from flask import (
    Flask,
    make_response,
    request,
    jsonify,
    render_template,
    send_from_directory,
    send_file,
)
import os
import requests
from datetime import datetime, UTC
import dotenv
from typing import Any

dotenv.load_dotenv()

app = Flask(__name__)

POOL_API_BASE = os.getenv("POOL_API_BASE", "http://127.0.0.1:32872/api")
POOL_REQUEST_TIMEOUT = float(os.getenv("POOL_REQUEST_TIMEOUT", "6"))
NODE_RPC_URL = os.getenv("NODE_RPC_URL", "http://127.0.0.1:32869")
NODE_RPC_USER = os.getenv("NODE_RPC_USER", "")
NODE_RPC_PASS = os.getenv("NODE_RPC_PASS", "")
NODE_RPC_TIMEOUT = float(os.getenv("NODE_RPC_TIMEOUT", "6"))


def find(name, path):
    for root, dirs, files in os.walk(path):
        if name in files:
            return os.path.join(root, name)


def pool_get(endpoint: str) -> Any:
    """Fetch data from the upstream pool API."""
    base = POOL_API_BASE.rstrip("/")
    url = f"{base}/{endpoint.lstrip('/')}"
    resp = requests.get(url, timeout=POOL_REQUEST_TIMEOUT)
    resp.raise_for_status()
    return resp.json()


def to_float(value: Any, default: float = 0.0) -> float:
    try:
        return float(value)
    except (TypeError, ValueError):
        return default


def to_int(value: Any, default: int = 0) -> int:
    try:
        return int(value)
    except (TypeError, ValueError):
        return default


def satoshi_to_fbc(value: Any) -> float:
    return to_float(value, 0.0) / 1_000_000.0


def normalize_address(raw: str) -> str:
    return (raw or "").strip()


def worker_matches_address(worker_username: str, address_query: str) -> bool:
    """Support searching by base address while matching address.rig worker names."""
    username = normalize_address(worker_username)
    address = normalize_address(address_query)
    if not username or not address:
        return False

    return username == address or username.startswith(f"{address}.")


def sanitize_worker_data(worker: dict) -> dict:
    """Remove sensitive fields from worker data before sending to client."""
    sanitized = dict(worker)
    sanitized.pop("address", None)  # Remove IP address
    return sanitized


# Blockchain constants
BLOCK_TIME_SECONDS = 120  # Target block time in seconds
INITIAL_BLOCK_REWARD = 500_000_000  # 500 FBC in satoshis
HALVING_INTERVAL = 1_051_200  # blocks between halvings
BLOCKS_PER_DAY = 86400 // BLOCK_TIME_SECONDS


def get_block_reward(height: int) -> int:
    """Calculate block reward (in satoshis) at given height, accounting for halvings."""
    halvings = height // HALVING_INTERVAL
    if halvings >= 32:  # Prevent overflow; reward becomes 0
        return 0
    return INITIAL_BLOCK_REWARD >> halvings


def estimate_network_hashrate(difficulty: float) -> float:
    """Estimate network hashrate from chain difficulty."""
    if difficulty <= 0:
        return 0.0
    # Handshake-like PoW approximation.
    return (difficulty * (2**32)) / BLOCK_TIME_SECONDS


def get_blockchain_info() -> dict:
    """Fetch getblockchaininfo from node RPC."""
    payload = {"method": "getblockchaininfo", "params": [], "id": "pool-dashboard"}
    auth = (NODE_RPC_USER, NODE_RPC_PASS) if NODE_RPC_USER and NODE_RPC_PASS else None
    resp = requests.post(
        NODE_RPC_URL, json=payload, auth=auth, timeout=NODE_RPC_TIMEOUT
    )
    resp.raise_for_status()
    data = resp.json()
    if data.get("error"):
        raise ValueError(f"RPC error: {data['error']}")
    result = data.get("result")
    if not isinstance(result, dict):
        raise ValueError("Invalid RPC response: missing result")
    return result


