package web

import (
	"net/http"
	"net/http/httptest"
	"testing"
)

// These cover what a path *means*: which spelling is canonical and which redirects to it. What happens
// once a path resolves is web_test.go's business.

func TestSlashlessPathRedirectsPermanently(t *testing.T) {
	h := testHandler(t)
	rec := httptest.NewRecorder()
	h.ServeHTTP(rec, httptest.NewRequest(http.MethodGet, "/pages/about", nil))
	if rec.Code != http.StatusMovedPermanently {
		t.Fatalf("got %d, want 301", rec.Code)
	}
	if loc := rec.Header().Get("Location"); loc != "/pages/about/" {
		t.Errorf("Location = %q", loc)
	}
}

func TestDefaultLanguagePrefixRedirectsToRoot(t *testing.T) {
	h := multilingualHandler(t)
	for path, want := range map[string]string{
		"/en/pages/about/": "/pages/about/",
		"/en/pages/about":  "/pages/about/",
	} {
		rec := httptest.NewRecorder()
		h.ServeHTTP(rec, httptest.NewRequest(http.MethodGet, path, nil))
		if rec.Code != http.StatusMovedPermanently {
			t.Errorf("GET %s = %d, want 301: /en/… must never be live (ADR-0009)", path, rec.Code)
			continue
		}
		if loc := rec.Header().Get("Location"); loc != want {
			t.Errorf("GET %s → %q, want %q", path, loc, want)
		}
	}
}

func TestPrefixedSlashlessPathRedirectsWithItsPrefix(t *testing.T) {
	h := multilingualHandler(t)
	rec := httptest.NewRecorder()
	h.ServeHTTP(rec, httptest.NewRequest(http.MethodGet, "/bn/pages/about", nil))
	if rec.Code != http.StatusMovedPermanently {
		t.Fatalf("got %d, want 301", rec.Code)
	}
	if loc := rec.Header().Get("Location"); loc != "/bn/pages/about/" {
		t.Errorf("Location = %q, want /bn/pages/about/", loc)
	}
}

func TestUnknownLanguagePrefixIsNotALanguage(t *testing.T) {
	h := multilingualHandler(t)
	rec := httptest.NewRecorder()
	h.ServeHTTP(rec, httptest.NewRequest(http.MethodGet, "/fr/pages/about/", nil))
	if rec.Code != http.StatusNotFound {
		t.Errorf("got %d, want 404: fr is not a language this site has", rec.Code)
	}
}

func TestPageOneIsNeverItsOwnURL(t *testing.T) {
	h := listingHandler(t, 3)
	rec := httptest.NewRecorder()
	h.ServeHTTP(rec, httptest.NewRequest(http.MethodGet, "/posts/page/1/", nil))
	if rec.Code != http.StatusMovedPermanently {
		t.Fatalf("got %d, want 301 (ADR-0028)", rec.Code)
	}
	if loc := rec.Header().Get("Location"); loc != "/posts/" {
		t.Errorf("Location = %q, want /posts/", loc)
	}
}

func TestTagPathsCanonicaliseAndMiss(t *testing.T) {
	h := tagHandler(t)
	rec := httptest.NewRecorder()
	h.ServeHTTP(rec, httptest.NewRequest(http.MethodGet, "/tags/monsoon", nil))
	if rec.Code != http.StatusMovedPermanently || rec.Header().Get("Location") != "/tags/monsoon/" {
		t.Errorf("slashless tag path = %d %q", rec.Code, rec.Header().Get("Location"))
	}
	for _, path := range []string{"/tags/nothing/", "/tags/", "/posts/tags/nothing/"} {
		rec := httptest.NewRecorder()
		h.ServeHTTP(rec, httptest.NewRequest(http.MethodGet, path, nil))
		if rec.Code != http.StatusNotFound {
			t.Errorf("GET %s = %d, want 404", path, rec.Code)
		}
	}
}