from __future__ import annotations

import logging
import math
import os
import socket
import warnings
from pathlib import Path

os.environ.setdefault("GRADIO_ANALYTICS_ENABLED", "False")

import gradio as gr

from backend.recommender import browse_spaces, recommend_spaces, refresh_spaces
from backend.spaces_index import CATEGORY_ORDER, filter_public_spaces, get_category_distribution, get_index_stats, load_spaces
from backend.storage import (
    delete_feedback_comment,
    get_recent_feedback,
    init_db,
    save_feedback,
    update_feedback_comment,
)
from ui.cards import (
    COMMENTS_MODAL_HTML,
    COMMENTS_MODAL_SCRIPT,
    FIELD_GUIDE_SHELL_SCRIPT,
    render_category_section,
    render_footer_shell,
    render_page_shell,
    render_recommendation_cards,
)
from ui.styles import APP_CSS


logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)
logging.getLogger("httpx").setLevel(logging.WARNING)

warnings.filterwarnings("ignore", message=".*HTTP_422_UNPROCESSABLE_ENTITY.*")


CATEGORY_CHOICES = ["All"] + [category for category in CATEGORY_ORDER if category != "Other"] + ["Other"]
FEATURED_CATEGORIES = [
    "Security, Risk & Privacy",
    "Writing, Storytelling & Creativity",
    "Games, Puzzles & Interactive Fiction",
    "Education, Tutors & Learning",
    "Image, Art & Design",
    "Voice, Audio, Music & Speech",
    "Other",
]
RESULTS_PER_PAGE = 8
SEARCH_RESULT_LIMIT = 1000
PAGINATION_SLOTS = 7


def _format_stats(stats: dict) -> str:
    if not stats:
        return "**Index stats:** unavailable"

    def _format_stat_value(value: object) -> str:
        return "n/a" if value is None else str(value)

    category_counts = get_category_distribution()
    category_lines = [f"- {name}: {count}" for name, count in category_counts.items()]
    if not category_lines:
        category_lines = ["- No categories indexed yet"]

    return "\n".join(
        [
            "### Index stats",
            f"- Listed: {_format_stat_value(stats.get('listed', 0))}",
            f"- Private skipped: {_format_stat_value(stats.get('private_skipped', 0))}",
            f"- README fetched: {_format_stat_value(stats.get('readme_fetched', 0))}",
            f"- README missing: {_format_stat_value(stats.get('readme_missing', 0))}",
            "",
            "### Category distribution",
            *category_lines,
        ]
    )


def _render_stats() -> str:
    return _format_stats(get_index_stats())


def _render_stats_html() -> str:
    stats = get_index_stats()
    category_counts = get_category_distribution()

    def _display_value(value: object) -> str:
        return "n/a" if value is None else f"{int(value):,}"

    stat_rows = [
        ("Listed", stats.get("listed", 0), "📋", "stats-card__icon--listed"),
        ("README fetched", stats.get("readme_fetched", 0), "📖", "stats-card__icon--readme"),
        ("Private skipped", stats.get("private_skipped", 0), "🔒", "stats-card__icon--private"),
        ("README missing", stats.get("readme_missing", 0), "⚠️", "stats-card__icon--missing"),
    ]

    category_icons = {
        "Developer Tools & Code Assistants": "⌨️",
        "Productivity, Agents & Assistants": "🤖",
        "Voice, Audio, Music & Speech": "🎙️",
        "Image, Art & Design": "🎨",
        "Games, Puzzles & Interactive Fiction": "🎮",
        "Data, Research & Analysis": "📊",
        "Search, RAG & Knowledge Tools": "🔎",
        "Education, Tutors & Learning": "🎓",
        "Writing, Storytelling & Creativity": "✏️",
        "Community, Social & Collaboration": "👥",
        "Security, Risk & Privacy": "🛡️",
        "Science, Math & Engineering": "⚗️",
        "Health, Wellness & Accessibility": "🧡",
        "Other": "•••",
    }

    stat_html = "".join(
        f"""
        <article class="stats-card">
            <div class="stats-card__icon {icon_class}">{icon}</div>
            <div class="stats-card__label">{label}</div>
            <div class="stats-card__value">{_display_value(value)}</div>
        </article>
        """
        for label, value, icon, icon_class in stat_rows
    )
    category_html = "".join(
        f"""
        <article class="category-card">
            <div class="category-card__icon">{category_icons.get(name, '•••')}</div>
            <div class="category-card__label">{name}</div>
            <div class="category-card__value">{int(count):,}</div>
        </article>
        """
        for name, count in category_counts.items()
    )

