package ajax

import (
	"encoding/json"
	"errors"
	"fmt"
	"local/todo-server/server/ajax/form"
	"local/todo-server/server/ajax/task"
	"net/http"
	"strings"
)

func (a *Ajax) loadTasks(w http.ResponseWriter, r *http.Request) error {
	listID, _, _ := a.Cur(r)
	filterComplete := func(t *task.Task) bool {
		if form.Get(r, "compl") == "" {
			return true
		}
		return t.Complete == (form.Get(r, "compl") != "0")
	}
	filterTags := func(t *task.Task) bool {
		if form.Get(r, "t") == "" {
			return true
		}
		whitelistTags := form.ToStrArr(form.Get(r, "t"))
		if len(whitelistTags) == 0 {
			return true
		}
		whitelistTagMap := make(map[string]struct{})
		for _, tag := range whitelistTags {
			whitelistTagMap[tag] = struct{}{}
		}
		for _, tag := range t.Tags {
			if _, ok := whitelistTagMap[tag]; ok {
				return true
			}
		}
		return false
	}
	filterSubstr := func(t *task.Task) bool {
		substr := form.Get(r, "s")
		return substr == "" || strings.Contains(fmt.Sprintf("%+v", t), substr)
	}
	tasks, err := a.storageListTasks(listID, filterComplete, filterTags, filterSubstr)
	if err != nil {
		return err
	}
	return json.NewEncoder(w).Encode(map[string]interface{}{"list": tasks})
}

func (a *Ajax) newTask(w http.ResponseWriter, r *http.Request) error {
	listID, task, err := a.makeTask(r)
	if err != nil {
		return err
	}
	return a.storageSetTask(listID, task.UUID, task)
}

func (a *Ajax) makeTask(r *http.Request) (string, *task.Task, error) {
	listID, _, tags := a.Cur(r)
	task, err := task.New(r)
	if err != nil {
		return "", nil, err
	}
	task.AppendTags(tags)
	return listID, task, nil
}

func (a *Ajax) deleteTask(w http.ResponseWriter, r *http.Request) error {
	listID, taskID, _ := a.Cur(r)
	return a.storageDelTask(listID, taskID)
}

func (a *Ajax) completeTask(w http.ResponseWriter, r *http.Request) error {
	listID, taskID, _ := a.Cur(r)
	task, err := a.storageGetTask(listID, taskID)
	if err != nil {
		return err
	}
	task.SetComplete(form.Get(r, "compl") == "1")
	return a.storageSetTask(listID, taskID, task)
}

func (a *Ajax) editNote(w http.ResponseWriter, r *http.Request) error {
	listID, taskID, _ := a.Cur(r)
	task, err := a.storageGetTask(listID, taskID)
	if err != nil {
		return err
	}
	task.SetNote(form.Get(r, "note"))
	return a.storageSetTask(listID, taskID, task)
}

func (a *Ajax) editTask(w http.ResponseWriter, r *http.Request) error {
	listID, task, err := a.makeTask(r)
	if err != nil {
		return err
	}
	_, taskID, _ := a.Cur(r)
	task.UUID = taskID
	task.ID = task.UUID
	return a.storageSetTask(listID, task.UUID, task)
}

func (a *Ajax) setPrio(w http.ResponseWriter, r *http.Request) error {
	listID, taskID, _ := a.Cur(r)
	task, err := a.storageGetTask(listID, taskID)
	if err != nil {
		return err
	}
	task.SetPrio(form.ToInt(form.Get(r, "prio")))
	return a.storageSetTask(listID, taskID, task)
}

func (a *Ajax) moveTask(w http.ResponseWriter, r *http.Request) error {
	listID, taskID, _ := a.Cur(r)
	toList := form.Get(r, "to")
	task, err := a.storageGetTask(listID, taskID)
	if err != nil {
		return err
	}
	a.storageSetTask(listID, taskID, nil)
	return a.storageSetTask(toList, taskID, task)
}

func (a *Ajax) parseTaskStr(w http.ResponseWriter, r *http.Request) error {
	return errors.New("not impl")
}