package tui

import (
	"fmt"
	"strings"

	tea "github.com/charmbracelet/bubbletea"
	"github.com/charmbracelet/lipgloss"
	"github.com/muyue/muyue/internal/workflow"
)

func (m Model) handleWorkflowKey(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
	if m.orch == nil || m.orch.Workflow == nil {
		return m, nil
	}

	wf := m.orch.Workflow

	switch msg.String() {
	case "a":
		if wf.Phase == workflow.PhaseReviewing {
			m.chatLog = append(m.chatLog, userMsgStyle.Render("you: [Plan approved]"))
			m.chatLoading = true
			m.viewport.SetContent(m.renderContent())
			return m, reviewPlanCmd(m.orch, true, "")
		}
	case "r":
		if wf.Phase == workflow.PhaseReviewing {
			m.chatInput = ""
			m.chatLog = append(m.chatLog, itemWarnStyle.Render("Type your rejection feedback below:"))
			m.viewport.SetContent(m.renderContent())
		}
	case "g":
		if wf.Phase == workflow.PhaseGathering && len(wf.Plan.Questions) > 0 && len(wf.Plan.Answers) >= len(wf.Plan.Questions) {
			m.chatLog = append(m.chatLog, userMsgStyle.Render("you: [Generate plan]"))
			m.chatLoading = true
			m.viewport.SetContent(m.renderContent())
			return m, generatePlanCmd(m.orch)
		}
	case "n":
		if wf.Phase == workflow.PhaseExecuting {
			current := wf.CurrentStep()
			if current != nil {
				m.chatLoading = true
				m.viewport.SetContent(m.renderContent())
				return m, continueWorkflowCmd(m.orch, "proceeding")
			}
		}
	case "x":
		wf.Reset()
		m.chatLog = append(m.chatLog, itemWarnStyle.Render("Workflow reset."))
		m.viewport.SetContent(m.renderContent())
	}
	return m, nil
}

func (m Model) renderWorkflow() string {
	var b strings.Builder

	if m.orch == nil || m.orch.Workflow == nil {
		b.WriteString("Workflow engine not available.")
		return b.String()
	}

	wf := m.orch.Workflow

	b.WriteString(sectionStyle.Render("Workflow"))
	b.WriteString("  ")

	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(accentColor).Bold(true),
		workflow.PhaseReviewing: lipgloss.NewStyle().Foreground(aiColor).Bold(true),
		workflow.PhaseExecuting: lipgloss.NewStyle().Foreground(baseColor).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(fmt.Sprintf("Goal: %s\n\n", wf.Plan.Goal))
	}

	switch wf.Phase {
	case workflow.PhaseIdle:
		b.WriteString("No active workflow.\n")
		b.WriteString("Type /plan <goal> to start a structured workflow.\n")
		b.WriteString("Example: /plan Create a REST API in Go\n")

	case workflow.PhaseGathering:
		b.WriteString(sectionStyle.Render("Gathering Requirements"))
		b.WriteString("\n")
		for i, q := range wf.Plan.Questions {
			icon := itemPendingStyle.Render("  ")
			if i < len(wf.Plan.Answers) {
				icon = itemOKStyle.Render("  ")
				b.WriteString(fmt.Sprintf("  %s Q: %s\n", icon, q))
				b.WriteString(fmt.Sprintf("      A: %s\n", wf.Plan.Answers[i]))
			} else {
				b.WriteString(fmt.Sprintf("  %s Q: %s\n", icon, q))
			}
		}
		if len(wf.Plan.Answers) >= len(wf.Plan.Questions) && len(wf.Plan.Questions) > 0 {
			b.WriteString("\n  ")
			b.WriteString(itemOKStyle.Render("[g] Generate plan"))
			b.WriteString("\n")
		}

	case workflow.PhasePlanning:
		b.WriteString(m.spinner.View())
		b.WriteString(" ")
		b.WriteString(itemWarnStyle.Render("Generating plan..."))
		b.WriteString("\n")

