#!/usr/bin/env python3
"""
Generate personalized brevet cards from CSV and event config.
"""
import csv
import sys
from pathlib import Path

try:
    import yaml
except ImportError:
    print("Error: PyYAML not installed. Run: pip install pyyaml", file=sys.stderr)
    sys.exit(1)


def escape_latex(text):
    """Escape special LaTeX characters."""
    if not text:
        return ""
    replacements = {
        '&': r'\&',
        '%': r'\%',
        '$': r'\$',
        '#': r'\#',
        '_': r'\_',
        '{': r'\{',
        '}': r'\}',
        '~': r'\textasciitilde{}',
        '^': r'\textasciicircum{}',
        '\\': r'\textbackslash{}',
    }
    result = str(text)
    for char, replacement in replacements.items():
        result = result.replace(char, replacement)
    return result


def load_event_config(config_file):
    """Load event configuration from YAML file."""
    with open(config_file, 'r', encoding='utf-8') as f:
        return yaml.safe_load(f)


def apply_event_placeholders(text, config):
    """Replace event-level placeholders in a template string."""
    event = config.get('event', {})
    replacements = {
        '{{EVENT_TITLE}}':    escape_latex(event.get('title', '')),
        '{{EVENT_KM}}':       escape_latex(event.get('km', '')),
        '{{EVENT_DATE}}':     escape_latex(event.get('date', '')),
        '{{EVENT_START}}':    escape_latex(event.get('start_location', '')),
        '{{EVENT_CLUB}}':     escape_latex(event.get('club', '')),
        '{{EVENT_CLUB_NR}}':  escape_latex(event.get('club_nr', '')),
        '{{EVENT_STARTZEIT}}': escape_latex(event.get('startzeit', '')),
    }
    for placeholder, value in replacements.items():
        text = text.replace(placeholder, value)
    return text


def generate_backside(template, config):
    """Fill back side template with cell content from event config."""
    cells = config.get('backside', {})
    result = template
    for row in range(1, 4):
        for col in range(1, 5):
            key = f"{row}_{col}"
            placeholder = f"{{{{CELL_{row}_{col}}}}}"
            content = cells.get(key, "")
            if content is None:
                content = ""
            result = result.replace(placeholder, content.strip())
    return result


def generate_card_from_template(template, data):
    """Replace participant placeholders in template with participant data."""
    name = f"{escape_latex(data['Vorname'])} {escape_latex(data['Nachname'])}"
    street = escape_latex(data['Straße'])
    plz_ort = f"{escape_latex(data['PLZ'])} {escape_latex(data['Ort'])}"
    land = escape_latex(data['Land'])
    medaille = "Ja" if data['Medaille'].lower() == 'ja' else "Nein"
    startnr = escape_latex(data['Startnr'])

    card = template.replace('{{NAME}}', name)
    card = card.replace('{{STREET}}', street)
    card = card.replace('{{PLZ_ORT}}', plz_ort)
    card = card.replace('{{LAND}}', land)
    card = card.replace('{{MEDAILLE}}', medaille)
    card = card.replace('{{STARTNR}}', startnr)

    return card


def main():
    csv_file = Path("Export Brevetkarte.csv")
    template_file = Path("brevetkarte-template.tex")
    backside_template_file = Path("brevetkarte-rueckseite-template.tex")
    event_config_file = Path("event.yml")
    output_file = Path("brevetkarte-personalized.tex")
    backside_output_file = Path("brevetkarte-rueckseite.tex")

    for f in [csv_file, template_file, backside_template_file, event_config_file]:
        if not f.exists():
            print(f"Error: {f} not found!", file=sys.stderr)
            sys.exit(1)

    print(f"Reading event config from {event_config_file}...")
    event_config = load_event_config(event_config_file)

    print(f"Reading template from {template_file}...")
    template = template_file.read_text(encoding='utf-8')
    template = apply_event_placeholders(template, event_config)

    print(f"Reading participant data from {csv_file}...")
    participants = []
    with open(csv_file, 'r', encoding='utf-8-sig') as f:
        reader = csv.DictReader(f)
        for row in reader:
            if row['Startnr']:
                participants.append(row)

    if not participants:
        print("No participants found in CSV file!", file=sys.stderr)
        sys.exit(1)

    print(f"Found {len(participants)} participant(s)")

    # Generate personalized front side
    cards = []
    for participant in participants:
        card = generate_card_from_template(template, participant)
        cards.append(card)

    document_parts = []
    for i, card in enumerate(cards):
        document_parts.append(card)
        if i % 2 == 0 and i < len(cards) - 1:
            document_parts.append("\n\\vspace{0.8cm}\n\n")
        if i % 2 == 1 and i < len(cards) - 1:
            document_parts.append("\n\\newpage\n\n")

    document_parts.append("\n\\end{document}\n")
    output_file.write_text(''.join(document_parts), encoding='utf-8')
    print(f"Generated {output_file}")

    # Generate personalized back side
    print(f"Reading back side template from {backside_template_file}...")
    backside_template = backside_template_file.read_text(encoding='utf-8')
    backside_output = generate_backside(backside_template, event_config)
    backside_output_file.write_text(backside_output, encoding='utf-8')
    print(f"Generated {backside_output_file}")

    print(f"Total pages: {(len(participants) + 1) // 2}")
    print(f"Compile with: make build-personalized")


if __name__ == "__main__":
    main()