import sys
import os
import shutil
from PIL import Image
from PyQt5.QtWidgets import (QApplication, QMainWindow, QWidget, QLabel, QPushButton,
                             QVBoxLayout, QHBoxLayout, QFileDialog, QSpinBox, QGroupBox,
                             QMessageBox)
from PyQt5.QtCore import Qt


class ImageSplitterApp(QMainWindow):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("圖片拆分工具")
        self.setFixedSize(450, 400)  # 稍微增大窗口以適應更多內(nèi)容

        # 獲取項目目錄作為默認輸出路徑
        self.project_dir = os.path.dirname(os.path.abspath(__file__))
        self.default_output_dir = os.path.join(self.project_dir, "split_results")
        self.output_dir = self.default_output_dir

        self.image_path = None
        self.original_filename = None

        self.init_ui()
        self.center_window()

    def center_window(self):
        """將窗口居中顯示在屏幕上"""
        screen = QApplication.primaryScreen().geometry()
        size = self.geometry()
        self.move(
            (screen.width() - size.width()) // 2,
            (screen.height() - size.height()) // 2
        )

    def init_ui(self):
        # 主部件和布局
        main_widget = QWidget()
        main_layout = QVBoxLayout()
        main_layout.setAlignment(Qt.AlignTop)

        # 圖片選擇區(qū)域
        img_group = QGroupBox("圖片選擇")
        img_layout = QVBoxLayout()

        self.img_label = QLabel("未選擇圖片")
        self.img_label.setWordWrap(True)
        img_btn = QPushButton("選擇圖片")
        img_btn.clicked.connect(self.select_image)

        img_layout.addWidget(self.img_label)
        img_layout.addWidget(img_btn)
        img_group.setLayout(img_layout)

        # 拆分設置區(qū)域
        split_group = QGroupBox("拆分設置")
        split_layout = QHBoxLayout()

        row_layout = QVBoxLayout()
        row_label = QLabel("行數(shù):")
        self.row_spin = QSpinBox()
        self.row_spin.setRange(1, 50)
        self.row_spin.setValue(2)
        row_layout.addWidget(row_label)
        row_layout.addWidget(self.row_spin)

        col_layout = QVBoxLayout()
        col_label = QLabel("列數(shù):")
        self.col_spin = QSpinBox()
        self.col_spin.setRange(1, 50)
        self.col_spin.setValue(2)
        col_layout.addWidget(col_label)
        col_layout.addWidget(self.col_spin)

        split_layout.addLayout(row_layout)
        split_layout.addLayout(col_layout)
        split_group.setLayout(split_layout)

        # 輸出信息區(qū)域
        output_group = QGroupBox("輸出設置")
        output_layout = QVBoxLayout()

        self.output_label = QLabel(f"輸出文件夾: {self.output_dir}")
        self.output_label.setWordWrap(True)

        output_btn = QPushButton("更改輸出文件夾")
        output_btn.clicked.connect(self.select_output_dir)

        output_layout.addWidget(self.output_label)
        output_layout.addWidget(output_btn)
        output_group.setLayout(output_layout)

        # 操作按鈕
        self.split_btn = QPushButton("拆分圖片")
        self.split_btn.setEnabled(False)
        self.split_btn.clicked.connect(self.split_image)
        self.split_btn.setMinimumHeight(40)  # 增大按鈕高度

        # 添加到主布局
        main_layout.addWidget(img_group)
        main_layout.addWidget(split_group)
        main_layout.addWidget(output_group)
        main_layout.addWidget(self.split_btn)

        main_widget.setLayout(main_layout)
        self.setCentralWidget(main_widget)

    def select_image(self):
        file_path, _ = QFileDialog.getOpenFileName(
            self, "選擇圖片", "",
            "圖片文件 (*.png *.jpg *.jpeg *.bmp *.gif)"
        )

        if file_path:
            self.image_path = file_path
            self.original_filename = os.path.basename(file_path)
            display_text = f"已選擇: {self.original_filename}"
            if len(display_text) > 40:
                display_text = f"已選擇: ...{self.original_filename[-30:]}"
            self.img_label.setText(display_text)
            self.split_btn.setEnabled(True)

    def select_output_dir(self):
        dir_path = QFileDialog.getExistingDirectory(
            self, "選擇輸出文件夾",
            self.project_dir  # 從項目目錄開始
        )

        if dir_path:
            self.output_dir = dir_path
            display_text = f"輸出文件夾: {dir_path}"
            if len(display_text) > 60:
                display_text = f"輸出文件夾: ...{dir_path[-50:]}"
            self.output_label.setText(display_text)

    def split_image(self):
        if not self.image_path:
            QMessageBox.warning(self, "警告", "請先選擇圖片!")
            return

        try:
            rows = self.row_spin.value()
            cols = self.col_spin.value()

            img = Image.open(self.image_path)
            img_width, img_height = img.size

            # 計算每個子圖的大小
            tile_width = img_width // cols
            tile_height = img_height // rows

            # 確保輸出目錄存在
            os.makedirs(self.output_dir, exist_ok=True)

            # 復制原始圖片到輸出目錄
            original_output_path = os.path.join(self.output_dir, self.original_filename)
            shutil.copy(self.image_path, original_output_path)

            # 拆分圖片并保存為 main_數(shù)字.png
            count = 1
            for i in range(rows):
                for j in range(cols):
                    left = j * tile_width
                    upper = i * tile_height
                    right = left + tile_width
                    lower = upper + tile_height

                    # 確保最后一塊包含剩余部分
                    if j == cols - 1:
                        right = img_width
                    if i == rows - 1:
                        lower = img_height

                    tile = img.crop((left, upper, right, lower))

                    # 生成文件名：main_數(shù)字.png
                    output_path = os.path.join(self.output_dir, f"main_{count}.png")
                    tile.save(output_path)
                    count += 1

            QMessageBox.information(
                self, "完成",
                f"圖片已拆分為 {rows}×{cols} = {count - 1} 個小圖!\n"
                f"保存到: {self.output_dir}\n\n"
                f"包含文件:\n"
                f"- 原始圖片: {self.original_filename}\n"
                f"- 拆分圖片: main_1.png 到 main_{count - 1}.png"
            )
        except Exception as e:
            QMessageBox.critical(self, "錯誤", f"處理圖片時出錯:\n{str(e)}")


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