"""
The MIT License (MIT)

Copyright © 2015-2016 Franklin "Snaipe" Mathieu <http://snai.pe/>

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
"""


from textwrap import wrap

from docutils import nodes

from .unicode import u


class CellDimCalculator(nodes.NodeVisitor):
    def __init__(self, document, cols, rows, width):
        nodes.NodeVisitor.__init__(self, document)
        self.cols = cols
        self.rows = rows
        self.width = width
        self.height = 0

    def visit_paragraph(self, node):
        first_line = node.astext().split("\n")[0]

        # handle weird table sizing from simple rst tables
        # disregard cells spanning multiple columns, as
        # these don't contribute to the cell width calculation
        if len(first_line) >= self.width:
            self.width = len(first_line) + 2

        sublines = wrap(node.astext(), width=self.width)
        self.height = int(len(sublines) / self.rows)
        raise nodes.StopTraversal

    def visit_table(self, node):
        c = TableSizeCalculator(self.document)
        node.walkabout(c)
        self.height = int(c.height / self.rows)
        raise nodes.StopTraversal

    def visit_literal_block(self, node):
        self.height = int(len(node.astext().split("\n")) / self.rows)
        raise nodes.StopTraversal

    visit_Text = visit_literal_block

    def __getattr__(self, name):
        if name.startswith("visit_") or name.startswith("depart_"):

            def noop(*args, **kwargs):
                pass

            return noop
        raise AttributeError(name)


class TableSizeCalculator(nodes.NodeVisitor):
    def __init__(self, document):
        nodes.NodeVisitor.__init__(self, document)
        self.level = 0
        self.widths = []
        self.heights = []
        self.rows = 0

    def __getattr__(self, name):
        if name.startswith("visit_") or name.startswith("depart_"):

            def noop(*args, **kwargs):
                pass

            return noop
        raise AttributeError(name)

    def visit_table(self, node):
        if self.level > 0:
            raise nodes.SkipChildren
        self.level += 1

    def depart_table(self, node):
        self.width = sum(self.widths) + (len(self.widths) + 1)
        self.height = sum(self.heights) + (len(self.heights) + 1)
        self.level -= 1

    def visit_tgroup(self, node):
        self.cols = node.attributes["cols"]

    def visit_colspec(self, node):
        self.widths.append(node.attributes["colwidth"])

    def visit_row(self, node):
        self.rows += 1
        self.heights.append(1)
        self.col = 0

    def visit_entry(self, node):
        cols = node.attributes.get("morecols", 0) + 1
        rows = node.attributes.get("morerows", 0) + 1
        width = sum(self.widths[self.col : self.col + cols]) + (cols - 1)

        c = CellDimCalculator(self.document, cols, rows, width)
        node.walkabout(c)

        # Correct invalid column sizing for simple rst tables
        if c.width > width and cols == 1:
            self.widths[self.col] = c.width

        self.heights[-1] = max(self.heights[-1], c.height)
        self.col += 1
        raise nodes.SkipChildren


class TableDrawer(nodes.NodeVisitor):
    def __init__(self, props, document, **options):
        nodes.NodeVisitor.__init__(self, document)
        self.props = props
        self.level = 0
        self.lines = [""]
        self.line = 0
        self.cursor = 0
        self.col = 0
        self.row = 0
        self.nb_rows = 0
        self.options = options

        def unicode_intersection(char, next):
            switch = {
                ("─", "│"): "┬",
                ("┐", "│"): "┐",
                ("┘", "│"): "┤",
                ("┘", "─"): "┴",
                ("┴", "│"): "┼",
                ("│", "─"): "├",
                ("┤", "─"): "┼",
                (" ", "─"): "┘",
                ("└", "─"): "└",
                ("═", "│"): "╤",
                ("╕", "│"): "╕",
                ("╛", "│"): "╡",
                ("╛", "═"): "╧",
                ("╧", "│"): "╪",
                ("│", "═"): "╞",
                ("╡", "═"): "╪",
                (" ", "═"): "╛",
                ("╘", "═"): "╘",
            }
            return switch[(u(char), u(next))]

        if options.get("unicode", False):
            self.char_single_rule = "─"
            self.char_double_rule = "═"
            self.char_vertical_rule = "│"
            self.get_intersection = unicode_intersection
            self.top_left = "┌"
            self.top_right = "┐"
            self.bottom_left = "╘"
        else:
            self.char_single_rule = "-"
            self.char_double_rule = "="
            self.char_vertical_rule = "|"
            self.get_intersection = lambda *args: "+"
            self.top_left = self.bottom_left = self.top_right = "+"

