package app

import (
	"net/http"
	"net/http/httptest"
	"net/url"
	"path/filepath"
	"regexp"
	"strings"
	"testing"
)

func TestLoginAttendanceAndReportFlow(t *testing.T) {
	s, err := New(Config{
		Addr:         ":0",
		BaseURL:      "http://example.test",
		DatabasePath: filepath.Join(t.TempDir(), "test.db"),
	})
	if err != nil {
		t.Fatal(err)
	}
	defer s.Close()

	login := formRequest(t, s.http.Handler, "/login", url.Values{
		"username": {"admin"},
		"password": {"admin123"},
	}, nil)
	if login.Code != http.StatusSeeOther {
		t.Fatalf("login status: got %d, body %s", login.Code, login.Body.String())
	}
	cookies := login.Result().Cookies()
	if len(cookies) == 0 {
		t.Fatal("login did not set a session cookie")
	}
	session := cookies[0]

	dashboardReq := httptest.NewRequest(http.MethodGet, "/", nil)
	dashboardReq.AddCookie(session)
	dashboard := httptest.NewRecorder()
	s.http.Handler.ServeHTTP(dashboard, dashboardReq)
	if dashboard.Code != http.StatusOK || !strings.Contains(dashboard.Body.String(), "PERSIAN CALENDAR") {
		t.Fatalf("dashboard status/body: %d %s", dashboard.Code, dashboard.Body.String())
	}
	if !strings.Contains(dashboard.Body.String(), "/day?date=") {
		t.Fatal("dashboard calendar days do not link to the team day view")
	}
	csrf := extractCSRF(t, dashboard.Body.String())

	createUser := formRequest(t, s.http.Handler, "/admin/users", url.Values{
		"csrf":         {csrf},
		"username":     {"sara"},
		"password":     {"temporary-password"},
		"display_name": {"Sara Ahmadi"},
		"email":        {"sara@example.test"},
		"role":         {"member"},
	}, session)
	if createUser.Code != http.StatusSeeOther {
		t.Fatalf("create user status: got %d, body %s", createUser.Code, createUser.Body.String())
	}
	if _, err := s.store.Authenticate("sara", "temporary-password"); err != nil {
		t.Fatalf("created teammate could not authenticate: %v", err)
	}

	checkIn := formRequest(t, s.http.Handler, "/attendance/check-in", url.Values{
		"csrf": {csrf},
		"mode": {"office"},
	}, session)
	if checkIn.Code != http.StatusSeeOther {
		t.Fatalf("check-in status: got %d, body %s", checkIn.Code, checkIn.Body.String())
	}

	reportReq := httptest.NewRequest(http.MethodGet, "/reports/attendance.csv?start=2020-01-01&end=2030-01-01", nil)
	reportReq.AddCookie(session)
	report := httptest.NewRecorder()
	s.http.Handler.ServeHTTP(report, reportReq)
	if report.Code != http.StatusOK {
		t.Fatalf("report status: got %d, body %s", report.Code, report.Body.String())
	}
	if got := report.Header().Get("Content-Type"); !strings.Contains(got, "text/csv") {
		t.Fatalf("report content type: %s", got)
	}
	if !strings.Contains(report.Body.String(), "Workspace Admin") {
		t.Fatalf("report did not contain attendance row: %s", report.Body.String())
	}
}

func TestPersianRequestDateParsing(t *testing.T) {
	got, ok := parseUserDate("1405-05-06")
	if !ok || got != "2026-07-28" {
		t.Fatalf("got %q, %v; want 2026-07-28, true", got, ok)
	}
	if _, ok := parseUserDate("1400-12-30"); ok {
		t.Fatal("accepted an invalid non-leap Esfand date")
	}
}

func TestReviewedRequestCanBeListed(t *testing.T) {
	s, err := New(Config{
		Addr:         ":0",
		BaseURL:      "http://example.test",
		DatabasePath: filepath.Join(t.TempDir(), "review.db"),
	})
	if err != nil {
		t.Fatal(err)
	}
	defer s.Close()

	if err := s.store.CreateRequest(1, "leave", "2026-07-28", "2026-07-29", "Personal"); err != nil {
		t.Fatal(err)
	}
	pending, err := s.store.Requests(1, true, "pending")
	if err != nil || len(pending) != 1 {
		t.Fatalf("pending requests: %#v, %v", pending, err)
	}
	if err := s.store.ReviewRequest(t.Context(), pending[0].ID, 1, "approved", "Approved"); err != nil {
		t.Fatal(err)
	}
	reviewed, err := s.store.Requests(1, true, "")
	if err != nil {
		t.Fatalf("listing reviewed request failed: %v", err)
	}
	if len(reviewed) != 1 || reviewed[0].Status != "approved" {
		t.Fatalf("unexpected reviewed requests: %#v", reviewed)
	}

