package pages

import (
	"context"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	"github.com/gin-gonic/gin"

	"armature/config"
	"armature/store"
)

// ── mock PackageStore ────────────────────────────────────────

// mockPackageStore implements store.PackageStore with in-memory data.
// Only Get and List are wired; everything else is a no-op stub.
type mockPackageStore struct {
	pkgs map[string]*store.PackageRegistration
}

func newMockPackageStore(pkgs ...*store.PackageRegistration) *mockPackageStore {
	m := &mockPackageStore{pkgs: make(map[string]*store.PackageRegistration)}
	for _, p := range pkgs {
		m.pkgs[p.ID] = p
	}
	return m
}

func (m *mockPackageStore) Get(_ context.Context, id string) (*store.PackageRegistration, error) {
	if p, ok := m.pkgs[id]; ok {
		return p, nil
	}
	return nil, nil
}

func (m *mockPackageStore) List(_ context.Context) ([]store.PackageRegistration, error) {
	var out []store.PackageRegistration
	for _, p := range m.pkgs {
		out = append(out, *p)
	}
	return out, nil
}

func (m *mockPackageStore) ListEnabled(_ context.Context) ([]string, error) {
	var ids []string
	for id, p := range m.pkgs {
		if p.Enabled {
			ids = append(ids, id)
		}
	}
	return ids, nil
}

// Stubs — not exercised by the pages handler tests.
func (m *mockPackageStore) Seed(context.Context, string, string, string, map[string]any) error { return nil }
func (m *mockPackageStore) SetEnabled(context.Context, string, bool) error       { return nil }
func (m *mockPackageStore) SetStatus(context.Context, string, string) error      { return nil }
func (m *mockPackageStore) Delete(context.Context, string) error                 { return nil }
func (m *mockPackageStore) Create(context.Context, *store.PackageRegistration) error { return nil }
func (m *mockPackageStore) Update(context.Context, string, *store.PackageRegistration) error { return nil }
func (m *mockPackageStore) ListByType(context.Context, string) ([]store.PackageRegistration, error) { return nil, nil }
func (m *mockPackageStore) ListEnabledByType(context.Context, string) ([]store.PackageRegistration, error) { return nil, nil }
func (m *mockPackageStore) ListForUser(context.Context, string) ([]store.UserPackage, error) { return nil, nil }
func (m *mockPackageStore) GetUserSettings(context.Context, string, string) (*store.PackageUserSettings, error) { return nil, nil }
func (m *mockPackageStore) SetUserSettings(context.Context, *store.PackageUserSettings) error { return nil }
func (m *mockPackageStore) DeleteUserSettings(context.Context, string, string) error { return nil }
func (m *mockPackageStore) ListVisiblePackages(context.Context, string) ([]store.PackageRegistration, error) { return nil, nil }
func (m *mockPackageStore) SetSchemaVersion(context.Context, string, int) error { return nil }
func (m *mockPackageStore) GetPackageSettings(context.Context, string) (json.RawMessage, error) { return nil, nil }
func (m *mockPackageStore) SetPackageSettings(context.Context, string, json.RawMessage) error { return nil }
func (m *mockPackageStore) GetTeamSettings(context.Context, string, string) (json.RawMessage, error) { return nil, nil }
func (m *mockPackageStore) SetTeamSettings(context.Context, string, string, json.RawMessage) error { return nil }
func (m *mockPackageStore) DeleteTeamSettings(context.Context, string, string) error { return nil }
func (m *mockPackageStore) ListAdoptable(context.Context) ([]store.PackageRegistration, error) { return nil, nil }
func (m *mockPackageStore) GetByAdoptedFrom(context.Context, string, string) (*store.PackageRegistration, error) { return nil, nil }

