// Package writers — генерация Markdown-документации для ресурсов.
package writers

import (
	"bytes"
	"encoding/json"
	"fmt"
	"html"
	"os"
	"path/filepath"
	"regexp"
	"strconv"
	"strings"

	"docs-generator/internal/types"
)

// CloudOutputByServiceID глобальный кэш снепшотов облачных выходов.
var CloudOutputByServiceID = map[int]types.CloudOutputSnapshot{}

// ResourceDocs генерирует полный набор .md файлов для одного сервиса.
func ResourceDocs(docsDir string, spec types.ServiceSpec, version string, apiEndpoint string, providerSource string) {
	base := spec.Name

	navManual := fmt.Sprintf("**Manual** · [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)
	navCreate := fmt.Sprintf("[Manual](%s.md) · **Create params** · [Modify params](%s_params_modify.md) · [Output params](%s_outputs.md) · [Operations](%s_ops.md) · [Example](%s_example.md)", base, base, base, base, base)
	navModify := fmt.Sprintf("[Manual](%s.md) · [Create params](%s_params_create.md) · **Modify params** · [Output params](%s_outputs.md) · [Operations](%s_ops.md) · [Example](%s_example.md)", base, base, base, base, base)
	navOutputs := fmt.Sprintf("[Manual](%s.md) · [Create params](%s_params_create.md) · [Modify params](%s_params_modify.md) · **Output params** · [Operations](%s_ops.md) · [Example](%s_example.md)", base, base, base, base, base)
	navOps := fmt.Sprintf("[Manual](%s.md) · [Create params](%s_params_create.md) · [Modify params](%s_params_modify.md) · [Output params](%s_outputs.md) · **Operations** · [Example](%s_example.md)", base, base, base, base, base)
	navExample := 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**", base, base, base, base, base)

	WriteFile(filepath.Join(docsDir, base+".md"), buildManualPage(spec, navManual, version))
	WriteFile(filepath.Join(docsDir, base+"_example.md"), buildExamplePage(spec, navExample, version, apiEndpoint, providerSource))
	WriteFile(filepath.Join(docsDir, base+"_params_create.md"), buildCreateParamsPage(spec, navCreate, version))
	WriteFile(filepath.Join(docsDir, base+"_params_modify.md"), buildModifyParamsPage(spec, navModify, version))
	WriteFile(filepath.Join(docsDir, base+"_outputs.md"), buildOutputsPage(spec, navOutputs, version))
	WriteFile(filepath.Join(docsDir, base+"_ops.md"), buildOpsPage(spec, navOps, version, docsDir))
	WriteFile(filepath.Join(docsDir, base+"_params.md"), buildParamsLandingPage(spec, navManual, version))

	for _, srName := range CollectSubresources(spec) {
		srBase := fmt.Sprintf("%s_%s", base, Slug(srName))
		srNav := fmt.Sprintf("[%s (основной)](%s.md) | [Operations](%s_ops.md) | [%s](%s.md) | [Example](%s_example.md)",
			spec.ServiceDisplayName, base, base, Capitalize(srName), srBase, srBase)
		WriteFile(filepath.Join(docsDir, srBase+".md"), buildSubresourcePage(spec, srName, srNav, version))
		WriteFile(filepath.Join(docsDir, srBase+"_example.md"), buildSubresourceExamplePage(spec, srName, srNav, version, apiEndpoint, providerSource))
	}
}

// CollectSubresources возвращает уникальные subresource-имена.
func CollectSubresources(spec types.ServiceSpec) []string {
	seen := map[string]bool{}
	var out []string
	for _, op := range spec.Operations {
		if op.Kind == "subresource" && op.Subresource != "" {
			if !seen[op.Subresource] {
				seen[op.Subresource] = true
				out = append(out, op.Subresource)
			}
		}
	}
	return out
}

// WriteFile пишет контент в файл.
func WriteFile(path, content string) {
	if err := os.WriteFile(path, []byte(content), 0o644); err != nil {
		fmt.Fprintf(os.Stderr, "ERROR: cannot write %s: %v\n", path, err)
		os.Exit(1)
	}
}

// IndexMD генерирует index.md с группировкой по категориям.
func IndexMD(docsDir string, specs []types.ServiceSpec) {
	catMap := map[string][]types.ServiceSpec{}
	for _, s := range specs {
		cat := serviceCategory(s.Name)
		catMap[cat] = append(catMap[cat], s)
	}

	var b bytes.Buffer
	b.WriteString("# Ресурсы провайдера\n\n")