    return f"""
    <section class="stats-showcase parchment-panel">
        <div class="stats-showcase__column stats-showcase__column--left">
            <div class="stats-showcase__title stats-showcase__title--decorated">Index stats</div>
            <div class="stats-cards-grid">{stat_html}</div>
        </div>
        <div class="stats-showcase__divider"></div>
        <div class="stats-showcase__column stats-showcase__column--right">
            <div class="stats-showcase__title">Category distribution</div>
            <div class="category-cards-grid">{category_html}</div>
        </div>
    </section>
    """


def _normalize_filter_text(value: str) -> str:
    return " ".join(str(value or "").lower().split())


def _filter_spaces_by_text(spaces: list[dict], filter_text: str) -> list[dict]:
    needle = _normalize_filter_text(filter_text)
    if not needle:
        return list(spaces)

    filtered: list[dict] = []
    for space in spaces:
        name = _normalize_filter_text(space.get("name", ""))
        if needle in name:
            filtered.append(space)
    return filtered


def _filtered_results_status(total: int, visible: int, filter_text: str) -> str:
    filter_text = (filter_text or "").strip()
    if not filter_text:
        return f"Found {visible} recommendation(s)."
    if visible == 0:
        return f'No spaces match "{filter_text}".'
    if visible == total:
        return f'Filter "{filter_text}" matches all {visible} space(s).'
    return f'Filtered to {visible} of {total} space(s) for "{filter_text}".'


def _render_filtered_results(
    results: list[dict],
    user_query: str,
    liked_text: str,
    filter_text: str,
    page: int,
):
    filtered_results = _filter_spaces_by_text(results, filter_text)
    cards_html, page_state, prev_update, page_updates, next_update, page_info, targets, total_pages = _render_results_view(
        filtered_results,
        user_query,
        liked_text,
        page,
    )
    status = _filtered_results_status(len(results), len(filtered_results), filter_text)
    return cards_html, filtered_results, status, page_state, prev_update, page_updates, next_update, page_info, targets, total_pages


def _render_filtered_results_bundle(
    results: list[dict],
    user_query: str,
    liked_text: str,
    filter_text: str,
    page: int,
):
    cards_html, filtered_results, status, page_state, prev_update, page_updates, next_update, page_info, targets, _ = _render_filtered_results(
        results,
        user_query,
        liked_text,
        filter_text,
        page,
    )
    return cards_html, filtered_results, status, page_state, prev_update, *page_updates, next_update, page_info, targets


def _render_browse(category: str) -> str:
    spaces = filter_public_spaces(browse_spaces(category or "All", limit=12))
    title = category if category and category != "All" else "All Spaces"
    header = (
        f"<div class='browse-header'><h3>Browse {title}</h3>"
        "<p>Spaces in the current index that fit this category.</p></div>"
    )
    return header + render_category_section(spaces, category or "All")


def _category_pill_defs() -> list[tuple[str, str, int]]:
    counts = get_category_distribution()
    stats = get_index_stats()
    total = int(stats.get("indexed_pool_size", 0) or sum(counts.values()))
    pills = [("All", "All", total)]
    pills.extend((name, name, int(counts.get(name, 0) or 0)) for name in CATEGORY_ORDER)
    return pills


def _category_pill_kwargs(selected_category: str) -> list[dict]:
    pills: list[dict] = []
    for name, label, count in _category_pill_defs():
        pills.append(
            {
                "value": label,
                "variant": "primary" if name == selected_category else "secondary",
                "elem_classes": ["category-pill-active"] if name == selected_category else ["category-pill"],
            }
        )
    return pills


def _category_pill_updates(selected_category: str) -> list[dict]:
    return [gr.update(**kwargs) for kwargs in _category_pill_kwargs(selected_category)]


def _total_pages(results: list[dict], page_size: int = RESULTS_PER_PAGE) -> int:
    return max(1, math.ceil(len(results) / max(1, page_size)))


def _slice_page(results: list[dict], page: int, page_size: int = RESULTS_PER_PAGE) -> tuple[list[dict], int]:
    total_pages = _total_pages(results, page_size)
    safe_page = max(1, min(int(page or 1), total_pages))
    start = (safe_page - 1) * page_size
    return results[start : start + page_size], total_pages


