package common_utils

import (
	"context"
	"errors"
	"fmt"
	"sync"
	"time"
)

func Retry(
	ctx context.Context,
	retryTimes int,
	waitBeforeRetry time.Duration,
	exec Task,
) (success bool, errs []error) {
	var err error
	errs = []error{}
	for i := 0; i < retryTimes; i++ {
		if err = exec(ctx); err == nil {
			return true, errs
		}
		errs = append(errs, err)
	}
	return false, errs
}

func ExecTask(ctx context.Context, tasks Task) error {
	errChan := make(chan error)
	go func() {
		errChan <- tasks(ctx)
	}()

	select {
	case err := <-errChan:
		return err
	case <-ctx.Done():
		return ctx.Err()
	}
}

// ExecTasks Runs each task in a separate goroutine
// To set no task timeout -- set taskTimeout to 0
func ExecTasks(ctx context.Context, taskTimeout time.Duration, tasks []Task) error {
	wg := &sync.WaitGroup{}
	errChan := make(chan error)
	wgChan := make(chan struct{})

	wg.Add(len(tasks))
	for i, task := range tasks {
		go func() {
			var cancel context.CancelFunc
			taskCtx := context.Background()
			if taskTimeout != 0 {
				taskCtx, cancel = context.WithTimeout(taskCtx, taskTimeout)
			}
			if err := task(taskCtx); err != nil {
				errChan <- errors.Join(fmt.Errorf("error running task %d: ", i), err)
			}
			wg.Done()
			cancel()
		}()
	}
	go func() {
		wg.Wait()
		close(wgChan)
	}()

	select {
	case <-ctx.Done():
		return ctx.Err()
	case <-wgChan:
		return nil
	case err := <-errChan:
		return err
	}
}

func Ternar[T any](condition bool, ifTrue T, ifFalse T) T {
	if condition {
		return ifTrue
	}
	return ifFalse
}

func Must(err error) {
	if err != nil {
		panic(err.Error())
	}
}