package classes_test

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

	"git.golem15.com/golem15/sm-sitemap-plugin/classes"
)

// TestManifest pins the updates manifest reader: it fails safe (a missing,
// empty-path, directory, oversized, non-object or invalid file is no
// manifest, so lastmod is omitted), normalizes keys, ignores non-string
// values, and parses the ISO dates strtotime reads, a date without a zone
// as UTC.
func TestManifest(t *testing.T) {
	dir := t.TempDir()
	write := func(name, body string) string {
		t.Helper()
		path := filepath.Join(dir, name)
		if err := os.WriteFile(path, []byte(body), 0o644); err != nil {
			t.Fatal(err)
		}
		return path
	}
	for name, path := range map[string]string{
		"empty path":    "",
		"spaces":        "   ",
		"missing":       filepath.Join(dir, "missing.json"),
		"directory":     dir,
		"list":          write("list.json", `["/a"]`),
		"string":        write("string.json", `"x"`),
		"invalid":       write("invalid.json", `{"/a": `),
		"empty file":    write("empty.json", ""),
		"oversized":     write("big.json", `{"/a":"2026-01-01","pad":"`+strings.Repeat("x", classes.ManifestMaxBytes)+`"}`),
		"null":          write("null.json", "null"),
		"leading space": write("space.json", "  \n"),
	} {
		if m := classes.LoadManifest(path); m != nil {
			t.Errorf("%s: manifest = %v, want none", name, m)
		}
	}
	if fifo := filepath.Join(dir, "link.json"); os.Symlink(dir, fifo) == nil {
		if m := classes.LoadManifest(fifo); m != nil {
			t.Error("a symlink to a directory is not a manifest")
		}
	}

	path := write("updates.json", `  {"blog/a/":"2026-01-02T03:04:05+02:00","/b":"2026-02-03","c":"2026-03-04 05:06:07","/":"2026-04-05T06:07","/num":12,"/bad":"yesterday","/epoch":"1970-01-01T00:00:00Z","/nested":{"x":1}}`)
	m := classes.LoadManifest(path)
	if m == nil {
		t.Fatal("valid manifest not read")
	}
	if _, ok := m["/num"]; ok {
		t.Fatal("a non-string value was kept")
	}
	for url, want := range map[string]string{
		"https://h/blog/a":  "2026-01-02T01:04:05Z",
		"https://h/blog/a/": "2026-01-02T01:04:05Z",
		"https://h/b?x=1":   "2026-02-03T00:00:00Z",
		"/c":                "2026-03-04T05:06:07Z",
		"https://h":         "2026-04-05T06:07:00Z",
		"https://h/":        "2026-04-05T06:07:00Z",
	} {
		got, ok := m.Lastmod(url)
		if !ok || got.UTC().Format(time.RFC3339) != want {
			t.Errorf("Lastmod(%s) = %v %v, want %s", url, got, ok, want)
		}
	}
	for _, url := range []string{"https://h/bad", "https://h/epoch", "https://h/unlisted", "https://h/num"} {
		if got, ok := m.Lastmod(url); ok {
			t.Errorf("Lastmod(%s) = %v, want none", url, got)
		}
	}
	var none classes.Manifest
	if _, ok := none.Lastmod("https://h/b"); ok {
		t.Fatal("a nil manifest answered")
	}
}