package main

import (
	"bytes"
	"flag"
	"fmt"
	"html"
	"io/fs"
	"os"
	"path/filepath"
	"regexp"
	"sort"
	"strconv"
	"strings"

	"gopkg.in/yaml.v3"
)

type ParamSpec struct {
	ID        int         `yaml:"id"`
	Code      string      `yaml:"code"`
	DataType  string      `yaml:"data_type"`
	Type      string      `yaml:"type"`
	Required  bool        `yaml:"required"`
	Default   interface{} `yaml:"default"`
	Descr     string      `yaml:"descr"`
	Man       string      `yaml:"man"`
	RefSvcID  *int        `yaml:"ref_svc_id"`
	Func      string      `yaml:"func"`
	MinValue  *int        `yaml:"minvalue"`
	MaxValue  *int        `yaml:"maxvalue"`
	Regex     string      `yaml:"regex"`
	ValueList []string    `yaml:"value_list"`
	Unique    string      `yaml:"unique_scope"`
	MaxLength *int        `yaml:"maxlength"`
	MinLength *int        `yaml:"minlength"`
}

type OperationSpec struct {
	Name        string      `yaml:"name"`
	ID          int         `yaml:"id"`
	Kind        string      `yaml:"kind"`
	Action      string      `yaml:"action"`
	Subresource string      `yaml:"subresource"`
	Man         string      `yaml:"man"`
	Params      []ParamSpec `yaml:"params"`
}

type OutputParam struct {
	Code      string `yaml:"code"`
	Type      string `yaml:"type"`
	Sensitive bool   `yaml:"sensitive"`
}

type ServiceSpec struct {
	Name               string `yaml:"name"`
	ServiceID          int    `yaml:"service_id"`
	ServiceDisplayName string `yaml:"service_display_name"`
	ServiceMan         string `yaml:"service_man"`
	Lifecycle          struct {
		DeleteModeDefault     string `yaml:"delete_mode_default"`
		ResumeIfExistsDefault bool   `yaml:"resume_if_exists_default"`
	} `yaml:"lifecycle"`
	Outputs struct {
		Params []OutputParam `yaml:"params"`
	} `yaml:"outputs"`
	Operations []OperationSpec `yaml:"operations"`
}

type ServiceMeta struct {
	ID   int
	Name string
}

func main() {
	resourcesDirFlag := flag.String("resources", "", "Path to resources_yaml")
	docsDirFlag := flag.String("docs", "", "Path to docs/30_registry/resources")
	servicesListFlag := flag.String("services", "", "Path to devops/config/services_list.txt")
	excludeFlag := flag.String("exclude", "clickhouse", "Comma-separated resource names to skip")
	versionFlag := flag.String("version", "", "Provider version for example block")
	flag.Parse()

	root := detectRoot()
	resourcesDir := pickPath(*resourcesDirFlag, filepath.Join(root, "universal_rebuild", "resources_yaml"))
	docsDir := pickPath(*docsDirFlag, filepath.Join(root, "docs", "30_registry", "resources"))
	servicesList := pickPath(*servicesListFlag, filepath.Join(root, "devops", "config", "services_list.txt"))
	excludeSet := toSet(*excludeFlag)
	version := *versionFlag
	if version == "" {
		version = detectVersion(filepath.Join(root, "universal_rebuild", "main.go"))
	}

	servicesOrder := loadServicesList(servicesList)
	specs := loadSpecs(resourcesDir, servicesOrder)
	if len(specs) == 0 {
		fmt.Fprintf(os.Stderr, "No specs found in %s\n", resourcesDir)
		os.Exit(1)
	}

	if err := os.MkdirAll(docsDir, 0o755); err != nil {
		panic(err)
	}

	for _, spec := range specs {
		if excludeSet[spec.Name] {
			continue
		}
		writeResourceDocs(docsDir, spec, version)
	}
}

