package main

import (
	"bufio"
	"bytes"
	"context"
	"encoding/json"
	"errors"
	"io"
	"net/http"
	"net/http/httptest"
	"net/url"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
	"syscall"
	"testing"
	"time"

	"github.com/gofiber/fiber/v3"
	"github.com/sirupsen/logrus"
	"github.com/spf13/cobra"
)

func TestAPIProxyPreservesMethodPathAndStatus(t *testing.T) {
	requests := make(chan *http.Request, 1)
	gateway := httptest.NewServer(http.HandlerFunc(func(response http.ResponseWriter, request *http.Request) {
		requests <- request
		response.WriteHeader(http.StatusServiceUnavailable)
	}))
	defer gateway.Close()

	upstream, err := url.Parse(gateway.URL)
	if err != nil {
		t.Fatal(err)
	}
	request := httptest.NewRequest(http.MethodPost, "/api/browsers/account-a/start?force=true", nil)
	response, err := newHandler(upstream, t.TempDir()).Test(request)
	if err != nil {
		t.Fatal(err)
	}
	defer response.Body.Close()

	proxied := <-requests
	if proxied.Method != http.MethodPost || proxied.URL.Path != "/v1/browsers/account-a/start" || proxied.URL.RawQuery != "force=true" {
		t.Fatalf("unexpected proxy request %s %s", proxied.Method, proxied.URL.String())
	}
	if response.StatusCode != http.StatusServiceUnavailable {
		t.Fatalf("expected upstream status 503, got %d", response.StatusCode)
	}
}

func TestLoadConfigRejectsInvalidGateway(t *testing.T) {
	t.Setenv("DOCKER_GATEWAY_URL", "file:///var/run/docker.sock")
	if _, err := loadConfig(); err == nil {
		t.Fatal("expected invalid gateway URL to be rejected")
	}
}

func TestLoadConfigRejectsInvalidDatabase(t *testing.T) {
	t.Setenv("DATABASE_URL", "file:///tmp/creatorhub.db")
	if _, err := loadConfig(); err == nil {
		t.Fatal("expected non-Postgres database URL to be rejected")
	}
}

func TestExecuteContextStopsOnSIGTERM(t *testing.T) {
	if os.Getenv("CREATORHUB_SIGTERM_HELPER") == "1" {
		command := &cobra.Command{Use: "shutdown-test", RunE: func(command *cobra.Command, _ []string) error {
			_, _ = os.Stdout.WriteString("ready\n")
			<-command.Context().Done()
			_, _ = os.Stdout.WriteString("stopped\n")
			return nil
		}}
		if err := execute(command); err != nil {
			t.Fatal(err)
		}
		return
	}

	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
	defer cancel()
	process := exec.CommandContext(ctx, os.Args[0], "-test.run=^TestExecuteContextStopsOnSIGTERM$")
	process.Env = append(os.Environ(), "CREATORHUB_SIGTERM_HELPER=1")
	stdout, err := process.StdoutPipe()
	if err != nil {
		t.Fatal(err)
	}
	if err := process.Start(); err != nil {
		t.Fatal(err)
	}
	scanner := bufio.NewScanner(stdout)
	if !scanner.Scan() || scanner.Text() != "ready" {
		t.Fatalf("helper did not become ready: %q err=%v", scanner.Text(), scanner.Err())
	}
	if err := process.Process.Signal(syscall.SIGTERM); err != nil {
		t.Fatal(err)
	}
	if !scanner.Scan() || scanner.Text() != "stopped" {
		t.Fatalf("helper did not finish cleanup: %q err=%v", scanner.Text(), scanner.Err())
	}
	if err := process.Wait(); err != nil || ctx.Err() != nil {
		t.Fatalf("process did not exit gracefully after SIGTERM: wait=%v context=%v", err, ctx.Err())
	}
}

