#!/usr/bin/env python

## \file functions.py
#  \brief python package for functions
#  \author T. Lukaczyk, F. Palacios
#  \version 7.5.1 "Blackbird"
#
# SU2 Project Website: https://su2code.github.io
#
# The SU2 Project is maintained by the SU2 Foundation
# (http://su2foundation.org)
#
# Copyright 2012-2023, SU2 Contributors (cf. AUTHORS.md)
#
# SU2 is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# SU2 is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with SU2. If not, see <http://www.gnu.org/licenses/>.

# ----------------------------------------------------------------------
#  Imports
# ----------------------------------------------------------------------

import os, sys, shutil, copy, time, subprocess
from .. import run  as su2run
from .. import io   as su2io
from .. import util as su2util
from ..io import redirect_folder, redirect_output


# ----------------------------------------------------------------------
#  Main Function Interface
# ----------------------------------------------------------------------

def function( func_name, config, state=None ):
    """ val = SU2.eval.func(func_name,config,state=None)

        Evaluates the aerodynamics and geometry functions.

        Wraps:
            SU2.eval.aerodynamics()
            SU2.eval.geometry()

        Assumptions:
            Config is already setup for deformation.
            Mesh need not be deformed.
            Updates config and state by reference.
            Redundancy if state.FUNCTIONS is not empty.

        Executes in:
            ./DIRECT or ./GEOMETRY

        Inputs:
            func_name - SU2 objective function name or 'ALL'
            config    - an SU2 config
            state     - optional, an SU2 state

        Outputs:
            If func_name is 'ALL', returns a Bunch() of
            functions with keys of objective function names
            and values of objective function floats.
            Otherwise returns a float.
    """

    # initialize
    state = su2io.State(state)

    # check for multiple objectives
    multi_objective = (type(func_name)==list)

    # func_name_string is only used to check whether the function has already been evaluated.
    func_name_string = func_name
    if multi_objective:   func_name_string = func_name[0]

    # redundancy check
    if not func_name_string in state['FUNCTIONS']:

        # Aerodynamics
        if multi_objective or func_name == 'ALL':
            aerodynamics( config, state )

        elif func_name in su2io.historyOutFields:
            if su2io.historyOutFields[func_name]['TYPE'] == 'COEFFICIENT' or su2io.historyOutFields[func_name]['TYPE'] == 'D_COEFFICIENT':
                aerodynamics( config, state )

        # Stability
        elif func_name in su2io.optnames_stab:
            stability( config, state )

        # Multipoint
        elif func_name in su2io.optnames_multi:
            multipoint( config, state )

        # Geometry
        elif func_name in su2io.optnames_geo:
            geometry( func_name, config, state )

        else:
            raise Exception('unknown function name, %s. Please check config_template.cfg for updated list of function names' % func_name)

    #: if not redundant

    # prepare output
    if func_name == 'ALL':
        func_out = state['FUNCTIONS']
    elif (multi_objective):
        # If combine_objective is true, use the 'combo' output.
        func_out = state['FUNCTIONS']['COMBO']
    else:
        func_out = state['FUNCTIONS'][func_name]

    if func_name_string in config['OPT_OBJECTIVE']:
        marker = config['OPT_OBJECTIVE'][func_name_string]['MARKER']
        if func_name_string in su2io.per_surface_map:
            name = su2io.per_surface_map[func_name_string]+'_'+marker
            if name in state['FUNCTIONS']:
                func_out = state['FUNCTIONS'][name]


    return copy.deepcopy(func_out)

#: def function()


# ----------------------------------------------------------------------
#  Aerodynamic Functions
# ----------------------------------------------------------------------

def aerodynamics( config, state=None ):
    """ vals = SU2.eval.aerodynamics(config,state=None)

        Evaluates aerodynamics with the following:
	          SU2.run.deform()
            SU2.run.direct()

        Assumptions:
            Config is already setup for deformation.
            Mesh may or may not be deformed.
            Updates config and state by reference.
            Redundancy if state.FUNCTIONS is not empty.

