#!/usr/bin/python3

import pygame
from wobbl_tools import pg


class GUI:
    def __init__(self, app):
        self.app = app

        self.buttons = {}

        self.example_menu = ExampleMenu(self)
        self.multiline_text_example = MultilineTextExample(self)

        self.current_page = "example_menu"

        self.pages = self.get_list_of_pages()

    def draw(self):
        page = getattr(self, self.current_page)
        page.draw()

    def update(self):
        for page_name in self.pages:
            page = getattr(self, page_name)
            page.update()

    def get_list_of_pages(self):
        pages = []

        for name, page in self.__dict__.items():
            if issubclass(type(page), Page):
                pages.append(name)

        return pages

    def reload(self):
        for page_name in self.pages:
            page = getattr(self, page_name)
            page.load()


class Page:
    def __init__(self, gui):
        self.gui = gui
        self.app = gui.app

        self.surface = pygame.Surface(self.app.screen.get_size(), flags=pygame.SRCALPHA)

        self.load()
        self.update()

    def draw(self):
        self.app.screen.blit(self.surface, (0, 0))

    def update(self):
        pass

    def load(self):
        pass


class ExampleMenu(Page):
    def load(self):
        button_texts = ["Multiline Text"]

        buttons = []

        for button_text in button_texts:
            name_lower = button_text.lower().replace(" ", "_")

            setattr(self, name_lower + "_button", len(buttons))

            buttons.append(pg.TextButton(button_text, (0, 0), change_page, (self, name_lower + "_example")))

        start_pos = (10, 10)
        spacing = 10

        x, y = start_pos

        i = 0

        for button in buttons:
            if x + button.surface.get_width() > self.app.screen.get_width():
                x = start_pos[0]
                y += button.surface.get_height() + spacing

                button.position = (x, y)

            else:
                button.position = (x, y)

            w, h = button.size

            button.rect = pygame.Rect((x, y), (w, h))
            button.button = pg.Button(button.rect, button.function, button.args, key=button.key)

            buttons[i] = button

            x += button.surface.get_width() + spacing

            i += 1

        self.gui.buttons["example_menu"] = buttons

    def update(self):
        self.surface.fill((20, 20, 20))

        for button in self.gui.buttons["example_menu"]:
            button.draw(self.surface)


class MultilineTextExample(Page):
    def load(self):
        self.heading = self.app.big_font.render("Multiline Text", True, pg.white)

        self.text = pg.MultilineText(
            "If you want to create multiple lines of text in pygame, " +
            "you have to create multiple text objects and blit them one another.\n" +
            'The class "MultilineText()" does this automatically. ' +
            'You can make new lines by adding "\\n" to the string. ' +
            "It can also automatically create newlines if the line is longer than a given length.\n" +
            "You can resize this window and the text will automatically fit on the window.",
            max_width=self.app.screen.get_width()
        )

    def update(self):
        self.surface = pygame.transform.scale(self.surface, self.app.screen.get_size())
        self.surface.fill((20, 20, 20))

        self.load()

        self.surface.blit(self.heading, (self.app.screen.get_width() / 2 - self.heading.get_width() / 2, 10))
        self.surface.blit(self.text.surface, (10, 50))


def change_page(self, page):
    self.gui.current_page = page