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package ui

import (
	"fmt"
	"sort"
	"strings"
	"time"

	"github.com/charmbracelet/lipgloss"

	"github.com/humdrum-tiv/sportsball/internal/model"
)

// tickerCellW is the inner width of one ticker box (before border).
const tickerCellW = 12

// tickerGames is the ordered list of games shown in the detail-view ticker:
// live games first (the watched game's league before other leagues), then
// today's finals (same ordering). The currently-watched game is excluded so
// the strip is always "around the league" context. Built from already-polled
// data — no extra fetch.
func (a App) tickerGames() []model.Game {
	now := time.Now()
	watchLeague := a.detail.League

	// Collect today's live + final games (excluding the watched one), preserving
	// league display order so it survives the stable sort as the final tiebreak.
	var games []model.Game
	for _, l := range a.leagues {
		for _, g := range filterDay(a.games[l.ID], now) {
			if g.ID == a.detail.ID {
				continue
			}
			if g.State == model.StateLive || g.State == model.StateFinal {
				games = append(games, g)
			}
		}
	}

	// Rank (low = first):
	//   the game we just navigated away from (back-breadcrumb), then favorites,
	//   then by league (watched before others), then live before final:
	//   fav → same-live → same-final → other-live → other-final.
	// Stable so same-rank games keep their league/scoreboard order.
	rank := func(g model.Game) int {
		if g.ID == a.detailPrev {
			return -1
		}
		r := 0
		if !a.hasFav(g) {
			r += 100
		}
		if g.League != watchLeague {
			r += 10
		}
		if g.State != model.StateLive {
			r++
		}
		return r
	}
	sort.SliceStable(games, func(i, j int) bool {
		return rank(games[i]) < rank(games[j])
	})
	return games
}

// tickerStrip renders the selectable game boxes above the watched game's score
// box, windowed horizontally so the selected box stays on screen. Returns ""
// when there are no other games to show.
func (a App) tickerStrip() string {
	games := a.tickerGames()
	if len(games) == 0 {
		return ""
	}
	sel := a.tickerCursor
	if sel >= len(games) {
		sel = len(games) - 1
	}
	if sel < 0 {
		sel = 0
	}

	cells := make([]string, len(games))
	for i, g := range games {
		cells[i] = a.tickerCell(g, i == sel)
	}

	// Each rendered cell is tickerCellW + 2 (border) wide; +1 for the gap.
	cellW := tickerCellW + 2 + 1
	fit := max(1, a.width/cellW)
	lo, hi := tickerWindow(len(cells), sel, fit)

	row := lipgloss.JoinHorizontal(lipgloss.Top, cells[lo:hi]...)
	left := "  "
	if lo > 0 {
		left = lipgloss.NewStyle().Foreground(colAccent).Bold(true).Render("‹ ")
	}
	right := "  "
	if hi < len(cells) {
		right = lipgloss.NewStyle().Foreground(colAccent).Bold(true).Render(" ›")
	}
	strip := lipgloss.JoinHorizontal(lipgloss.Center, left, row, right)
	return lipgloss.PlaceHorizontal(a.width, lipgloss.Center, strip,
		lipgloss.WithWhitespaceChars(" "))
}

// tickerWindow returns the [lo,hi) slice of n cells that keeps index sel
// visible within a fit-wide window.
func tickerWindow(n, sel, fit int) (int, int) {
	if n <= fit {
		return 0, n
	}
	lo := sel - fit/2
	if lo < 0 {
		lo = 0
	}
	if lo+fit > n {
		lo = n - fit
	}
	return lo, lo + fit
}

// tickerCell renders one compact game box: a state badge over away/home rows
// with scores. Selected gets the accent border; the back-breadcrumb (the game
// just navigated away from) is marked with a ↩ and a purple border; others a
// faint border.
func (a App) tickerCell(g model.Game, selected bool) string {
	isPrev := g.ID == a.detailPrev
	l, _ := model.LeagueByID(g.League)
	tag := lipgloss.NewStyle().Foreground(teamColor(l.Color)).Bold(true).Render(l.Icon)
	if isPrev {
		tag = lipgloss.NewStyle().Foreground(colAccent2).Bold(true).Render("↩") + tag
	}

	// League glyph on the left, state/clock filling the rest. Truncate the raw
	// text (not the styled string) so ANSI codes stay intact.
	avail := max(tickerCellW-lipgloss.Width(tag)-1, 0)
	var state string
	switch g.State {
	case model.StateLive:
		clock := g.Clock
		if clock == "" || clock == "0:00" {
			clock = "LIVE"
		}
		state = liveDot(a.pulse()) + " " +
			lipgloss.NewStyle().Foreground(colLive).Bold(true).
				Render(truncate(clock, avail-2))
	case model.StateFinal:
		state = styleFinal.Render(truncate("◼ FIN", avail))
	default:
		state = styleSubtle.Render(truncate(startLabel(g), avail))
	}
	badge := lipgloss.NewStyle().Width(tickerCellW).Render(tag + " " + state)

	row := func(t model.Team) string {
		star := " "
		if a.isFav(g.League, t) {
			star = lipgloss.NewStyle().Foreground(colWarn).Render("★")
		}
		abbr := star + lipgloss.NewStyle().Foreground(teamColor(t.Color)).Bold(true).
			Render(fmt.Sprintf("%-3s", t.Abbr))
		score := "-"
		if g.Started() {
			score = fmt.Sprintf("%d", t.Score)
		}
		ss := styleScore
		if g.Started() && t.Winner {
			ss = styleWin
		}
		gap := tickerCellW - lipgloss.Width(abbr) - lipgloss.Width(score)
		if gap < 1 {
			gap = 1
		}
		return abbr + strings.Repeat(" ", gap) + ss.Render(score)
	}

	body := lipgloss.JoinVertical(lipgloss.Left, badge, row(g.Away), row(g.Home))

	border := lipgloss.NormalBorder()
	style := lipgloss.NewStyle().Border(border).BorderForeground(colBorder).
		Padding(0, 0).Width(tickerCellW)
	switch {
	case selected:
		style = style.BorderForeground(colAccent)
	case isPrev:
		style = style.BorderForeground(colAccent2)
	}
	return style.Render(body)
}