from __future__ import annotations

from pathlib import Path

from src.search_service import SearchResult
from src.ui.constants import (
    DEFAULT_CATEGORY_FILTER,
    DEFAULT_MIN_SIMILARITY,
    DEFAULT_TOP_K,
    IMAGE_QUERY_EMPTY_PREVIEW,
    TEXT_QUERY_EMPTY_PREVIEW,
)
from src.ui.types import FavoriteState, GalleryItem, ResultState


def initial_overview(
    top_k: int = DEFAULT_TOP_K,
    category_filter: str = DEFAULT_CATEGORY_FILTER,
    min_similarity: float = DEFAULT_MIN_SIMILARITY,
) -> str:
    return (
        "### Results Overview\n\n"
        "Enter a description or upload a reference image, then click **Search**.\n\n"
        "- Current query: None\n"
        "- Returned results: 0 images"
    )


def error_overview(title: str, message: str) -> str:
    return f"### {title}\n\n{message}"


def search_overview(
    *,
    current_query: str,
    returned_results: int,
    message: str | None = None,
) -> str:
    lines = [
        "### Results Overview",
        "",
        f"- Current query: {current_query}",
        f"- Returned results: {returned_results} images",
    ]
    if message:
        lines.extend(["", message])
    return "\n".join(lines)


def result_to_state(result: SearchResult) -> ResultState:
    return {
        "id": result.id,
        "path": result.path,
        "filename": result.filename,
        "category": result.category,
        "score": result.score,
        "choice_label": f"{result.filename} | {result.category} | {result.score:.4f}",
    }


def result_gallery(results: list[ResultState]) -> list[GalleryItem]:
    gallery: list[GalleryItem] = []
    for result in results:
        caption = (
            f"File: {result['filename']}\n"
            f"Category: {result['category']}\n"
            f"Similarity: {float(result['score']):.4f}"
        )
        gallery.append((str(result["path"]), caption))
    return gallery


def favorite_gallery(favorites: list[FavoriteState] | None) -> list[GalleryItem]:
    gallery: list[GalleryItem] = []
    for favorite in favorites or []:
        favorite_path = Path(str(favorite.get("favorite_path", "")))
        if not favorite_path.exists():
            continue
        caption = (
            f"File: {favorite.get('filename', favorite_path.name)}\n"
            f"Category: {favorite.get('category', 'Unknown')}"
        )
        gallery.append((str(favorite_path), caption))
    return gallery


def text_query_preview(text: str) -> str:
    text = (text or "").strip()
    if not text:
        return TEXT_QUERY_EMPTY_PREVIEW
    return f"Current query: {text}"


def image_query_preview(image_present: bool) -> str:
    uploaded = "Yes" if image_present else "No"
    return f"Current query mode: image search\n\nImage uploaded: {uploaded}"