package diunwebhook_test

import (
	"bytes"
	"encoding/json"
	"errors"
	"fmt"
	"net/http"
	"net/http/httptest"
	"os"
	"sync"
	"testing"
	"time"

	diun "awesomeProject/pkg/diunwebhook"
)

func TestMain(m *testing.M) {
	diun.UpdatesReset()
	os.Exit(m.Run())
}

func TestUpdateEventAndGetUpdates(t *testing.T) {
	diun.UpdatesReset()
	event := diun.DiunEvent{
		DiunVersion: "1.0",
		Hostname:    "host",
		Status:      "new",
		Provider:    "docker",
		Image:       "nginx:latest",
		HubLink:     "https://hub.docker.com/nginx",
		MimeType:    "application/json",
		Digest:      "sha256:abc",
		Created:     time.Now(),
		Platform:    "linux/amd64",
	}
	err := diun.UpdateEvent(event)
	if err != nil {
		return
	}
	got, err := diun.GetUpdates()
	if err != nil {
		t.Fatalf("GetUpdates error: %v", err)
	}
	if len(got) != 1 {
		t.Fatalf("expected 1 update, got %d", len(got))
	}
	if got["nginx:latest"].Event.DiunVersion != "1.0" {
		t.Errorf("unexpected DiunVersion: %s", got["nginx:latest"].Event.DiunVersion)
	}
}

func TestWebhookHandler(t *testing.T) {
	diun.UpdatesReset()
	event := diun.DiunEvent{
		DiunVersion: "2.0",
		Hostname:    "host2",
		Status:      "updated",
		Provider:    "docker",
		Image:       "alpine:latest",
		HubLink:     "https://hub.docker.com/alpine",
		MimeType:    "application/json",
		Digest:      "sha256:def",
		Created:     time.Now(),
		Platform:    "linux/amd64",
	}
	body, _ := json.Marshal(event)
	req := httptest.NewRequest(http.MethodPost, "/webhook", bytes.NewReader(body))
	rec := httptest.NewRecorder()
	diun.WebhookHandler(rec, req)
	if rec.Code != http.StatusOK {
		t.Errorf("expected status 200, got %d", rec.Code)
	}
	if len(diun.GetUpdatesMap()) != 1 {
		t.Errorf("expected 1 update, got %d", len(diun.GetUpdatesMap()))
	}
}

func TestWebhookHandler_BadRequest(t *testing.T) {
	req := httptest.NewRequest(http.MethodPost, "/webhook", bytes.NewReader([]byte("not-json")))
	rec := httptest.NewRecorder()
	diun.WebhookHandler(rec, req)
	if rec.Code != http.StatusBadRequest {
		t.Errorf("expected 400 for bad JSON, got %d", rec.Code)
	}
}

func TestUpdatesHandler(t *testing.T) {
	diun.UpdatesReset()
	event := diun.DiunEvent{Image: "busybox:latest"}
	err := diun.UpdateEvent(event)
	if err != nil {
		return
	}
	req := httptest.NewRequest(http.MethodGet, "/api/updates", nil)
	rec := httptest.NewRecorder()
	diun.UpdatesHandler(rec, req)
	if rec.Code != http.StatusOK {
		t.Errorf("expected status 200, got %d", rec.Code)
	}
	var got map[string]diun.UpdateEntry
	if err := json.NewDecoder(rec.Body).Decode(&got); err != nil {
		t.Fatalf("failed to decode response: %v", err)
	}
	if _, ok := got["busybox:latest"]; !ok {
		t.Errorf("expected busybox:latest in updates")
	}
}

// Helper for simulating a broken ResponseWriter
// Used in TestUpdatesHandler_EncodeError
type failWriter struct{ http.ResponseWriter }

func (f failWriter) Header() http.Header       { return http.Header{} }
func (f failWriter) Write([]byte) (int, error) { return 0, errors.New("forced error") }
func (f failWriter) WriteHeader(_ int)         {}

func TestUpdatesHandler_EncodeError(t *testing.T) {
	rec := failWriter{httptest.NewRecorder()}
	diun.UpdatesHandler(rec, httptest.NewRequest(http.MethodGet, "/api/updates", nil))
	// No panic = pass
}

