"""Configure the restoration ("расцензурить") engine.

inpaint — no setup. deepmosaics — point at a user-installed DeepMosaics folder and
its clean weights; a CUDA GPU is strongly recommended (set GPU id, -1 = CPU/slow).
"""

from __future__ import annotations

from pathlib import Path

from PySide6.QtWidgets import (
    QComboBox,
    QDialog,
    QDialogButtonBox,
    QFileDialog,
    QFormLayout,
    QHBoxLayout,
    QLabel,
    QLineEdit,
    QPushButton,
    QWidget,
)

from ..config import AppConfig


class RestoreDialog(QDialog):
    def __init__(self, config: AppConfig, parent: QWidget | None = None) -> None:
        super().__init__(parent)
        self._cfg = config
        self.setWindowTitle("Движок восстановления")
        self.setMinimumWidth(520)

        self.engine = QComboBox()
        self.engine.addItem("Инпейнт (быстро, замазывает — без модели)", "inpaint")
        self.engine.addItem("DeepMosaics (реальное расцензуривание, нужна модель+GPU)", "deepmosaics")
        self.engine.setCurrentIndex(1 if config.restorer == "deepmosaics" else 0)
        self.engine.currentIndexChanged.connect(self._sync)

        self.dm_dir = QLineEdit(config.dm_dir or "")
        self.dm_model = QLineEdit(config.dm_model or "")
        self.dm_python = QLineEdit(config.dm_python or "")
        self.dm_python.setPlaceholderText("по умолчанию — python текущего venv")
        self.dm_gpu = QLineEdit(config.dm_gpu or "0")
        self.dm_gpu.setPlaceholderText("0 = первая CUDA-карта, -1 = CPU (медленно)")

        form = QFormLayout(self)
        form.addRow("Движок:", self.engine)
        form.addRow("Папка DeepMosaics:", self._with_browse(self.dm_dir, self._browse_dir))
        form.addRow("Веса (clean_*.pth):", self._with_browse(self.dm_model, self._browse_model))
        form.addRow("Python для DeepMosaics:", self._with_browse(self.dm_python, self._browse_python))
        form.addRow("GPU id:", self.dm_gpu)
        hint = QLabel(
            "DeepMosaics ставится отдельно (git clone + зависимости). Рядом с весами "
            "clean_*.pth должен лежать mosaic_position.pth.\n"
            "Для покадрового режима берите clean_youknow_resnet_9blocks.pth — "
            "видеомодель clean_youknow_video.pth покадрово не работает. См. README."
        )
        hint.setWordWrap(True)
        form.addRow(hint)

        buttons = QDialogButtonBox(QDialogButtonBox.Ok | QDialogButtonBox.Cancel)
        buttons.accepted.connect(self.accept)
        buttons.rejected.connect(self.reject)
        form.addRow(buttons)
        self._sync()

    def _with_browse(self, line: QLineEdit, slot) -> QWidget:
        w = QWidget()
        h = QHBoxLayout(w)
        h.setContentsMargins(0, 0, 0, 0)
        h.addWidget(line, 1)
        btn = QPushButton("…")
        btn.setMaximumWidth(32)
        btn.clicked.connect(slot)
        h.addWidget(btn)
        return w

    def _sync(self) -> None:
        is_dm = self.engine.currentData() == "deepmosaics"
        for w in (self.dm_dir, self.dm_model, self.dm_python, self.dm_gpu):
            w.setEnabled(is_dm)

    def _browse_dir(self) -> None:
        d = QFileDialog.getExistingDirectory(self, "Папка DeepMosaics", self.dm_dir.text())
        if d:
            self.dm_dir.setText(d)

    def _browse_model(self) -> None:
        start = self.dm_model.text() or self.dm_dir.text()
        p, _ = QFileDialog.getOpenFileName(self, "Веса DeepMosaics", start, "Веса (*.pth);;Все файлы (*.*)")
        if p:
            self.dm_model.setText(p)

    def _browse_python(self) -> None:
        p, _ = QFileDialog.getOpenFileName(self, "Python для DeepMosaics", self.dm_python.text(), "python (*.exe);;Все файлы (*.*)")
        if p:
            self.dm_python.setText(p)

    def apply_to_config(self) -> None:
        self._cfg.restorer = self.engine.currentData()
        self._cfg.dm_dir = self.dm_dir.text().strip() or None
        self._cfg.dm_model = self.dm_model.text().strip() or None
        self._cfg.dm_python = self.dm_python.text().strip() or None
        self._cfg.dm_gpu = self.dm_gpu.text().strip() or "0"