import os
from glob import glob

import numpy as np

import pvl
import spiceypy as spice
from ale.base import Driver
from ale.base.data_naif import NaifSpice
from ale.base.data_isis import IsisSpice
from ale.base.label_pds3 import Pds3Label
from ale.base.label_isis import IsisLabel
from ale.base.type_distortion import RadialDistortion, NoDistortion
from ale.base.type_sensor import Framer

from ale.rotation import ConstantRotation
from ale.transformation import FrameChain
from scipy.spatial.transform import Rotation

id_lookup = {
    "ISSNA" : "CASSINI_ISS_NAC",
    "ISSWA" : "CASSINI_ISS_WAC"
}

name_lookup = {
    "ISSNA" : "Imaging Science Subsystem Narrow Angle Camera",
    "ISSWA" : "Imaging Science Subsystem Wide Angle Camera"
}

nac_filter_to_focal_length = {
    ("P0","BL2"):2002.19,
    ("P0","CB1"):2002.30,
    ("P0","GRN"):2002.38,
    ("P0","IR1"):2002.35,
    ("P0","MT1"):2002.40,
    ("P0","UV3"):2002.71,
    ("P60","BL2"):2002.13,
    ("P60","CB1"):2002.18,
    ("P60","GRN"):2002.28,
    ("P60","IR1"):2002.36,
    ("P60","MT1"):2002.34,
    ("P60","UV3"):2002.51,
    ("RED","GRN"):2002.61,
    ("RED","IR1"):2002.48,
    ("UV1","CL2"):2003.03,
    ("UV2","CL2"):2002.91,
    ("UV2","UV3"):2002.90,
    ("RED","CL2"):2002.69,
    ("CL1","IR3"):2002.65,
    ("CL1","BL2"):2002.37,
    ("CL1","CB1"):2002.66,
    ("CL1","CB2"):2002.66,
    ("CL1","CB3"):2002.68,
    ("CL1","MT1"):2002.88,
    ("CL1","MT2"):2002.91,
    ("CL1","MT3"):2002.87,
    ("CL1","UV3"):2003.09,
    ("HAL","CL2"):2002.94,
    ("IR2","CL2"):2002.71,
    ("IR2","IR1"):2002.56,
    ("IR2","IR3"):2002.55,
    ("IR4","CL2"):2002.89,
    ("IR4","IR3"):2002.81,
    ("BL1","CL2"):2002.79,
    ("CL1","CL2"):2002.88,
    ("CL1","GRN"):2002.75,
    ("CL1","IR1"):2002.74,
    ("IRP0","CB2"):2002.48,
    ("IRP0","CB3"):2002.74,
    ("IRP0","IR1"):2002.60,
    ("IRP0","IR3"):2002.48,
    ("IRP0","MT2"):2002.72,
    ("IRP0","MT3"):2002.72,
    ("P120","BL2"):2002.11,
    ("P120","CB1"):002.28,
    ("P120","GRN"):2002.38,
    ("P120","IR1"):2002.39,
    ("P120","MT1"):2002.54,
    ("P120","UV3"):2002.71
}

wac_filter_to_focal_length = {
    ("B2","CL2"):200.85,
    ("B2","IRP90"):200.83,
    ("B2","IRP0"):200.82,
    ("B3","CL2"):201.22,
    ("B3","IRP90"):201.12,
    ("B3","IRP0"):201.11,
    ("L1","BL1"):200.86,
    ("L1","CL2"):200.77,
    ("L1","GRN"):200.71,
    ("L1","HAL"):200.74,
    ("L1","IR1"):200.80,
    ("L1","RED"):200.74,
    ("L1","VIO"):201.09,
    ("R2","CL2"):200.97,
    ("R2","IR"):200.95,
    ("R2","IRP90"):200.95,
    ("R3","CL2"):201.04,
    ("R3","IRP90"):201.03,
    ("R3","IRP0"):201.04,
    ("R4","CL2"):201.22,
    ("R4","IRP90"):201.16,
    ("R4","IRP0"):201.15,
    ("T2","CL2"):200.82,
    ("T2","IRP0"):200.81,
    ("T2","IRP90"):200.82,
    ("T3","CL2"):201.04,
    ("T3","IRP0"):201.06,
    ("T3","IRP90"):201.07
}

class CassiniIssPds3LabelNaifSpiceDriver(Framer, Pds3Label, NaifSpice, RadialDistortion, Driver):
    """
    Cassini mixin class for defining Spice calls.
    """


