"""Paso 3: dimensiones físicas del buque."""

from __future__ import annotations

from PySide6.QtWidgets import (
    QDoubleSpinBox,
    QFormLayout,
    QLabel,
    QVBoxLayout,
    QWidget,
    QWizardPage,
)

from vmssailor.studio.theme import C_FOG, ui_font


class Step03Dimensions(QWizardPage):
    def __init__(self, parent: QWidget | None = None) -> None:
        super().__init__(parent)
        self.setTitle("Paso 3 · Dimensiones principales")
        self.setSubTitle(
            "Edita las dimensiones principales del buque. Los valores se pre-rellenan "
            "desde la plantilla del paso 2 si elegiste una."
        )

        layout = QVBoxLayout(self)
        layout.setSpacing(18)

        intro = QLabel(
            "Todas las medidas en metros (sistema internacional). "
            "Estos valores se usan en core para validar coordenadas de equipos y tarjetas."
        )
        intro.setWordWrap(True)
        intro.setStyleSheet(f"color: {C_FOG};")
        intro.setFont(ui_font(10))
        layout.addWidget(intro)

        form = QFormLayout()
        form.setHorizontalSpacing(20)
        form.setVerticalSpacing(14)

        self._loa = self._make_spin(1.0, 200.0, 24.0, " m", 1)
        form.addRow("Eslora total (LOA):", self._loa)

        self._beam = self._make_spin(1.0, 30.0, 5.5, " m", 2)
        form.addRow("Manga máxima:", self._beam)

        self._draft = self._make_spin(0.3, 10.0, 1.8, " m", 2)
        form.addRow("Calado:", self._draft)

        self._bh_aft = self._make_spin(0.0, 200.0, 4.0, " m desde Pp", 1)
        form.addRow("Mamparo popa sala máquinas:", self._bh_aft)

        self._bh_fwd = self._make_spin(0.0, 200.0, 8.0, " m desde Pp", 1)
        form.addRow("Mamparo proa sala máquinas:", self._bh_fwd)

        layout.addLayout(form)
        layout.addStretch(1)

        from vmssailor.studio.wizard.wizard import (
            F_BEAM,
            F_BULKHEAD_AFT,
            F_BULKHEAD_FWD,
            F_DRAFT,
            F_LOA,
        )

        self.registerField(F_LOA, self._loa, "value", "valueChanged")
        self.registerField(F_BEAM, self._beam, "value", "valueChanged")
        self.registerField(F_DRAFT, self._draft, "value", "valueChanged")
        self.registerField(F_BULKHEAD_AFT, self._bh_aft, "value", "valueChanged")
        self.registerField(F_BULKHEAD_FWD, self._bh_fwd, "value", "valueChanged")

    def _make_spin(self, lo: float, hi: float, default: float, suffix: str, decimals: int) -> QDoubleSpinBox:
        s = QDoubleSpinBox()
        s.setRange(lo, hi)
        s.setDecimals(decimals)
        s.setSingleStep(0.1 if decimals >= 1 else 1)
        s.setSuffix(suffix)
        s.setValue(default)
        s.setMinimumWidth(180)
        return s

    def initializePage(self) -> None:
        # If the user picked a template in step 2, pre-fill from it.
        from vmssailor.studio.wizard.wizard import F_TEMPLATE_ID

        wizard = self.wizard()
        tpl_id = self.field(F_TEMPLATE_ID)
        if not tpl_id or not wizard:
            return
        # Look up the step 2 page to get the template dict
        from vmssailor.studio.wizard.step_02_template import Step02Template

        for pid in range(8):
            page = wizard.page(pid)
            if isinstance(page, Step02Template):
                tpl = page.get_template()
                if tpl:
                    self._loa.setValue(tpl["length_overall_m"])
                    self._beam.setValue(tpl["beam_max_m"])
                    self._draft.setValue(tpl["draft_m"])
                    self._bh_aft.setValue(max(2.0, tpl["length_overall_m"] * 0.15))
                    self._bh_fwd.setValue(max(5.0, tpl["length_overall_m"] * 0.30))
                break