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, Table, TableStyle, Flowable
from reportlab.lib.units import mm, inch
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(session_state):
    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("Pilot Drafting", styles['Title'])]

    for page in session_state.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']))

            if page['input_key'] == 'workload_scope':
                story.extend(process_workload_scope(session_state, styles))
            elif page['input_key'] == 'useful_assets':
                story.extend(process_useful_assets(session_state, styles))
            elif page['input_key'] == 'pilot_evaluation':
                story.extend(process_pilot_evaluation(session_state, styles))

            story.append(Spacer(1, 12))

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

def process_workload_scope(session_state, styles):
    story = []
    answers = session_state.answers['workload_scope']

    story.append(Paragraph("Feature Prioritization", styles['Heading2']))
    for i, feature in enumerate(answers['feature_prioritization']):
        lines = feature.split('\n')
        for line in lines:
            story.append(Paragraph(f"<b>Feature {i+1}</b>: {line}", styles['Answer']))

    # story.append(Paragraph("Preferred Start Period", styles['Heading2']))
    # story.append(Paragraph(str(answers['preferred_start_period']), styles['Answer']))
    story.append(Paragraph("Preferred Start Period", styles['Heading2']))
    story.append(Paragraph(f"<b>{answers['preferred_start_period'][0]}</b> - <b>{answers['preferred_start_period'][1]}</b>", styles['Answer']))

    story.append(Paragraph("Team Composition", styles['Heading2']))
    for team_member in ['partner', 'ibm']:
        lines = answers['team_composition'][team_member].split('\n')
        for line in lines:
            story.append(Paragraph(f"<b>{team_member.capitalize()}</b>: {line}", styles['Answer']))

    return story

def process_useful_assets(session_state, styles):
    story = []
    answers = session_state.answers['useful_assets']

    story.append(Paragraph("Solution Elements", styles['Heading2']))
    for element in answers['solution_elements']:
        story.append(Paragraph(element, styles['Answer']))

    story.append(Paragraph("IBM Software", styles['Heading2']))
    for software in answers['ibm_software']:
        story.append(Paragraph(software, styles['Answer']))

    story.append(Paragraph("Open Source Supports", styles['Heading2']))
    for support in answers['open_source_supports']:
        story.append(Paragraph(support, styles['Answer']))

    return story

def process_pilot_evaluation(session_state, styles):
    story = []
    answers = session_state.answers['useful_assets']

    story.extend(process_validation_criteria(answers, styles))

    return story

def process_validation_criteria(session_state, styles):
    story = []

    # Qualitative Criteria
    story.append(Paragraph("Qualitative Criteria:", styles['Heading2']))
    for i, criterion in enumerate(session_state.get('qualitative', [])):
        description = session_state.get(f'qual_desc_{i}', '')
        story.append(Paragraph(f"<b>{criterion}</b>: <font face='Helvetica' size=11 color='#350863'>{description}</font>", styles['Answer']))

    # Quantitative Criteria
    story.append(Paragraph("Quantitative Criteria:", styles['Heading2']))
    for i, criterion in enumerate(session_state.get('quantitative', [])):
        parsed = parse_quantitative_criteria(criterion)
        if parsed:
            name, min_val, max_val, is_percentage, is_integer = parsed
            value = session_state.get(f'quant_value_{i}', min_val)

            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)
            story.append(Paragraph(f"<b>{name}</b>: {value:.2f}", styles['Answer']))

    return story

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

        # Handle percentage inputs
        is_percentage = '%' in min_val or '%' in max_val
        min_val = float(min_val.rstrip('%'))
        max_val = float(max_val.rstrip('%'))

        if is_percentage:
            min_val /= 100
            max_val /= 100

        is_integer = '.' not in input_string or (min_val.is_integer() and max_val.is_integer())

        return name, min_val, max_val, is_percentage, is_integer
    return None