    @property
    def instrument_id(self):
        """
        Returns an instrument id for unquely identifying the instrument, but often
        also used to be piped into Spice Kernels to acquire instrument kernel (IK) NAIF IDs.
        Therefore they use the same NAIF ID asin bods2c calls. Expects instrument_id to be
        defined from a mixin class. This should return a string containing either 'ISSNA' or
        'ISSWA'

        Returns
        -------
        : str
          instrument id
        """
        return id_lookup[super().instrument_id]

    @property
    def focal_epsilon(self):
        """
        Expects ikid to be defined. This should be an integer containing the Naif
        ID code of the instrument

        Returns
        -------
        : float
          focal epsilon
        """
        return float(spice.gdpool('INS{}_FL_UNCERTAINTY'.format(self.ikid), 0, 1)[0])

    @property
    def spacecraft_name(self):
        """
        Spacecraft name used in various Spice calls to acquire
        ephemeris data.

        Returns
        -------
        : str
          Name of the spacecraft
        """
        return 'CASSINI'

    @property
    def focal2pixel_samples(self):
        """
        Expects ikid to be defined. This should be an integer containing the Naif
        ID code of the instrument

        Returns
        -------
        : list<double>
          focal plane to detector samples
        """
        # Microns to mm
        pixel_size = spice.gdpool('INS{}_PIXEL_SIZE'.format(self.ikid), 0, 1)[0] * 0.001
        return [0.0, 1/pixel_size, 0.0]

    @property
    def focal2pixel_lines(self):
        """
        Expects ikid to be defined. This should be an integer containing the Naif
        ID code of the instrument

        Returns
        -------
        : list<double>
          focal plane to detector lines
        """
        pixel_size = spice.gdpool('INS{}_PIXEL_SIZE'.format(self.ikid), 0, 1)[0] * 0.001
        return [0.0, 0.0, 1/pixel_size]

    @property
    def odtk(self):
        """
        The radial distortion coeffs are not defined in the ik kernels, instead
        they are defined in the ISS Data User Guide (Knowles). Therefore, we
        manually specify the codes here.
        Expects instrument_id to be defined. This should be a string containing either
        CASSINI_ISS_WAC or CASSINI_ISIS_NAC

        Returns
        -------
        : list<float>
          radial distortion coefficients
        """
        if self.instrument_id == 'CASSINI_ISS_WAC':
            # WAC
            return [0, float('-6.2e-5'), 0]
        elif self.instrument_id == 'CASSINI_ISS_NAC':
            # NAC
            return [0, float('-8e-6'), 0]

    @property
    # FOV_CENTER_PIXEL doesn't specify which coordinate is sample or line, but they are the same
    # number, so the order doesn't matter
    def detector_center_line(self):
        """
        Dectector center based on ISIS's corrected values.

        Returns
        -------
        : int
          The detector line of the principle point
        """
        return 512

    @property
    # FOV_CENTER_PIXEL doesn't specify which coordinate is sample or line, but they are the same
    # number, so the order doesn't matter
    def detector_center_sample(self):
        """
        Dectector center based on ISIS's corrected values.

        Returns
        -------
        : int
          The detector sample of the principle point
        """
        return 512

    @property
    def sensor_model_version(self):
        """
        Returns instrument model version

        Returns
        -------
        : int
          ISIS sensor model version
        """
        return 1

    @property
    def focal_length(self):
        """
        NAC uses multiple filter pairs, each filter combination has a different focal length.
        NAIF's Cassini kernels do not contain focal lengths for NAC filters and
        so we aquired updated NAC filter data from ISIS's IAK kernel.

