package tui

import (
	"fmt"
	"strings"

	"github.com/charmbracelet/lipgloss"
)

type hint struct {
	key  string
	desc string
}

func renderHints(hints []hint) string {
	parts := make([]string, len(hints))
	for i, h := range hints {
		parts[i] = hintKeyStyle.Render(h.key) + " " + hintDescStyle.Render(h.desc)
	}
	return strings.Join(parts, "  ")
}

func renderTab(label, key string, active bool) string {
	if active {
		return hintKeyStyle.Render(label) + " " + hintDescStyle.Render(key)
	}
	return hintDescStyle.Render(label) + " " + hintKeyStyle.Render(key)
}

func renderStatusBar(m model, width int) string {
	var leftParts []string

	if m.status != "" {
		leftParts = append(leftParts, statusStyle.Render(m.status))
	} else if preview := m.input.previewText(); m.focus == focusCapture && preview != "" {
		leftParts = append(leftParts, drawerPreviewStyle.Render(preview))
	} else {
		leftParts = append(leftParts, statusStyle.Render(countText(m)))
	}

	leftRendered := strings.Join(leftParts, " "+separatorStyle.Render("│")+" ")
	right := renderHints(contextHints(m))

	gap := width - lipgloss.Width(leftRendered) - lipgloss.Width(right)
	if gap < 0 {
		gap = 0
	}

	pad := lipgloss.NewStyle().Width(gap).Render("")
	return leftRendered + pad + right
}

func countText(m model) string {
	var total int
	if m.mode == modeCards {
		total = len(m.cards.filtered)
	} else {
		total = len(m.list.displayEntities())
	}
	if m.filterTag != "" {
		return fmt.Sprintf("%d entities #%s", total, m.filterTag)
	}
	return fmt.Sprintf("%d entities", total)
}

func contextHints(m model) []hint {
	switch m.state {
	case stateDetail:
		switch m.detail.mode {
		case detailRun:
			return []hint{{"space", "toggle"}, {"j/k", "nav"}, {"r", "reset"}, {"esc", "save+exit"}}
		case detailFill:
			return []hint{{"tab", "next"}, {"⇧tab", "prev"}, {"enter", "copy"}, {"esc", "cancel"}}
		default:
			return []hint{{"p", "promote"}, {"D", "demote"}, {"c", "copy"}, {"e", "edit"}, {"r", "run"}, {"f", "fill"}, {"!", "pin"}, {"esc", "back"}}
		}
	case stateTagFilter:
		return []hint{{"j/k", "nav"}, {"enter", "select"}, {"esc", "cancel"}}
	case stateConfirm:
		return []hint{{"y", "confirm"}, {"n", "cancel"}}
	case statePromote:
		return []hint{{"j/k", "nav"}, {"enter", "select"}, {"esc", "cancel"}}
	case stateAbsorb:
		return []hint{{"j/k", "nav"}, {"enter", "absorb"}, {"esc", "cancel"}}
	}

	switch m.focus {
	case focusCapture:
		return []hint{{"enter", "submit"}, {"esc", "browse"}, {"?…", "search"}, {"-", "todo"}, {"@", "event"}}
	case focusDetail:
		if m.splitDetail {
			return []hint{{"h", "list"}, {"c", "copy"}, {"e", "edit"}, {"p", "promote"}, {"!", "pin"}, {"tab", "capture"}}
		}
		return []hint{{"c", "copy"}, {"e", "edit"}, {"p", "promote"}, {"!", "pin"}, {"esc", "back"}}
	default:
		if m.splitDetail {
			return []hint{{"l", "detail"}, {"d", "del"}, {"#", "filter"}, {"tab", "capture"}, {"?", "help"}}
		}
		if m.mode == modeCards {
			return []hint{{"s", "sort"}, {"i", "intent"}, {"tab", "capture"}, {"?", "help"}}
		}
		return []hint{{"m", "absorb"}, {"d", "del"}, {"#", "filter"}, {"tab", "capture"}, {"?", "help"}}
	}
}