# -*- coding: UTF-8 -*-
'''
@Project ：測(cè)試 
@File    ：test1.py
@IDE     ：PyCharm 
@Author  ：一晌小貪歡（278865463@qq.com）
@Date    ：2025/3/1 21:07 
'''

import sys
from PyQt5.QtWidgets import (QApplication, QWidget, QVBoxLayout, QPushButton,
                             QLabel, QLineEdit, QFileDialog, QHBoxLayout,
                             QCheckBox, QMessageBox, QSpacerItem, QSizePolicy)
from PyQt5.QtGui import QPixmap, QIntValidator, QDragEnterEvent, QDropEvent
from PyQt5.QtCore import Qt
from PIL import Image


class ResizeImageTool(QWidget):
    def __init__(self):
        super().__init__()
        self.width_connected = False
        self.height_connected = False
        self.preview_size = 400  # 預(yù)覽圖片的最大尺寸
        self.initUI()

    def initUI(self):
        self.setWindowTitle('圖片大小調(diào)整工具')
        self.setMinimumWidth(500)

        # 設(shè)置主布局
        self.layout = QVBoxLayout()
        self.layout.setSpacing(10)

        # 添加文件選擇區(qū)域
        file_layout = QHBoxLayout()
        self.selectBtn = QPushButton('選擇圖片', self)
        self.selectBtn.clicked.connect(self.selectImage)
        self.filePathLabel = QLabel('未選擇文件', self)
        file_layout.addWidget(self.selectBtn)
        file_layout.addWidget(self.filePathLabel)
        self.layout.addLayout(file_layout)

        # 顯示圖片的Label
        self.imageLabel = QLabel(self)
        self.imageLabel.setAlignment(Qt.AlignCenter)
        self.imageLabel.setMinimumHeight(self.preview_size)
        self.imageLabel.setAcceptDrops(True)  # 啟用拖放功能
        self.imageLabel.dragEnterEvent = self.dragEnterEvent
        self.imageLabel.dropEvent = self.dropEvent
        self.layout.addWidget(self.imageLabel)

        # 設(shè)置尺寸輸入?yún)^(qū)域
        size_layout = QHBoxLayout()

        # 寬度輸入
        width_layout = QVBoxLayout()
        self.widthLabel = QLabel('寬度：', self)
        self.widthInput = QLineEdit(self)
        self.widthInput.setValidator(QIntValidator(1, 9999))
        width_layout.addWidget(self.widthLabel)
        width_layout.addWidget(self.widthInput)

        # 高度輸入
        height_layout = QVBoxLayout()
        self.heightLabel = QLabel('高度：', self)
        self.heightInput = QLineEdit(self)
        self.heightInput.setValidator(QIntValidator(1, 9999))
        height_layout.addWidget(self.heightLabel)
        height_layout.addWidget(self.heightInput)

        size_layout.addLayout(width_layout)
        size_layout.addLayout(height_layout)
        self.layout.addLayout(size_layout)

        # 添加鎖定比例復(fù)選框
        self.lockAspectRatioCheckBox = QCheckBox('鎖定比例', self)
        self.lockAspectRatioCheckBox.setChecked(True)
        self.lockAspectRatioCheckBox.stateChanged.connect(self.onLockAspectRatioChanged)
        self.layout.addWidget(self.lockAspectRatioCheckBox)

        # 添加保存按鈕
        self.saveBtn = QPushButton('保存調(diào)整后的圖片', self)
        self.saveBtn.clicked.connect(self.saveImage)
        self.saveBtn.setEnabled(False)
        self.layout.addWidget(self.saveBtn)

        # 添加狀態(tài)標(biāo)簽
        self.statusLabel = QLabel('', self)
        self.statusLabel.setAlignment(Qt.AlignCenter)
        self.layout.addWidget(self.statusLabel)

        # 設(shè)置主窗口的布局
        self.setLayout(self.layout)

        # 初始化變量
        self.imagePath = None
        self.originalWidth = None
        self.originalHeight = None

        # 初始狀態(tài)下啟用鎖定比例
        self.onLockAspectRatioChanged(Qt.Checked)

    def dragEnterEvent(self, event: QDragEnterEvent):
        if event.mimeData().hasUrls():
            event.acceptProposedAction()

    def dropEvent(self, event: QDropEvent):
        if event.mimeData().hasUrls():
            filePath = event.mimeData().urls()[0].toLocalFile()
            if filePath.lower().endswith(('.png', '.jpg', '.jpeg', '.bmp')):
                self.loadImage(filePath)

    def loadImage(self, filePath):
        try:
            self.imagePath = filePath
            self.filePathLabel.setText(filePath)