def resolve_network_metrics(stats: dict, blocks: list) -> dict:
    """Resolve network difficulty/hashrate, preferring node RPC."""
    fallback_height = to_int(blocks[0].get("height"), 0) if blocks else 0

    try:
        info = get_blockchain_info()
        difficulty = to_float(info.get("difficulty"))
        height = to_int(info.get("blocks"), fallback_height)
        return {
            "difficulty": difficulty,
            "hashrate": estimate_network_hashrate(difficulty),
            "height": height,
            "source": "node_rpc",
        }
    except (requests.RequestException, ValueError, TypeError):
        difficulty = to_float(stats.get("window_difficulty"))
        return {
            "difficulty": difficulty,
            "hashrate": estimate_network_hashrate(difficulty),
            "height": fallback_height,
            "source": "pool_window_difficulty",
        }


def calculate_reward_per_hash(current_height: int, network_hashrate: float) -> float:
    """Calculate expected reward per H/s per day in FBC.

    Formula:
    (block_reward_fbc * blocks_per_day) / network_hashrate_hps
    """
    if network_hashrate <= 0:
        return 0.0

    block_reward_fbc = satoshi_to_fbc(get_block_reward(current_height))
    daily_network_emission_fbc = block_reward_fbc * BLOCKS_PER_DAY
    return daily_network_emission_fbc / network_hashrate


def calculate_worker_reward_estimate(
    worker_hashrate: float, pool_hashrate: float, reward_per_hash: float
) -> dict:
    """Calculate estimated rewards for a worker."""
    if pool_hashrate <= 0 or reward_per_hash <= 0:
        return {
            "daily_fbc": 0.0,
            "hourly_fbc": 0.0,
            "weekly_fbc": 0.0,
            "pool_share_pct": 0.0,
        }

    pool_share = worker_hashrate / pool_hashrate if pool_hashrate > 0 else 0.0
    daily_reward = worker_hashrate * reward_per_hash

    return {
        "daily_fbc": daily_reward,
        "hourly_fbc": daily_reward / 24,
        "weekly_fbc": daily_reward * 7,
        "pool_share_pct": pool_share * 100,
    }


# Assets routes
@app.route("/assets/<path:path>")
def send_assets(path):
    if path.endswith(".json"):
        return send_from_directory(
            "templates/assets", path, mimetype="application/json"
        )

    if os.path.isfile("templates/assets/" + path):
        return send_from_directory("templates/assets", path)

    # Try looking in one of the directories
    filename: str = path.split("/")[-1]
    if (
        filename.endswith(".png")
        or filename.endswith(".jpg")
        or filename.endswith(".jpeg")
        or filename.endswith(".svg")
    ):
        if os.path.isfile("templates/assets/img/" + filename):
            return send_from_directory("templates/assets/img", filename)
        if os.path.isfile("templates/assets/img/favicon/" + filename):
            return send_from_directory("templates/assets/img/favicon", filename)

    return render_template("404.html"), 404


# region Special routes
@app.route("/favicon.png")
def faviconPNG():
    return send_from_directory("templates/assets/img", "favicon.png")


@app.route("/.well-known/<path:path>")
def wellknown(path):
    # Try to proxy to https://nathan.woodburn.au/.well-known/
    req = requests.get(f"https://nathan.woodburn.au/.well-known/{path}")
    return make_response(
        req.content, 200, {"Content-Type": req.headers["Content-Type"]}
    )


# endregion


# region Main routes
@app.route("/")
def index():
    return render_template("index.html")


@app.route("/<path:path>")
def catch_all(path: str):
    if os.path.isfile("templates/" + path):
        return render_template(path)

    # Try with .html
    if os.path.isfile("templates/" + path + ".html"):
        return render_template(path + ".html")

    if os.path.isfile("templates/" + path.strip("/") + ".html"):
        return render_template(path.strip("/") + ".html")