def _page_targets(page: int, total_pages: int, slots: int = PAGINATION_SLOTS) -> list[int | str | None]:
    if total_pages <= 0:
        return [None] * slots
    if total_pages <= slots:
        targets = list(range(1, total_pages + 1))
        targets.extend([None] * (slots - len(targets)))
        return targets

    if page <= 4:
        return [1, 2, 3, 4, 5, "...", total_pages]
    if page >= total_pages - 3:
        return [1, "...", total_pages - 4, total_pages - 3, total_pages - 2, total_pages - 1, total_pages]
    return [1, "...", page - 1, page, page + 1, "...", total_pages]


def _page_button_kwargs(target: int | str | None, current_page: int) -> dict:
    if target is None:
        return {
            "value": "",
            "visible": False,
            "interactive": False,
            "elem_classes": ["page-number"],
        }
    if target == "...":
        return {
            "value": "...",
            "visible": True,
            "interactive": False,
            "elem_classes": ["page-ellipsis"],
            "variant": "secondary",
        }
    return {
        "value": str(target),
        "visible": True,
        "interactive": True,
        "elem_classes": ["page-number-current"] if target == current_page else ["page-number"],
        "variant": "primary" if target == current_page else "secondary",
    }


def _page_button_state(target: int | str | None, current_page: int):
    return gr.update(**_page_button_kwargs(target, current_page))


def _resolve_page_target(targets: list[int | str | None] | None, idx: int, fallback: int) -> int:
    if not targets or idx >= len(targets):
        return fallback
    target = targets[idx]
    return target if isinstance(target, int) else fallback


def _pagination_updates(page: int, total_pages: int):
    targets = _page_targets(page, total_pages)
    prev_update = gr.update(interactive=page > 1, visible=True)
    next_update = gr.update(interactive=page < total_pages, visible=True)
    button_updates = [_page_button_state(target, page) for target in targets]
    page_info = ""
    return prev_update, button_updates, next_update, page_info, targets


def _render_results_view(
    results: list[dict],
    user_query: str,
    liked_text: str,
    page: int,
):
    show_reason = bool((user_query or "").strip() or (liked_text or "").strip())
    public_results = filter_public_spaces(results)
    page_items, total_pages = _slice_page(public_results, page)
    cards_html = render_recommendation_cards(
        page_items,
        show_reason=show_reason,
        source_query=(user_query or "").strip(),
    )
    prev_update, page_updates, next_update, page_info, targets = _pagination_updates(page, total_pages)
    page_state = max(1, min(int(page or 1), total_pages))
    return cards_html, page_state, prev_update, page_updates, next_update, page_info, targets, total_pages


def search_spaces(user_query: str, liked_text: str, category: str, top_k: int, filter_text: str = ""):
    safe_category = category or "All"
    results = recommend_spaces(
        user_query or "",
        liked_text or "",
        category=safe_category,
        top_k=SEARCH_RESULT_LIMIT,
    )
    browse_html = _render_browse(safe_category)
    category_note = "" if safe_category == "All" else f" in {safe_category}"
    base_status = "No strong match found for this query." if not results else f"Found {len(results)} recommendation(s){category_note}."
    rendered = _render_filtered_results_bundle(results, user_query or "", liked_text or "", filter_text or "", 1)
    return (
        render_page_shell(get_index_stats(), active_category=safe_category, active_query=user_query or ""),
        rendered[0],
        _render_stats_html(),
        browse_html,
        base_status,
        results,
        rendered[1],
        rendered[3],
        rendered[4],
        *rendered[5:12],
        rendered[12],
        rendered[13],
        rendered[14],
        safe_category,
        *_category_pill_updates(safe_category),
    )


def refresh_catalog(category: str, current_results: list[dict]):
    refresh_spaces()
    safe_category = category or "All"
    browse_html = _render_browse(safe_category)
    return render_page_shell(get_index_stats(), active_category=safe_category), _render_stats_html(), browse_html, "Index refreshed.", *_category_pill_updates(safe_category)


def load_homepage():
    return search_spaces("", "", "All", 8, "")


def change_result_page(results: list[dict], user_query: str, liked_text: str, page: int):
    cards_html, page_state, prev_update, page_updates, next_update, page_info, targets, _ = _render_results_view(
        results or [],
        user_query or "",
        liked_text or "",
        page,
    )
    status = f"Showing page {page_state}."
    return (
        cards_html,
        status,
        page_state,
        prev_update,
        *page_updates,
        next_update,
        page_info,
        targets,
    )


