package tui

import (
	"fmt"
	"strings"

	"github.com/charmbracelet/lipgloss"
	"github.com/muyue/muyue/internal/proxy"
	"github.com/muyue/muyue/internal/workflow"
)

func (m Model) renderStudio() string {
	if m.studioSidebarOpen {
		sidebarWidth := 28
		chatWidth := m.width - sidebarWidth - 2
		if chatWidth < 20 {
			chatWidth = 20
			sidebarWidth = m.width - chatWidth - 2
		}

		sidebar := m.renderStudioSidebar(sidebarWidth)
		chat := m.renderStudioChat(chatWidth)

		return lipgloss.JoinHorizontal(lipgloss.Top, sidebar, chat)
	}

	return m.renderStudioChat(m.width)
}

func (m Model) renderStudioSidebar(width int) string {
	var b strings.Builder

	b.WriteString(renderSectionWithIcon("Studio", "◈"))
	b.WriteString("\n\n")

	panels := []struct {
		name  string
		panel studioPanel
		icon  string
	}{
		{"Chat", panelChat, "💬"},
		{"Agents", panelAgents, "◉"},
		{"Workflows", panelWorkflows, "⟐"},
	}

	for _, p := range panels {
		if m.studioPanel == p.panel {
			activeStyle := lipgloss.NewStyle().
				Foreground(lipgloss.Color("#FFFFFF")).
				Background(primaryColor).
				Bold(true).
				Padding(0, 1)
			b.WriteString(activeStyle.Render(p.icon + " " + p.name))
			b.WriteString("\n")
		} else {
			inactiveStyle := lipgloss.NewStyle().
				Foreground(textDimColor).
				Padding(0, 1)
			b.WriteString(inactiveStyle.Render(p.icon + " " + p.name))
			b.WriteString("\n")
		}
	}

	b.WriteString("\n")
	b.WriteString(lipgloss.NewStyle().Foreground(borderColor).Render(strings.Repeat("─", width-4)))
	b.WriteString("\n\n")

	switch m.studioPanel {
	case panelAgents:
		m.renderAgentsSidebar(&b, width)
	case panelWorkflows:
		m.renderWorkflowSidebar(&b, width)
	default:
		m.renderChatSidebar(&b, width)
	}

	return sidebarStyle.Width(width).Render(b.String())
}

func (m Model) renderChatSidebar(b *strings.Builder, width int) {
	b.WriteString(lipgloss.NewStyle().Foreground(mutedColor).Render("Active Provider"))
	b.WriteString("\n")
	provider := "none"
	if m.config != nil {
		provider = m.config.Profile.Preferences.DefaultAI
	}
	b.WriteString(lipgloss.NewStyle().Foreground(roseColor).Bold(true).Render("  " + provider))
	b.WriteString("\n\n")

	b.WriteString(lipgloss.NewStyle().Foreground(mutedColor).Render("Commands"))
	b.WriteString("\n")
	cmds := []string{"/plan <goal>", "/help"}
	for _, c := range cmds {
		b.WriteString(lipgloss.NewStyle().Foreground(dimColor).Render("  " + c))
		b.WriteString("\n")
	}

	if m.previewURL != "" {
		b.WriteString("\n")
		b.WriteString(lipgloss.NewStyle().Foreground(mutedColor).Render("Preview"))
		b.WriteString("\n")
		b.WriteString(itemOKStyle.Render("  " + m.previewURL))
		b.WriteString("\n")
	}
}

func (m Model) renderAgentsSidebar(b *strings.Builder, width int) {
	agents := []struct {
		name      string
		agentType proxy.AgentType
		tool      string
	}{
		{"Crush", proxy.AgentCrush, "GLM"},
		{"Claude Code", proxy.AgentClaude, "Anthropic"},
	}

	for _, a := range agents {
		status, _ := m.proxyMgr.Status(a.agentType)
		available := m.proxyMgr.IsAvailable(a.agentType)

		var statusIcon string
		switch status {
		case proxy.StatusRunning:
			statusIcon = lipgloss.NewStyle().Foreground(warmColor).Render("● running")
		case proxy.StatusStopped:
			statusIcon = lipgloss.NewStyle().Foreground(mutedColor).Render("○ stopped")
		case proxy.StatusError:
			statusIcon = lipgloss.NewStyle().Foreground(errorColor).Render("✗ error")
		default:
			if available {
				statusIcon = lipgloss.NewStyle().Foreground(successColor).Render("✓ available")
			} else {
				statusIcon = lipgloss.NewStyle().Foreground(dimColor).Render("✗ not installed")
			}
		}

