"""D&D Random Encounter Generator — native Gradio app (no iframe, no external frontend)."""

import gradio as gr

from src import content, tool
from src.space_config import CONFIG
from src.shared.ctas import cta_html, GENERATED_FLAG_JS
from src.shared.page import standard_launch
from src.shared.seo import (
    hero_html, section_html, faq_html, related_html, disclaimer_html,
)

COPY_JS = """
() => {
    const el = document.querySelector('#lf-copy-src textarea');
    if (!el || !el.value) return;
    const flash = () => {
        const btn = document.querySelector('#lf-copy-btn button') ||
                    document.querySelector('#lf-copy-btn');
        if (btn) { const t = btn.textContent; btn.textContent = 'Copied!';
                   setTimeout(() => (btn.textContent = t), 1500); }
    };
    const fallback = () => {
        el.focus({preventScroll: true}); el.select();
        try { document.execCommand('copy'); } catch (e) {}
        flash();
    };
    try {
        navigator.clipboard.writeText(el.value).then(flash).catch(fallback);
    } catch (e) { fallback(); }
}
"""


def on_generate(environment, level, size, flavor, difficulty, time_of_day, notes,
                request: gr.Request):
    md, plain, path, error = tool.generate(
        environment, level, size, flavor, difficulty, time_of_day, notes,
        request=request,
    )
    if error:
        return (
            gr.update(),                                  # markdown output unchanged
            gr.update(),                                  # copy source unchanged
            gr.update(),                                  # download unchanged
            gr.update(value=tool.render_error(error), visible=True),
            gr.update(visible=md is not None),            # actions row
        )
    return (
        gr.update(value=md, visible=True),
        gr.update(value=plain),
        gr.update(value=path, visible=True),
        gr.update(value="", visible=False),
        gr.update(visible=True),
    )


with gr.Blocks(title=CONFIG.title) as demo:
    gr.HTML(hero_html(CONFIG))
    gr.HTML(cta_html(CONFIG, CONFIG.hero_cta))

    with gr.Row(equal_height=False):
        with gr.Column(scale=5):
            environment = gr.Dropdown(tool.ENVIRONMENTS, label="Environment",
                                      value=None, allow_custom_value=True)
            with gr.Row():
                level = gr.Dropdown(tool.LEVELS, label="Party level", value=None)
                size = gr.Dropdown(tool.PARTY_SIZES, label="Party size", value=None)
            with gr.Row():
                flavor = gr.Dropdown(tool.FLAVORS, label="Encounter flavor",
                                     value=None)
                time_of_day = gr.Dropdown(tool.TIMES, label="Time of day",
                                          value=None)
            difficulty = gr.Radio(tool.DIFFICULTIES, label="Difficulty feel",
                                  value="Medium")
            notes = gr.Textbox(label="Anything else for the scribe (optional)", lines=2,
                               placeholder="Region details, a faction, or a creature to feature")
            with gr.Row():
                generate_btn = gr.Button("Roll Encounter", variant="primary",
                                         elem_classes=["lf-generate"])
                random_btn = gr.Button("Surprise Me")

        with gr.Column(scale=6):
            error_box = gr.HTML(visible=False)
            output_md = gr.Markdown(
                "*Your encounter will appear here — setup, creatures with counts and "
                "SRD stat blocks, motivation, terrain, complication, scaling notes, "
                "and a follow-up hook included.*",
                elem_classes=["lf-output", "lf-page"],
            )
            # Kept in the DOM (offscreen) so the Copy button's JS can read it;
            # visible=False would remove the textarea entirely in Gradio 6.
            copy_src = gr.Textbox(elem_id="lf-copy-src", elem_classes=["lf-offscreen"],
                                  container=False, show_label=False)
            with gr.Row(visible=False) as actions_row:
                copy_btn = gr.Button("Copy Markdown", elem_id="lf-copy-btn")
                download_btn = gr.DownloadButton("Download .md", visible=False)
                regen_btn = gr.Button("Roll Again")

    gr.HTML(cta_html(CONFIG, CONFIG.post_tool_cta))

    gr.HTML(section_html("Roll a Ready-to-Run Encounter", content.HOW_TO_HTML))
    gr.HTML(section_html("What Every Encounter Includes", content.INCLUDES_HTML))
    gr.HTML(section_html("Complete D&D Random Encounter Generator Example",
                         content.EXAMPLE_INTRO_HTML))
    gr.Markdown(tool.render_markdown(tool.FIXTURE_FALSE_LANTERNS),
                elem_classes=["lf-example", "lf-page"])
    gr.HTML(section_html("Making Random Encounters Feel Non-Random",
                         content.CRAFT_HTML))
    gr.HTML(faq_html(content.FAQS))
    gr.HTML(related_html(CONFIG))
    gr.HTML(cta_html(CONFIG, CONFIG.footer_cta))
    gr.HTML(disclaimer_html())

    inputs = [environment, level, size, flavor, difficulty, time_of_day, notes]
    outputs = [output_md, copy_src, download_btn, error_box, actions_row]

    for btn in (generate_btn, regen_btn):
        (
            btn.click(
                lambda: (gr.update(interactive=False), gr.update(interactive=False)),
                None, [generate_btn, regen_btn], api_name=False, queue=False,
            )
            .then(on_generate, inputs, outputs, api_name=False, concurrency_limit=1)
            .then(
                lambda: (gr.update(interactive=True), gr.update(interactive=True)),
                None, [generate_btn, regen_btn], api_name=False, queue=False,
            )
            .then(None, None, None, js=GENERATED_FLAG_JS, api_name=False, queue=False)
        )

    random_btn.click(tool.randomize, None, [environment, level, flavor, time_of_day],
                     api_name=False, queue=False)
    copy_btn.click(None, None, None, js=COPY_JS, api_name=False, queue=False)


if __name__ == "__main__":
    standard_launch(demo, CONFIG)