"""TemperCheck — Gradio app.

Upload a social-media profile screenshot; get a playful "temper" read from a
small Gemma 4 vision model. For the Build Small Hackathon (model <= 32B, Gradio
on Hugging Face Spaces).

Run locally (Ollama backend, default):   uv run app.py
Run the Spaces backend locally:          TEMPER_BACKEND=transformers uv run app.py
"""

from __future__ import annotations

import os

import gradio as gr

from tempercheck import get_backend_name, score_image

PORT = int(os.environ.get("TEMPER_PORT", "7140"))

# Bind real Ctrl-V: Gradio's "clipboard" source only adds a click-to-paste
# button, so we listen for the browser paste event ourselves and feed the
# pasted image into the component's hidden file input. If an image is already
# loaded the upload input is gone from the DOM, so we click the clear button
# first, then inject on the next tick.
#
# Guards against a perpetual-resize loop:
#   * __temperPasteBound — demo.load() can re-run on reconnect, so bind the
#     paste listener exactly once; stacked listeners inject the image several
#     times and thrash the layout.
#   * `busy` lock — ignore further paste events for a moment while one is being
#     processed, so a single Ctrl-V can't kick off overlapping injects.
PASTE_JS = """
() => {
  if (window.__temperPasteBound) return;
  window.__temperPasteBound = true;
  let busy = false;
  const inject = (blob) => {
    const root = document.querySelector('#temper_image');
    if (!root) return;
    let input = root.querySelector("input[type='file']");
    if (!input) {
      const clear = root.querySelector("button[aria-label='Clear'], button[title='Clear']");
      if (clear) {
        clear.click();
        return setTimeout(() => inject(blob), 80);
      }
      return;
    }
    const dt = new DataTransfer();
    dt.items.add(new File([blob], 'pasted.png', { type: blob.type || 'image/png' }));
    input.files = dt.files;
    input.dispatchEvent(new Event('change', { bubbles: true }));
  };
  window.addEventListener('paste', (e) => {
    if (busy) return;
    const items = (e.clipboardData || window.clipboardData)?.items || [];
    for (const it of items) {
      if (it.type && it.type.startsWith('image/')) {
        const blob = it.getAsFile();
        if (blob) {
          e.preventDefault();
          busy = true;
          inject(blob);
          setTimeout(() => { busy = false; }, 600);
        }
        return;
      }
    }
  });
}
"""

DISCLAIMER = (
    "TemperCheck is a fast LLM-based back-of-the-envelope calculation to see if a "
    "given social media profile is run by someone with a bad temper. It performs a "
    "quick visual analysis of a screenshot of a profile, and makes a hypothetical "
    "judgment accordingly. *It is NOT a real personality and says nothing factual "
    "about any actual person.*"
)


def _render(verdict) -> tuple[str, str]:
    bar = "█" * (verdict.score // 5) + "░" * (20 - verdict.score // 5)
    signals = "  ".join(f"`{s}`" for s in verdict.signals) if verdict.signals else "—"
    md = (
        f"## {verdict.band}\n\n"
        f"**{verdict.verdict}** — temper **{verdict.score}/100**\n\n"
        f"`{bar}`\n\n"
        f"{verdict.rationale}\n\n"
        f"**Signals:** {signals}"
    )
    return md, verdict.raw


def analyze(image):
    if image is None:
        return "Upload a profile screenshot to get a read.", ""
    try:
        return _render(score_image(image))
    except Exception as exc:  # surface backend/connection errors to the user
        return (
            f"⚠️ Could not score this image.\n\n```\n{type(exc).__name__}: {exc}\n```",
            "",
        )


def _disable_button():
    return gr.update(interactive=False)


def _enable_button():
    return gr.update(interactive=True)


with gr.Blocks(title="TemperCheck") as demo:
    gr.Markdown("# 😤 TemperCheck\n### How short a temper does this profile look to have?")
    gr.Markdown(DISCLAIMER)
    with gr.Row():
        with gr.Column():
            image_in = gr.Image(
                type="pil",
                label="Profile image / screenshot",
                sources=["upload", "clipboard"],
                elem_id="temper_image",
                height=400,  # fixed box stops the paste-time resize feedback loop
            )
            go = gr.Button("Check the temper ☕", variant="primary")
        with gr.Column():
            result = gr.Markdown(label="Verdict")
            with gr.Accordion("Raw model output (agent trace)", open=False):
                raw = gr.Code(label="raw")
    # Only the button runs a check — pasting/uploading just loads the image.
    # Disable the button while the check runs, then re-enable it; analyze() never
    # raises, so the final .then always restores the button.
    go.click(_disable_button, None, go).then(
        analyze, inputs=image_in, outputs=[result, raw]
    ).then(_enable_button, None, go)
    gr.Markdown(f"<sub>Backend: `{get_backend_name()}`</sub>")
    demo.load(None, None, None, js=PASTE_JS)


if __name__ == "__main__":
    if os.environ.get("SPACE_ID"):
        # On Hugging Face Spaces, let the platform manage host/port.
        demo.launch(theme=gr.themes.Soft())
    else:
        demo.launch(
            server_name="0.0.0.0", server_port=PORT, theme=gr.themes.Soft()
        )