import sys
import os
from PyQt6.QtWidgets import (
    QDialog, QHBoxLayout, QVBoxLayout, QListWidget, QListWidgetItem,
    QStackedWidget, QWidget, QLabel, QSlider, QPushButton,
    QCheckBox, QGroupBox, QFormLayout, QSpinBox, QFrame, QLineEdit, QFileDialog
)
from PyQt6.QtCore import Qt, QSize
from PyQt6.QtWidgets import QMessageBox
from PyQt6.QtGui import QIcon, QPixmap
import qtawesome as qta
from db import database
import ui.theme as theme
import ui.dialog_style as dialog_style
from app_info import APP_NAME, __VERSION__


class SettingsWindow(QDialog):
    def __init__(self, panel, parent=None):
        super().__init__(parent)
        self._panel = panel
        self.setWindowTitle("设置")
        # 适当放大：让页面内容更舒展，并限制最小拖拽尺寸
        self.setMinimumSize(500, 500)
        self.resize(760, 520)
        self.setWindowFlags(
            Qt.WindowType.Dialog |
            Qt.WindowType.WindowCloseButtonHint
        )
        self._build_ui()
        self._apply_theme()

    def _build_ui(self):
        root = QHBoxLayout(self)
        root.setContentsMargins(0, 0, 0, 0)
        root.setSpacing(0)

        # ── 左侧导航 ─────────────────────────────────────
        self.nav = QListWidget()
        self.nav.setFixedWidth(130)
        self.nav.setSpacing(2)
        self.nav.setIconSize(QSize(18, 18))
        self.nav.setStyleSheet("""
            QListWidget { border:none; outline:none; padding:8px 4px; }
            QListWidget::item { height:36px; border-radius:6px;
                                padding-left:10px; font-size:13px; }
            QListWidget::item:selected { background:#4a9eff; color:white; }
            QListWidget::item:hover:!selected { background:rgba(128,128,128,40); }
        """)

        pages = [
            ("fa5s.paint-brush",  "外观"),
            ("fa5s.window-maximize", "窗口"),
            ("fa5s.rocket",       "启动"),
            ("fa5s.folder-open",  "缓存"),
            ("fa5s.heart",        "捐赠"),
            ("fa5s.info-circle",  "关于"),
            ("fa5s.eraser",       "初始化"),
        ]
        self._nav_ready = False
        self._block_nav = False
        for icon_name, label in pages:
            try:
                icon = qta.icon(icon_name, color="#888")
                item = QListWidgetItem(icon, label)
            except Exception:
                # 防止图标名不存在导致设置页直接报错
                icon = qta.icon("fa5s.rocket", color="#888")
                item = QListWidgetItem(icon, label)
            if label == "初始化":
                item.setData(Qt.ItemDataRole.UserRole, "init")
            self.nav.addItem(item)
        self.nav.setCurrentRow(0)
        self.nav.currentRowChanged.connect(self._on_nav)

        # ── 右侧内容区 ───────────────────────────────────
        self.stack = QStackedWidget()
        self.stack.addWidget(self._page_appearance())
        self.stack.addWidget(self._page_window())
        self.stack.addWidget(self._page_startup())
        self.stack.addWidget(self._page_cache())
        self.stack.addWidget(self._page_donate())
        self.stack.addWidget(self._page_about())
        self.stack.addWidget(self._page_initialization())
        # 此时 stack 已就绪，允许导航回调正常工作
        self._nav_ready = True
        self._last_nav_index = self.nav.currentRow()
        self.stack.setCurrentIndex(self._last_nav_index)

        # 分割线
        line = QFrame()
        line.setFrameShape(QFrame.Shape.VLine)
        line.setStyleSheet("color: rgba(128,128,128,40);")

        root.addWidget(self.nav)
        root.addWidget(line)
        root.addWidget(self.stack)

    # ── 外观页 ───────────────────────────────────────────
    def _page_appearance(self) -> QWidget:
        page = QWidget()
        layout = QVBoxLayout(page)
        layout.setContentsMargins(24, 20, 24, 20)
        layout.setSpacing(20)

        layout.addWidget(self._section_title("主题"))

        theme_row = QHBoxLayout()
        theme_row.setSpacing(12)

        self._dark_btn = self._theme_card("🌙  暗色", "dark")
        self._light_btn = self._theme_card("☀️  亮色", "light")
        self._dark_btn.clicked.connect(lambda: self._set_theme("dark"))
        self._light_btn.clicked.connect(lambda: self._set_theme("light"))
        theme_row.addWidget(self._dark_btn)
        theme_row.addWidget(self._light_btn)
        theme_row.addStretch()
        layout.addLayout(theme_row)
        self._update_theme_cards()

