package collector

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

	"git.tornberg.me/go-otel/internal/storage"
	"git.tornberg.me/go-otel/internal/websocket"
)

type mockStore struct {
	entries []websocket.HistoryEntry
}

func (m *mockStore) Append(ctx context.Context, entry websocket.HistoryEntry) error {
	m.entries = append(m.entries, entry)
	return nil
}

func (m *mockStore) GetHistory(ctx context.Context, limit int) ([]websocket.HistoryEntry, error) {
	return m.entries, nil
}

func (m *mockStore) Search(ctx context.Context, opts storage.SearchOptions, limit int) ([]websocket.HistoryEntry, error) {
	var filtered []websocket.HistoryEntry
	for _, e := range m.entries {
		if opts.Type != "" && e.Type != opts.Type {
			continue
		}
		if opts.Query != "" && !strings.Contains(string(e.Data), opts.Query) {
			continue
		}
		filtered = append(filtered, e)
	}
	return filtered, nil
}

func TestCollectorWithStore(t *testing.T) {
	store := &mockStore{}
	coll := New(nil, 10, store)

	coll.addToHistory(websocket.DataTypeLogs, json.RawMessage(`{"msg": "test"}`))

	// Give it a moment since it's asynchronous
	timeout := time.After(100 * time.Millisecond)
	for {
		select {
		case <-timeout:
			t.Fatal("timed out waiting for entry to be appended to store")
		default:
			if len(store.entries) > 0 {
				goto OK
			}
			time.Sleep(10 * time.Millisecond)
		}
	}

OK:
	if store.entries[0].Type != "logs" {
		t.Errorf("expected type 'logs', got %s", store.entries[0].Type)
	}
}

func TestCollectorHistoryLimit(t *testing.T) {
	coll := New(nil, 10, nil)

	for i := 0; i < 10; i++ {
		coll.addToHistory(websocket.DataTypeLogs, json.RawMessage(`{"msg": "test"}`))
	}

	history := coll.GetHistory(10)
	if len(history) != 10 {
		t.Errorf("expected 10 entries, got %d", len(history))
	}

	history = coll.GetHistory(5)
	if len(history) != 5 {
		t.Errorf("expected 5 entries, got %d", len(history))
	}

	// Should default to historySize (10)
	history = coll.GetHistory(0)
	if len(history) != 10 {
		t.Errorf("expected default limit to be historySize (10), got %d", len(history))
	}

	// Should not crash on large limit, just return what it has
	history = coll.GetHistory(100)
	if len(history) != 10 {
		t.Errorf("expected 10 entries even with limit 100, got %d", len(history))
	}
}

func TestHandleHistoryByTypeUsesStore(t *testing.T) {
	store := &mockStore{
		entries: []websocket.HistoryEntry{
			{Type: "traces", Timestamp: 1, Data: json.RawMessage(`{"id":1}`)},
			{Type: "traces", Timestamp: 2, Data: json.RawMessage(`{"id":2}`)},
			{Type: "logs", Timestamp: 3, Data: json.RawMessage(`{"id":3}`)},
		},
	}
	// Ring buffer is much smaller than the store's content, so a correct
	// implementation must route through the store rather than the ring buffer.
	coll := New(nil, 1, store)

	req := httptest.NewRequest(http.MethodGet, "/api/history/traces", nil)
	rec := httptest.NewRecorder()
	coll.HandleHistoryByType("traces")(rec, req)

	var results []websocket.HistoryEntry
	if err := json.Unmarshal(rec.Body.Bytes(), &results); err != nil {
		t.Fatalf("failed to decode response: %v", err)
	}
	if len(results) != 2 {
		t.Fatalf("expected 2 trace entries from the store, got %d", len(results))
	}
}

func TestHandleTraceByID(t *testing.T) {
	store := &mockStore{
		entries: []websocket.HistoryEntry{
			{Type: "traces", Timestamp: 1, Data: json.RawMessage(`{"traceId":"abc123"}`)},
			{Type: "logs", Timestamp: 2, Data: json.RawMessage(`{"traceId":"abc123","msg":"related"}`)},
			{Type: "traces", Timestamp: 3, Data: json.RawMessage(`{"traceId":"other"}`)},
		},
	}
	coll := New(nil, 10, store)

	req := httptest.NewRequest(http.MethodGet, "/api/traces/abc123", nil)
	req.SetPathValue("traceId", "abc123")
	rec := httptest.NewRecorder()
	coll.HandleTraceByID(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("expected 200, got %d: %s", rec.Code, rec.Body.String())
	}

	var results []websocket.HistoryEntry
	if err := json.Unmarshal(rec.Body.Bytes(), &results); err != nil {
		t.Fatalf("failed to decode response: %v", err)
	}
	if len(results) != 2 {
		t.Fatalf("expected 2 entries referencing trace abc123, got %d", len(results))
	}
}

func TestHandleWaitRateLimited(t *testing.T) {
	coll := New(nil, 10, nil)

	var lastCode int
	for i := 0; i < 10; i++ {
		req := httptest.NewRequest(http.MethodGet, "/api/history/wait?q=nope&timeout=0", nil)
		req.RemoteAddr = "203.0.113.1:12345"
		rec := httptest.NewRecorder()
		coll.HandleWait(rec, req)
		lastCode = rec.Code
		if lastCode == http.StatusTooManyRequests {
			break
		}
	}
	if lastCode != http.StatusTooManyRequests {
		t.Fatalf("expected rate limiting to eventually return 429, last code was %d", lastCode)
	}
}