    # Try to find a file matching
    if path.count("/") < 1:
        # Try to find a file matching
        filename = find(path, "templates")
        if filename:
            return send_file(filename)

    return render_template("404.html"), 404


# endregion


# region API routes


@app.route("/api/v1/status", methods=["GET"])
def status():
    return jsonify(
        {
            "status": "ok",
            "version": "1.0",
            "updated_at": datetime.now(UTC).isoformat(),
        }
    )


@app.route("/api/v1/pool/overview", methods=["GET"])
def pool_overview():
    try:
        stats = pool_get("stats")
        workers = pool_get("workers")
        blocks = pool_get("blocks")
        balances = pool_get("balances")
        payouts = pool_get("payouts")
    except requests.RequestException as exc:
        return jsonify({"error": f"Failed to reach pool API: {exc}"}), 502
    except ValueError as exc:
        return jsonify({"error": f"Invalid pool API response: {exc}"}), 502

    total_balance = sum(to_int(entry.get("balance")) for entry in balances)
    total_paid = sum(to_int(entry.get("total_paid")) for entry in balances)
    total_earned = sum(to_int(entry.get("total_earned")) for entry in balances)
    total_payout_amount = sum(to_int(entry.get("amount")) for entry in payouts)

    pool_hashrate = to_float(stats.get("hashrate"))
    network = resolve_network_metrics(stats, blocks)
    network_hashrate = to_float(network.get("hashrate"))
    current_height = to_int(network.get("height"), 0)

    reward_per_hash = calculate_reward_per_hash(current_height, network_hashrate)
    current_block_reward_fbc = satoshi_to_fbc(get_block_reward(current_height))
    daily_network_emission_fbc = current_block_reward_fbc * BLOCKS_PER_DAY

    workers_with_estimates = []
    for worker in workers:
        w = sanitize_worker_data(worker)
        w["estimated_reward"] = calculate_worker_reward_estimate(
            to_float(worker.get("hashrate")), pool_hashrate, reward_per_hash
        )
        workers_with_estimates.append(w)

    summary = {
        "workers": to_int(stats.get("workers"), len(workers)),
        "hashrate": pool_hashrate,
        "blocks_found": to_int(stats.get("blocks_found")),
        "shares_in_window": to_int(stats.get("shares_in_window")),
        "window_difficulty": to_float(stats.get("window_difficulty")),
        "fee": to_float(stats.get("fee")),
        "uptime": to_int(stats.get("uptime")),
        "tracked_balances": len(balances),
        "tracked_payouts": len(payouts),
        "total_balance": total_balance,
        "total_balance_fbc": satoshi_to_fbc(total_balance),
        "total_paid": total_paid,
        "total_paid_fbc": satoshi_to_fbc(total_paid),
        "total_earned": total_earned,
        "total_earned_fbc": satoshi_to_fbc(total_earned),
        "total_payout_amount": total_payout_amount,
        "total_payout_amount_fbc": satoshi_to_fbc(total_payout_amount),
        "network_hashrate": network_hashrate,
        "network_difficulty": to_float(network.get("difficulty")),
        "network_metrics_source": network.get("source"),
        "block_time_seconds": BLOCK_TIME_SECONDS,
        "blocks_per_day": BLOCKS_PER_DAY,
        "current_block_reward_fbc": current_block_reward_fbc,
        "daily_network_emission_fbc": daily_network_emission_fbc,
        "estimated_reward_per_hash_daily_fbc": reward_per_hash,
    }

    return jsonify(
        {
            "source": POOL_API_BASE,
            "updated_at": datetime.now(UTC).isoformat(),
            "summary": summary,
            "workers": workers_with_estimates,
            "blocks": blocks,
            "balances": balances,
            "payouts": payouts,
        }
    )