	case workflow.PhaseReviewing:
		b.WriteString(sectionStyle.Render("Plan (review before execution)"))
		b.WriteString("\n\n")
		for i, s := range wf.Plan.Steps {
			numStyle := lipgloss.NewStyle().Foreground(accentColor).Bold(true)
			icon := stepPendingStyle.Render("  ")
			b.WriteString(fmt.Sprintf("  %s %s %s\n", icon, numStyle.Render("#"+s.ID+":"), s.Title))
			b.WriteString(fmt.Sprintf("       %s\n", lipgloss.NewStyle().Foreground(lipgloss.Color("#E0E0E0")).Render(s.Description)))
			agentStyle := lipgloss.NewStyle().Foreground(aiColor).Render(s.Agent)
			b.WriteString(fmt.Sprintf("       Agent: %s\n", agentStyle))
			if i < len(wf.Plan.Steps)-1 {
				b.WriteString("\n")
			}
		}
		b.WriteString("\n  ")
		b.WriteString(itemOKStyle.Render("[a] Approve plan"))
		b.WriteString("  ")
		b.WriteString(itemMissingStyle.Render("[r] Reject with feedback"))
		b.WriteString("\n")

		if len(wf.Plan.PreviewFiles) > 0 {
			b.WriteString("\n  ")
			b.WriteString(itemWarnStyle.Render("Preview files available (opened in browser)"))
			b.WriteString("\n")
		}

	case workflow.PhaseExecuting:
		b.WriteString(sectionStyle.Render("Executing Plan"))
		b.WriteString("\n\n")
		done, total := wf.Progress()

		m.progressBar.SetPercent(float64(done) / float64(max(total, 1)))
		fmt.Fprintf(&b, "  %s %d/%d\n\n", m.progressBar.View(), done, total)

		for _, s := range wf.Plan.Steps {
			var icon string
			switch s.Status {
			case "done":
				icon = stepDoneStyle.Render("  ")
			case "error":
				icon = stepErrorStyle.Render("  ")
			default:
				if wf.Plan.Steps[wf.Plan.StepIndex].ID == s.ID {
					icon = stepCurrentStyle.Render(">")
				} else {
					icon = stepPendingStyle.Render("  ")
				}
			}
			b.WriteString(fmt.Sprintf("  %s %s: %s\n", icon, s.ID, s.Title))
			if s.Output != "" {
				output := s.Output
				if len(output) > 80 {
					output = output[:80] + "..."
				}
				b.WriteString(fmt.Sprintf("     %s\n", output))
			}
		}
		b.WriteString("\n  ")
		b.WriteString(itemOKStyle.Render("[n] Next step"))
		b.WriteString("  ")
		b.WriteString(itemMissingStyle.Render("[x] Cancel workflow"))
		b.WriteString("\n")

	case workflow.PhaseDone:
		b.WriteString(itemOKStyle.Render("Workflow completed!"))
		b.WriteString("\n\n")
		for _, s := range wf.Plan.Steps {
			icon := stepDoneStyle.Render("  ")
			b.WriteString(fmt.Sprintf("  %s %s: %s\n", icon, s.ID, s.Title))
		}
		b.WriteString("\n  [x] Reset workflow\n")

	case workflow.PhaseError:
		b.WriteString(itemMissingStyle.Render("Workflow encountered an error."))
		b.WriteString("\n  [x] Reset workflow\n")
	}

	b.WriteString("\n\n")
	b.WriteString(lipgloss.NewStyle().Foreground(dimColor).Render(strings.Repeat("─", max(m.width-4, 10))))
	b.WriteString("\n")
	b.WriteString(sectionStyle.Render("Chat"))
	b.WriteString("\n")
	for _, msg := range m.chatLog {
		lines := strings.Split(msg, "\n")
		for _, line := range lines {
			if len(line) > m.width-4 {
				line = line[:m.width-7] + "..."
			}
			b.WriteString("  " + line + "\n")
		}
	}

	return b.String()
}