package recovery

import (
	"errors"
	"path/filepath"
	"testing"

	"github.com/stretchr/testify/assert"
)

func TestDeadletterQueue(t *testing.T) {
	tmpDir := t.TempDir()
	queuePath := filepath.Join(tmpDir, "deadletter.json")

	dq := NewDeadletterQueue(queuePath)

	item := &DeadletterItem{
		ID:          "task-1",
		Type:        "activity",
		WorkflowID:  "wf-1",
		Error:       "test error",
		AttemptCount: 1,
		MaxAttempts: 3,
		Recoverable: true,
	}

	// Add item
	err := dq.Add(item)
	assert.NoError(t, err)
	assert.Equal(t, 1, dq.Count())

	// Get item
	retrieved := dq.Get("task-1")
	assert.NotNil(t, retrieved)
	assert.Equal(t, "task-1", retrieved.ID)
	assert.NotZero(t, retrieved.CreatedAt)
	assert.NotZero(t, retrieved.UpdatedAt)

	// Remove item
	err = dq.Remove("task-1")
	assert.NoError(t, err)
	assert.Equal(t, 0, dq.Count())
}

func TestDeadletterQueuePersistence(t *testing.T) {
	tmpDir := t.TempDir()
	queuePath := filepath.Join(tmpDir, "deadletter.json")

	// Create and add item
	dq1 := NewDeadletterQueue(queuePath)
	item := &DeadletterItem{
		ID:           "task-1",
		Type:         "activity",
		WorkflowID:   "wf-1",
		Error:        "test error",
		Recoverable:  true,
	}
	err := dq1.Add(item)
	assert.NoError(t, err)

	// Create new queue instance and load
	dq2 := NewDeadletterQueue(queuePath)
	err = dq2.Load()
	assert.NoError(t, err)

	// Verify item was loaded
	assert.Equal(t, 1, dq2.Count())
	retrieved := dq2.Get("task-1")
	assert.NotNil(t, retrieved)
	assert.Equal(t, "task-1", retrieved.ID)
}

func TestDeadletterQueueGetAll(t *testing.T) {
	tmpDir := t.TempDir()
	queuePath := filepath.Join(tmpDir, "deadletter.json")

	dq := NewDeadletterQueue(queuePath)

	// Add multiple items
	for i := 1; i <= 3; i++ {
		item := &DeadletterItem{
			ID:         "task-" + string(rune(48+i)),
			Type:       "activity",
			WorkflowID: "wf-1",
			Error:      "error",
		}
		dq.Add(item)
	}

	all := dq.GetAll()
	assert.Equal(t, 3, len(all))
}

func TestDeadletterQueueGetRecoverable(t *testing.T) {
	tmpDir := t.TempDir()
	queuePath := filepath.Join(tmpDir, "deadletter.json")

	dq := NewDeadletterQueue(queuePath)

	// Add recoverable item
	dq.Add(&DeadletterItem{
		ID:          "task-1",
		Type:        "activity",
		WorkflowID:  "wf-1",
		Recoverable: true,
	})

	// Add non-recoverable item
	dq.Add(&DeadletterItem{
		ID:          "task-2",
		Type:        "activity",
		WorkflowID:  "wf-1",
		Recoverable: false,
	})

	recoverable := dq.GetRecoverable()
	assert.Equal(t, 1, len(recoverable))
	assert.Equal(t, "task-1", recoverable[0].ID)
}

func TestDeadletterQueueResolve(t *testing.T) {
	tmpDir := t.TempDir()
	queuePath := filepath.Join(tmpDir, "deadletter.json")

	dq := NewDeadletterQueue(queuePath)
	dq.Add(&DeadletterItem{
		ID:         "task-1",
		Type:       "activity",
		WorkflowID: "wf-1",
	})

	// Resolve item
	err := dq.Resolve("task-1", "manually recovered")
	assert.NoError(t, err)

	item := dq.Get("task-1")
	assert.NotNil(t, item)
	assert.Equal(t, "manually recovered", item.RecoveryNote)
}

func TestDeadletterQueueEmpty(t *testing.T) {
	tmpDir := t.TempDir()
	queuePath := filepath.Join(tmpDir, "deadletter.json")

	dq := NewDeadletterQueue(queuePath)
	assert.True(t, dq.IsEmpty())
	assert.Equal(t, 0, dq.Count())

	dq.Add(&DeadletterItem{ID: "task-1"})
	assert.False(t, dq.IsEmpty())
	assert.Equal(t, 1, dq.Count())
}

func TestCreateDeadletterItem(t *testing.T) {
	err := errors.New("test error")
	data := map[string]any{"key": "value"}

	item := CreateDeadletterItem("task-1", "activity", "wf-1", err, data, true)

	assert.Equal(t, "task-1", item.ID)
	assert.Equal(t, "activity", item.Type)
	assert.Equal(t, "wf-1", item.WorkflowID)
	assert.Equal(t, "test error", item.Error)
	assert.Equal(t, 1, item.AttemptCount)
	assert.Equal(t, 3, item.MaxAttempts)
	assert.True(t, item.Recoverable)
	assert.NotZero(t, item.CreatedAt)
	assert.NotZero(t, item.UpdatedAt)
}

func TestDeadletterQueueNoFile(t *testing.T) {
	tmpDir := t.TempDir()
	queuePath := filepath.Join(tmpDir, "nonexistent.json")

	dq := NewDeadletterQueue(queuePath)
	// Loading non-existent file should not error
	err := dq.Load()
	assert.NoError(t, err)
	assert.True(t, dq.IsEmpty())
}

func TestDeadletterRemoveNonexistent(t *testing.T) {
	tmpDir := t.TempDir()
	queuePath := filepath.Join(tmpDir, "deadletter.json")

	dq := NewDeadletterQueue(queuePath)
	// Removing non-existent item should not error
	err := dq.Remove("nonexistent")
	assert.NoError(t, err)
}

func TestDeadletterResolveNonexistent(t *testing.T) {
	tmpDir := t.TempDir()
	queuePath := filepath.Join(tmpDir, "deadletter.json")

	dq := NewDeadletterQueue(queuePath)
	// Resolving non-existent item should error
	err := dq.Resolve("nonexistent", "note")
	assert.Error(t, err)
}