        layout.addWidget(self._divider())
        layout.addWidget(self._section_title("透明度"))

        opacity_row = QHBoxLayout()
        opacity_row.setSpacing(12)
        self._opacity_slider = QSlider(Qt.Orientation.Horizontal)
        self._opacity_slider.setRange(30, 100)
        saved = int(database.get_setting("panel_opacity", "100"))
        self._opacity_slider.setValue(saved)
        self._opacity_slider.setFixedWidth(220)
        self._opacity_val = QLabel(f"{saved}%")
        self._opacity_val.setFixedWidth(36)
        self._opacity_slider.valueChanged.connect(self._on_opacity)
        opacity_row.addWidget(self._opacity_slider)
        opacity_row.addWidget(self._opacity_val)
        opacity_row.addStretch()
        layout.addLayout(opacity_row)

        layout.addStretch()
        return page

    def _theme_card(self, text: str, theme_name: str) -> QPushButton:
        btn = QPushButton(text)
        btn.setFixedSize(110, 44)
        btn.setCheckable(True)
        btn.setProperty("theme_name", theme_name)
        return btn

    def _update_theme_cards(self):
        cur = theme.name()
        for btn in (self._dark_btn, self._light_btn):
            active = btn.property("theme_name") == cur
            btn.setChecked(active)
            if active:
                btn.setStyleSheet("""
                    QPushButton { background:#4a9eff; color:white;
                                  border-radius:8px; font-size:13px;
                                  border:2px solid #4a9eff; }
                """)
            else:
                t = theme.current()
                btn.setStyleSheet(f"""
                    QPushButton {{ background:{t['search_bg']}; color:{t['search_color']};
                                   border-radius:8px; font-size:13px;
                                   border:1px solid {t['search_border']}; }}
                    QPushButton:hover {{ border-color:#4a9eff; }}
                """)

    def _set_theme(self, name: str):
        theme.set_theme(name)
        self._panel._apply_theme()
        self._update_theme_cards()
        self._apply_theme()

    def _on_opacity(self, val: int):
        self._panel.setWindowOpacity(val / 100)
        self._opacity_val.setText(f"{val}%")
        database.set_setting("panel_opacity", str(val))

    # ── 窗口页 ───────────────────────────────────────────
    def _page_window(self) -> QWidget:
        page = QWidget()
        layout = QVBoxLayout(page)
        layout.setContentsMargins(24, 20, 24, 20)
        layout.setSpacing(16)

        layout.addWidget(self._section_title("窗口行为"))

        self._pin_check = QCheckBox("固定面板（置顶、不自动隐藏）")
        self._pin_check.setChecked(self._panel._pinned)
        self._pin_check.toggled.connect(self._on_pin)
        layout.addWidget(self._pin_check)

        layout.addWidget(self._divider())
        layout.addWidget(self._section_title("图标大小"))

        size_row = QHBoxLayout()
        size_row.setSpacing(12)
        size_lbl = QLabel("图标宽度：")
        self._icon_size_spin = QSpinBox()
        self._icon_size_spin.setRange(48, 120)
        self._icon_size_spin.setSingleStep(4)
        saved_size = int(database.get_setting("icon_width", "72"))
        self._icon_size_spin.setValue(saved_size)
        self._icon_size_spin.setSuffix(" px")
        self._icon_size_spin.setFixedWidth(90)
        apply_btn = QPushButton("应用")
        apply_btn.setFixedWidth(60)
        apply_btn.clicked.connect(self._on_icon_size)
        size_row.addWidget(size_lbl)
        size_row.addWidget(self._icon_size_spin)
        size_row.addWidget(apply_btn)
        size_row.addStretch()
        layout.addLayout(size_row)

        layout.addStretch()
        return page

    def _on_pin(self, checked: bool):
        self._panel._pinned = checked
        self._panel._sync_pin_dependent_ui()

    def _on_icon_size(self):
        val = self._icon_size_spin.value()
        database.set_setting("icon_width", str(val))
        # 通知所有 ItemWidget 更新尺寸
        from ui.flow_layout import ITEM_W
        import ui.flow_layout as fl
        fl.ITEM_W = val
        self._panel.refresh_groups()

