package ui

import (
	"fmt"
	"strconv"
	"strings"
	"time"

	"github.com/rivo/tview"

	"git.stinnesbeck.com/nils/arr-tui/internal/arr"
	"git.stinnesbeck.com/nils/arr-tui/internal/radarr"
	"git.stinnesbeck.com/nils/arr-tui/internal/sonarr"
)

// movieLabel is the one-line list entry for a movie.
func movieLabel(m radarr.Movie) string {
	label := tview.Escape(m.Title)
	if m.Year > 0 {
		label += fmt.Sprintf(" (%d)", m.Year)
	}
	if m.InLibrary() {
		label += " [green]✓[-]"
	}
	return label
}

// movieDetails renders the detail pane text for a movie.
func movieDetails(m radarr.Movie) string {
	var b strings.Builder
	title := tview.Escape(m.Title)
	if m.Year > 0 {
		title += fmt.Sprintf(" (%d)", m.Year)
	}
	fmt.Fprintf(&b, "[::b]%s[::-]\n", title)

	var facts []string
	if r := m.Rating(); r > 0 {
		facts = append(facts, fmt.Sprintf("★ %.1f", r))
	}
	if m.Runtime > 0 {
		facts = append(facts, fmt.Sprintf("%dh%02dm", m.Runtime/60, m.Runtime%60))
	}
	if len(m.Genres) > 0 {
		facts = append(facts, tview.Escape(strings.Join(m.Genres, ", ")))
	}
	if len(facts) > 0 {
		b.WriteString(strings.Join(facts, " · ") + "\n")
	}
	if m.Studio != "" {
		fmt.Fprintf(&b, "Studio: %s\n", tview.Escape(m.Studio))
	}
	if m.Status != "" {
		fmt.Fprintf(&b, "Status: %s\n", tview.Escape(m.Status))
	}
	switch {
	case m.HasFile:
		b.WriteString("[green]In library, downloaded[-]\n")
	case m.InLibrary():
		b.WriteString("[yellow]In library, not downloaded[-]\n")
	}
	if m.Overview != "" {
		b.WriteString("\n" + tview.Escape(m.Overview) + "\n")
	}
	return b.String()
}

// profileIndex returns the index of the profile named name, or 0.
func profileIndex(profiles []arr.QualityProfile, name string) int {
	for i, p := range profiles {
		if strings.EqualFold(p.Name, name) {
			return i
		}
	}
	return 0
}

// folderIndex returns the index of the root folder at path, or 0.
func folderIndex(folders []arr.RootFolder, path string) int {
	for i, f := range folders {
		if strings.TrimRight(f.Path, "/") == strings.TrimRight(path, "/") {
			return i
		}
	}
	return 0
}

func itoa(n int) string { return strconv.Itoa(n) }

// seriesLabel is the one-line list entry for a series.
func seriesLabel(s sonarr.Series) string {
	label := tview.Escape(s.Title)
	if s.Year > 0 {
		label += fmt.Sprintf(" (%d)", s.Year)
	}
	if s.InLibrary() {
		label += " [green]✓[-]"
	}
	return label
}

// seriesDetails renders the detail pane text for a series.
func seriesDetails(s sonarr.Series) string {
	var b strings.Builder
	title := tview.Escape(s.Title)
	if s.Year > 0 {
		title += fmt.Sprintf(" (%d)", s.Year)
	}
	fmt.Fprintf(&b, "[::b]%s[::-]\n", title)

	var facts []string
	if s.Ratings.Value > 0 {
		facts = append(facts, fmt.Sprintf("★ %.1f", s.Ratings.Value))
	}
	if n := s.SeasonCount(); n > 0 {
		facts = append(facts, fmt.Sprintf("%d season%s", n, plural(n)))
	}
	if s.Runtime > 0 {
		facts = append(facts, fmt.Sprintf("%d min", s.Runtime))
	}
	if len(s.Genres) > 0 {
		facts = append(facts, tview.Escape(strings.Join(s.Genres, ", ")))
	}
	if len(facts) > 0 {
		b.WriteString(strings.Join(facts, " · ") + "\n")
	}
	if s.Network != "" {
		fmt.Fprintf(&b, "Network: %s\n", tview.Escape(s.Network))
	}
	if s.Status != "" {
		fmt.Fprintf(&b, "Status: %s\n", tview.Escape(s.Status))
	}
	if s.InLibrary() {
		st := s.Statistics
		if st.EpisodeCount > 0 && st.EpisodeFileCount >= st.EpisodeCount {
			b.WriteString("[green]In library, all episodes downloaded[-]\n")
		} else {
			fmt.Fprintf(&b, "[yellow]In library, %d/%d episodes downloaded[-]\n", st.EpisodeFileCount, st.EpisodeCount)
		}
	}
	if s.Overview != "" {
		b.WriteString("\n" + tview.Escape(s.Overview) + "\n")
	}
	return b.String()
}

func plural(n int) string {
	if n == 1 {
		return ""
	}
	return "s"
}

// formatSpeed renders a transfer rate given in KiB/s.
func formatSpeed(kbPerSec float64) string {
	switch {
	case kbPerSec >= 1024:
		return fmt.Sprintf("%.1f MB/s", kbPerSec/1024)
	case kbPerSec >= 1:
		return fmt.Sprintf("%.0f KB/s", kbPerSec)
	}
	return "0 KB/s"
}

// progressBar renders pct (0-100) as a bar of the given width, followed by the percentage.
func progressBar(pct float64, width int) string {
	pct = min(max(pct, 0), 100)
	filled := int(pct / 100 * float64(width))
	return strings.Repeat("█", filled) + strings.Repeat("░", width-filled) + fmt.Sprintf(" %3.0f%%", pct)
}

// formatAge renders a unix timestamp relative to now ("5m ago", "3d ago").
func formatAge(unix int64, now time.Time) string {
	if unix <= 0 {
		return ""
	}
	d := now.Sub(time.Unix(unix, 0))
	switch {
	case d < time.Minute:
		return "just now"
	case d < time.Hour:
		return fmt.Sprintf("%dm ago", int(d.Minutes()))
	case d < 48*time.Hour:
		return fmt.Sprintf("%dh ago", int(d.Hours()))
	}
	return fmt.Sprintf("%dd ago", int(d.Hours()/24))
}

// truncate shortens s to at most n runes, ending in "…" if it was cut.
func truncate(s string, n int) string {
	r := []rune(s)
	if len(r) <= n {
		return s
	}
	return string(r[:n-1]) + "…"
}