func detectRoot() string {
	cwd, err := os.Getwd()
	if err != nil {
		panic(err)
	}
	if filepath.Base(cwd) == "universal_rebuild" {
		return filepath.Dir(cwd)
	}
	return cwd
}

func pickPath(value, fallback string) string {
	if value != "" {
		return value
	}
	return fallback
}

func toSet(csv string) map[string]bool {
	out := map[string]bool{}
	for _, item := range strings.Split(csv, ",") {
		trimmed := strings.TrimSpace(item)
		if trimmed == "" {
			continue
		}
		out[trimmed] = true
	}
	return out
}

func detectVersion(mainPath string) string {
	b, err := os.ReadFile(mainPath)
	if err != nil {
		return "2.x"
	}
	re := regexp.MustCompile(`version string\s*=\s*"([0-9.]+)"`)
	match := re.FindStringSubmatch(string(b))
	if len(match) > 1 {
		return match[1]
	}
	return "2.x"
}

func loadServicesList(path string) []ServiceMeta {
	b, err := os.ReadFile(path)
	if err != nil {
		return nil
	}
	lines := strings.Split(string(b), "\n")
	out := []ServiceMeta{}
	for _, line := range lines {
		line = strings.TrimSpace(line)
		if line == "" || strings.HasPrefix(line, "#") {
			continue
		}
		head := strings.SplitN(line, "#", 2)[0]
		parts := strings.Fields(head)
		if len(parts) < 2 {
			continue
		}
		id, err := strconv.Atoi(parts[0])
		if err != nil {
			continue
		}
		out = append(out, ServiceMeta{ID: id, Name: parts[1]})
	}
	return out
}

func loadSpecs(dir string, ordered []ServiceMeta) []ServiceSpec {
	specsByID := map[int]ServiceSpec{}
	walkErr := filepath.WalkDir(dir, func(path string, d fs.DirEntry, err error) error {
		if err != nil {
			return err
		}
		if d.IsDir() || !strings.HasSuffix(d.Name(), ".yaml") {
			return nil
		}
		b, err := os.ReadFile(path)
		if err != nil {
			return err
		}
		var spec ServiceSpec
		if err := yaml.Unmarshal(b, &spec); err != nil {
			return err
		}
		specsByID[spec.ServiceID] = spec
		return nil
	})
	if walkErr != nil {
		panic(walkErr)
	}

	if len(ordered) == 0 {
		specs := make([]ServiceSpec, 0, len(specsByID))
		for _, spec := range specsByID {
			specs = append(specs, spec)
		}
		sort.Slice(specs, func(i, j int) bool { return specs[i].ServiceID < specs[j].ServiceID })
		return specs
	}

	specs := []ServiceSpec{}
	for _, meta := range ordered {
		spec, ok := specsByID[meta.ID]
		if !ok {
			continue
		}
		specs = append(specs, spec)
	}
	return specs
}

func writeResourceDocs(docsDir string, spec ServiceSpec, version string) {
	base := spec.Name
	nav := fmt.Sprintf("[Manual](%s.md) | [Create params](%s_params_create.md) | [Modify params](%s_params_modify.md) | [Output params](%s_outputs.md) | [Operations](%s_ops.md) | [Example](%s_example.md)", base, base, base, base, base, base)

	writeFile(filepath.Join(docsDir, base+".md"), buildManualPage(spec, nav))
	writeFile(filepath.Join(docsDir, base+"_example.md"), buildExamplePage(spec, nav, version))
	writeFile(filepath.Join(docsDir, base+"_params_create.md"), buildCreateParamsPage(spec, nav))
	writeFile(filepath.Join(docsDir, base+"_params_modify.md"), buildModifyParamsPage(spec, nav))
	writeFile(filepath.Join(docsDir, base+"_outputs.md"), buildOutputsPage(spec, nav))
	writeFile(filepath.Join(docsDir, base+"_ops.md"), buildOpsPage(spec, nav, docsDir))
	writeFile(filepath.Join(docsDir, base+"_params.md"), buildParamsLandingPage(spec, nav))
}

