package handlers

import (
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
	"time"

	"task-dashboard/internal/models"
)

func TestWidgetAuthMiddleware_NoToken(t *testing.T) {
	called := false
	inner := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { called = true })
	h := WidgetAuthMiddleware("secret", inner)

	req := httptest.NewRequest("GET", "/api/widget", nil)
	w := httptest.NewRecorder()
	h.ServeHTTP(w, req)

	if w.Code != http.StatusUnauthorized {
		t.Fatalf("expected 401, got %d", w.Code)
	}
	if called {
		t.Fatal("inner handler should not have been called")
	}
}

func TestWidgetAuthMiddleware_WrongToken(t *testing.T) {
	inner := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {})
	h := WidgetAuthMiddleware("secret", inner)

	req := httptest.NewRequest("GET", "/api/widget", nil)
	req.Header.Set("Authorization", "Bearer wrong")
	w := httptest.NewRecorder()
	h.ServeHTTP(w, req)

	if w.Code != http.StatusUnauthorized {
		t.Fatalf("expected 401, got %d", w.Code)
	}
}

func TestWidgetAuthMiddleware_CorrectToken(t *testing.T) {
	called := false
	inner := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { called = true })
	h := WidgetAuthMiddleware("secret", inner)

	req := httptest.NewRequest("GET", "/api/widget", nil)
	req.Header.Set("Authorization", "Bearer secret")
	w := httptest.NewRecorder()
	h.ServeHTTP(w, req)

	if !called {
		t.Fatal("inner handler should have been called")
	}
}

func TestTimelineItemToWidgetItem_Task(t *testing.T) {
	now := time.Now()
	item := models.TimelineItem{
		ID:       "abc",
		Title:    "Write notes",
		Source:   "doot",
		Type:     models.TimelineItemTypeTask,
		Time:     now,
		IsAllDay: true,
		URL:      "https://example.com/task/abc",
	}

	wi := TimelineItemToWidgetItem(item)

	if wi.ID != "abc" {
		t.Errorf("ID: got %q, want %q", wi.ID, "abc")
	}
	if wi.Type != "task" {
		t.Errorf("Type: got %q, want %q", wi.Type, "task")
	}
	if !wi.Completable {
		t.Error("doot task should be completable")
	}
	if wi.Start != nil {
		t.Error("all-day item should have nil Start")
	}
}

func TestTimelineItemToWidgetItem_Event(t *testing.T) {
	start := time.Now()
	end := start.Add(time.Hour)
	item := models.TimelineItem{
		ID:      "cal1",
		Title:   "Team sync",
		Source:  "calendar",
		Type:    models.TimelineItemTypeEvent,
		Time:    start,
		EndTime: &end,
	}

	wi := TimelineItemToWidgetItem(item)

	if wi.Type != "event" {
		t.Errorf("Type: got %q, want %q", wi.Type, "event")
	}
	if wi.Completable {
		t.Error("calendar event should not be completable")
	}
	if wi.Start == nil {
		t.Error("timed event should have non-nil Start")
	}
}

// TestTimelineItemToWidgetItem_AllDayEvent proves the 2026-07-12 fix: an
// all-day CALENDAR EVENT (Type == event, IsAllDay == true) must get Start
// populated with its real date -- previously Start was nil for every
// IsAllDay item regardless of type, which meant the widget client's
// hourly-slot packer had no date information to pin all-day events to the
// top of the correct day and they could silently fall outside the visible
// grid range instead. End stays nil since there's no meaningful end time to
// show for an all-day item.
func TestTimelineItemToWidgetItem_AllDayEvent(t *testing.T) {
	day := time.Date(2026, 7, 12, 0, 0, 0, 0, time.Local)
	item := models.TimelineItem{
		ID:       "cal-holiday",
		Title:    "Company Holiday",
		Source:   "calendar",
		Type:     models.TimelineItemTypeEvent,
		Time:     day,
		IsAllDay: true,
	}

	wi := TimelineItemToWidgetItem(item)

	if wi.Type != "event" {
		t.Errorf("Type: got %q, want %q", wi.Type, "event")
	}
	if !wi.IsAllDay {
		t.Error("expected IsAllDay to be true")
	}
	if wi.Start == nil {
		t.Fatal("all-day event should have non-nil Start (needed to pin it to the correct day)")
	}
	if !wi.Start.Equal(day) {
		t.Errorf("Start = %v, want %v", *wi.Start, day)
	}
	if wi.End != nil {
		t.Error("all-day event should have nil End")
	}
}

