# -*- coding: utf-8 -*-
"""
文本输入模块
支持：
  - 控制台标准输入（后台线程读取，不阻塞 Qt 主循环）
  - 程序内直接注入（inject）
  - PyQt5 UI 文本框输入
"""

import logging
import sys

from PyQt5.QtCore import QThread, pyqtSlot, Qt
from PyQt5.QtWidgets import (
    QWidget, QVBoxLayout, QHBoxLayout,
    QLineEdit, QTextEdit, QPushButton, QLabel
)
from uas.io.base_io import BaseInput, IOType

logger = logging.getLogger(__name__)


# ─────────────────────────────────────────────────────────────────
# 控制台输入（后台 QThread 读取 stdin）
# ─────────────────────────────────────────────────────────────────

class _StdinReaderThread(QThread):
    def __init__(self, callback, parent=None):
        super().__init__(parent)
        self._callback = callback
        self._running  = False

    def run(self):
        self._running = True
        logger.info("stdin 读取线程启动")
        while self._running:
            try:
                line = sys.stdin.readline()
                if not line:
                    break
                text = line.rstrip("\n")
                if text:
                    self._callback(text)
            except Exception as e:
                logger.error(f"stdin 读取异常: {e}")
                break
        logger.info("stdin 读取线程退出")

    def stop(self):
        self._running = False


class ConsoleTextInput(BaseInput):
    """
    控制台文本输入
    在独立 QThread 中读取 stdin，通过信号槽安全回传主线程
    """

    def __init__(self, parent=None):
        super().__init__("console_stdin", IOType.TEXT, parent)
        self._thread = _StdinReaderThread(self._on_line_read, self)

    def start(self) -> None:
        self._running = True
        self._thread.start()
        logger.info("✅ ConsoleTextInput 已启动")

    def stop(self) -> None:
        self._running = False
        self._thread.stop()
        self._thread.wait(2000)
        logger.info("🛑 ConsoleTextInput 已停止")

    def _on_line_read(self, text: str):
        self._emit_input(text, metadata={"source": "stdin"})

    def inject(self, text: str) -> None:
        """程序内直接注入文本（用于测试或 API 调用）"""
        self._emit_input(text, metadata={"source": "inject"})


# ─────────────────────────────────────────────────────────────────
# PyQt5 UI 文本输入组件
# ─────────────────────────────────────────────────────────────────

class TextInputWidget(QWidget, BaseInput):
    """
    带 UI 界面的文本输入组件
    包含：单行输入框 + 多行文本框 + 发送按钮
    """

    def __init__(self, parent=None):
        QWidget.__init__(self, parent)
        BaseInput.__init__(self, "ui_text_input", IOType.TEXT)
        self._build_ui()

    def _build_ui(self):
        layout = QVBoxLayout(self)
        layout.setContentsMargins(8, 8, 8, 8)
        layout.setSpacing(6)

        # 标题
        title = QLabel("📝 文本输入")
        title.setStyleSheet("font-weight: bold; font-size: 13px;")
        layout.addWidget(title)

        # 多行输入区
        self._text_edit = QTextEdit()
        self._text_edit.setPlaceholderText("在此输入多行文本...")
        self._text_edit.setMinimumHeight(80)
        layout.addWidget(self._text_edit)

        # 单行 + 发送
        row = QHBoxLayout()
        self._line_edit = QLineEdit()
        self._line_edit.setPlaceholderText("快速输入（回车发送）...")
        self._line_edit.returnPressed.connect(self._on_send_line)
        row.addWidget(self._line_edit)

        self._send_btn = QPushButton("发送")
        self._send_btn.setFixedWidth(60)
        self._send_btn.clicked.connect(self._on_send_line)
        row.addWidget(self._send_btn)

        self._send_multi_btn = QPushButton("发送全文")
        self._send_multi_btn.setFixedWidth(70)
        self._send_multi_btn.clicked.connect(self._on_send_multi)
        row.addWidget(self._send_multi_btn)

        layout.addLayout(row)

        # 清空按钮
        clear_btn = QPushButton("清空")
        clear_btn.setFixedWidth(60)
        clear_btn.clicked.connect(self._text_edit.clear)
        layout.addWidget(clear_btn, alignment=Qt.AlignRight)

    @pyqtSlot()
    def _on_send_line(self):
        text = self._line_edit.text().strip()
        if text:
            self._emit_input(text, metadata={"source": "ui_line"})
            self._line_edit.clear()

    @pyqtSlot()
    def _on_send_multi(self):
        text = self._text_edit.toPlainText().strip()
        if text:
            self._emit_input(text, metadata={"source": "ui_multiline"})

    def start(self) -> None:
        self._running = True
        self.show()

    def stop(self) -> None:
        self._running = False