#!/bin/env python
#Copyright ReportLab Europe Ltd. 2000-2017
#see license.txt for license details
#history https://hg.reportlab.com/hg-public/reportlab/log/tip/tools/docco/rl_doc_utils.py
__version__='3.3.0'

__doc__ = """
This module contains utilities for generating guides
"""

import os
from reportlab.lib.utils import asUnicode

from .stylesheet import getStyleSheet
styleSheet = getStyleSheet()

#from reportlab.platypus.doctemplate import SimpleDocTemplate
from reportlab.lib.units import inch
from reportlab.platypus import figures
from reportlab.platypus import Paragraph, Spacer, Preformatted,\
            PageBreak, CondPageBreak, Table, TableStyle,\
            NextPageTemplate, KeepTogether, Image, XPreformatted
from reportlab.platypus.xpreformatted import PythonPreformatted
from reportlab.lib.styles import ParagraphStyle
from reportlab.lib import colors
from reportlab.lib.sequencer import getSequencer
from xml.sax.saxutils import escape as xmlEscape

from . import examples

appmode=0

from .t_parse import Template
QFcodetemplate = Template("X$X$", "X")
QFreptemplate = Template("X^X^", "X")
codesubst = "%s<font name=Courier><nobr>%s</nobr></font>"
QFsubst = "%s<font name=Courier><i><nobr>%s</nobr></i></font>"

def quickfix(text):
    """inside text find any subsequence of form $subsequence$.
       Format the subsequence as code.  If similarly if text contains ^arg^
       format the arg as replaceable.  The escape sequence for literal
       $ is $\\$ (^ is ^\\^.
    """
    for (template,subst) in [(QFcodetemplate, codesubst), (QFreptemplate, QFsubst)]:
        fragment = text
        parts = []
        try:
            while fragment:
                try:
                    (matches, index) = template.PARSE(fragment)
                except: raise ValueError
                else:
                    [prefix, code] = matches
                    if code == "\\":
                        part = fragment[:index]
                    else:
                        part = subst % (prefix, code)
                    parts.append(part)
                    fragment = fragment[index:]
        except ValueError:
            parts.append(fragment)
        text = ''.join(parts)
    return text
#print quickfix("$testing$ testing $one$ ^two^ $three(^four^)$")

H1 = styleSheet['Heading1']
H2 = styleSheet['Heading2']
H3 = styleSheet['Heading3']
H4 = styleSheet['Heading4']
B = styleSheet['BodyText']
BU = styleSheet['Bullet']
Comment = styleSheet['Comment']
Centred = styleSheet['Centred']
Caption = styleSheet['Caption']

#set up numbering
seq = getSequencer()
seq.setFormat('Chapter','1')
seq.setFormat('Section','1')
seq.setFormat('Appendix','A')
seq.setFormat('Figure', '1')
seq.chain('Chapter','Section')
seq.chain('Chapter','Figure')

lessonnamestyle = H2
discussiontextstyle = B
exampletextstyle = styleSheet['Code']
# size for every example
examplefunctionxinches = 5.5
examplefunctionyinches = 3
examplefunctiondisplaysizes = (examplefunctionxinches*inch, examplefunctionyinches*inch)

def getJustFontPaths():
    '''return afm and pfb for Just's files'''
    import reportlab
    folder = os.path.dirname(reportlab.__file__) + os.sep + 'fonts'
    return os.path.join(folder, 'DarkGardenMK.afm'), os.path.join(folder, 'DarkGardenMK.pfb')

# for testing
def NOP(*x,**y):
    return None

def CPage(inches):
    getStory().append(CondPageBreak(inches*inch))

def newPage():
    getStory().append(PageBreak())

def nextTemplate(templName):
    f = NextPageTemplate(templName)
    getStory().append(f)

def disc(text, klass=Paragraph, style=discussiontextstyle):
    text = quickfix(text)
    P = klass(text, style)
    getStory().append(P)

def restartList():
    getSequencer().reset('list1')

def list1(text, doBullet=1):
    text=quickfix(text)
    if doBullet:
        text='<bullet><seq id="list1"/>.</bullet>'+text
    P = Paragraph(text, BU)
    getStory().append(P)

def bullet(text):
    text=u'<bullet><font name="Symbol">\u2022</font></bullet>' + asUnicode(quickfix(text))
    P = Paragraph(text, BU)
    getStory().append(P)

def eg(text,before=0.1,after=0,klass=PythonPreformatted):
    space(before)
    disc(text, klass=klass, style=exampletextstyle)
    space(after)

def npeg(text,before=0.1,after=0):
    eg(text,before=before,after=after,klass=XPreformatted)

def space(inches=1./6):
    if inches: getStory().append(Spacer(0,inches*inch))

def EmbeddedCode(code,name='t'):
    eg(code)
    disc("produces")
    exec(code+("\ngetStory().append(%s)\n"%name))

def startKeep():
    return len(getStory())

def endKeep(s):
    S = getStory()
    k = KeepTogether(S[s:])
    S[s:] = [k]

def title(text):
    """Use this for the document title only"""
    disc(text,style=styleSheet['Title'])