func writeFile(path, content string) {
	if err := os.WriteFile(path, []byte(content), 0o644); err != nil {
		panic(err)
	}
}

func buildHeader(spec ServiceSpec, nav string) string {
	name := spec.ServiceDisplayName
	if name == "" {
		name = spec.Name
	}
	return fmt.Sprintf("# Resource nubes_%s\n\nService ID: `%d`\n\nService Name: %s\n\n%s\n\n", spec.Name, spec.ServiceID, name, nav)
}

func buildManualPage(spec ServiceSpec, nav string) string {
	var b strings.Builder
	b.WriteString(buildHeader(spec, nav))
	b.WriteString("## MAN\n\n")
	man := strings.TrimSpace(spec.ServiceMan)
	if man == "" {
		man = "Manual not available."
	}
	b.WriteString("<div class=\"man-content\">\n")
	b.WriteString(man)
	b.WriteString("\n</div>\n")
	return b.String()
}

func buildExamplePage(spec ServiceSpec, nav, version string) string {
	var b strings.Builder
	b.WriteString(buildHeader(spec, nav))
	b.WriteString(fmt.Sprintf("## Copy-ready manifest (`%s_main.tf`)\n\n", spec.Name))
	b.WriteString("<div class=\"copy-ready-code\"><pre><code>")
	b.WriteString(exampleBlock(spec, version))
	b.WriteString("</code></pre></div>\n\n")
	b.WriteString("## Outputs usage\n\n")
	b.WriteString("<div class=\"copy-ready-code\"><pre><code>")
	b.WriteString("# Выходные параметры можно использовать как\n")
	b.WriteString(fmt.Sprintf("nubes_%s.baza.state_params[\"имя_ключа\"]\n", spec.Name))
	b.WriteString(fmt.Sprintf("nubes_%s.baza.state_out[\"имя_ключа\"]\n", spec.Name))
	b.WriteString(fmt.Sprintf("nubes_%s.baza.state_params_flat[\"имя_ключа\"]\n", spec.Name))
	b.WriteString(fmt.Sprintf("nubes_%s.baza.state_out_flat[\"имя_ключа\"]\n", spec.Name))
	b.WriteString(fmt.Sprintf("nubes_%s.baza.vault_secrets[\"имя_ключа\"]\n", spec.Name))
	b.WriteString(fmt.Sprintf("nubes_%s.baza.vault_url\n", spec.Name))
	b.WriteString(fmt.Sprintf("nubes_%s.baza.vault_user_path\n", spec.Name))
	b.WriteString(fmt.Sprintf("nubes_%s.baza.vault_fields\n", spec.Name))
	b.WriteString("</code></pre></div>\n")
	return b.String()
}

func exampleBlock(spec ServiceSpec, version string) string {
	createParams := findParams(spec.Operations, "create")
	requiredParams, defaultParams := splitParams(createParams)

	var b strings.Builder
	b.WriteString("terraform {\n")
	b.WriteString("  required_providers {\n")
	b.WriteString("    nubes = {\n")
	b.WriteString("      source  = \"terra.k8c.ru/nubes/nubes\"\n")
	b.WriteString(fmt.Sprintf("      version = \"%s\"\n", version))
	b.WriteString("    }\n")
	b.WriteString("  }\n")
	b.WriteString("}\n\n")
	b.WriteString("# Токен доступа api_token к Nubes API  — замените на реальный.\n")
	b.WriteString("provider \"nubes\" {\n")
	b.WriteString("  api_token    = \"token_***\"\n")
	b.WriteString("  api_endpoint = \"https://deck-api.ngcloud.ru/api/v1/index.cfm\"\n")
	b.WriteString("}\n")
	b.WriteString(fmt.Sprintf("resource \"nubes_%s\" \"baza\" {\n", spec.Name))

