from flask import Flask, request, jsonify, render_template, url_for
from urllib.parse import urlencode
import requests
import os

app = Flask(__name__)

# External screenshot service config
SCREENSHOT_API = "https://corvo-ai-xx-sc.hf.space/capture"

# Allowed intervals and mapping to TradingView "interval" code
INTERVAL_MAP = {
    # minutes
    "1m": "1",
    "3m": "3",
    "5m": "5",
    "5min": "5",
    "15m": "15",
    "15min": "15",
    "30m": "30",
    "30min": "30",
    # hours
    "1h": "60",
    "2h": "120",
    "4h": "240",
    # days/weeks/months
    "1d": "D",
    "1D": "D",
    "d": "D",
    "D": "D",
    "1w": "W",
    "1W": "W",
    "w": "W",
    "W": "W",
    "1mth": "M",
    "1M": "M",
    "m": "M",
    "M": "M"
}

def normalize_interval(raw_interval: str) -> str:
    if not raw_interval:
        return "D"
    key = raw_interval.strip()
    return INTERVAL_MAP.get(key, key)

def parse_indicators_param(indicators_raw):
    # Accept indicators as:
    # - JSON array in body or query (list)
    # - Comma-separated string "PUB;id1,PUB;id2"
    # Returns a list of indicator IDs
    if indicators_raw is None:
        return []
    if isinstance(indicators_raw, list):
        return [str(x).strip() for x in indicators_raw if str(x).strip()]
    if isinstance(indicators_raw, str):
        parts = [p.strip() for p in indicators_raw.split(",") if p.strip()]
        return parts
    return []

@app.route("/")
def index():
    return jsonify({
        "message": "Chart Screenshot API",
        "endpoints": {
            "chart_html": "/chart?symbol=BTCUSDT&exchange=BINANCE&interval=1h&indicators=PUB;abc,PUB;def",
            "screenshot_api": "/api/screenshot"
        }
    })

@app.route("/chart")
def chart():
    # This endpoint renders the TradingView chart using query params:
    # symbol, exchange, interval, indicators (comma separated), theme (optional)
    symbol = request.args.get("symbol", "BTCUSDT")
    exchange = request.args.get("exchange", "BINANCE")
    interval = normalize_interval(request.args.get("interval", "1D"))
    indicators = parse_indicators_param(request.args.get("indicators"))
    theme = request.args.get("theme", "dark")

    return render_template(
        "chart.html",
        symbol=symbol,
        exchange=exchange,
        interval=interval,
        indicators=indicators,
        theme=theme
    )

@app.route("/api/screenshot", methods=["POST"])
def api_screenshot():
    """
    Request JSON:
    {
      "symbol": "BTCUSDT",                 // required
      "exchange": "BINANCE",               // optional, default BINANCE
      "interval": "1h",                    // optional, default 1D
      "indicators": ["PUB;id1","PUB;id2"], // optional, or comma-separated string
      "theme": "dark",                     // optional, default "dark"
      "width": 1080,                       // optional
      "height": 1920,                      // optional
      "fullPage": false                    // optional
    }

    Response JSON:
    {
      "imageUrl": "https://...png",
      "htmlUrl": "https://...html",
      "screenshotMeta": {...}
    }
    """
    data = request.get_json(silent=True) or {}

    symbol = data.get("symbol", None)
    if not symbol:
        return jsonify({"error": "symbol is required"}), 400

    exchange = data.get("exchange", "BINANCE")
    interval = normalize_interval(data.get("interval", "1D"))
    indicators = parse_indicators_param(data.get("indicators"))
    theme = data.get("theme", "dark")

    # Build the chart URL hosted by this same app
    # indicators are passed as comma-separated values
    query = {
        "symbol": symbol,
        "exchange": exchange,
        "interval": interval,
        "theme": theme
    }
    if indicators:
        query["indicators"] = ",".join(indicators)

    # Absolute URL to /chart so the screenshot service can access it
    chart_url = request.url_root.rstrip("/") + url_for("chart") + "?" + urlencode(query)

    # Build screenshot payload
    width = data.get("width", 1080)
    height = data.get("height", 1920)
    full_page = data.get("fullPage", False)

    payload = {
        "urls": [chart_url],
        "width": width,
        "height": height,
        "fullPage": bool(full_page)
    }

    try:
        resp = requests.post(SCREENSHOT_API, json=payload, timeout=60)
    except requests.RequestException as e:
        return jsonify({"error": "Failed to reach screenshot service", "details": str(e)}), 502

    if resp.status_code != 200:
        return jsonify({"error": "Screenshot service error", "status": resp.status_code, "body": resp.text}), 502

    body = resp.json()
    errors = body.get("errors") or []
    if errors:
        return jsonify({"error": "Screenshot service reported errors", "details": errors}), 502

    results = body.get("results") or []
    if not results:
        return jsonify({"error": "No results from screenshot service"}), 502

    first = results[0]
    output = first.get("output") or {}
    image_url = output.get("imageUrl")
    html_url = output.get("htmlUrl")

    if not image_url:
        return jsonify({"error": "Screenshot result missing imageUrl", "raw": first}), 502

    # Return only the URLs (what you asked for), plus meta for debugging
    return jsonify({
        "imageUrl": image_url,
        "htmlUrl": html_url,
        "screenshotMeta": first.get("meta", {})
    })

if __name__ == "__main__":
    # Host and port can be configured via env
    host = os.getenv("HOST", "0.0.0.0")
    port = int(os.getenv("PORT", "7860"))
    app.run(host=host, port=port, debug=True)