# Copyright (c) 2019-2023, Manfred Moitzi
# License: MIT License
from __future__ import annotations
from typing import TYPE_CHECKING, Optional
import logging

from ezdxf.lldxf import validator
from ezdxf.lldxf.attributes import (
    DXFAttr,
    DXFAttributes,
    DefSubclass,
    RETURN_DEFAULT,
    group_code_mapping,
)
from ezdxf.lldxf.const import (
    DXF12,
    SUBCLASS_MARKER,
    DXF2007,
    DXFInternalEzdxfError,
)
from ezdxf.entities.dxfentity import base_class, SubclassProcessor, DXFEntity
from ezdxf.entities.layer import acdb_symbol_table_record
from .factory import register_entity

if TYPE_CHECKING:
    from ezdxf.audit import Auditor
    from ezdxf.entities import DXFGraphic, Block, EndBlk
    from ezdxf.entities import DXFNamespace
    from ezdxf.entitydb import EntitySpace
    from ezdxf.layouts import BlockLayout
    from ezdxf.lldxf.tagwriter import AbstractTagWriter
    from ezdxf import xref

__all__ = ["BlockRecord"]
logger = logging.getLogger("ezdxf")

acdb_blockrec = DefSubclass(
    "AcDbBlockTableRecord",
    {
        "name": DXFAttr(2, validator=validator.is_valid_block_name),
        # handle to associated DXF LAYOUT object
        "layout": DXFAttr(340, default="0"),
        # 0 = can not explode; 1 = can explode
        "explode": DXFAttr(
            280,
            default=1,
            dxfversion=DXF2007,
            validator=validator.is_integer_bool,
            fixer=RETURN_DEFAULT,
        ),
        # 0 = scale non uniformly; 1 = scale uniformly
        "scale": DXFAttr(
            281,
            default=0,
            dxfversion=DXF2007,
            validator=validator.is_integer_bool,
            fixer=RETURN_DEFAULT,
        ),
        # see ezdxf/units.py
        "units": DXFAttr(
            70,
            default=0,
            dxfversion=DXF2007,
            validator=validator.is_in_integer_range(0, 25),
            fixer=RETURN_DEFAULT,
        ),
        # 310: Binary data for bitmap preview (optional) - removed (ignored) by ezdxf
    },
)
acdb_blockrec_group_codes = group_code_mapping(acdb_blockrec)

# optional handles to existing block references in DXF2000+
# 2: name
# 340: explode
# 102: "{BLKREFS"
# 331: handle to INSERT
# ...
# 102: "}"


# optional XDATA for all DXF versions
# 1000: "ACAD"
# 1001: "DesignCenter Data" (optional)
# 1002: "{"
# 1070: Autodesk Design Center version number
# 1070: Insert units: like 'units'
# 1002: "}"


@register_entity
class BlockRecord(DXFEntity):
    """DXF BLOCK_RECORD table entity

    BLOCK_RECORD is the hard owner of all entities in BLOCK definitions, this
    means owner tag of entities is handle of BLOCK_RECORD.

    """

    DXFTYPE = "BLOCK_RECORD"
    DXFATTRIBS = DXFAttributes(base_class, acdb_symbol_table_record, acdb_blockrec)

    def __init__(self) -> None:
        from ezdxf.entitydb import EntitySpace

        super().__init__()
        # Store entities in the block_record instead of BlockLayout and Layout,
        # because BLOCK_RECORD is also the hard owner of all the entities.
        self.entity_space = EntitySpace()
        self.block: Optional[Block] = None
        self.endblk: Optional[EndBlk] = None
        # stores also the block layout structure
        self.block_layout: Optional[BlockLayout] = None

    def set_block(self, block: Block, endblk: EndBlk):
        self.block = block
        self.endblk = endblk
        self.block.dxf.owner = self.dxf.handle
        self.endblk.dxf.owner = self.dxf.handle

    def set_entity_space(self, entity_space: EntitySpace) -> None:
        self.entity_space = entity_space

    def rename(self, name: str) -> None:
        assert self.block is not None
        self.dxf.name = name
        self.block.dxf.name = name

    def load_dxf_attribs(
        self, processor: Optional[SubclassProcessor] = None
    ) -> DXFNamespace:
        dxf = super().load_dxf_attribs(processor)
        if processor:
            processor.simple_dxfattribs_loader(dxf, acdb_blockrec_group_codes)  # type: ignore
        return dxf

    def export_entity(self, tagwriter: AbstractTagWriter) -> None:
        super().export_entity(tagwriter)
        if tagwriter.dxfversion == DXF12:
            raise DXFInternalEzdxfError("Exporting BLOCK_RECORDS for DXF R12.")
        tagwriter.write_tag2(SUBCLASS_MARKER, acdb_symbol_table_record.name)
        tagwriter.write_tag2(SUBCLASS_MARKER, acdb_blockrec.name)

        self.dxf.export_dxf_attribs(
            tagwriter,
            [
                "name",
                "layout",
                "units",
                "explode",
                "scale",
            ],
        )

    def export_block_definition(self, tagwriter: AbstractTagWriter) -> None:
        """Exports the BLOCK entity, followed by all content entities and finally the
        ENDBLK entity, except for the *Model_Space and *Paper_Space blocks, their
        entities are stored in the ENTITIES section.