func TestWebhookHandler_MethodNotAllowed(t *testing.T) {
	methods := []string{http.MethodGet, http.MethodPut, http.MethodDelete}
	for _, method := range methods {
		req := httptest.NewRequest(method, "/webhook", nil)
		rec := httptest.NewRecorder()
		diun.WebhookHandler(rec, req)
		if rec.Code != http.StatusMethodNotAllowed {
			t.Errorf("method %s: expected 405, got %d", method, rec.Code)
		}
	}
	// POST should not return 405
	event := diun.DiunEvent{Image: "nginx:latest"}
	body, _ := json.Marshal(event)
	req := httptest.NewRequest(http.MethodPost, "/webhook", bytes.NewReader(body))
	rec := httptest.NewRecorder()
	diun.WebhookHandler(rec, req)
	if rec.Code == http.StatusMethodNotAllowed {
		t.Errorf("POST should not return 405")
	}
}

func TestWebhookHandler_EmptyImage(t *testing.T) {
	diun.UpdatesReset()
	body, _ := json.Marshal(diun.DiunEvent{Image: ""})
	req := httptest.NewRequest(http.MethodPost, "/webhook", bytes.NewReader(body))
	rec := httptest.NewRecorder()
	diun.WebhookHandler(rec, req)
	if rec.Code != http.StatusBadRequest {
		t.Errorf("expected 400 for empty image, got %d", rec.Code)
	}
	if len(diun.GetUpdatesMap()) != 0 {
		t.Errorf("expected map to stay empty, got %d entries", len(diun.GetUpdatesMap()))
	}
}

func TestConcurrentUpdateEvent(t *testing.T) {
	diun.UpdatesReset()
	const n = 100
	var wg sync.WaitGroup
	wg.Add(n)
	for i := range n {
		go func(i int) {
			defer wg.Done()
			err := diun.UpdateEvent(diun.DiunEvent{Image: fmt.Sprintf("image:%d", i)})
			if err != nil {
				return
			}
		}(i)
	}
	wg.Wait()
	if got := len(diun.GetUpdatesMap()); got != n {
		t.Errorf("expected %d entries, got %d", n, got)
	}
}

func TestMainHandlerIntegration(t *testing.T) {
	diun.UpdatesReset()
	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Path == "/webhook" {
			diun.WebhookHandler(w, r)
		} else if r.URL.Path == "/api/updates" {
			diun.UpdatesHandler(w, r)
		} else {
			w.WriteHeader(http.StatusNotFound)
		}
	}))
	defer ts.Close()

	event := diun.DiunEvent{Image: "integration:latest"}
	body, _ := json.Marshal(event)
	resp, err := http.Post(ts.URL+"/webhook", "application/json", bytes.NewReader(body))
	if err != nil {
		t.Fatalf("webhook POST failed: %v", err)
	}
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("webhook POST returned status: %d", resp.StatusCode)
	}
	if cerr := resp.Body.Close(); cerr != nil {
		t.Errorf("failed to close response body: %v", cerr)
	}

	resp, err = http.Get(ts.URL + "/api/updates")
	if err != nil {
		t.Fatalf("GET /api/updates failed: %v", err)
	}
	defer func() {
		if cerr := resp.Body.Close(); cerr != nil {
			t.Errorf("failed to close response body: %v", cerr)
		}
	}()
	var got map[string]diun.UpdateEntry
	if err := json.NewDecoder(resp.Body).Decode(&got); err != nil {
		t.Fatalf("decode failed: %v", err)
	}
	if _, ok := got["integration:latest"]; !ok {
		t.Errorf("expected integration:latest in updates")
	}
}

func TestDismissHandler_Success(t *testing.T) {
	diun.UpdatesReset()
	err := diun.UpdateEvent(diun.DiunEvent{Image: "nginx:latest"})
	if err != nil {
		return
	}

	req := httptest.NewRequest(http.MethodPatch, "/api/updates/nginx:latest", nil)
	rec := httptest.NewRecorder()
	diun.DismissHandler(rec, req)
	if rec.Code != http.StatusNoContent {
		t.Errorf("expected 204, got %d", rec.Code)
	}
	m := diun.GetUpdatesMap()
	if len(m) != 1 {
		t.Errorf("expected entry to remain after acknowledge, got %d entries", len(m))
	}
	if !m["nginx:latest"].Acknowledged {
		t.Errorf("expected entry to be acknowledged")
	}
}