	token, _, err := s.store.CreateSession(1)
	if err != nil {
		t.Fatal(err)
	}
	adminRequest := httptest.NewRequest(http.MethodGet, "/admin/requests?flash=Request+reviewed", nil)
	adminRequest.AddCookie(&http.Cookie{Name: "teammate_session", Value: token})
	adminResponse := httptest.NewRecorder()
	s.http.Handler.ServeHTTP(adminResponse, adminRequest)
	if adminResponse.Code != http.StatusOK || !strings.Contains(adminResponse.Body.String(), "Request reviewed") {
		t.Fatalf("review redirect page: got %d, body %s", adminResponse.Code, adminResponse.Body.String())
	}
}

func TestPublicRegistrationAndIdentifierLogin(t *testing.T) {
	s, err := New(Config{
		Addr:         ":0",
		BaseURL:      "http://example.test",
		DatabasePath: filepath.Join(t.TempDir(), "registration.db"),
	})
	if err != nil {
		t.Fatal(err)
	}
	defer s.Close()

	healthRequest := httptest.NewRequest(http.MethodGet, "/healthz", nil)
	healthResponse := httptest.NewRecorder()
	s.http.Handler.ServeHTTP(healthResponse, healthRequest)
	if healthResponse.Code != http.StatusOK || healthResponse.Body.String() != `{"status":"ok"}` {
		t.Fatalf("health endpoint: got %d, body %s", healthResponse.Code, healthResponse.Body.String())
	}

	registerPage := httptest.NewRequest(http.MethodGet, "/register", nil)
	registerView := httptest.NewRecorder()
	s.http.Handler.ServeHTTP(registerView, registerPage)
	if registerView.Code != http.StatusOK || !strings.Contains(registerView.Body.String(), "Create your account") {
		t.Fatalf("register page: got %d, body %s", registerView.Code, registerView.Body.String())
	}
	for _, expected := range []string{"Vazirmatn-font-face.css", "/static/theme.js", "data-theme-toggle"} {
		if !strings.Contains(registerView.Body.String(), expected) {
			t.Fatalf("register page does not include %q", expected)
		}
	}

	themeRequest := httptest.NewRequest(http.MethodGet, "/static/theme.js", nil)
	themeResponse := httptest.NewRecorder()
	s.http.Handler.ServeHTTP(themeResponse, themeRequest)
	if themeResponse.Code != http.StatusOK || !strings.Contains(themeResponse.Body.String(), "hamkar-theme") {
		t.Fatalf("theme asset: got %d, body %s", themeResponse.Code, themeResponse.Body.String())
	}

	register := formRequest(t, s.http.Handler, "/register", url.Values{
		"display_name":     {"Neda Karimi"},
		"email":            {"neda@example.test"},
		"password":         {"secure-password"},
		"password_confirm": {"secure-password"},
	}, nil)
	if register.Code != http.StatusSeeOther || register.Header().Get("Location") != "/?flash=Welcome+to+Hamkar" {
		t.Fatalf("registration: got %d location %q body %s", register.Code, register.Header().Get("Location"), register.Body.String())
	}
	if len(register.Result().Cookies()) == 0 {
		t.Fatal("registration did not sign the new member in")
	}

	user, err := s.store.Authenticate("neda@example.test", "secure-password")
	if err != nil {
		t.Fatalf("email login failed: %v", err)
	}
	if user.Username != "neda" || user.Role != "member" {
		t.Fatalf("unexpected registered user: %#v", user)
	}
	if _, err := s.store.Authenticate("neda", "secure-password"); err != nil {
		t.Fatalf("generated username login failed: %v", err)
	}
}

func TestRequestPageIncludesJalaliPicker(t *testing.T) {
	s, err := New(Config{
		Addr:         ":0",
		BaseURL:      "http://example.test",
		DatabasePath: filepath.Join(t.TempDir(), "picker.db"),
	})
	if err != nil {
		t.Fatal(err)
	}
	defer s.Close()