	if len(requiredParams) > 0 {
		b.WriteString("  # TODO - обязательный параметр, задаваемый пользователем\n")
	}
	for _, p := range requiredParams {
		b.WriteString(formatParamLine(p, "  "))
	}

	if len(defaultParams) > 0 {
		b.WriteString("\n  # Параметры, имеющие значение по умолчанию, если не меняете - эти параметры не обязательно прописывать в манифесте\n")
		for _, p := range defaultParams {
			b.WriteString(formatParamLine(p, "  "))
		}
	}

	b.WriteString("}\n")
	return escapeCode(b.String())
}

func buildCreateParamsPage(spec ServiceSpec, nav string) string {
	var b strings.Builder
	b.WriteString(buildHeader(spec, nav))
	b.WriteString("## Create params\n\n")
	createParams := findParams(spec.Operations, "create")
	requiredParams, defaultParams := splitParams(createParams)

	b.WriteString("**Обязательные параметры (вводимые пользователем)**\n\n")
	b.WriteString(renderParamTable(requiredParams, true, true))

	b.WriteString("\n**Параметры, имеющие значение по умолчанию, если не меняете - эти параметры не обязательно прописывать в манифесте**\n")
	b.WriteString(renderParamTable(defaultParams, false, false))

	lifecycle := spec.Lifecycle
	if lifecycle.DeleteModeDefault != "" || lifecycle.ResumeIfExistsDefault {
		b.WriteString("\n<div class=\"lifecycle-note\">\n")
		b.WriteString("<strong>Параметры жизненного цикла (Lifecycle defaults)</strong><br/>\n")
		b.WriteString(fmt.Sprintf("По умолчанию: `delete_mode_default = %s`, `resume_if_exists_default = %v`.<br/>\n", lifecycle.DeleteModeDefault, lifecycle.ResumeIfExistsDefault))
		b.WriteString("Если для сервиса доступны операции `suspend` и `resume`, то `delete` выполняет приостановку (без удаления данных),<br/>\n")
		b.WriteString("а `apply` при необходимости возобновляет работу существующего ресурса.<br/>\n")
		b.WriteString("Менять эти значения стоит только в продвинутых сценариях — через параметры `delete_mode` и `resume_if_exists` в манифесте.\n")
		b.WriteString("</div>\n")
	}

	return b.String()
}

func buildModifyParamsPage(spec ServiceSpec, nav string) string {
	var b strings.Builder
	b.WriteString(buildHeader(spec, nav))
	b.WriteString("## Modify params\n\n")
	modifyParams := findParams(spec.Operations, "modify")
	b.WriteString(renderModifyTable(modifyParams))
	return b.String()
}

func buildOutputsPage(spec ServiceSpec, nav string) string {
	var b strings.Builder
	b.WriteString(buildHeader(spec, nav))
	b.WriteString("## Output params\n\n")
	if len(spec.Outputs.Params) == 0 {
		b.WriteString("None.\n")
		return b.String()
	}
	for _, p := range spec.Outputs.Params {
		b.WriteString(fmt.Sprintf("- `%s` (%s)\n", p.Code, p.Type))
	}
	return b.String()
}

func buildOpsPage(spec ServiceSpec, nav, docsDir string) string {
	var b strings.Builder
	b.WriteString(buildHeader(spec, nav))
	b.WriteString("## Operations\n\n")
	for _, op := range spec.Operations {
		name := op.Name
		if name == "" {
			name = op.Action
		}
		descr := strings.TrimSpace(stripHTML(op.Man))
		if descr != "" {
			descr = ": " + descr
		}
		switch op.Action {
		case "create":
			b.WriteString(fmt.Sprintf("- `%s` — Создание кластера. Параметры: [%s params](%s_params_create.md)\n", name, "Create", spec.Name))
			continue
		case "modify":
			b.WriteString(fmt.Sprintf("- `%s` — Изменение кластера. Параметры: [%s params](%s_params_modify.md)\n", name, "Modify", spec.Name))
			continue
		}