    # ── 启动页 ───────────────────────────────────────────
    def _page_startup(self) -> QWidget:
        page = QWidget()
        layout = QVBoxLayout(page)
        layout.setContentsMargins(24, 20, 24, 20)
        layout.setSpacing(16)

        layout.addWidget(self._section_title("开机启动"))

        self._autostart_check = QCheckBox("开机自动启动")
        self._autostart_check.setChecked(self._is_autostart_enabled())
        self._autostart_check.toggled.connect(self._on_autostart)
        layout.addWidget(self._autostart_check)

        layout.addStretch()
        return page

    def _page_about(self) -> QWidget:
        page = QWidget()
        layout = QVBoxLayout(page)
        layout.setContentsMargins(24, 20, 24, 20)
        layout.setSpacing(16)

        layout.addWidget(self._section_title("关于"))

        about = QLabel(
            f"<b>{APP_NAME}</b>  v{__VERSION__}<br><br>"
            "整理你的桌面快捷方式，保持桌面干净。<br><br>"
            "快捷键：<b>Alt + `</b>  唤醒 / 隐藏主界面"
        )
        about.setStyleSheet("color:#888; font-size:12px; line-height:1.8;")
        about.setTextFormat(Qt.TextFormat.RichText)
        layout.addWidget(about)

        layout.addStretch()
        return page

    # ── 缓存页 ───────────────────────────────────────────
    def _page_cache(self) -> QWidget:
        page = QWidget()
        layout = QVBoxLayout(page)
        layout.setContentsMargins(24, 20, 24, 20)
        layout.setSpacing(16)

        layout.addWidget(self._section_title("缓存目录"))

        desc = QLabel("下载的免安装软件/安装包默认保存到该目录。")
        desc.setWordWrap(True)
        desc.setStyleSheet("color:#888; font-size:12px; line-height:1.6;")
        layout.addWidget(desc)

        row = QHBoxLayout()
        row.setSpacing(10)

        self._cache_path_edit = QLineEdit()
        self._cache_path_edit.setPlaceholderText("请选择缓存目录…")
        self._cache_path_edit.setText(database.get_setting("cache_dir", ""))

        browse = QPushButton("浏览…")
        browse.clicked.connect(self._choose_cache_dir)

        save = QPushButton("保存")
        save.clicked.connect(self._save_cache_dir)

        row.addWidget(self._cache_path_edit)
        row.addWidget(browse)
        row.addWidget(save)
        layout.addLayout(row)

        layout.addStretch()
        return page

    def _choose_cache_dir(self):
        cur = ""
        if hasattr(self, "_cache_path_edit"):
            cur = self._cache_path_edit.text().strip()
        start = cur if cur else os.path.expanduser("~")
        p = QFileDialog.getExistingDirectory(self, "选择缓存目录", start)
        if p:
            self._cache_path_edit.setText(p)

    def _save_cache_dir(self):
        p = self._cache_path_edit.text().strip() if hasattr(self, "_cache_path_edit") else ""
        if p and not os.path.isdir(p):
            dialog_style.warning(self, "无效目录", "选择的缓存目录不存在，请重新选择。")
            return
        database.set_setting("cache_dir", p)
        dialog_style.information(self, "已保存", "缓存目录已保存。")

    # ── 捐赠页 ───────────────────────────────────────────
    def _page_donate(self) -> QWidget:
        page = QWidget()
        layout = QVBoxLayout(page)
        layout.setContentsMargins(24, 20, 24, 20)
        layout.setSpacing(16)

        layout.addWidget(self._section_title("捐赠支持"))

        info = QLabel("如果你喜欢这个软件，欢迎通过二维码支持开发者持续优化与维护。你的鼓励会成为重要的动力。<br>感谢你的支持！")
        info.setWordWrap(True)
        info.setStyleSheet("font-size:14px; line-height:1.1; background:transparent;")
        layout.addWidget(info)

        layout.addWidget(self._divider())

        card = QFrame()
        card.setObjectName("donate_card")

        grid = QHBoxLayout(card)
        grid.setContentsMargins(14, 14, 14, 14)
        grid.setSpacing(18)
        grid.setAlignment(Qt.AlignmentFlag.AlignHCenter)

        donate_dir = os.path.join(
            os.path.dirname(os.path.dirname(__file__)), "assets", "imgs", "donate"
        )
        wx_path = os.path.join(donate_dir, "wx.jpg")
        zfb_path = os.path.join(donate_dir, "zfb.jpg")

        def _qr_column(img_path: str, caption: str) -> QVBoxLayout:
            col = QVBoxLayout()
            col.setContentsMargins(0, 0, 0, 0)
            col.setSpacing(8)

            img = QLabel()
            img.setFixedSize(170, 170)
            img.setAlignment(Qt.AlignmentFlag.AlignCenter)
            img.setStyleSheet("background:transparent; border-radius:12px;")

