import dash
from dash import html, dcc, Input, Output
import yfinance as yf
import os

# =========================
# PATH
# =========================
BASE_DIR = os.path.dirname(__file__)

# =========================
# INIT APP
# =========================
app = dash.Dash(
    __name__,
    use_pages=True,
    pages_folder=os.path.join(BASE_DIR, "pages"),
    suppress_callback_exceptions=True,
    external_stylesheets=[
        "https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.5.0/css/all.min.css"
    ]
)

server = app.server  # 🔥 IMPORTANT pour Hugging Face

app.title = "TradeLux - Plateforme de Trading"

# =========================
# TICKERS
# =========================
TICKERS = {
    "BTC-USD": "BTC/USD",
    "ETH-USD": "ETH/USD",
    "^IXIC": "NASDAQ",
    "AAPL": "AAPL",
    "GOOGL": "GOOGL"
}

# =========================
# FETCH DATA
# =========================
def fetch_ticker_data():
    data = []

    for symbol, label in TICKERS.items():
        try:
            stock = yf.Ticker(symbol)
            hist = stock.history(period="1d", interval="1m")

            if len(hist) >= 2:
                current = hist['Close'].iloc[-1]
                prev = hist['Close'].iloc[-2]

                change = (current - prev) / prev * 100
                change_class = "up" if change > 0 else "down"

                data.append({
                    "label": label,
                    "value": f"{current:,.2f}",
                    "change": f"{change:+.2f}%",
                    "class": change_class
                })

            else:
                data.append({
                    "label": label,
                    "value": "N/A",
                    "change": "0.00%",
                    "class": "down"
                })

        except Exception as e:
            print("Ticker error:", e)
            data.append({
                "label": label,
                "value": "ERR",
                "change": "0.00%",
                "class": "down"
            })

    return data

# =========================
# BACKGROUND SAFE (IMPORTANT)
# =========================
background = html.Div(
    [
        html.Div(className="trade-bg"),
        html.Div(className="grid-lines"),
        html.Div(
            [html.Div(className="particle") for _ in range(40)],
            style={
                "position": "fixed",
                "zIndex": -10,
                "pointerEvents": "none"
            }
        )
    ]
)

# =========================
# NAVBAR
# =========================
navbar = html.Div(
    className="navbar",
    children=[
        html.Div(
            className="navbar-left",
            children=[
                html.Img(src="/assets/logo.png", className="logo")
            ]
        ),
        html.Div(
            className="nav-links",
            children=[
                dcc.Link("Accueil", href="/", className="nav-link"),
                dcc.Link("Marchés", href="/actions", className="nav-link"),
                dcc.Link("Analyse", href="/data", className="nav-link"),
            ]
        ),
    ]
)

# =========================
# LAYOUT
# =========================
app.layout = html.Div([

    # Background FIXED (non bloquant)
    background,

    # Ticker dynamique
    html.Div(id="ticker-container"),

    # Navbar
    navbar,

    # Content
    html.Div(
        className="page-content",
        children=[
            dash.page_container
        ],
        style={"zIndex": 1}  # 🔥 FIX CLICK
    ),

    # Interval
    dcc.Interval(id="interval", interval=60000, n_intervals=0)

])

# =========================
# CALLBACK TICKER (FIX STRUCTURE)
# =========================
@app.callback(
    Output("ticker-container", "children"),
    Input("interval", "n_intervals")
)
def update_ticker(n):

    data = fetch_ticker_data()

    items = [
        html.Div(className="ticker-item", children=[
            html.Span(d["label"]),
            html.Span(d["value"], className="ticker-value"),
            html.Span(d["change"], className=f"ticker-change {d['class']}")
        ])
        for d in data
    ]

    return html.Div(
        className="ticker-wrap",
        children=[
            html.Div(
                className="ticker-inner",
                children=[
                    html.Div(className="ticker-set", children=items),
                    html.Div(className="ticker-set", children=items)  # duplication scroll
                ]
            )
        ]
    )

# =========================
# RUN
# =========================
if __name__ == "__main__":
    app.run(host="0.0.0.0", port=7860, debug=True)