def _find_space(repo_id: str) -> dict | None:
    repo_id = (repo_id or "").strip()
    if not repo_id:
        return None
    try:
        for item in load_spaces(force=False):
            if str(item.get("id", "")).strip() == repo_id:
                return item
    except Exception:
        logger.exception("Could not load spaces while resolving comment target")
        return None
    return None


def _annotate_comments_for_owner(comments: list[dict], owner_session_id: str) -> list[dict]:
    owner_session_id = (owner_session_id or "").strip()
    annotated: list[dict] = []
    for comment in comments:
        row = dict(comment)
        row["can_edit"] = bool(owner_session_id and str(row.get("owner_session_id", "")).strip() == owner_session_id)
        annotated.append(row)
    return annotated


def _comment_payload(repo_id: str, owner_session_id: str = "") -> dict:
    comments = get_recent_feedback(limit=200, repo_id=repo_id)
    space = _find_space(repo_id)
    comments = _annotate_comments_for_owner(comments, owner_session_id)
    return {
        "ok": True,
        "repo_id": repo_id,
        "space_title": str((space or {}).get("name", "")),
        "count": len(comments),
        "comments": comments,
    }


def _save_repo_comment(repo_id: str, answer: str, source_query: str = "", owner_session_id: str = "") -> dict:
    repo_id = (repo_id or "").strip()
    answer = (answer or "").strip()
    source_query = (source_query or "").strip()
    owner_session_id = (owner_session_id or "").strip()

    if not repo_id:
        return {"ok": False, "detail": "Missing Space id.", "comments": [], "count": 0}
    if not answer:
        return {"ok": False, "detail": "Write a quick comment first.", "comments": [], "count": 0}
    if len(answer) > 1200:
        return {"ok": False, "detail": "Comment is too long. Keep it under 1200 characters.", "comments": [], "count": 0}

    space = _find_space(repo_id)
    if not space:
        return {"ok": False, "detail": "Could not find that Space in the current index.", "comments": [], "count": 0}

    save_feedback(
        repo_id=repo_id,
        space_title=str(space.get("name", "")),
        track=str(space.get("track", "")),
        question="Community comment",
        answer=answer,
        source_query=source_query,
        owner_session_id=owner_session_id,
    )
    return _comment_payload(repo_id, owner_session_id)


def _get_comments_api(repo_id: str, owner_session_id: str = "") -> dict:
    repo_id = (repo_id or "").strip()
    if not repo_id:
        return {"ok": False, "detail": "Missing Space id.", "comments": [], "count": 0}
    return _comment_payload(repo_id, owner_session_id)


def _save_comment_api(repo_id: str, answer: str, source_query: str = "", owner_session_id: str = "") -> dict:
    return _save_repo_comment(repo_id, answer, source_query, owner_session_id)


def _update_comment_api(repo_id: str, comment_id: int, answer: str, owner_session_id: str = "") -> dict:
    repo_id = (repo_id or "").strip()
    owner_session_id = (owner_session_id or "").strip()
    if not repo_id:
        return {"ok": False, "detail": "Missing Space id.", "comments": [], "count": 0}
    if not update_feedback_comment(comment_id, owner_session_id, answer):
        return {"ok": False, "detail": "Could not update comment.", "comments": [], "count": 0}
    return _comment_payload(repo_id, owner_session_id)


def _delete_comment_api(repo_id: str, comment_id: int, owner_session_id: str = "") -> dict:
    repo_id = (repo_id or "").strip()
    owner_session_id = (owner_session_id or "").strip()
    if not repo_id:
        return {"ok": False, "detail": "Missing Space id.", "comments": [], "count": 0}
    if not delete_feedback_comment(comment_id, owner_session_id):
        return {"ok": False, "detail": "Could not delete comment.", "comments": [], "count": 0}
    return _comment_payload(repo_id, owner_session_id)


def _recommend_button_update(query_text: str, liked_text: str):
    enabled = bool((query_text or "").strip() or (liked_text or "").strip())
    return gr.update(interactive=enabled)


def build_app():
    initial_category = "All"
    initial_results = recommend_spaces("", "", category=initial_category, top_k=SEARCH_RESULT_LIMIT)
    initial_cards, initial_page_state, initial_prev, initial_page_updates, initial_next, initial_page_info, initial_targets, initial_total_pages = _render_results_view(
        initial_results,
        "",
        "",
        1,
    )

