##############################################################################
# ScoDoc
# Copyright (c) 1999 - 2023 Emmanuel Viennet.  All rights reserved.
# See LICENSE
##############################################################################

"""Classes pour aider à construire des tables de résultats
"""
from collections import defaultdict

from openpyxl import Workbook
from openpyxl.utils import get_column_letter

from app.scodoc import sco_excel


class Element:
    "Element de base pour les tables"

    def __init__(
        self,
        elt: str,
        content=None,
        classes: list[str] = None,
        attrs: dict[str, str] = None,
        data: dict = None,
    ):
        self.elt = elt
        self.attrs = attrs or {}
        self.classes = classes or []
        "list of classes for the element"
        self.content = content
        self.data = data or {}
        "data-xxx"

    def html(self, extra_classes: set[str] = None) -> str:
        "html for element"
        classes = [cls for cls in (self.classes + (list(extra_classes or []))) if cls]
        attrs_str = f"""class="{' '.join(classes)}" """ if classes else ""
        # Autres attributs:
        attrs_str += " " + " ".join([f'{k}="{v}"' for (k, v) in self.attrs.items()])
        # et data-x
        attrs_str += " " + " ".join([f'data-{k}="{v}"' for k, v in self.data.items()])
        return f"""<{self.elt} {attrs_str}>{self.html_content()}</{self.elt}>"""

    def html_content(self) -> str:
        "Le contenu de l'élément, en html."
        return str(self.content or "")

    def add_class(self, klass: str):
        "Add a class, do nothing if already there"
        if klass not in self.classes:
            self.classes.append(klass)


class Table(Element):
    """Construction d'une table de résultats

    Ordre des colonnes: groupées par groupes, et dans chaque groupe par ordre d'insertion
    On fixe l'ordre des groupes par ordre d'insertion
       ou par insert_group ou par set_column_groups.

    """

    def __init__(
        self,
        selected_row_id: str = None,
        classes: list[str] = None,
        attrs: dict[str, str] = None,
        data: dict = None,
        with_foot_titles=True,
        row_class=None,
        xls_sheet_name="feuille",
        xls_before_table=[],  # liste de cellules a placer avant la table
        xls_style_base=None,  # style excel pour les cellules
        xls_columns_width=None,  # { col_id : largeur en "pixels excel" }
        caption="",
        origin="",
    ):
        super().__init__("table", classes=classes, attrs=attrs, data=data)
        self.row_class = row_class or Row
        self.rows: list["Row"] = []
        "ordered list of Rows"
        self.row_by_id: dict[str, "Row"] = {}
        self.column_ids = []
        "ordered list of columns ids"
        self.raw_column_ids = []
        "ordered list of columns ids for excel"
        self.groups = []
        "ordered list of column groups names"
        self.group_titles = {}
        "title (in header top row) for the group"
        self.head = []
        self.foot = []
        self.column_group = {}
        "the group of the column: { col_id : group }"
        self.column_classes: defaultdict[str, set[str]] = defaultdict(set)
        "classe ajoutée à toutes les cellules de la colonne: { col_id : class }"
        self.selected_row_id = selected_row_id
        "l'id de la ligne sélectionnée"
        self.titles = {}
        "Column title: { col_id : titre }"
        self.head_title_row: "Row" = Row(
            self, "title_head", cell_elt="th", classes=["titles"]
        )
        self.foot_title_row: "Row" = (
            Row(self, "title_foot", cell_elt="th", classes=["titles"])
            if with_foot_titles
            else None
        )
        self.empty_cell = Cell.empty()
        # Excel (xls) spécifique:
        self.xls_before_table = xls_before_table
        self.xls_columns_width = xls_columns_width or {}
        self.xls_sheet_name = xls_sheet_name
        self.xls_style_base = xls_style_base
        #
        self.caption = caption
        self.origin = origin