        Executes in:
            ./DIRECT

        Inputs:
            config    - an SU2 config
            state     - optional, an SU2 state

        Outputs:
            Bunch() of functions with keys of objective function names
            and values of objective function floats.
    """

    # ----------------------------------------------------
    #  Initialize
    # ----------------------------------------------------

    # initialize
    state = su2io.State(state)

    # Make sure to output aerodynamic coeff.
    if not 'AERO_COEFF' in config['HISTORY_OUTPUT']:
        config['HISTORY_OUTPUT'].append('AERO_COEFF')

    if not 'MESH' in state.FILES:
        state.FILES.MESH = config['MESH_FILENAME']
    special_cases = su2io.get_specialCases(config)

    # console output
    if config.get('CONSOLE','VERBOSE') in ['QUIET','CONCISE']:
        log_direct = 'log_Direct.out'
    else:
        log_direct = None

    # ----------------------------------------------------
    #  Update Mesh
    # ----------------------------------------------------

    # does decomposition and deformation
    info = update_mesh(config,state)

    # ----------------------------------------------------
    #  Adaptation (not implemented)
    # ----------------------------------------------------

    #if not state.['ADAPTED_FUNC']:
    #    config = su2run.adaptation(config)
    #    state['ADAPTED_FUNC'] = True

    # ----------------------------------------------------
    #  Direct Solution
    # ----------------------------------------------------
    opt_names = []
    for key in su2io.historyOutFields:
        if su2io.historyOutFields[key]['TYPE'] == 'COEFFICIENT':
            opt_names.append(key)

    # redundancy check
    direct_done = all([key in state.FUNCTIONS for key in opt_names])
    if direct_done:
        # return aerodynamic function values
        aero = su2util.ordered_bunch()
        for key in opt_names:
            if key in state.FUNCTIONS:
                aero[key] = state.FUNCTIONS[key]
        return copy.deepcopy(aero)
    #: if redundant

    # files to pull
    files = state.FILES
    pull = []; link = []

    # files: mesh
    name = files['MESH']
    name = su2io.expand_part(name,config)
    link.extend(name)

    pull.extend(config.get('CONFIG_LIST',[]))

    # files: restarts
    if config.get('TIME_DOMAIN', 'NO') == 'YES' and config.get('RESTART_SOL','NO') =='YES':
        if  'RESTART_FILE_1' in files: # not the case for directdiff restart
            name = files['RESTART_FILE_1']
            name = su2io.expand_part(name, config)
            link.extend(name)
        if 'RESTART_FILE_2' in files:  # not the case for 1st order time stepping
            name = files['RESTART_FILE_2']
            name = su2io.expand_part(name, config)
            link.extend(name)

    if 'FLOW_META' in files:
        pull.append(files['FLOW_META'])

    # files: direct solution
    if 'DIRECT' in files:
        name = files['DIRECT']
        name = su2io.expand_zones(name, config)
        name = su2io.expand_time(name,config)
        link.extend( name )
        ##config['RESTART_SOL'] = 'YES' # don't override config file
    else:
        if config.get('TIME_DOMAIN', 'NO') != 'YES': #rules out steady state optimization special cases.
            config['RESTART_SOL'] = 'NO' #for shape optimization with restart files.

    # files: target equivarea distribution
    if ( 'EQUIV_AREA' in special_cases and
         'TARGET_EA' in files ) :
        pull.append( files['TARGET_EA'] )

    # files: target pressure distribution
    if ( 'INV_DESIGN_CP' in special_cases and
         'TARGET_CP' in files ) :
        pull.append( files['TARGET_CP'] )

    # files: target heat flux distribution
    if ( 'INV_DESIGN_HEATFLUX' in special_cases and
         'TARGET_HEATFLUX' in files ) :
        pull.append( files['TARGET_HEATFLUX'] )


    # output redirection
    with redirect_folder( 'DIRECT', pull, link ) as push:
        with redirect_output(log_direct):

            # # RUN DIRECT SOLUTION # #
            info = su2run.direct(config)



            konfig = copy.deepcopy(config)
            '''
            If the time convergence criterion was activated, we have less time iterations.
            Store the changed values of TIME_ITER, ITER_AVERAGE_OBJ and UNST_ADJOINT_ITER in
            info.WND_CAUCHY_DATA'''
            if konfig.get('WINDOW_CAUCHY_CRIT', 'NO') == 'YES' and konfig.TIME_MARCHING != 'NO':  # Tranfer Convergence Data, if necessary
                konfig['TIME_ITER']         = info.WND_CAUCHY_DATA['TIME_ITER']
                konfig['ITER_AVERAGE_OBJ']  = info.WND_CAUCHY_DATA['ITER_AVERAGE_OBJ']
                konfig['UNST_ADJOINT_ITER'] = info.WND_CAUCHY_DATA['UNST_ADJOINT_ITER']

            su2io.restart2solution(konfig,info)
            state.update(info)

