"""
命令片段管理对话框
"""
from PyQt5.QtCore import Qt
from PyQt5.QtWidgets import (
    QDialog, QVBoxLayout, QHBoxLayout, QTableWidget, QTableWidgetItem,
    QPushButton, QLabel, QLineEdit, QTextEdit, QMessageBox, QHeaderView,
    QAbstractItemView, QSplitter, QWidget, QFormLayout,
)

from core.snippets import SnippetManager


class SnippetDialog(QDialog):
    """单个片段的编辑/新增对话框"""

    def __init__(self, parent=None, name: str = "", cmd: str = ""):
        super().__init__(parent)
        self.setWindowTitle("编辑片段" if name else "新增片段")
        self.setMinimumWidth(460)
        v = QVBoxLayout(self)
        form = QFormLayout()
        self.name_edit = QLineEdit(name)
        self.name_edit.setPlaceholderText("如：查看端口占用")
        form.addRow("名称:", self.name_edit)
        self.cmd_edit = QTextEdit(cmd)
        self.cmd_edit.setPlaceholderText("如：ss -tlnp | grep :80")
        self.cmd_edit.setMaximumHeight(80)
        form.addRow("命令:", self.cmd_edit)
        v.addLayout(form)
        btns = QHBoxLayout()
        btns.addStretch(1)
        ok = QPushButton("保存")
        ok.clicked.connect(self._on_ok)
        cancel = QPushButton("取消")
        cancel.clicked.connect(self.reject)
        btns.addWidget(ok)
        btns.addWidget(cancel)
        v.addLayout(btns)

    def _on_ok(self):
        if not self.name_edit.text().strip():
            QMessageBox.warning(self, "提示", "请输入名称")
            return
        if not self.cmd_edit.toPlainText().strip():
            QMessageBox.warning(self, "提示", "请输入命令")
            return
        self.accept()

    def get_value(self) -> dict:
        return {
            "name": self.name_edit.text().strip(),
            "cmd": self.cmd_edit.toPlainText().strip(),
        }


class SnippetManagerDialog(QDialog):
    """片段管理主对话框：表格 + 增删改 + 上下移"""

    def __init__(self, mgr: SnippetManager, parent=None):
        super().__init__(parent)
        self.mgr = mgr
        self.setWindowTitle("命令片段管理")
        self.setMinimumSize(520, 420)
        self._build_ui()
        self._refresh_table()

    def _build_ui(self):
        v = QVBoxLayout(self)
        # 工具栏
        toolbar = QHBoxLayout()
        toolbar.addWidget(QLabel("📋 命令片段列表"))
        toolbar.addStretch(1)
        self.btn_add = QPushButton("➕ 新增")
        self.btn_add.clicked.connect(self._add)
        self.btn_edit = QPushButton("✏ 编辑")
        self.btn_edit.clicked.connect(self._edit)
        self.btn_del = QPushButton("🗑 删除")
        self.btn_del.clicked.connect(self._delete)
        self.btn_up = QPushButton("⬆ 上移")
        self.btn_up.clicked.connect(lambda: self._move(-1))
        self.btn_down = QPushButton("⬇ 下移")
        self.btn_down.clicked.connect(lambda: self._move(1))
        for b in (self.btn_add, self.btn_edit, self.btn_del, self.btn_up, self.btn_down):
            toolbar.addWidget(b)
        v.addLayout(toolbar)
        # 表格
        self.table = QTableWidget(0, 2)
        self.table.setHorizontalHeaderLabels(["名称", "命令"])
        self.table.horizontalHeader().setSectionResizeMode(0, QHeaderView.ResizeToContents)
        self.table.horizontalHeader().setSectionResizeMode(1, QHeaderView.Stretch)
        self.table.setSelectionBehavior(QAbstractItemView.SelectRows)
        self.table.setEditTriggers(QAbstractItemView.NoEditTriggers)
        self.table.doubleClicked.connect(self._edit)
        v.addWidget(self.table)
        # 关闭按钮
        btns = QHBoxLayout()
        btns.addStretch(1)
        close = QPushButton("关闭")
        close.clicked.connect(self.accept)
        btns.addWidget(close)
        v.addLayout(btns)

    def _refresh_table(self):
        snippets = self.mgr.list_all()
        self.table.setRowCount(len(snippets))
        for i, s in enumerate(snippets):
            self.table.setItem(i, 0, QTableWidgetItem(s["name"]))
            cmd_display = s["cmd"][:60] + ("..." if len(s["cmd"]) > 60 else "")
            self.table.setItem(i, 1, QTableWidgetItem(cmd_display))
            self.table.item(i, 0).setToolTip(s["cmd"])

    def _add(self):
        dlg = SnippetDialog(self)
        if dlg.exec_() == dlg.Accepted:
            v = dlg.get_value()
            self.mgr.add(v["name"], v["cmd"])
            self._refresh_table()

    def _edit(self):
        row = self.table.currentRow()
        if row < 0:
            return
        s = self.mgr.list_all()[row]
        dlg = SnippetDialog(self, s["name"], s["cmd"])
        if dlg.exec_() == dlg.Accepted:
            v = dlg.get_value()
            self.mgr.update(row, v["name"], v["cmd"])
            self._refresh_table()

    def _delete(self):
        row = self.table.currentRow()
        if row < 0:
            return
        s = self.mgr.list_all()[row]
        if QMessageBox.question(
            self, "确认删除", f"删除片段「{s['name']}」？",
            QMessageBox.Yes | QMessageBox.No
        ) == QMessageBox.Yes:
            self.mgr.remove(row)
            self._refresh_table()

    def _move(self, direction):
        row = self.table.currentRow()
        if row < 0:
            return
        self.mgr.move(row, direction)
        new_row = row + direction
        self._refresh_table()
        if 0 <= new_row < self.table.rowCount():
            self.table.selectRow(new_row)