package netbox_test

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

	"git.georgsen.dk/hwlab/internal/netbox"
)

func TestNewClientValidation(t *testing.T) {
	_, err := netbox.NewClient("", "token")
	if err == nil {
		t.Error("expected error for empty url")
	}

	_, err = netbox.NewClient("http://10.5.0.130:8000/api", "")
	if err == nil {
		t.Error("expected error for empty token")
	}

	c, err := netbox.NewClient("http://10.5.0.130:8000/api", "sometoken")
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if c == nil {
		t.Error("expected non-nil client")
	}
}

// integrationToken returns the real NetBox token from env, or skips the test
// if only the placeholder is present (placeholder is never 40 hex chars).
func integrationToken(t *testing.T) string {
	t.Helper()
	token := os.Getenv("HWLAB_NETBOX_TOKEN")
	if len(token) != 40 {
		t.Skip("HWLAB_NETBOX_TOKEN is not a real 40-char token — skipping integration test")
	}
	return token
}

func TestPingLive(t *testing.T) {
	token := integrationToken(t)
	c, err := netbox.NewClient("http://10.5.0.130:8000/api", token)
	if err != nil {
		t.Fatalf("NewClient: %v", err)
	}
	if err := c.Ping(context.Background()); err != nil {
		t.Fatalf("Ping: %v", err)
	}
}

func TestListDevicesLive(t *testing.T) {
	token := integrationToken(t)
	c, _ := netbox.NewClient("http://10.5.0.130:8000/api", token)
	devices, err := c.ListDevices(context.Background(), 5)
	if err != nil {
		t.Fatalf("ListDevices: %v", err)
	}
	t.Logf("found %d devices in NetBox", len(devices))
	// Not asserting count — NetBox may be empty; just assert no error
}

// TestCreateDeviceValidation verifies that CreateDevice rejects an empty name
// without making any NetBox API call.
func TestCreateDeviceValidation(t *testing.T) {
	c, err := netbox.NewClient("http://10.5.0.130:8000/api", "sometoken")
	if err != nil {
		t.Fatalf("NewClient: %v", err)
	}
	_, err = c.CreateDevice(context.Background(), "", "HW-00001", 1, 1, 1)
	if err == nil {
		t.Error("expected error for empty device name")
	}
}

// TestCreateDeviceLive creates a real device in NetBox and deletes it as cleanup.
// Requires HWLAB_NETBOX_TOKEN (40 chars) and HWLAB_TEST_SITE_ID to be set.
func TestCreateDeviceLive(t *testing.T) {
	token := integrationToken(t)
	siteIDStr := os.Getenv("HWLAB_TEST_SITE_ID")
	if siteIDStr == "" {
		t.Skip("HWLAB_TEST_SITE_ID not set — skipping live CreateDevice test")
	}

	// Parse site ID
	var siteID int32
	if _, err := fmt.Sscanf(siteIDStr, "%d", &siteID); err != nil {
		t.Fatalf("HWLAB_TEST_SITE_ID is not a valid int: %v", err)
	}

	// These must exist in the NetBox instance used for integration testing.
	// Device type 1 and role 1 are typically pre-provisioned.
	const (
		testDeviceTypeID int32 = 1
		testRoleID       int32 = 1
	)

	c, err := netbox.NewClient("http://10.5.0.130:8000/api", token)
	if err != nil {
		t.Fatalf("NewClient: %v", err)
	}

	id, err := c.CreateDevice(context.Background(), "hwlab-test-device", "HW-TEST-01", testDeviceTypeID, testRoleID, siteID)
	if err != nil {
		t.Fatalf("CreateDevice: %v", err)
	}
	if id <= 0 {
		t.Errorf("expected positive device ID, got %d", id)
	}
	t.Logf("created device id=%d — will clean up", id)

	// Cleanup: delete the test device
	if err := c.DeleteDevice(context.Background(), id); err != nil {
		t.Logf("cleanup warning: DeleteDevice(%d): %v", id, err)
	}
}

// TestCreateCable_EmptyLabel verifies that CreateCable rejects an empty label
// without making any NetBox API call.
func TestCreateCable_EmptyLabel(t *testing.T) {
	c, err := netbox.NewClient("http://localhost:8001", "token")
	if err != nil {
		t.Fatalf("NewClient: %v", err)
	}
	_, err = c.CreateCable(context.Background(), "", "HW-00001", `{"cable_type":0}`)
	if err == nil {
		t.Fatal("expected error for empty label, got nil")
	}
	if !strings.Contains(err.Error(), "cable label must not be empty") {
		t.Fatalf("unexpected error: %v", err)
	}
}

// TestCreateCable_Success verifies that CreateCable returns a positive ID on 201.
// Uses httptest.NewUnstartedServer so srv.URL is accessible inside the handler closure.
func TestCreateCable_Success(t *testing.T) {
	var srvURL string
	srv := httptest.NewUnstartedServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method == http.MethodPost && r.URL.Path == "/api/dcim/cables/" {
			w.Header().Set("Content-Type", "application/json")
			w.WriteHeader(http.StatusCreated)
			// Cable model requires id, url, and display fields.
			_ = json.NewEncoder(w).Encode(map[string]interface{}{
				"id":      42,
				"url":     srvURL + "/api/dcim/cables/42/",
				"display": "USB-C 2m Cable",
				"label":   "USB-C 2m Cable",
			})
			return
		}
		http.NotFound(w, r)
	}))
	srv.Start()
	srvURL = srv.URL
	defer srv.Close()

	c, err := netbox.NewClient(srv.URL, "token")
	if err != nil {
		t.Fatalf("NewClient: %v", err)
	}
	id, err := c.CreateCable(context.Background(), "USB-C 2m Cable", "HW-00042", `{"cable_type":0}`)
	if err != nil {
		t.Fatalf("CreateCable: %v", err)
	}
	if id <= 0 {
		t.Fatalf("expected id > 0, got %d", id)
	}
}

// TestCreateCable_UnprocessableEntity verifies that a 422 from NetBox returns an error.
func TestCreateCable_UnprocessableEntity(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method == http.MethodPost && r.URL.Path == "/api/dcim/cables/" {
			w.Header().Set("Content-Type", "application/json")
			w.WriteHeader(http.StatusUnprocessableEntity)
			_ = json.NewEncoder(w).Encode(map[string]string{"label": "This field may not be blank."})
			return
		}
		http.NotFound(w, r)
	}))
	defer srv.Close()

	c, err := netbox.NewClient(srv.URL, "token")
	if err != nil {
		t.Fatalf("NewClient: %v", err)
	}
	_, err = c.CreateCable(context.Background(), "USB-C 2m Cable", "HW-00099", `{}`)
	if err == nil {
		t.Fatal("expected error on 422, got nil")
	}
}