from __future__ import annotations

from dataclasses import dataclass

from sapcli.exceptions import InvalidNameError


@dataclass(frozen=True)
class ObjectTypeConfig:
    key: str
    label: str
    obj_uri_template: str
    src_uri_template: str | None
    collection_uri: str
    create_content_type: str
    has_source: bool = True
    # 存在性检查专用端点模板；为 None 时回退到 obj_uri_template。
    # 个别类型（如 tabletype）的 obj_uri 是 VIT 端点，对任意名称都返回 200，
    # 无法区分存在/不存在，因此存在性检查需走标准 DDIC 端点。
    exists_uri_template: str | None = None

    def format_obj_uri(self, name: str, **kwargs: str) -> str:
        return self.obj_uri_template.format(name=name, **kwargs)

    def format_src_uri(self, name: str, **kwargs: str) -> str | None:
        if self.src_uri_template is None:
            return None
        return self.src_uri_template.format(name=name, **kwargs)

    def format_exists_uri(self, name: str, **kwargs: str) -> str:
        """格式化存在性检查端点。无专用模板时回退到 obj_uri_template。"""
        template = self.exists_uri_template or self.obj_uri_template
        return template.format(name=name, **kwargs)

    def format_collection_uri(self, **kwargs: str) -> str:
        return self.collection_uri.format(**kwargs)


_OBJECT_TYPE_REGISTRY: dict[str, ObjectTypeConfig] = {}


def _register(cfg: ObjectTypeConfig) -> ObjectTypeConfig:
    _OBJECT_TYPE_REGISTRY[cfg.key] = cfg
    return cfg


REPORT = _register(ObjectTypeConfig(
    key="report",
    label="程序(REPORT)",
    obj_uri_template="/sap/bc/adt/programs/programs/{name}",
    src_uri_template="/sap/bc/adt/programs/programs/{name}/source/main",
    collection_uri="/sap/bc/adt/programs/programs",
    create_content_type="application/vnd.sap.adt.programs.programs.v2+xml",
))

CLASS = _register(ObjectTypeConfig(
    key="class",
    label="类(CLASS)",
    obj_uri_template="/sap/bc/adt/oo/classes/{name}",
    src_uri_template="/sap/bc/adt/oo/classes/{name}/source/main",
    collection_uri="/sap/bc/adt/oo/classes",
    create_content_type="application/vnd.sap.adt.oo.classes.v1+xml",
))

FUNCTION = _register(ObjectTypeConfig(
    key="function",
    label="函数模块(FUNCTION)",
    obj_uri_template="/sap/bc/adt/functions/groups/{group}/fmodules/{name}",
    src_uri_template="/sap/bc/adt/functions/groups/{group}/fmodules/{name}/source/main",
    collection_uri="/sap/bc/adt/functions/groups/{group}/fmodules",
    create_content_type="application/vnd.sap.adt.functions.fmodules.v1+xml",
))

FUNCTIONGROUP = _register(ObjectTypeConfig(
    key="functiongroup",
    label="函数组(FUNCTION GROUP)",
    obj_uri_template="/sap/bc/adt/functions/groups/{name}",
    src_uri_template=None,
    collection_uri="/sap/bc/adt/functions/groups",
    create_content_type="application/vnd.sap.adt.functions.groups.v2+xml",
    has_source=False,
))

INTERFACE = _register(ObjectTypeConfig(
    key="interface",
    label="接口(INTERFACE)",
    obj_uri_template="/sap/bc/adt/oo/interfaces/{name}",
    src_uri_template="/sap/bc/adt/oo/interfaces/{name}/source/main",
    collection_uri="/sap/bc/adt/oo/interfaces",
    create_content_type="application/vnd.sap.adt.oo.interfaces.v1+xml",
))

DOMAIN = _register(ObjectTypeConfig(
    key="domain",
    label="域(DOMAIN)",
    obj_uri_template="/sap/bc/adt/ddic/domains/{name}",
    src_uri_template="/sap/bc/adt/ddic/domains/{name}/source/main",
    collection_uri="/sap/bc/adt/ddic/domains",
    create_content_type="application/vnd.sap.adt.domains.v2+xml",
))

DATAELEMENT = _register(ObjectTypeConfig(
    key="dataelement",
    label="数据元素(DATA ELEMENT)",
    obj_uri_template="/sap/bc/adt/ddic/dataelements/{name}",
    src_uri_template="/sap/bc/adt/ddic/dataelements/{name}/source/main",
    collection_uri="/sap/bc/adt/ddic/dataelements",
    create_content_type="application/vnd.sap.adt.dataelements.v2+xml",
))

