import gradio as gr
import logging
from config import CHAT_MODEL_SPECS, LING_1T, CODE_FRAMEWORK_SPECS, REACT_TAILWIND
from ui_components.model_selector import create_model_selector
from ui_components.code_framework_selector import create_code_framework_selector
from code_kit.agent_code_generator import code_generation_agent
from code_kit.agent_style_generator import generate_random_style
from code_kit.code_examples import CODE_EXAMPLES
from i18n import get_text

# Configure logging
logger = logging.getLogger(__name__)

def refresh_preview(code_type_display_name, current_code, chatbot_history, lang):
    """
    Refresh the preview and add a log entry.
    Refactored to rely solely on the HTML content for preview, assuming all frameworks
    produce a single-file HTML output that works in an iframe.
    """
    logger.info(f"--- [Manual Refresh] Start ---")
    logger.info(f"Code Type: {code_type_display_name}")
    
    # Simple validation: Check if code seems to be HTML
    if not current_code or not isinstance(current_code, str):
         chatbot_history.append({"role": "assistant", "content": get_text('code_log_no_code_warning', lang)})
         return gr.update(), chatbot_history

    # For all currently supported frameworks (Static, React+Tailwind, R3F, Old School), 
    # the output is a self-contained HTML string. 
    # So we can process them uniformly.
    escaped_code = current_code.replace("'", "'").replace('"', '"')
    final_preview_html = f"""
    <div style="width: 100%; height: 600px; border: 1px solid #ddd; overflow: hidden; position: relative; background-color: #f9f9f9;">
        <iframe srcdoc='{escaped_code}'
                style="position: absolute; top: 0; left: 0; width: 200%; height: 200%; transform: scale(0.5); transform-origin: 0 0; border: none;">
        </iframe>
    </div>
    """
    chatbot_history.append({"role": "assistant", "content": get_text('code_log_refreshed_state', lang)})
    logger.info("Refreshed preview.")
    return gr.HTML(final_preview_html), chatbot_history

def toggle_fullscreen(is_fullscreen, lang):
    logger.info(f"--- [Toggle Fullscreen] Called ---")
    logger.info(f"Current state before toggle: {is_fullscreen}")
    
    is_fullscreen = not is_fullscreen
    new_button_text = get_text('code_exit_fullscreen_button', lang) if is_fullscreen else get_text('code_fullscreen_button', lang)
    
    logger.info(f"New state: {is_fullscreen}")
    
    return (
        is_fullscreen, 
        gr.update(value=new_button_text)
    )

def log_js_error(error_text, chatbot_history, lang):
    """Appends a JavaScript error received from the frontend to the log chatbot."""
    if not error_text:
        return chatbot_history
        
    formatted_error = get_text('code_log_runtime_error', lang).format(error_text=error_text)
    
    # Check if the last message is the same error to prevent flooding
    if chatbot_history and chatbot_history[-1]["content"] == formatted_error:
        return chatbot_history

    chatbot_history.append({"role": "assistant", "content": formatted_error})
    return chatbot_history

def create_code_tab(initial_lang: str, current_lang_state: gr.State):
    gr.HTML("""<style>.hidden-component { display: none; }</style>""")
    fullscreen_state = gr.State(False)
    
    # JavaScript to dispatch a custom event for fullscreen toggle
    # Instead of relying on the potentially stale 'is_fullscreen' state passed from Python,
    # we check the actual DOM state of the panel to decide what to do.
    dispatch_fullscreen_event_js = """
    () => {
        const left = document.getElementById('left-panel');
        let isCurrentlyVisible = true;
        
        if (left) {
            // Check if hidden class is present or display is none
            // Note: We verify both class and inline style to be safe
            const isHidden = left.classList.contains('hidden-panel') || window.getComputedStyle(left).display === 'none';
            isCurrentlyVisible = !isHidden;
        }
        
