package input

import (
	"strconv"

	"github.com/vugu/vugu"
	"golang.org/x/exp/slices"
)

// Tags provides a way for the user to add/remove entries from a slice.
type Tags struct {
	AttrMap vugu.AttrMap

	Bind ListBinder // Binds the shown tags to some slice.

	fieldValue string
}

func (c *Tags) keyValuePairs() []ListKeyValuePair {
	if c.Bind == nil {
		return nil
	}

	return c.Bind.ListKeyValuePairs()
}

func (c *Tags) handleButtonAdd(event vugu.DOMEvent) {
	if c.Bind == nil {
		return
	}

	// Don't allow empty entries.
	if c.fieldValue == "" {
		return
	}

	// Don't allow duplicate entries.
	values := c.Bind.ListKeyValuePairs()
	if slices.ContainsFunc(values, func(k ListKeyValuePair) bool { return k.Value == c.fieldValue }) {
		return
	}

	c.Bind.ListAddKeyValuePair(strconv.Itoa(c.Bind.ListLen()), c.fieldValue)
}

func (c *Tags) handleButtonDelete(event vugu.DOMEvent, index int) {
	if c.Bind == nil {
		return
	}

	c.Bind.ListDeleteKey(strconv.Itoa(index))
}