            # direct files to push
            name = info.FILES['DIRECT']
            name = su2io.expand_zones(name,konfig)
            name = su2io.expand_time(name,konfig)
            push.extend(name)

            # pressure files to push
            if 'TARGET_CP' in info.FILES:
                push.append(info.FILES['TARGET_CP'])

            # heat flux files to push
            if 'TARGET_HEATFLUX' in info.FILES:
                push.append(info.FILES['TARGET_HEATFLUX'])

            if 'FLOW_META' in info.FILES:
                push.append(info.FILES['FLOW_META'])

    #: with output redirection
    su2io.update_persurface(konfig,state)
    # return output
    funcs = su2util.ordered_bunch()
    for key in state['FUNCTIONS']:
            funcs[key] = state['FUNCTIONS'][key]

    return funcs

#: def aerodynamics()


# ----------------------------------------------------------------------
#  Stability Functions
# ----------------------------------------------------------------------

def stability( config, state=None, step=1e-2 ):


    folder = 'STABILITY' # os.path.join('STABILITY',func_name) #STABILITY/D_MOMENT_Y_D_ALPHA/

    # ----------------------------------------------------
    #  Initialize
    # ----------------------------------------------------

    # initialize
    state = su2io.State(state)
    if not 'MESH' in state.FILES:
        state.FILES.MESH = config['MESH_FILENAME']
    special_cases = su2io.get_specialCases(config)

    # console output
    if config.get('CONSOLE','VERBOSE') in ['QUIET','CONCISE']:
        log_direct = 'log_Direct.out'
    else:
        log_direct = None

    # ----------------------------------------------------
    #  Update Mesh
    # ----------------------------------------------------


    # does decomposition and deformation
    info = update_mesh(config,state)

    # ----------------------------------------------------
    #  CENTRAL POINT
    # ----------------------------------------------------

    # will run in DIRECT/
    func_0 = aerodynamics(config,state)


    # ----------------------------------------------------
    #  Run Forward Point
    # ----------------------------------------------------

    # files to pull
    files = state.FILES
    pull = []; link = []

    # files: mesh
    name = files['MESH']
    name = su2io.expand_part(name,config)
    link.extend(name)

    # files: direct solution
    if 'DIRECT' in files:
        name = files['DIRECT']
        name = su2io.expand_time(name,config)
        link.extend( name )
        ##config['RESTART_SOL'] = 'YES' # don't override config file
    else:
        config['RESTART_SOL'] = 'NO'

    # files: target equivarea distribution
    if ( 'EQUIV_AREA' in special_cases and
         'TARGET_EA' in files ) :
        pull.append( files['TARGET_EA'] )

    # files: target pressure distribution
    if ( 'INV_DESIGN_CP' in special_cases and
         'TARGET_CP' in files ) :
        pull.append( files['TARGET_CP'] )

    # files: target heat flux distribution
    if ( 'INV_DESIGN_HEATFLUX' in special_cases and
         'TARGET_HEATFLUX' in files ) :
        pull.append( files['TARGET_HEATFLUX'] )

    # pull needed files, start folder
    with redirect_folder( folder, pull, link ) as push:
        with redirect_output(log_direct):

            konfig = copy.deepcopy(config)
            ztate  = copy.deepcopy(state)

            # TODO: GENERALIZE
            konfig.AOA = konfig.AOA + step
            ztate.FUNCTIONS.clear()

            func_1 = aerodynamics(konfig,ztate)

            ## direct files to store
            #name = ztate.FILES['DIRECT']
            #if not 'STABILITY' in state.FILES:
                #state.FILES.STABILITY = su2io.ordered_bunch()
            #state.FILES.STABILITY['DIRECT'] = name

            ## equivarea files to store
            #if 'WEIGHT_NF' in ztate.FILES:
                #state.FILES.STABILITY['WEIGHT_NF'] = ztate.FILES['WEIGHT_NF']