func TestDismissHandler_NotFound(t *testing.T) {
	diun.UpdatesReset()

	req := httptest.NewRequest(http.MethodPatch, "/api/updates/does-not-exist:latest", nil)
	rec := httptest.NewRecorder()
	diun.DismissHandler(rec, req)
	if rec.Code != http.StatusNotFound {
		t.Errorf("expected 404, got %d", rec.Code)
	}
}

func TestDismissHandler_EmptyImage(t *testing.T) {
	req := httptest.NewRequest(http.MethodPatch, "/api/updates/", nil)
	rec := httptest.NewRecorder()
	diun.DismissHandler(rec, req)
	if rec.Code != http.StatusBadRequest {
		t.Errorf("expected 400, got %d", rec.Code)
	}
}

func TestDismissHandler_SlashInImageName(t *testing.T) {
	diun.UpdatesReset()
	err := diun.UpdateEvent(diun.DiunEvent{Image: "ghcr.io/user/image:tag"})
	if err != nil {
		return
	}

	req := httptest.NewRequest(http.MethodPatch, "/api/updates/ghcr.io/user/image:tag", nil)
	rec := httptest.NewRecorder()
	diun.DismissHandler(rec, req)
	if rec.Code != http.StatusNoContent {
		t.Errorf("expected 204, got %d", rec.Code)
	}
	m := diun.GetUpdatesMap()
	if len(m) != 1 {
		t.Errorf("expected entry to remain after acknowledge, got %d entries", len(m))
	}
	if !m["ghcr.io/user/image:tag"].Acknowledged {
		t.Errorf("expected entry to be acknowledged")
	}
}

func TestDismissHandler_ReappearsAfterNewWebhook(t *testing.T) {
	diun.UpdatesReset()
	diun.UpdateEvent(diun.DiunEvent{Image: "nginx:latest"})

	req := httptest.NewRequest(http.MethodPatch, "/api/updates/nginx:latest", nil)
	rec := httptest.NewRecorder()
	diun.DismissHandler(rec, req)
	if rec.Code != http.StatusNoContent {
		t.Fatalf("expected 204 on acknowledge, got %d", rec.Code)
	}
	if !diun.GetUpdatesMap()["nginx:latest"].Acknowledged {
		t.Errorf("expected entry to be acknowledged after PATCH")
	}

	diun.UpdateEvent(diun.DiunEvent{Image: "nginx:latest", Status: "update"})
	m := diun.GetUpdatesMap()
	if len(m) != 1 {
		t.Errorf("expected entry to remain, got %d entries", len(m))
	}
	if m["nginx:latest"].Event.Status != "update" {
		t.Errorf("unexpected status: %s", m["nginx:latest"].Event.Status)
	}
	if m["nginx:latest"].Acknowledged {
		t.Errorf("expected acknowledged to be reset after new webhook")
	}
}

// --- Tag handler tests ---

func postTag(t *testing.T, name string) (int, int) {
	t.Helper()
	body, _ := json.Marshal(map[string]string{"name": name})
	req := httptest.NewRequest(http.MethodPost, "/api/tags", bytes.NewReader(body))
	rec := httptest.NewRecorder()
	diun.TagsHandler(rec, req)
	return rec.Code, rec.Body.Len()
}

func postTagAndGetID(t *testing.T, name string) int {
	t.Helper()
	body, _ := json.Marshal(map[string]string{"name": name})
	req := httptest.NewRequest(http.MethodPost, "/api/tags", bytes.NewReader(body))
	rec := httptest.NewRecorder()
	diun.TagsHandler(rec, req)
	if rec.Code != http.StatusCreated {
		t.Fatalf("expected 201 creating tag %q, got %d", name, rec.Code)
	}
	var tag diun.Tag
	json.NewDecoder(rec.Body).Decode(&tag)
	return tag.ID
}

func TestCreateTagHandler_Success(t *testing.T) {
	diun.UpdatesReset()
	body, _ := json.Marshal(map[string]string{"name": "nextcloud"})
	req := httptest.NewRequest(http.MethodPost, "/api/tags", bytes.NewReader(body))
	rec := httptest.NewRecorder()
	diun.TagsHandler(rec, req)
	if rec.Code != http.StatusCreated {
		t.Fatalf("expected 201, got %d", rec.Code)
	}
	var tag diun.Tag
	if err := json.NewDecoder(rec.Body).Decode(&tag); err != nil {
		t.Fatalf("decode failed: %v", err)
	}
	if tag.Name != "nextcloud" {
		t.Errorf("expected name 'nextcloud', got %q", tag.Name)
	}
	if tag.ID == 0 {
		t.Errorf("expected non-zero ID")
	}
}

