from __future__ import annotations

import asyncio
from typing import Any, Dict, List

from aiohttp import web

from cvttpy_tools.app import App
from cvttpy_tools.base import NamedObject
from cvttpy_tools.config import CvttAppConfig
from cvttpy_tools.logger import Log
from cvttpy_tools.web.rest_service import RestService
from cvttpy_trading.trading.exchange_config import ExchangeAccounts
from cvttpy_trading.trading.instrument import ExchangeInstrument

from pairs_trading.lib.pair_selector_engine import PairSelectionEngine


class PairSelector(NamedObject):
    instruments_: List[ExchangeInstrument]
    engine_: PairSelectionEngine
    rest_service_: RestService

    def __init__(self) -> None:
        App.instance().add_cmdline_arg("--oneshot", action="store_true", default=False)
        App.instance().add_call(App.Stage.Config, self._on_config())
        App.instance().add_call(App.Stage.Run, self.run())

    async def _on_config(self) -> None:
        cfg = CvttAppConfig.instance()
        self.instruments_ = self._load_instruments(cfg)
        price_field = cfg.get_value("model/stat_model_price", "close")

        self.engine_ = PairSelectionEngine(
            config=cfg,
            instruments=self.instruments_,
            price_field=price_field,
        )

        self.rest_service_ = RestService(config_key="/api/REST")
        self.rest_service_.add_handler("GET", "/data_quality", self._on_data_quality)
        self.rest_service_.add_handler("GET", "/pair_selection", self._on_pair_selection)

    def _load_instruments(self, cfg: CvttAppConfig) -> List[ExchangeInstrument]:
        instruments_cfg = cfg.get_value("instruments", [])
        instruments: List[ExchangeInstrument] = []
        assert len(instruments_cfg) >= 2, "at least two instruments required"
        for item in instruments_cfg:
            if isinstance(item, str):
                parts = item.split(":", 1)
                if len(parts) != 2:
                    raise ValueError(f"invalid instrument format: {item}")
                exch_acct, instrument_id = parts
            elif isinstance(item, dict):
                exch_acct = item.get("exch_acct", "")
                instrument_id = item.get("instrument_id", "")
                if not exch_acct or not instrument_id:
                    raise ValueError(f"invalid instrument config: {item}")
            else:
                raise ValueError(f"unsupported instrument entry: {item}")

            exch_inst = ExchangeAccounts.instance().get_exchange_instrument(
                exch_acct=exch_acct, instrument_id=instrument_id
            )
            assert exch_inst is not None, f"no ExchangeInstrument for {exch_acct}:{instrument_id}"
            exch_inst.user_data_["exch_acct"] = exch_acct
            instruments.append(exch_inst)
        return instruments

    async def run(self) -> None:
        oneshot = App.instance().get_argument("oneshot", False)
        while True:
            await self.engine_.run_once()
            if oneshot:
                break
            sleep_for = self.engine_.sleep_seconds_until_next_cycle()
            await asyncio.sleep(sleep_for)

    async def _on_data_quality(self, request: web.Request) -> web.Response:
        fmt = request.query.get("format", "html").lower()
        quality = self.engine_.quality_dicts()
        if fmt == "json":
            return web.json_response(quality)
        return web.Response(text=self._render_quality_html(quality), content_type="text/html")

    async def _on_pair_selection(self, request: web.Request) -> web.Response:
        fmt = request.query.get("format", "html").lower()
        pairs = self.engine_.pair_dicts()
        if fmt == "json":
            return web.json_response(pairs)
        return web.Response(text=self._render_pairs_html(pairs), content_type="text/html")

    def _render_quality_html(self, quality: List[Dict[str, Any]]) -> str:
        rows = "".join(
            f"<tr>"
            f"<td>{q.get('instrument','')}</td>"
            f"<td>{q.get('record_count','')}</td>"
            f"<td>{q.get('latest_tstamp','')}</td>"
            f"<td>{q.get('status','')}</td>"
            f"<td>{q.get('reason','')}</td>"
            f"</tr>"
            for q in sorted(quality, key=lambda x: str(x.get("instrument", "")))
        )
        return f"""
<!DOCTYPE html>
<html>
<head>
    <meta charset='utf-8'/>
    <title>Data Quality</title>
    <style>
        body {{ font-family: Arial, sans-serif; margin: 20px; }}
        table {{ border-collapse: collapse; width: 100%; }}
        th, td {{ border: 1px solid #ccc; padding: 8px; text-align: left; }}
        th {{ background: #f2f2f2; }}
    </style>
</head>
<body>
    <h2>Data Quality</h2>
    <table>
        <thead>
            <tr><th>Instrument</th><th>Records</th><th>Latest</th><th>Status</th><th>Reason</th></tr>
        </thead>
        <tbody>{rows}</tbody>
    </table>
</body>
</html>
"""