		if op.Kind == "subresource" && op.Subresource != "" {
			subFile := fmt.Sprintf("%s_%s.md", spec.Name, slug(op.Subresource))
			if fileExists(filepath.Join(docsDir, subFile)) {
				b.WriteString(fmt.Sprintf("- `%s` — %s. См. [nubes_%s_%s](%s)\n", name, strings.TrimPrefix(descr, ": "), spec.Name, slug(op.Subresource), subFile))
				continue
			}
		}
		if descr != "" {
			b.WriteString(fmt.Sprintf("- `%s` — %s\n", name, strings.TrimPrefix(descr, ": ")))
		} else {
			b.WriteString(fmt.Sprintf("- `%s`\n", name))
		}
	}
	return b.String()
}

func buildParamsLandingPage(spec ServiceSpec, nav string) string {
	var b strings.Builder
	b.WriteString(buildHeader(spec, nav))
	b.WriteString("## Parameters\n\n")
	b.WriteString(fmt.Sprintf("- [Create params](%s_params_create.md)\n", spec.Name))
	b.WriteString(fmt.Sprintf("- [Modify params](%s_params_modify.md)\n", spec.Name))
	return b.String()
}

func findParams(ops []OperationSpec, action string) []ParamSpec {
	for _, op := range ops {
		if op.Kind == "instance" && op.Action == action {
			return op.Params
		}
	}
	return nil
}

func splitParams(params []ParamSpec) ([]ParamSpec, []ParamSpec) {
	required := []ParamSpec{}
	defaults := []ParamSpec{}
	for _, p := range params {
		if hasDefault(p.Default) {
			defaults = append(defaults, p)
			continue
		}
		required = append(required, p)
	}
	return required, defaults
}

func hasDefault(value interface{}) bool {
	if value == nil {
		return false
	}
	if s, ok := value.(string); ok {
		return strings.TrimSpace(s) != ""
	}
	return true
}

func renderParamTable(params []ParamSpec, requiredTable, noDefault bool) string {
	if len(params) == 0 {
		return "None.\n"
	}
	var b strings.Builder
	tableClass := "resource-table resource-table-compact"
	if requiredTable {
		tableClass += " resource-table-required"
	}
	b.WriteString(fmt.Sprintf("<table class=\"%s\">\n", tableClass))
	if noDefault {
		b.WriteString("<thead><tr><th>ID</th><th>Code</th><th>Type</th><th>Description</th><th>Constraints</th></tr></thead>\n<tbody>\n")
	} else {
		b.WriteString("<thead><tr><th>ID</th><th>Code</th><th>Type</th><th>Default</th><th>Description</th><th>Constraints</th></tr></thead>\n<tbody>\n")
	}
	for _, p := range params {
		b.WriteString("<tr>")
		b.WriteString(fmt.Sprintf("<td>%s</td>", escapeText(formatID(p.ID))))
		b.WriteString(fmt.Sprintf("<td>%s</td>", formatCode(p.Code)))
		b.WriteString(fmt.Sprintf("<td>%s</td>", formatTypeCell(p)))
		if !noDefault {
			b.WriteString(fmt.Sprintf("<td>%s</td>", defaultCell(p.Default)))
		}
		b.WriteString(fmt.Sprintf("<td>%s</td>", escapeText(pickText(p))))
		b.WriteString(fmt.Sprintf("<td>%s</td>", escapeText(collectConstraints(p))))
		b.WriteString("</tr>\n")
	}
	b.WriteString("</tbody></table>\n")
	return b.String()
}