func TestCreateTagHandler_DuplicateName(t *testing.T) {
	diun.UpdatesReset()
	postTag(t, "monitoring")
	code, _ := postTag(t, "monitoring")
	if code != http.StatusConflict {
		t.Errorf("expected 409, got %d", code)
	}
}

func TestCreateTagHandler_EmptyName(t *testing.T) {
	diun.UpdatesReset()
	body, _ := json.Marshal(map[string]string{"name": ""})
	req := httptest.NewRequest(http.MethodPost, "/api/tags", bytes.NewReader(body))
	rec := httptest.NewRecorder()
	diun.TagsHandler(rec, req)
	if rec.Code != http.StatusBadRequest {
		t.Errorf("expected 400, got %d", rec.Code)
	}
}

func TestGetTagsHandler_Empty(t *testing.T) {
	diun.UpdatesReset()
	req := httptest.NewRequest(http.MethodGet, "/api/tags", nil)
	rec := httptest.NewRecorder()
	diun.TagsHandler(rec, req)
	if rec.Code != http.StatusOK {
		t.Fatalf("expected 200, got %d", rec.Code)
	}
	var tags []diun.Tag
	json.NewDecoder(rec.Body).Decode(&tags)
	if len(tags) != 0 {
		t.Errorf("expected empty list, got %d tags", len(tags))
	}
}

func TestGetTagsHandler_WithTags(t *testing.T) {
	diun.UpdatesReset()
	postTag(t, "alpha")
	postTag(t, "beta")
	req := httptest.NewRequest(http.MethodGet, "/api/tags", nil)
	rec := httptest.NewRecorder()
	diun.TagsHandler(rec, req)
	if rec.Code != http.StatusOK {
		t.Fatalf("expected 200, got %d", rec.Code)
	}
	var tags []diun.Tag
	json.NewDecoder(rec.Body).Decode(&tags)
	if len(tags) != 2 {
		t.Errorf("expected 2 tags, got %d", len(tags))
	}
}

func TestDeleteTagHandler_Success(t *testing.T) {
	diun.UpdatesReset()
	id := postTagAndGetID(t, "to-delete")
	req := httptest.NewRequest(http.MethodDelete, fmt.Sprintf("/api/tags/%d", id), nil)
	rec := httptest.NewRecorder()
	diun.TagByIDHandler(rec, req)
	if rec.Code != http.StatusNoContent {
		t.Errorf("expected 204, got %d", rec.Code)
	}
}

func TestDeleteTagHandler_NotFound(t *testing.T) {
	diun.UpdatesReset()
	req := httptest.NewRequest(http.MethodDelete, "/api/tags/9999", nil)
	rec := httptest.NewRecorder()
	diun.TagByIDHandler(rec, req)
	if rec.Code != http.StatusNotFound {
		t.Errorf("expected 404, got %d", rec.Code)
	}
}

func TestDeleteTagHandler_CascadesAssignment(t *testing.T) {
	diun.UpdatesReset()
	diun.UpdateEvent(diun.DiunEvent{Image: "nginx:latest"})
	id := postTagAndGetID(t, "cascade-test")

	// Assign the tag
	body, _ := json.Marshal(map[string]interface{}{"image": "nginx:latest", "tag_id": id})
	req := httptest.NewRequest(http.MethodPut, "/api/tag-assignments", bytes.NewReader(body))
	rec := httptest.NewRecorder()
	diun.TagAssignmentHandler(rec, req)
	if rec.Code != http.StatusNoContent {
		t.Fatalf("expected 204 on assign, got %d", rec.Code)
	}

	// Delete the tag
	req = httptest.NewRequest(http.MethodDelete, fmt.Sprintf("/api/tags/%d", id), nil)
	rec = httptest.NewRecorder()
	diun.TagByIDHandler(rec, req)
	if rec.Code != http.StatusNoContent {
		t.Fatalf("expected 204 on delete, got %d", rec.Code)
	}

