package task

import (
	"fmt"
	"sync"
	"time"

	cron "github.com/robfig/cron/v3"
	"github.com/rs/xid"
	"kumoly.io/kumoly/app/util"
)

var stlok sync.Mutex

var tasks = map[string]*Task{}

func AddTask(t *Task) {
	stlok.Lock()
	defer stlok.Unlock()
	if t.ID == "" {
		l.Warn().Str("task_id", t.ID).Msg("no ID, using random id")
		t.ID = xid.New().String()
	}
	_, ok := tasks[t.ID]
	if ok {
		l.Warn().Str("task_id", t.ID).Msg("task is already in store, skipping")
	} else {
		tasks[t.ID] = t
	}
}

func GetTasks() map[string]*Task {
	return tasks
}

func GetTask(id string) *Task {
	return tasks[id]
}

func NewTask() *Task {
	return &Task{
		ID: xid.New().String(),
	}
}

func RunFunc(spec string, cmd func()) error {
	th := &Task{
		ID:   xid.New().String(),
		Func: func(carry *interface{}, i ...interface{}) error { cmd(); return nil },
	}
	t := &_task{Task: th, spec: spec, name: util.Caller(2)}
	id, err := c.AddJob(spec, t)
	t.id = id
	return err
}

func AddAndRunTask(spec string, t *Task, args ...interface{}) error {
	AddTask(t)
	_t := &_task{Task: t, args: args, spec: spec, name: t.ID}
	id, err := c.AddJob(spec, _t)
	_t.id = id
	return err
}

func RunTask(spec, id, name string, args ...interface{}) error {
	t := GetTask(id)
	if t == nil {
		return fmt.Errorf("no task with id")
	}
	_t := &_task{Task: t, args: args, spec: spec, name: name}
	_id, err := c.AddJob(spec, _t)
	_t.id = _id
	return err
}

func RunTaskAt(at time.Time, id, name string, args ...interface{}) error {
	next := time.Until(at).Round(time.Second)
	if next < 0 {
		return fmt.Errorf("%v is passed by %s", at, next)
	}
	t := GetTask(id)
	if t == nil {
		return fmt.Errorf("no task with id")
	}
	spec := "@every " + next.String()
	_t := &_task{Task: t, args: args, spec: spec, once: true, name: name}
	_id, err := c.AddJob(spec, _t)
	_t.id = _id
	return err
}

func RunTaskAfter(d time.Duration, id, name string, args ...interface{}) error {
	t := GetTask(id)
	if t == nil {
		return fmt.Errorf("no task with id")
	}
	spec := "@every " + d.String()
	_t := &_task{Task: t, args: args, spec: spec, once: true, name: name}
	_id, err := c.AddJob(spec, _t)
	_t.id = _id
	return err
}

func Remove(id cron.EntryID) {
	c.Remove(id)
}