    def _prepare(self):
        """Prepare the table before generation:
        Sort table columns, add header/footer titles rows
        """
        self.sort_columns()
        # Titres
        if self.head_title_row:
            self.add_head_row(self.head_title_row)
        if self.foot_title_row:
            self.add_foot_row(self.foot_title_row)

    def get_row_by_id(self, row_id) -> "Row":
        "return the row, or None"
        return self.row_by_id.get(row_id)

    def __len__(self):
        "nombre de lignes dans le corps de la table"
        return len(self.rows)

    def is_empty(self) -> bool:
        "true if table has no rows"
        return len(self.rows) == 0

    def select_row(self, row_id):
        "mark rows as 'selected'"
        self.selected_row_id = row_id

    def to_list(self) -> list[dict]:
        """as a list, each row is a dict (sans les lignes d'en-tête ni de pied de table)"""
        self._prepare()
        return [row.to_dict() for row in self.rows]

    def html(self, extra_classes: list[str] = None) -> str:
        """HTML version of the table"""
        self._prepare()
        return super().html(extra_classes=extra_classes)

    def html_content(self) -> str:
        """Le contenu de la table en html."""
        newline = "\n"
        header = (
            f"""
        <thead>
            { newline.join(row.html() for row in self.head) }
        </thead>
        """
            if self.head
            else ""
        )
        footer = (
            f"""
        <tfoot>
            { newline.join(row.html() for row in self.foot) }
        </tfoot>
        """
            if self.foot
            else ""
        )
        return f"""
        {header}
        <tbody>
        {
            newline.join(row.html() for row in self.rows)
        }
        </tbody>
        {footer}
        """

    def add_row(self, row: "Row") -> "Row":
        """Append a new row"""
        self.rows.append(row)
        self.row_by_id[row.id] = row
        return row

    def add_head_row(self, row: "Row") -> "Row":
        "Add a row to table head"
        self.head.append(row)
        self.row_by_id[row.id] = row
        return row

    def add_foot_row(self, row: "Row") -> "Row":
        "Add a row to table foot"
        self.foot.append(row)
        self.row_by_id[row.id] = row
        return row

    def add_groups_header(self):
        """Insert a header line at the top of the table
        with a multicolumn th cell per group
        """
        self.sort_columns()
        groups_header = RowGroupsHeader(
            self, "groups_header", classes=["groups_header"]
        )
        self.head.insert(0, groups_header)

    def sort_rows(self, key: callable, reverse: bool = False):
        """Sort table rows"""
        self.rows.sort(key=key, reverse=reverse)

    def sort_columns(self):
        """Sort columns ids"""
        groups_order = {group: i for i, group in enumerate(self.groups)}
        cols_order = {col_id: i for i, col_id in enumerate(self.column_ids)}
        self.column_ids.sort(
            key=lambda col_id: (
                groups_order.get(self.column_group.get(col_id), col_id),
                cols_order[col_id],
            )
        )

    def insert_group(self, group: str, after: str = None, before: str = None):
        """Déclare un groupe de colonnes et le place avant ou après un autre groupe.
        Si pas d'autre groupe indiqué, le place après, à droite du dernier.
        Si le group existe déjà, ne fait rien (ne le déplace pas).
        """
        if group in self.groups:
            return
        other = after or before
        if other is None:
            self.groups.append(group)
        else:
            if not other in self.groups:
                raise ValueError(f"invalid column group '{other}'")
            index = self.groups.index(other)
            if after:
                index += 1
            self.groups.insert(index, group)

    def set_groups(self, groups: list[str]):
        """Define column groups and set order"""
        self.groups = groups

    def set_titles(self, titles: dict[str, str]):
        """Set columns titles"""
        self.titles = titles

    def update_titles(self, titles: dict[str, str]):
        """Set columns titles"""
        self.titles.update(titles)

