package tui

import (
	"fmt"
	"strings"

	"github.com/charmbracelet/lipgloss"
	"github.com/kunchenguid/no-mistakes/internal/cimonitor"
	"github.com/kunchenguid/no-mistakes/internal/ipc"
	"github.com/kunchenguid/no-mistakes/internal/types"
)

// isCIActive returns true if the CI step is currently running.
func isCIActive(steps []ipc.StepResultInfo) bool {
	for _, s := range steps {
		if s.StepName == types.StepCI {
			switch s.Status {
			case types.StepStatusRunning:
				return true
			}
		}
	}
	return false
}

// ciStepStatus returns the current status of the CI step.
func ciStepStatus(steps []ipc.StepResultInfo) types.StepStatus {
	for _, s := range steps {
		if s.StepName == types.StepCI {
			return s.Status
		}
	}
	return types.StepStatusPending
}

// extractPRFromLogs extracts the PR number from CI log messages.
// Looks for the "monitoring CI for PR #42" pattern. Returns empty if not found.
func extractPRFromLogs(logs []string) string {
	for _, line := range logs {
		if idx := strings.Index(line, "PR #"); idx >= 0 {
			rest := line[idx+4:]
			end := strings.IndexAny(rest, " ()\n")
			if end < 0 {
				end = len(rest)
			}
			num := rest[:end]
			if num != "" {
				return num
			}
		}
	}
	return ""
}

// ciActivity summarizes what the CI step has been doing based on logs. It is an
// alias of cimonitor.Activity so the TUI and the agent-facing axi commands read
// CI state through the exact same parser.
type ciActivity = cimonitor.Activity

// parseCIActivity extracts structured activity from CI log messages. It defers
// to cimonitor so the TUI never drifts from how axi interprets the same logs.
func parseCIActivity(logs []string) ciActivity {
	return cimonitor.ParseActivity(logs)
}

// renderCIView renders the CI-specific monitoring view.
// Shown instead of generic findings when the CI step is active.
func renderCIView(run *ipc.RunInfo, steps []ipc.StepResultInfo, findings string, logs []string, width int) string {
	return renderCIViewWithSelection(run, steps, findings, logs, width, -1, 0, nil)
}

func renderCIViewWithSelection(run *ipc.RunInfo, steps []ipc.StepResultInfo, findings string, logs []string, width int, height int, cursor int, selected map[string]bool) string {
	var b strings.Builder

	boxWidth := width
	if boxWidth < 20 {
		boxWidth = 80
	}
	contentWidth := boxWidth - 4 // account for box border + padding

	dimStyle := lipgloss.NewStyle().Foreground(lipgloss.Color(ansiBrightBlack))
	if run != nil && run.PRURL != nil && *run.PRURL != "" {
		prText, _ := cutText(shortPRLabel(*run.PRURL), contentWidth)
		b.WriteString(dimStyle.Render(prText) + "\n")
	} else if num := extractPRFromLogs(logs); num != "" {
		prText, _ := cutText("PR #"+num, contentWidth)
		b.WriteString(dimStyle.Render(prText) + "\n")
	}

	// State indicator.
	status := ciStepStatus(steps)
	activity := parseCIActivity(logs)

	b.WriteString("\n")

	switch status {
	case types.StepStatusRunning:
		if activity.AutoFixing {
			style := lipgloss.NewStyle().Foreground(lipgloss.Color(ansiBlue))
			b.WriteString(style.Render("\u2699 Auto-fixing CI failures...") + "\n")
		} else if activity.Ready {
			style := lipgloss.NewStyle().Bold(true).Foreground(lipgloss.Color(ansiGreen))
			b.WriteString(style.Render("✓ Checks passed") + "\n")
			dim := lipgloss.NewStyle().Foreground(lipgloss.Color(ansiBrightBlack))
			b.WriteString(dim.Render("still monitoring until merged or closed") + "\n")
		} else {
			style := lipgloss.NewStyle().Foreground(lipgloss.Color(ansiGreen))
			b.WriteString(style.Render("◉ Monitoring CI checks...") + "\n")
		}
	}

	// CI auto-fix count.
	if activity.CIFixes > 0 {
		b.WriteString(dimStyle.Render(fmt.Sprintf("CI auto-fixes: %d", activity.CIFixes)) + "\n")
	}

	// Last activity, truncated to fit inside the box.
	if activity.LastEvent != "" {
		eventText := "Latest: " + activity.LastEvent
		eventText, _ = cutText(eventText, contentWidth)
		b.WriteString(dimStyle.Render(eventText) + "\n")
	}

	// Log tail during monitoring.
	// Dynamically fill available height: subtract box borders and fixed content lines.
	if len(logs) > 0 && height >= 0 {
		// Count fixed lines already written above.
		fixedLines := 2 // box top + bottom borders
		fixedLines += lipgloss.Height(b.String())
		fixedLines++ // blank line before log tail

		logLines := height - fixedLines
		if logLines < 1 {
			logLines = 0
		}

		if logLines > 0 {
			b.WriteString("\n")
			for _, line := range renderLogTail(logs, contentWidth, logLines) {
				b.WriteString(line + "\n")
			}
		}
	} else if len(logs) > 0 {
		// No height info - show a reasonable default.
		b.WriteString("\n")
		for _, line := range renderLogTail(logs, contentWidth, 10) {
			b.WriteString(line + "\n")
		}
	}

	return renderBox("CI", b.String(), boxWidth)
}