		b.WriteString(lipgloss.NewStyle().Foreground(textColor).Bold(true).Render(a.name))
		b.WriteString("\n")
		b.WriteString(fmt.Sprintf("  %s\n", statusIcon))
		b.WriteString(lipgloss.NewStyle().Foreground(dimColor).Render(fmt.Sprintf("  %s\n", a.tool)))
		b.WriteString("\n")
	}

	b.WriteString(lipgloss.NewStyle().Foreground(mutedColor).Render("Actions"))
	b.WriteString("\n")
	b.WriteString(lipgloss.NewStyle().Foreground(primaryColor).Bold(true).Render("  [c]"))
	b.WriteString(lipgloss.NewStyle().Foreground(textColor).Render(" Start Crush"))
	b.WriteString("\n")
	b.WriteString(lipgloss.NewStyle().Foreground(primaryColor).Bold(true).Render("  [l]"))
	b.WriteString(lipgloss.NewStyle().Foreground(textColor).Render(" Start Claude"))
	b.WriteString("\n")
}

func (m Model) renderWorkflowSidebar(b *strings.Builder, width int) {
	if m.orch == nil || m.orch.Workflow == nil {
		b.WriteString(lipgloss.NewStyle().Foreground(mutedColor).Render("No active workflow."))
		b.WriteString("\n\n")
		b.WriteString(lipgloss.NewStyle().Foreground(dimColor).Render("Use /plan <goal> in chat"))
		b.WriteString("\n")
		b.WriteString(lipgloss.NewStyle().Foreground(dimColor).Render("to start a workflow."))
		b.WriteString("\n")
		return
	}

	wf := m.orch.Workflow

	phaseColors := map[workflow.Phase]lipgloss.Style{
		workflow.PhaseIdle:      lipgloss.NewStyle().Foreground(mutedColor),
		workflow.PhaseGathering: lipgloss.NewStyle().Foreground(warningColor).Bold(true),
		workflow.PhasePlanning:  lipgloss.NewStyle().Foreground(roseColor).Bold(true),
		workflow.PhaseReviewing: lipgloss.NewStyle().Foreground(accentColor).Bold(true),
		workflow.PhaseExecuting: lipgloss.NewStyle().Foreground(primaryColor).Bold(true),
		workflow.PhaseDone:      lipgloss.NewStyle().Foreground(successColor).Bold(true),
		workflow.PhaseError:     lipgloss.NewStyle().Foreground(errorColor).Bold(true),
	}

	if style, ok := phaseColors[wf.Phase]; ok {
		b.WriteString(style.Render(string(wf.Phase)))
	}
	b.WriteString("\n\n")

	if wf.Plan.Goal != "" {
		b.WriteString(lipgloss.NewStyle().Foreground(mutedColor).Render("Goal"))
		b.WriteString("\n")
		b.WriteString(lipgloss.NewStyle().Foreground(textColor).Render(wf.Plan.Goal))
		b.WriteString("\n\n")
	}

	if wf.Phase == workflow.PhaseExecuting {
		done, total := wf.Progress()
		m.progressBar.SetPercent(float64(done) / float64(max(total, 1)))
		b.WriteString(m.progressBar.View())
		b.WriteString(fmt.Sprintf(" %d/%d", done, total))
		b.WriteString("\n\n")
	}

	b.WriteString(lipgloss.NewStyle().Foreground(mutedColor).Render("Controls"))
	b.WriteString("\n")
	controls := []struct {
		key  string
		desc string
	}{
		{"[a]", "Approve plan"},
		{"[r]", "Reject plan"},
		{"[g]", "Generate plan"},
		{"[n]", "Next step"},
		{"[x]", "Cancel"},
	}
	for _, c := range controls {
		b.WriteString(lipgloss.NewStyle().Foreground(primaryColor).Bold(true).Render("  " + c.key))
		b.WriteString(lipgloss.NewStyle().Foreground(textDimColor).Render(" " + c.desc))
		b.WriteString("\n")
	}
}

func (m Model) renderStudioChat(width int) string {
	var b strings.Builder

	chatHeader := renderSectionWithIcon("Chat", "💬")
	if m.chatLoading {
		chatHeader += "  " + m.spinner.View() + lipgloss.NewStyle().Foreground(warningColor).Render("thinking...")
	}
	b.WriteString(chatHeader)
	b.WriteString("\n\n")

	sep := lipgloss.NewStyle().Foreground(borderColor).Render(strings.Repeat("─", max(width-4, 10)))
	b.WriteString(" " + sep)
	b.WriteString("\n\n")

	for _, msg := range m.chatLog {
		b.WriteString(msg)
		b.WriteString("\n\n")
	}

	return b.String()
}

func (m Model) handleStudioPanelSwitch(panel studioPanel) {
	m.studioPanel = panel
	m.viewport.SetContent(m.renderContent())
}