	order := []string{"Базы данных", "Очереди", "Хранилище", "K8s", "VMware", "Приложения", "Сеть", "Другие"}
	for _, cat := range order {
		svcs := catMap[cat]
		if len(svcs) == 0 {
			continue
		}
		b.WriteString(fmt.Sprintf("## %s\n\n", cat))
		b.WriteString("| ID | Ресурс | Описание |\n")
		b.WriteString("|-----|--------|----------|\n")
		for _, spec := range svcs {
			resName := "nubes_" + spec.Name
			link := fmt.Sprintf("[%s](%s.md)", resName, spec.Name)
			descr := strings.ReplaceAll(spec.ServiceDisplayName, "|", "\\|")
			b.WriteString(fmt.Sprintf("| %d | %s | %s |\n", spec.ServiceID, link, descr))
		}
		b.WriteString("\n")
	}

	outPath := filepath.Join(docsDir, "index.md")
	if err := os.WriteFile(outPath, b.Bytes(), 0o644); err != nil {
		fmt.Fprintf(os.Stderr, "Warning: failed to write index.md: %v\n", err)
	}
}

// FindParams находит параметры операции по action.
func FindParams(ops []types.OperationSpec, action string) []types.ParamSpec {
	for _, op := range ops {
		if op.Kind == "instance" && op.Action == action {
			return op.Params
		}
	}
	return nil
}

// SplitParams делит параметры на обязательные и со значением по умолчанию.
func SplitParams(params []types.ParamSpec) ([]types.ParamSpec, []types.ParamSpec) {
	required := []types.ParamSpec{}
	defaults := []types.ParamSpec{}
	for _, p := range params {
		if hasDefault(p.Default) {
			defaults = append(defaults, p)
			continue
		}
		required = append(required, p)
	}
	return required, defaults
}

// FindSubresourceParams находит параметры subresource-операции.
func FindSubresourceParams(ops []types.OperationSpec, srName, action string) []types.ParamSpec {
	for _, op := range ops {
		if op.Kind == "subresource" && op.Subresource == srName && op.Action == action {
			return op.Params
		}
	}
	return nil
}

// ===== internal helpers =====

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

func buildManualPage(spec types.ServiceSpec, nav string, version string) string {
	var b strings.Builder
	b.WriteString(buildHeader(spec, nav, version))

	// Краткое описание
	name := spec.ServiceDisplayName
	if name == "" {
		name = spec.Name
	}
	b.WriteString(fmt.Sprintf("Сервис **%s** (`nubes_%s`). См. [Create params](%s_params_create.md) для списка параметров.\n\n", name, spec.Name, spec.Name))

	// MAN в раскрывающемся блоке — DevOps читает если застрял
	man := strings.TrimSpace(spec.ServiceMan)
	if man != "" {
		b.WriteString("<details>\n<summary>Справка (MAN)</summary>\n\n")
		b.WriteString("<div class=\"man-content\" markdown=\"1\">\n\n")
		b.WriteString(htmlToMarkdown(man))
		b.WriteString("\n\n</div>\n")
		b.WriteString("</details>\n")
	}
	return b.String()
}

// htmlToMarkdown converts raw HTML to Markdown.
func htmlToMarkdown(s string) string {
	// <br/> or <br> → newline
	s = regexp.MustCompile(`<br\s*/?>`).ReplaceAllString(s, "\n")
	// <h1>...</h1> → # ...
	s = regexp.MustCompile(`<h1>(.*?)</h1>`).ReplaceAllString(s, "# $1")
	// <h2>...</h2> → ## ...
	s = regexp.MustCompile(`<h2>(.*?)</h2>`).ReplaceAllString(s, "## $1")
	// <h3>...</h3> → ### ...
	s = regexp.MustCompile(`<h3>(.*?)</h3>`).ReplaceAllString(s, "### $1")
	// <strong> or <b> → **...**
	s = regexp.MustCompile(`<(?:strong|b)>(.*?)</(?:strong|b)>`).ReplaceAllString(s, "**$1**")
	// <em> or <i> → *...*
	s = regexp.MustCompile(`<(?:em|i)>(.*?)</(?:em|i)>`).ReplaceAllString(s, "*$1*")
	// <code>...</code> → `...`
	s = regexp.MustCompile(`<code>(.*?)</code>`).ReplaceAllString(s, "`$1`")
	// <a href="...">...</a> → [...](...)
	s = regexp.MustCompile(`<a\s+href="(.*?)">(.*?)</a>`).ReplaceAllString(s, "[$2]($1)")
	// <ul> / </ul> — remove
	s = regexp.MustCompile(`</?ul>`).ReplaceAllString(s, "")
	// <li>...</li> → - ...
	s = regexp.MustCompile(`<li>(.*?)</li>`).ReplaceAllString(s, "- $1")
	// <ol> / </ol> — remove
	s = regexp.MustCompile(`</?ol>`).ReplaceAllString(s, "")
	// <p> / </p> — remove
	s = regexp.MustCompile(`</?p>`).ReplaceAllString(s, "")
	// <pre> / </pre> — remove (content stays)
	s = regexp.MustCompile(`</?pre>`).ReplaceAllString(s, "")
	// <hr> or <hr/> → ---
	s = regexp.MustCompile(`<hr\s*/?>`).ReplaceAllString(s, "\n---\n")
	// Strip remaining HTML tags
	s = regexp.MustCompile(`<[^>]+>`).ReplaceAllString(s, "")
	// Decode HTML entities
	s = html.UnescapeString(s)
	// Collapse multiple blank lines
	s = regexp.MustCompile(`\n{3,}`).ReplaceAllString(s, "\n\n")
	return strings.TrimSpace(s)
}

