"""
LimeSDR command builder implementation.

Uses SoapySDR-based tools for FM demodulation and signal capture.
LimeSDR supports 100 kHz to 3.8 GHz frequency range.
"""

from typing import Optional

from .base import CommandBuilder, SDRCapabilities, SDRDevice, SDRType


class LimeSDRCommandBuilder(CommandBuilder):
    """LimeSDR command builder using SoapySDR tools."""

    CAPABILITIES = SDRCapabilities(
        sdr_type=SDRType.LIME_SDR,
        freq_min_mhz=0.1,        # 100 kHz
        freq_max_mhz=3800.0,     # 3.8 GHz
        gain_min=0.0,
        gain_max=73.0,           # Combined LNA + TIA + PGA
        sample_rates=[1000000, 2000000, 4000000, 8000000, 10000000, 20000000],
        supports_bias_t=False,
        supports_ppm=False,      # Uses TCXO, no PPM correction needed
        tx_capable=True
    )

    def _build_device_string(self, device: SDRDevice) -> str:
        """Build SoapySDR device string for LimeSDR."""
        if device.serial and device.serial != 'N/A':
            return f'driver=lime,serial={device.serial}'
        return f'driver=lime'

    def build_fm_demod_command(
        self,
        device: SDRDevice,
        frequency_mhz: float,
        sample_rate: int = 22050,
        gain: Optional[float] = None,
        ppm: Optional[int] = None,
        modulation: str = "fm",
        squelch: Optional[int] = None
    ) -> list[str]:
        """
        Build SoapySDR rx_fm command for FM demodulation.

        For pager decoding and iridium capture with LimeSDR.
        """
        device_str = self._build_device_string(device)

        cmd = [
            'rx_fm',
            '-d', device_str,
            '-f', f'{frequency_mhz}M',
            '-M', modulation,
            '-s', str(sample_rate),
        ]

        if gain is not None and gain > 0:
            # LimeSDR gain is applied to LNAH element
            cmd.extend(['-g', f'LNAH={int(gain)}'])

        if squelch is not None and squelch > 0:
            cmd.extend(['-l', str(squelch)])

        # Output to stdout
        cmd.append('-')

        return cmd

    def build_adsb_command(
        self,
        device: SDRDevice,
        gain: Optional[float] = None
    ) -> list[str]:
        """
        Build dump1090 command with SoapySDR support for ADS-B decoding.

        Uses dump1090 compiled with SoapySDR support, or readsb as alternative.
        Note: Requires dump1090 with SoapySDR support or readsb.
        """
        device_str = self._build_device_string(device)

        # Try readsb first (better SoapySDR support), fallback to dump1090
        cmd = [
            'readsb',
            '--net',
            '--device-type', 'soapysdr',
            '--device', device_str,
            '--quiet'
        ]

        if gain is not None:
            cmd.extend(['--gain', str(int(gain))])

        return cmd

    def build_ism_command(
        self,
        device: SDRDevice,
        frequency_mhz: float = 433.92,
        gain: Optional[float] = None,
        ppm: Optional[int] = None
    ) -> list[str]:
        """
        Build rtl_433 command with SoapySDR support for ISM band decoding.

        rtl_433 has native SoapySDR support via -d flag.
        """
        device_str = self._build_device_string(device)

        cmd = [
            'rtl_433',
            '-d', device_str,
            '-f', f'{frequency_mhz}M',
            '-F', 'json'
        ]

        if gain is not None and gain > 0:
            cmd.extend(['-g', str(int(gain))])

        # PPM not typically needed for LimeSDR (TCXO)
        # but include if specified
        if ppm is not None and ppm != 0:
            cmd.extend(['-p', str(ppm)])

        return cmd

    def get_capabilities(self) -> SDRCapabilities:
        """Return LimeSDR capabilities."""
        return self.CAPABILITIES

    @classmethod
    def get_sdr_type(cls) -> SDRType:
        """Return SDR type."""
        return SDRType.LIME_SDR