package main

import (
	"fmt"
	"strings"
	"time"

	"github.com/beanzilla/gonode"
)

type Date struct {
	N     *gonode.Node `json:"-"`
	Day   int          `json:"day"`
	Month int          `json:"month"`
	Year  int          `json:"year"`
}

func (d *Date) String() string {
	month := time.Month(d.Month)
	return fmt.Sprintf("%s %d, %d", month.String(), d.Day, d.Year)
}

func (d *Date) Parse(n *gonode.Node) error {
	txt := fmt.Sprintf("%v", n.Data())
	if !strings.HasPrefix(txt, "date") {
		return fmt.Errorf("node doesn't contain correct information, expected 'date ## ## ####' got '%s'", txt)
	}
	parts := strings.Split(txt, " ")
	if len(parts) < 4 {
		return fmt.Errorf("expected no less than 4 parts, got %d %v", len(parts), parts)
	}

	// 'date' parts[0] (Ignore this)
	// day parts[1]
	if !IsInt(parts[1]) {
		return fmt.Errorf("day is invalid, '%s'", parts[1])
	}
	d.Day = ValueInt(parts[1])
	// month parts[2]
	if !IsInt(parts[2]) {
		return fmt.Errorf("month is invalid, '%s'", parts[2])
	}
	d.Month = ValueInt(parts[2])
	// year parts[3]
	if !IsInt(parts[3]) {
		return fmt.Errorf("year is invalid, '%s'", parts[3])
	}
	d.Year = ValueInt(parts[3])

	d.N = n

	return nil
}

func (d *Date) Update() error {
	if d.N == nil {
		return fmt.Errorf("no node associated, can't update")
	}
	d.N.SetData(fmt.Sprintf("date %d %d %d", d.Day, d.Month, d.Year))
	return nil
}