"""
WizardBar — barra step orizzontale per workflow guidati del Linker.
Si inserisce tra la toolbar e la griglia.
"""
from PyQt6.QtWidgets import QWidget, QHBoxLayout, QFrame, QSizePolicy
from PyQt6.QtCore import Qt, pyqtSignal, QRect, QPoint
from PyQt6.QtGui import QPainter, QColor, QFont, QPen, QBrush


# ------------------------------------------------------------------ #
#  Singolo step                                                        #
# ------------------------------------------------------------------ #

class _StepWidget(QWidget):
    clicked = pyqtSignal(int)   # emette il proprio indice

    ACTIVE    = 'active'
    COMPLETED = 'completed'
    PENDING   = 'pending'

    _COLORS = {
        ACTIVE:    ('#5C6BC0', '#FFFFFF', '#1a1a2e', True),
        COMPLETED: ('#43A047', '#FFFFFF', '#444444', False),
        PENDING:   ('#C8C8C8', '#888888', '#999999', False),
    }

    def __init__(self, index: int, label: str, parent=None):
        super().__init__(parent)
        self.index = index
        self.label = label
        self.state = self.PENDING
        self.setFixedHeight(40)
        self.setMinimumWidth(130)
        self.setSizePolicy(QSizePolicy.Policy.Expanding, QSizePolicy.Policy.Fixed)
        self.setCursor(Qt.CursorShape.PointingHandCursor)

    def set_state(self, state: str):
        self.state = state
        self.update()

    def paintEvent(self, _event):
        p = QPainter(self)
        p.setRenderHint(QPainter.RenderHint.Antialiasing)

        h   = self.height()
        cx  = 22          # circle center X
        cy  = h // 2
        r   = 11

        bg, fg, lbl_color, bold = self._COLORS[self.state]

        # Circle
        p.setBrush(QBrush(QColor(bg)))
        p.setPen(Qt.PenStyle.NoPen)
        p.drawEllipse(QPoint(cx, cy), r, r)

        # Number or checkmark
        p.setPen(QPen(QColor(fg)))
        f = QFont('Segoe UI', 8, QFont.Weight.Bold)
        p.setFont(f)
        symbol = '✓' if self.state == self.COMPLETED else str(self.index + 1)
        p.drawText(QRect(cx - r, cy - r, r * 2, r * 2),
                   Qt.AlignmentFlag.AlignCenter, symbol)

        # Label
        p.setPen(QPen(QColor(lbl_color)))
        lf = QFont('Segoe UI', 9, QFont.Weight.Bold if bold else QFont.Weight.Normal)
        p.setFont(lf)
        p.drawText(QRect(cx + r + 7, 0, self.width() - cx - r - 9, h),
                   Qt.AlignmentFlag.AlignVCenter | Qt.AlignmentFlag.AlignLeft,
                   self.label)
        p.end()

    def mousePressEvent(self, _event):
        if self.state != self.PENDING:
            self.clicked.emit(self.index)


# ------------------------------------------------------------------ #
#  Barra wizard completa                                               #
# ------------------------------------------------------------------ #

class WizardBar(QFrame):
    """
    Barra step orizzontale con 4 fasi.
    Emette step_requested(index) quando l'utente clicca uno step navigabile.
    """
    step_requested = pyqtSignal(int)

    STEPS = ['Carica listino', 'Aggancio', 'Revisiona']

    def __init__(self, parent=None):
        super().__init__(parent)
        self.setFrameShape(QFrame.Shape.NoFrame)
        self.setFixedHeight(44)
        self.setStyleSheet('background-color: #EDE7F6; border-bottom: 1px solid #C5B8E8;')

        layout = QHBoxLayout(self)
        layout.setContentsMargins(16, 2, 16, 2)
        layout.setSpacing(0)

        self._steps: list[_StepWidget] = []

        for i, label in enumerate(self.STEPS):
            step = _StepWidget(i, label, self)
            step.clicked.connect(self.step_requested)
            self._steps.append(step)
            layout.addWidget(step)

            if i < len(self.STEPS) - 1:
                sep = QFrame()
                sep.setFrameShape(QFrame.Shape.HLine)
                sep.setFixedHeight(1)
                sep.setFixedWidth(28)
                sep.setStyleSheet('background: #B39DDB; border: none;')
                layout.addWidget(sep)

        # Step 0 parte attivo
        self._current = 0
        self._steps[0].set_state(_StepWidget.ACTIVE)

    # ---------------------------------------------------------------- #

    def set_step(self, index: int):
        """Avanza al passo index, marcando i precedenti come completati."""
        self._current = index
        for i, step in enumerate(self._steps):
            if i < index:
                step.set_state(_StepWidget.COMPLETED)
            elif i == index:
                step.set_state(_StepWidget.ACTIVE)
            else:
                step.set_state(_StepWidget.PENDING)

    def current_step(self) -> int:
        return self._current

    def reset(self):
        self.set_step(0)


class WizardBarValutazioni(WizardBar):
    """Variante della WizardBar per il workflow Valutazioni Reti."""
    STEPS = ['Incolla', 'Verifica IMDB', 'Archivia']