            pm = QPixmap(img_path)
            if not pm.isNull():
                img.setPixmap(
                    pm.scaled(
                        img.size(),
                        Qt.AspectRatioMode.KeepAspectRatio,
                        Qt.TransformationMode.SmoothTransformation,
                    )
                )

            img.setCursor(Qt.CursorShape.PointingHandCursor)
            img.setToolTip("点击放大")
            # 直接覆盖点击事件：点击二维码弹出大图
            img.mousePressEvent = (  # type: ignore[assignment]
                lambda e, p=img_path: self._open_donate_image(p)
            )

            cap = QLabel(caption)
            cap.setAlignment(Qt.AlignmentFlag.AlignCenter)
            cap.setStyleSheet("font-size:12px; font-weight:700; background:transparent;")

            col.addWidget(img)
            col.addWidget(cap)
            return col

        grid.addLayout(_qr_column(wx_path, "微信支持"))
        grid.addLayout(_qr_column(zfb_path, "支付宝支持"))
        layout.addWidget(card)

        # 供 _apply_theme 动态设置样式
        self._donate_card = card
        return page

    def _page_initialization(self) -> QWidget:
        page = QWidget()
        layout = QVBoxLayout(page)
        layout.setContentsMargins(24, 20, 24, 20)
        layout.setSpacing(16)

        layout.addWidget(self._section_title("初始化"))

        desc = QLabel(
            "点击左侧「初始化」页签后，将弹出确认提醒。\n"
            "确认后会清空所有分组和程序（不可撤销）。"
        )
        desc.setWordWrap(True)
        desc.setStyleSheet("color:#888; font-size:13px; line-height:1.6;")
        layout.addWidget(desc)

        self._init_status_lbl = QLabel("")
        self._init_status_lbl.setStyleSheet("font-size:12px; color:#f90;")
        layout.addWidget(self._init_status_lbl)
        layout.addStretch()

        return page

    def _open_donate_image(self, img_path: str):
        """点击二维码后的弹窗大图查看。"""
        t = theme.current()

        d = QDialog(self)
        d.setWindowTitle("二维码放大查看")
        d.setWindowFlags(Qt.WindowType.Dialog | Qt.WindowType.WindowCloseButtonHint)
        d.setFixedSize(800, 600)
        d.setStyleSheet(f"""
            QDialog {{
                background: {t['panel_bg']};
                border: 1px solid {t['panel_border']};
                border-radius: 10px;
                color: {t['search_color']};
            }}
        """)

        layout = QVBoxLayout(d)
        layout.setContentsMargins(14, 14, 14, 14)
        layout.setSpacing(0)

        lbl = QLabel()
        lbl.setAlignment(Qt.AlignmentFlag.AlignCenter)
        lbl.setStyleSheet("background:transparent;")
        lbl.setScaledContents(False)  # 不拉伸，保持等比
        pm = QPixmap(img_path)
        if not pm.isNull():
            # 适配框体：保持等比缩放（不会被拉伸）
            target_w = d.width() - 28
            target_h = d.height() - 28
            lbl.setPixmap(
                pm.scaled(
                    target_w,
                    target_h,
                    Qt.AspectRatioMode.KeepAspectRatio,
                    Qt.TransformationMode.SmoothTransformation,
                )
            )

        layout.addWidget(lbl)

        d.exec()

    def _is_autostart_enabled(self) -> bool:
        try:
            import winreg
            key = winreg.OpenKey(
                winreg.HKEY_CURRENT_USER,
                r"Software\Microsoft\Windows\CurrentVersion\Run",
                0, winreg.KEY_READ
            )
            winreg.QueryValueEx(key, "DesktopOrganizer")
            winreg.CloseKey(key)
            return True
        except Exception:
            return False

    def _on_autostart(self, checked: bool):
        from ui.dock import _set_autostart
        _set_autostart(checked)

