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from fastapi import FastAPI, File, UploadFile
from fastapi.responses import HTMLResponse
from fastapi.staticfiles import StaticFiles
import numpy as np
from PIL import Image
from io import BytesIO
import requests
import base64
import os

app = FastAPI()

# Mount the static folder for CSS and other assets
app.mount("/static", StaticFiles(directory="static"), name="static")

# Function for cropping and filling the image
def fill_square_cropper(img):
    imgsz = [img.height, img.width]
    avg_color_per_row = np.average(img, axis=0)
    avg_color = np.average(avg_color_per_row, axis=0)

    if img.height > img.width:
        newimg = Image.new(
            'RGB',
            (img.height, img.height),
            (round(avg_color[0]), round(avg_color[1]), round(avg_color[2]))
        )
        newpos = (img.height - img.width) // 2
        newimg.paste(img, (newpos, 0))
        return newimg

    elif img.width > img.height:
        newimg = Image.new(
            'RGB',
            (img.width, img.width),
            (round(avg_color[0]), round(avg_color[1]), round(avg_color[2]))
        )
        newpos = (img.width - img.height) // 2
        newimg.paste(img, (0, newpos))
        return newimg
    else:
        return img

# Home Page
@app.get("/", response_class=HTMLResponse)
def home_page():
    return """
    <html>
    <head>
        <link rel="stylesheet" href="/static/styles/style.css">
    </head>
    <body>
    <img src="/static/images/banner.jpg" alt="Banner" width="100%">
    <h2>Square and Fill Image App</h2>
    <p>Please select an option below:</p>
    <ul>
        <li><a href="/demo">Demo</a></li>
        <li><a href="/application">Application</a></li>
    </ul>
    </body>
    </html>
    """

# Demo Page
@app.get("/demo", response_class=HTMLResponse)
def demo_page():
    # URLs for demo images
    url1 = "https://raw.githubusercontent.com/webdevserv/images_video/main/cowportrait.jpg"
    url2 = "https://raw.githubusercontent.com/webdevserv/images_video/main/cowlandscape.jpg"

    # Process the first image
    response = requests.get(url1)
    img1 = Image.open(BytesIO(response.content)).convert("RGB")
    squared_img1 = fill_square_cropper(img1)
    output1 = BytesIO()
    squared_img1.save(output1, format="JPEG")
    encoded_img1 = base64.b64encode(output1.getvalue()).decode("utf-8")

    # Process the second image
    response = requests.get(url2)
    img2 = Image.open(BytesIO(response.content)).convert("RGB")
    squared_img2 = fill_square_cropper(img2)
    output2 = BytesIO()
    squared_img2.save(output2, format="JPEG")
    encoded_img2 = base64.b64encode(output2.getvalue()).decode("utf-8")

    return f"""
    <html>
    <body>
    <h2>Square Image Demo</h2>
    <p>Image will be squared with color filler where applicable.</p>
    <h3>Result 1:</h3>
    <img src="data:image/jpeg;base64,{encoded_img1}" />
    <h3>Result 2:</h3>
    <img src="data:image/jpeg;base64,{encoded_img2}" />
    <p><a href="/">Back</a></p>
    </body>
    </html>
    """

# Application Page
@app.get("/application", response_class=HTMLResponse)
def application_page():
    return """
    <html>
    <body>
    <img src="/static/images/banner.jpg" alt="Banner" width="100%">
    <h2>Square Image Application</h2>
    <p>Upload a JPG image to square and fill with color filler.</p>
    <form action="/upload/" enctype="multipart/form-data" method="post">
        <input name="file" type="file">
        <input type="submit" value="Square It">
    </form>
    <a href="/">Back</a>
    </body>
    </html>
    """

@app.post("/upload/")
async def upload_file(file: UploadFile = File(...)):
    try:
        # Await file upload
        contents = await file.read()
        img = Image.open(BytesIO(contents)).convert("RGB")
        squared_img = fill_square_cropper(img)

        # Save the squared image (original size)
        output = BytesIO()
        squared_img.save(output, format="JPEG")
        output.seek(0)

        # Encode the full-size image for download
        full_size_encoded_img = base64.b64encode(output.getvalue()).decode("utf-8")

        # Resize the image for display (512px by 512px)
        display_img = squared_img.copy()
        display_img.thumbnail((512, 512))  # Resize for display
        display_output = BytesIO()
        display_img.save(display_output, format="JPEG")
        display_output.seek(0)

        # Encode the resized display image
        display_encoded_img = base64.b64encode(display_output.getvalue()).decode("utf-8")

        # Return the HTML response
        return HTMLResponse(
            content=f"""
            <img src="/static/images/banner.jpg" alt="Banner" width="100%">
            <h2>Image successfully squared!</h2>
            <img src='data:image/jpeg;base64,{display_encoded_img}' width="512" height="512" />
            <br/>
            <a href="data:image/jpeg;base64,{full_size_encoded_img}" download="squared_image.jpg">
            View Full-Size Image
            </a>
            """,
            media_type="text/html"
        )
    except Exception as e:
        return HTMLResponse(content=f"<h3>An error occurred: {e}</h3>", media_type="text/html")

if __name__ == "__main__":
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=int(os.environ.get("PORT", 7860)))