        """
        assert self.block is not None
        assert self.endblk is not None
        if self.block_layout is not None:
            self.block_layout.update_block_flags()
        self.block.export_dxf(tagwriter)
        if not (self.is_modelspace or self.is_active_paperspace):
            self.entity_space.export_dxf(tagwriter)
        self.endblk.export_dxf(tagwriter)

    def register_resources(self, registry: xref.Registry) -> None:
        """Register required resources to the resource registry."""
        assert self.doc is not None, "BLOCK_RECORD entity must be assigned to document"
        assert self.doc.entitydb is not None, "entity database required"
        super().register_resources(registry)
        key = self.dxf.handle
        assert key in self.doc.entitydb, "invalid BLOCK_RECORD handle"

        if self.block is not None:
            registry.add_entity(self.block, block_key=key)
        else:
            raise DXFInternalEzdxfError(
                f"BLOCK entity in BLOCK_RECORD #{key} is invalid"
            )
        if self.endblk is not None:
            registry.add_entity(self.endblk, block_key=key)
        else:
            raise DXFInternalEzdxfError(
                f"ENDBLK entity in BLOCK_RECORD #{key} is invalid"
            )
        for e in self.entity_space:
            registry.add_entity(e, block_key=key)

    def map_resources(self, clone: DXFEntity, mapping: xref.ResourceMapper) -> None:
        """Translate resources from self to the copied entity."""
        assert isinstance(clone, BlockRecord)
        super().map_resources(clone, mapping)

        assert self.block is not None
        mapping.map_resources_of_copy(self.block)

        assert self.endblk is not None
        mapping.map_resources_of_copy(self.endblk)

        for entity in self.entity_space:
            mapping.map_resources_of_copy(entity)

    def destroy(self):
        """Destroy associated data:

            - BLOCK
            - ENDBLK
            - all entities stored in this block definition

        Does not destroy the linked LAYOUT entity, this is the domain of the
        :class:`Layouts` object, which also should initiate the destruction of
        'this' BLOCK_RECORD.

        """
        if not self.is_alive:
            return

        self.block.destroy()
        self.endblk.destroy()
        for entity in self.entity_space:
            entity.destroy()

        # remove attributes to find invalid access after death
        del self.block
        del self.endblk
        del self.block_layout
        super().destroy()

    @property
    def is_active_paperspace(self) -> bool:
        """``True`` if is "active" paperspace layout."""
        return self.dxf.name.lower() == "*paper_space"

    @property
    def is_any_paperspace(self) -> bool:
        """``True`` if is any kind of paperspace layout."""
        return self.dxf.name.lower().startswith("*paper_space")

    @property
    def is_modelspace(self) -> bool:
        """``True`` if is the modelspace layout."""
        return self.dxf.name.lower() == "*model_space"

    @property
    def is_any_layout(self) -> bool:
        """``True`` if is any kind of modelspace or paperspace layout."""
        return self.is_modelspace or self.is_any_paperspace

    @property
    def is_block_layout(self) -> bool:
        """``True`` if not any kind of modelspace or paperspace layout, just a
        regular block definition.
        """
        return not self.is_any_layout

    @property
    def is_xref(self) -> bool:
        """``True`` if represents an XREF (external reference) or XREF_OVERLAY."""
        if self.block is not None:
            return bool(self.block.dxf.flags & 12)
        return False

    def add_entity(self, entity: DXFGraphic) -> None:
        """Add an existing DXF entity to BLOCK_RECORD.

        Args:
            entity: :class:`DXFGraphic`

        """
        # assign layout
        try:
            entity.set_owner(self.dxf.handle, paperspace=int(self.is_any_paperspace))
        except AttributeError:
            logger.debug(f"Unexpected DXF entity {str(entity)} in {str(self.block)}")
        # Add unexpected entities also to the entity space - auditor should fix
        # errors!
        self.entity_space.add(entity)

    def unlink_entity(self, entity: DXFGraphic) -> None:
        """Unlink `entity` from BLOCK_RECORD.

        Removes `entity` just from  entity space but not from the drawing
        database.

        Args:
            entity: :class:`DXFGraphic`

        """
        if entity.is_alive:
            self.entity_space.remove(entity)
            try:
                entity.set_owner(None)
            except AttributeError:
                pass  # unsupported entities as DXFTagStorage

    def delete_entity(self, entity: DXFGraphic) -> None:
        """Delete `entity` from BLOCK_RECORD entity space and drawing database.

        Args:
            entity: :class:`DXFGraphic`

        """
        self.unlink_entity(entity)  # 1. unlink from entity space
        entity.destroy()

    def audit(self, auditor: Auditor) -> None:
        """Validity check. (internal API)"""
        if not self.is_alive:
            return
        super().audit(auditor)
        self.entity_space.audit(auditor)