    def __getattr__(self, name):
        if name.startswith("visit_") or name.startswith("depart_"):

            def noop(*args, **kwargs):
                pass

            return noop
        if name == "curline":
            return self.lines[self.line]
        raise AttributeError(name)

    def _draw_rule(self):
        self.lines[self.line] += (
            self.top_left
            + self.char_single_rule * (self.props.width - 2)
            + self.top_right
        )
        self.lines.extend(
            [self.char_vertical_rule + " " * (self.props.width - 1)]
            * (self.props.height - 2)
        )
        self.lines.extend([self.bottom_left + " " * (self.props.width - 1)])
        self.line += 1
        self.cursor = 0

    def visit_table(self, node):
        if self.level > 0:
            raise nodes.SkipChildren
        self.level += 1
        self._draw_rule()

    def depart_table(self, node):
        self.level -= 1

    def visit_row(self, node):
        self.col = 0
        self.cursor = 0

    def depart_row(self, node):
        self.line += self.props.heights[self.row] + 1
        self.row += 1
        self.local_row += 1

    def visit_thead(self, node):
        self.nb_rows = len(node.children)
        self.local_row = 0

    visit_tbody = visit_thead

    def visit_entry(self, node):
        cols = node.attributes.get("morecols", 0) + 1
        rows = node.attributes.get("morerows", 0) + 1

        width = sum(self.props.widths[self.col : self.col + cols]) + (cols - 1)
        height = sum(self.props.heights[self.row : self.row + rows]) + (rows - 1)

        rule = (
            self.char_double_rule
            if self.local_row + rows - 1 == self.nb_rows - 1
            else self.char_single_rule
        )
        sep = self.char_vertical_rule

        # Draw the horizontal rule

        line = self.lines[self.line + height]
        int1 = self.get_intersection(line[self.cursor], rule)
        int2 = self.get_intersection(line[self.cursor + width + 1], rule)
        line = (
            line[: self.cursor]
            + int1
            + (width * rule)
            + int2
            + line[self.cursor + width + 2 :]
        )
        self.lines[self.line + height] = line

        # Draw the vertical rule

        for i in range(height):
            line = self.lines[self.line + i]
            line = (
                line[: self.cursor + width + 1] + sep + line[self.cursor + width + 2 :]
            )
            self.lines[self.line + i] = line

        line = self.lines[self.line - 1]
        int3 = self.get_intersection(line[self.cursor + width + 1], sep)
        line = line[: self.cursor + width + 1] + int3 + line[self.cursor + width + 2 :]
        self.lines[self.line - 1] = line

        self.col += cols
        self.cursor += width + 1

        # Do not recurse
        raise nodes.SkipChildren


class TableWriter(nodes.NodeVisitor):
    def __init__(self, props, document, **options):
        nodes.NodeVisitor.__init__(self, document)
        self.props = props
        self.level = 0
        self.line = 0
        self.cursor = 0
        self.col = 0
        self.row = 0
        self.nb_rows = 0
        self.options = options

    def __getattr__(self, name):
        if name.startswith("visit_") or name.startswith("depart_"):

            def noop(*args, **kwargs):
                pass

            return noop
        raise AttributeError(name)

    def visit_table(self, node):
        drawer = TableDrawer(self.props, self.document, **self.options)
        node.walkabout(drawer)
        self.lines = drawer.lines

    def visit_row(self, node):
        self.col = 0
        self.cursor = 0

    def depart_row(self, node):
        self.line += self.props.heights[self.row] + 1
        self.row += 1
        self.local_row += 1

    def visit_thead(self, node):
        self.nb_rows = len(node.children)
        self.local_row = 0

    visit_tbody = visit_thead

    def visit_entry(self, node):
        cols = node.attributes.get("morecols", 0) + 1
        rows = node.attributes.get("morerows", 0) + 1

        width = sum(self.props.widths[self.col : self.col + cols]) + (cols - 1)
        height = sum(self.props.heights[self.row : self.row + rows]) + (rows - 1)

        from .ansi import ANSITranslator

        if node.children:
            v = ANSITranslator(
                self.document, termsize=(width - 2, height), **self.options
            )
            node.children[0].walkabout(v)
            v.strip_empty_lines()
            i = 1
            for l in v.lines:
                for sl in l.split("\n"):
                    line = self.lines[self.line + i]
                    line = (
                        line[: self.cursor + 2] + sl + line[self.cursor + 2 + len(sl) :]
                    )
                    self.lines[self.line + i] = line
                    i += 1

        self.col += cols
        self.cursor += width + 1

        # Do not recurse
        raise nodes.SkipChildren
