package scheduler

import (
	"context"
	"errors"
	"testing"
	"time"

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

func TestTask(t *testing.T) {
	ctx := context.Background()
	var i int

	task := NewTask(
		func(ctx context.Context) (any, error) {
			i += 1
			return nil, nil
		},
	)

	task.Run(ctx)

	assert.Equal(t, nil, task.res)
	assert.NotEmpty(t, task.updatedAt)
	assert.Equal(t, 1, i)
	assert.Equal(t, 1, int(task.GetAttempts()))
}

func TestAbortTask(t *testing.T) {
	ctx := context.Background()

	task := NewTask(
		func(ctx context.Context) (any, error) {
			<-ctx.Done()
			return nil, ctx.Err()
		},
	)

	timer := time.NewTicker(200 * time.Millisecond)
	go func() {
		<-timer.C
		task.Abort()
	}()
	task.Run(ctx)

	assert.Equal(t, Abort, task.GetState())
}

func TestTaskContextDone(t *testing.T) {
	ctx, fnCancel := context.WithCancel(context.Background())

	task := NewTask(
		func(ctx context.Context) (any, error) {
			<-ctx.Done()
			return nil, ctx.Err()
		},
	)

	timer := time.NewTicker(200 * time.Millisecond)
	go func() {
		<-timer.C
		fnCancel()
	}()
	task.Run(ctx)

	assert.Equal(t, Failed, task.GetState())
}

func TestTaskFnSuccess(t *testing.T) {
	ctx := context.Background()
	var result int

	task := NewTask(
		func(ctx context.Context) (any, error) {
			return 3, nil
		},
		WithFnSuccess(func(ctx context.Context, res any) {
			t, ok := res.(int)
			if !ok {
				return
			}

			result = t * 2
		}),
	)

	task.Run(ctx)

	assert.Equal(t, Success, task.GetState())
	assert.Equal(t, 6, result)
}

func TestTaskFnError(t *testing.T) {
	ctx := context.Background()
	var result error

	task := NewTask(
		func(ctx context.Context) (any, error) {
			return 3, errors.New("error occurred...")
		},
		WithFnError(func(ctx context.Context, err error) {
			result = err
		}),
	)

	task.Run(ctx)

	assert.Equal(t, Failed, task.GetState())
	assert.Equal(t, "error occurred...", result.Error())
}

func TestTaskWithErrJobNotCompletedYet(t *testing.T) {
	ctx := context.Background()
	var attempts int

	task := NewTask(
		func(ctx context.Context) (any, error) {
			if attempts < 2 {
				attempts += 1
				return nil, ErrJobNotCompletedYet
			}
			return "ok", nil
		},
	)

	for i := 0; i < 2; i++ {
		task.Run(ctx)
		assert.Equal(t, Pending, task.GetState())
	}

	task.Run(ctx)
	assert.Equal(t, Success, task.GetState())
	assert.Equal(t, 3, int(task.GetAttempts()))
}

func TestTaskTimeExceeded(t *testing.T) {
	ctx := context.Background()

	task := NewTask(
		func(ctx context.Context) (any, error) {
			return "ko", nil
		},
		WithMaxDuration(5*time.Millisecond),
	)

	time.Sleep(10 * time.Millisecond)

	task.Run(ctx)
	assert.Equal(t, Failed, task.GetState())
	assert.Equal(t, 0, int(task.GetAttempts()))
}

func TestTaskExecTimeout(t *testing.T) {
	ctx := context.Background()

	task := NewTask(
		func(ctx context.Context) (any, error) {
			<-ctx.Done()
			return nil, ctx.Err()
		},
		WithExecTimeout(5*time.Millisecond),
	)

	time.Sleep(10 * time.Millisecond)

	task.Run(ctx)
	assert.Equal(t, Failed, task.GetState())
	assert.Equal(t, 1, int(task.GetAttempts()))
}

func TestTaskDetails(t *testing.T) {
	ctx := context.Background()

	task := NewTask(
		func(ctx context.Context) (any, error) {
			return "coucou", nil
		},
	)

	details := task.IntoDetails()

	assert.Equal(t, 0, int(details.Attempts))
	assert.Equal(t, "pending", details.State)
	assert.False(t, details.CreatedAt.IsZero())
	assert.Empty(t, details.UpdatedAt)
	assert.Nil(t, details.MaxDuration)
	assert.Empty(t, details.Err)
	assert.NotEmpty(t, details.ElapsedTime)

	task.Run(ctx)

	details = task.IntoDetails()

	assert.Equal(t, 1, int(details.Attempts))
	assert.Equal(t, "success", details.State)
	assert.False(t, details.CreatedAt.IsZero())
	assert.NotEmpty(t, details.UpdatedAt)
	assert.Nil(t, details.MaxDuration)
	assert.Empty(t, details.Err)
	assert.NotEmpty(t, details.ElapsedTime)
}

func TestTaskAdditionalInfos(t *testing.T) {
	t.Run("with key value", func(t *testing.T) {
		elementID := uuid.NewString()
		task := NewTask(
			func(ctx context.Context) (any, error) {
				return "yo", nil
			},
			WithAdditionalInfos("transportId", elementID),
			WithAdditionalInfos("element", "transport"),
		)

		assert.Equal(t, elementID, task.additionalInfos["transportId"])
		assert.Equal(t, "transport", task.additionalInfos["element"])
	})

	t.Run("with empty key", func(t *testing.T) {
		elementID := uuid.NewString()
		task := NewTask(
			func(ctx context.Context) (any, error) {
				return "hello", nil
			},
			WithAdditionalInfos("", elementID),
			WithAdditionalInfos("element", "transport"),
		)

		assert.Equal(t, "transport", task.additionalInfos["element"])
	})

	t.Run("with empty infos", func(t *testing.T) {
		task := NewTask(
			func(ctx context.Context) (any, error) {
				return "hey", nil
			},
		)

		assert.Nil(t, task.additionalInfos)
	})
}