            # 使用Pillow庫(kù)讀取圖片原始尺寸
            img = Image.open(filePath)
            self.originalWidth, self.originalHeight = img.size

            # 更新預(yù)覽圖片
            self.updatePreview()

            # 初始化輸入框
            self.widthInput.setText(str(self.originalWidth))
            self.heightInput.setText(str(self.originalHeight))

            # 啟用保存按鈕
            self.saveBtn.setEnabled(True)
            self.statusLabel.setText('圖片已加載')

        except Exception as e:
            QMessageBox.critical(self, '錯(cuò)誤', f'加載圖片時(shí)出錯(cuò)：{str(e)}')

    def selectImage(self):
        filePath, _ = QFileDialog.getOpenFileName(
            self, '選擇圖片', '',
            'Images (*.png *.xpm *.jpg *.jpeg *.bmp)'
        )
        if filePath:
            self.loadImage(filePath)

    def updatePreview(self):
        if not self.imagePath:
            return

        pixmap = QPixmap(self.imagePath)
        scaled_pixmap = pixmap.scaled(
            self.preview_size,
            self.preview_size,
            Qt.KeepAspectRatio,
            Qt.SmoothTransformation
        )
        self.imageLabel.setPixmap(scaled_pixmap)

    def onLockAspectRatioChanged(self, state):
        if state == Qt.Checked:
            if not self.width_connected:
                self.widthInput.textChanged.connect(self.updateHeightFromWidth)
                self.width_connected = True
            if not self.height_connected:
                self.heightInput.textChanged.connect(self.updateWidthFromHeight)
                self.height_connected = True
        else:
            if self.width_connected:
                self.widthInput.textChanged.disconnect(self.updateHeightFromWidth)
                self.width_connected = False
            if self.height_connected:
                self.heightInput.textChanged.disconnect(self.updateWidthFromHeight)
                self.height_connected = False

    def updateHeightFromWidth(self):
        if not self.originalWidth or not self.originalHeight:
            return

        try:
            if self.height_connected:
                self.heightInput.textChanged.disconnect(self.updateWidthFromHeight)

            width = int(self.widthInput.text() or 0)
            if width > 0:
                height = int((self.originalHeight / self.originalWidth) * width)
                self.heightInput.setText(str(height))

            if self.height_connected:
                self.heightInput.textChanged.connect(self.updateWidthFromHeight)
        except ValueError:
            pass

    def updateWidthFromHeight(self):
        if not self.originalWidth or not self.originalHeight:
            return

        try:
            if self.width_connected:
                self.widthInput.textChanged.disconnect(self.updateHeightFromWidth)

            height = int(self.heightInput.text() or 0)
            if height > 0:
                width = int((self.originalWidth / self.originalHeight) * height)
                self.widthInput.setText(str(width))

            if self.width_connected:
                self.widthInput.textChanged.connect(self.updateHeightFromWidth)
        except ValueError:
            pass

    def saveImage(self):
        if not self.imagePath:
            return

        try:
            width = int(self.widthInput.text())
            height = int(self.heightInput.text())

            if width <= 0 or height <= 0:
                raise ValueError("尺寸必須大于0")

            img = Image.open(self.imagePath)
            img = img.resize((width, height), Image.Resampling.LANCZOS)

            savePath, _ = QFileDialog.getSaveFileName(
                self, '保存圖片', '',
                'PNG (*.png);;JPEG (*.jpg *.jpeg);;BMP (*.bmp)'
            )

            if savePath:
                img.save(savePath)
                self.statusLabel.setText(f'圖片已保存到: {savePath}')
                QMessageBox.information(self, '成功', '圖片保存成功！')

        except ValueError as e:
            QMessageBox.warning(self, '警告', f"輸入錯(cuò)誤：{str(e)}")
        except Exception as e:
            QMessageBox.critical(self, '錯(cuò)誤', f"保存失敗：{str(e)}")


if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = ResizeImageTool()
    window.show()
    sys.exit(app.exec_())