from PIL import Image, ImageDraw, ImageFont, ImageEnhance
import textwrap, os       

BASE_WIDTH = 1200
IMPACT_FONT_FILE = os.path.join("fonts", "impact.ttf")
ARIAL_FONT_FILE = os.path.join("fonts", "opensans.ttf")

def _darken_image(image: Image, amount=0.5):
    return ImageEnhance.Brightness(image).enhance(amount)

def _draw_line(d: ImageDraw, x: int, y: int, line: str, font: ImageFont, letter_spacing: int = 9, fill = (255, 255, 255), stroke_width: int = 9, stroke_fill = (0, 0, 0)):
    
    for i in range(len(line)):
                d.text((x, y), line[i], fill=fill, stroke_width=stroke_width, font=font, stroke_fill=stroke_fill)
                x += font.getlength(line[i]) + letter_spacing

def tt_bt_effect(text: str, img: Image):
    LETTER_SPACING = 9
    LINE_SPACING = 10  
    FILL = (255, 255, 255)
    STROKE_WIDTH = 9
    STROKE_FILL = (0, 0, 0)
    FONT_BASE = 100
    MARGIN = 10
    
    def _draw_tt_bt(text, img, bottom=False):
        split_caption = textwrap.wrap(text.upper(), width=20)
        if split_caption == []:
            return
        font_size = FONT_BASE + 10 if len(split_caption) <= 1 else FONT_BASE
        font = ImageFont.truetype(font=IMPACT_FONT_FILE, size=font_size)
        img_width, img_height = img.size

        d = ImageDraw.Draw(img)
        txt_height = d.textbbox((0, 0), split_caption[0], font=font)[3]

        if bottom:
            factor = -1
            split_caption.reverse()
            y = (img_height - (img_height / MARGIN)) - (txt_height / 2)
        else:
            factor = 1
            y = (img_height / MARGIN) - (txt_height / 1.5)

        for line in split_caption:
            txt_width = d.textbbox((0, 0), line, font=font)[2]

            x = (img_width - txt_width - (len(line) * LETTER_SPACING))/2

            _draw_line(d, x, y, line, font, LETTER_SPACING, FILL, STROKE_WIDTH, STROKE_FILL)

            y += (txt_height + LINE_SPACING) * factor
    
    lines = [x for x in text.split("\n") if x]
    
    tt = lines[0] if len(lines) > 0 else None
    bt = lines[1] if len(lines) > 1 else None
    
    img = img.resize((BASE_WIDTH, int(img.size[1] * float(BASE_WIDTH / img.size[0]))))
    
    if tt is None and bt is None:
        return img
    
    if (tt is not None):
        _draw_tt_bt(tt, img)
    if (bt is not None):
        _draw_tt_bt(bt, img, bottom=True)
        
    img = img.resize((int(BASE_WIDTH/2), int(float(img.size[1]) * (BASE_WIDTH/2) / img.size[0])))
    
    if img.mode in ("RGBA", "P"):
        img = img.convert("RGB")
    
    return img

def splash_effect(text: str, img: Image):
    LETTER_SPACING = 1
    LINE_SPACING = 3  
    FILL = (255, 255, 255)
    STROKE_WIDTH = 1
    STROKE_FILL = (0, 0, 0)
    FONT_FIRST = 50
    FONT_BASE = 75
    MARGIN = 10
    LINE_WIDTH = 20
    
    def _draw_splash(text, img):
        font_first = ImageFont.truetype(font=ARIAL_FONT_FILE, size=FONT_FIRST)
        font_base = ImageFont.truetype(font=ARIAL_FONT_FILE, size=FONT_BASE)
        
        img_width, img_height = img.size

        d = ImageDraw.Draw(img)
        
        _, _, first_txt_width, first_txt_height = d.textbbox((0, 0), text[0], font=font_first)
        _, _, max_txt_width, txt_height = d.textbbox((0, 0), text[1], font=font_base)

        total_height = (txt_height + LINE_SPACING) * (len(text) - 1) + LINE_SPACING + first_txt_height
        y = (img_height - total_height) / 2
        
        for i in range(1, len(text)):
            #temp = d.textbbox((0, 0), text[i], font=font_base)[2]
            temp = int(font_base.getlength(text[i]))
            if temp > max_txt_width:
                max_txt_width = temp

        max_txt_width = max_txt_width if max_txt_width > first_txt_width else first_txt_width
        x_start = (img_width - max_txt_width) / 2
        
        for i in range(len(text)):
            line = text[i]
            x = x_start
            '''
            if align == "center":
                txt_width = d.textbbox((0, 0), line, font=font)[2]
                x = (img_width - txt_width - (len(line) * LETTER_SPACING))/2
            '''
            font = font_base if i > 0 else font_first
            _draw_line(d, x, y, line, font, LETTER_SPACING, FILL, STROKE_WIDTH, STROKE_FILL)

            y += (txt_height if i > 0 else first_txt_height) + LINE_SPACING
    
    lines = [x for x in text.split("\n") if x]
    if len(lines) < 2:
        return img
    
    img = img.resize((BASE_WIDTH, int(img.size[1] * float(BASE_WIDTH / img.size[0]))))
    
    img = _darken_image(img)
    
    split_text = textwrap.wrap(lines[1].upper(), width=LINE_WIDTH)
    if split_text == []:
        return
    split_text.insert(0, lines[0])
    _draw_splash(split_text, img)
        
    img = img.resize((int(BASE_WIDTH/2), int(float(img.size[1]) * (BASE_WIDTH/2) / img.size[0])))
    
    if img.mode in ("RGBA", "P"):
        img = img.convert("RGB")
    
    return img

def test_multiple(text, effect, modifier=""):
        imgs = os.listdir("test")
        for i in range(len(imgs)):
            image = effect(text, Image.open(os.path.join("test", imgs[i])))
            image.save(os.path.join("test_output", f'output{modifier}{i}.jpg'), optimize=True, quality=80)

        print("Image test successful")

def test(text, effect, modifier=""):
        image = effect(text, Image.open("image.jpg"))
        image.save('output.jpg', optimize=True, quality=80)

        print("Image test successful")

def main():
    #test("Autore\ntesto un po' più lungo ma non troppo eh\nquesto verrà scartato\npure questo", splash_effect)
    test_multiple("top text\nbottom text", splash_effect)
    test_multiple("top text top text top text top text top text\nbottom text bottom text bottom text bottom text bottom text", splash_effect, "_long")
    
if __name__ ==  "__main__":
    main()