"""Timeframe conversion between CCXT and MT5Bridge formats.

CCXT uses short lowercase strings:  "1m", "5m", "15m", "30m", "1h", "4h", "1d"
MT5Bridge uses prefixed identifiers: "TIMEFRAME_M1", "TIMEFRAME_M5", ...
"""

# CCXT format -> MT5Bridge format
CCXT_TO_MT5 = {
    "1m": "TIMEFRAME_M1",
    "5m": "TIMEFRAME_M5",
    "15m": "TIMEFRAME_M15",
    "30m": "TIMEFRAME_M30",
    "1h": "TIMEFRAME_H1",
    "4h": "TIMEFRAME_H4",
    "1d": "TIMEFRAME_D1",
}

# MT5Bridge format -> CCXT format (reverse mapping)
MT5_TO_CXT = {v: k for k, v in CCXT_TO_MT5.items()}

# Timeframe duration in seconds (used for time-based queries)
CCXT_TIMEFRAME_SECONDS = {
    "1m": 60,
    "5m": 300,
    "15m": 900,
    "30m": 1800,
    "1h": 3600,
    "4h": 14400,
    "1d": 86400,
}


def to_mt5(timeframe):
    """Convert CCXT timeframe string to MT5Bridge format.

    Args:
        timeframe: CCXT timeframe (e.g. "1h", "1d")

    Returns:
        str: MT5Bridge timeframe (e.g. "TIMEFRAME_H1")

    Raises:
        ValueError: if timeframe is not supported
    """
    if timeframe not in CCXT_TO_MT5:
        raise ValueError(
            f"Unsupported timeframe '{timeframe}'. "
            f"Supported: {sorted(CCXT_TO_MT5.keys())}"
        )
    return CCXT_TO_MT5[timeframe]


def to_ccxt(timeframe):
    """Convert MT5Bridge timeframe string to CCXT format.

    Args:
        timeframe: MT5Bridge timeframe (e.g. "TIMEFRAME_H1")

    Returns:
        str: CCXT timeframe (e.g. "1h")

    Raises:
        ValueError: if timeframe is unknown
    """
    if timeframe not in MT5_TO_CXT:
        raise ValueError(
            f"Unknown MT5Bridge timeframe '{timeframe}'. "
            f"Supported: {sorted(MT5_TO_CXT.values())}"
        )
    return MT5_TO_CXT[timeframe]