        // Logic:
        // If panels are currently VISIBLE -> We want to enter Fullscreen (True)
        // If panels are currently HIDDEN  -> We want to exit Fullscreen (False)
        const targetState = isCurrentlyVisible;
        
        console.log("DOM Check - Panel Visible:", isCurrentlyVisible, "-> Target Fullscreen:", targetState);
        window.dispatchEvent(new CustomEvent('tab.code.toggleFullscreen', { detail: { isFullscreen: targetState } }));
        
        return targetState;
    }
    """
    
    with gr.Row(elem_id="indicator-code-tab"):
        with gr.Column(scale=1, visible=True, elem_id="left-panel") as left_panel:
            with gr.Column(scale=1): # Settings Panel    
                code_framework_dropdown = create_code_framework_selector(
                    framework_specs=CODE_FRAMEWORK_SPECS,
                    default_framework_constant=REACT_TAILWIND
                )
                model_choice_dropdown, model_description_markdown = create_model_selector(
                    model_specs=CHAT_MODEL_SPECS,
                    default_model_constant=LING_1T,
                    lang_state=current_lang_state,
                    initial_lang=initial_lang
                )
                prompt_input = gr.Textbox(lines=5, placeholder=get_text('code_prompt_placeholder', initial_lang), label=get_text('code_prompt_label', initial_lang))
                overall_style_input = gr.Textbox(label=get_text('code_overall_style_label', initial_lang), placeholder=get_text('code_overall_style_placeholder', initial_lang), lines=2)
                decoration_input = gr.Textbox(label=get_text('code_decoration_style_label', initial_lang), placeholder=get_text('code_decoration_style_placeholder', initial_lang), lines=2)
                palette_input = gr.Textbox(label="Palette (Raw)", elem_classes="hidden-component")
                palette_display = gr.HTML(value=f"<div style='color: #999; font-size: 12px;'>{get_text('code_palette_placeholder', initial_lang)}</div>", container=True, label=get_text('code_palette_label', initial_lang), show_label=True)
                generate_style_btn = gr.Button(get_text('code_generate_style_button', initial_lang), size="sm")
                with gr.Column():
                    examples_title = gr.Markdown(get_text('code_examples_title', initial_lang))
                    examples_dataset = gr.Dataset(
                        components=[gr.Textbox(visible=False)],
                        samples=[[item["task"]] for item in CODE_EXAMPLES],
                        label=get_text('code_examples_dataset_label', initial_lang),
                        headers=[get_text('code_examples_dataset_header', initial_lang)],
                    )
                generate_button = gr.Button(get_text('code_generate_code_button', initial_lang), variant="primary")

        with gr.Column(scale=4):
            with gr.Tabs(elem_id="result_tabs") as result_tabs:
                with gr.TabItem(get_text('code_preview_tab_title', initial_lang), id=0) as preview_tab:
                    with gr.Row():
                        preview_header = gr.Markdown(get_text('code_preview_header', initial_lang))
                        fullscreen_button = gr.Button(get_text('code_fullscreen_button', initial_lang), scale=0)
                    preview_output = gr.HTML(value=get_text('code_preview_placeholder', initial_lang))
                with gr.TabItem(get_text('code_source_code_tab_title', initial_lang), id=1) as source_code_tab:
                    source_code_header = gr.Markdown(get_text('code_source_code_header', initial_lang))
                    code_output = gr.Code(language="html", label=get_text('code_source_code_label', initial_lang), interactive=True)
                    refresh_button = gr.Button(get_text('code_refresh_preview_button', initial_lang))

        with gr.Column(scale=1, elem_id="right-panel") as right_panel:
            log_chatbot = gr.Chatbot(label=get_text('code_log_chatbot_label', initial_lang), height=300)
            js_error_channel = gr.Textbox(visible=True, elem_classes=["js_error_channel"], label=get_text('code_debug_channel_label', initial_lang), interactive=False)

    # Event Handler for Example Selection
    def on_select_example(evt: gr.SelectData):
        selected_task = evt.value[0]
        item = next((i for i in CODE_EXAMPLES if i["task"] == selected_task), None)
        if not item:
            return gr.update(), gr.update()
        
        return gr.update(value=item["user_prompt"]), gr.update(value=item["model"])

    examples_dataset.select(
        fn=on_select_example,
        inputs=None,
        outputs=[prompt_input, model_choice_dropdown],
        show_progress="hidden"
    )

