from html import escape
from typing import List

from ..report_builder import group_rows_by_project_and_version
from ..types import ReportRow
from .base import Formatter


class HTMLFormatter(Formatter):
    """Форматтер для экспорта отчёта в HTML."""

    def __init__(self, **_kwargs):
        super().__init__()

    def format(self, rows: List[ReportRow]) -> str:
        projects = group_rows_by_project_and_version(rows)

        lines = [
            '<table border="1" cellpadding="6" cellspacing="0" style="border-collapse: collapse; font-family: Arial, sans-serif;">',
            "  <thead>",
            "    <tr>",
            "      <th>Наименование Проекта</th>",
            "      <th>Номер версии*</th>",
            "      <th>Задача</th>",
            "      <th>Статус Готовность*</th>",
            "      <th>Затрачено за отчетный период</th>",
            "    </tr>",
            "  </thead>",
            "  <tbody>",
        ]

        for project, versions in projects.items():
            project_text = escape(project)
            total_project_rows = sum(len(tasks) for tasks in versions.values())
            first_version_in_project = True

            for version, task_rows in versions.items():
                version_text = escape(version)
                row_span_version = len(task_rows)
                first_row_in_version = True

                for r in task_rows:
                    task_cell = escape(f"{r['issue_id']}. {r['subject']}")
                    status_text = escape(r["status_ru"])
                    time_text = escape(r["time_text"])
                    lines.append("    <tr>")

                    # Ячейка "Проект" - только в первой строке проекта
                    if first_version_in_project and first_row_in_version:
                        lines.append(
                            f'      <td rowspan="{total_project_rows}" style="vertical-align: top;">{project_text}</td>'
                        )

                    # Ячейка "Версия" - только в первой строке версии
                    if first_row_in_version:
                        lines.append(
                            f'      <td rowspan="{row_span_version}" style="vertical-align: top;">{version_text}</td>'
                        )
                        first_row_in_version = False

                    # Остальные колонки
                    lines.append(f"      <td>{task_cell}</td>")
                    lines.append(f"      <td>{status_text}</td>")
                    lines.append(f"      <td>{time_text}</td>")

                    lines.append("    </tr>")

                first_version_in_project = False

        lines.append("  </tbody>")
        lines.append("</table>")
        return "\n".join(lines)

    def save(self, rows: List[ReportRow], output_path: str) -> None:
        content = self.format(rows)
        with open(output_path, "w", encoding="utf-8") as f:
            f.write(content)