package handlers_test

import (
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"mime/multipart"
	"net/http"
	"net/http/httptest"
	"testing"

	"git.georgsen.dk/hwlab/internal/ai"
	"git.georgsen.dk/hwlab/internal/api/handlers"
	"git.georgsen.dk/hwlab/internal/inventory"
	"git.georgsen.dk/hwlab/internal/netbox"
	"git.georgsen.dk/hwlab/internal/queue"
)

// --- Mock orchestrator ---

type mockOrchestrator struct {
	FixedResult *ai.IntakeResult
	FixedStatus inventory.CatalogStatus
	FixedErr    error
}

func (m *mockOrchestrator) Analyze(_ context.Context, _ ai.IntakeRequest) (*ai.IntakeResult, inventory.CatalogStatus, error) {
	if m.FixedErr != nil {
		return nil, "", m.FixedErr
	}
	return m.FixedResult, m.FixedStatus, nil
}

// --- Mock NetBox client ---

type mockNetBox struct {
	allocateHWID    string
	allocateErr     error
	createDeviceID  int64
	createDeviceErr error
	patchErr        error
	syncTagsResult  []netbox.TagRef
	syncTagsErr     error
	createCalled    int
}

func (m *mockNetBox) AllocateNextHWID(_ context.Context) (string, error) {
	return m.allocateHWID, m.allocateErr
}

func (m *mockNetBox) CreateDevice(_ context.Context, _, _ string, _, _, _ int32) (int64, error) {
	m.createCalled++
	return m.createDeviceID, m.createDeviceErr
}

func (m *mockNetBox) PatchCustomFields(_ context.Context, _ int64, _ map[string]interface{}) error {
	return m.patchErr
}

func (m *mockNetBox) SyncTags(_ context.Context, _ []string) ([]netbox.TagRef, error) {
	return m.syncTagsResult, m.syncTagsErr
}

// --- Mock catalog updater ---

type mockCatalogUpdater struct {
	updateErr error
}

func (m *mockCatalogUpdater) UpdateCatalogStatus(_ context.Context, _ int64, _, next inventory.CatalogStatus) (inventory.CatalogStatus, error) {
	return next, m.updateErr
}

// --- Mock WAQ ---

type mockWAQ struct {
	enqueued []queue.PendingOp
	enqueueErr error
}

func (m *mockWAQ) Enqueue(_ context.Context, op queue.PendingOp) error {
	if m.enqueueErr != nil {
		return m.enqueueErr
	}
	m.enqueued = append(m.enqueued, op)
	return nil
}

// --- Helpers ---

// buildMultipartRequest creates a multipart/form-data POST request with n photo files.
func buildMultipartRequest(t *testing.T, n int) *http.Request {
	t.Helper()
	var body bytes.Buffer
	w := multipart.NewWriter(&body)
	for i := 0; i < n; i++ {
		fw, err := w.CreateFormFile("photos", "test.jpg")
		if err != nil {
			t.Fatalf("create form file: %v", err)
		}
		// Minimal JPEG header bytes for content-type detection
		fw.Write([]byte{0xff, 0xd8, 0xff, 0xe0, 0x00, 0x10})
	}
	w.Close()
	req := httptest.NewRequest(http.MethodPost, "/api/intake", &body)
	req.Header.Set("Content-Type", w.FormDataContentType())
	return req
}

func defaultOrchResult(confidence float64) *mockOrchestrator {
	status := inventory.StatusIndexed
	if confidence < 0.75 {
		status = inventory.StatusNeedsResearch
	}
	return &mockOrchestrator{
		FixedResult: &ai.IntakeResult{
			SerialNumber: "SN-001",
			Model:        "Model X",
			Manufacturer: "Acme",
			Category:     "compute",
			Specs:        map[string]string{"cpu": "Intel"},
			SuggestedTags: []string{"server"},
			AINotes:      "Test item",
			Confidence:   confidence,
		},
		FixedStatus: status,
	}
}

func defaultNetBox() *mockNetBox {
	return &mockNetBox{
		allocateHWID:   "HW-00001",
		createDeviceID: 42,
	}
}

func newHandler(orch handlers.IntakeOrchestrator, nb handlers.IntakeNetBoxClient, cu handlers.IntakeCatalogUpdater, w handlers.IntakeWAQ, quickAdd bool, quickThresh float64) *handlers.IntakeHandler {
	return handlers.NewIntakeHandler(orch, nb, cu, w, 1, 1, 1, quickAdd, quickThresh, nil)
}

// --- Mock printer ---

type mockPrinter struct {
	returnErr error
	called    bool
}

func (m *mockPrinter) Print(bitmap []byte, w, h int) error {
	m.called = true
	return m.returnErr
}