// TestTimelineItemToWidgetItem_AllDayTask_KeepsFloatingBehavior proves the
// same fix does NOT change behavior for undated doot/gtask tasks, which are
// also flagged IsAllDay as a "no specific time" fallback (see
// TimelineItem.ComputeDaySection) but are a different concept from a real
// all-day calendar event -- they must keep the existing nil-Start
// "floating" treatment so the hourly-slot packer still places them.
func TestTimelineItemToWidgetItem_AllDayTask_KeepsFloatingBehavior(t *testing.T) {
	item := models.TimelineItem{
		ID:       "undated-task",
		Title:    "Someday task",
		Source:   "doot",
		Type:     models.TimelineItemTypeTask,
		Time:     time.Now(),
		IsAllDay: true,
	}

	wi := TimelineItemToWidgetItem(item)

	if wi.Start != nil {
		t.Error("an undated task (IsAllDay as a fallback, not a real all-day event) should still have nil Start")
	}
}

// TestTimelineItemToWidgetItem_ForwardsIsOverdue proves the 2026-07-12
// overdue-badge fix: TimelineItem.IsOverdue (already computed correctly by
// ComputeDaySection, confirmed by the earlier fix that made overdue tasks
// appear in the timeline at all) must be forwarded onto WidgetItem so the
// Android client can render it distinctly -- previously it was silently
// dropped, so an overdue task looked identical to a normal one on the
// widget.
func TestTimelineItemToWidgetItem_ForwardsIsOverdue(t *testing.T) {
	item := models.TimelineItem{
		ID:        "overdue-1",
		Title:     "Pay the water bill",
		Source:    "doot",
		Type:      models.TimelineItemTypeTask,
		Time:      time.Now(),
		IsOverdue: true,
	}

	wi := TimelineItemToWidgetItem(item)

	if !wi.IsOverdue {
		t.Error("expected IsOverdue to be forwarded as true")
	}
}

func TestTimelineItemToWidgetItem_NotOverdueByDefault(t *testing.T) {
	item := models.TimelineItem{
		ID:     "today-1",
		Title:  "Water the plants",
		Source: "doot",
		Type:   models.TimelineItemTypeTask,
		Time:   time.Now(),
	}

	wi := TimelineItemToWidgetItem(item)

	if wi.IsOverdue {
		t.Error("expected IsOverdue to be false when the source item isn't overdue")
	}
}

// TestTimelineItemToWidgetItem_DootTaskGetsDueDate proves the 2026-07-12
// clickable-reschedule fix: a doot task's raw due date must reach the
// client via a NEW field (DueDate) that is independent of Start/IsAllDay --
// Start is deliberately left nil for doot tasks (see
// TestTimelineItemToWidgetItem_AllDayTask_KeepsFloatingBehavior) so the
// client's floating-task SlotPacker can position it, and that must keep
// working unchanged. Before this fix there was no way for the Android
// detail popup to know a doot task's current due date at all.
func TestTimelineItemToWidgetItem_DootTaskGetsDueDate(t *testing.T) {
	due := time.Date(2026, 7, 15, 0, 0, 0, 0, time.Local)
	item := models.TimelineItem{
		ID:       "doot-1",
		Title:    "Pay the water bill",
		Source:   "doot",
		Type:     models.TimelineItemTypeTask,
		Time:     due,
		IsAllDay: true,
	}

	wi := TimelineItemToWidgetItem(item)

	if wi.DueDate == nil {
		t.Fatal("expected DueDate to be set for a doot task with a real due date")
	}
	if !wi.DueDate.Equal(due) {
		t.Errorf("DueDate = %v, want %v", *wi.DueDate, due)
	}
	// Start must stay nil -- this is the pre-existing floating-task
	// behavior and this feature must not change it.
	if wi.Start != nil {
		t.Error("Start must remain nil for a doot task -- DueDate is a separate field, not a replacement")
	}
}

func TestTimelineItemToWidgetItem_UndatedDootTask_NilDueDate(t *testing.T) {
	item := models.TimelineItem{
		ID:       "doot-undated",
		Title:    "Someday task",
		Source:   "doot",
		Type:     models.TimelineItemTypeTask,
		Time:     time.Now(),
		IsAllDay: true,
	}
	// Zero Time simulates the "no real due date" case at the field level;
	// TimelineItemToWidgetItem's DueDate logic must guard on !Time.IsZero().
	item.Time = time.Time{}

	wi := TimelineItemToWidgetItem(item)

	if wi.DueDate != nil {
		t.Error("expected DueDate to be nil when the source item has a zero Time")
	}
}

func TestTimelineItemToWidgetItem_CalendarEvent_NilDueDate(t *testing.T) {
	start := time.Now()
	item := models.TimelineItem{
		ID:     "cal-1",
		Title:  "Team sync",
		Source: "calendar",
		Type:   models.TimelineItemTypeEvent,
		Time:   start,
	}

