import tkinter as tk
from tkinter import filedialog as fd
from tkinter import ttk


class PlotType:
    USER = 1
    PRESET = 2
    POINT = 3


class PresetType:
    LINE = "ax + b = 0"
    PARABOLA = "ax^2 + bx + c = 0"
    
    @classmethod
    def options(cls):
        return [cls.LINE, cls.PARABOLA]


class PlotTypeFrame(tk.Frame):
    def __init__(self, master, plot_type_var, on_type_change):
        super().__init__(master)
        self.master = master
        self.plot_type = plot_type_var
        self.on_type_change = on_type_change
        
        self.create_widgets()

    def create_widgets(self):
        self.preset_plot = ttk.Radiobutton(self)
        self.preset_plot["variable"] = self.plot_type
        self.preset_plot["text"] = "Предустановленный"
        self.preset_plot["value"] = PlotType.PRESET
        self.preset_plot["command"] = self.on_type_change
        self.preset_plot.grid(row=0, column=0, sticky=tk.W)

        self.user_plot = ttk.Radiobutton(self)
        self.user_plot["variable"] = self.plot_type
        self.user_plot["text"] = "Пользовательский"
        self.user_plot["value"] = PlotType.USER
        self.user_plot["command"] = self.on_type_change
        self.user_plot.grid(row=1, column=0, sticky=tk.W)

        self.point_plot = ttk.Radiobutton(self)
        self.point_plot["variable"] = self.plot_type
        self.point_plot["text"] = "По точкам"
        self.point_plot["value"] = PlotType.POINT
        self.point_plot["command"] = self.on_type_change
        self.point_plot.grid(row=2, column=0, sticky=tk.W)

        self.preset_plot.invoke()


class PresetPlotFrame(tk.Frame):
    def __init__(self, master):
        super().__init__(master)
        self.master = master

        self.create_widgets()

    def create_widgets(self):
        #  Виджеты для указания значений параметров графиков
        self.variables = {}

        self.l_min = tk.Label(self)
        self.l_min["text"] = "min(x)"
        self.l_min.grid(row=1, column=0)

        self.min = tk.Entry(self)
        self.min.grid(row=1, column=1)
        
        self.l_max = tk.Label(self)
        self.l_max["text"] = "max(x)"
        self.l_max.grid(row=2, column=0)

        self.max = tk.Entry(self)
        self.max.grid(row=2, column=1)

        la = tk.Label(self)
        la["text"] = "a: "
        a = tk.Entry(self)

        lb = tk.Label(self)
        lb["text"] = "b: "
        b = tk.Entry(self)

        lc = tk.Label(self)
        lc["text"] = "c: "
        c = tk.Entry(self)
        
        #  В соответствие каждому графику ставятся виджеты его переменных.
        #  None соответствуют все виджеты переменных, чтобы их можно было
        #  скрывать.
        self.variables[PresetType.LINE] = [(la, a), (lb, b)]
        self.variables[PresetType.PARABOLA] = [(la, a), (lb, b), (lc, c)]
        self.variables[None] = [(la, a), (lb, b), (lc, c)]

        #  Изменения этой переменной будут передаваться в метод type_changed
        self.preset_type = tk.StringVar()
        self.preset_type.trace("w", self.type_changed)

        self.options = ttk.OptionMenu(
            self,
            self.preset_type,
            PresetType.options()[0],
            *PresetType.options(),
        )
        self.options.grid(row=0, column=0, columnspan=2, rowspan=1, sticky=tk.NSEW)

    def type_changed(self, *args):
        new_type = self.preset_type.get()
        
        for (label, var) in self.variables[None]:
            label.grid_forget()
            var.grid_forget()

        for i, (label, var) in enumerate(self.variables[new_type], 3):
            label.grid(row=i, column=0)
            var.grid(row=i, column=1)

    def grid_size(self):
        return (4, 2)

    def show(self):
        self.grid(row=0, column=0, columnspan=2, rowspan=4, sticky=tk.NSEW)
        self.grid_columnconfigure(0, weight=1)
        self.grid_columnconfigure(1, weight=4)

    def collect_info(self):
        # TODO: Добавить валидацию данных в этих полях.
        cur_type = self.preset_type.get()
        v = self.variables[cur_type]
        if cur_type == PresetType.PARABOLA:
            return {
                "status": "ok",
                "graph": "preset",
                "type": "parabola",
                "min": self.min.get(),
                "max": self.max.get(),
                "a": v[0][1].get(),
                "b": v[1][1].get(),
                "c": v[2][1].get()
            }
        elif cur_type == PresetType.LINE:
            return {
                "status": "ok",
                "graph": "preset",
                "type": "line",
                "min": self.min.get(),
                "max": self.max.get(),
                "a": v[0][1].get(),
                "b": v[1][1].get()
            }


