package main

import (
	"net/http"
	"sort"
)

// schema.go —— 可配置项总目录（给 agent 用）
//
// 目的：让 agent/脚本不必猜就有据可依——把所有可配置项连同**怎么改**（方法、路径、
// 请求体字段）一次性暴露出来。人用后台界面，agent 用这里的接口，改的是同一份数据。
//
// GET /api/schema  →  {"note":…,"items":[…],"resources":[…]}
//
// items      : 单值配置项（站点信息、认证页/门户页文案、备案号…），读用 GET、写用 POST。
// resources  : 结构化资源（导航分组与条目、服务转发路由表、门户卡片、壁纸、门户口令、历史…）。

// pageInfoFields 描述 conf.yml → pageInfo 下所有可配置文案字段。
// 列全"即使当前为空"的字段，agent 才能发现它们的存在。
var pageInfoFields = []struct{ Key, Label, Hint string }{
	{"title", "站点标题", "浏览器标题与导航页标题"},
	{"description", "站点描述", "导航页副标题/搜索页描述"},
	{"authTitle", "登录页标题", "留空回落内置默认"},
	{"authSubtitle", "登录页副标题", "留空回落内置默认"},
	{"authLogo", "登录页徽标", "短文字，如 JF"},
	{"portalTitle", "门户页浏览器标题", "留空回落内置默认"},
	{"heroTitle", "门户页主标题", "留空回落内置默认"},
	{"heroSubtitle", "门户页副标题", "留空回落内置默认"},
	{"icp", "ICP 备案号", "显示于各页页脚；被代理页面也会注入"},
	{"gongan", "公安备案号", "可选，显示于页脚"},
	{"footer", "自定义页脚 HTML", "高级：整段替换页脚内容"},
	{"navLinks", "页脚导航链接数组", "数组，元素形如 {name,url}"},
}

type schemaItem struct {
	Key   string `json:"key"`
	Label string `json:"label"`
	Type  string `json:"type"`
	Value any    `json:"value"`
	Hint  string `json:"hint,omitempty"`
	Write struct {
		Method string `json:"method"`
		Path   string `json:"path"`
		Body   any    `json:"bodyExample"`
	} `json:"write"`
}

type schemaResource struct {
	ID    string `json:"id"`
	Label string `json:"label"`
	Read  struct {
		Method string `json:"method"`
		Path   string `json:"path"`
	} `json:"read"`
	Write struct {
		Method string `json:"method"`
		Path   string `json:"path"`
		Body   any    `json:"bodyExample,omitempty"`
	} `json:"write"`
	Hint string `json:"hint,omitempty"`
}

func newSchemaItem(key, label, typ string, value any, hint, path string, body any) schemaItem {
	it := schemaItem{Key: key, Label: label, Type: typ, Value: value, Hint: hint}
	it.Write.Method = http.MethodPost
	it.Write.Path = path
	it.Write.Body = body
	return it
}

// handleSchema 返回全部可配置项及其写入口，供 agent 直接按图配置。
func handleSchema(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		jsonErr(w, 405, "只支持 GET")
		return
	}
	info := map[string]any{}
	if cfg, err := loadConfig(); err == nil && cfg != nil && cfg.PageInfo != nil {
		info = cfg.PageInfo
	}

	items := make([]schemaItem, 0, len(pageInfoFields))
	for _, f := range pageInfoFields {
		typ := "string"
		if f.Key == "navLinks" {
			typ = "array"
		}
		items = append(items, newSchemaItem(
			"pageInfo."+f.Key, f.Label, typ, info[f.Key], f.Hint,
			"/api/pageinfo", map[string]any{f.Key: "<新值>"},
		))
	}
	// 实际存在于配置但未在 catalog 里登记的键也一并暴露（避免"改了看不到"）
	var extra []string
	for k := range info {
		known := false
		for _, f := range pageInfoFields {
			if f.Key == k {
				known = true
				break
			}
		}
		if !known {
			extra = append(extra, k)
		}
	}
	sort.Strings(extra)
	for _, k := range extra {
		items = append(items, newSchemaItem("pageInfo."+k, "自定义键 "+k, "any", info[k], "配置里已存在的额外键",
			"/api/pageinfo", map[string]any{k: "<新值>"}))
	}

	res := func(id, label, readPath, writePath string, body any, hint string) schemaResource {
		var sr schemaResource
		sr.ID, sr.Label, sr.Hint = id, label, hint
		sr.Read.Method, sr.Read.Path = http.MethodGet, readPath
		sr.Write.Method, sr.Write.Path = http.MethodPost, writePath
		sr.Write.Body = body
		return sr
	}
	resources := []schemaResource{
		res("navSections", "导航分组与条目", "/api/sections", "/api/item",
			map[string]any{"name": "服务名", "url": "https://…", "section": "常用服务", "icon": "auto", "description": "说明"},
			"分组：/api/section(POST 新建、PUT 改名)、/api/section/update、DELETE /api/section；条目：/api/item(POST 新建)、/api/item/delete"),
		res("gatewayRoutes", "服务转发路由表", "/api/gateway/routes", "/api/gateway/routes",
			map[string]any{"host": "app.example.com", "upstream": "http://127.0.0.1:3000", "requireLogin": true, "websocket": false, "maxBodyMB": 64, "kind": "proxy", "navEnabled": true, "navSection": "常用服务", "navName": "我的应用"},
			"写完后必须 POST /api/gateway/apply 才会生效（内部会 nginx -t 校验，失败保留旧配置）。导入现有 nginx 配置：POST /api/gateway/import"),
		res("portalCards", "门户页服务卡片 HTML", "/api/portal-cards", "/api/portal-cards",
			map[string]any{"html": "<a class=\"card\" href=\"https://example.com\">示例</a>"},
			"替换门户页 <!--NAVI_CARDS_START/END--> 之间的内容；空串=恢复内置卡片。整页替换可写数据卷 portal/index.html"),
		res("wallpaper", "导航页壁纸", "/api/wallpaper", "/api/wallpaper",
			map[string]any{"url": "https://…/wall.jpg"},
			"置空字符串表示移除壁纸；深浅色模式下都会保留壁纸"),
		res("portalAuth", "统一登录账号", "/api/portal-auth", "/api/portal-auth",
			map[string]any{"username": "admin", "password": "<新口令>"},
			"口令以加盐哈希存数据卷，改完旧会话失效"),
		res("history", "浏览器历史记录", "/api/history", "/api/history/item",
			nil,
			"删除单条：DELETE /api/history/item?url=…；清空：DELETE /api/history；同步接口 /api/history/sync 用 NAVI_SYNC_TOKEN"),
		res("reload", "重载导航配置", "/api/sync-info", "/api/reload", nil,
			"改完 conf.yml 或需要重建导航分区时调用"),
		res("icon", "上传图标", "/api/schema", "/api/icon", nil,
			"multipart/form-data，字段名 file；支持 png/svg/jpg/ico"),
	}

	jsonResp(w, map[string]any{
		"note":      "所有可配置项集中于此。读用 GET；写用 POST，需 Authorization: Bearer <NAVI_ADMIN_TOKEN>（后台页面已登录则可直接用界面）。结构化资源的写入口见 resources。",
		"items":     items,
		"resources": resources,
	})
}