package sandbar

import (
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"runtime"
	"strings"
	"testing"
)

func TestVersionNewer(t *testing.T) {
	for _, c := range []struct {
		a, b string
		want bool
	}{
		{"v0.1.4", "v0.1.3", true},
		{"v0.2.0", "v0.1.9", true},
		{"v1.0.0", "v0.9.9", true},
		{"v0.1.3", "v0.1.3", false},
		{"v0.1.2", "v0.1.3", false},
		{"v0.1.10", "v0.1.9", true},
		{"v0.2.0-rc1", "v0.1.0", false}, // pre-releases are never offered
		{"v0.2.0", "dev", false},        // a development build never updates
		{"dev", "v0.1.0", false},
	} {
		if got := versionNewer(c.a, c.b); got != c.want {
			t.Errorf("versionNewer(%q, %q) = %v, want %v", c.a, c.b, got, c.want)
		}
	}
}

// The update page asks the release server and reports whether it has something newer.
func TestUpdateStatus(t *testing.T) {
	release := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Path != "/api/v1/repos/Veillax/sandbar/releases/latest" {
			http.NotFound(w, r)
			return
		}
		w.Write([]byte(`{"tag_name":"v0.2.0","assets":[]}`))
	}))
	defer release.Close()

	s, _, _ := newTestServer(t)
	s.opts.Version, s.opts.UpdateServer = "v0.1.0", release.URL
	ts := httptest.NewServer(s.Handler())
	defer ts.Close()
	c := newAPIClient(t, ts)

	if code := c.do("GET", "/api/v1/system/update", nil, nil); code != 401 {
		t.Fatalf("signed out: %d", code)
	}
	c.setup()
	var st map[string]any
	if code := c.do("GET", "/api/v1/system/update", nil, &st); code != 200 {
		t.Fatalf("status: %d", code)
	}
	if st["current"] != "v0.1.0" || st["latest"] != "v0.2.0" || st["newer"] != true {
		t.Fatalf("status: %v", st)
	}
	if st["error"] != "" {
		t.Fatalf("unexpected error: %v", st["error"])
	}

	// A development build can look but not install.
	s.opts.Version = "dev"
	s.upd.checked = s.upd.checked.AddDate(-1, 0, 0)
	if code := c.do("POST", "/api/v1/system/update", map[string]string{}, &st); code != 400 {
		t.Fatalf("a development build must not install: %d %v", code, st)
	}
}

// A newer binary on the data volume takes over from the image, and a stale one is removed.
func TestOverlay(t *testing.T) {
	if runtime.GOOS == "windows" {
		t.Skip("self-update is not supported on Windows")
	}
	dir := t.TempDir()
	bin := filepath.Join(dir, "bin")
	os.MkdirAll(bin, 0o755)
	overlay := filepath.Join(bin, "sandbar")
	script := func(version string) {
		os.WriteFile(overlay, []byte("#!/bin/sh\necho 'sandbar "+version+"'\n"), 0o755)
	}
	var logged []string
	logf := func(f string, a ...any) { logged = append(logged, f) }

	// An older overlay is deleted once the image is a release that has caught up.
	script("v0.1.0")
	UseNewerOverlay(dir, "v0.1.5", logf)
	if _, err := os.Stat(overlay); err == nil {
		t.Fatal("a stale overlay should be removed")
	}

	// A development image never deletes or switches to anything.
	script("v0.9.0")
	UseNewerOverlay(dir, "dev", logf)
	if _, err := os.Stat(overlay); err != nil {
		t.Fatal("a development build must leave the overlay alone")
	}

	// Something that does not report a version is ignored, not run.
	os.WriteFile(overlay, []byte("#!/bin/sh\necho hello\n"), 0o755)
	UseNewerOverlay(dir, "v0.1.5", logf)
	if len(logged) == 0 || !strings.Contains(logged[len(logged)-1], "did not report a version") {
		t.Fatalf("log: %v", logged)
	}
}