func renderModifyTable(params []ParamSpec) string {
	if len(params) == 0 {
		return "None.\n"
	}
	var b strings.Builder
	b.WriteString("<table class=\"resource-table resource-table-compact\">\n")
	b.WriteString("<thead><tr><th>ID</th><th>Code</th><th>Type</th><th>Description</th><th>Constraints</th></tr></thead>\n<tbody>\n")
	for _, p := range params {
		b.WriteString("<tr>")
		b.WriteString(fmt.Sprintf("<td>%s</td>", escapeText(formatID(p.ID))))
		b.WriteString(fmt.Sprintf("<td>%s</td>", formatCode(p.Code)))
		b.WriteString(fmt.Sprintf("<td>%s</td>", formatTypeCell(p)))
		b.WriteString(fmt.Sprintf("<td>%s</td>", escapeText(pickText(p))))
		b.WriteString(fmt.Sprintf("<td>%s</td>", escapeText(collectConstraints(p))))
		b.WriteString("</tr>\n")
	}
	b.WriteString("</tbody></table>\n")
	return b.String()
}

func formatParamLine(p ParamSpec, indent string) string {
	value := sampleValue(p)
	comment := strings.TrimSpace(stripHTML(p.Man))
	if comment == "" {
		comment = strings.TrimSpace(stripHTML(p.Descr))
	}
	if comment != "" {
		return fmt.Sprintf("%s%s = %s # %s\n", indent, p.Code, value, comment)
	}
	return fmt.Sprintf("%s%s = %s\n", indent, p.Code, value)
}

func sampleValue(p ParamSpec) string {
	if hasDefault(p.Default) {
		return formatLiteral(p.Default)
	}
	if len(p.ValueList) > 0 {
		return formatLiteral(p.ValueList[0])
	}
	dtype := strings.ToLower(firstType(p))
	switch {
	case strings.Contains(dtype, "bool"):
		return "false"
	case strings.Contains(dtype, "int") || strings.Contains(dtype, "number"):
		return "1"
	case strings.Contains(dtype, "json"):
		return "{}"
	}
	return "\"TODO\""
}

func formatLiteral(value interface{}) string {
	switch v := value.(type) {
	case bool:
		if v {
			return "true"
		}
		return "false"
	case int:
		return strconv.Itoa(v)
	case int64:
		return strconv.FormatInt(v, 10)
	case float64:
		return strconv.FormatFloat(v, 'f', -1, 64)
	case string:
		if strings.HasPrefix(v, "{") || strings.HasPrefix(v, "[") {
			return v
		}
		if strings.HasPrefix(v, "\"") && strings.HasSuffix(v, "\"") {
			return v
		}
		if looksLikeNumber(v) || v == "true" || v == "false" {
			return v
		}
		return fmt.Sprintf("\"%s\"", v)
	default:
		return fmt.Sprintf("\"%v\"", v)
	}
}

func looksLikeNumber(value string) bool {
	if value == "" {
		return false
	}
	if value[0] == '-' {
		value = value[1:]
	}
	for _, ch := range value {
		if ch == '.' {
			continue
		}
		if ch < '0' || ch > '9' {
			return false
		}
	}
	return true
}

func formatID(id int) string {
	if id == 0 {
		return ""
	}
	return strconv.Itoa(id)
}

func formatTypeCell(p ParamSpec) string {
	dtype := firstType(p)
	if dtype == "" {
		return ""
	}
	return "<code>" + escapeText(dtype) + "</code>"
}

func firstType(p ParamSpec) string {
	if p.DataType != "" {
		return normalizeType(p.DataType)
	}
	return normalizeType(p.Type)
}

func normalizeType(dtype string) string {
	cleaned := strings.ReplaceAll(dtype, "&gt;", ">")
	if idx := strings.Index(cleaned, ">"); idx >= 0 {
		cleaned = cleaned[:idx]
	}
	return strings.TrimSpace(cleaned)
}

func defaultCell(value interface{}) string {
	if !hasDefault(value) {
		return ""
	}
	return "<code>" + escapeText(formatLiteral(value)) + "</code>"
}

func pickText(p ParamSpec) string {
	if p.Descr == "" && p.Man == "" {
		return ""
	}
	if p.Man == "" {
		return p.Descr
	}
	if p.Descr == "" {
		return p.Man
	}
	if len(p.Man) > len(p.Descr) {
		return p.Man
	}
	return p.Descr
}