func buildExamplePage(spec types.ServiceSpec, nav string, version string, apiEndpoint string, providerSource string) string {
	var b strings.Builder
	b.WriteString(buildHeader(spec, nav, version))
	b.WriteString("## Минимальный пример (только обязательные параметры)\n\n")
	b.WriteString("```hcl\n")
	b.WriteString(minimalExampleBlock(spec, version, apiEndpoint, providerSource))
	b.WriteString("```\n\n")
	b.WriteString("<details><summary>Полный пример (все параметры, включая значения по умолчанию)</summary>\n\n")
	b.WriteString("```hcl\n")
	b.WriteString(exampleBlock(spec, version, apiEndpoint, providerSource))
	b.WriteString("```\n\n")
	b.WriteString("</details>\n\n")
	b.WriteString("## Использование выходных данных\n\n")
	b.WriteString("```hcl\n")
	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("```\n")

	// Реальные ключи из облака
	snapshot, ok := CloudOutputByServiceID[spec.ServiceID]
	if ok && (len(snapshot.OutPaths) > 0 || len(snapshot.VaultFields) > 0) {
		b.WriteString("\n### Реальные ключи из облака\n\n")
		b.WriteString("```hcl\n")
		for _, key := range snapshot.OutPaths {
			if strings.TrimSpace(key) == "" {
				continue
			}
			b.WriteString(fmt.Sprintf("# %s = nubes_%s.baza.state_out_flat[\"%s\"]\n", key, spec.Name, key))
		}
		for _, key := range snapshot.VaultFields {
			if strings.TrimSpace(key) == "" {
				continue
			}
			b.WriteString(fmt.Sprintf("# %s = nubes_%s.baza.vault_secrets[\"%s\"]\n", key, spec.Name, key))
		}
		b.WriteString("```\n")
	}

	return b.String()
}

func exampleBlock(spec types.ServiceSpec, version string, apiEndpoint string, providerSource 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(fmt.Sprintf("      source  = \"%s\"\n", providerSource))
	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(fmt.Sprintf("  api_endpoint = \"%s\"\n", apiEndpoint))
	b.WriteString("}\n")
	b.WriteString(fmt.Sprintf("resource \"nubes_%s\" \"baza\" {\n", spec.Name))
	b.WriteString("  resource_name = \"TODO\"\n\n")

	for _, p := range requiredParams {
		b.WriteString(formatParamOrBlock(p, "  ", true))
	}

	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(formatParamOrBlock(p, "  ", false))
		}
	}

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

// minimalExampleBlock — только required параметры без default (минимальный работающий пример).
func minimalExampleBlock(spec types.ServiceSpec, version string, apiEndpoint string, providerSource string) string {
	createParams := FindParams(spec.Operations, "create")
	var minimalParams []types.ParamSpec
	for _, p := range createParams {
		if p.Required && !hasDefault(p.Default) {
			minimalParams = append(minimalParams, p)
		}
	}

	var b strings.Builder
	b.WriteString("terraform {\n")
	b.WriteString("  required_providers {\n")
	b.WriteString("    nubes = {\n")
	b.WriteString(fmt.Sprintf("      source  = \"%s\"\n", providerSource))
	b.WriteString(fmt.Sprintf("      version = \"%s\"\n", version))
	b.WriteString("    }\n")
	b.WriteString("  }\n")
	b.WriteString("}\n\n")
	b.WriteString("provider \"nubes\" {\n")
	b.WriteString("  api_token    = \"***\"\n")
	b.WriteString(fmt.Sprintf("  api_endpoint = \"%s\"\n", apiEndpoint))
	b.WriteString("}\n")
	b.WriteString(fmt.Sprintf("resource \"nubes_%s\" \"baza\" {\n", spec.Name))
	b.WriteString("  resource_name = \"my-" + spec.Name + "\"\n\n")

	for _, p := range minimalParams {
		b.WriteString(formatParamOrBlock(p, "  ", true))
	}

