package ui

import (
	"fmt"
	"time"

	"github.com/ryanhamamura/via/h"
)

type GameListItem struct {
	ID           string
	Status       int
	OpponentName string
	IsMyTurn     bool
	LastPlayed   time.Time
}

func GameList(games []GameListItem) h.H {
	if len(games) == 0 {
		return nil
	}

	var items []h.H
	for _, g := range games {
		items = append(items, gameListEntry(g))
	}

	listItems := []h.H{h.Class("game-list-items")}
	listItems = append(listItems, items...)

	return h.Div(h.Class("game-list"),
		h.H3(h.Text("Your Games")),
		h.Div(listItems...),
	)
}

func gameListEntry(g GameListItem) h.H {
	statusText, statusClass := getStatusDisplay(g)

	return h.A(
		h.Href("/game/"+g.ID),
		h.Class("game-entry"),
		h.Div(h.Class("game-entry-main"),
			h.Span(h.Class("opponent-name"), h.Text(getOpponentDisplay(g))),
			h.Span(h.Class("game-status "+statusClass), h.Text(statusText)),
		),
		h.Div(h.Class("game-entry-meta"),
			h.Span(h.Class("time-ago"), h.Text(formatTimeAgo(g.LastPlayed))),
		),
	)
}

func getStatusDisplay(g GameListItem) (string, string) {
	switch g.Status {
	case 0: // Waiting
		return "Waiting for opponent", "waiting"
	case 1: // In progress
		if g.IsMyTurn {
			return "Your turn!", "your-turn"
		}
		return "Opponent's turn", "opponent-turn"
	}
	return "", ""
}

func getOpponentDisplay(g GameListItem) string {
	if g.OpponentName == "" {
		return "Waiting for opponent..."
	}
	return "vs " + g.OpponentName
}

func formatTimeAgo(t time.Time) string {
	if t.IsZero() {
		return ""
	}
	duration := time.Since(t)

	if duration < time.Minute {
		return "just now"
	}
	if duration < time.Hour {
		mins := int(duration.Minutes())
		if mins == 1 {
			return "1 minute ago"
		}
		return fmt.Sprintf("%d minutes ago", mins)
	}
	if duration < 24*time.Hour {
		hours := int(duration.Hours())
		if hours == 1 {
			return "1 hour ago"
		}
		return fmt.Sprintf("%d hours ago", hours)
	}
	days := int(duration.Hours() / 24)
	if days == 1 {
		return "yesterday"
	}
	return fmt.Sprintf("%d days ago", days)
}