"""Table-related objects such as Table and Cell."""

from __future__ import annotations

from typing import TYPE_CHECKING, Iterator

from pptx.dml.fill import FillFormat
from pptx.oxml.table import TcRange
from pptx.shapes import Subshape
from pptx.text.text import TextFrame
from pptx.util import Emu, lazyproperty

if TYPE_CHECKING:
    from pptx.enum.text import MSO_VERTICAL_ANCHOR
    from pptx.oxml.table import CT_Table, CT_TableCell, CT_TableCol, CT_TableRow
    from pptx.parts.slide import BaseSlidePart
    from pptx.shapes.graphfrm import GraphicFrame
    from pptx.types import ProvidesPart
    from pptx.util import Length


class Table(object):
    """A DrawingML table object.

    Not intended to be constructed directly, use
    :meth:`.Slide.shapes.add_table` to add a table to a slide.
    """

    def __init__(self, tbl: CT_Table, graphic_frame: GraphicFrame):
        super(Table, self).__init__()
        self._tbl = tbl
        self._graphic_frame = graphic_frame

    def cell(self, row_idx: int, col_idx: int) -> _Cell:
        """Return cell at `row_idx`, `col_idx`.

        Return value is an instance of |_Cell|. `row_idx` and `col_idx` are zero-based, e.g.
        cell(0, 0) is the top, left cell in the table.
        """
        return _Cell(self._tbl.tc(row_idx, col_idx), self)

    @lazyproperty
    def columns(self) -> _ColumnCollection:
        """|_ColumnCollection| instance for this table.

        Provides access to |_Column| objects representing the table's columns. |_Column| objects
        are accessed using list notation, e.g. `col = tbl.columns[0]`.
        """
        return _ColumnCollection(self._tbl, self)

    @property
    def first_col(self) -> bool:
        """When `True`, indicates first column should have distinct formatting.

        Read/write. Distinct formatting is used, for example, when the first column contains row
        headings (is a side-heading column).
        """
        return self._tbl.firstCol

    @first_col.setter
    def first_col(self, value: bool):
        self._tbl.firstCol = value

    @property
    def first_row(self) -> bool:
        """When `True`, indicates first row should have distinct formatting.

        Read/write. Distinct formatting is used, for example, when the first row contains column
        headings.
        """
        return self._tbl.firstRow

    @first_row.setter
    def first_row(self, value: bool):
        self._tbl.firstRow = value

    @property
    def horz_banding(self) -> bool:
        """When `True`, indicates rows should have alternating shading.

        Read/write. Used to allow rows to be traversed more easily without losing track of which
        row is being read.
        """
        return self._tbl.bandRow

    @horz_banding.setter
    def horz_banding(self, value: bool):
        self._tbl.bandRow = value

    def iter_cells(self) -> Iterator[_Cell]:
        """Generate _Cell object for each cell in this table.

        Each grid cell is generated in left-to-right, top-to-bottom order.
        """
        return (_Cell(tc, self) for tc in self._tbl.iter_tcs())

    @property
    def last_col(self) -> bool:
        """When `True`, indicates the rightmost column should have distinct formatting.

        Read/write. Used, for example, when a row totals column appears at the far right of the
        table.
        """
        return self._tbl.lastCol

    @last_col.setter
    def last_col(self, value: bool):
        self._tbl.lastCol = value

    @property
    def last_row(self) -> bool:
        """When `True`, indicates the bottom row should have distinct formatting.

        Read/write. Used, for example, when a totals row appears as the bottom row.
        """
        return self._tbl.lastRow

    @last_row.setter
    def last_row(self, value: bool):
        self._tbl.lastRow = value

    def notify_height_changed(self) -> None:
        """Called by a row when its height changes.

        Triggers the graphic frame to recalculate its total height (as the sum of the row
        heights).
        """
        new_table_height = Emu(sum([row.height for row in self.rows]))
        self._graphic_frame.height = new_table_height

    def notify_width_changed(self) -> None:
        """Called by a column when its width changes.