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

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

	if len(createParams) > 0 {
		b.WriteString("| Параметр | Тип | Обязательный | По умолчанию | Описание | Ограничения |\n")
		b.WriteString("|----------|-----|-------------|-------------|----------|-------------|\n")
		for _, p := range createParams {
			code := formatParamCode(p.Code)
			dtype := formatTypeCell(p)
			req := "—"
			if p.Required {
				req = "**да**"
			}
			def := defaultCell(p.Default)
			desc := escapeText(pickTextTable(p))
			// Якорь-ссылка для map-fixed/array-map-fixed с вложенными параметрами
			if p.HasSubParams && len(p.SubParams) > 0 && desc == "" {
				anchor := strings.ToLower(p.Code)
				if p.IsJson {
					desc = fmt.Sprintf("[Развернуть ↓](#%s-array-map-fixed)", anchor)
				} else {
					desc = fmt.Sprintf("[Развернуть ↓](#%s-map-fixed)", anchor)
				}
			}
			constr := escapeText(collectConstraints(p))
			b.WriteString(fmt.Sprintf("| %s | %s | %s | %s | %s | %s |\n", code, dtype, req, def, desc, constr))
		}
		b.WriteString("\n")

		// Вложенные параметры (map-fixed)
		for _, p := range createParams {
			b.WriteString(renderNestedParams(p))
		}
	}

	lifecycle := spec.Lifecycle
	if lifecycle.SuspendOnDestroyDefault || lifecycle.AdoptExistingOnCreateDefault {
		b.WriteString("\n!!! danger \"Важно: поведение при destroy\"\n")
		b.WriteString(fmt.Sprintf("    По умолчанию: `suspend_on_destroy = %s`, `adopt_existing_on_create = %s`.\n", formatBoolTitle(lifecycle.SuspendOnDestroyDefault), formatBoolTitle(lifecycle.AdoptExistingOnCreateDefault)))
		b.WriteString("    \n")
		b.WriteString("    При `terraform destroy` или удалении ресурса из манифеста:\n")
		b.WriteString("    - `suspend_on_destroy=true` — инстанс переводится в `Suspend` (не удаляется).\n")
		b.WriteString("    - `suspend_on_destroy=false` — Terraform удаляет ресурс только из state.\n")
		b.WriteString("    \n")
		b.WriteString("    При `apply` флаг `adopt_existing_on_create` работает как авто-`import`:\n")
		b.WriteString("    - `false` — если ресурс уже есть, будет ошибка.\n")
		b.WriteString("    - `true` — Terraform может взять существующий инстанс под управление.\n")
		b.WriteString("    \n")
		b.WriteString("    Важно: один инстанс должен быть только в одном state. Иначе получите конфликт управления.\n")
		b.WriteString("\n")
	}

	return b.String()
}

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

func buildOutputsPage(spec types.ServiceSpec, nav string, version string) string {
	var b strings.Builder
	b.WriteString(buildHeader(spec, nav, version))
	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 {
		desc := outputDescription(p.Code)
		if desc != "" {
			b.WriteString(fmt.Sprintf("- `%s` (%s) — %s\n", p.Code, p.Type, desc))
		} else {
			b.WriteString(fmt.Sprintf("- `%s` (%s)\n", p.Code, p.Type))
		}
	}

	snapshot, ok := CloudOutputByServiceID[spec.ServiceID]
	if !ok {
		return b.String()
	}

	hasOut := len(snapshot.OutPaths) > 0
	hasVault := len(snapshot.VaultFields) > 0
	if !hasOut && !hasVault {
		return b.String()
	}

	b.WriteString("\n## Реальные поля из облака (running/suspended snapshot)\n\n")
	b.WriteString("Поля ниже получены из реальных инстансов этого сервиса в облаке.\n")
	b.WriteString("Используйте их как готовые ключи для `state_out_flat` и `vault_secrets`.\n\n")

	if hasOut {
		b.WriteString("### `state_out_flat` ключи\n\n")
		for _, key := range snapshot.OutPaths {
			if strings.TrimSpace(key) == "" {
				continue
			}
			b.WriteString(fmt.Sprintf("- `state_out_flat[\"%s\"]`\n", key))
		}
		b.WriteString("\n")
	}

	if hasVault {
		b.WriteString("### `vault_secrets` ключи\n\n")
		for _, key := range snapshot.VaultFields {
			if strings.TrimSpace(key) == "" {
				continue
			}
			b.WriteString(fmt.Sprintf("- `vault_secrets[\"%s\"]`\n", key))
		}
		b.WriteString("\n")
	}

	if spec.ServiceID == 90 && containsString(snapshot.OutPaths, "internalConnect.master") && containsString(snapshot.VaultFields, "adminUser") && containsString(snapshot.VaultFields, "adminPass") {
		b.WriteString("### Пример для связки с Lucee/NodeJS\n\n")
		b.WriteString("```hcl\n")
		b.WriteString("testds_connectionString = \"jdbc:postgresql://${nubes_postgres.db2.state_out_flat[\"internalConnect.master\"]}:5432/postgres?sslmode=require\"\n")
		b.WriteString("testds_username         = nubes_postgres.db2.vault_secrets[\"adminUser\"]\n")
		b.WriteString("testds_password         = nubes_postgres.db2.vault_secrets[\"adminPass\"]\n")
		b.WriteString("```\n")
	}

