package auth

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

	"github.com/google/uuid"
)

func TestContextFromTrustedHeaders(t *testing.T) {
	adminID := uuid.New()
	pubID := uuid.New()

	h := http.Header{}
	h.Set(HeaderVerifiedUserID, adminID.String())
	h.Set(HeaderVerifiedRole, "superadmin")
	h.Set(HeaderVerifiedEmail, "admin@example.com")
	h.Set(HeaderVerifiedPublicUserID, pubID.String())
	h.Set(HeaderVerifiedPublicUsername, "ninja")
	h.Set(HeaderVerifiedPublicEmail, "ninja@example.com")

	ctx := ContextFromTrustedHeaders(context.Background(), h)

	c, ok := GetUserFromContext(ctx)
	if !ok {
		t.Fatal("admin claims missing")
	}
	if c.UserID != adminID || c.Role != "superadmin" || c.Email != "admin@example.com" {
		t.Fatalf("admin claims mismatch: %+v", c)
	}
	p, ok := GetPublicUserFromContext(ctx)
	if !ok {
		t.Fatal("public claims missing")
	}
	if p.UserID != pubID || p.Username != "ninja" || p.Email != "ninja@example.com" {
		t.Fatalf("public claims mismatch: %+v", p)
	}
}

// TestContextFromTrustedHeaders_NoneWhenAbsent proves an anonymous request (no
// trusted headers) yields no principals — nothing is fabricated.
func TestContextFromTrustedHeaders_NoneWhenAbsent(t *testing.T) {
	ctx := ContextFromTrustedHeaders(context.Background(), http.Header{})
	if _, ok := GetUserFromContext(ctx); ok {
		t.Fatal("unexpected admin claims for anonymous request")
	}
	if _, ok := GetPublicUserFromContext(ctx); ok {
		t.Fatal("unexpected public claims for anonymous request")
	}
}

// TestContextFromTrustedHeaders_BadUUIDIgnored proves a malformed id header is
// ignored rather than trusted (no panic, no principal).
func TestContextFromTrustedHeaders_BadUUIDIgnored(t *testing.T) {
	h := http.Header{}
	h.Set(HeaderVerifiedUserID, "not-a-uuid")
	h.Set(HeaderVerifiedRole, "superadmin")
	ctx := ContextFromTrustedHeaders(context.Background(), h)
	if _, ok := GetUserFromContext(ctx); ok {
		t.Fatal("malformed user-id header must not yield a principal")
	}
}

// TestTrustedHeaderMiddleware proves the middleware installs the principal into
// the downstream handler's request context, keyed by the canonical header form.
func TestTrustedHeaderMiddleware(t *testing.T) {
	adminID := uuid.New()
	var got *Claims
	next := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		got, _ = GetUserFromContext(r.Context())
	})
	req := httptest.NewRequest(http.MethodGet, "/x", nil)
	// lower-case on the way in — net/http canonicalizes, middleware must still see it.
	req.Header.Set("x-bn-verified-user-id", adminID.String())
	req.Header.Set("x-bn-verified-role", "admin")
	TrustedHeaderMiddleware(next).ServeHTTP(httptest.NewRecorder(), req)
	if got == nil || got.UserID != adminID || got.Role != "admin" {
		t.Fatalf("middleware did not install principal: %+v", got)
	}
}