import kutil
import klammer_base
import phases

NUMBER_VAR = "___NUM___"

class Section(klammer_base.Klammer_base):
    label_number = 0
    count = 7
    indices = [0] * count
    def __init__(self, K, level, numbered=True):
        super().__init__(K)
        # Add front and back matter elements as special cases:
        if level == "preface":
            self.preface = True
            self.level = 0
            self.title = None
        else:
            self.preface = False
            self.level = level
        self.numbered = numbered
        self.part = 1

    def html(self):
        tags = "kt-part kt-chapter h1 h2 h3 h4 h5 h6 h7".split()
        display_names = "Part Chapter".split()
        id = f' id="{self.id}"' if self.id else ""
        # number_class = " numbered" if self.numbered else ""
        number_class = "" # The variable is sufficient?
        title = self.title
        tag = tags[self.level]
        if self.numbered:
            """
            Section.indices[self.level] += 1
            for i in range(self.level + 1, Section.count):
                Section.indices[i] = 0
            level_number = ".".join([str(e) for e in Section.indices])
            title = f'<span class="sectionnumber">{level_number}</span> {title}'
            """
            title = f'<span class="sectionnumber">{NUMBER_VAR}</span> {self.title if self.title else ""}'
        if self.level < 1:  # < 2 for "Chapter"
            #title = f"{tag} {Section.indices[self.level]} {title}"
            title = f"{display_names[self.level]} {title if title else ''}"

        result = f'<{tag}{id}{number_class}>{title}</{tag}>\n\n'
        return result

    def tex(self):
        # names = "part chapter section subsection subsubsection paragraph subparagraph subsubparagraph subsubsubparagraph".split()
        names = "part sA sB sC sD sE".split()

        # The \hypertarget name.  K_document_file is the chapter's basename,
        # set by @document (document_latex.cpp): with it the name is stable
        # across the page cache, where a counter alone collided when some
        # chapters were served from cache and others reprocessed.
        basename = getattr(self, "K_document_file", "") or ""
        if self.id:
            id = self.id
        else:
            id = f"{basename}-s{Section.label_number}"
            Section.label_number += 1

        result = ''
        if getattr(self, "n", -1) > -1:   # absent for @part and @h1..@h7
            result += f'\\setcounter{{chapter}}{{{int(self.n)-1}}}\n'
        suffix = "" if self.numbered else "*"
        result += f'\\{names[self.level]}{suffix}{{{self.title}}}'
        result += f'\n\\hypertarget{{{id}}}{{}}'

        # result = kutil.protect_klammertext_special_characters(result)

        # The announcement @document's section-link resolver reads (fields
        # separated by KTSL; see sks/document/section_link.h).  Title last:
        # it may hold anything.
        result = f"%__sectionlink__{id}__KTSL__{basename}__KTSL__{self.title}__" + "\n" + result
        return result

    def txt(self):
        # The number is a marker phases.txt_insert_section_numbers resolves
        # -- to a number inside a @document, to nothing outside one -- so
        # the space after it is the marker's, not the title's.  A preface
        # and an unnumbered heading carry no marker at all; a part carries
        # a level-0 marker and its name, as the html "Part" prefix.
        if self.preface:
            return f"@b {self.name} @"
        if not self.numbered:
            return f"@b {self.title} @"
        # :n comes from section_args, which @part and the @h headings do
        # not declare, so it is absent there rather than -1.
        marker = phases.txt_section_marker(self.level, getattr(self, "n", -1))
        if self.level == 0:
            return f"@b {marker} {self.name} {self.title} @"
        return f"@b {marker} {self.title} @"