	return b.String()
}

func containsString(values []string, target string) bool {
	for _, value := range values {
		if value == target {
			return true
		}
	}
	return false
}

func buildOpsPage(spec types.ServiceSpec, nav string, version string, docsDir string) string {
	var b strings.Builder
	b.WriteString(buildHeader(spec, nav, version))
	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
		}
		if op.Kind == "subresource" {
			descrStr := strings.TrimPrefix(descr, ": ")
			if op.Subresource != "" {
				subFile := fmt.Sprintf("%s_%s.md", spec.Name, Slug(op.Subresource))
				b.WriteString(fmt.Sprintf("- `%s` — %s. См. [nubes_%s_%s](%s)\n", name, descrStr, spec.Name, Slug(op.Subresource), subFile))
			} else {
				if descrStr != "" {
					b.WriteString(fmt.Sprintf("\n#### `%s` — %s\n\n", name, descrStr))
				} else {
					b.WriteString(fmt.Sprintf("\n#### `%s`\n\n", name))
				}
				if len(op.Params) > 0 {
					b.WriteString(renderParamTable(op.Params, true, true))
					b.WriteString("\n")
				}
			}
			continue
		}

		switch op.Action {
		case "create":
			b.WriteString(fmt.Sprintf("- `%s` — Создание кластера. Параметры: [%s params](%s_params_create.md)\n", name, "Create", spec.Name))
		case "modify":
			b.WriteString(fmt.Sprintf("- `%s` — Изменение кластера. Параметры: [%s params](%s_params_modify.md)\n", name, "Modify", spec.Name))
		default:
			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 types.ServiceSpec, nav string, version string) string {
	var b strings.Builder
	b.WriteString(buildHeader(spec, nav, version))
	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 buildSubresourcePage(spec types.ServiceSpec, srName string, nav string, version string) string {
	var b strings.Builder
	srResourceName := fmt.Sprintf("nubes_%s_%s", spec.Name, Slug(srName))
	b.WriteString(fmt.Sprintf("# Resource %s\n\n", srResourceName))
	b.WriteString(fmt.Sprintf("Service: `nubes_%s` (ID: %d)\n\n", spec.Name, spec.ServiceID))

	createParams := FindSubresourceParams(spec.Operations, srName, "create")
	b.WriteString("## Create params\n\n")
	if len(createParams) > 0 {
		req, def := SplitParams(createParams)
		b.WriteString("**Обязательные параметры**\n\n")
		b.WriteString(renderParamTable(req, true, true))
		if len(def) > 0 {
			b.WriteString("\n**Параметры со значением по умолчанию**\n\n")
			b.WriteString(renderParamTable(def, false, false))
		}
	} else {
		b.WriteString("None.\n")
	}

	modifyParams := FindSubresourceParams(spec.Operations, srName, "modify")
	if len(modifyParams) > 0 {
		b.WriteString("\n## Modify params\n\n")
		b.WriteString(renderModifyTable(modifyParams))
	}

	deleteParams := FindSubresourceParams(spec.Operations, srName, "delete")
	b.WriteString("\n## Delete params\n\n")
	if len(deleteParams) > 0 {
		b.WriteString(renderParamTable(deleteParams, true, true))
	} else {
		b.WriteString("None.\n")
	}

	return b.String()
}

func buildSubresourceExamplePage(spec types.ServiceSpec, srName string, nav string, version string, apiEndpoint string, providerSource string) string {
	var b strings.Builder
	srResourceName := fmt.Sprintf("nubes_%s_%s", spec.Name, Slug(srName))
	b.WriteString(fmt.Sprintf("# Resource %s — Example\n\n", srResourceName))
	b.WriteString(fmt.Sprintf("Service: `nubes_%s` (ID: %d)\n\n", spec.Name, spec.ServiceID))
	b.WriteString(fmt.Sprintf("## Готовый манифест (`%s_%s_main.tf`)\n\n", spec.Name, Slug(srName)))
	b.WriteString("```hcl\n")

	b.WriteString("terraform {\n")
	b.WriteString("  required_providers {\n")
	b.WriteString("    nubes = {\n")
	b.WriteString(fmt.Sprintf("      source  = \"%s\"\n", providerSource))
	b.WriteString(fmt.Sprintf("      version = \"%s\"\n", version))
	b.WriteString("    }\n")
	b.WriteString("  }\n")
	b.WriteString("}\n\n")

	b.WriteString("provider \"nubes\" {\n")
	b.WriteString("  api_token    = \"token_***\"\n")
	b.WriteString(fmt.Sprintf("  api_endpoint = \"%s\"\n", apiEndpoint))
	b.WriteString("}\n\n")

	b.WriteString(fmt.Sprintf("# Родительский ресурс — nubes_%s должен быть создан заранее\n", spec.Name))
	b.WriteString(fmt.Sprintf("# resource \"nubes_%s\" \"baza\" { ... }\n\n", spec.Name))

	b.WriteString(fmt.Sprintf("resource \"%s\" \"example\" {\n", srResourceName))
	b.WriteString(fmt.Sprintf("  %s_id = nubes_%s.baza.id\n", spec.Name, spec.Name))

	createParams := FindSubresourceParams(spec.Operations, srName, "create")
	req, def := SplitParams(createParams)
	for _, p := range req {
		b.WriteString(formatParamLine(p, "  ", true))
	}
	if len(def) > 0 {
		b.WriteString("\n  # Параметры со значением по умолчанию\n")
		for _, p := range def {
			b.WriteString(formatParamLine(p, "  ", false))
		}
	}

