package internal

import (
	"fmt"
	"strings"

	"charm.land/lipgloss/v2"
	"u-tabs/internal/style"
)

// --- Workspace 三栏渲染 ---

func (m *Model) renderWorkspace() string {
	g := Groups[m.activeGroup]
	svcs := WorkspacesByGroup(g.Label)
	if len(svcs) == 0 {
		return style.SubtitleStyle.Render("  empty")
	}

	avail := m.width - 8
	tabW := max(14, min(20, avail*18/100))
	listW := max(30, avail*45/100)
	detailW := avail - tabW - listW

	tabCw := tabW - 2
	listCw := listW - 2
	detailCw := detailW - 2

	listH := max(3, m.height-7)

	tabLines := m.tabsColumnLines(tabCw, listH-1)
	svcLines := m.wsListLines(g, svcs, listCw, listH-1)
	detailLines := m.wsDetailLines(svcs, detailCw, listH-1)

	maxRows := min(listH-1, max(max(len(tabLines), len(svcLines)), len(detailLines)))

	tabBorderFg := style.BgPanel
	if m.wsFocus == 0 {
		tabBorderFg = style.Accent
	}
	listBorderFg := style.BgPanel
	if m.wsFocus == 1 {
		listBorderFg = style.Accent
	}

	panelSty := lipgloss.NewStyle().Border(lipgloss.RoundedBorder())

	tabBox := panelSty.BorderForeground(tabBorderFg).Width(tabW).Render(
		style.DetailTitle.Render("tabs") + "\n" + padLinesTo(tabLines, tabCw, maxRows))
	listBox := panelSty.BorderForeground(listBorderFg).Width(listW).Render(
		style.DetailTitle.Render(g.Label) + "\n" + padLinesTo(svcLines, listCw, maxRows))
	detailBox := panelSty.BorderForeground(style.BgPanel).Width(detailW).Render(
		style.DetailTitle.Render("detail") + "\n" + padLinesTo(detailLines, detailCw, maxRows))

	return lipgloss.JoinHorizontal(lipgloss.Top, tabBox, " ", listBox, " ", detailBox)
}

func (m *Model) tabsColumnLines(w, listH int) []string {
	var lines []string
	total := len(Groups) + 1
	start, end := viewport(m.wsTabCur, total, listH)

	focused := m.wsFocus == 0

	for i := start; i < end; i++ {
		if i == len(Groups) {
			renderNavEntry(&lines, w, "历史对话", "#7dcfff", m.wsTabCur == i, focused)
			continue
		}

		g := Groups[i]
		label := g.Label
		gs := style.GroupStyles[g.Label]
		isActive := m.wsTabCur == i
		if isActive {
			line := " ▸ " + label
			line = padRightByWidth(truncateByWidth(line, w), w)
			if focused && gs.GetForeground() != (lipgloss.Color("")) {
				sty := lipgloss.NewStyle().Foreground(style.BgDark).Background(gs.GetForeground()).Bold(true)
				lines = append(lines, sty.Render(line))
			} else if gs.GetForeground() != (lipgloss.Color("")) {
				sty := lipgloss.NewStyle().Foreground(gs.GetForeground()).Bold(true)
				lines = append(lines, sty.Render(line))
			} else {
				lines = append(lines, style.SelStyle.Render(line))
			}
		} else {
			line := "   " + label
			line = padRightByWidth(truncateByWidth(line, w), w)
			if gs.GetForeground() != (lipgloss.Color("")) {
				lines = append(lines, gs.Render(line))
			} else {
				lines = append(lines, style.NormStyle.Render(line))
			}
		}
	}
	return lines
}

func (m *Model) wsListLines(g Group, svcs []Workspace, w, listH int) []string {
	start, end := viewport(m.cursor, len(svcs), listH)

	maxTitleW := 0
	for _, ws := range svcs {
		if tw := stringWidth(ws.Title); tw > maxTitleW {
			maxTitleW = tw
		}
	}

	var lines []string
	for i := start; i < end; i++ {
		ws := svcs[i]
		cur := " "
		if i == m.cursor {
			cur = "▸"
		}
		mark := " "
		if m.selected[ws.Index] {
			mark = "✓"
		}

		paddedTitle := padRightByWidth(ws.Title, maxTitleW)

		if i == m.cursor {
			prefix := cur + " " + mark + " " + fmt.Sprintf("%02d", ws.N) + " "
			remainW := max(10, w-stringWidth(prefix))
			text := truncateByWidth(paddedTitle+"  "+ws.Prompt, remainW)
			sty := style.SelStyle
			if m.wsFocus != 1 {
				sty = lipgloss.NewStyle().Foreground(style.Accent).Bold(true)
			}
			lines = append(lines, sty.Render(padRightByWidth(truncateByWidth(prefix+text, w), w)))
		} else {
			markStr := " "
			if m.selected[ws.Index] {
				markStr = style.MarkStyle.Render("✓")
			}
			num := style.NumStyle.Render(fmt.Sprintf("%02d", ws.N))
			prefix := cur + " " + markStr + " " + num + " "
			remainW := max(10, w-stringWidth(prefix))
			text := truncateByWidth(paddedTitle+"  "+ws.Prompt, remainW)
			lines = append(lines, style.NormStyle.Render(padRightByWidth(truncateByWidth(prefix+text, w), w)))
		}
	}
	return lines
}

func (m *Model) wsDetailLines(svcs []Workspace, w, listH int) []string {
	if m.cursor >= len(svcs) {
		return []string{lipgloss.NewStyle().Foreground(style.Dim).Render(fitWidth(" ← select to view", w))}
	}

	ws := svcs[m.cursor]
	sepSty := lipgloss.NewStyle().Foreground(style.BgPanel)
	var lines []string

	lines = append(lines, style.DetailTitle.Render(fitWidth(" "+ws.Title, w)))
	lines = append(lines, sepSty.Render(fitWidth(strings.Repeat("─", w), w)))

	rows := []struct {
		key string
		val string
		sty lipgloss.Style
	}{
		{"dir", ws.Dir, style.ValStyle},
		{"no", fmt.Sprintf("%02d · %s", ws.N, ws.Group), style.NumStyle},
		{"desc", ws.Prompt, style.ValStyle},
		{"tech", ws.Tech, style.TechStyle},
		{"deploy", ws.Deploy, style.DeployStyle},
	}
	for _, r := range rows {
		line := fmt.Sprintf("  %-6s %s", r.key, r.sty.Render(r.val))
		lines = append(lines, style.NormStyle.Render(fitWidth(line, w)))
	}

	lines = append(lines, sepSty.Render(fitWidth(strings.Repeat("─", w), w)))

	hintCmd := "wt"
	if !isWindows {
		hintCmd = "bash"
	}
	lines = append(lines, lipgloss.NewStyle().Foreground(style.Accent).Italic(true).Render(fitWidth("  $ "+hintCmd+" → CC @"+ws.Title, w)))
	lines = append(lines, lipgloss.NewStyle().Foreground(style.Dim).Render(fitWidth("  [Enter]start  [Space]multi", w)))

	if len(lines) > listH {
		lines = lines[:listH]
	}
	return lines
}