	token, _, err := s.store.CreateSession(1)
	if err != nil {
		t.Fatal(err)
	}
	pageRequest := httptest.NewRequest(http.MethodGet, "/requests", nil)
	pageRequest.AddCookie(&http.Cookie{Name: "teammate_session", Value: token})
	pageResponse := httptest.NewRecorder()
	s.http.Handler.ServeHTTP(pageResponse, pageRequest)
	if pageResponse.Code != http.StatusOK {
		t.Fatalf("request page status: %d", pageResponse.Code)
	}
	for _, expected := range []string{"/static/jalali-picker.js", "data-jalali-picker", "jalali-trigger"} {
		if !strings.Contains(pageResponse.Body.String(), expected) {
			t.Fatalf("request page does not include %q", expected)
		}
	}

	assetRequest := httptest.NewRequest(http.MethodGet, "/static/jalali-picker.js", nil)
	assetResponse := httptest.NewRecorder()
	s.http.Handler.ServeHTTP(assetResponse, assetRequest)
	if assetResponse.Code != http.StatusOK || !strings.Contains(assetResponse.Body.String(), "gregorianToJalali") {
		t.Fatalf("picker asset: got %d, body %s", assetResponse.Code, assetResponse.Body.String())
	}
}

func TestTeamDayShowsPresentRemoteAndAbsent(t *testing.T) {
	s, err := New(Config{
		Addr:         ":0",
		BaseURL:      "http://example.test",
		DatabasePath: filepath.Join(t.TempDir(), "day.db"),
	})
	if err != nil {
		t.Fatal(err)
	}
	defer s.Close()

	remoteID, err := s.store.CreateUser("remote-user", "secure-password", "Remote Teammate", "remote@example.test", "member")
	if err != nil {
		t.Fatal(err)
	}
	leaveID, err := s.store.CreateUser("leave-user", "secure-password", "Absent Teammate", "leave@example.test", "member")
	if err != nil {
		t.Fatal(err)
	}
	const selectedDay = "2030-01-02"
	if err := s.store.CheckIn(1, selectedDay, "office"); err != nil {
		t.Fatal(err)
	}
	if err := s.store.CreateRequest(remoteID, "remote", selectedDay, selectedDay, "Working from home"); err != nil {
		t.Fatal(err)
	}
	if err := s.store.CreateRequest(leaveID, "leave", selectedDay, selectedDay, "Holiday"); err != nil {
		t.Fatal(err)
	}
	for _, userID := range []int64{remoteID, leaveID} {
		requests, err := s.store.Requests(userID, false, "pending")
		if err != nil || len(requests) != 1 {
			t.Fatalf("pending request for %d: %#v, %v", userID, requests, err)
		}
		if err := s.store.ReviewRequest(t.Context(), requests[0].ID, 1, "approved", "Approved"); err != nil {
			t.Fatal(err)
		}
	}

	token, _, err := s.store.CreateSession(1)
	if err != nil {
		t.Fatal(err)
	}
	request := httptest.NewRequest(http.MethodGet, "/day?date="+selectedDay, nil)
	request.AddCookie(&http.Cookie{Name: "teammate_session", Value: token})
	response := httptest.NewRecorder()
	s.http.Handler.ServeHTTP(response, request)
	if response.Code != http.StatusOK {
		t.Fatalf("day page status: %d, body %s", response.Code, response.Body.String())
	}
	for _, expected := range []string{
		"Workspace Admin", "Remote Teammate", "Absent Teammate",
		"Office · checked in", "Approved remote day", "Approved time off",
		`class="presence-badge present"`, `class="presence-badge remote"`, `class="presence-badge absent"`,
	} {
		if !strings.Contains(response.Body.String(), expected) {
			t.Fatalf("day page does not include %q", expected)
		}
	}
}

func formRequest(t *testing.T, handler http.Handler, path string, values url.Values, cookie *http.Cookie) *httptest.ResponseRecorder {
	t.Helper()
	req := httptest.NewRequest(http.MethodPost, path, strings.NewReader(values.Encode()))
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	if cookie != nil {
		req.AddCookie(cookie)
	}
	rec := httptest.NewRecorder()
	handler.ServeHTTP(rec, req)
	return rec
}

func extractCSRF(t *testing.T, body string) string {
	t.Helper()
	re := regexp.MustCompile(`name="csrf" value="([^"]+)"`)
	match := re.FindStringSubmatch(body)
	if len(match) != 2 {
		t.Fatal("page did not contain a CSRF token")
	}
	return match[1]
}