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

// ===== formatting helpers =====

func renderParamTable(params []types.ParamSpec, requiredTable, noDefault bool) string {
	if len(params) == 0 {
		return "None.\n"
	}
	var b strings.Builder
	if noDefault {
		b.WriteString("| Code | Type | Description | Constraints |\n")
		b.WriteString("|------|------|-------------|-------------|\n")
	} else {
		b.WriteString("| Code | Type | Default | Description | Constraints |\n")
		b.WriteString("|------|------|---------|-------------|-------------|\n")
	}
	for _, p := range params {
		code := formatParamCode(p.Code)
		dtype := formatTypeCell(p)
		desc := escapeText(pickTextTable(p))
		constr := escapeText(collectConstraints(p))
		if noDefault {
			b.WriteString(fmt.Sprintf("| %s | %s | %s | %s |\n", code, dtype, desc, constr))
		} else {
			def := defaultCell(p.Default)
			b.WriteString(fmt.Sprintf("| %s | %s | %s | %s | %s |\n", code, dtype, def, desc, constr))
		}
	}
	b.WriteString("\n")
	return b.String()
}

func renderModifyTable(params []types.ParamSpec) string {
	if len(params) == 0 {
		return "None.\n"
	}
	var b strings.Builder
	b.WriteString("| Code | Type | Description | Constraints |\n")
	b.WriteString("|------|------|-------------|-------------|\n")
	for _, p := range params {
		code := formatParamCode(p.Code)
		dtype := formatTypeCell(p)
		desc := escapeText(pickTextTable(p))
		constr := escapeText(collectConstraints(p))
		b.WriteString(fmt.Sprintf("| %s | %s | %s | %s |\n", code, dtype, desc, constr))
	}
	b.WriteString("\n")
	return b.String()
}

func formatParamLine(p types.ParamSpec, indent string, requiredOnly bool) string {
	if requiredOnly && !p.Required {
		return ""
	}
	value := sampleValue(p)
	if isJsonType(p) {
		value = fmt.Sprintf("jsonencode(%s)", value)
	}
	comment := strings.TrimSpace(stripHTML(p.Descr))
	if comment == "" {
		comment = strings.TrimSpace(stripHTML(p.Man))
	}
	paramCode := ToSnake(p.Code)
	if comment != "" {
		return fmt.Sprintf("%s%s = %s # %s\n", indent, paramCode, value, comment)
	}
	return fmt.Sprintf("%s%s = %s\n", indent, paramCode, value)
}

// formatParamOrBlock форматирует параметр или вложенный HCL-блок (map-fixed).
func formatParamOrBlock(p types.ParamSpec, indent string, requiredOnly bool) string {
	if requiredOnly && !p.Required {
		return ""
	}
	// Для map-fixed генерируем вложенный HCL-блок
	if p.HasSubParams && len(p.SubParams) > 0 && !p.IsJson {
		paramCode := ToSnake(p.Code)
		var b strings.Builder
		b.WriteString(fmt.Sprintf("%s%s {\n", indent, paramCode))
		for _, sp := range p.SubParams {
			spVal := sampleValue(sp)
			if isJsonType(sp) {
				spVal = fmt.Sprintf("jsonencode(%s)", spVal)
			}
			spCode := ToSnake(sp.Code)
			spComment := strings.TrimSpace(stripHTML(sp.Descr))
			if spComment == "" {
				spComment = strings.TrimSpace(stripHTML(sp.Man))
			}
			if spComment != "" {
				b.WriteString(fmt.Sprintf("%s  %s = %s # %s\n", indent, spCode, spVal, spComment))
			} else {
				b.WriteString(fmt.Sprintf("%s  %s = %s\n", indent, spCode, spVal))
			}
		}
		b.WriteString(fmt.Sprintf("%s}\n", indent))
		return b.String()
	}
	// Для array-map-fixed генерируем dynamic блок
	if p.HasSubParams && len(p.SubParams) > 0 && p.IsJson {
		paramCode := ToSnake(p.Code)
		var b strings.Builder
		b.WriteString(fmt.Sprintf("%s%s {\n", indent, paramCode))
		b.WriteString(fmt.Sprintf("%s  # Каждый элемент массива — объект с полями:\n", indent))
		for _, sp := range p.SubParams {
			spVal := sampleValue(sp)
			if isJsonType(sp) {
				spVal = fmt.Sprintf("jsonencode(%s)", spVal)
			}
			spCode := ToSnake(sp.Code)
			spComment := strings.TrimSpace(stripHTML(sp.Descr))
			if spComment == "" {
				spComment = strings.TrimSpace(stripHTML(sp.Man))
			}
			if spComment != "" {
				b.WriteString(fmt.Sprintf("%s  %s = %s # %s\n", indent, spCode, spVal, spComment))
			} else {
				b.WriteString(fmt.Sprintf("%s  %s = %s\n", indent, spCode, spVal))
			}
		}
		b.WriteString(fmt.Sprintf("%s}\n", indent))
		return b.String()
	}
	return formatParamLine(p, indent, requiredOnly)
}