TABLE = _register(ObjectTypeConfig(
    key="table",
    label="透明表(TABLE)",
    obj_uri_template="/sap/bc/adt/ddic/tables/{name}",
    src_uri_template="/sap/bc/adt/ddic/tables/{name}/source/main",
    collection_uri="/sap/bc/adt/ddic/tables",
    create_content_type="application/vnd.sap.adt.ddic.tables.v1+xml",
))

STRUCTURE = _register(ObjectTypeConfig(
    key="structure",
    label="结构(STRUCTURE)",
    obj_uri_template="/sap/bc/adt/ddic/structures/{name}",
    src_uri_template="/sap/bc/adt/ddic/structures/{name}/source/main",
    collection_uri="/sap/bc/adt/ddic/structures",
    create_content_type="application/vnd.sap.adt.ddic.structures.v1+xml",
))

TABLETYPE = _register(ObjectTypeConfig(
    key="tabletype",
    label="表类型(TABLE TYPE)",
    obj_uri_template="/sap/bc/adt/vit/wb/object_type/ttypda/object_name/{name}",
    src_uri_template=None,
    collection_uri="/sap/bc/adt/ddic/tabletypes",
    create_content_type="application/vnd.sap.adt.ddic.tabletypes.v1+xml",
    has_source=False,
    # VIT obj_uri 对任意名称都返回 200，存在性检查必须走 DDIC 端点
    exists_uri_template="/sap/bc/adt/ddic/tabletypes/{name}",
))

INCLUDE = _register(ObjectTypeConfig(
    key="include",
    label="Include程序(INCLUDE)",
    obj_uri_template="/sap/bc/adt/programs/includes/{name}",
    src_uri_template="/sap/bc/adt/programs/includes/{name}/source/main",
    collection_uri="/sap/bc/adt/programs/includes",
    create_content_type="application/vnd.sap.adt.programs.includes.v2+xml",
))

CDSVIEW = _register(ObjectTypeConfig(
    key="cdsview",
    label="CDS视图(CDS VIEW)",
    # 与 commands/cds.py 和 client/_ddic.py 保持一致：/ddic/ddlsources（NW 7.40 验证可用）
    obj_uri_template="/sap/bc/adt/ddic/ddlsources/{name}",
    src_uri_template="/sap/bc/adt/ddic/ddlsources/{name}/source/main",
    collection_uri="/sap/bc/adt/ddic/ddlsources",
    create_content_type="text/plain",
))

DCL = _register(ObjectTypeConfig(
    key="dcl",
    label="访问控制(DCL)",
    # CDS Access Control，端点 /ddic/dclsources（参考 docs/dev/adt-endpoint-reference.md）
    obj_uri_template="/sap/bc/adt/ddic/dclsources/{name}",
    src_uri_template="/sap/bc/adt/ddic/dclsources/{name}/source/main",
    collection_uri="/sap/bc/adt/ddic/dclsources",
    create_content_type="text/plain",
))

DDLX = _register(ObjectTypeConfig(
    key="ddlX",
    label="元数据扩展(DDLX)",
    # Metadata Extension，端点 /ddic/metadataextensions（参考 docs/dev/adt-endpoint-reference.md）
    obj_uri_template="/sap/bc/adt/ddic/metadataextensions/{name}",
    src_uri_template="/sap/bc/adt/ddic/metadataextensions/{name}/source/main",
    collection_uri="/sap/bc/adt/ddic/metadataextensions",
    create_content_type="text/plain",
))

MESSAGECLASS = _register(ObjectTypeConfig(
    key="messageclass",
    label="消息类(MESSAGE CLASS)",
    obj_uri_template="/sap/bc/adt/oo/t100/messages/classes/{name}",
    src_uri_template=None,
    collection_uri="/sap/bc/adt/oo/t100/messages/classes",
    create_content_type="application/vnd.sap.adt.t100.message.classes.v1+xml",
    has_source=False,
))

VIEW = _register(ObjectTypeConfig(
    key="view",
    label="数据库视图(VIEW)",
    obj_uri_template="/sap/bc/adt/ddic/views/{name}",
    src_uri_template="/sap/bc/adt/ddic/views/{name}/source/main",
    collection_uri="/sap/bc/adt/ddic/views",
    create_content_type="application/vnd.sap.adt.ddic.views.v1+xml",
))