// ── test helpers ─────────────────────────────────────────────

// testEngine creates a minimal Engine with parsed templates and mock stores.
func testEngine(t *testing.T, pkgs ...*store.PackageRegistration) *Engine {
	t.Helper()
	gin.SetMode(gin.TestMode)
	e := &Engine{
		cfg:     &config.Config{BasePath: ""},
		stores:  store.Stores{Packages: newMockPackageStore(pkgs...)},
		loaders: make(map[string]DataLoaderFunc),
	}
	e.parseTemplates()
	e.registerCoreSurfaces()
	return e
}

// testRouter builds a Gin router with extension routes registered.
func testRouter(t *testing.T, pkgs ...*store.PackageRegistration) *gin.Engine {
	t.Helper()
	engine := testEngine(t, pkgs...)
	r := gin.New()

	// OptionalAuth — set user_id if "X-User-ID" header is present (test shortcut)
	optAuth := func(c *gin.Context) {
		if uid := c.GetHeader("X-User-ID"); uid != "" {
			c.Set("user_id", uid)
			c.Set("role", "user")
		}
		c.Next()
	}

	// API auth — for ext API sub-paths (not exercised in surface tests)
	apiAuth := func(c *gin.Context) { c.Next() }

	// Ext API handler stub
	apiHandler := func(c *gin.Context) { c.JSON(200, gin.H{"ok": true}) }

	engine.RegisterExtensionRoutes(r.Group(""), optAuth, apiAuth, apiHandler)
	return r
}

func doGet(r *gin.Engine, path string, headers ...string) *httptest.ResponseRecorder {
	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", path, nil)
	for i := 0; i+1 < len(headers); i += 2 {
		req.Header.Set(headers[i], headers[i+1])
	}
	r.ServeHTTP(w, req)
	return w
}

// ── handler integration tests ───────────────────────────────

func TestHandler_RootPathRefresh(t *testing.T) {
	pkg := &store.PackageRegistration{
		ID: "test-pkg", Title: "Test", Type: "surface", Source: "extension",
		Enabled: true, Status: "active",
		Manifest: map[string]any{
			"surfaces": []any{
				map[string]any{"path": "/", "access": "authenticated", "title": "Dashboard"},
			},
		},
	}
	r := testRouter(t, pkg)
	w := doGet(r, "/s/test-pkg", "X-User-ID", "user-1")
	if w.Code != http.StatusOK {
		t.Errorf("expected 200, got %d", w.Code)
	}
}

func TestHandler_SubPathStaticRefresh(t *testing.T) {
	pkg := &store.PackageRegistration{
		ID: "test-pkg", Title: "Test", Type: "surface", Source: "extension",
		Enabled: true, Status: "active",
		Manifest: map[string]any{
			"surfaces": []any{
				map[string]any{"path": "/", "access": "authenticated", "title": "Dashboard"},
				map[string]any{"path": "/monitor", "access": "authenticated", "title": "Monitor"},
			},
		},
	}
	r := testRouter(t, pkg)
	w := doGet(r, "/s/test-pkg/monitor", "X-User-ID", "user-1")
	if w.Code != http.StatusOK {
		t.Errorf("expected 200, got %d", w.Code)
	}
}

func TestHandler_SubPathParamRefresh(t *testing.T) {
	pkg := &store.PackageRegistration{
		ID: "test-pkg", Title: "Test", Type: "surface", Source: "extension",
		Enabled: true, Status: "active",
		Manifest: map[string]any{
			"surfaces": []any{
				map[string]any{"path": "/", "access": "authenticated", "title": "Dashboard"},
				map[string]any{"path": "/:id", "access": "authenticated", "title": "Detail"},
			},
		},
	}
	r := testRouter(t, pkg)
	w := doGet(r, "/s/test-pkg/abc123", "X-User-ID", "user-1")
	if w.Code != http.StatusOK {
		t.Errorf("expected 200, got %d", w.Code)
	}
	body := w.Body.String()
	if !strings.Contains(body, `"id":"abc123"`) {
		t.Errorf("expected __SURFACE_PARAMS__ to contain id=abc123")
	}
}