#AR 3/7/2000 - defining three new levels of headings; code
#should be swapped over to using them.

def headingTOC(text='Table of contents'):
    getStory().append(PageBreak())
    p = Paragraph(text, H1)
    getStory().append(p)

def heading1(text):
    """Use this for chapters.  Lessons within a big chapter
    should now use heading2 instead.  Chapters get numbered."""
    getStory().append(PageBreak())
    p = Paragraph('Chapter <seq id="Chapter"/> ' + quickfix(text), H1)
    getStory().append(p)

def Appendix1(text,):
    global appmode
    getStory().append(PageBreak())
    if not appmode:
        seq.setFormat('Chapter','A')
        seq.reset('Chapter')
        appmode = 1
    p = Paragraph('Appendix <seq id="Chapter"/> ' + quickfix(text), H1)
    getStory().append(p)

def heading2(text):
    """Used to be 'lesson'"""
    getStory().append(CondPageBreak(inch))
    p = Paragraph('<seq template="%(Chapter)s.%(Section+)s "/>' + quickfix(text), H2)
    getStory().append(p)

def heading3(text):
    """Used to be most of the plain old 'head' sections"""
    getStory().append(CondPageBreak(inch))
    p = Paragraph(quickfix(text), H3)
    getStory().append(p)

def image(path, width=None, height=None ):
    s = startKeep()
    space(.2)
    import reportlab
    rlDocImageDir = os.path.join(os.path.dirname(reportlab.__file__), 'docs','images')
    getStory().append(Image(os.path.join(rlDocImageDir,path),width,height))
    space(.2)
    endKeep(s)

def heading4(text):
    """Used to be most of the plain old 'head' sections"""
    getStory().append(CondPageBreak(inch))
    p = Paragraph(quickfix(text), H4)
    getStory().append(p)

def todo(text):
    """Used for notes to ourselves"""
    getStory().append(Paragraph(quickfix(text), Comment))

def centred(text):
    getStory().append(Paragraph(quickfix(text), Centred))

def caption(text):
    getStory().append(Paragraph(quickfix(text), Caption))

class Illustration(figures.Figure):
    """The examples are all presented as functions which do
    something to a canvas, with a constant height and width
    used.  This puts them inside a figure box with a caption."""

    def __init__(self, operation, caption, width=None, height=None):
        stdwidth, stdheight = examplefunctiondisplaysizes
        if not width:
            width = stdwidth
        if not height:
            height = stdheight
        #figures.Figure.__init__(self, stdwidth * 0.75, stdheight * 0.75)
        figures.Figure.__init__(self, width, height,
                    'Figure <seq template="%(Chapter)s-%(Figure+)s"/>: ' + quickfix(caption))
        self.operation = operation

    def drawFigure(self):
        #shrink it a little...
        #self.canv.scale(0.75, 0.75)
        self.operation(self.canv)


def illust(operation, caption, width=None, height=None):
    i = Illustration(operation, caption, width=width, height=height)
    getStory().append(i)


class GraphicsDrawing(Illustration):
    """Lets you include reportlab/graphics drawings seamlessly,
    with the right numbering."""
    def __init__(self, drawing, caption):
        figures.Figure.__init__(self,
                                  drawing.width,
                                  drawing.height,
                    'Figure <seq template="%(Chapter)s-%(Figure+)s"/>: ' + quickfix(caption)
                                  )
        self.drawing = drawing

    def drawFigure(self):
        d = self.drawing
        d.wrap(d.width, d.height)
        d.drawOn(self.canv, 0, 0)

def draw(drawing, caption):
    d = GraphicsDrawing(drawing, caption)
    getStory().append(d)

class ParaBox(figures.Figure):
    """Illustrates paragraph examples, with style attributes on the left"""
    descrStyle = ParagraphStyle('description',
                                fontName='Courier',
                                fontSize=8,
                                leading=9.6)

    def __init__(self, text, style, caption):
        figures.Figure.__init__(self, 0, 0, caption)
        self.text = text
        self.style = style
        self.para = Paragraph(text, style)

        styleText = self.getStyleText(style)
        self.pre = Preformatted(styleText, self.descrStyle)

