package tui

import (
	"fmt"
	"os"
	"path/filepath"
	"sort"
	"strconv"
	"strings"
	"time"

	"bee/audit/internal/app"
	tea "github.com/charmbracelet/bubbletea"
)

type satProgressMsg struct {
	lines []string
}

// pollSATProgress returns a Cmd that waits 300ms then reads the latest verbose.log
// for the given SAT prefix and returns parsed step progress lines.
func pollSATProgress(prefix string, since time.Time) tea.Cmd {
	return tea.Tick(300*time.Millisecond, func(_ time.Time) tea.Msg {
		return satProgressMsg{lines: readSATProgressLines(prefix, since)}
	})
}

func readSATProgressLines(prefix string, since time.Time) []string {
	pattern := filepath.Join(app.DefaultSATBaseDir, prefix+"-*/verbose.log")
	matches, err := filepath.Glob(pattern)
	if err != nil || len(matches) == 0 {
		return nil
	}
	sort.Strings(matches)
	// Find the latest file created at or after (since - 5s) to account for clock skew.
	cutoff := since.Add(-5 * time.Second)
	candidate := ""
	for _, m := range matches {
		info, statErr := os.Stat(m)
		if statErr == nil && info.ModTime().After(cutoff) {
			candidate = m
		}
	}
	if candidate == "" {
		return nil
	}
	raw, err := os.ReadFile(candidate)
	if err != nil {
		return nil
	}
	return parseSATVerboseProgress(string(raw))
}

// parseSATVerboseProgress parses verbose.log content and returns display lines like:
//
//	"PASS  lscpu (234ms)"
//	"FAIL  stress-ng (60.0s)"
//	"...   sensors-after"
func parseSATVerboseProgress(content string) []string {
	type step struct {
		name       string
		rc         int
		durationMs int
		done       bool
	}

	lines := strings.Split(content, "\n")
	var steps []step
	stepIdx := map[string]int{}

	for i, line := range lines {
		line = strings.TrimSpace(line)
		if idx := strings.Index(line, "] start "); idx >= 0 {
			name := strings.TrimSpace(line[idx+len("] start "):])
			if _, exists := stepIdx[name]; !exists {
				stepIdx[name] = len(steps)
				steps = append(steps, step{name: name})
			}
		} else if idx := strings.Index(line, "] finish "); idx >= 0 {
			name := strings.TrimSpace(line[idx+len("] finish "):])
			si, exists := stepIdx[name]
			if !exists {
				continue
			}
			steps[si].done = true
			for j := i + 1; j < len(lines) && j <= i+3; j++ {
				l := strings.TrimSpace(lines[j])
				if strings.HasPrefix(l, "rc: ") {
					steps[si].rc, _ = strconv.Atoi(strings.TrimPrefix(l, "rc: "))
				} else if strings.HasPrefix(l, "duration_ms: ") {
					steps[si].durationMs, _ = strconv.Atoi(strings.TrimPrefix(l, "duration_ms: "))
				}
			}
		}
	}

	var result []string
	for _, s := range steps {
		display := cleanSATStepName(s.name)
		if s.done {
			status := "PASS"
			if s.rc != 0 {
				status = "FAIL"
			}
			result = append(result, fmt.Sprintf("%-4s  %s (%s)", status, display, fmtDurMs(s.durationMs)))
		} else {
			result = append(result, fmt.Sprintf("...   %s", display))
		}
	}
	return result
}

// cleanSATStepName strips leading digits and dash: "01-lscpu.log" → "lscpu".
func cleanSATStepName(name string) string {
	name = strings.TrimSuffix(name, ".log")
	i := 0
	for i < len(name) && name[i] >= '0' && name[i] <= '9' {
		i++
	}
	if i < len(name) && name[i] == '-' {
		name = name[i+1:]
	}
	return name
}

// pollInstallProgress tails the install log file and returns recent lines as progress.
func pollInstallProgress(logFile string) tea.Cmd {
	return tea.Tick(500*time.Millisecond, func(_ time.Time) tea.Msg {
		return satProgressMsg{lines: readInstallProgressLines(logFile)}
	})
}

func readInstallProgressLines(logFile string) []string {
	raw, err := os.ReadFile(logFile)
	if err != nil {
		return nil
	}
	lines := strings.Split(strings.TrimSpace(string(raw)), "\n")
	// Show last 12 lines
	if len(lines) > 12 {
		lines = lines[len(lines)-12:]
	}
	return lines
}

func fmtDurMs(ms int) string {
	if ms < 1000 {
		return fmt.Sprintf("%dms", ms)
	}
	return fmt.Sprintf("%.1fs", float64(ms)/1000)
}