package main

import (
	"io/fs"
	"net/http"
	"strings"
	"testing"
	"testing/fstest"
)

func TestLoadReleases(t *testing.T) {
	fsys := fstest.MapFS{
		"README.md":              {Data: []byte("# Index, not a release\n")},
		"001-first/README.md":    {Data: []byte("# First\n\nBranch `a` · version (none)\n\nBody one.\n")},
		"002-second/README.md":   {Data: []byte("# Second\r\n\r\nBranch `b` · version 0.2.0\r\n\r\n- **Version:** 0.2.0\r\n")},
		"002-second/desktop.png": {Data: []byte("png")},
		"003-no-title/README.md": {Data: []byte("No heading here.\n")},
		"004-no-readme/x.png":    {Data: []byte("png")},
		"Bad_Name/README.md":     {Data: []byte("# Bad\n")},
	}
	list, byID, err := loadReleases(fsys, newMarkdown())
	if err != nil {
		t.Fatal(err)
	}
	if len(list) != 2 || list[0].ID != "002-second" || list[1].ID != "001-first" {
		t.Fatalf("got %d releases, want 002 then 001: %+v", len(list), list)
	}
	r := byID["002-second"]
	if r.Number != "002" || r.Title != "Second" || r.Version != "0.2.0" {
		t.Errorf("002: %+v", r)
	}
	if byID["001-first"].Version != "" {
		t.Errorf("001: version = %q, want none", byID["001-first"].Version)
	}
	if strings.Contains(string(r.HTML), "<h1") {
		t.Errorf("title heading repeated in body: %s", r.HTML)
	}
}

// Every record committed under pull-releases/ must load, so a malformed one
// fails the build's tests instead of silently disappearing from the site.
func TestEmbeddedReleasesAllLoad(t *testing.T) {
	relFS, err := fs.Sub(releaseFS, "pull-releases")
	if err != nil {
		t.Fatal(err)
	}
	entries, err := fs.ReadDir(relFS, ".")
	if err != nil {
		t.Fatal(err)
	}
	var dirs int
	for _, e := range entries {
		if e.IsDir() {
			dirs++
			if !releaseDir.MatchString(e.Name()) {
				t.Errorf("pull-releases/%s: folder name must be NNN-name", e.Name())
			}
			for _, img := range []string{"desktop.png", "mobile.png"} {
				if _, err := fs.Stat(relFS, e.Name()+"/"+img); err != nil {
					t.Errorf("pull-releases/%s: missing %s", e.Name(), img)
				}
			}
		}
	}
	list, _, err := loadReleases(relFS, newMarkdown())
	if err != nil {
		t.Fatal(err)
	}
	if len(list) != dirs || dirs == 0 {
		t.Errorf("loaded %d releases from %d folders", len(list), dirs)
	}
}

func TestReleasePages(t *testing.T) {
	srv, _ := newTestServer(t, nil)
	const id = "003-css-cache-busting"

	status, _, body := get(t, srv, "/releases")
	if status != 200 {
		t.Fatalf("/releases: status = %d", status)
	}
	for _, want := range []string{
		"<h1>Release notes</h1>",
		`<a href="/releases/` + id + `/">`,
		`<a href="/releases/001-initial/">Add Markdown blog server</a>`,
		"#003 · version 0.2.1",
	} {
		if !strings.Contains(body, want) {
			t.Errorf("/releases: missing %q", want)
		}
	}
	if strings.Index(body, "003-css") > strings.Index(body, "001-initial") {
		t.Error("/releases: newest release should be listed first")
	}

	status, _, body = get(t, srv, "/releases/"+id+"/")
	if status != 200 {
		t.Fatalf("release page: status = %d", status)
	}
	for _, want := range []string{
		"<h1>Add content hash to stylesheet URL; start pull-releases records</h1>",
		`<span class="meta">Release #003</span>`,
		`<img src="desktop.png" alt="Desktop">`,
		`<a href="/releases">`,
	} {
		if !strings.Contains(body, want) {
			t.Errorf("release page: missing %q", want)
		}
	}

	status, h, img := get(t, srv, "/releases/"+id+"/desktop.png")
	if status != 200 || h.Get("Content-Type") != "image/png" || !strings.HasPrefix(img, "\x89PNG") {
		t.Errorf("screenshot: status = %d, type = %q", status, h.Get("Content-Type"))
	}

	for _, path := range []string{
		"/releases/nope/",
		"/releases/nope",
		"/releases/" + id + "/README.md",
		"/releases/" + id + "/missing.png",
		"/releases/" + id + "/..%2f..%2fmain.go",
		"/releases/README.md",
	} {
		if status, _, _ := get(t, srv, path); status != 404 {
			t.Errorf("%s: status = %d, want 404", path, status)
		}
	}
}

func TestReleaseRedirect(t *testing.T) {
	srv, _ := newTestServer(t, nil)
	client := &http.Client{CheckRedirect: func(*http.Request, []*http.Request) error { return http.ErrUseLastResponse }}
	resp, err := client.Get(srv.URL + "/releases/001-initial")
	if err != nil {
		t.Fatal(err)
	}
	resp.Body.Close()
	if resp.StatusCode != 301 || resp.Header.Get("Location") != "/releases/001-initial/" {
		t.Errorf("status = %d, Location = %q", resp.StatusCode, resp.Header.Get("Location"))
	}
}

func TestAboutLinksToReleases(t *testing.T) {
	srv, _ := newTestServer(t, nil)
	_, _, body := get(t, srv, "/about")
	if !strings.Contains(body, "<dt>Release notes</dt>") || !strings.Contains(body, `<a href="/releases">`) {
		t.Errorf("About page has no release notes link:\n%s", body)
	}
}