func sampleValue(p types.ParamSpec) string {
	if hasDefault(p.Default) {
		return formatLiteral(p.Default)
	}
	if len(p.ValueList) > 0 {
		return "\"TODO\""
	}
	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 types.ParamSpec) string {
	dtype := firstType(p)
	if dtype == "" {
		return ""
	}
	return "`" + dtype + "`"
}

func firstType(p types.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 isJsonType(p types.ParamSpec) bool {
	return strings.Contains(strings.ToLower(firstType(p)), "json")
}

func defaultCell(value interface{}) string {
	if !hasDefault(value) {
		return ""
	}
	if s, ok := value.(string); ok {
		return "`" + s + "`"
	}
	return "`" + formatLiteral(value) + "`"
}

func pickTextTable(p types.ParamSpec) string {
	if p.Man != "" {
		return p.Man
	}
	return p.Descr
}

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

func outputDescription(code string) string {
	switch code {
	case "state_params":
		return "параметры, отправленные в API при создании/изменении"
	case "state_out":
		return "ответ API с результатами/выходными значениями"
	case "state_params_flat":
		return "параметры в плоском виде (ключи с путями)"
	case "state_out_flat":
		return "ответы в плоском виде (ключи с путями)"
	case "vault_secrets":
		return "секреты, записанные в Vault для ресурса"
	case "vault_url":
		return "адрес Vault для ресурса"
	case "vault_user_path":
		return "путь пользователя в Vault"
	case "vault_fields":
		return "список ключей доступных секретов"
	default:
		return ""
	}
}

func formatBoolTitle(value bool) string {
	if value {
		return "True"
	}
	return "False"
}

func collectConstraints(p types.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("Допустимые значения: %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/>")
	// Escape pipe for markdown tables
	text = strings.ReplaceAll(text, "|", "\\|")
	// Replace literal newlines with <br/> for markdown table cells
	text = strings.ReplaceAll(text, "\n", "<br/>")
	return text
}

func formatParamCode(code string) string {
	snake := ToSnake(code)
	if snake == "" {
		return ""
	}
	return "**`" + snake + "`**"
}

// ToSnake конвертирует CamelCase → snake_case.
func ToSnake(value string) string {
	if value == "" {
		return ""
	}
	var out []rune
	lastUnderscore := false
	prevLowerOrDigit := false
	for _, r := range value {
		if r >= 'A' && r <= 'Z' {
			if prevLowerOrDigit && !lastUnderscore {
				out = append(out, '_')
			}
			out = append(out, r+'a'-'A')
			lastUnderscore = false
			prevLowerOrDigit = false
			continue
		}
		if (r >= 'a' && r <= 'z') || (r >= '0' && r <= '9') {
			out = append(out, r)
			lastUnderscore = false
			prevLowerOrDigit = true
			continue
		}
		if !lastUnderscore && len(out) > 0 {
			out = append(out, '_')
			lastUnderscore = true
		}
		prevLowerOrDigit = false
	}
	return strings.Trim(string(out), "_")
}

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)
}

// Slug нормализует строку для использования в URL/имени файла.
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), "_")
}

// Capitalize делает первую букву заглавной.
func Capitalize(s string) string {
	if s == "" {
		return s
	}
	return strings.ToUpper(s[:1]) + s[1:]
}

// LoadCloudOutputSnapshot загружает снепшот облачных выходов.
func LoadCloudOutputSnapshot(root string) map[int]types.CloudOutputSnapshot {
	out := map[int]types.CloudOutputSnapshot{}
	base := filepath.Join(root, "docs", "70_api")
	entries, err := os.ReadDir(base)
	if err != nil {
		return out
	}

	latestDir := ""
	for _, entry := range entries {
		if !entry.IsDir() {
			continue
		}
		name := entry.Name()
		if strings.HasPrefix(name, "output_inventory_snapshot_") {
			if name > latestDir {
				latestDir = name
			}
		}
	}
	if latestDir == "" {
		return out
	}

	path := filepath.Join(base, latestDir, "running_suspended_output_fields_for_docs.json")
	b, err := os.ReadFile(path)
	if err != nil {
		return out
	}

