#!/usr/bin/python3

import pygame
from wobbl_tools import text
from typing import Union, Callable


pygame.init()

log = text.Log()

buttonlist = False
buttons = []

# colors
black = (8, 8, 8)
gray = (40, 40, 40)
light_gray = (128, 128, 128)
white = (250, 250, 250)

default_font = pygame.font.Font(pygame.font.get_default_font(), 16)


class Hover:
    """
    Used to execute a function when the mouse hovers over a rectangle.
    """
    def __init__(self, rect: pygame.Rect, function=None, args: tuple=None):
        self.rect = rect
        self.function = function
        self.args = args

        self.active = True

    def check(self, mouse_pos: tuple):
        if self.active:
            mx, my = mouse_pos

            if self.rect.collidepoint((mx, my)):
                if not self.function is None:
                    if self.args is None:
                        self.function()

                    else:
                        self.function(*self.args)

                return True

        return False


class Button:
    """
    Creates a button from a pygame.Rect.
    """
    def __init__(self, rect: pygame.Rect, function=None, args: tuple=None, key: int=0):  # key: 0 = left 1 = mouse wheel pressed 2 = right
        self.rect = rect
        self.function = function
        self.args = args
        self.key = key

        self.active = True

        self.hover = Hover(rect, function, args)

        if buttonlist:
            buttons.append(self)

    def check(self, mouse_pos: tuple, pressed):  # check if the button is pressed
        if self.active:
            if pressed[self.key]:
                return self.hover.check(mouse_pos)

        return False


class TextButton:
    """
    Creates a button from just some string and a position.
    """
    def __init__(self, text: str, position: tuple, function=None, args: tuple=None, key: int=0, text_color: tuple=white, bg_color: tuple=gray, font: pygame.font.Font=default_font, padding: tuple=(8, 8), border_radius: int=0, line_thickness: int = 0):
        self.text = text
        self.position = position
        self.text_color = text_color
        self.font = font
        self.function = function
        self.args = args
        self.key = key
        self.bg_color = bg_color
        self.padding = padding
        self.border_radius = border_radius
        self.line_thickness = line_thickness

        self.surface, self.size = self.generate_surface()
        self.rect = self.make_rect()

        self.button = Button(self.rect, self.function, args, self.key)

    def generate_surface(self):
        text_object = self.font.render(self.text, True, self.text_color)

        w, h = text_object.get_size()
        w, h = w + self.padding[0] * 2, h + self.padding[1] * 2

        surface = pygame.Surface((w, h), pygame.SRCALPHA)

        pygame.draw.rect(surface, self.bg_color, pygame.Rect((0, 0), (w, h)), self.line_thickness, self.border_radius)
        surface.blit(text_object, (self.padding[0], self.padding[1]))

        return surface, (w, h)

    def make_rect(self):
        return pygame.Rect(self.position, self.size)

    def draw(self, surface: pygame.Surface):
        surface.blit(self.surface, self.position)

    def check(self, mouse_pos, pressed):
        return self.button.check(mouse_pos, pressed)


# class HoverTitle:  # coming soon
#     def __init__(self, position: tuple=None, size: tuple=None, page: str=None, popup: str = None, collideable=None, delay: int=20):
#         self.x, self.y = position
#         self.width, self.height = size
#         self.page = page
#         self.popup = popup
#         self.collideable = collideable
#         self.delay = delay


class TextInput:
    """
    Creates an input object at a given position.
    """
    def __init__(
            self,
            position: Union[tuple, Callable],
            surface: pygame.Surface,
            width: int=None,
            font: pygame.font.Font=default_font,
            bg_color: tuple=(255, 255, 255),
            text_color: tuple=black,
            desc_text_color: tuple=light_gray,
            desc_text: str="",
            default_text: str="",
            padding: tuple=(8, 8),
            cursor_blink_interval: int=30,
            border_radius: int=-1,
            max_length: int=128
    ):
        self.surface = surface
        self.font = font
        self.bg_color = bg_color
        self.text_color = text_color
        self.desc_text_color = desc_text_color
        self.desc_text = desc_text
        self.text = default_text
        self.padding = padding
        self.focused = True
        self.cursor_blink_interval = cursor_blink_interval
        self.ticks_til_blink = cursor_blink_interval
        self.blink = False
        self.border_radius = border_radius
        self.max_length = max_length
        self.cursor_position = len(default_text)
        
