#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Log display panel - collapsible log output area
"""

from datetime import datetime
from PyQt6.QtWidgets import (
    QWidget, QVBoxLayout, QHBoxLayout, QPlainTextEdit,
    QPushButton, QFrame, QLabel
)
from PyQt6.QtCore import Qt, pyqtSlot
from PyQt6.QtGui import QTextCursor

from .constants import LOG_MIN_HEIGHT, BUTTON_HEIGHT_SMALL, BUTTON_SPACING


class LogWidget(QWidget):
    """Log display panel"""

    def __init__(self, parent=None):
        super().__init__(parent)
        self.setObjectName("log_widget")
        self._collapsed = False
        self._max_lines = 500
        self._setup_ui()

    def _setup_ui(self):
        """Setup UI"""
        layout = QVBoxLayout(self)
        layout.setContentsMargins(0, 0, 0, 0)
        layout.setSpacing(0)

        # Header bar
        header = QFrame()
        header.setFixedHeight(36)
        header.setStyleSheet("background-color: rgba(0,0,0,0.03); border-bottom: 1px solid rgba(0,0,0,0.08);")
        header_layout = QHBoxLayout(header)
        header_layout.setContentsMargins(16, 0, 16, 0)
        header_layout.setSpacing(BUTTON_SPACING)

        # Title
        title = QLabel("📜 日志输出")
        title.setStyleSheet("font-weight: bold; font-size: 13px;")
        header_layout.addWidget(title)

        header_layout.addStretch()

        # Clear button
        self._clear_btn = QPushButton("清空")
        self._clear_btn.setFixedWidth(60)
        self._clear_btn.setFixedHeight(BUTTON_HEIGHT_SMALL)
        self._clear_btn.clicked.connect(self.clear)
        header_layout.addWidget(self._clear_btn)

        # Toggle button
        self._toggle_btn = QPushButton("▼")
        self._toggle_btn.setFixedWidth(36)
        self._toggle_btn.setFixedHeight(BUTTON_HEIGHT_SMALL)
        self._toggle_btn.clicked.connect(self._toggle_collapse)
        header_layout.addWidget(self._toggle_btn)

        layout.addWidget(header)

        # Log text area
        self._text_edit = QPlainTextEdit()
        self._text_edit.setReadOnly(True)
        self._text_edit.setMinimumHeight(LOG_MIN_HEIGHT)
        self._text_edit.setMaximumHeight(250)
        self._text_edit.setStyleSheet("""
            QPlainTextEdit {
                font-family: "Consolas", "Monaco", "Courier New", monospace;
                font-size: 12px;
                line-height: 1.5;
                padding: 8px 12px;
            }
        """)
        layout.addWidget(self._text_edit)

    def _toggle_collapse(self):
        """Toggle collapse state"""
        self._collapsed = not self._collapsed
        self._text_edit.setVisible(not self._collapsed)
        self._toggle_btn.setText("▲" if self._collapsed else "▼")

    @pyqtSlot(str)
    def append_log(self, message: str):
        """Append log message"""
        timestamp = datetime.now().strftime("%H:%M:%S")
        formatted = f"[{timestamp}] {message}"

        self._text_edit.appendPlainText(formatted)

        # Limit lines
        doc = self._text_edit.document()
        if doc.blockCount() > self._max_lines:
            cursor = QTextCursor(doc)
            cursor.movePosition(QTextCursor.MoveOperation.Start)
            cursor.select(QTextCursor.SelectionType.BlockUnderCursor)
            cursor.movePosition(
                QTextCursor.MoveOperation.Down,
                QTextCursor.MoveMode.KeepAnchor,
                doc.blockCount() - self._max_lines
            )
            cursor.removeSelectedText()

        # Scroll to bottom
        self._text_edit.moveCursor(QTextCursor.MoveOperation.End)

    def log(self, message: str):
        """Log alias"""
        self.append_log(message)

    def clear(self):
        """Clear log"""
        self._text_edit.clear()

    def get_text(self) -> str:
        """Get all log text"""
        return self._text_edit.toPlainText()