func TestStartupLogRedactsGatewayURL(t *testing.T) {
	gateway, err := url.Parse("https://internal-user:internal-pass@docker-gateway:8443/v1?access_token=internal-token")
	if err != nil {
		t.Fatal(err)
	}
	logger := logrus.StandardLogger()
	previousOutput, previousFormatter, previousLevel := logger.Out, logger.Formatter, logger.Level
	t.Cleanup(func() {
		logrus.SetOutput(previousOutput)
		logrus.SetFormatter(previousFormatter)
		logrus.SetLevel(previousLevel)
	})
	var output bytes.Buffer
	logrus.SetOutput(&output)
	logrus.SetFormatter(&logrus.JSONFormatter{})
	logrus.SetLevel(logrus.InfoLevel)

	logStartup(config{listenAddr: ":8080", gateway: gateway})
	var entry map[string]any
	if err := json.Unmarshal(output.Bytes(), &entry); err != nil {
		t.Fatal(err)
	}
	if entry["docker_gateway"] != "https://docker-gateway:8443" {
		t.Fatalf("unexpected redacted gateway: %#v", entry["docker_gateway"])
	}
	for _, sensitive := range []string{"internal-user", "internal-pass", "access_token", "internal-token"} {
		if strings.Contains(output.String(), sensitive) {
			t.Fatalf("startup log leaked %q: %s", sensitive, output.String())
		}
	}
}

func TestPhaseARequestRejectsUnknownFields(t *testing.T) {
	app := fiber.New()
	app.Post("/", func(c fiber.Ctx) error {
		var input struct {
			ID string `json:"id"`
		}
		if err := decodePhaseA(c, &input); err != nil {
			return phaseAError(c, err)
		}
		return c.SendStatus(http.StatusNoContent)
	})
	response, err := app.Test(httptest.NewRequest(http.MethodPost, "/", strings.NewReader(`{"id":"account-a","password":"must-not-be-accepted"}`)))
	if err != nil {
		t.Fatal(err)
	}
	defer response.Body.Close()
	if response.StatusCode != http.StatusBadRequest {
		t.Fatalf("expected unknown sensitive field to be rejected, got %d", response.StatusCode)
	}
}

func TestPhaseAErrorRedactsInternalDetails(t *testing.T) {
	app := fiber.New()
	app.Get("/", func(c fiber.Ctx) error {
		return phaseAError(c, errors.New("database exposed a secret value"))
	})
	response, err := app.Test(httptest.NewRequest(http.MethodGet, "/", nil))
	if err != nil {
		t.Fatal(err)
	}
	defer response.Body.Close()
	body, _ := io.ReadAll(response.Body)
	if response.StatusCode != http.StatusInternalServerError || strings.Contains(string(body), "secret") || !strings.Contains(string(body), "phase A operation failed") {
		t.Fatalf("internal error was not redacted: status=%d body=%s", response.StatusCode, body)
	}
}

func TestSPAServesFileAndIndexFallback(t *testing.T) {
	directory := t.TempDir()
	files := map[string]string{
		"index.html":     "index",
		"app.js":         "asset",
		"hello world.js": "space",
		"应用.js":          "unicode",
	}
	for name, body := range files {
		if err := os.WriteFile(filepath.Join(directory, name), []byte(body), 0o600); err != nil {
			t.Fatal(err)
		}
	}
	if err := os.WriteFile(filepath.Join(directory, "..", "outside-secret.txt"), []byte("secret"), 0o600); err != nil {
		t.Fatal(err)
	}
	app := newHandler(&url.URL{Scheme: "http", Host: "127.0.0.1"}, directory)
	for path, want := range map[string]string{
		"/app.js":                      "asset",
		"/hello%20world.js":            "space",
		"/%E5%BA%94%E7%94%A8.js":       "unicode",
		"/%2e%2e%2foutside-secret.txt": "index",
		"/dashboard":                   "index",
	} {
		response, err := app.Test(httptest.NewRequest(http.MethodGet, path, nil))
		if err != nil {
			t.Fatal(err)
		}
		body, readErr := io.ReadAll(response.Body)
		response.Body.Close()
		if readErr != nil || response.StatusCode != http.StatusOK || string(body) != want {
			t.Fatalf("GET %s: status=%d body=%q err=%v", path, response.StatusCode, body, readErr)
		}
	}
}