    # ----------------------------------------------------
    #  DIFFERENCING
    # ----------------------------------------------------

    for derv_name in su2io.optnames_stab:

        matches = [ k for k in su2io.optnames_aero if k in derv_name ]
        if not len(matches) == 1: continue
        func_name = matches[0]

        obj_func = ( func_1[func_name] - func_0[func_name] ) / step

        state.FUNCTIONS[derv_name] = obj_func


    # return output
    funcs = su2util.ordered_bunch()
    for key in su2io.optnames_stab:
        if key in state['FUNCTIONS']:
            funcs[key] = state['FUNCTIONS'][key]

    return funcs


# ----------------------------------------------------------------------
#  Multipoint Functions
# ----------------------------------------------------------------------

def multipoint( config, state=None, step=1e-2 ):

    mach_list = config['MULTIPOINT_MACH_NUMBER'].replace("(", "").replace(")", "").split(',')
    reynolds_list = config['MULTIPOINT_REYNOLDS_NUMBER'].replace("(", "").replace(")", "").split(',')
    freestream_temp_list = config['MULTIPOINT_FREESTREAM_TEMPERATURE'].replace("(", "").replace(")", "").split(',')
    freestream_press_list = config['MULTIPOINT_FREESTREAM_PRESSURE'].replace("(", "").replace(")", "").split(',')
    aoa_list = config['MULTIPOINT_AOA'].replace("(", "").replace(")", "").split(',')
    sideslip_list = config['MULTIPOINT_SIDESLIP_ANGLE'].replace("(", "").replace(")", "").split(',')
    target_cl_list = config['MULTIPOINT_TARGET_CL'].replace("(", "").replace(")", "").split(',')
    weight_list = config['MULTIPOINT_WEIGHT'].replace("(", "").replace(")", "").split(',')
    outlet_value_list = config['MULTIPOINT_OUTLET_VALUE'].replace("(", "").replace(")", "").split(',')
    solution_flow_list = su2io.expand_multipoint(config.SOLUTION_FILENAME, config)
    flow_meta_list = su2io.expand_multipoint('flow.meta', config)
    restart_sol = config['RESTART_SOL']
    dv_value_old = config['DV_VALUE_OLD'];

    func = []
    folder = []
    for i in range(len(weight_list)):
        func.append(0)
        folder.append(0)

    for i in range(len(weight_list)):
        folder[i] = 'MULTIPOINT_' + str(i)

    opt_names = []
    for key in su2io.historyOutFields:
        if su2io.historyOutFields[key]['TYPE'] == 'COEFFICIENT':
            opt_names.append(key)

    # ----------------------------------------------------
    #  Initialize
    # ----------------------------------------------------

    # initialize
    state = su2io.State(state)
    if not 'MESH' in state.FILES:
        state.FILES.MESH = config['MESH_FILENAME']
    special_cases = su2io.get_specialCases(config)

    # console output
    if config.get('CONSOLE','VERBOSE') in ['QUIET','CONCISE']:
        log_direct = 'log_Direct.out'
    else:
        log_direct = None

    # ----------------------------------------------------
    #  Update Mesh
    # ----------------------------------------------------

    # If multiple meshes specified, use relevant mesh
    if 'MULTIPOINT_MESH_FILENAME' in state.FILES:
        state.FILES.MESH = state.FILES.MULTIPOINT_MESH_FILENAME[0]
        config.MESH_FILENAME = state.FILES.MULTIPOINT_MESH_FILENAME[0]

    # does decomposition and deformation
    info = update_mesh(config,state)

    # ----------------------------------------------------
    #  FIRST POINT
    # ----------------------------------------------------

    # will run in DIRECT/

    config.AOA = aoa_list[0]
    config.SIDESLIP_ANGLE = sideslip_list[0]
    config.MACH_NUMBER = mach_list[0]
    config.REYNOLDS_NUMBER = reynolds_list[0]
    config.FREESTREAM_TEMPERATURE = freestream_temp_list[0]
    config.FREESTREAM_PRESSURE = freestream_press_list[0]
    config.TARGET_CL = target_cl_list[0]
    orig_marker_outlet = config['MARKER_OUTLET']
    orig_marker_outlet = orig_marker_outlet.replace("(", "").replace(")", "").split(',')
    new_marker_outlet = "(" + orig_marker_outlet[0] + "," + outlet_value_list[0] + ")"
    config.MARKER_OUTLET = new_marker_outlet
    config.SOLUTION_FILENAME = solution_flow_list[0]

    # If solution file for the first point is available, use it
    if 'MULTIPOINT_DIRECT' in state.FILES and state.FILES.MULTIPOINT_DIRECT[0]:
        state.FILES['DIRECT'] = state.FILES.MULTIPOINT_DIRECT[0]

