// Vikunja is a to-do list application to facilitate your life.
// Copyright 2018-present Vikunja and contributors. All rights reserved.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

package events

import (
	"encoding/json"
	"testing"

	"github.com/ThreeDotsLabs/watermill"
	"github.com/ThreeDotsLabs/watermill/message"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

var (
	isUnderTest          bool
	dispatchedTestEvents []Event
)

// Fake sets up the "test mode" of the events package. Typically you'd call this function in the TestMain function
// in the package you're testing. It will prevent any events from being fired, instead they will be recorded and be
// available for assertions.
func Fake() {
	isUnderTest = true
	dispatchedTestEvents = nil
}

// AssertDispatched asserts an event has been dispatched.
func AssertDispatched(t *testing.T, event Event) {
	var found bool
	for _, testEvent := range dispatchedTestEvents {
		if event.Name() == testEvent.Name() {
			found = true
			break
		}
	}

	assert.True(t, found, "Failed to assert "+event.Name()+" has been dispatched.")
}

// TestListener takes an event and a listener and calls the listener's Handle method.
func TestListener(t *testing.T, event Event, listener Listener) {
	content, err := json.Marshal(event)
	require.NoError(t, err)

	msg := message.NewMessage(watermill.NewUUID(), content)
	err = listener.Handle(msg)
	require.NoError(t, err)
}

// ClearDispatchedEvents clears the list of dispatched test events. This is useful when you want to
// test event dispatch counts in a specific section of code without events from previous test operations.
func ClearDispatchedEvents() {
	dispatchedTestEvents = nil
}

// CountDispatchedEvents counts how many events of a specific type have been dispatched.
func CountDispatchedEvents(eventName string) int {
	count := 0
	for _, testEvent := range dispatchedTestEvents {
		if testEvent.Name() == eventName {
			count++
		}
	}
	return count
}