"""Export des pointages au format ODS (tableur), par semaine ou par année."""
import io
from datetime import datetime, timedelta

from odf.opendocument import OpenDocumentSpreadsheet
from odf.style import Style, TableColumnProperties, TextProperties
from odf.table import Table, TableColumn, TableRow, TableCell
from odf.text import P

from calcul import compute_week, minutes_to_hhmm
from models import load_week_pointages, load_conges, list_all_weeks, load_plages, heures_jour_min

JOURS_FR = ["Lundi", "Mardi", "Mercredi", "Jeudi", "Vendredi"]
HEADERS = [
    "Date", "Jour", "Matin entrée", "Matin sortie", "Aprem entrée", "Aprem sortie",
    "Travaillé", "Dû", "Δ jour", "Congé",
]


def _week_dates(year: int, week: int) -> list[str]:
    first = datetime.strptime(f"{year}-W{week:02d}-1", "%G-W%V-%u").date()
    return [(first + timedelta(days=i)).strftime("%Y-%m-%d") for i in range(5)]


def _new_doc():
    doc = OpenDocumentSpreadsheet()
    bold = Style(name="Bold", family="table-cell")
    bold.addElement(TextProperties(fontweight="bold"))
    doc.styles.addElement(bold)
    wide_col = Style(name="WideCol", family="table-column")
    wide_col.addElement(TableColumnProperties(columnwidth="2.4cm"))
    doc.styles.addElement(wide_col)
    return doc, bold, wide_col


def _cell(text, style=None) -> TableCell:
    c = TableCell(stylename=style) if style else TableCell()
    c.addElement(P(text="" if text is None else str(text)))
    return c


def _header_row(bold: Style) -> TableRow:
    row = TableRow()
    for h in HEADERS:
        row.addElement(_cell(h, bold))
    return row


def _congé_label(cg: set) -> str:
    if "jour" in cg:
        return "Journée"
    parts = []
    if "matin" in cg:
        parts.append("Matin")
    if "aprem" in cg:
        parts.append("Après-midi")
    return " + ".join(parts)


def _jour_row(jour: dict, nom: str) -> TableRow:
    row = TableRow()
    for v in (
        jour["date"], nom,
        jour.get("matin_entree"), jour.get("matin_sortie"),
        jour.get("aprem_entree"), jour.get("aprem_sortie"),
        jour["travaille"], jour["du"],
        ("+" if jour["delta_min"] > 0 else "") + jour["delta"],
        _congé_label(jour["conge"]),
    ):
        row.addElement(_cell(v))
    return row


def _totals_row(bold: Style, travaille_min: int, du_min: int) -> TableRow:
    row = TableRow()
    for v in ("Total", "", "", "", "", "",
              minutes_to_hhmm(travaille_min), minutes_to_hhmm(du_min),
              ("+" if travaille_min - du_min > 0 else "") + minutes_to_hhmm(travaille_min - du_min),
              ""):
        row.addElement(_cell(v, bold))
    return row


def _size_columns(table: Table, wide_col: Style, n: int = len(HEADERS)):
    for _ in range(n):
        table.addElement(TableColumn(stylename=wide_col))


def export_semaine_ods(year: int, week: int, user_id: str) -> bytes:
    """Build an .ods workbook with the daily detail for a single week."""
    doc, bold, wide_col = _new_doc()
    h_jour = heures_jour_min()
    plages = load_plages(user_id)
    conges = load_conges(user_id)

    dates = _week_dates(year, week)
    raw = load_week_pointages(year, week, user_id)
    p_by_date = {p["date"]: p for p in raw}
    pointages = [
        p_by_date.get(d, {"date": d, "matin_entree": None, "matin_sortie": None,
                          "aprem_entree": None, "aprem_sortie": None})
        for d in dates
    ]
    result = compute_week(pointages, conges, h_jour, plages)

    table = Table(name=f"Semaine {week:02d}-{year}")
    _size_columns(table, wide_col)
    table.addElement(_header_row(bold))
    for jour, nom in zip(result["jours"], JOURS_FR):
        table.addElement(_jour_row(jour, nom))
    table.addElement(_totals_row(bold, sum(j["travaille_min"] for j in result["jours"]),
                                  sum(j["du_min"] for j in result["jours"])))
    doc.spreadsheet.addElement(table)

    buf = io.BytesIO()
    doc.save(buf)
    return buf.getvalue()


def export_annee_ods(year: int, user_id: str) -> bytes:
    """Build an .ods workbook with one sheet per week of the year, plus a yearly total."""
    doc, bold, wide_col = _new_doc()
    h_jour = heures_jour_min()
    plages = load_plages(user_id)
    conges = load_conges(user_id)

    weeks = sorted(wk for yr, wk in list_all_weeks(user_id) if yr == year)

    par_semaine = []  # (week, result, travaille_min, du_min)
    for week in weeks:
        dates = _week_dates(year, week)
        raw = load_week_pointages(year, week, user_id)
        p_by_date = {p["date"]: p for p in raw}
        pointages = [
            p_by_date.get(d, {"date": d, "matin_entree": None, "matin_sortie": None,
                              "aprem_entree": None, "aprem_sortie": None})
            for d in dates
        ]
        result = compute_week(pointages, conges, h_jour, plages)
        travaille_min = sum(j["travaille_min"] for j in result["jours"])
        du_min = sum(j["du_min"] for j in result["jours"])
        par_semaine.append((week, result, travaille_min, du_min))

    year_travaille = sum(t for _, _, t, _ in par_semaine)
    year_du = sum(d for _, _, _, d in par_semaine)

    recap = Table(name="Récapitulatif")
    _size_columns(recap, wide_col, n=4)
    header = TableRow()
    for h in ("Semaine", "Travaillé", "Dû", "Δ"):
        header.addElement(_cell(h, bold))
    recap.addElement(header)
    for week, _, travaille_min, du_min in par_semaine:
        row = TableRow()
        for v in (f"S{week:02d}", minutes_to_hhmm(travaille_min), minutes_to_hhmm(du_min),
                  ("+" if travaille_min - du_min > 0 else "") + minutes_to_hhmm(travaille_min - du_min)):
            row.addElement(_cell(v))
        recap.addElement(row)
    total_row = TableRow()
    for v in ("Total", minutes_to_hhmm(year_travaille), minutes_to_hhmm(year_du),
              ("+" if year_travaille - year_du > 0 else "") + minutes_to_hhmm(year_travaille - year_du)):
        total_row.addElement(_cell(v, bold))
    recap.addElement(total_row)
    # Le récapitulatif en première feuille pour une vue d'ensemble immédiate à l'ouverture.
    doc.spreadsheet.addElement(recap)

    for week, result, travaille_min, du_min in par_semaine:
        table = Table(name=f"S{week:02d}")
        _size_columns(table, wide_col)
        table.addElement(_header_row(bold))
        for jour, nom in zip(result["jours"], JOURS_FR):
            table.addElement(_jour_row(jour, nom))
        table.addElement(_totals_row(bold, travaille_min, du_min))
        doc.spreadsheet.addElement(table)

    buf = io.BytesIO()
    doc.save(buf)
    return buf.getvalue()