    with gr.Blocks(title="Hugging Face Spaces Recommender", analytics_enabled=False) as demo:
        gr.api(
            _get_comments_api,
            api_name="comments_get",
            api_description=False,
            queue=False,
            api_visibility="undocumented",
        )
        gr.api(
            _save_comment_api,
            api_name="comments_save",
            api_description=False,
            queue=False,
            api_visibility="undocumented",
        )
        gr.api(
            _update_comment_api,
            api_name="comments_update",
            api_description=False,
            queue=False,
            api_visibility="undocumented",
        )
        gr.api(
            _delete_comment_api,
            api_name="comments_delete",
            api_description=False,
            queue=False,
            api_visibility="undocumented",
        )

        shell_html = gr.HTML(render_page_shell(get_index_stats(), active_category=initial_category), sanitize_html=False)

        gr.HTML(COMMENTS_MODAL_HTML, sanitize_html=False)

        stats_panel = gr.HTML(_render_stats_html(), sanitize_html=False)
        status_md = gr.Markdown("Ready.", elem_classes="status-line")
        base_results_state = gr.State(initial_results)
        results_state = gr.State(initial_results)
        page_state = gr.State(initial_page_state)
        page_targets_state = gr.State(initial_targets)
        category_state = gr.State(initial_category)

        with gr.Row(elem_classes="search-panels"):
            with gr.Column(scale=1, min_width=0):
                query = gr.Textbox(
                    label="What kind of Space are you looking for?",
                    placeholder="Example: kid-friendly app for learning with quizzes",
                    lines=2,
                    elem_id="search-query",
                    scale=1,
                )
            with gr.Column(scale=1, min_width=0):
                liked_text = gr.Textbox(
                    label="What did you like about another app? Optional.",
                    placeholder="Optional: magical UI, playful interaction, clear explanations, or anything else you want more of",
                    lines=2,
                    elem_id="liked-text",
                    scale=1,
                )

        with gr.Row(elem_classes="action-row"):
            recommend_btn = gr.Button("Recommend Spaces", variant="primary", elem_id="recommend-btn", interactive=False)

        with gr.Row(elem_classes="category-strip"):
            category_buttons = []
            for kwargs in _category_pill_kwargs(initial_category):
                category_buttons.append(gr.Button(**kwargs))

        with gr.Row(elem_classes="filter-row"):
            with gr.Column(scale=1, min_width=0):
                space_filter = gr.Textbox(
                    label="Filter these Spaces",
                    placeholder="Type to filter by space name",
                    lines=1,
                    max_lines=1,
                    elem_id="spaces-filter",
                    scale=1,
                )

        recommendations = gr.HTML(
            initial_cards,
            sanitize_html=False,
        )

        with gr.Row(elem_classes="pagination-shell"):
            prev_page_btn = gr.Button("< Prev", elem_classes="page-nav", interactive=bool(initial_page_state > 1))
            page_buttons = []
            for target in initial_targets:
                page_buttons.append(gr.Button(**_page_button_kwargs(target, initial_page_state)))
            next_page_btn = gr.Button("Next >", elem_classes="page-nav", interactive=bool(initial_page_state < initial_total_pages))
        page_info = gr.Markdown(initial_page_info, elem_classes="pagination-info")

        browse_html = gr.HTML(_render_browse("All"), sanitize_html=False, visible=False)

        gr.HTML(render_footer_shell(), sanitize_html=False)