// --- Tests ---

func TestIntakeHandlerRejectsZeroPhotos(t *testing.T) {
	h := newHandler(defaultOrchResult(0.95), defaultNetBox(), &mockCatalogUpdater{}, &mockWAQ{}, false, 0.90)
	req := buildMultipartRequest(t, 0)
	rec := httptest.NewRecorder()
	h.ServeHTTP(rec, req)
	if rec.Code != http.StatusBadRequest {
		t.Errorf("expected 400, got %d", rec.Code)
	}
}

func TestIntakeHandlerRejectsFourPhotos(t *testing.T) {
	h := newHandler(defaultOrchResult(0.95), defaultNetBox(), &mockCatalogUpdater{}, &mockWAQ{}, false, 0.90)
	req := buildMultipartRequest(t, 4)
	rec := httptest.NewRecorder()
	h.ServeHTTP(rec, req)
	if rec.Code != http.StatusBadRequest {
		t.Errorf("expected 400, got %d", rec.Code)
	}
}

func TestIntakeHandlerHighConfidence(t *testing.T) {
	orch := defaultOrchResult(0.95)
	nb := defaultNetBox()
	h := newHandler(orch, nb, &mockCatalogUpdater{}, &mockWAQ{}, false, 0.90)

	req := buildMultipartRequest(t, 1)
	rec := httptest.NewRecorder()
	h.ServeHTTP(rec, req)

	if rec.Code != http.StatusCreated {
		t.Errorf("expected 201, got %d: body=%s", rec.Code, rec.Body.String())
	}

	var resp handlers.IntakeResponse
	if err := json.NewDecoder(rec.Body).Decode(&resp); err != nil {
		t.Fatalf("decode response: %v", err)
	}
	if resp.HWID != "HW-00001" {
		t.Errorf("expected hw_id=HW-00001, got %s", resp.HWID)
	}
	if resp.Model != "Model X" {
		t.Errorf("expected model=Model X, got %s", resp.Model)
	}
	if resp.Manufacturer != "Acme" {
		t.Errorf("expected manufacturer=Acme, got %s", resp.Manufacturer)
	}
	if resp.CatalogStatus != string(inventory.StatusIndexed) {
		t.Errorf("expected catalog_status=%s, got %s", inventory.StatusIndexed, resp.CatalogStatus)
	}
}

func TestIntakeHandlerLowConfidence(t *testing.T) {
	orch := defaultOrchResult(0.40)
	nb := defaultNetBox()
	h := newHandler(orch, nb, &mockCatalogUpdater{}, &mockWAQ{}, false, 0.90)

	req := buildMultipartRequest(t, 1)
	rec := httptest.NewRecorder()
	h.ServeHTTP(rec, req)

	if rec.Code != http.StatusCreated {
		t.Errorf("expected 201, got %d", rec.Code)
	}

	var resp handlers.IntakeResponse
	if err := json.NewDecoder(rec.Body).Decode(&resp); err != nil {
		t.Fatalf("decode response: %v", err)
	}
	if resp.CatalogStatus != string(inventory.StatusNeedsResearch) {
		t.Errorf("expected catalog_status=%s, got %s", inventory.StatusNeedsResearch, resp.CatalogStatus)
	}
}

func TestIntakeHandlerQuickAdd(t *testing.T) {
	orch := defaultOrchResult(0.95)
	nb := defaultNetBox()
	h := newHandler(orch, nb, &mockCatalogUpdater{}, &mockWAQ{}, true, 0.90)

	req := buildMultipartRequest(t, 1)
	rec := httptest.NewRecorder()
	h.ServeHTTP(rec, req)

	if rec.Code != http.StatusCreated {
		t.Errorf("expected 201, got %d: body=%s", rec.Code, rec.Body.String())
	}
	// CreateDevice must have been called exactly once
	if nb.createCalled != 1 {
		t.Errorf("expected CreateDevice called 1 time, got %d", nb.createCalled)
	}
	var resp handlers.IntakeResponse
	if err := json.NewDecoder(rec.Body).Decode(&resp); err != nil {
		t.Fatalf("decode response: %v", err)
	}
	if resp.HWID != "HW-00001" {
		t.Errorf("expected hw_id=HW-00001, got %s", resp.HWID)
	}
}

func TestIntakeHandlerNetBoxDown(t *testing.T) {
	orch := defaultOrchResult(0.95)
	nb := &mockNetBox{
		allocateHWID:    "HW-00001",
		createDeviceErr: fmt.Errorf("connection refused"),
	}
	waq := &mockWAQ{}
	h := newHandler(orch, nb, &mockCatalogUpdater{}, waq, false, 0.90)

	req := buildMultipartRequest(t, 1)
	rec := httptest.NewRecorder()
	h.ServeHTTP(rec, req)

	if rec.Code != http.StatusAccepted {
		t.Errorf("expected 202, got %d: body=%s", rec.Code, rec.Body.String())
	}
	var resp handlers.IntakeResponse
	if err := json.NewDecoder(rec.Body).Decode(&resp); err != nil {
		t.Fatalf("decode response: %v", err)
	}
	if !resp.Queued {
		t.Error("expected queued=true in response")
	}
	if len(waq.enqueued) != 1 {
		t.Errorf("expected 1 op enqueued, got %d", len(waq.enqueued))
	}
}

