package storage

import (
	"os"
	"sync"
	"testing"
)

func TestStore_InsertAndCount(t *testing.T) {
	dbFile := "test_telegram.db"
	defer os.Remove(dbFile)

	s, err := New(dbFile, true)
	if err != nil {
		t.Fatalf("New() failed: %v", err)
	}
	defer s.Close()

	if err := s.Insert("ZCZC TEST NNNN"); err != nil {
		t.Fatalf("Insert() failed: %v", err)
	}

	count, err := s.CountUnprocessed()
	if err != nil {
		t.Fatalf("CountUnprocessed() failed: %v", err)
	}
	if count != 1 {
		t.Errorf("expected 1 unprocessed, got %d", count)
	}
}

func TestStore_LoadUnprocessed(t *testing.T) {
	dbFile := "test_load.db"
	defer os.Remove(dbFile)

	s, err := New(dbFile, true)
	if err != nil {
		t.Fatalf("New() failed: %v", err)
	}
	defer s.Close()

	s.Insert("ZCZC MSG1 NNNN")
	s.Insert("ZCZC MSG2 NNNN")

	telegrams, err := s.LoadUnprocessed()
	if err != nil {
		t.Fatalf("LoadUnprocessed() failed: %v", err)
	}
	if len(telegrams) != 2 {
		t.Errorf("expected 2 telegrams, got %d", len(telegrams))
	}
}

func TestStore_MarkProcessed(t *testing.T) {
	dbFile := "test_mark.db"
	defer os.Remove(dbFile)

	s, err := New(dbFile, true)
	if err != nil {
		t.Fatalf("New() failed: %v", err)
	}
	defer s.Close()

	s.Insert("ZCZC TEST NNNN")

	telegrams, _ := s.LoadUnprocessed()
	if len(telegrams) != 1 {
		t.Fatalf("expected 1 telegram, got %d", len(telegrams))
	}

	if err := s.MarkProcessed(telegrams[0].ID); err != nil {
		t.Fatalf("MarkProcessed() failed: %v", err)
	}

	count, _ := s.CountUnprocessed()
	if count != 0 {
		t.Errorf("expected 0 unprocessed after marking, got %d", count)
	}
}

func TestStore_Empty(t *testing.T) {
	dbFile := "test_empty.db"
	defer os.Remove(dbFile)

	s, err := New(dbFile, true)
	if err != nil {
		t.Fatalf("New() failed: %v", err)
	}
	defer s.Close()

	telegrams, err := s.LoadUnprocessed()
	if err != nil {
		t.Fatalf("LoadUnprocessed() failed: %v", err)
	}
	if len(telegrams) != 0 {
		t.Errorf("expected 0 telegrams, got %d", len(telegrams))
	}
}

func TestStore_ConcurrentInsert(t *testing.T) {
	dbFile := "test_concurrent.db"
	defer os.Remove(dbFile)

	s, err := New(dbFile, true)
	if err != nil {
		t.Fatalf("New() failed: %v", err)
	}
	defer s.Close()

	var wg sync.WaitGroup
	const numGoroutines = 10
	const insertsPerGoroutine = 10

	for i := 0; i < numGoroutines; i++ {
		wg.Add(1)
		go func(id int) {
			defer wg.Done()
			for j := 0; j < insertsPerGoroutine; j++ {
				telegram := "ZCZC CONCURRENT MSG"
				if err := s.Insert(telegram); err != nil {
					t.Errorf("concurrent Insert() failed: %v", err)
				}
			}
		}(i)
	}
	wg.Wait()

	count, err := s.CountUnprocessed()
	if err != nil {
		t.Fatalf("CountUnprocessed() after concurrent inserts failed: %v", err)
	}
	expected := int64(numGoroutines * insertsPerGoroutine)
	if count != expected {
		t.Errorf("expected %d unprocessed, got %d", expected, count)
	}
}

func TestStore_CloseAndReopen(t *testing.T) {
	dbFile := "test_reopen.db"
	defer os.Remove(dbFile)

	// Create and insert
	s, err := New(dbFile, true)
	if err != nil {
		t.Fatalf("New() failed: %v", err)
	}
	if err := s.Insert("ZCZC PERSIST NNNN"); err != nil {
		t.Fatalf("Insert() failed: %v", err)
	}
	s.Close()

	// Reopen without init flag
	s2, err := New(dbFile, false)
	if err != nil {
		t.Fatalf("New() reopen failed: %v", err)
	}
	defer s2.Close()

	count, err := s2.CountUnprocessed()
	if err != nil {
		t.Fatalf("CountUnprocessed() on reopened db failed: %v", err)
	}
	if count != 1 {
		t.Errorf("expected 1 unprocessed after reopen, got %d", count)
	}
}

func TestStore_InitClearsDatabase(t *testing.T) {
	dbFile := "test_init_clear.db"
	defer os.Remove(dbFile)

	// Create and insert
	s, err := New(dbFile, false)
	if err != nil {
		t.Fatalf("New() failed: %v", err)
	}
	s.Insert("ZCZC WILL BE CLEARED NNNN")
	s.Close()

	// Reopen with init=true (should recreate)
	s2, err := New(dbFile, true)
	if err != nil {
		t.Fatalf("New() with init=true failed: %v", err)
	}
	defer s2.Close()

	count, err := s2.CountUnprocessed()
	if err != nil {
		t.Fatalf("CountUnprocessed() failed: %v", err)
	}
	if count != 0 {
		t.Errorf("expected 0 unprocessed after init, got %d", count)
	}
}