        sx, sy = surface.get_size()
        
        if width is None:
            self.width = round(sx / 4)
            
        else:
            self.width = width
        
        self.description_text_object = font.render(self.desc_text, True, self.desc_text_color)
        self.text_object = font.render(self.text, True, self.text_color)
        self.text_blink_object = font.render(self.text + "|", True, self.text_color)

        self.height = self.text_object.get_height()

        if type(position) is tuple:
            self.position = position

        else:
            self.position = position(size=self.size)
            self.callable_position = position
        
        self.rect = self.generate_rect()

    def generate_rect(self):
        x, y = self.position
        px, py = self.padding
        x -= px
        y -= py

        return pygame.Rect((x, y), (self.width + px * 2, self.height + py * 2))

    def blit(self):
        pygame.draw.rect(self.surface, self.bg_color, self.rect, border_radius=self.border_radius)

        if self.focused:
            if self.blink:
                self.surface.blit(self.text_blink_object, self.position)

            else:
                self.surface.blit(self.text_object, self.position)

    def loop(self):
        """Call this function every tick to make the cursor blink."""

        self.ticks_til_blink -= 1

        if self.ticks_til_blink == -1:
            self.ticks_til_blink = self.cursor_blink_interval
            self.blink = not self.blink

    def keypress(self, event: pygame.event, pressed_keys, special_keys):
        """
        Call this function when a key is pressed to get user input like this:

        for event in pygame.event.get():
         if event.type == pygame.KEYDOWN:
          TextInput.keypress(event, pygame.key.get_pressed(), pygame.key.get_mods())
        """

        if self.max_length is None or len(self.text) <= self.max_length:
            key_unicode = event.unicode
            key = event.key

            if key < 32 or key > 101106 or special_keys & pygame.KMOD_CTRL or special_keys & pygame.KMOD_RCTRL or key > 126 and key < 161:
                if key == pygame.K_BACKSPACE:
                    if self.cursor_position > 0:
                        self.text = text.rsap(self.text, "", self.cursor_position - 1)
                        self.cursor_position -= 1

                elif key == pygame.K_LEFT:
                    if self.cursor_position > 0:
                        self.cursor_position -= 1

                elif key == pygame.K_RIGHT:
                    if self.cursor_position < len(self.text):
                        self.cursor_position += 1

            else:
                self.text = text.asap(self.text, key_unicode, self.cursor_position)
                self.cursor_position += 1

            self.regenerate_objects()

    def regenerate_objects(self):
        self.rect = self.generate_rect()

        self.text_object = self.font.render(self.text, True, self.text_color)
        self.text_blink_object = self.font.render(text.asap(self.text, "|", self.cursor_position), True, self.text_color)

        t_width, t_height = self.text_blink_object.get_size()

        if t_width > self.width:
            self.text_blink_object = crop_surface(self.text_blink_object, (t_width - (t_width - (t_width - self.width)), 0), (t_width - (t_width - self.width), t_height))
            self.text_object = crop_surface(self.text_object, (t_width - (t_width - (t_width - self.width)), 0), (t_width - (t_width - self.width), t_height))


class MultilineTextOld:
    """
    Early version of multiline text.
    Creates a surface with text on it.
    You can use a "\\n" to create a newline.
    When the max_width parameter is set, newlines generate automatically.
    When you know the width of the widest character in your font, yau can set the char_width parameter. It will make the text creation a bit faster.
    Use "surface.blit(multiline_text.surface, pos)" to draw it on a surface.
    """
    def __init__(self, text: str, font: pygame.font.Font=default_font, color: tuple=white, max_chars: int=None, max_width: int=None, char_width: int=None):
        self.text = text
        self.font = font
        self.color = color
        self.max_chars = max_chars