        Triggers the graphic frame to recalculate its total width (as the sum of the column
        widths).
        """
        new_table_width = Emu(sum([col.width for col in self.columns]))
        self._graphic_frame.width = new_table_width

    @property
    def part(self) -> BaseSlidePart:
        """The package part containing this table."""
        return self._graphic_frame.part

    @lazyproperty
    def rows(self):
        """|_RowCollection| instance for this table.

        Provides access to |_Row| objects representing the table's rows. |_Row| objects are
        accessed using list notation, e.g. `col = tbl.rows[0]`.
        """
        return _RowCollection(self._tbl, self)

    @property
    def vert_banding(self) -> bool:
        """When `True`, indicates columns should have alternating shading.

        Read/write. Used to allow columns to be traversed more easily without losing track of
        which column is being read.
        """
        return self._tbl.bandCol

    @vert_banding.setter
    def vert_banding(self, value: bool):
        self._tbl.bandCol = value


class _Cell(Subshape):
    """Table cell"""

    def __init__(self, tc: CT_TableCell, parent: ProvidesPart):
        super(_Cell, self).__init__(parent)
        self._tc = tc

    def __eq__(self, other: object) -> bool:
        """|True| if this object proxies the same element as `other`.

        Equality for proxy objects is defined as referring to the same XML element, whether or not
        they are the same proxy object instance.
        """
        if not isinstance(other, type(self)):
            return False
        return self._tc is other._tc

    def __ne__(self, other: object) -> bool:
        if not isinstance(other, type(self)):
            return True
        return self._tc is not other._tc

    @lazyproperty
    def fill(self) -> FillFormat:
        """|FillFormat| instance for this cell.

        Provides access to fill properties such as foreground color.
        """
        tcPr = self._tc.get_or_add_tcPr()
        return FillFormat.from_fill_parent(tcPr)

    @property
    def is_merge_origin(self) -> bool:
        """True if this cell is the top-left grid cell in a merged cell."""
        return self._tc.is_merge_origin

    @property
    def is_spanned(self) -> bool:
        """True if this cell is spanned by a merge-origin cell.

        A merge-origin cell "spans" the other grid cells in its merge range, consuming their area
        and "shadowing" the spanned grid cells.

        Note this value is |False| for a merge-origin cell. A merge-origin cell spans other grid
        cells, but is not itself a spanned cell.
        """
        return self._tc.is_spanned

    @property
    def margin_left(self) -> Length:
        """Left margin of cells.

        Read/write. If assigned |None|, the default value is used, 0.1 inches for left and right
        margins and 0.05 inches for top and bottom.
        """
        return self._tc.marL

    @margin_left.setter
    def margin_left(self, margin_left: Length | None):
        self._validate_margin_value(margin_left)
        self._tc.marL = margin_left

    @property
    def margin_right(self) -> Length:
        """Right margin of cell."""
        return self._tc.marR

    @margin_right.setter
    def margin_right(self, margin_right: Length | None):
        self._validate_margin_value(margin_right)
        self._tc.marR = margin_right

    @property
    def margin_top(self) -> Length:
        """Top margin of cell."""
        return self._tc.marT

    @margin_top.setter
    def margin_top(self, margin_top: Length | None):
        self._validate_margin_value(margin_top)
        self._tc.marT = margin_top

    @property
    def margin_bottom(self) -> Length:
        """Bottom margin of cell."""
        return self._tc.marB

    @margin_bottom.setter
    def margin_bottom(self, margin_bottom: Length | None):
        self._validate_margin_value(margin_bottom)
        self._tc.marB = margin_bottom

    def merge(self, other_cell: _Cell) -> None:
        """Create merged cell from this cell to `other_cell`.

        This cell and `other_cell` specify opposite corners of the merged cell range. Either
        diagonal of the cell region may be specified in either order, e.g. self=bottom-right,
        other_cell=top-left, etc.

