"""
EaseMed Universal Document Parser - Gradio entrypoint.
Used for a Gradio-SDK Hugging Face Space (no Docker access required).
See main.py for the FastAPI/Docker entrypoint.

Every Gradio app automatically exposes a programmatic API for its
functions (visible at <space-url>/?view=api). The Next.js backend calls
this via the @gradio/client package rather than a plain multipart POST,
since Gradio's wire format differs from a simple REST endpoint.
"""

import os

import gradio as gr

try:
    import spaces
    SPACES_AVAILABLE = True
except ImportError:
    SPACES_AVAILABLE = False

import parser_core as core


if SPACES_AVAILABLE:
    # This Space's hardware tier is ZeroGPU, which requires at least one
    # @spaces.GPU-decorated function to be detected at startup or the app
    # is killed with "No @spaces.GPU function detected during startup" -
    # even though this parser is pure CPU work and never actually needs a
    # GPU allocation. This function exists solely to satisfy that check
    # and is never called.
    @spaces.GPU
    def _zerogpu_startup_probe():
        return True


def parse_rfq(file_path: str):
    if not file_path:
        return {
            "title": "Error Parsing",
            "description": "No file provided",
            "sections": [],
            "line_items": [],
            "fields": [],
            "provider": "self-hosted",
        }

    with open(file_path, "rb") as f:
        content = f.read()
    filename = os.path.basename(file_path)

    try:
        return core.parse_document(content, filename)
    except core.UnsupportedFileType as e:
        return {
            "title": "Error Parsing",
            "description": str(e),
            "sections": [],
            "line_items": [],
            "fields": [],
            "provider": "self-hosted",
        }


demo = gr.Interface(
    fn=parse_rfq,
    inputs=gr.File(label="Requirements Document (PDF/Image/Word/Excel)", type="filepath"),
    outputs=gr.JSON(label="Parsed RFQ Data"),
    title="EaseMed Universal Document Parser",
    description=(
        "Upload a procurement requisition document (PDF, image, .docx, "
        ".xlsx) to extract structured medicine line items "
        "(name, dosage, form, quantity, category)."
    ),
    api_name="parse_rfq",
)

if __name__ == "__main__":
    # ssr_mode disabled: it spawns a Node.js SSR proxy in front of the
    # Python server, which exits immediately in this Space's Docker image
    # (no visible error, just an immediate "Stopping Node.js server...").
    # Plain client-side rendering doesn't need Node at all.
    demo.launch(ssr_mode=False)