    def wrap(self, availWidth, availHeight):
        """Left 30% is for attributes, right 50% for sample,
        10% gutter each side."""
        self.x0 = availWidth * 0.05  #left of box
        self.x1 = availWidth * 0.1   #left of descriptive text
        self.x2 = availWidth * 0.5   #left of para itself
        self.x3 = availWidth * 0.9   #right of para itself
        self.x4 = availWidth * 0.95  #right of box
        self.width = self.x4 - self.x0
        self.dx = 0.5 * (availWidth - self.width)

        paw, self.pah = self.para.wrap(self.x3 - self.x2, availHeight)
        self.pah = self.pah + self.style.spaceBefore + self.style.spaceAfter
        prw, self.prh = self.pre.wrap(self.x2 - self.x1, availHeight)
        self.figureHeight = max(self.prh, self.pah) * 10.0/9.0
        return figures.Figure.wrap(self, availWidth, availHeight)

    def getStyleText(self, style):
        """Converts style to preformatted block of text"""
        lines = []
        for key, value in style.__dict__.items():
            lines.append('%s = %s' % (key, value))
        lines.sort()
        return '\n'.join(lines)

    def drawFigure(self):

        #now we fill in the bounding box and before/after boxes
        self.canv.saveState()
        self.canv.setFillGray(0.95)
        self.canv.setDash(1,3)
        self.canv.rect(self.x2 - self.x0,
                       self.figureHeight * 0.95 - self.pah,
                       self.x3-self.x2, self.para.height,
                       fill=1,stroke=1)

        self.canv.setFillGray(0.90)
        self.canv.rect(self.x2 - self.x0, #spaceBefore
                       self.figureHeight * 0.95 - self.pah + self.para.height,
                       self.x3-self.x2, self.style.spaceBefore,
                       fill=1,stroke=1)

        self.canv.rect(self.x2 - self.x0, #spaceBefore
                       self.figureHeight * 0.95 - self.pah - self.style.spaceAfter,
                       self.x3-self.x2, self.style.spaceAfter,
                       fill=1,stroke=1)

        self.canv.restoreState()
        #self.canv.setFillColor(colors.yellow)
        self.para.drawOn(self.canv, self.x2 - self.x0,
                         self.figureHeight * 0.95 - self.pah)
        self.pre.drawOn(self.canv, self.x1 - self.x0,
                         self.figureHeight * 0.95 - self.prh)


    def getStyleText(self, style):
        """Converts style to preformatted block of text"""
        lines = []
        for key, value in sorted(style.__dict__.items()):
            if key not in ('name','parent'):
                lines.append('%s = %s' % (key, value))
        return '\n'.join(lines)


class ParaBox2(figures.Figure):
    """Illustrates a paragraph side-by-side with the raw
    text, to show how the XML works."""
    def __init__(self, text, caption):
        figures.Figure.__init__(self, 0, 0, caption)
        descrStyle = ParagraphStyle('description',
                                fontName='Courier',
                                fontSize=8,
                                leading=9.6)
        textStyle = B
        self.text = text
        self.left = Paragraph(xmlEscape(text), descrStyle)
        self.right = Paragraph(text, B)


    def wrap(self, availWidth, availHeight):
        self.width = availWidth * 0.9
        colWidth = 0.4 * self.width
        lw, self.lh = self.left.wrap(colWidth, availHeight)
        rw, self.rh = self.right.wrap(colWidth, availHeight)
        self.figureHeight = max(self.lh, self.rh) * 10.0/9.0
        return figures.Figure.wrap(self, availWidth, availHeight)

    def drawFigure(self):
        self.left.drawOn(self.canv,
                         self.width * 0.05,
                         self.figureHeight * 0.95 - self.lh
                         )
        self.right.drawOn(self.canv,
                         self.width * 0.55,
                         self.figureHeight * 0.95 - self.rh
                         )

def parabox(text, style, caption):
    p = ParaBox(text, style,
                'Figure <seq template="%(Chapter)s-%(Figure+)s"/>: ' + quickfix(caption)
                )
    getStory().append(p)

def parabox2(text, caption):
    p = ParaBox2(text,
                'Figure <seq template="%(Chapter)s-%(Figure+)s"/>: ' + quickfix(caption)
                )
    getStory().append(p)

def pencilnote():
    getStory().append(examples.NoteAnnotation())


from reportlab.lib.colors import tan, green
def handnote(xoffset=0, size=None, fillcolor=tan, strokecolor=green):
    getStory().append(examples.HandAnnotation(xoffset,size,fillcolor,strokecolor))


#make a singleton, created when requested rather
#than each time a chapter imports it.
_story = []
def setStory(story=[]):
    global _story
    _story = story
def getStory():
    return _story
