package web

import (
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"net/url"
	"path/filepath"
	"strings"
	"testing"
	"time"

	"github.com/domagojzecevic/cammonitor/internal/auth"
	"github.com/domagojzecevic/cammonitor/internal/config"
	"github.com/domagojzecevic/cammonitor/internal/db"
	"github.com/domagojzecevic/cammonitor/internal/footage"
)

func TestHealthReturnsOK(t *testing.T) {
	router := NewRouter(nil, nil, nil)

	request := httptest.NewRequest(http.MethodGet, "/health", nil)
	response := httptest.NewRecorder()

	router.ServeHTTP(response, request)

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

	var body map[string]string
	if err := json.NewDecoder(response.Body).Decode(&body); err != nil {
		t.Fatalf("decode response body: %v", err)
	}

	if body["status"] != "ok" {
		t.Fatalf("expected status ok, got %q", body["status"])
	}
}

func TestAdminUsersRedirectsWithoutSessionCookie(t *testing.T) {
	database, err := db.Open(filepath.Join(t.TempDir(), "cammonitor.db"))
	if err != nil {
		t.Fatalf("open database: %v", err)
	}
	t.Cleanup(func() {
		if err := database.Close(); err != nil {
			t.Fatalf("close database: %v", err)
		}
	})

	router := NewRouter(&config.Config{SessionTTL: time.Hour}, database, nil)

	request := httptest.NewRequest(http.MethodGet, "/admin/users", nil)
	response := httptest.NewRecorder()

	router.ServeHTTP(response, request)

	if response.Code != http.StatusFound {
		t.Fatalf("expected status %d, got %d", http.StatusFound, response.Code)
	}

	if location := response.Header().Get("Location"); location != "/login" {
		t.Fatalf("expected redirect to /login, got %q", location)
	}
}

func TestIndexRedirectsToNewestDayImages(t *testing.T) {
	router, cookie := newAuthenticatedRouter(t)

	request := httptest.NewRequest(http.MethodGet, "/", nil)
	request.AddCookie(cookie)
	response := httptest.NewRecorder()

	router.ServeHTTP(response, request)

	if response.Code != http.StatusFound {
		t.Fatalf("expected status %d, got %d", http.StatusFound, response.Code)
	}
	if location := response.Header().Get("Location"); location != "/day/20260102/images" {
		t.Fatalf("expected redirect to newest day images, got %q", location)
	}
}

func TestDayOverviewRendersShellNavigationAndCounts(t *testing.T) {
	router, cookie := newAuthenticatedRouter(t)

	request := httptest.NewRequest(http.MethodGet, "/day/20260101", nil)
	request.AddCookie(cookie)
	response := httptest.NewRecorder()

	router.ServeHTTP(response, request)

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

	body := response.Body.String()
	for _, want := range []string{
		`https://cdn.tailwindcss.com`,
		`class="hidden w-56 shrink-0 border-r border-slate-800 bg-slate-950 md:block"`,
		`data-mobile-drawer`,
		`class="fixed inset-x-0 bottom-0 z-20 grid grid-cols-2 border-t border-slate-800 bg-slate-950/95 md:hidden"`,
		`2026-01`,
		`href="/day/20260102"`,
		`href="/day/20260101"`,
		`Images (2)`,
		`Videos (2)`,
		`href="/day/20260101/images"`,
		`href="/day/20260101/videos"`,
	} {
		if !strings.Contains(body, want) {
			t.Fatalf("expected response to contain %q\nbody:\n%s", want, body)
		}
	}
}

func TestDayOverviewReturnsNotFoundForMissingDay(t *testing.T) {
	router, cookie := newAuthenticatedRouter(t)

	request := httptest.NewRequest(http.MethodGet, "/day/20260103", nil)
	request.AddCookie(cookie)
	response := httptest.NewRecorder()

	router.ServeHTTP(response, request)

