import os
import shutil
import yaml
import galsim
import numpy as np
from astropy.time import Time

from observation_sim.config._util import get_obs_id
import observation_sim.instruments._util as _util


class Pointing(object):
    def __init__(self, id=0, ra=0., dec=0., img_pa=0., timestamp=1621915200, sat_x=0., sat_y=0., sat_z=0., sun_x=0., sun_y=0., sun_z=0., sat_vx=0., sat_vy=0., sat_vz=0., exp_time=150., pointing_type='SCI', pointing_type_code='101', pointing_id='00000001', obs_config_file=None, t_shutter_open=1.3, t_shutter_close=1.3):
        self.id = id
        self.ra = ra
        self.dec = dec
        self.img_pa = img_pa * galsim.degrees
        self.timestamp = timestamp
        self.sat_x, self.sat_y, self.sat_z = sat_x, sat_y, sat_z
        self.sun_x, self.sun_y, self.sun_z = sun_x, sun_y, sun_z
        self.sat_vx, self.sat_vy, self.sat_vz = sat_vx, sat_vy, sat_vz
        self.exp_time = exp_time
        self.pointing_type = pointing_type
        self.pointing_type_code = pointing_type_code
        self.obs_id = pointing_id
        self.survey_field_type = 'WIDE'
        self.jdt = 0.
        self.obs_config_file = obs_config_file
        self.t_shutter_open = t_shutter_open
        self.t_shutter_close = t_shutter_close
        self.output_dir = "."
        if self.obs_config_file is not None:
            with open(self.obs_config_file, "r") as stream:
                try:
                    self.obs_param = yaml.safe_load(stream)
                except yaml.YAMLError as exc:
                    print(exc)
            if self.obs_param["obs_type"]:
                self.pointing_type = self.obs_param["obs_type"]
            if self.obs_param["obs_type_code"]:
                self.pointing_type_code = self.obs_param["obs_type_code"]
            if self.obs_param["obs_id"]:
                self.obs_id = str(self.obs_param["obs_id"])

    def get_full_depth_exptime(self, filter_type):
        if self.survey_field_type == 'WIDE':
            if filter_type in _util.SPEC_FILTERS:
                return 150. * 4
            else:
                if filter_type.lower() in ['nuv', 'y']:
                    return 150. * 4
                elif filter_type.lower() in ['u', 'g', 'r', 'i', 'z']:
                    return 150. * 2
                else:
                    return max(150., self.exp_time)  # [TODO] for FGS
        elif self.survey_field_type == 'DEEP':
            if filter_type in _util.SPEC_FILTERS:
                return 250. * 4 * 4
            else:
                if filter_type.lower() in ['nuv', 'y']:
                    return 250. * 4 * 4
                elif filter_type.lower() in ['u', 'g', 'r', 'i', 'z']:
                    return 250. * 2 * 4
                else:
                    return max(150., self.exp_time)  # [TODO] for FGS

    def read_pointing_columns(self, columns, id=0, t=1621915200, pointing_type='SCI'):
        self.id = id
        col_len = len(columns)
        self.ra = float(columns[0])
        self.dec = float(columns[1])
        self.img_pa = float(columns[4]) * galsim.degrees
        # self.pointing_type = pointing_type
        if col_len > 5:
            jdt = np.double(columns[5])
            t_temp = Time(jdt, format='jd')
            self.jdt = jdt
            self.timestamp = t_temp.unix
            self.sat_x = float(columns[6])
            self.sat_y = float(columns[7])
            self.sat_z = float(columns[8])
            self.sun_x = float(columns[9])
            self.sun_y = float(columns[10])
            self.sun_z = float(columns[11])
            self.sat_vx = float(columns[15])
            self.sat_vy = float(columns[16])
            self.sat_vz = float(columns[17])
            self.exp_time = float(columns[18])
            is_deep = float(columns[19])
            # [TODO] Can also define other survey types
            if is_deep == 2:
                self.survey_field_type = "DEEP"

            if not self.obs_config_file:
                self.obs_config_file = str(columns[20])
                with open(self.obs_config_file, "r") as stream:
                    try:
                        self.obs_param = yaml.safe_load(stream)
                    except yaml.YAMLError as exc:
                        print(exc)

            self.pointing_type_code = columns[21][0:3]
            self.obs_id = columns[21][3:]

            self.pointing_type = self.obs_param["obs_type"]
        else:
            self.timestamp = t

    def make_output_pointing_dir(self, overall_config, copy_obs_config=False):
        run_dir = os.path.join(
            overall_config["work_dir"], overall_config["run_name"])
        if not os.path.exists(run_dir):
            try:
                os.makedirs(run_dir, exist_ok=True)
            except OSError:
                pass
        self.output_prefix = get_obs_id(
            img_type=self.pointing_type,
            project_cycle=overall_config["project_cycle"],
            run_counter=overall_config["run_counter"],
            pointing_id=self.obs_id,
            pointing_type_code=self.pointing_type_code)
        self.output_dir = os.path.join(run_dir, self.output_prefix)
        if not os.path.exists(self.output_dir):
            try:
                os.makedirs(self.output_dir, exist_ok=True)
            except OSError:
                pass
        if copy_obs_config and self.obs_config_file:
            obs_config_output_path = os.path.join(
                self.output_dir, os.path.basename(self.obs_config_file))
            if not os.path.exists(obs_config_output_path):
                try:
                    shutil.copy(self.obs_config_file, self.output_dir)
                except OSError:
                    pass