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from enum import Enum
from pathlib import Path


class DemoType(Enum):
    GRADIO = 1
    STREAMLIT = 2


gradio_lite_html_template = Path('templates/gradio-lite/gradio-lite-template.html').read_text()
stlite_html_template = Path('templates/stlite/stlite-template.html').read_text()
gradio_lite_snippet_template = Path('templates/gradio-lite/gradio-lite-snippet-template.html').read_text()
stlite_snippet_template = Path('templates/stlite/stlite-snippet-template.html').read_text()


def starting_app_code(demo_type: DemoType) -> str:
    if demo_type == DemoType.GRADIO:
        return Path('templates/gradio-lite/gradio_lite_starting_code.py').read_text().replace('`', r'\`')
    elif demo_type == DemoType.STREAMLIT:
        return Path('templates/stlite/stlite_starting_code.py').read_text().replace('`', r'\`')
    raise NotImplementedError(f'{demo_type} is not a supported demo type')


def load_js(demo_type: DemoType) -> str:
    if demo_type == DemoType.GRADIO:
        return f"""() => {{
            if (window.gradioLiteLoaded) {{
                return
            }}
            const htmlString = '<iframe id="gradio-iframe" width="100%" height="512px" src="about:blank"></iframe>';
            const parser = new DOMParser();
            const doc = parser.parseFromString(htmlString, 'text/html');
            const iframe = doc.getElementById('gradio-iframe'); 
            const div = document.getElementById('gradioDemoDiv');
            div.appendChild(iframe);
    
            const template = `{gradio_lite_html_template.replace('STARTING_CODE', starting_app_code(demo_type))}`;
            const frame = document.getElementById('gradio-iframe');
            frame.contentWindow.document.open('text/html', 'replace');
            frame.contentWindow.document.write(template);
            frame.contentWindow.document.close();
            window.gradioLiteLoaded = true;
        }}"""
    elif demo_type == DemoType.STREAMLIT:
        return f"""() => {{
            if (window.stliteLoaded) {{
                return
            }}
            const htmlString = '<iframe id="stlite-iframe" width="100%" height="512px" src="about:blank"></iframe>';
            const parser = new DOMParser();
            const doc = parser.parseFromString(htmlString, 'text/html');
            const iframe = doc.getElementById('stlite-iframe'); 
            const div = document.getElementById('stliteDemoDiv');
            div.appendChild(iframe);
            
            const template = `{stlite_html_template.replace('STARTING_CODE', starting_app_code(demo_type))}`;            
            const frame = document.getElementById('stlite-iframe');
            frame.contentWindow.document.open();
            frame.contentWindow.document.write(template);
            frame.contentWindow.document.close();
            window.stliteLoaded = true;
        }}"""
    raise NotImplementedError(f'{demo_type} is not a supported demo type')


def update_iframe_js(demo_type: DemoType) -> str:
    # TODO: Theme changes are not picked up; look at options to refresh the css.
    if demo_type == DemoType.GRADIO:
        return f"""async (code) => {{       
                async function update() {{
                    const appController = document.getElementById('gradio-iframe').contentWindow.window.appController;
                    const newCode = code + ` # Update tag ${{Math.random()}}`;
                    appController.run_code(newCode);
                }};
                await update();
            }}"""
    elif demo_type == DemoType.STREAMLIT:
        return f"""async (code) => {{       
            async function update() {{
                const appController = document.getElementById('stlite-iframe').contentWindow.window.appController;
                const newCode = code + ` # Update tag ${{Math.random()}}`;
                const entrypointFile = "streamlit_app.py";
                appController.writeFile(entrypointFile, newCode);
            }};
            await update();
        }}"""
    raise NotImplementedError(f'{demo_type} is not a supported demo type')


def copy_snippet_js(demo_type: DemoType) -> str:
    if demo_type == DemoType.GRADIO:
        return f"""async (code) => {{
            const escapedCode = code.replace('`', String.fromCharCode(92) + '`');
            const template = `{gradio_lite_snippet_template}`;
            // Step 1: Generate the HTML content
            const completedTemplate = template.replace('STARTING_CODE', code);
    
            const snippet = completedTemplate;
            await navigator.clipboard.writeText(snippet);
        }}"""
    elif demo_type == DemoType.STREAMLIT:
        return f"""async (code) => {{
            const escapedCode = code.replace('`', String.fromCharCode(92) + '`');
            const template = `{stlite_snippet_template}`;
            // Step 1: Generate the HTML content
            const completedTemplate = template.replace('STARTING_CODE', code);
            
            const snippet = completedTemplate;            
            await navigator.clipboard.writeText(snippet);
        }}"""
    raise NotImplementedError(f'{demo_type} is not a supported demo type')


def download_code_js(demo_type: DemoType) -> str:
    if demo_type == demo_type.GRADIO:
        return f"""(code) => {{
            const escapedCode = code.replace('`', String.fromCharCode(92) + '`');
            // Step 1: Generate the HTML content
            const completedTemplate = `{gradio_lite_html_template}`.replace('STARTING_CODE', escapedCode);

            // Step 2: Create a Blob from the HTML content
            const blob = new Blob([completedTemplate], {{ type: "text/html" }});

            // Step 3: Create a URL for the Blob
            const url = URL.createObjectURL(blob);

            // Step 4: Create a download link
            const downloadLink = document.createElement("a");
            downloadLink.href = url;
            downloadLink.download = "gradio-lite-app.html"; // Specify the filename for the download

            // Step 5: Trigger a click event on the download link
            downloadLink.click();

            // Clean up by revoking the URL
            URL.revokeObjectURL(url);
        }}"""
    elif demo_type == demo_type.STREAMLIT:
        return f"""(code) => {{
            const escapedCode = code.replace('`', String.fromCharCode(92) + '`');
            // Step 1: Generate the HTML content
            const completedTemplate = `{stlite_html_template}`.replace('STARTING_CODE', escapedCode);
            
            // Step 2: Create a Blob from the HTML content
            const blob = new Blob([completedTemplate], {{ type: "text/html" }});
            
            // Step 3: Create a URL for the Blob
            const url = URL.createObjectURL(blob);
            
            // Step 4: Create a download link
            const downloadLink = document.createElement("a");
            downloadLink.href = url;
            downloadLink.download = "stlite-app.html"; // Specify the filename for the download
            
            // Step 5: Trigger a click event on the download link
            downloadLink.click();
            
            // Clean up by revoking the URL
            URL.revokeObjectURL(url);
        }}"""
    raise NotImplementedError(f'{demo_type} is not a supported demo type')