Fatal(err)
	}
	if c.NetBoxToken != "secret-token" {
		t.Errorf("token = %q, want trimmed file contents", c.NetBoxToken)
	}
}

func TestLoadRejectsBadFallback(t *testing.T) {
	clearEnv(t)
	t.Setenv("BOOTAPI_UNKNOWN_MAC_FALLBACK", "bogus")
	if _, err := Load(); err == nil {
		t.Fatal("expected error for invalid fallback")
	}
}

func TestLoadListsAndTrim(t *testing.T) {
	clearEnv(t)
	t.Setenv("BOOTAPI_NAMESERVERS", " 10.0.0.1, 10.0.0.2 ,")
	t.Setenv("BOOTAPI_NETBOX_URL", "https://netbox.example.net/")
	c, err := Load()
	if err != nil {
		t.Fatal(err)
	}
	if len(c.Nameservers) != 2 || c.Nameservers[1] != "10.0.0.2" {
		t.Errorf("nameservers = %v", c.Nameservers)
	}
	if c.NetBoxURL != "https://netbox.example.net" {
		t.Errorf("NetBoxURL trailing slash not trimmed: %q", c.NetBoxURL)
	}
}

// clearEnv unsets every BOOTAPI_* var so a developer's shell can't leak into
// the test. t.Setenv restores them after the test.
func clearEnv(t *testing.T) {
	t.Helper()
	for _, kv := range os.Environ() {
		if k, _, ok := cut(kv, '='); ok && len(k) > 8 && k[:8] == "BOOTAPI_" {
			// t.Setenv to "" is enough: Load treats empty as unset, and the
			// test framework restores the original value on cleanup.
			t.Setenv(k, "")
		}
	}
}

func cut(s string, sep byte) (before, after string, found bool) {
	for i := 0; i < len(s); i++ {
		if s[i] == sep {
			return s[:i], s[i+1:], true
		}
	}
	return s, "", false
}