@app.route("/api/v1/pool/miner", methods=["GET"])
def pool_miner():
    address = normalize_address(request.args.get("address", ""))
    if not address:
        return jsonify({"error": "Missing required query parameter: address"}), 400

    try:
        stats = pool_get("stats")
        workers = pool_get("workers")
        blocks = pool_get("blocks")
        balances = pool_get("balances")
        payouts = pool_get("payouts")
    except requests.RequestException as exc:
        return jsonify({"error": f"Failed to reach pool API: {exc}"}), 502
    except ValueError as exc:
        return jsonify({"error": f"Invalid pool API response: {exc}"}), 502

    # Estimate rewards first
    pool_hashrate = to_float(stats.get("hashrate"))
    network = resolve_network_metrics(stats, blocks)
    network_hashrate = to_float(network.get("hashrate"))
    current_height = to_int(network.get("height"), 0)

    reward_per_hash = calculate_reward_per_hash(current_height, network_hashrate)

    matching_workers = [
        worker
        for worker in workers
        if worker_matches_address(worker.get("username", ""), address)
    ]
    matching_blocks = [
        block
        for block in blocks
        if worker_matches_address(block.get("found_by", ""), address)
    ]
    matching_balances = [
        balance
        for balance in balances
        if worker_matches_address(balance.get("address", ""), address)
    ]
    matching_payouts = [
        payout
        for payout in payouts
        if worker_matches_address(payout.get("address", ""), address)
    ]

    total_hashrate = sum(
        to_float(worker.get("hashrate")) for worker in matching_workers
    )
    accepted = sum(to_int(worker.get("accepted")) for worker in matching_workers)
    rejected = sum(to_int(worker.get("rejected")) for worker in matching_workers)
    stale = sum(to_int(worker.get("stale")) for worker in matching_workers)
    blocks_found = sum(to_int(worker.get("blocks")) for worker in matching_workers)
    total_balance = sum(to_int(entry.get("balance")) for entry in matching_balances)
    total_earned = sum(to_int(entry.get("total_earned")) for entry in matching_balances)
    total_paid = sum(to_int(entry.get("total_paid")) for entry in matching_balances)
    payout_amount = sum(to_int(entry.get("amount")) for entry in matching_payouts)

    worker_reward_estimate = calculate_worker_reward_estimate(
        total_hashrate, pool_hashrate, reward_per_hash
    )

    # Add reward estimates for each matching worker
    workers_with_estimates = []
    for worker in matching_workers:
        w = sanitize_worker_data(worker)
        w["estimated_reward"] = calculate_worker_reward_estimate(
            to_float(worker.get("hashrate")), pool_hashrate, reward_per_hash
        )
        workers_with_estimates.append(w)

    return jsonify(
        {
            "address": address,
            "updated_at": datetime.utcnow().isoformat() + "Z",
            "summary": {
                "matching_workers": len(matching_workers),
                "hashrate": total_hashrate,
                "accepted": accepted,
                "rejected": rejected,
                "stale": stale,
                "blocks_found": blocks_found,
                "total_balance": total_balance,
                "total_balance_fbc": satoshi_to_fbc(total_balance),
                "total_earned": total_earned,
                "total_earned_fbc": satoshi_to_fbc(total_earned),
                "total_paid": total_paid,
                "total_paid_fbc": satoshi_to_fbc(total_paid),
                "payout_amount": payout_amount,
                "payout_amount_fbc": satoshi_to_fbc(payout_amount),
                "estimated_daily_reward_fbc": worker_reward_estimate["daily_fbc"],
                "estimated_weekly_reward_fbc": worker_reward_estimate["weekly_fbc"],
                "pool_share_pct": worker_reward_estimate["pool_share_pct"],
            },
            "workers": workers_with_estimates,
            "blocks": matching_blocks,
            "balances": matching_balances,
            "payouts": matching_payouts,
        }
    )


# endregion


# region Error Catching
# 404 catch all
@app.errorhandler(404)
def not_found(e):
    return render_template("404.html"), 404


# endregion
if __name__ == "__main__":
    app.run(debug=True, port=5000, host="0.0.0.0")