        recommend_btn.click(
            lambda q, l, c, f: (gr.update(interactive=True), *search_spaces(q, l, c, 8, f)),
            inputs=[query, liked_text, category_state, space_filter],
            js="(q, l, c, f) => { window.bsqfDisableRecommendButton && window.bsqfDisableRecommendButton(); return [q, l, c, f]; }",
            outputs=[
                recommend_btn,
                shell_html,
                recommendations,
                stats_panel,
                browse_html,
                status_md,
                base_results_state,
                results_state,
                page_state,
                prev_page_btn,
                *page_buttons,
                next_page_btn,
                page_info,
                page_targets_state,
                category_state,
                *category_buttons,
            ],
        )
        query.change(
            _recommend_button_update,
            inputs=[query, liked_text],
            outputs=[recommend_btn],
        )
        liked_text.change(
            _recommend_button_update,
            inputs=[query, liked_text],
            outputs=[recommend_btn],
        )
        space_filter.input(
            lambda results, q, l, f: _render_filtered_results_bundle(results or [], q, l, f, 1),
            inputs=[base_results_state, query, liked_text, space_filter],
            outputs=[
                recommendations,
                results_state,
                status_md,
                page_state,
                prev_page_btn,
                *page_buttons,
                next_page_btn,
                page_info,
                page_targets_state,
            ],
        )
        space_filter.change(
            lambda results, q, l, f: _render_filtered_results_bundle(results or [], q, l, f, 1),
            inputs=[base_results_state, query, liked_text, space_filter],
            outputs=[
                recommendations,
                results_state,
                status_md,
                page_state,
                prev_page_btn,
                *page_buttons,
                next_page_btn,
                page_info,
                page_targets_state,
            ],
        )
        demo.load(
            lambda: search_spaces("", "", "All", 8, ""),
            outputs=[
                shell_html,
                recommendations,
                stats_panel,
                browse_html,
                status_md,
                base_results_state,
                results_state,
                page_state,
                prev_page_btn,
                *page_buttons,
                next_page_btn,
                page_info,
                page_targets_state,
                category_state,
                *category_buttons,
            ],
        )
        query.submit(
            lambda q, l, c, f: (gr.update(interactive=True), *search_spaces(q, l, c, 8, f)),
            inputs=[query, liked_text, category_state, space_filter],
            js="(q, l, c, f) => { window.bsqfDisableRecommendButton && window.bsqfDisableRecommendButton(); return [q, l, c, f]; }",
            outputs=[
                recommend_btn,
                shell_html,
                recommendations,
                stats_panel,
                browse_html,
                status_md,
                base_results_state,
                results_state,
                page_state,
                prev_page_btn,
                *page_buttons,
                next_page_btn,
                page_info,
                page_targets_state,
                category_state,
                *category_buttons,
            ],
        )
        prev_page_btn.click(
            lambda results, q, l, page: change_result_page(results, q, l, int(page or 1) - 1),
            inputs=[results_state, query, liked_text, page_state],
            outputs=[recommendations, status_md, page_state, prev_page_btn, *page_buttons, next_page_btn, page_info, page_targets_state],
        )
        next_page_btn.click(
            lambda results, q, l, page: change_result_page(results, q, l, int(page or 1) + 1),
            inputs=[results_state, query, liked_text, page_state],
            outputs=[recommendations, status_md, page_state, prev_page_btn, *page_buttons, next_page_btn, page_info, page_targets_state],
        )

        for index, button in enumerate(page_buttons):
            button.click(
                lambda results, q, l, targets, page, idx=index: change_result_page(
                    results,
                    q,
                    l,
                    _resolve_page_target(targets, idx, int(page or 1)),
                ),
                inputs=[results_state, query, liked_text, page_targets_state, page_state],
                outputs=[recommendations, status_md, page_state, prev_page_btn, *page_buttons, next_page_btn, page_info, page_targets_state],
            )

        for (category_name, _, _count), button in zip(_category_pill_defs(), category_buttons):
            button.click(
                lambda q, l, f, name=category_name: search_spaces(q, l, name, 8, f),
                inputs=[query, liked_text, space_filter],
                outputs=[
                    shell_html,
                    recommendations,
                    stats_panel,
                    browse_html,
                    status_md,
                    base_results_state,
                    results_state,
                    page_state,
                    prev_page_btn,
                    *page_buttons,
                    next_page_btn,
                    page_info,
                    page_targets_state,
                    category_state,
                    *category_buttons,
                ],
            )

    return demo


def _find_launch_port(preferred_port: int, max_tries: int = 10) -> int:
    start = max(1, int(preferred_port))
    for port in range(start, start + max_tries):
        with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as sock:
            sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
            try:
                sock.bind(("127.0.0.1", port))
            except OSError:
                continue
            return port
    return start


init_db()


if __name__ == "__main__":
    demo = build_app()
    launch_port = _find_launch_port(int(os.getenv("GRADIO_SERVER_PORT", "7860")))
    demo.launch(
        server_name="0.0.0.0",
        server_port=launch_port,
        css=APP_CSS,
        head=COMMENTS_MODAL_SCRIPT + FIELD_GUIDE_SHELL_SCRIPT,
        allowed_paths=[str(Path(__file__).resolve().parent)],
        ssr_mode=False,
        enable_monitoring=False,
    )