import os.path
import threading
import tkinter as tk
from tkinter import ttk, filedialog, messagebox
from PIL import Image, ImageTk
import sv_ttk


class ImageApp:

    def __init__(self, root):
        self.image_path = None
        self.image_name = None
        self.root = root
        self.root.title("车牌识别")

        # 主布局为横向分割
        self.main_frame = ttk.Frame(root)
        self.main_frame.pack(fill='both', expand=True)

        self.left_frame = ttk.Frame(self.main_frame)
        self.left_frame.pack(side='left', fill='both', expand=True, padx=10, pady=10)

        self.right_frame = ttk.Frame(self.main_frame)
        self.right_frame.pack(
            side='right', fill='both', expand=True, padx=10, pady=10
        )

        self.open_button = ttk.Button(
            self.left_frame, text="选择图片", command=self.load_image
        )
        self.open_button.pack(anchor="n")

        self.origin_label = ttk.Label(self.left_frame, text="Origin Image")
        self.origin_label.pack(pady=5)

        self.origin_canvas = tk.Label(self.left_frame, borderwidth=2, relief="ridge")
        self.origin_canvas.pack(fill='both', expand=True)

        self.save_button = ttk.Button(
            self.right_frame, text="保存图片", command=self.save_image
        )
        self.save_button.pack(anchor="n")

        self.handle_label = ttk.Label(self.right_frame, text="Handle Image")
        self.handle_label.pack(pady=5)
        # ["raised", "sunken", "flat", "ridge", "solid", "groove"]
        self.handle_canvas = tk.Label(self.right_frame, borderwidth=2, relief="groove")
        self.handle_canvas.pack(fill='both', expand=True)

        self.origin_img = None
        self.handled_img = None
        self.tk_origin = None
        self.tk_handled = None

    def load_image(self):
        path = filedialog.askopenfilename(
            filetypes=[("Image files", "*.jpg *.png *.jpeg *.bmp *.gif")]
        )
        if path:
            self.origin_img = Image.open(path)
            width ,height = self.origin_canvas.winfo_width(), self.origin_canvas.winfo_height()
            print(width,height)
            self.tk_origin = ImageTk.PhotoImage(self.origin_img.resize((width , height)))
            self.origin_canvas.config(image=self.tk_origin)
            self.image_name = path.split("/")[-1]
            self.image_path = path


            threading.Thread(target=self.process_image, daemon=True).start()

    def handle_image(self):
        self.handled_img = self.origin_img.convert("L")
        width, height = (
            self.origin_canvas.winfo_width(),
            self.origin_canvas.winfo_height(),
        )

        self.tk_handled = ImageTk.PhotoImage(self.handled_img.resize((width , height )))
        self.handle_canvas.config(image=self.tk_handled)


    def process_image(self):
        # 耗时操作在线程中执行
        from detect_plate import start
        self.handle_label.config(text="Handle Image (正在识别中...)")
        start(self.image_path)
        cwd = os.getcwd()
        recognize_result_path = os.path.join("result", self.image_name)
        recognize_result_path = cwd + "\\" + recognize_result_path
        print(recognize_result_path)
        
        # 回到主线程更新 UI（Tkinter 所有 UI 更新必须在主线程）
        def update_ui():
            result = Image.open(recognize_result_path)
            self.handled_img = result
            width, height = (
                self.origin_canvas.winfo_width(),
                self.origin_canvas.winfo_height(),
            )

            self.tk_handled = ImageTk.PhotoImage(self.handled_img.resize((width, height)))
            self.handle_canvas.config(image=self.tk_handled)
            self.handle_label.config(text="Handle Image")

        self.root.after(0, update_ui)

    def save_image(self):
        if self.handled_img:
            save_path = filedialog.asksaveasfilename(
                title="保存图像",
                initialdir=os.path.expanduser("~/Downloads"),
                initialfile=self.image_name,
                defaultextension=".png",
                filetypes=[("PNG files", "*.png"), ("All files", "*.*")],
            )
            if save_path:
                self.handled_img.save(save_path)
                messagebox.showinfo("保存成功", f"图像已保存到：{save_path}")
        else:
            messagebox.showwarning("未处理图像", "请先选择图像再保存。")


def center_window(win, width, height):
    screen_width = win.winfo_screenwidth()
    screen_height = win.winfo_screenheight()
    x = (screen_width - width) // 2
    y = (screen_height - height) // 2
    win.geometry(f"{width}x{height}+{x}+{y}")


if __name__ == "__main__":
    root = tk.Tk()
    app = ImageApp(root)
    sv_ttk.set_theme("dark")
    center_window(root, 1600, 800   )
    root.mainloop()