SEARCHHELP = _register(ObjectTypeConfig(
    key="searchhelp",
    label="搜索帮助(SEARCH HELP)",
    obj_uri_template="/sap/bc/adt/ddic/searchhelps/{name}",
    src_uri_template=None,
    collection_uri="/sap/bc/adt/ddic/searchhelps",
    create_content_type="application/vnd.sap.adt.ddic.searchhelps.v1+xml",
    has_source=False,
))

LOCKOBJECT = _register(ObjectTypeConfig(
    key="lockobject",
    label="锁对象(LOCK OBJECT)",
    obj_uri_template="/sap/bc/adt/ddic/lockobjects/{name}",
    src_uri_template=None,
    collection_uri="/sap/bc/adt/ddic/lockobjects",
    create_content_type="application/vnd.sap.adt.ddic.lockobjects.v1+xml",
    has_source=False,
))


def get_type_config(key: str) -> ObjectTypeConfig:
    if key not in _OBJECT_TYPE_REGISTRY:
        raise ValueError(f"不支持的对象类型: {key}")
    return _OBJECT_TYPE_REGISTRY[key]


def all_type_keys() -> list[str]:
    return list(_OBJECT_TYPE_REGISTRY.keys())


# sap-cli 类型 → SAP 传输系统 R3TR 对象代码（用于查 E071 表）。
# None 表示该类型非独立 R3TR 对象，查 E071 无意义。
_R3TR_OBJECT_CODE: dict[str, str | None] = {
    "report": "PROG",
    "class": "CLAS",
    "interface": "INTF",
    "function": None,            # 函数模块属函数组(FUGR)，非独立 R3TR
    "functiongroup": "FUGR",
    "domain": "DOMA",
    "dataelement": "DTEL",
    "table": "TABL",
    "structure": "TABL",
    "tabletype": "TTYP",
    "include": None,             # Include 属所属程序，非独立 R3TR
    "cdsview": "DDLS",
    "messageclass": "MSAG",
    "view": "VIEW",
    "searchhelp": "SHLP",
    "lockobject": "ENQU",
    "dcl": "DCLS",
    "ddlX": "DDLX",
}


def get_r3tr_object_code(key: str) -> str | None:
    """返回对象类型对应的 SAP R3TR 传输对象代码；无独立代码返回 None。"""
    return _R3TR_OBJECT_CODE.get(key)


@dataclass(frozen=True)
class ParsedName:
    obj_uri: str
    src_uri: str | None
    display_name: str
    file_base: str
    # 存在性检查专用端点；默认与 obj_uri 相同。tabletype 等类型的 obj_uri
    # 不能用于存在性检查，需走标准 DDIC 端点。
    exists_uri: str = ""


def parse_object_name(name: str, obj_type: str) -> ParsedName:
    cfg = get_type_config(obj_type)

    if obj_type == "function":
        if "/" not in name:
            raise InvalidNameError(
                "function 类型需要'函数组名/函数模块名' 格式，例如: ZGROUP/Z_MY_FUNC"
            )
        group, fm = name.split("/", 1)
        group = group.strip()
        fm = fm.strip()
        if not group or not fm:
            raise InvalidNameError("函数组名和函数模块名不能为空")
        return ParsedName(
            obj_uri=cfg.format_obj_uri(fm.lower(), group=group.lower()),
            src_uri=cfg.format_src_uri(fm.lower(), group=group.lower()),
            display_name=name,
            file_base=fm.lower(),
            exists_uri=cfg.format_exists_uri(fm.lower(), group=group.lower()),
        )

    # VIT 端点需要大写名称以返回完整元数据；去掉前导 /
    # 但 VIT 对存在性检查无效（任意名称都返回 200），exists_uri 走 DDIC 端点（小写名）
    if obj_type == "tabletype":
        clean = name.lstrip("/")
        name_upper = clean.upper()
        return ParsedName(
            obj_uri=cfg.format_obj_uri(name_upper),
            src_uri=cfg.format_src_uri(name_upper),
            display_name=clean,
            file_base=clean.lower(),
            exists_uri=cfg.format_exists_uri(clean.lower()),
        )

    name_lower = name.lower()
    return ParsedName(
        obj_uri=cfg.format_obj_uri(name_lower),
        src_uri=cfg.format_src_uri(name_lower),
        display_name=name,
        file_base=name_lower,
        exists_uri=cfg.format_exists_uri(name_lower),
    )