#!/usr/bin/python3

import os

import numpy as np


def _reciprocal_box(box):
    rbox = np.linalg.inv(box)
    rbox = rbox.T
    return rbox


def _make_pwmat_kp_mp(kpoints):
    ret = ""
    ret += "%d %d %d 0 0 0 " % (kpoints[0], kpoints[1], kpoints[2])
    return ret


def _make_kspacing_kpoints(config, kspacing):
    with open(config, "r") as fp:
        lines = fp.read().split("\n")
    box = []
    for idx, ii in enumerate(lines):
        if "lattice" in ii or "Lattice" in ii or "LATTICE" in ii:
            for kk in range(idx + 1, idx + 1 + 3):
                vector = [float(jj) for jj in lines[kk].split()[0:3]]
                box.append(vector)
            box = np.array(box)
            rbox = _reciprocal_box(box)
    kpoints = [
        (np.ceil(2 * np.pi * np.linalg.norm(ii) / kspacing).astype(int)) for ii in rbox
    ]
    ret = _make_pwmat_kp_mp(kpoints)
    return ret


def make_pwmat_input_dict(
    node1,
    node2,
    atom_config,
    ecut,
    e_error,
    rho_error,
    icmix=None,
    smearing=None,
    sigma=None,
    kspacing=0.5,
    flag_symm=None,
):
    input_dict = {}
    input_dict["node1"] = node1
    input_dict["node2"] = node2
    input_dict["in.atom"] = atom_config
    input_dict["ecut"] = ecut
    input_dict["e_error"] = e_error
    input_dict["rho_error"] = rho_error
    if icmix is not None:
        if sigma is not None:
            if smearing is not None:
                SCF_ITER0_1 = "6 4 3 0.0000 " + str(sigma) + " " + str(smearing)
                SCF_ITER0_2 = (
                    "94 4 3 " + str(icmix) + " " + str(sigma) + " " + str(smearing)
                )
            else:
                SCF_ITER0_1 = "6 4 3 0.0000 " + str(simga) + " 2"
                SCF_ITER0_2 = "94 4 3 " + str(icmix) + " " + str(simga) + " 2"

        else:
            if smearing is not None:
                SCF_ITER0_1 = "6 4 3 0.0000 0.025 " + str(smearing)
                SCF_ITER0_2 = "94 4 3 " + str(icmix) + " 0.025 " + str(smearing)
            else:
                SCF_ITER0_1 = "6 4 3 0.0000 0.025 2"
                SCF_ITER0_2 = "94 4 3 " + str(icmix) + " 0.025 2"
    else:
        if sigma is not None:
            if smearing is not None:
                SCF_ITER0_1 = "6 4 3 0.0000 " + str(sigma) + " " + str(smearing)
                SCF_ITER0_2 = "94 4 3 1.0000 " + str(sigma) + " " + str(smearing)
            else:
                SCF_ITER0_1 = "6 4 3 0.0000 " + str(sigma) + " 2"
                SCF_ITER0_2 = "94 4 3 1.0000 " + str(sigma) + " 2"
        else:
            if smearing is not None:
                SCF_ITER0_1 = "6 4 3 0.0000 0.025 " + str(smearing)
                SCF_ITER0_2 = "94 4 3 1.0000 0.025 " + str(smearing)
            else:
                SCF_ITER0_1 = "6 4 3 0.0000 0.025 2"
                SCF_ITER0_2 = "94 4 3 1.0000 0.025 2"
    input_dict["scf_iter0_1"] = SCF_ITER0_1
    input_dict["scf_iter0_2"] = SCF_ITER0_2
    if flag_symm is not None:
        MP_N123 = _make_kspacing_kpoints(atom_config, kspacing)
        MP_N123 += str(flag_symm)
    else:
        MP_N123 = _make_kspacing_kpoints(atom_config, kspacing)
    input_dict["mp_n123"] = MP_N123
    input_dict["out.wg"] = "F"
    input_dict["out.rho"] = "F"
    input_dict["out.mlmd"] = "T\n"
    return input_dict


def _update_input_dict(input_dict_, user_dict):
    if user_dict is None:
        return input_dict_
    input_dict = input_dict_
    for ii in user_dict:
        input_dict[ci] = user_dict[ii]
    return input_dict


def write_input_dict(input_dict):
    lines = []
    for key in input_dict:
        if type(input_dict[key]) == bool:
            if input_dict[key]:
                rs = "T"
            else:
                rs = "F"
        else:
            rs = str(input_dict[key])
        lines.append("%s=%s" % (key, rs))
    return "\n".join(lines)


def _make_smearing(fp_params):
    icmix = None
    smearing = None
    sigma = None
    if "icmix" in fp_params:
        icmix = fp_params["icmix"]
    if "smearing" in fp_params:
        smearing = fp_params["smearing"]
    if "sigma" in fp_params:
        sigma = fp_params["sigma"]
    if icmix == None:
        if smearing == None:
            if sigma == None:
                return None, None, None
            else:
                return None, None, sigma
        else:
            if sigma == None:
                return None, smearing, None
            else:
                return None, smearing, sigma
    else:
        if smearing == None:
            if sigma == None:
                return icmix, None, None
            else:
                return icmix, None, sigma
        else:
            if sigma == None:
                return icmix, smearing, None
            else:
                return icmix, smearing, sigma


def _make_flag_symm(fp_params):
    flag_symm = None
    if "flag_symm" in fp_params:
        flag_symm = fp_params["flag_symm"]
    if flag_symm == "NONE":
        flag_symm = None
    elif str(flag_symm) not in [None, "0", "1", "2", "3"]:
        raise RuntimeError("unknow flag_symm type " + str(flag_symm))
    return flag_symm


def make_pwmat_input_user_dict(fp_params):
    node1 = fp_params["node1"]
    node2 = fp_params["node2"]
    atom_config = fp_params["in.atom"]
    ecut = fp_params["ecut"]
    e_error = fp_params["e_error"]
    rho_error = fp_params["rho_error"]
    kspacing = fp_params["kspacing"]
    if "user_pwmat_params" in fp_params:
        user_dict = fp_params["user_pwmat_params"]
    else:
        user_dict = None
    icmix, smearing, sigma = _make_smearing(fp_params)
    flag_symm = _make_flag_symm(fp_params)
    input_dict = make_pwmat_input_dict(
        node1,
        node2,
        atom_config,
        ecut,
        e_error,
        rho_error,
        icmix=icmix,
        smearing=smearing,
        sigma=sigma,
        kspacing=kspacing,
        flag_symm=flag_symm,
    )
    input_dict = _update_input_dict(input_dict, user_dict)
    input = write_input_dict(input_dict)
    return input


def input_upper(dinput):
    standard_input = {}
    for key, val in dinput.items():
        standard_input[key.upper()] = val
    return Input(standard_input)
