package permlib

import (
	"strings"

	"code.clickto.dev/weiym/permlib/pb"
)

func (e *Engine) collectPerms() []*pb.PermItem {
	seen := make(map[string]bool)
	var perms []*pb.PermItem

	add := func(code, name string) {
		if seen[code] {
			return
		}
		seen[code] = true
		if name == "" {
			name = generatePermName(code)
		}
		perms = append(perms, &pb.PermItem{Code: code, Name: name})
	}

	for _, decl := range e.staticPerms {
		add(decl.Code, decl.Name)
		dataCode := apiToDataCode(decl.Code)
		if dataCode != "" {
			add(dataCode, "")
		}
	}

	return perms
}

func apiToDataCode(apiCode string) string {
	if !strings.HasPrefix(apiCode, "api:") {
		return ""
	}
	return "data:" + apiCode[4:]
}

func generatePermName(code string) string {
	parts := strings.Split(code, ":")
	if len(parts) < 2 {
		return code
	}

	actionMap := map[string]string{
		"read":   "读取",
		"write":  "写入",
		"create": "创建",
		"update": "更新",
		"delete": "删除",
		"list":   "列表",
		"detail": "详情",
	}

	capitalize := func(s string) string {
		if len(s) == 0 {
			return s
		}
		return strings.ToUpper(s[:1]) + s[1:]
	}

	// 字段权限：data:model:field:read|write → "{Model} {field} 字段 [读取|写入]"
	if parts[0] == "data" && len(parts) == 4 {
		action := actionMap[parts[3]]
		if action == "" {
			action = parts[3]
		}
		return capitalize(parts[1]) + " " + parts[2] + " 字段" + action
	}

	// 接口/数据权限：api:model:action 或 data:model:action
	var result []string
	for i := 1; i < len(parts); i++ {
		p := parts[i]
		if mapped, ok := actionMap[p]; ok {
			result = append(result, mapped)
		} else {
			result = append(result, capitalize(p))
		}
	}

	return strings.Join(result, " ")
}