//go:build integration

package main

import (
	"bytes"
	"context"
	"encoding/json"
	"net"
	"net/http"
	"os"
	"path/filepath"
	"testing"
	"time"
)

func TestStartupShutdownPreservesConfiguration(t *testing.T) {
	address := os.Getenv("SAAS_MOCK_TEST_BROKER_URL")
	if address == "" {
		t.Skip("requires isolated test broker")
	}
	dir, id := fixture(t)
	reserve, err := net.Listen("tcp", "127.0.0.1:0")
	if err != nil {
		t.Fatal(err)
	}
	listen := reserve.Addr().String()
	reserve.Close()
	config := startupConfig{Listen: listen, DispatcherID: id, DispatcherSecret: "test-secret", BrokerURL: address, Snapshots: ".", Feedback: filepath.Join(t.TempDir(), "feedback")}
	raw, _ := json.Marshal(config)
	path := filepath.Join(dir, "server.json")
	if err = os.WriteFile(path, raw, 0600); err != nil {
		t.Fatal(err)
	}
	before := map[string][]byte{}
	if err = filepath.WalkDir(dir, func(p string, d os.DirEntry, e error) error {
		if e != nil {
			return e
		}
		if !d.IsDir() {
			before[p], e = os.ReadFile(p)
		}
		return e
	}); err != nil {
		t.Fatal(err)
	}
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()
	done := make(chan error, 1)
	go func() { done <- run(ctx, path) }()
	ready := false
	deadline := time.Now().Add(5 * time.Second)
	client := &http.Client{Timeout: time.Second}
	for time.Now().Before(deadline) {
		req, _ := http.NewRequest("GET", "http://"+listen+"/internal/v1/dispatcher/sip", nil)
		req.Header.Set("X-DISPATCHER-id", id)
		req.Header.Set("X-DISPATCHER-SECRET-KEY", "test-secret")
		resp, e := client.Do(req)
		if e == nil {
			resp.Body.Close()
			if resp.StatusCode == 200 {
				ready = true
				break
			}
		}
		select {
		case e = <-done:
			t.Fatalf("startup failed: %v", e)
		default:
		}
		time.Sleep(10 * time.Millisecond)
	}
	if !ready {
		t.Fatal("server did not become ready")
	}
	cancel()
	select {
	case err = <-done:
		if err != nil {
			t.Fatal(err)
		}
	case <-time.After(5 * time.Second):
		t.Fatal("shutdown timed out")
	}
	for p, want := range before {
		got, e := os.ReadFile(p)
		if e != nil || !bytes.Equal(got, want) {
			t.Fatalf("configuration changed on exit: %s %v", p, e)
		}
	}
	files, err := os.ReadDir(config.Feedback)
	if err != nil || len(files) != 0 {
		t.Fatalf("startup produced unsolicited feedback: %v %v", files, err)
	}
}