//go:build windows

package main

import (
	"fmt"
	"sort"
	"strconv"
	"strings"
	"time"
	"unicode"
	"unicode/utf8"
)

func cleanLogText(s string, limit int) string {
	var out []rune
	for _, r := range s {
		if unicode.IsControl(r) || unicode.In(r, unicode.Cf) || r == '|' {
			r = ' '
		}
		if len(out) >= limit {
			if limit >= 3 {
				out = append(out[:limit-3], '.', '.', '.')
			}
			break
		}
		out = append(out, r)
	}
	return string(out)
}
func priorityRank(p uint32) int {
	switch p {
	case PriorityClassIdle:
		return 0
	case PriorityClassBelowNormal:
		return 1
	case PriorityClassNormal:
		return 2
	case PriorityClassAboveNormal:
		return 3
	case PriorityClassHigh:
		return 4
	case PriorityClassRealtime:
		return 5
	}
	return -1
}
func logMemory(b uint64) string {
	if b >= 1<<30 {
		return fmt.Sprintf("%.1f ГБ", float64(b)/(1<<30))
	}
	if b >= 1<<20 {
		return fmt.Sprintf("%d МБ", b>>20)
	}
	if b >= 1<<10 {
		return fmt.Sprintf("%d КБ", b>>10)
	}
	return fmt.Sprintf("%d Б", b)
}
func writeLogTable(b *strings.Builder, cells [][]string) {
	widths := make([]int, len(cells[0]))
	for _, row := range cells {
		for i, value := range row {
			widths[i] = max(widths[i], utf8.RuneCountInString(value))
		}
	}
	var border strings.Builder
	border.WriteByte('+')
	for _, width := range widths {
		border.WriteString(strings.Repeat("-", width+2))
		border.WriteByte('+')
	}
	border.WriteByte('\n')
	b.WriteString(border.String())
	for n, row := range cells {
		b.WriteByte('|')
		for i, value := range row {
			fmt.Fprintf(b, " %-*s |", widths[i], value)
		}
		b.WriteByte('\n')
		if n == 0 {
			b.WriteString(border.String())
		}
	}
	b.WriteString(border.String())
}
func formatReport(r scanReport, when time.Time) string {
	if r.Title == "" && len(r.Rows) == 0 && len(r.Errors) == 0 {
		return ""
	}
	var b strings.Builder
	header := func(title string) {
		fmt.Fprintf(&b, "[%s] %s", when.Format("02.01.2006 15:04:05"), cleanLogText(title, 200))
		if r.DryRun {
			b.WriteString(" [DRY-RUN: ПЛАН, БЕЗ ИЗМЕНЕНИЙ]")
		}
		b.WriteByte('\n')
	}
	if r.Title != "" || len(r.Rows) > 0 {
		title := r.Title
		if title == "" {
			title = "ИЗМЕНЕНИЕ ПРИОРИТЕТОВ"
		}
		header(title)
		if len(r.Rows) > 0 {
			rows := append([]priorityChange(nil), r.Rows...)
			sort.SliceStable(rows, func(i, j int) bool {
				if rows[i].Heavy != rows[j].Heavy {
					return rows[i].Heavy
				}
				return rows[i].PID < rows[j].PID
			})
			cells := [][]string{{"Процесс", "PID", "Память", "Повышено", "Понижено"}}
			for _, row := range rows {
				columns := []string{cleanLogText(row.Name, 64), strconv.FormatUint(uint64(row.PID), 10), logMemory(row.RSS), "", ""}
				if row.Blocked {
					columns[3] = "в блоклисте"
				} else if row.Unchanged {
					columns[3] = "уже " + prioName(row.After)
				} else {
					change := prioName(row.Before) + " -> " + prioName(row.After)
					if priorityRank(row.After) > priorityRank(row.Before) {
						columns[3] = change
					} else {
						columns[4] = change
					}
				}
				cells = append(cells, columns)
			}
			writeLogTable(&b, cells)
		}
		b.WriteByte('\n')
	}
	if len(r.Errors) > 0 {
		header("ОШИБКИ")
		rows := append([]processError(nil), r.Errors...)
		sort.SliceStable(rows, func(i, j int) bool { return rows[i].PID < rows[j].PID })
		cells := [][]string{{"Процесс", "PID", "Описание ошибки"}}
		for _, problem := range rows {
			name, pid := problem.Name, "-"
			if name == "" {
				name = "autoPriority"
			}
			if problem.PID != 0 {
				pid = strconv.FormatUint(uint64(problem.PID), 10)
			}
			cells = append(cells, []string{cleanLogText(name, 64), pid, cleanLogText(problem.Description, 1500)})
		}
		writeLogTable(&b, cells)
		b.WriteByte('\n')
	}
	return b.String()
}