        Raises |ValueError| if the specified range already contains merged cells anywhere within
        its extents or if `other_cell` is not in the same table as `self`.
        """
        tc_range = TcRange(self._tc, other_cell._tc)

        if not tc_range.in_same_table:
            raise ValueError("other_cell from different table")
        if tc_range.contains_merged_cell:
            raise ValueError("range contains one or more merged cells")

        tc_range.move_content_to_origin()

        row_count, col_count = tc_range.dimensions

        for tc in tc_range.iter_top_row_tcs():
            tc.rowSpan = row_count
        for tc in tc_range.iter_left_col_tcs():
            tc.gridSpan = col_count
        for tc in tc_range.iter_except_left_col_tcs():
            tc.hMerge = True
        for tc in tc_range.iter_except_top_row_tcs():
            tc.vMerge = True

    @property
    def span_height(self) -> int:
        """int count of rows spanned by this cell.

        The value of this property may be misleading (often 1) on cells where `.is_merge_origin`
        is not |True|, since only a merge-origin cell contains complete span information. This
        property is only intended for use on cells known to be a merge origin by testing
        `.is_merge_origin`.
        """
        return self._tc.rowSpan

    @property
    def span_width(self) -> int:
        """int count of columns spanned by this cell.

        The value of this property may be misleading (often 1) on cells where `.is_merge_origin`
        is not |True|, since only a merge-origin cell contains complete span information. This
        property is only intended for use on cells known to be a merge origin by testing
        `.is_merge_origin`.
        """
        return self._tc.gridSpan

    def split(self) -> None:
        """Remove merge from this (merge-origin) cell.

        The merged cell represented by this object will be "unmerged", yielding a separate
        unmerged cell for each grid cell previously spanned by this merge.

        Raises |ValueError| when this cell is not a merge-origin cell. Test with
        `.is_merge_origin` before calling.
        """
        if not self.is_merge_origin:
            raise ValueError("not a merge-origin cell; only a merge-origin cell can be sp" "lit")

        tc_range = TcRange.from_merge_origin(self._tc)

        for tc in tc_range.iter_tcs():
            tc.rowSpan = tc.gridSpan = 1
            tc.hMerge = tc.vMerge = False

    @property
    def text(self) -> str:
        """Textual content of cell as a single string.

        The returned string will contain a newline character (`"\\n"`) separating each paragraph
        and a vertical-tab (`"\\v"`) character for each line break (soft carriage return) in the
        cell's text.

        Assignment to `text` replaces all text currently contained in the cell. A newline
        character (`"\\n"`) in the assigned text causes a new paragraph to be started. A
        vertical-tab (`"\\v"`) character in the assigned text causes a line-break (soft
        carriage-return) to be inserted. (The vertical-tab character appears in clipboard text
        copied from PowerPoint as its encoding of line-breaks.)
        """
        return self.text_frame.text

    @text.setter
    def text(self, text: str):
        self.text_frame.text = text

    @property
    def text_frame(self) -> TextFrame:
        """|TextFrame| containing the text that appears in the cell."""
        txBody = self._tc.get_or_add_txBody()
        return TextFrame(txBody, self)

    @property
    def vertical_anchor(self) -> MSO_VERTICAL_ANCHOR | None:
        """Vertical alignment of this cell.

        This value is a member of the :ref:`MsoVerticalAnchor` enumeration or |None|. A value of
        |None| indicates the cell has no explicitly applied vertical anchor setting and its
        effective value is inherited from its style-hierarchy ancestors.