	wi := TimelineItemToWidgetItem(item)

	if wi.DueDate != nil {
		t.Error("expected DueDate to stay nil for a non-doot item (calendar event)")
	}
}

func TestHandleWidgetComplete_NonCompletable(t *testing.T) {
	h := &Handler{}
	body := `{"id":"x","source":"calendar"}`
	req := httptest.NewRequest("POST", "/api/widget/complete", strings.NewReader(body))
	w := httptest.NewRecorder()
	http.HandlerFunc(h.HandleWidgetComplete).ServeHTTP(w, req)

	if w.Code != http.StatusBadRequest {
		t.Fatalf("expected 400, got %d", w.Code)
	}
}

// TestHandleWidgetComplete_UnknownID_Returns404 proves the 2026-07-12 fix at
// the handler layer: a "doot" completion for an id that doesn't exist must
// surface as 404, not the previous silent 200 (see
// store.ErrNativeTaskNotFound's doc comment for the underlying bug this
// closes -- a real production incident where the widget's completeTask tap
// intermittently looked like it worked but changed nothing).
func TestHandleWidgetComplete_UnknownID_Returns404(t *testing.T) {
	s, cleanup := setupTestDB(t)
	defer cleanup()
	h := &Handler{store: s}
	body := `{"id":"does-not-exist","source":"doot"}`
	req := httptest.NewRequest("POST", "/api/widget/complete", strings.NewReader(body))
	w := httptest.NewRecorder()
	http.HandlerFunc(h.HandleWidgetComplete).ServeHTTP(w, req)

	if w.Code != http.StatusNotFound {
		t.Fatalf("expected 404, got %d", w.Code)
	}
}

// TestHandleWidgetAdd_CreatesTask proves the quick-add feature: POSTing a
// title to /api/widget/add creates an undated native task the same way the
// web UI's HandleUnifiedAdd does, but via the widget's bearer-token JSON
// API instead of a session-authenticated HTML form.
func TestHandleWidgetAdd_CreatesTask(t *testing.T) {
	s, cleanup := setupTestDB(t)
	defer cleanup()
	h := &Handler{store: s}
	body := `{"title":"Buy milk"}`
	req := httptest.NewRequest("POST", "/api/widget/add", strings.NewReader(body))
	w := httptest.NewRecorder()
	http.HandlerFunc(h.HandleWidgetAdd).ServeHTTP(w, req)

	if w.Code != http.StatusOK {
		t.Fatalf("expected 200, got %d", w.Code)
	}

	tasks, err := s.GetUndatedNativeTasks()
	if err != nil {
		t.Fatalf("failed to read back tasks: %v", err)
	}
	found := false
	for _, task := range tasks {
		if task.Content == "Buy milk" {
			found = true
		}
	}
	if !found {
		t.Error("expected a task with content 'Buy milk' to have been created")
	}
}

func TestHandleWidgetAdd_EmptyTitle_Returns400(t *testing.T) {
	s, cleanup := setupTestDB(t)
	defer cleanup()
	h := &Handler{store: s}
	body := `{"title":""}`
	req := httptest.NewRequest("POST", "/api/widget/add", strings.NewReader(body))
	w := httptest.NewRecorder()
	http.HandlerFunc(h.HandleWidgetAdd).ServeHTTP(w, req)

	if w.Code != http.StatusBadRequest {
		t.Fatalf("expected 400, got %d", w.Code)
	}
}

func TestHandleWidgetAdd_WhitespaceOnlyTitle_Returns400(t *testing.T) {
	s, cleanup := setupTestDB(t)
	defer cleanup()
	h := &Handler{store: s}
	body := `{"title":"   "}`
	req := httptest.NewRequest("POST", "/api/widget/add", strings.NewReader(body))
	w := httptest.NewRecorder()
	http.HandlerFunc(h.HandleWidgetAdd).ServeHTTP(w, req)

	if w.Code != http.StatusBadRequest {
		t.Fatalf("expected 400, got %d", w.Code)
	}
}

func TestWidgetAuthMiddleware_EmptyToken(t *testing.T) {
	inner := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {})
	h := WidgetAuthMiddleware("", inner)

	req := httptest.NewRequest("GET", "/api/widget", nil)
	req.Header.Set("Authorization", "Bearer ")
	w := httptest.NewRecorder()
	h.ServeHTTP(w, req)

	if w.Code != http.StatusUnauthorized {
		t.Fatalf("expected 401 with empty token, got %d", w.Code)
	}
}