from __future__ import annotations

import os
from pathlib import Path
from typing import Any

import gradio as gr

from src.config import ALL_CATEGORIES_LABEL, FAVORITES_ZIP_PATH, PROJECT_ROOT


APP_TITLE = "Visual Search | CLIP-based Image Retrieval System"
APP_NAME = "Visual Search"
APP_SUBTITLE = "Search semantically similar images with a text description or a reference image."

CSS_PATH = PROJECT_ROOT / "assets" / "custom.css"
FAVORITE_MODAL_JS_PATH = PROJECT_ROOT / "assets" / "favorite_modal.js"
ZIP_PATH = FAVORITES_ZIP_PATH

DEFAULT_TOP_K = 6
DEFAULT_CATEGORY_FILTER = ALL_CATEGORIES_LABEL
DEFAULT_MIN_SIMILARITY = 0.0
MAX_TOP_K = 20

TEXT_QUERY_EMPTY_PREVIEW = "Current query: no image description entered."
IMAGE_QUERY_EMPTY_PREVIEW = "Current query mode: image search\n\nImage uploaded: No"
NO_FAVORITES_STATUS = "No favorite images yet."

EXAMPLE_QUERIES = [
    "red apple",
    "banana",
    "milk bottle",
    "green vegetables",
    "bread",
    "tomato",
    "orange",
]

THEME = gr.themes.Soft(
    primary_hue="blue",
    neutral_hue="slate",
    radius_size="lg",
    spacing_size="lg",
)


def favorite_modal_head(js_path: Path = FAVORITE_MODAL_JS_PATH) -> str:
    script = js_path.read_text(encoding="utf-8")
    return f"<script>{script}</script>"


def gradio_launch_options() -> tuple[dict[str, Any], dict[str, Any]]:
    blocks_kwargs: dict[str, Any] = {"title": APP_TITLE, "fill_width": True}
    launch_kwargs: dict[str, Any] = {}
    head = favorite_modal_head()
    major_version = int(str(getattr(gr, "__version__", "0")).split(".", 1)[0])
    if major_version >= 6:
        launch_kwargs.update({"theme": THEME, "css_paths": CSS_PATH, "head": head})
    else:
        blocks_kwargs.update({"theme": THEME, "css_paths": CSS_PATH, "head": head})
    if os.getenv("SPACE_ID"):
        launch_kwargs["server_name"] = "0.0.0.0"
        try:
            launch_kwargs["server_port"] = int(os.getenv("PORT", "7860"))
        except ValueError:
            launch_kwargs["server_port"] = 7860
    return blocks_kwargs, launch_kwargs