package receiver

import (
	"bytes"
	"encoding/json"
	"io"
	"log/slog"
	"net/http"
	"net/http/httptest"
	"path/filepath"
	"testing"

	"edp.buildth.ing/DevFW-CICD/forgejo-runner-resource-collector/internal/summary"
)

func TestHandler_ReceiveMetrics(t *testing.T) {
	h, cleanup := newTestHandler(t)
	defer cleanup()

	payload := MetricsPayload{
		Execution: ExecutionContext{
			Organization: "test-org",
			Repository:   "test-repo",
			Workflow:     "ci.yml",
			Job:          "build",
			RunID:        "run-123",
		},
		Summary: summary.RunSummary{
			DurationSeconds: 60.0,
			SampleCount:     12,
		},
	}

	body, _ := json.Marshal(payload)
	req := httptest.NewRequest(http.MethodPost, "/api/v1/metrics", bytes.NewReader(body))
	req.Header.Set("Content-Type", "application/json")
	rec := httptest.NewRecorder()

	mux := http.NewServeMux()
	h.RegisterRoutes(mux)
	mux.ServeHTTP(rec, req)

	if rec.Code != http.StatusCreated {
		t.Errorf("status = %d, want %d", rec.Code, http.StatusCreated)
	}

	var resp map[string]any
	if err := json.NewDecoder(rec.Body).Decode(&resp); err != nil {
		t.Fatalf("failed to decode response: %v", err)
	}
	if resp["status"] != "created" {
		t.Errorf("response status = %v, want %q", resp["status"], "created")
	}
	if resp["id"] == nil || resp["id"].(float64) == 0 {
		t.Error("response id is missing or zero")
	}
}

func TestHandler_ReceiveMetrics_InvalidJSON(t *testing.T) {
	h, cleanup := newTestHandler(t)
	defer cleanup()

	req := httptest.NewRequest(http.MethodPost, "/api/v1/metrics", bytes.NewReader([]byte("not json")))
	rec := httptest.NewRecorder()

	mux := http.NewServeMux()
	h.RegisterRoutes(mux)
	mux.ServeHTTP(rec, req)

	if rec.Code != http.StatusBadRequest {
		t.Errorf("status = %d, want %d", rec.Code, http.StatusBadRequest)
	}
}

func TestHandler_ReceiveMetrics_MissingRunID(t *testing.T) {
	h, cleanup := newTestHandler(t)
	defer cleanup()

	payload := MetricsPayload{
		Execution: ExecutionContext{
			Organization: "test-org",
			Repository:   "test-repo",
			// RunID is missing
		},
		Summary: summary.RunSummary{},
	}

	body, _ := json.Marshal(payload)
	req := httptest.NewRequest(http.MethodPost, "/api/v1/metrics", bytes.NewReader(body))
	rec := httptest.NewRecorder()

	mux := http.NewServeMux()
	h.RegisterRoutes(mux)
	mux.ServeHTTP(rec, req)

	if rec.Code != http.StatusBadRequest {
		t.Errorf("status = %d, want %d", rec.Code, http.StatusBadRequest)
	}
}

func TestHandler_GetByRunID(t *testing.T) {
	h, cleanup := newTestHandler(t)
	defer cleanup()

	// First, save a metric
	payload := &MetricsPayload{
		Execution: ExecutionContext{
			Organization: "test-org",
			Repository:   "test-repo",
			Workflow:     "ci.yml",
			Job:          "build",
			RunID:        "run-get-test",
		},
		Summary: summary.RunSummary{SampleCount: 5},
	}
	if _, err := h.store.SaveMetric(payload); err != nil {
		t.Fatalf("SaveMetric() error = %v", err)
	}

	req := httptest.NewRequest(http.MethodGet, "/api/v1/metrics/run/run-get-test", nil)
	rec := httptest.NewRecorder()

	mux := http.NewServeMux()
	h.RegisterRoutes(mux)
	mux.ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Errorf("status = %d, want %d", rec.Code, http.StatusOK)
	}

	var metrics []Metric
	if err := json.NewDecoder(rec.Body).Decode(&metrics); err != nil {
		t.Fatalf("failed to decode response: %v", err)
	}
	if len(metrics) != 1 {
		t.Errorf("got %d metrics, want 1", len(metrics))
	}
	if metrics[0].RunID != "run-get-test" {
		t.Errorf("RunID = %q, want %q", metrics[0].RunID, "run-get-test")
	}
}

func TestHandler_GetByRunID_NotFound(t *testing.T) {
	h, cleanup := newTestHandler(t)
	defer cleanup()

	req := httptest.NewRequest(http.MethodGet, "/api/v1/metrics/run/nonexistent", nil)
	rec := httptest.NewRecorder()

	mux := http.NewServeMux()
	h.RegisterRoutes(mux)
	mux.ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Errorf("status = %d, want %d", rec.Code, http.StatusOK)
	}

	var metrics []Metric
	if err := json.NewDecoder(rec.Body).Decode(&metrics); err != nil {
		t.Fatalf("failed to decode response: %v", err)
	}
	if len(metrics) != 0 {
		t.Errorf("got %d metrics, want 0", len(metrics))
	}
}

func TestHandler_GetByRepository(t *testing.T) {
	h, cleanup := newTestHandler(t)
	defer cleanup()

	// Save metrics for different repos
	payloads := []*MetricsPayload{
		{Execution: ExecutionContext{Organization: "org-x", Repository: "repo-y", RunID: "r1"}},
		{Execution: ExecutionContext{Organization: "org-x", Repository: "repo-y", RunID: "r2"}},
		{Execution: ExecutionContext{Organization: "org-x", Repository: "repo-z", RunID: "r3"}},
	}
	for _, p := range payloads {
		if _, err := h.store.SaveMetric(p); err != nil {
			t.Fatalf("SaveMetric() error = %v", err)
		}
	}

	req := httptest.NewRequest(http.MethodGet, "/api/v1/metrics/repo/org-x/repo-y", nil)
	rec := httptest.NewRecorder()

	mux := http.NewServeMux()
	h.RegisterRoutes(mux)
	mux.ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Errorf("status = %d, want %d", rec.Code, http.StatusOK)
	}

	var metrics []Metric
	if err := json.NewDecoder(rec.Body).Decode(&metrics); err != nil {
		t.Fatalf("failed to decode response: %v", err)
	}
	if len(metrics) != 2 {
		t.Errorf("got %d metrics, want 2", len(metrics))
	}
}

func TestHandler_Health(t *testing.T) {
	h, cleanup := newTestHandler(t)
	defer cleanup()

	req := httptest.NewRequest(http.MethodGet, "/health", nil)
	rec := httptest.NewRecorder()

	mux := http.NewServeMux()
	h.RegisterRoutes(mux)
	mux.ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Errorf("status = %d, want %d", rec.Code, http.StatusOK)
	}

	var resp map[string]string
	if err := json.NewDecoder(rec.Body).Decode(&resp); err != nil {
		t.Fatalf("failed to decode response: %v", err)
	}
	if resp["status"] != "ok" {
		t.Errorf("status = %q, want %q", resp["status"], "ok")
	}
}

func newTestHandler(t *testing.T) (*Handler, func()) {
	t.Helper()
	dbPath := filepath.Join(t.TempDir(), "test.db")
	store, err := NewStore(dbPath)
	if err != nil {
		t.Fatalf("NewStore() error = %v", err)
	}

	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
	handler := NewHandler(store, logger)

	return handler, func() { _ = store.Close() }
}