class UserPlotFrame(tk.Frame):
    def __init__(self, master):
        super().__init__(master)
        self.master = master

        self.create_widgets()

    def create_widgets(self):
        pass

    def show(self):
        self.grid(row=0, column=0, columnspan=1, rowspan=2, sticky=tk.NSEW)

    def collect_info(self):
        return {"status": "ok"}


class PointPlotFrame(tk.Frame):
    def __init__(self, master):
        super().__init__(master)
        self.master = master
        
        self.show()
        self.create_widgets()
        self._path = ""

    def create_widgets(self):
        self.choose_file = tk.Button(self)
        self.choose_file["text"] = "Выбрать файл"
        self.choose_file["command"] = self.open_file
        self.choose_file.grid(row=0, column=0, columnspan=1, rowspan=1, padx=3, pady=3, sticky=tk.NSEW)
        
        self.filepath = tk.Entry(self)
        self.filepath.grid(row=1, column=0, sticky=tk.NSEW)

    def open_file(self):
        file_handle = tk.filedialog.askopenfile()
        if file_handle is not None:
            self._path = file_handle.name
            self.filepath.delete(0, tk.END)
            self.filepath.insert(0, file_handle.name)

    def show(self):
        gr, gc = (2, 1)
        self.grid(row=0, column=0, columnspan=gc, rowspan=gr, sticky=tk.NSEW)
        grid_conf(self, gr, gc)

    def collect_info(self):
        # TODO: Добавить обработку ошибок (нет файла, нельзя прочитать,
        # неправильный формат данных и т.д)
        with open(self._path) as f:
            data = f.read().strip().split()

        points = []
        for line in data:
            x, y = map(int, line.split(','))
            points.append((x, y))

        return {"status": "ok", "graph": "point", "points": points}


class App(tk.Frame):
    def __init__(self, master):
        super().__init__(master)

        self.grid(row=0, column=0, columnspan=2, rowspan=6, sticky=tk.NSEW)
        self.create_widgets()

    def create_widgets(self):
        #  Создаём фреймы с настройкой выбранного типа графика
        self.cfg_pt = {
            "row": 0, "column": 1, 
            "rowspan": 5, "columnspan": 1,
            "padx": 10, "pady": 10,
            "sticky": tk.NSEW
        }

        self.right_frame = ttk.LabelFrame(self)
        self.right_frame["text"] = "Настройка графика"
        self.right_frame.grid(**self.cfg_pt)
        grid_conf(self.right_frame, 5, 1)

        self.preset_plot_frame = PresetPlotFrame(self.right_frame)
        self.user_plot_frame = UserPlotFrame(self.right_frame)
        self.point_plot_frame = PointPlotFrame(self.right_frame)

        self.pw = {
            PlotType.PRESET: self.preset_plot_frame,
            PlotType.USER:   self.user_plot_frame,
            PlotType.POINT:  self.point_plot_frame,
        }

        #  Фрейм с выбором типа графика
        self.left_frame = ttk.LabelFrame(self)
        self.left_frame["text"] = "Тип графика"
        self.left_frame.grid(row=0, column=0, rowspan=5, columnspan=1, padx=10, pady=10, sticky=tk.NSEW)

        self.plot_type = tk.IntVar()

        self.w_plot_type = PlotTypeFrame(
            self.left_frame,
            self.plot_type, 
            self.change_plot_type
        )
        self.w_plot_type.grid(row=0, column=0, rowspan=5, padx=3, pady=3)

        #############################

        self.change_plot_type()

        self.submit_btn = tk.Button(self)
        self.submit_btn["text"] = "Построить график"
        self.submit_btn["command"] = self.submit
        self.submit_btn.grid(row=5, column=0, rowspan=1, columnspan=2, padx=10, pady=10, sticky=tk.NSEW)

    def change_plot_type(self):
        cur_type = self.plot_type.get()
        for ptype, widget in self.pw.items():
            if cur_type == ptype:
                widget.show()
            else:
                widget.grid_forget()

    def submit(self):
        cur_type = self.plot_type.get()
        widget = self.pw[cur_type]
        print(widget.collect_info())


def grid_conf(obj, rows, cols, uniform=False):
    for i in range(rows):
        obj.grid_rowconfigure(i, weight=1, uniform=uniform)
    for i in range(cols):
        obj.grid_columnconfigure(i, weight=1, uniform=uniform)


if __name__ == "__main__":
    root = tk.Tk()
    app = App(root)
    grid_conf(app, 6, 2)
    grid_conf(root, 6, 2)
    root.mainloop()