"""
===============================================================================
FILE: services/reports/otchet_builder.py
ROLE: Генератор книги Детального суточного отчета со сверкой 1С:ЗУП.
===============================================================================
"""

import os
import math
import pandas as pd
import xlsxwriter
from services.reports.styles import get_dated_reports_dir, format_date_ru, safe_close_workbook, create_xlsx_format
from services.reports.calculators import calculate_deviation


def generate_detailed_excel(merged_df, date_str="20.08.2026", filename=None):
    date_clean = str(date_str).replace('_', '.')
    if not filename:
        filename = f"{format_date_ru(date_clean)} отчет.xlsx"

    df_export = merged_df[merged_df.get('is_excluded', False) == False].copy() if merged_df is not None and not merged_df.empty else pd.DataFrame()

    target_dir = get_dated_reports_dir(date_clean)
    output_path = os.path.join(target_dir, filename)

    wb = xlsxwriter.Workbook(output_path)
    ws = wb.add_worksheet("Детальный_отчет")

    fmt_date_lbl = wb.add_format({'font_name': 'Arial', 'font_size': 10, 'bold': True})
    ws.write(1, 1, "Дата:", fmt_date_lbl)
    ws.write(1, 3, date_clean, fmt_date_lbl)

    headers = [
        "№", "ФИО", "Подразделение", "время входа", "первая активность", "время выхода",
        "находился в здании", "причина отсутствия", "норма", "отклонение от нормы"
    ]
    fmt_hdr = create_xlsx_format(wb, font_name='Arial', font_size=10, bg_color='#D9E1F2', bold=True, align="center", wrap=True)
    ws.set_row(3, 26)
    for col_idx, h_text in enumerate(headers):
        ws.write(3, col_idx, h_text, fmt_hdr)

    start_col = 'Начало дня' if 'Начало дня' in df_export.columns else 'Начало_дня'
    end_col = 'Конец дня' if 'Конец дня' in df_export.columns else 'Конец_дня'
    hours_col = 'Часы' if 'Часы' in df_export.columns else 'Находился_в_здании'
    chars_per_line_h = 24

    for idx, row in df_export.reset_index(drop=True).iterrows():
        row_num = 4 + idx
        is_present = row.get('Пришел', False)
        absence_reason = row.get('Вид_отсутствия', '')
        has_reason = pd.notna(absence_reason) and str(absence_reason).strip() != ''

        in_val = str(row.get(start_col, 'Нет входа')).strip()
        out_val = str(row.get(end_col, 'Нет выхода')).strip()
        in_building_str = str(row.get(hours_col, '00:00'))
        first_act_val = str(row.get('Первая_активность', '—')).strip()
        has_first_act = first_act_val not in ['—', '', 'None', 'nan']

        deviation_val = calculate_deviation(in_building_str, reason=absence_reason if has_reason else "", norm_hours=8, lunch_minutes=30)
        dept_scud_val = row.get('department_scud', row.get('department', row.get('Подразделение', '')))

        row_color = None
        if is_present and has_reason:
            row_color = '#E2EFDA'
        elif not is_present and has_reason:
            row_color = '#FFF2CC'
        elif not is_present and not has_reason and not has_first_act:
            row_color = '#FCE4D6'

        val_h_str = str(absence_reason) if has_reason else ""
        lines_count = math.ceil(len(val_h_str) / chars_per_line_h) if len(val_h_str) > chars_per_line_h else 1
        ws.set_row(row_num, max(lines_count * 18, 20))

        values = [
            (idx + 1, 'center', False),
            (row.get('Сотрудник', ''), 'left', False),
            (dept_scud_val, 'center', False),
            (in_val, 'center', False),
            (first_act_val, 'center', False),
            (out_val, 'center', False),
            (in_building_str, 'center', False),
            (absence_reason if has_reason else '', 'left', True),
            (8, 'center', False),
            (deviation_val, 'center', False)
        ]

        for col_idx, (val, align_type, is_wrap) in enumerate(values):
            fmt = create_xlsx_format(wb, font_name='Arial', font_size=10, bg_color=row_color, align=align_type, wrap=is_wrap)
            ws.write(row_num, col_idx, val, fmt)

    col_widths = {0: 4, 1: 33, 2: 13, 3: 11, 4: 11, 5: 11, 6: 12, 7: 24, 8: 6, 9: 11}
    for col_idx, width in col_widths.items():
        ws.set_column(col_idx, col_idx, width)

    safe_close_workbook(wb, output_path, target_dir, filename)