    def add_title(
        self, col_id, title: str = None, classes: list[str] = None
    ) -> tuple["Cell", "Cell"]:
        """Record this title,
        and create cells for footer and header if they don't already exist.
        """
        title = title or ""
        if col_id not in self.titles:
            self.titles[col_id] = title
            if self.head_title_row:
                self.head_title_row.cells[col_id] = self.head_title_row.add_cell(
                    col_id,
                    None,
                    title,
                    classes=classes,
                    group=self.column_group.get(col_id),
                )
            if self.foot_title_row:
                self.foot_title_row.cells[col_id] = self.foot_title_row.add_cell(
                    col_id, None, title, classes=classes
                )
        head_cell = (
            self.head_title_row.cells.get(col_id) if self.head_title_row else None
        )
        foot_cell = self.foot_title_row.cells[col_id] if self.foot_title_row else None
        return head_cell, foot_cell

    def excel(self, wb: Workbook = None):
        """Simple Excel representation of the table."""
        self._prepare()
        if wb is None:
            sheet = sco_excel.ScoExcelSheet(sheet_name=self.xls_sheet_name, wb=wb)
        else:
            sheet = wb.create_sheet(sheet_name=self.xls_sheet_name)
        sheet.rows += self.xls_before_table
        style_bold = sco_excel.excel_make_style(bold=True)
        style_base = self.xls_style_base or sco_excel.excel_make_style()

        for row in self.head:
            sheet.append_row(row.to_excel(sheet, style=style_bold))

        for row in self.rows:
            sheet.append_row(row.to_excel(sheet, style=style_base))

        for row in self.foot:
            sheet.append_row(row.to_excel(sheet, style=style_base))

        if self.caption:
            sheet.append_blank_row()  # empty line
            sheet.append_single_cell_row(self.caption, style_base)
        if self.origin:
            sheet.append_blank_row()  # empty line
            sheet.append_single_cell_row(self.origin, style_base)

        # Largeurs des colonnes
        for col_id, width in self.xls_columns_width.items():
            try:
                idx = self.column_ids.index(col_id)
                col = get_column_letter(idx + 1)
                sheet.set_column_dimension_width(col, width)
            except ValueError:
                pass

        if wb is None:
            return sheet.generate()


class Row(Element):
    """A row."""

    def __init__(
        self,
        table: Table,
        row_id=None,
        category=None,
        cell_elt: str = None,
        classes: list[str] = None,
        attrs: dict[str, str] = None,
        data: dict = None,
    ):
        super().__init__("tr", classes=classes, attrs=attrs, data=data)
        self.category = category
        self.cells = {}
        self.cell_elt = cell_elt
        self.classes: list[str] = classes or []
        "classes sur le <tr>"
        self.id = row_id
        self.table = table

    def add_cell(
        self,
        col_id: str,
        title: str,
        content: str,
        group: str = None,
        attrs: list[str] = None,
        classes: list[str] = None,
        data: dict[str, str] = None,
        elt: str = None,
        raw_content=None,
        target_attrs: dict = None,
        target: str = None,
        column_classes: set[str] = None,
        no_excel: bool = False,
    ) -> "Cell":
        """Create cell and add it to the row.
        group: groupe de colonnes
        classes is a list of css class names
        """
        classes = classes.copy() if classes else []
        if group:
            self.table.column_classes[col_id].add(group)
        if column_classes:
            self.table.column_classes[col_id].update(column_classes)
        cell = Cell(
            content,
            classes,
            elt=elt or self.cell_elt,
            attrs=attrs,
            data=data,
            raw_content=raw_content,
            target=target,
            target_attrs=target_attrs,
        )
        return self.add_cell_instance(
            col_id, cell, column_group=group, title=title, no_excel=no_excel
        )

    def add_cell_instance(
        self,
        col_id: str,
        cell: "Cell",
        column_group: str = None,
        title: str = None,
        no_excel: bool = False,
    ) -> "Cell":
        """Add a cell to the row.
        Si title est None, il doit avoir été ajouté avec table.add_title().
        """
        cell.data["group"] = column_group or ""
        self.cells[col_id] = cell
        if col_id not in self.table.column_ids:
            self.table.column_ids.append(col_id)
            if not no_excel:
                self.table.raw_column_ids.append(col_id)