        if char_width is None:
            char_width = font.render(text, True, white).get_width() // len(text)  # get the width of a character by the font

        if max_chars is None and not max_width is None:
            self.max_width = max_width // char_width - 10

        self.surface = self.generate_surface()

    def generate_surface(self):
        lines = []
        line = ""

        length = 1

        if self.max_width is None:
            for char in self.text:
                if char == "\n":
                    lines.append(line)
                    length = 1
                    line = ""

                else:
                    line += char

                length += 1

        else:
            for char in self.text:
                if char == "\n" or len(line) + 1 > self.max_width:
                    lines.append(line)
                    length = 1

                    line = ""

                    if not char == "\n":
                        line = char

                else:
                    line += char

                length += 1

        lines.append(line)

        texts = []

        for line in lines:
            texts.append(self.font.render(line, True, self.color))

        w = max(texts, key=lambda t: t.get_width()).get_width()
        h = texts[0].get_height()
        sh = h * len(lines)

        surface = pygame.Surface((w, sh), flags=pygame.SRCALPHA)

        x, y = 0, 0

        for text in texts:
            surface.blit(text, (x, y))

            y += h

        return surface


class MultilineText:
    """
    Creates a surface with text on it.
    You can use a "\\n" to create a newline.
    When the max_width parameter is set, newlines generate automatically.
    When you know the width of the widest character in your font, yau can set the char_width parameter. It will make the text creation a bit faster.
    Use "surface.blit(multiline_text.surface, pos)" to draw it on a surface.
    """
    def __init__(self, text: str, font: pygame.font.Font=default_font, color: tuple=white, max_width: int=None):
        self.text = text
        self.font = font
        self.color = color
        self.max_width = max_width

        self.surface = self.generate_surface()

    def generate_surface(self):
        lines = []
        line = ""

        length = 1

        if self.max_width is None:
            for char in self.text:
                if char == "\n":
                    lines.append(line)
                    length = 1
                    line = ""

                else:
                    line += char

                length += 1

        else:
            for char in self.text:
                if char == "\n":
                    lines.append(line)

                    length = 1
                    line = ""

                elif self.font.size(line)[0] >= self.max_width - 8:
                    if " " in line:
                        # remove last word

                        words = line.split(" ")

                        last_word = words[len(words) - 1]
                        words.pop(len(words) - 1)

                        line = ""

                        for word in words:  # convert the list back to a string
                            line += word + " "

                        line = line[:len(line) - 1]  # remove last space character

                        lines.append(line)

                        line = last_word + char

                    else:
                        lines.append(line)

                        length = 1
                        line = char

                else:
                    line += char

                length += 1

        lines.append(line)

        texts = []

        for line in lines:
            texts.append(self.font.render(line, True, self.color))

        if self.max_width is None:
            w = max(texts, key=lambda t: t.get_width()).get_width()

        else:
            w = self.max_width

        h = texts[0].get_height()
        sh = h * len(lines)

        surface = pygame.Surface((w, sh), flags=pygame.SRCALPHA)

        x, y = 0, 0

        for text in texts:
            surface.blit(text, (x, y))

            y += h

        return surface


def set_rot_point(img, pos):
    """
    Blits the image on an  empty surface to change the center of rotation.
    """
    w, h = img.get_size()
    w, h = w * 2, h * 2

    img2 = pygame.Surface((w, h), pygame.SRCALPHA)
    img2.blit(img, (w / 2 - pos[0], h / 2 - pos[1]))
    return img2, (w, h)


def crop_surface(surface: pygame.Surface, position: tuple, size: tuple):
    new_surface = pygame.Surface(size, flags=pygame.SRCALPHA)

    x, y = position
    x = -x
    y = -y

    new_surface.blit(surface, (x, y))

    return new_surface


def check_buttons(mouse_pos, pressed):
    for button in buttons:
        button.check(mouse_pos, pressed)