package gime

import (
	"errors"
	"time"

	"github.com/pborman/uuid"
)

// Entry is a time entry
type TimeEntry struct {
	uuid  string
	start time.Time
	end   time.Time
	tags  *TagCollection
}

// CreateTimeEntry creates an entry with the given parameters and returns it.
// An error is returned if no start time is given or if the end time given is
// non-zero and earlier than the start time.
func CreateTimeEntry(s, e time.Time, t *TagCollection) (*TimeEntry, error) {
	ret := new(TimeEntry)
	ret.uuid = uuid.New()
	if s.IsZero() {
		// No start time given, return error
		return ret, errors.New("No start time given")
	}
	ret.start = s
	if !e.IsZero() {
		if !e.After(s) {
			// Given end time is earlier than start time
			return ret, errors.New("End time is before start time")
		}
	}
	ret.end = e
	ret.tags = t
	return ret, nil
}

// GetUUID returns the UUID for the entry
func (t *TimeEntry) GetUUID() string {
	return t.uuid
}

// GetStart returns the start time for the entry
func (t *TimeEntry) GetStart() time.Time {
	return t.start
}

// SetStart sets the start time on the time entry
func (t *TimeEntry) SetStart(s time.Time) {
	t.start = s
}

// GetEnd returns the end time for the entry
func (t *TimeEntry) GetEnd() time.Time {
	return t.end
}

// SetEnd sets the end time on the time entry
func (t *TimeEntry) SetEnd(e time.Time) {
	t.end = e
}

// IsActive return true if start is earlier than now and end is zero
func (t *TimeEntry) IsActive() bool {
	return time.Now().After(t.start) && !t.end.IsZero()
}

// GetTags returns all of the tags associated with this time entry
func (t *TimeEntry) GetTags() *TagCollection {
	return t.tags
}

// HasTag returns if the time entry contains a specific tag
func (t *TimeEntry) HasTag(s string) bool {
	for i := 0; i < t.tags.Length(); i++ {
		if t.tags.Get(i) == s {
			return true
		}
	}
	return false
}

// AddTag adds a tag to the time entry (if it isn't already there)
func (t *TimeEntry) AddTag(s string) {
	if !t.HasTag(s) {
		t.tags.Push(s)
	}
}

// RemoveTag removes a tag from the time entry
func (t *TimeEntry) RemoveTag(s string) {
	i := t.tags.Index(s)
	if i != -1 {
		t.tags.Remove(i)
	}
}

// Equals tests if the passed time entry is the same
// as the one that we're calling it on.
func (t *TimeEntry) Equals(tst *TimeEntry) bool {
	return t.uuid == tst.uuid
}

// StartsToday returns if the timer's start time is today
func (t *TimeEntry) StartsToday() bool {
	currTime := time.Now()
	dur := currTime.Hour()*time.Hour + currTime.Minute()*time.Minute
	return time.Since(t.GetStart()) < dur
}

// StartsToday returns if the timer's end time is today
func (t *TimeEntry) EndsToday() bool {
	currTime := time.Now()
	dur := currTime.Hour()*time.Hour + currTime.Minute()*time.Minute
	return time.Since(t.GetEnd()) < dur
}

// String formats a string of the time entry
func (t *TimeEntry) String() string {
	var ret string
	ret = t.GetStart().Format(time.RFC3339)
	if !t.GetEnd().IsZero() {
		ret += " - " + t.GetEnd().Format(time.RFC3339)
	}
	tags := t.GetTags()
	if tags.Length() > 0 {
		ret += " [ "
		for i := 0; i < tags.Length(); i++ {
			ret += tags.Get(i) + " "
		}
		ret += "]"
	}
	if t.GetEnd().IsZero() {
		ret += " Running"
	}
	if t.GetUUID() != "" {
		ret += " (" + t.GetUUID() + ")"
	}
	return ret
}