// TestIntakePrinterSuccess: mock printer returns nil — print_skipped=false, 201.
func TestIntakePrinterSuccess(t *testing.T) {
	orch := defaultOrchResult(0.95)
	nb := defaultNetBox()
	p := &mockPrinter{}
	h := handlers.NewIntakeHandler(orch, nb, &mockCatalogUpdater{}, &mockWAQ{}, 1, 1, 1, false, 0.90, p)

	req := buildMultipartRequest(t, 1)
	rec := httptest.NewRecorder()
	h.ServeHTTP(rec, req)

	if rec.Code != http.StatusCreated {
		t.Errorf("expected 201, got %d: body=%s", rec.Code, rec.Body.String())
	}
	var resp handlers.IntakeResponse
	if err := json.NewDecoder(rec.Body).Decode(&resp); err != nil {
		t.Fatalf("decode response: %v", err)
	}
	if resp.PrintSkipped {
		t.Error("expected print_skipped=false when printer succeeds")
	}
	if !p.called {
		t.Error("expected printer.Print to be called")
	}
}

// TestIntakePrinterErrNoDevice: mock printer returns ErrNoDevice — print_skipped=true, still 201.
func TestIntakePrinterErrNoDevice(t *testing.T) {
	orch := defaultOrchResult(0.95)
	nb := defaultNetBox()
	p := &mockPrinter{returnErr: fmt.Errorf("printer: no device found matching VID/PID")}
	h := handlers.NewIntakeHandler(orch, nb, &mockCatalogUpdater{}, &mockWAQ{}, 1, 1, 1, false, 0.90, p)

	req := buildMultipartRequest(t, 1)
	rec := httptest.NewRecorder()
	h.ServeHTTP(rec, req)

	if rec.Code != http.StatusCreated {
		t.Errorf("expected 201, got %d: body=%s", rec.Code, rec.Body.String())
	}
	var resp handlers.IntakeResponse
	if err := json.NewDecoder(rec.Body).Decode(&resp); err != nil {
		t.Fatalf("decode response: %v", err)
	}
	if !resp.PrintSkipped {
		t.Error("expected print_skipped=true when printer returns error")
	}
}

// TestIntakeNilPrinter: nil printer — print_skipped=true, no panic, 201.
func TestIntakeNilPrinter(t *testing.T) {
	orch := defaultOrchResult(0.95)
	nb := defaultNetBox()
	h := handlers.NewIntakeHandler(orch, nb, &mockCatalogUpdater{}, &mockWAQ{}, 1, 1, 1, false, 0.90, nil)

	req := buildMultipartRequest(t, 1)
	rec := httptest.NewRecorder()
	h.ServeHTTP(rec, req)

	if rec.Code != http.StatusCreated {
		t.Errorf("expected 201, got %d: body=%s", rec.Code, rec.Body.String())
	}
	var resp handlers.IntakeResponse
	if err := json.NewDecoder(rec.Body).Decode(&resp); err != nil {
		t.Fatalf("decode response: %v", err)
	}
	if !resp.PrintSkipped {
		t.Error("expected print_skipped=true when printer is nil")
	}
}

// TestIntakePrinterErrorNotFatal: printer error does not cause 500 — device was created, 201 returned.
func TestIntakePrinterErrorNotFatal(t *testing.T) {
	orch := defaultOrchResult(0.95)
	nb := defaultNetBox()
	p := &mockPrinter{returnErr: fmt.Errorf("some unexpected printer error")}
	h := handlers.NewIntakeHandler(orch, nb, &mockCatalogUpdater{}, &mockWAQ{}, 1, 1, 1, false, 0.90, p)

	req := buildMultipartRequest(t, 1)
	rec := httptest.NewRecorder()
	h.ServeHTTP(rec, req)

	if rec.Code != http.StatusCreated {
		t.Errorf("expected 201 even with printer error, got %d: body=%s", rec.Code, rec.Body.String())
	}
	var resp handlers.IntakeResponse
	if err := json.NewDecoder(rec.Body).Decode(&resp); err != nil {
		t.Fatalf("decode response: %v", err)
	}
	if !resp.PrintSkipped {
		t.Error("expected print_skipped=true when printer returns error")
	}
	if resp.NetBoxID == 0 {
		t.Error("expected netbox_id to be set (device was created)")
	}
}