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path: root/prediction_report_service.py
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from datetime import datetime
from typing import List

from PyQt5.QtGui import QTextDocument
from PyQt5.QtPrintSupport import QPrinter

from calendar_manager import CalendarManager
from prediction_controller import PredictionController
from date_service import DateService


class PredictionReportService:
    """Service to export the current prediction and entries into a PDF report."""

    @staticmethod
    def export_pdf(calendar_manager: CalendarManager,
                   prediction_controller: PredictionController,
                   out_path: str,
                   dateformat: str = "dd.MM.yyyy") -> bool:
        try:
            # Gather data
            launch_dt = prediction_controller.get_launch_date()
            duration = prediction_controller.get_duration()
            prediction_dt = prediction_controller.get_prediction()
            entries = calendar_manager.list_entries()

            # Format helpers
            def fmt_date(dt):
                return DateService.format_date_for_display(dt, dateformat) if dt else ""

            launch_str = fmt_date(launch_dt)
            duration_str = f"{duration.years} Jahre" if duration and hasattr(duration, 'years') else ""
            prediction_str = fmt_date(prediction_dt)

            # Sum time_periods (months and days separately)
            total_months = 0
            total_days = 0
            for e in entries:
                tp = getattr(e, 'time_period', None)
                if not tp:
                    continue
                try:
                    parts = tp.split()
                    if len(parts) >= 2:
                        value = int(parts[0])
                        unit = parts[1].lower()
                        if value > 0:
                            if 'monat' in unit:
                                total_months += value
                            elif 'tag' in unit:
                                total_days += value
                except Exception:
                    # Ignore unparsable time_periods
                    pass

            sum_parts = []
            if total_months > 0:
                sum_parts.append(f"{total_months} Monate")
            if total_days > 0:
                sum_parts.append(f"{total_days} Tage")
            sum_str = ", ".join(sum_parts) if sum_parts else "0"

            # Build HTML
            created_stamp = datetime.now().strftime('%d.%m.%Y %H:%M:%S')
            html = []
            html.append("<html><head><meta charset='utf-8'>")
            html.append("""
                <style>
                body { font-family: Arial, sans-serif; color: #222; }
                h1 { font-size: 20px; margin-bottom: 6px; }
                .meta { margin-bottom: 12px; }
                .meta div { margin: 2px 0; }
                table { border-collapse: collapse; width: 100%; }
                th, td { border: 1px solid #e1e4ee; padding: 4px 6px; vertical-align: top; font-size: 150px; line-height: 1.3; }
                th { background: #f5f7fb; text-align: left; }
                tfoot td { font-weight: bold; }
                .stamp { margin-top: 16px; font-size: 10px; color: #666; }
                </style>
            """)
            html.append("</head><body>")
            html.append("<h1>Ausfallzeitenrechner — Bericht</h1>")
            html.append("<div class='meta'>")
            html.append(f"<div><strong>Promotionsdatum:</strong> {launch_str}</div>")
            html.append(f"<div><strong>Bewerbungszeitraum:</strong> {duration_str}</div>")
            html.append(f"<div><strong>Bewerbungsfrist:</strong> {prediction_str}</div>")
            html.append("</div>")

            # Table header
            html.append("<table>")
            html.append(
                "<thead><tr>"
                "<th>Beginn</th>"
                "<th>Ende</th>"
                "<th>Art</th>"
                "<th>Kommentar</th>"
                "<th>Beginn Anrechnung</th>"
                "<th>Ende Anrechnung</th>"
                "<th>Anrechnungszeitraum</th>"
                "</tr></thead><tbody>"
            )

            # Rows
            for e in entries:
                start_text = fmt_date(e.start_date)
                end_text = fmt_date(e.end_date)
                keyword_text = e.keyword
                commentary_text = getattr(e, 'commentary', '') or ''
                c_start_text = fmt_date(getattr(e, 'corrected_start_date', None))
                c_end_text = fmt_date(getattr(e, 'corrected_end_date', None))
                time_text = getattr(e, 'time_period', '') or ''

                # Escape
                def esc(s: str) -> str:
                    return (s.replace('&', '&amp;')
                             .replace('<', '&lt;')
                             .replace('>', '&gt;'))

                html.append(
                    f"<tr><td>{esc(start_text)}</td>"
                    f"<td>{esc(end_text)}</td>"
                    f"<td>{esc(keyword_text)}</td>"
                    f"<td>{esc(commentary_text)}</td>"
                    f"<td>{esc(c_start_text)}</td>"
                    f"<td>{esc(c_end_text)}</td>"
                    f"<td>{esc(time_text)}</td></tr>"
                )

            html.append("</tbody>")
            html.append(f"<tfoot><tr><td colspan='7'>Summe Anrechnungszeitraum: {sum_str}</td></tr></tfoot>")
            html.append("</table>")

            html.append(f"<div class='stamp'>Erstellt am: {created_stamp}</div>")
            html.append("</body></html>")

            # Ensure extension
            if not out_path.lower().endswith('.pdf'):
                out_path = out_path + '.pdf'

            # Render HTML to PDF
            printer = QPrinter(QPrinter.HighResolution)
            printer.setOutputFormat(QPrinter.PdfFormat)
            printer.setOutputFileName(out_path)
            # Try to set margins (not all bindings support Millimeter overload)
            try:
                printer.setPageMargins(12, 12, 12, 12, QPrinter.Millimeter)
            except Exception:
                pass

            doc = QTextDocument()
            doc.setHtml("".join(html))
            doc.print_(printer)

            return True
        except Exception as e:
            print(f"Error exporting PDF: {e}")
            return False