package http

import (
	"context"
	stdhttp "net/http"
	"net/http/httptest"
	"path/filepath"
	"strings"
	"testing"
	"time"

	"gitea.dcglab.co.uk/steve/restic-manager/internal/crypto"
	"gitea.dcglab.co.uk/steve/restic-manager/internal/server/config"
	"gitea.dcglab.co.uk/steve/restic-manager/internal/server/oidc"
	"gitea.dcglab.co.uk/steve/restic-manager/internal/server/oidc/oidctest"
	"gitea.dcglab.co.uk/steve/restic-manager/internal/store"
)

// newTestServerWithOIDC returns a Server wired to a stub IdP.
// Returned ts is the httptest.Server fronting the actual server;
// stub is the IdP for minting codes / configuring claims.
func newTestServerWithOIDC(t *testing.T) (*Server, *httptest.Server, *oidctest.StubIdP) {
	t.Helper()
	dir := t.TempDir()
	st, err := store.Open(context.Background(), filepath.Join(dir, "rm.db"))
	if err != nil {
		t.Fatalf("store: %v", err)
	}
	t.Cleanup(func() { _ = st.Close() })

	keyPath := filepath.Join(dir, "secret.key")
	if err := crypto.GenerateKeyFile(keyPath); err != nil {
		t.Fatalf("genkey: %v", err)
	}
	key, _ := crypto.LoadKeyFromFile(keyPath)
	aead, _ := crypto.NewAEAD(key)

	stub := oidctest.New(t)
	cfg := &config.OIDCConfig{
		Issuer: stub.URL(), ClientID: "test-client", ClientSecret: "x",
		Scopes: []string{"openid"}, RoleClaim: "groups",
		RoleMapping: map[string]string{
			"rm-admins":    "admin",
			"rm-operators": "operator",
			"rm-viewers":   "viewer",
		},
	}
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	oidcClient, err := oidc.New(ctx, cfg, "http://test")
	if err != nil {
		t.Fatalf("oidc client: %v", err)
	}

	deps := Deps{
		Cfg:   config.Config{Listen: ":0", DataDir: dir, SecretKeyFile: keyPath, BaseURL: "http://test"},
		Store: st,
		AEAD:  aead,
		OIDC:  oidcClient,
	}
	s := New(deps)
	ts := httptest.NewServer(s.srv.Handler)
	t.Cleanup(ts.Close)
	return s, ts, stub
}

func TestOIDCLoginRedirectsToIdP(t *testing.T) {
	t.Parallel()
	srv, ts, _ := newTestServerWithOIDC(t)
	c := &stdhttp.Client{CheckRedirect: func(*stdhttp.Request, []*stdhttp.Request) error {
		return stdhttp.ErrUseLastResponse
	}}
	res, err := c.Get(ts.URL + "/auth/oidc/login")
	if err != nil {
		t.Fatalf("get: %v", err)
	}
	defer res.Body.Close()
	if res.StatusCode != stdhttp.StatusSeeOther {
		t.Errorf("status: got %d want 303", res.StatusCode)
	}
	loc := res.Header.Get("Location")
	if !strings.Contains(loc, "code_challenge=") || !strings.Contains(loc, "state=") {
		t.Errorf("location: %q", loc)
	}
	_ = srv
}