import io
import re
from reportlab.lib import colors
from reportlab.lib.pagesizes import A4
from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle
from reportlab.platypus import SimpleDocTemplate, Paragraph, Spacer, Flowable
from reportlab.lib.units import mm
from reportlab.graphics.shapes import Drawing, Rect, String, Line

class SliderFlowable(Flowable):
    def __init__(self, name, value, min_val, max_val, is_percentage=False):
        Flowable.__init__(self)
        self.name = name
        self.value = value
        self.min_val = min_val
        self.max_val = max_val
        self.is_percentage = is_percentage
        self.width = 400
        self.height = 80

    def draw(self):
        drawing = Drawing(self.width, self.height)

        # Draw slider bar
        bar = Rect(50, 30, 300, 20, fillColor=colors.HexColor("#f7fbfd"), strokeColor=colors.HexColor("#9999ff"))
        drawing.add(bar)

        # Draw slider value
        if self.max_val == self.min_val:
            value_width = 50  # or some default width
        else:
            value_width = 50 + ((self.value - self.min_val) / (self.max_val - self.min_val) * 300)
        value_bar = Rect(50, 30, value_width - 50, 20, fillColor=colors.HexColor("#9999ff"), strokeColor=None)
        drawing.add(value_bar)

        # Add slider name
        drawing.add(String(0, 60, self.name, fontSize=12, fillColor=colors.HexColor("#26004d")))

        # Add range labels
        min_str = f"{self.min_val:.1f}%" if self.is_percentage else f"{self.min_val:.1f}"
        max_str = f"{self.max_val:.1f}%" if self.is_percentage else f"{self.max_val:.1f}"
        drawing.add(String(40, 10, min_str, fontSize=10, fillColor=colors.HexColor("#26004d")))
        drawing.add(String(340, 10, max_str, fontSize=10, fillColor=colors.HexColor("#26004d")))

        # Add value label
        value_str = f"{self.value:.1f}%" if self.is_percentage else f"{self.value:.1f}"
        drawing.add(String(value_width - 20, 55, value_str, fontSize=10, fillColor=colors.HexColor("#26004d")))

        # Add value marker
        drawing.add(Line(value_width, 25, value_width, 55, strokeColor=colors.HexColor("#26004d"), strokeWidth=2))

        drawing.drawOn(self.canv, 0, 0)

def create_styles():
    styles = getSampleStyleSheet()
    styles['Title'].fontName = 'Helvetica-Bold'
    styles['Title'].fontSize = 18
    styles['Title'].spaceAfter = 16
    styles['Title'].textColor = colors.HexColor("#26004d")

    styles['Heading1'].fontName = 'Helvetica-Bold'
    styles['Heading1'].fontSize = 16
    styles['Heading1'].spaceAfter = 10
    styles['Heading1'].textColor = colors.HexColor("#3b0b75")

    styles['Heading2'].fontName = 'Helvetica'
    styles['Heading2'].fontSize = 14
    styles['Heading2'].spaceAfter = 12
    styles['Heading2'].textColor = colors.HexColor("#52176a")

    styles['BodyText'].fontName = 'Helvetica'
    styles['BodyText'].fontSize = 12
    styles['BodyText'].spaceAfter = 12
    styles['BodyText'].textColor = colors.HexColor("#26004d")

    styles.add(ParagraphStyle(
        name='Answer',
        parent=styles['BodyText'],
        backColor=colors.HexColor("#f0f2fd"),
        borderColor=colors.HexColor("#9999ff"),
        borderWidth=0.5,
        borderPadding=(5, 5, 5, 5),
        spaceAfter=10
    ))

    return styles

def create_page_template(canvas, doc):
    canvas.saveState()
    canvas.setFillColor(colors.HexColor("#e6ebfb"))
    canvas.rect(0, 0, doc.pagesize[0], doc.pagesize[1], fill=1)
    canvas.setFillColor(colors.HexColor("#26004d"))
    canvas.setFont('Helvetica', 9)
    canvas.drawString(30, 20, f"Page {doc.page}")
    canvas.restoreState()

def generate_pdf(pages, answers):
    buffer = io.BytesIO()
    doc = SimpleDocTemplate(buffer, pagesize=A4, rightMargin=20*mm, leftMargin=20*mm, topMargin=20*mm, bottomMargin=20*mm)
    styles = create_styles()
    story = [Paragraph("AI Trust and Opacity Evaluation", styles['Title'])]

    for page in pages[:-1]:  # Skip the last page
        if 'input_key' in page and page['input_key'] is not None:
            story.append(Paragraph(page['title'], styles['Heading1']))
            story.append(Paragraph(page['content'], styles['BodyText']))

            answer = answers.get(page['input_key'], "")
            if isinstance(answer, list):
                answer = ', '.join(answer)

            if page.get('input_type') == 'combined':
                option = answers.get(page['input_key'], "")
                conclusion = answers.get(f"{page['input_key']}_conclusion", "")
                story.append(Paragraph(f"<b>Option selected:</b> {option}", styles['Answer']))
                story.append(Paragraph(f"<b>Conclusion:</b> {conclusion}", styles['Answer']))
            else:
                story.append(Paragraph(f"<b>Answer:</b> {answer}", styles['Answer']))

            # Add quantitative criteria visualization if applicable
            if page['input_key'] in ['technological_literacy', 'cognitive_mismatch']:
                story.extend(process_quantitative_criteria(answer, styles))

            story.append(Spacer(1, 12))

    doc.build(story, onFirstPage=create_page_template, onLaterPages=create_page_template)
    buffer.seek(0)
    return buffer

def process_quantitative_criteria(answer, styles):
    story = []
    lines = answer.split('\n')
    for line in lines:
        parsed = parse_quantitative_criteria(line)
        if parsed:
            name, value, min_val, max_val, is_percentage = parsed
            if is_percentage:
                slider = SliderFlowable(name, value*100, min_val*100, max_val*100, is_percentage=True)
            else:
                slider = SliderFlowable(name, value, min_val, max_val, is_percentage=False)
            story.append(slider)
    return story

def parse_quantitative_criteria(input_string):
    match = re.match(r'(.+):\s*([-+]?(?:\d*\.*\d+)(?:%)?)(?:\s*\[([-+]?(?:\d*\.*\d+)(?:%)?)\s*-\s*([-+]?(?:\d*\.*\d+)(?:%)?)?\])?', input_string)
    if match:
        name, value, min_val, max_val = match.groups()
        name = name.strip()

        # Handle percentage inputs
        is_percentage = '%' in value or '%' in min_val or '%' in max_val
        value = float(value.rstrip('%'))
        min_val = float(min_val.rstrip('%') if min_val else 0)
        max_val = float(max_val.rstrip('%') if max_val else 100)

        if is_percentage:
            value /= 100
            min_val /= 100
            max_val /= 100

        return name, value, min_val, max_val, is_percentage
    return None