        Assigning |None| to this property causes any explicitly applied vertical anchor setting to
        be cleared and inheritance of its effective value to be restored.
        """
        return self._tc.anchor

    @vertical_anchor.setter
    def vertical_anchor(self, mso_anchor_idx: MSO_VERTICAL_ANCHOR | None):
        self._tc.anchor = mso_anchor_idx

    @staticmethod
    def _validate_margin_value(margin_value: Length | None) -> None:
        """Raise ValueError if `margin_value` is not a positive integer value or |None|."""
        if not isinstance(margin_value, int) and margin_value is not None:
            tmpl = "margin value must be integer or None, got '%s'"
            raise TypeError(tmpl % margin_value)


class _Column(Subshape):
    """Table column"""

    def __init__(self, gridCol: CT_TableCol, parent: _ColumnCollection):
        super(_Column, self).__init__(parent)
        self._parent = parent
        self._gridCol = gridCol

    @property
    def width(self) -> Length:
        """Width of column in EMU."""
        return self._gridCol.w

    @width.setter
    def width(self, width: Length):
        self._gridCol.w = width
        self._parent.notify_width_changed()


class _Row(Subshape):
    """Table row"""

    def __init__(self, tr: CT_TableRow, parent: _RowCollection):
        super(_Row, self).__init__(parent)
        self._parent = parent
        self._tr = tr

    @property
    def cells(self):
        """Read-only reference to collection of cells in row.

        An individual cell is referenced using list notation, e.g. `cell = row.cells[0]`.
        """
        return _CellCollection(self._tr, self)

    @property
    def height(self) -> Length:
        """Height of row in EMU."""
        return self._tr.h

    @height.setter
    def height(self, height: Length):
        self._tr.h = height
        self._parent.notify_height_changed()


class _CellCollection(Subshape):
    """Horizontal sequence of row cells"""

    def __init__(self, tr: CT_TableRow, parent: _Row):
        super(_CellCollection, self).__init__(parent)
        self._parent = parent
        self._tr = tr

    def __getitem__(self, idx: int) -> _Cell:
        """Provides indexed access, (e.g. 'cells[0]')."""
        if idx < 0 or idx >= len(self._tr.tc_lst):
            msg = "cell index [%d] out of range" % idx
            raise IndexError(msg)
        return _Cell(self._tr.tc_lst[idx], self)

    def __iter__(self) -> Iterator[_Cell]:
        """Provides iterability."""
        return (_Cell(tc, self) for tc in self._tr.tc_lst)

    def __len__(self) -> int:
        """Supports len() function (e.g. 'len(cells) == 1')."""
        return len(self._tr.tc_lst)


class _ColumnCollection(Subshape):
    """Sequence of table columns."""

    def __init__(self, tbl: CT_Table, parent: Table):
        super(_ColumnCollection, self).__init__(parent)
        self._parent = parent
        self._tbl = tbl

    def __getitem__(self, idx: int):
        """Provides indexed access, (e.g. 'columns[0]')."""
        if idx < 0 or idx >= len(self._tbl.tblGrid.gridCol_lst):
            msg = "column index [%d] out of range" % idx
            raise IndexError(msg)
        return _Column(self._tbl.tblGrid.gridCol_lst[idx], self)

    def __len__(self):
        """Supports len() function (e.g. 'len(columns) == 1')."""
        return len(self._tbl.tblGrid.gridCol_lst)

    def notify_width_changed(self):
        """Called by a column when its width changes. Pass along to parent."""
        self._parent.notify_width_changed()


class _RowCollection(Subshape):
    """Sequence of table rows"""

    def __init__(self, tbl: CT_Table, parent: Table):
        super(_RowCollection, self).__init__(parent)
        self._parent = parent
        self._tbl = tbl

    def __getitem__(self, idx: int) -> _Row:
        """Provides indexed access, (e.g. 'rows[0]')."""
        if idx < 0 or idx >= len(self):
            msg = "row index [%d] out of range" % idx
            raise IndexError(msg)
        return _Row(self._tbl.tr_lst[idx], self)

    def __len__(self):
        """Supports len() function (e.g. 'len(rows) == 1')."""
        return len(self._tbl.tr_lst)

    def notify_height_changed(self):
        """Called by a row when its height changes. Pass along to parent."""
        self._parent.notify_height_changed()