    def _render_pairs_html(self, pairs: List[Dict[str, Any]]) -> str:
        if not pairs:
            body = "<p>No pairs available. Check data quality and try again.</p>"
        else:
            body_rows = []
            for p in pairs:
                body_rows.append(
                    "<tr>"
                    f"<td>{p.get('instrument_a','')}</td>"
                    f"<td>{p.get('instrument_b','')}</td>"
                    f"<td data-value='{p.get('rank_eg',0)}'>{p.get('rank_eg','')}</td>"
                    f"<td data-value='{p.get('rank_adf',0)}'>{p.get('rank_adf','')}</td>"
                    f"<td data-value='{p.get('rank_j',0)}'>{p.get('rank_j','')}</td>"
                    f"<td data-value='{p.get('pvalue_eg','')}'>{p.get('pvalue_eg','')}</td>"
                    f"<td data-value='{p.get('pvalue_adf','')}'>{p.get('pvalue_adf','')}</td>"
                    f"<td data-value='{p.get('pvalue_j','')}'>{p.get('pvalue_j','')}</td>"
                    "</tr>"
                )
            body = "\n".join(body_rows)

        return f"""
<!DOCTYPE html>
<html>
<head>
    <meta charset='utf-8'/>
    <title>Pair Selection</title>
    <style>
        body {{ font-family: Arial, sans-serif; margin: 20px; }}
        table {{ border-collapse: collapse; width: 100%; }}
        th, td {{ border: 1px solid #ccc; padding: 8px; text-align: left; }}
        th.sortable {{ cursor: pointer; background: #f2f2f2; }}
    </style>
</head>
<body>
    <h2>Pair Selection</h2>
    <table id="pairs-table">
        <thead>
            <tr>
                <th>Instrument A</th>
                <th>Instrument B</th>
                <th class="sortable" data-type="num">Rank-EG</th>
                <th class="sortable" data-type="num">Rank-ADF</th>
                <th class="sortable" data-type="num">Rank-J</th>
                <th>EG p-value</th>
                <th>ADF p-value</th>
                <th>Johansen pseudo p</th>
            </tr>
        </thead>
        <tbody>
            {body}
        </tbody>
    </table>
    <script>
    (function() {{
        const table = document.getElementById('pairs-table');
        if (!table) return;
        const getValue = (cell) => {{
            const val = cell.getAttribute('data-value');
            const num = parseFloat(val);
            return isNaN(num) ? val : num;
        }};
        const toggleSort = (index, isNumeric) => {{
            const tbody = table.querySelector('tbody');
            const rows = Array.from(tbody.querySelectorAll('tr'));
            const th = table.querySelectorAll('th')[index];
            const dir = th.getAttribute('data-dir') === 'asc' ? 'desc' : 'asc';
            th.setAttribute('data-dir', dir);
            rows.sort((a, b) => {{
                const va = getValue(a.children[index]);
                const vb = getValue(b.children[index]);
                if (isNumeric && !isNaN(va) && !isNaN(vb)) {{
                    return dir === 'asc' ? va - vb : vb - va;
                }}
                return dir === 'asc'
                    ? String(va).localeCompare(String(vb))
                    : String(vb).localeCompare(String(va));
            }});
            tbody.innerHTML = '';
            rows.forEach(r => tbody.appendChild(r));
        }};
        table.querySelectorAll('th.sortable').forEach((th, idx) => {{
            th.addEventListener('click', () => toggleSort(idx, th.dataset.type === 'num'));
        }});
    }})();
    </script>
</body>
</html>
"""


if __name__ == "__main__":
    App()
    CvttAppConfig()
    PairSelector()
    App.instance().run()