	// Confirm assignment cascaded
	m := diun.GetUpdatesMap()
	if m["nginx:latest"].Tag != nil {
		t.Errorf("expected tag to be nil after cascade delete, got %+v", m["nginx:latest"].Tag)
	}
}

func TestTagAssignmentHandler_Assign(t *testing.T) {
	diun.UpdatesReset()
	diun.UpdateEvent(diun.DiunEvent{Image: "alpine:latest"})
	id := postTagAndGetID(t, "assign-test")

	body, _ := json.Marshal(map[string]interface{}{"image": "alpine:latest", "tag_id": id})
	req := httptest.NewRequest(http.MethodPut, "/api/tag-assignments", bytes.NewReader(body))
	rec := httptest.NewRecorder()
	diun.TagAssignmentHandler(rec, req)
	if rec.Code != http.StatusNoContent {
		t.Errorf("expected 204, got %d", rec.Code)
	}
}

func TestTagAssignmentHandler_Reassign(t *testing.T) {
	diun.UpdatesReset()
	diun.UpdateEvent(diun.DiunEvent{Image: "redis:latest"})
	id1 := postTagAndGetID(t, "group-a")
	id2 := postTagAndGetID(t, "group-b")

	assign := func(tagID int) {
		body, _ := json.Marshal(map[string]interface{}{"image": "redis:latest", "tag_id": tagID})
		req := httptest.NewRequest(http.MethodPut, "/api/tag-assignments", bytes.NewReader(body))
		rec := httptest.NewRecorder()
		diun.TagAssignmentHandler(rec, req)
		if rec.Code != http.StatusNoContent {
			t.Fatalf("expected 204, got %d", rec.Code)
		}
	}

	assign(id1)
	assign(id2)

	m := diun.GetUpdatesMap()
	if m["redis:latest"].Tag == nil || m["redis:latest"].Tag.ID != id2 {
		t.Errorf("expected tag id %d after reassign, got %+v", id2, m["redis:latest"].Tag)
	}
}

func TestTagAssignmentHandler_Unassign(t *testing.T) {
	diun.UpdatesReset()
	diun.UpdateEvent(diun.DiunEvent{Image: "busybox:latest"})
	id := postTagAndGetID(t, "unassign-test")

	body, _ := json.Marshal(map[string]interface{}{"image": "busybox:latest", "tag_id": id})
	req := httptest.NewRequest(http.MethodPut, "/api/tag-assignments", bytes.NewReader(body))
	rec := httptest.NewRecorder()
	diun.TagAssignmentHandler(rec, req)

	// Now unassign
	body, _ = json.Marshal(map[string]string{"image": "busybox:latest"})
	req = httptest.NewRequest(http.MethodDelete, "/api/tag-assignments", bytes.NewReader(body))
	rec = httptest.NewRecorder()
	diun.TagAssignmentHandler(rec, req)
	if rec.Code != http.StatusNoContent {
		t.Errorf("expected 204, got %d", rec.Code)
	}

	m := diun.GetUpdatesMap()
	if m["busybox:latest"].Tag != nil {
		t.Errorf("expected tag nil after unassign, got %+v", m["busybox:latest"].Tag)
	}
}

func TestGetUpdates_IncludesTag(t *testing.T) {
	diun.UpdatesReset()
	diun.UpdateEvent(diun.DiunEvent{Image: "postgres:latest"})
	id := postTagAndGetID(t, "databases")

	body, _ := json.Marshal(map[string]interface{}{"image": "postgres:latest", "tag_id": id})
	req := httptest.NewRequest(http.MethodPut, "/api/tag-assignments", bytes.NewReader(body))
	rec := httptest.NewRecorder()
	diun.TagAssignmentHandler(rec, req)
	if rec.Code != http.StatusNoContent {
		t.Fatalf("expected 204, got %d", rec.Code)
	}

	m := diun.GetUpdatesMap()
	entry, ok := m["postgres:latest"]
	if !ok {
		t.Fatal("expected postgres:latest in updates")
	}
	if entry.Tag == nil {
		t.Fatal("expected tag to be set")
	}
	if entry.Tag.Name != "databases" {
		t.Errorf("expected tag name 'databases', got %q", entry.Tag.Name)
	}
	if entry.Tag.ID != id {
		t.Errorf("expected tag id %d, got %d", id, entry.Tag.ID)
	}
}