    # ── 工具方法 ─────────────────────────────────────────
    def _section_title(self, text: str) -> QLabel:
        lbl = QLabel(text)
        lbl.setStyleSheet("font-size:14px; font-weight:bold;")
        return lbl

    def _divider(self) -> QFrame:
        line = QFrame()
        line.setFrameShape(QFrame.Shape.HLine)
        line.setStyleSheet("color: rgba(128,128,128,40);")
        return line

    def _on_nav(self, index: int):
        if self._block_nav:
            return

        if not getattr(self, "_nav_ready", False) or not hasattr(self, "stack"):
            return

        item = self.nav.item(index)
        is_init_tab = bool(item and item.data(Qt.ItemDataRole.UserRole) == "init")

        if not is_init_tab:
            self.stack.setCurrentIndex(index)
            self._last_nav_index = index
            return

        ret = dialog_style.question(
            self,
            "初始化",
            "提醒请谨慎操作！！！！！\n\n"
            "此操作会清空所有分组和程序，且无法撤销。是否继续？",
            icon=QMessageBox.Icon.Warning,
        )
        if ret == QMessageBox.StandardButton.Yes:
            try:
                self._panel.reset_groups_and_items()
            except Exception as e:
                # 初始化失败也要尽量让用户知道原因
                dialog_style.warning(self, "初始化失败", f"清空数据失败：{e}")
                # 初始化失败则回退到上一个页签
                self._block_nav = True
                self.nav.setCurrentRow(self._last_nav_index)
                self._block_nav = False
                self.stack.setCurrentIndex(self._last_nav_index)
                return

            if hasattr(self, "_init_status_lbl"):
                self._init_status_lbl.setText("已完成初始化（分组和程序已清空）。")

            self.stack.setCurrentIndex(index)
            self._last_nav_index = index
        else:
            # 用户取消：回退到上一个页签
            self._block_nav = True
            self.nav.setCurrentRow(self._last_nav_index)
            self._block_nav = False
            self.stack.setCurrentIndex(self._last_nav_index)

    def _apply_theme(self):
        t = theme.current()
        is_dark = theme.name() == "dark"
        # 把 rgba(r,g,b,a) 转成 rgb(r,g,b)
        panel_bg = t["panel_bg"]
        if panel_bg.startswith("rgba"):
            tmp = panel_bg.replace("rgba", "rgb")
            # "rgb(r,g,b,a)" -> 取前三项 "rgb(r,g,b"
            head = tmp.rsplit(",", 1)[0]
            panel_rgb = head + ")"
        else:
            panel_rgb = panel_bg
        self.setStyleSheet(f"""
            QDialog, QWidget {{
                background: {panel_rgb};
                color: {t['search_color']};
            }}
            QListWidget {{
                background: {'rgba(0,0,0,30)' if is_dark else 'rgba(0,0,0,6)'};
            }}
            QSlider::groove:horizontal {{
                height:4px; background:{t['scrollbar']}; border-radius:2px;
            }}
            QSlider::handle:horizontal {{
                width:14px; height:14px; margin:-5px 0;
                background:#4a9eff; border-radius:7px;
            }}
            QSlider::sub-page:horizontal {{
                background:#4a9eff; border-radius:2px;
            }}
            QCheckBox {{ font-size:13px; spacing:8px; }}
            QCheckBox::indicator {{
                width:18px; height:18px; border-radius:4px;
                border:1px solid {t['search_border']};
                background:{t['search_bg']};
            }}
            QCheckBox::indicator:checked {{
                background:#4a9eff; border-color:#4a9eff;
                image: url(none);
            }}
            QSpinBox {{
                background:{t['search_bg']}; color:{t['search_color']};
                border:1px solid {t['search_border']}; border-radius:5px;
                padding:4px 8px; font-size:12px;
            }}
            QPushButton {{
                background:{t['search_bg']}; color:{t['search_color']};
                border:1px solid {t['search_border']}; border-radius:6px;
                padding:6px 14px; font-size:12px;
            }}
            QPushButton:hover {{ border-color:#4a9eff; color:#4a9eff; }}
        """)
        # 导航背景
        nav_bg = "rgba(0,0,0,30)" if is_dark else "rgba(0,0,0,6)"
        self.nav.setStyleSheet(f"""
            QListWidget {{ border:none; outline:none; padding:8px 4px;
                           background:{nav_bg}; }}
            QListWidget::item {{ height:36px; border-radius:6px;
                                 padding-left:10px; font-size:13px;
                                 color:{t['search_color']}; }}
            QListWidget::item:selected {{ background:#4a9eff; color:white; }}
            QListWidget::item:hover:!selected {{
                background:{'rgba(255,255,255,10)' if is_dark else 'rgba(0,0,0,6)'}; }}
        """)
        self._update_theme_cards()

        # 捐赠卡片样式
        if hasattr(self, "_donate_card"):
            card_bg = "rgba(0,0,0,25)" if is_dark else "rgba(255,255,255,10)"
            self._donate_card.setStyleSheet(f"""
                QFrame#donate_card {{
                    background:{card_bg};
                    border: 1px solid {t['panel_border']};
                    border-radius:14px;
                }}
            """)