        self.table.insert_group(column_group)
        if column_group is not None:
            self.table.column_group[col_id] = column_group

        if title is not None:
            self.table.add_title(col_id, title, classes=cell.classes)

        return cell

    def html(self, extra_classes: list[str] = None) -> str:
        """html for row, with cells"""
        if (self.id is not None) and self.id == getattr(self.table, "selected_row_id"):
            self.classes.append("row_selected")
        return super().html(extra_classes=extra_classes)

    def html_content(self) -> str:
        "Le contenu du row en html."
        return "".join(
            [
                self.cells.get(col_id, self.table.empty_cell).html(
                    extra_classes=self.table.column_classes.get(col_id)
                )
                for col_id in self.table.column_ids
            ]
        )

    def to_dict(self) -> dict:
        """row as a dict, with only cell contents"""
        return {
            col_id: self.cells.get(col_id, self.table.empty_cell).raw_content
            for col_id in self.table.raw_column_ids
        }

    def to_excel(self, sheet, style=None) -> list:
        "build excel row for given sheet"
        return sheet.make_row(self.to_dict().values(), style=style)


class BottomRow(Row):
    """Une ligne spéciale pour le pied de table
    avec un titre à gauche
    (répété sur les colonnes indiquées par left_title_col_ids),
    et automatiquement ajouté au footer.
    """

    def __init__(
        self, *args, left_title_col_ids: list[str] = None, left_title=None, **kwargs
    ):
        super().__init__(*args, **kwargs)
        self.left_title_col_ids = left_title_col_ids
        if left_title is not None:
            self.set_left_title(left_title)
        self.table.add_foot_row(self)

    def set_left_title(self, title: str = ""):
        "Fill left title cells"
        for col_id in self.left_title_col_ids:
            self.add_cell(col_id, None, title)


class Cell(Element):
    """Une cellule de table"""

    def __init__(
        self,
        content,
        classes: list[str] = None,
        elt="td",
        attrs: dict[str, str] = None,
        data: dict = None,
        raw_content=None,
        target: str = None,
        target_attrs: dict = None,
    ):
        """if specified, raw_content will be used for raw exports like xlsx"""
        super().__init__(
            elt if elt is not None else "td", content, classes, attrs, data
        )
        if self.elt == "th":
            self.attrs["scope"] = "row"

        self.data = data.copy() if data else {}
        self.raw_content = raw_content or content
        self.target = target
        self.target_attrs = target_attrs or {}

    @classmethod
    def empty(cls):
        "create a new empty cell"
        return cls("")

    def __str__(self):
        return str(self.content)

    def html_content(self) -> str:
        "content of the table cell, as html"
        # entoure le contenu par un lien ?
        if (self.target is not None) or self.target_attrs:
            href = f'href="{self.target}"' if self.target else ""
            target_attrs_str = " ".join(
                [f'{k}="{v}"' for (k, v) in self.target_attrs.items()]
            )
            return f"<a {href} {target_attrs_str}>{super().html_content()}</a>"

        return super().html_content()


class RowGroupsHeader(Row):
    """Header line at the top of the table
    with a multicolumn th cell per group
    """

    def html_content(self):
        """Le contenu est généré intégralement ici: un th par groupe contigu
        Note: les colonnes doivent avoir déjà été triées par table.sort_columns()
        """
        column_ids = self.table.column_ids
        nb_cols = len(self.table.column_ids)
        elements = []
        idx = 0
        while idx < nb_cols:
            group_title = self.table.group_titles.get(
                self.table.column_group.get(column_ids[idx])
            )
            colspan = 1
            idx += 1
            # on groupe tant que les TITRES des groupes sont identiques
            while idx < nb_cols and group_title == self.table.group_titles.get(
                self.table.column_group.get(column_ids[idx])
            ):
                idx += 1
                colspan += 1
            elements.append(f"""<th colspan="{colspan}">{group_title or ""}</th>""")

        return "\n".join(elements) if len(elements) > 1 else ""