func TestHandler_UnauthRedirect(t *testing.T) {
	pkg := &store.PackageRegistration{
		ID: "test-pkg", Title: "Test", Type: "surface", Source: "extension",
		Enabled: true, Status: "active",
		Manifest: map[string]any{
			"surfaces": []any{
				map[string]any{"path": "/dashboard", "access": "authenticated", "title": "Dashboard"},
			},
		},
	}
	r := testRouter(t, pkg)
	w := doGet(r, "/s/test-pkg/dashboard") // no auth header
	if w.Code != http.StatusTemporaryRedirect {
		t.Errorf("expected 307, got %d", w.Code)
	}
	loc := w.Header().Get("Location")
	if !strings.Contains(loc, "/login") {
		t.Errorf("expected redirect to /login, got %s", loc)
	}
}

func TestHandler_PublicSurfaceAnonymous(t *testing.T) {
	pkg := &store.PackageRegistration{
		ID: "test-pkg", Title: "Test", Type: "surface", Source: "extension",
		Enabled: true, Status: "active",
		Manifest: map[string]any{
			"surfaces": []any{
				map[string]any{"path": "/submit", "access": "public", "title": "Submit"},
			},
		},
	}
	r := testRouter(t, pkg)
	w := doGet(r, "/s/test-pkg/submit") // no auth
	if w.Code != http.StatusOK {
		t.Errorf("expected 200 for public surface, got %d", w.Code)
	}
}

func TestHandler_MixedAccessPackage(t *testing.T) {
	pkg := &store.PackageRegistration{
		ID: "test-pkg", Title: "Test", Type: "surface", Source: "extension",
		Enabled: true, Status: "active",
		Manifest: map[string]any{
			"surfaces": []any{
				map[string]any{"path": "/submit", "access": "public", "title": "Submit"},
				map[string]any{"path": "/dashboard", "access": "authenticated", "title": "Dashboard"},
			},
		},
	}
	r := testRouter(t, pkg)

	// Public surface — anonymous OK
	w1 := doGet(r, "/s/test-pkg/submit")
	if w1.Code != http.StatusOK {
		t.Errorf("public surface: expected 200, got %d", w1.Code)
	}

	// Authenticated surface — anonymous gets redirect
	w2 := doGet(r, "/s/test-pkg/dashboard")
	if w2.Code != http.StatusTemporaryRedirect {
		t.Errorf("auth surface: expected 307, got %d", w2.Code)
	}
}

func TestHandler_NonMatchingSubPath(t *testing.T) {
	pkg := &store.PackageRegistration{
		ID: "test-pkg", Title: "Test", Type: "surface", Source: "extension",
		Enabled: true, Status: "active",
		Manifest: map[string]any{
			"surfaces": []any{
				map[string]any{"path": "/", "access": "authenticated", "title": "Dashboard"},
			},
		},
	}
	r := testRouter(t, pkg)
	w := doGet(r, "/s/test-pkg/nonexistent", "X-User-ID", "user-1")
	if w.Code != http.StatusNotFound {
		t.Errorf("expected 404, got %d", w.Code)
	}
}

func TestHandler_EarlyAuthShortCircuit(t *testing.T) {
	// All surfaces require auth → early short-circuit before surface matching
	pkg := &store.PackageRegistration{
		ID: "test-pkg", Title: "Test", Type: "surface", Source: "extension",
		Enabled: true, Status: "active",
		Manifest: map[string]any{
			"surfaces": []any{
				map[string]any{"path": "/", "access": "authenticated", "title": "Dashboard"},
				map[string]any{"path": "/settings", "access": "admin", "title": "Settings"},
			},
		},
	}
	r := testRouter(t, pkg)

	// Any path — should redirect before even matching surfaces
	w := doGet(r, "/s/test-pkg/anything") // no auth
	if w.Code != http.StatusTemporaryRedirect {
		t.Errorf("expected 307 (early short-circuit), got %d", w.Code)
	}
	loc := w.Header().Get("Location")
	if !strings.Contains(loc, "/login") {
		t.Errorf("expected redirect to /login, got %s", loc)
	}
}