func collectConstraints(p ParamSpec) string {
	parts := []string{}
	if p.MinValue != nil {
		parts = append(parts, fmt.Sprintf("minvalue=%d", *p.MinValue))
	}
	if p.MaxValue != nil {
		parts = append(parts, fmt.Sprintf("maxvalue=%d", *p.MaxValue))
	}
	if p.Regex != "" {
		parts = append(parts, fmt.Sprintf("regex=%s", p.Regex))
	}
	if len(p.ValueList) > 0 {
		parts = append(parts, fmt.Sprintf("value_list=%s", strings.Join(p.ValueList, ", ")))
	}
	if p.Func != "" {
		parts = append(parts, fmt.Sprintf("func=%s", p.Func))
	}
	if p.RefSvcID != nil {
		parts = append(parts, fmt.Sprintf("ref_svc_id=%d", *p.RefSvcID))
	}
	if p.Unique != "" {
		parts = append(parts, fmt.Sprintf("unique_scope=%s", p.Unique))
	}
	if p.MaxLength != nil {
		parts = append(parts, fmt.Sprintf("maxlength=%d", *p.MaxLength))
	}
	if p.MinLength != nil {
		parts = append(parts, fmt.Sprintf("minlength=%d", *p.MinLength))
	}
	return strings.Join(parts, "; ")
}

func escapeText(value string) string {
	if value == "" {
		return ""
	}
	text := html.EscapeString(value)
	text = strings.ReplaceAll(text, "&lt;br/&gt;", "<br/>")
	text = strings.ReplaceAll(text, "&lt;br /&gt;", "<br/>")
	text = strings.ReplaceAll(text, "&lt;br&gt;", "<br/>")
	return text
}

func escapeCode(value string) string {
	buf := bytes.NewBuffer(nil)
	for _, line := range strings.Split(value, "\n") {
		buf.WriteString(html.EscapeString(line))
		buf.WriteString("\n")
	}
	return buf.String()
}

func formatCode(code string) string {
	if code == "" {
		return ""
	}
	if len(code) <= 40 {
		return "<strong><code class=\"code-no-wrap\">" + code + "</code></strong>"
	}
	out := []string{}
	prev := rune(0)
	for _, ch := range code {
		if ch == '_' {
			out = append(out, "_<wbr>")
			prev = ch
			continue
		}
		if prev != 0 && (unicodeIsLower(prev) || unicodeIsDigit(prev)) && unicodeIsUpper(ch) {
			out = append(out, "<wbr>")
		}
		out = append(out, string(ch))
		prev = ch
	}
	return "<strong><code class=\"code-wrap\">" + strings.Join(out, "") + "</code></strong>"
}

func unicodeIsLower(r rune) bool { return r >= 'a' && r <= 'z' }
func unicodeIsUpper(r rune) bool { return r >= 'A' && r <= 'Z' }
func unicodeIsDigit(r rune) bool { return r >= '0' && r <= '9' }

func stripHTML(value string) string {
	if value == "" {
		return ""
	}
	re := regexp.MustCompile("<[^>]+>")
	cleaned := re.ReplaceAllString(value, " ")
	cleaned = strings.Join(strings.Fields(cleaned), " ")
	return html.UnescapeString(cleaned)
}

func slug(value string) string {
	out := []rune{}
	for _, ch := range value {
		if (ch >= 'a' && ch <= 'z') || (ch >= '0' && ch <= '9') || ch == '_' || ch == '-' {
			out = append(out, ch)
		} else if ch >= 'A' && ch <= 'Z' {
			out = append(out, ch+'a'-'A')
		} else {
			out = append(out, '_')
		}
	}
	return strings.Trim(string(out), "_")
}

func fileExists(path string) bool {
	_, err := os.Stat(path)
	return err == nil
}