import threading
from tkinter import *
from tkinter import ttk
from PIL import Image, ImageTk
from gesture_recognition import start_recognition, stop_recognition, release_camera, keep_running

WINDOW_WIDTH = 800
WINDOW_HEIGHT = 705


def main():
    show_welcome_screen()


def set_window_position(window, width, height):
    screen_width = window.winfo_screenwidth()
    screen_height = window.winfo_screenheight()
    x = (screen_width - width) // 2
    y = (screen_height - height) // 2
    window.geometry(f'{width}x{height}+{x}+{y}')


def show_welcome_screen():
    welcome = Tk()
    welcome.title("欢迎使用")
    set_window_position(welcome, WINDOW_WIDTH, WINDOW_HEIGHT)

    bg_image = Image.open("1.png")
    bg_image = bg_image.resize((WINDOW_WIDTH, WINDOW_HEIGHT), Image.Resampling.LANCZOS)
    bg_image = ImageTk.PhotoImage(bg_image)

    background_label = Label(welcome, image=bg_image)
    background_label.image = bg_image  # 保持引用，防止垃圾回收
    background_label.place(relwidth=1, relheight=1)

    label = Label(welcome, text="欢迎使用手势识别系统", font=('Helvetica', 24, 'bold'), bg="lightblue", fg="white")
    label.place(relx=0.5, rely=0.4, anchor=CENTER)

    btn_continue = Button(welcome, text="继续", command=lambda: [welcome.destroy(), show_main_screen()],
                          font=('Helvetica', 14), bg="yellow", fg="black", relief=SOLID)
    btn_continue.place(relx=0.5, rely=0.6, anchor=CENTER)

    welcome.mainloop()


def show_main_screen():
    global window, canvas
    window = Tk()
    window.title("手势识别")
    set_window_position(window, WINDOW_WIDTH, WINDOW_HEIGHT)
    style = ttk.Style(window)
    style.theme_use('clam')

    frame_controls = Frame(window, bg='lightgray', pady=10)
    frame_controls.pack(fill=X)

    frame_video = Frame(window, bg='white')
    frame_video.pack(fill=BOTH, expand=True)

    canvas = Canvas(frame_video, bg='black')
    canvas.pack(fill=BOTH, expand=True, padx=20, pady=20)

    status_label = Label(frame_controls, text="等待开始...", font=('Helvetica', 14), bg='lightgray')
    status_label.pack(side=LEFT, padx=(10, 20))

    btn_start = ttk.Button(frame_controls, text="开始", command=lambda: start_thread(window, canvas, status_label))
    btn_start.pack(side=LEFT, padx=10)

    btn_stop = ttk.Button(frame_controls, text="停止", command=lambda: stop_recognition_with_label(status_label))
    btn_stop.pack(side=LEFT, padx=10)

    btn_exit = ttk.Button(frame_controls, text="退出", command=lambda: exit_program())
    btn_exit.pack(side=LEFT, padx=10)

    style = ttk.Style(window)
    style.configure('TButton', font=('Helvetica', 14))

    window.mainloop()


def start_thread(root, canvas, status_label):
    global keep_running
    if not keep_running:
        status_label.config(text="正在识别...")
        threading.Thread(
            target=lambda: start_recognition(root, callback=lambda img: update_canvas(canvas, img))).start()


def stop_recognition_with_label(status_label):
    stop_recognition()
    status_label.config(text="已停止")


def exit_program():
    global window
    stop_recognition()
    release_camera()
    window.destroy()


def update_canvas(canvas, img):
    img = Image.fromarray(img)
    imgtk = ImageTk.PhotoImage(image=img)
    canvas.create_image(320, 240, image=imgtk)
    canvas.image = imgtk
    canvas.update()


if __name__ == "__main__":
    main()