	var items []types.CloudOutputSnapshot
	if err := json.Unmarshal(b, &items); err != nil {
		return out
	}

	for _, item := range items {
		out[item.ServiceID] = item
	}

	return out
}

// renderNestedParams рендерит вложенные параметры (map-fixed/array-map-fixed).
func renderNestedParams(p types.ParamSpec) string {
	if !p.HasSubParams || len(p.SubParams) == 0 {
		return ""
	}
	var b strings.Builder
	label := p.Code
	if p.IsJson {
		label += " (array-map-fixed) — элемент"
	} else {
		label += " (map-fixed)"
	}
	b.WriteString(fmt.Sprintf("\n### %s\n\n", label))
	b.WriteString("| Code | Type | Required | Default | Description | Constraints |\n")
	b.WriteString("|------|------|----------|---------|-------------|-------------|\n")
	for _, sp := range p.SubParams {
		req := "no"
		if sp.Required {
			req = "**yes**"
		}
		code := formatParamCode(sp.Code)
		dtype := formatTypeCell(sp)
		def := defaultCell(sp.Default)
		desc := escapeText(pickTextTable(sp))
		constr := escapeText(collectConstraints(sp))
		b.WriteString(fmt.Sprintf("| %s | %s | %s | %s | %s | %s |\n", code, dtype, req, def, desc, constr))
	}
	b.WriteString("\n")
	return b.String()
}

// serviceCategory возвращает категорию для сервиса.
func serviceCategory(name string) string {
	cats := map[string]string{
		"postgres": "Базы данных", "redis": "Базы данных", "mongodb": "Базы данных",
		"mariadb": "Базы данных", "clickhouse": "Базы данных",
		"rabbitmq": "Очереди", "kafka": "Очереди",
		"s3": "Хранилище", "s3bucket": "Хранилище", "nextcloud": "Хранилище",
		"k8s_velero": "K8s", "k8s_sthutrval_cluster": "K8s", "k8s_openbao": "K8s",
		"vc_mgmt_sthutrval_cluster": "K8s",
		"vc_org":                    "VMware", "vc_vdc": "VMware", "vc_nsxt": "VMware",
		"vcexternalip": "VMware", "vapp": "VMware", "vc_vm_v2": "VMware",
		"vc_vm_v3": "VMware", "vc_vdc_group": "VMware",
		"flask": "Приложения", "nodejs": "Приложения", "lucee": "Приложения",
		"http": "Приложения", "gitea": "Приложения", "superset": "Приложения",
		"pgadmin": "Приложения", "harbor": "Приложения", "akhq": "Приложения",
		"llm_ai": "Приложения", "template": "Приложения", "dummy": "Приложения",
		"valo_tenant": "Приложения",
		"zones_v2":    "Сеть", "dnsrecord": "Сеть",
	}
	if cat, ok := cats[name]; ok {
		return cat
	}
	return "Другие"
}

// WriteNavFragment генерирует _nav_fragment.yml для mkdocs sidebar.
func WriteNavFragment(docsDir string, specs []types.ServiceSpec) {
	catMap := map[string][]types.ServiceSpec{}
	for _, s := range specs {
		cat := serviceCategory(s.Name)
		catMap[cat] = append(catMap[cat], s)
	}

	var b bytes.Buffer
	b.WriteString("# auto-generated by docs-generator — DO NOT EDIT\n")
	b.WriteString("resources_nav:\n")

	order := []string{"Базы данных", "Очереди", "Хранилище", "K8s", "VMware", "Приложения", "Сеть", "Другие"}
	for _, cat := range order {
		svcs := catMap[cat]
		if len(svcs) == 0 {
			continue
		}
		b.WriteString(fmt.Sprintf("  - %s:\n", cat))
		for _, s := range svcs {
			disp := s.ServiceDisplayName
			if disp == "" {
				disp = s.Name
			}
			b.WriteString(fmt.Sprintf("    - %s:\n", disp))
			b.WriteString(fmt.Sprintf("      - Обзор: %s.md\n", s.Name))
			b.WriteString(fmt.Sprintf("      - Параметры создания: %s_params_create.md\n", s.Name))
			b.WriteString(fmt.Sprintf("      - Параметры изменения: %s_params_modify.md\n", s.Name))
			b.WriteString(fmt.Sprintf("      - Выходные данные: %s_outputs.md\n", s.Name))
			b.WriteString(fmt.Sprintf("      - Операции: %s_ops.md\n", s.Name))
			b.WriteString(fmt.Sprintf("      - Пример: %s_example.md\n", s.Name))
		}
	}

	outPath := filepath.Join(docsDir, "_nav_fragment.yml")
	if err := os.WriteFile(outPath, b.Bytes(), 0o644); err != nil {
		fmt.Fprintf(os.Stderr, "Warning: failed to write _nav_fragment.yml: %v\n", err)
	}
}