    # Event Handler for Style Generation
    generate_style_btn.click(
        fn=generate_random_style,
        inputs=[model_choice_dropdown],
        outputs=[palette_display, palette_input, decoration_input, overall_style_input]
    )

    refresh_button.click(
        fn=refresh_preview,
        inputs=[code_framework_dropdown, code_output, log_chatbot, current_lang_state], 
        outputs=[preview_output, log_chatbot]
    )

    generate_button.click(
        fn=code_generation_agent,
        inputs=[
            code_framework_dropdown, 
            model_choice_dropdown, 
            prompt_input, 
            palette_input,       # Pass the raw palette string
            decoration_input, 
            overall_style_input,
            log_chatbot
        ],
        outputs=[code_output, preview_output, log_chatbot, result_tabs]
    )
    
    fullscreen_button.click(
        fn=toggle_fullscreen,
        inputs=[fullscreen_state, current_lang_state],
        outputs=[fullscreen_state, fullscreen_button],
        js=dispatch_fullscreen_event_js
    )

    js_error_channel.change(
        fn=log_js_error, 
        inputs=[js_error_channel, log_chatbot, current_lang_state],
        outputs=log_chatbot
    )

    return {
        "prompt_input": prompt_input, "overall_style_input": overall_style_input,
        "decoration_input": decoration_input, "palette_display": palette_display,
        "generate_style_btn": generate_style_btn, "examples_title": examples_title,
        "examples_dataset": examples_dataset, "generate_button": generate_button,
        "preview_tab": preview_tab, "preview_header": preview_header,
        "fullscreen_button": fullscreen_button, "preview_output": preview_output,
        "source_code_tab": source_code_tab, "source_code_header": source_code_header,
        "code_output": code_output, "refresh_button": refresh_button,
        "log_chatbot": log_chatbot, "js_error_channel": js_error_channel,
        "model_choice_dropdown": model_choice_dropdown,
        "model_description_markdown": model_description_markdown
    }

def update_language(lang: str, components: dict):
    return {
        components["prompt_input"]: gr.update(label=get_text('code_prompt_label', lang), placeholder=get_text('code_prompt_placeholder', lang)),
        components["overall_style_input"]: gr.update(label=get_text('code_overall_style_label', lang), placeholder=get_text('code_overall_style_placeholder', lang)),
        components["decoration_input"]: gr.update(label=get_text('code_decoration_style_label', lang), placeholder=get_text('code_decoration_style_placeholder', lang)),
        components["palette_display"]: gr.update(label=get_text('code_palette_label', lang)),
        components["generate_style_btn"]: gr.update(value=get_text('code_generate_style_button', lang)),
        components["examples_title"]: gr.update(value=get_text('code_examples_title', lang)),
        components["examples_dataset"]: gr.update(label=get_text('code_examples_dataset_label', lang), headers=[get_text('code_examples_dataset_header', lang)]),
        components["generate_button"]: gr.update(value=get_text('code_generate_code_button', lang)),
        components["preview_tab"]: gr.update(label=get_text('code_preview_tab_title', lang)),
        components["preview_header"]: gr.update(value=get_text('code_preview_header', lang)),
        # Fullscreen button is updated in its own event handler
        components["source_code_tab"]: gr.update(label=get_text('code_source_code_tab_title', lang)),
        components["source_code_header"]: gr.update(value=get_text('code_source_code_header', lang)),
        components["code_output"]: gr.update(label=get_text('code_source_code_label', lang)),
        components["refresh_button"]: gr.update(value=get_text('code_refresh_preview_button', lang)),
        components["log_chatbot"]: gr.update(label=get_text('code_log_chatbot_label', lang)),
        components["js_error_channel"]: gr.update(label=get_text('code_debug_channel_label', lang)),
    }