"""Bridge Troll — Gradio app.

Each session, Gorm is secretly assigned one of several hidden NATURES. The player
wins by discovering what moves THIS troll — generic sob stories are discounted.
On win (resolve -> 0) or loss (resolve -> LOSE_AT, he hurls you back), a reveal
card shows what his nature was.

Local loop test (no GPU/download):  BRIDGE_TROLL_MOCK=1 python app.py
"""

from __future__ import annotations

import os

import gradio as gr

from troll_engine import (GameState, START_RESOLVE, LOSE_AT, build_messages,
                          parse_judgment, random_nature)
from models import get_backend

# ZeroGPU decorator — no-op locally. Supports @gpu and @gpu(duration=...).
try:
    import spaces

    gpu = spaces.GPU
except Exception:

    def gpu(*args, **_kwargs):
        if args and callable(args[0]):
            return args[0]
        return lambda fn: fn


_backend = get_backend()


@gpu(duration=30)
def _generate(messages: list[dict]) -> str:
    return _backend.generate(messages)


INTRO = ("A mossy troll heaves himself upright across the only bridge over the Mirebeck. "
         '*"None cross Gorm\'s bridge for free, traveller. Give me a reason — a *good* one."*')


def _meter_html(resolve: int, won: bool, lost: bool) -> str:
    if won:
        return ("<div class='resolve-wrap'><div class='resolve-label'>GORM HAS STEPPED ASIDE 🌉</div>"
                "<div class='resolve-bar'><div class='resolve-fill won' style='width:0%'></div></div></div>")
    if lost:
        return ("<div class='resolve-wrap'><div class='resolve-label'>GORM HURLS YOU BACK 💢</div>"
                "<div class='resolve-bar'><div class='resolve-fill lost' style='width:100%'></div></div></div>")
    pct = max(0, min(100, round(resolve / START_RESOLVE * 100)))
    hue = 90 + (1 - pct / 100) * 30
    return ("<div class='resolve-wrap'>"
            f"<div class='resolve-label'>Gorm's Resolve — {resolve}</div>"
            f"<div class='resolve-bar'><div class='resolve-fill' "
            f"style='width:{pct}%;background:hsl({hue},55%,42%)'></div></div></div>")


def _reveal(state: GameState) -> str:
    if not state.over or not state.nature:
        return ""
    n = state.nature
    if state.won:
        return (f"### 🌉 You crossed in {state.turns} turns.\n"
                f"**This Gorm's hidden nature:** *{n['name']}* — moved by {n['soft']}.")
    return (f"### 💢 Gorm lost patience and hurled you back.\n"
            f"**His hidden nature was:** *{n['name']}* — moved by {n['soft']}. "
            f"You leaned too hard on what he can't stand: {n['sore']}.")


def on_submit(user_text: str, chat: list, state: GameState):
    user_text = (user_text or "").strip()
    if not user_text or state.over:
        return chat, state, _meter_html(state.resolve, state.won, state.lost), "", _reveal(state), gr.update()

    raw = _generate(build_messages(state, user_text))
    j = parse_judgment(raw)
    state.history.append({"role": "user", "content": user_text})
    state.history.append({"role": "assistant", "content": j.reply})
    state.apply(j)

    chat = chat + [{"role": "user", "content": user_text},
                   {"role": "assistant", "content": j.reply}]
    why = f"*{j.tactic.value}* · {j.reason}" + (f" · persuasiveness {j.persuasiveness}/5"
                                                if j.tactic.value == "genuine" else "")
    box = gr.update(interactive=not state.over,
                    placeholder="The bridge is yours." if state.won else
                    ("Gorm has thrown you out." if state.lost else "Speak to Gorm…"))
    return chat, state, _meter_html(state.resolve, state.won, state.lost), why, _reveal(state), box


def on_reset():
    state = GameState(nature=random_nature())
    chat = [{"role": "assistant", "content": INTRO}]
    return (chat, state, _meter_html(state.resolve, False, False), "", "",
            gr.update(interactive=True, value="", placeholder="Speak to Gorm…"))


CSS = """
.resolve-wrap { margin: 6px 0 14px; }
.resolve-label { font-family: Georgia, serif; font-size: 14px; letter-spacing:.04em; margin-bottom:4px; }
.resolve-bar { height: 16px; background:#2a2118; border:1px solid #5a4a32; border-radius:9px; overflow:hidden; }
.resolve-fill { height:100%; transition: width .5s ease, background .5s ease; }
.resolve-fill.won { background:#caa54a; }
.resolve-fill.lost { background:#a33; }
#why { font-family: Georgia, serif; opacity:.8; min-height:1.4em; }
#reveal { font-family: Georgia, serif; }
"""

with gr.Blocks(title="Bridge Troll") as demo:
    gr.Markdown("## 🧌🌉 Bridge Troll\n*Talk your way across — if your argument is actually good. "
                "Every troll is hiding something different.*")
    if os.environ.get("BRIDGE_TROLL_MOCK") == "1":
        gr.Markdown("> ⚠️ **MOCK MODE** — keyword stub, not the real model. "
                    "Natures, discovery, and probing do NOT work here. "
                    "Run on the Space (no `BRIDGE_TROLL_MOCK`) to play the real Gorm.")
    meter = gr.HTML(_meter_html(START_RESOLVE, False, False))
    chatbot = gr.Chatbot(value=[{"role": "assistant", "content": INTRO}], height=420, show_label=False)
    why = gr.Markdown("", elem_id="why")
    reveal = gr.Markdown("", elem_id="reveal")
    with gr.Row():
        box = gr.Textbox(placeholder="Speak to Gorm…", show_label=False, scale=8, autofocus=True)
        send = gr.Button("Say it", variant="primary", scale=1)
    reset = gr.Button("New traveller", size="sm")

    state = gr.State(GameState(nature=random_nature()))
    outs = [chatbot, state, meter, why, reveal, box]

    send.click(on_submit, [box, chatbot, state], outs).then(lambda: "", None, box)
    box.submit(on_submit, [box, chatbot, state], outs).then(lambda: "", None, box)
    reset.click(on_reset, None, outs)
    demo.load(on_reset, None, outs)  # fresh hidden nature for every visitor


if __name__ == "__main__":
    demo.launch(css=CSS, theme=gr.themes.Soft())