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

func TestImagePageRendersAuthenticatedBrowser(t *testing.T) {
	router, cookie := newAuthenticatedRouter(t)

	request := httptest.NewRequest(http.MethodGet, "/day/20260101/images?idx=1", nil)
	request.AddCookie(cookie)
	response := httptest.NewRecorder()

	router.ServeHTTP(response, request)

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

	body := response.Body.String()
	for _, want := range []string{
		`data-image-browser`,
		`data-active-index="1"`,
		`href="/day/20260101/images?idx=0"`,
		`href="/day/20260101/images?idx=1"`,
		`src="/raw/image/20260101/images/A26010112050001.jpg"`,
		`src="/thumb/image/20260101/images/A26010112000001.jpg"`,
		`data-prev-index="0"`,
		`data-next-index="0"`,
		`keydown`,
		`ArrowLeft`,
		`ArrowRight`,
		`ring-2 ring-indigo-400`,
	} {
		if !strings.Contains(body, want) {
			t.Fatalf("expected response to contain %q\nbody:\n%s", want, body)
		}
	}
}

func TestVideoPageRendersAuthenticatedBrowser(t *testing.T) {
	router, cookie := newAuthenticatedRouter(t)

	request := httptest.NewRequest(http.MethodGet, "/day/20260101/videos?idx=1", nil)
	request.AddCookie(cookie)
	response := httptest.NewRecorder()

	router.ServeHTTP(response, request)

	if response.Code != http.StatusOK {
		t.Fatalf("expected status %d, got %d: %s", http.StatusOK, response.Code, response.Body.String())
	}

	body := response.Body.String()
	for _, want := range []string{
		`data-video-browser`,
		`data-active-index="1"`,
		`href="/day/20260101/videos?idx=0"`,
		`href="/day/20260101/videos?idx=1"`,
		`src="/stream/video/20260101/record/A260101_120500_120530.265"`,
		`src="/thumb/video/20260101/record/A260101_120000_120015.265"`,
		`data-nav="prev"`,
		`data-nav="next"`,
		`keydown`,
		`ArrowLeft`,
		`ArrowRight`,
		`ring-2 ring-indigo-400`,
	} {
		if !strings.Contains(body, want) {
			t.Fatalf("expected response to contain %q\nbody:\n%s", want, body)
		}
	}
}

func newAuthenticatedRouter(t *testing.T) (http.Handler, *http.Cookie) {
	t.Helper()

	database, err := db.Open(filepath.Join(t.TempDir(), "cammonitor.db"))
	if err != nil {
		t.Fatalf("open database: %v", err)
	}
	t.Cleanup(func() {
		if err := database.Close(); err != nil {
			t.Fatalf("close database: %v", err)
		}
	})

	store := auth.NewStore(database)
	if err := store.EnsureAdmin("admin", "secret"); err != nil {
		t.Fatalf("ensure admin: %v", err)
	}

	footageRoot := filepath.Join("..", "..", "testdata", "footage")
	index := footage.NewIndex(footageRoot, time.Hour)
	t.Cleanup(index.Close)

	router := NewRouter(&config.Config{FootageRoot: footageRoot, SessionTTL: time.Hour}, database, index)
	cookie := login(t, router)

	return router, cookie
}

func login(t *testing.T, router http.Handler) *http.Cookie {
	t.Helper()

	form := url.Values{
		"username": {"admin"},
		"password": {"secret"},
	}
	request := httptest.NewRequest(http.MethodPost, "/login", strings.NewReader(form.Encode()))
	request.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	response := httptest.NewRecorder()

	router.ServeHTTP(response, request)

	if response.Code != http.StatusSeeOther {
		t.Fatalf("expected login status %d, got %d", http.StatusSeeOther, response.Code)
	}

	for _, cookie := range response.Result().Cookies() {
		if cookie.Name == "session" && cookie.Value != "" {
			return cookie
		}
	}
	t.Fatalf("expected login response to set session cookie")
	return nil
}