        """
        # default focal defined by IK kernel
        try:
            default_focal_len = super(CassiniIssPds3LabelNaifSpiceDriver, self).focal_length
        except:
            default_focal_len = float(spice.gdpool('INS{}_FOV_CENTER_PIXEL'.format(self.ikid), 0, 2)[0])

        filters = tuple(self.label['FILTER_NAME'])

        if self.instrument_id == "CASSINI_ISS_NAC":
          return nac_filter_to_focal_length.get(filters, default_focal_len)

        elif self.instrument_id == "CASSINI_ISS_WAC":
          return wac_filter_to_focal_length.get(filters, default_focal_len)

    @property
    def _original_naif_sensor_frame_id(self):
        """
        Original sensor frame ID as defined in Cassini's IK kernel. This
        is the frame ID you want to default to for WAC. For NAC, this Frame ID
        sits between J2000 and an extra 180 rotation since NAC was mounted
        upside down.

        Returns
        -------
        : int
          sensor frame code from NAIF's IK kernel
        """
        return self.ikid

    @property
    def sensor_frame_id(self):
        """
        Overwrite sensor frame id to return fake frame ID for NAC representing a
        mounting point with a 180 degree rotation. ID was taken from ISIS's IAK
        kernel for Cassini. This is because NAC requires an extra rotation not
        in NAIF's Cassini kernels. Wac does not require an extra rotation so
        we simply return original sensor frame id for Wac.

        Returns
        -------
        : int
          NAIF's Wac sensor frame ID, or ALE's Nac sensor frame ID
        """
        if self.instrument_id == "CASSINI_ISS_NAC":
          return 14082360
        elif self.instrument_id == "CASSINI_ISS_WAC":
          return 14082361

    @property
    def frame_chain(self):
        """
        Construct the initial frame chain using the original sensor_frame_id
        obtained from the ikid. Then tack on the ISIS iak rotation.

        Returns
        -------
        : Object
          Custom Cassini ALE Frame Chain object for rotation computation and application
        """
        if not hasattr(self, '_frame_chain'):

            try:
                # Call frinfo to check if the ISIS iak has been loaded with the
                # additional reference frame. Otherwise, Fail and add it manually
                spice.frinfo(self.sensor_frame_id)
                self._frame_chain = super().frame_chain
            except spice.utils.exceptions.NotFoundError as e:
                self._frame_chain = FrameChain.from_spice(sensor_frame=self._original_naif_sensor_frame_id,
                                                          target_frame=self.target_frame_id,
                                                          center_ephemeris_time=self.center_ephemeris_time,
                                                          ephemeris_times=self.ephemeris_time,)

                rotation = ConstantRotation([[0, 0, 1, 0]], self.sensor_frame_id, self._original_naif_sensor_frame_id)

                self._frame_chain.add_edge(rotation=rotation)

        return self._frame_chain

class CassiniIssIsisLabelIsisSpiceDriver(Framer, IsisLabel, IsisSpice, NoDistortion, Driver):

    @property
    def instrument_id(self):
        """
        Returns the ID of the instrument

        Returns
        -------
        : str
          ID of the sensor
        """
        return id_lookup[super().instrument_id]

    @property
    def sensor_name(self):
        """
        Returns the name of the instrument

        Returns
        -------
        : str
          Name of the sensor
        """
        return name_lookup[super().instrument_id]

    @property
    def center_ephemeris_time(self):
        """
        Returns the middle exposure time for the image in ephemeris seconds.

        This is overriden because the ISIS ISSNAC and ISSWAC sensor models use the
        label utc times so the converted times are not available in the
        NaifKeywords. Instead we get it from the tables.

        Returns
        -------
        : float
        """
        return self.inst_position_table['SpkTableStartTime']
