package main

import (
	"fmt"
	"strconv"
	"strings"
)

type Lane struct {
	Title    string  `json:"LaneTitle"`
	Stories  []Story `json:"Stories"`
	Current  int     `json:"CurrentStory"` // Index of current story
	storyOff int // offset for the lane slice
}

func (l *Lane) CreateStory(b *Board) {
	storyTitle, err := GetAndConfirmCommandLine("Story Title: ")
	if err != nil {
		b.SetMessage(err.Error(), true)
		return
	}
	l.Stories = append(l.Stories, MakeStory(storyTitle))
	if l.Current < 0 {
		l.Current = 0
	}
}

// Zeroes out the offset and current values
func (l *Lane) ResetLoadPositions() {
	if len(l.Stories) > 0 {
		l.Current = 0
	} else {
		l.Current = -1
	}
	l.storyOff = 0
}

func (l Lane) Header(width int, selected bool) string {
	marker := " "
	color := style.Lane
	if selected {
		marker = "*"
		color = style.LaneSelected
	}
	if len(l.Title) > width {
		return fmt.Sprintf("%s\033[1;7m%*.*s%s%s", style.Lane, width, width, l.Title[:width-1], marker, styleOff)
	} else {
		width := width - 2
		leftPad := (width - len(l.Title)) / 2
		rightPad := width - len(l.Title) - leftPad
		return fmt.Sprintf("%s %s\033[1;7m%*.*s%s%s%*.*s\033[27m%s %s", style.Lane, color, leftPad-1, leftPad-1, "", l.Title, marker, rightPad, rightPad, "", style.Lane, styleOff)
	}
}

func (l Lane) StringSlice(width int, selected bool) []string {
	out := make([]string, 0, len(l.Stories) * 3 + 1)
	for i := l.storyOff; i < len(l.Stories); i++ { 
		leadIn := "  "
		if selected && l.Current == i {
			leadIn = "\033[1m➜ "
		}
		out = append(out, fmt.Sprintf("%s%*.*s%s", style.Lane, width, width, " ", styleOff))
		title := l.Stories[i].Title
		pts   := strconv.Itoa(l.Stories[i].Points)
		if pts == "0" || pts[0] == '-' {
			pts = ""
		}
		if len(title) > width-4 {
			title = title[:width-5] + "…"
		}
		out = append(out, fmt.Sprintf("%s %s%s%-*.*s\033[7m%*s\033[27m%s %s", style.Lane, style.Input, leadIn, width-7, width-7, title, 3, pts, style.Lane, styleOff))
	}
	if len(out) > 0 {
		out = append(out, fmt.Sprintf("%s%*.*s%s", style.Lane, width, width, " ", styleOff))
	}
	return out
}

func (l *Lane) Update(args []string, b *Board) {
	location := strings.ToLower(args[0])
	switch location {
	case "title", "t", "name", "n":
		title, err := GetAndConfirmCommandLine("New lane title: ")
		if err != nil {
			b.SetMessage(err.Error(), true)
			break
		}
		l.Title = title
		b.SetMessage("Lane title updated", false)
	default:
		b.SetMessage(fmt.Sprintf("Unknown lane location %q", args[0]), true)
	}
}

func MakeLane(title string) Lane {
	return Lane{title, make([]Story,0,5), -1, 0}
}