    # If flow.meta file for the first point is available, rename it before using it
    if 'MULTIPOINT_FLOW_META' in state.FILES and state.FILES.MULTIPOINT_FLOW_META[0]:
        os.rename(state.FILES.MULTIPOINT_FLOW_META[0], 'flow.meta')
        state.FILES['FLOW_META'] = 'flow.meta'

    func[0] = aerodynamics(config,state)

    # change name of flow.meta back to multipoint name
    if os.path.exists('flow.meta'):
        os.rename('flow.meta', flow_meta_list[0])
        state.FILES['FLOW_META'] = flow_meta_list[0]

    src = os.getcwd()
    src = os.path.abspath(src).rstrip('/')+'/DIRECT/'

    # files to pull
    files = state.FILES
    pull = []; link = []

    # files: mesh
    name = files['MESH']
    name = su2io.expand_part(name,config)
    link.extend(name)

    # files: direct solution
    if 'DIRECT' in files:
        name = files['DIRECT']
        name = su2io.expand_time(name,config)
        link.extend( name )
    else:
        config['RESTART_SOL'] = 'NO'

    # files: meta data for the flow
    if 'FLOW_META' in files:
        pull.append(files['FLOW_META'])

    # files: target equivarea distribution
    if ( 'EQUIV_AREA' in special_cases and
        'TARGET_EA' in files ) :
        pull.append( files['TARGET_EA'] )

    # files: target pressure distribution
    if ( 'INV_DESIGN_CP' in special_cases and
        'TARGET_CP' in files ) :
        pull.append( files['TARGET_CP'] )

    # files: target heat flux distribution
    if ( 'INV_DESIGN_HEATFLUX' in special_cases and
        'TARGET_HEATFLUX' in files ) :
        pull.append( files['TARGET_HEATFLUX'] )

    # pull needed files, start folder_0
    with redirect_folder( folder[0], pull, link ) as push:
        with redirect_output(log_direct):

            konfig = copy.deepcopy(config)
            ztate  = copy.deepcopy(state)
            # Reset restart to original value
            konfig['RESTART_SOL'] = restart_sol

            dst = os.getcwd()
            dst = os.path.abspath(dst).rstrip('/')+'/'+'DIRECT'

            # make unix link
            string = "ln -s " + src + " " + dst
            stringlist = string.split()
            subprocess.Popen(stringlist)

    for i in range(len(weight_list)-1):

        konfig = copy.deepcopy(config)
        ztate  = copy.deepcopy(state)

        konfig.SOLUTION_FILENAME = solution_flow_list[i+1]

        # delete direct solution file from previous point
        if 'DIRECT' in ztate.FILES:
            del ztate.FILES.DIRECT

        if 'FLOW_META' in ztate.FILES:
            del ztate.FILES.FLOW_META

        # use direct solution file from relevant point
        if 'MULTIPOINT_DIRECT' in state.FILES and state.FILES.MULTIPOINT_DIRECT[i+1]:
            ztate.FILES['DIRECT'] = state.FILES.MULTIPOINT_DIRECT[i+1]

        # use flow.meta file from relevant point
        if 'MULTIPOINT_FLOW_META' in state.FILES and state.FILES.MULTIPOINT_FLOW_META[i+1]:
            ztate.FILES['FLOW_META'] = state.FILES.MULTIPOINT_FLOW_META[i+1]

        # use mesh file from relevant point
        if 'MULTIPOINT_MESH_FILENAME' in ztate.FILES:
            ztate.FILES.MESH = ztate.FILES.MULTIPOINT_MESH_FILENAME[i+1]
            konfig.MESH_FILENAME= ztate.FILES.MULTIPOINT_MESH_FILENAME[i+1]
            konfig['DV_VALUE_OLD'] = dv_value_old

        files = ztate.FILES
        link = []
        pull = []

        # files: mesh
        name = files['MESH']
        name = su2io.expand_part(name,konfig)
        link.extend(name)

        # files: direction solution
        if 'DIRECT' in files:
            name = files['DIRECT']
            name = su2io.expand_time(name,konfig)
            link.extend( name )
        else:
            konfig['RESTART_SOL'] = 'NO'

        # files: meta data for the flow
        if 'FLOW_META' in files:
            pull.append(files['FLOW_META'])

        # pull needed files, start folder_1
        with redirect_folder( folder[i+1], pull, link ) as push:
            with redirect_output(log_direct):

                # Perform deformation on multipoint mesh
                if 'MULTIPOINT_MESH_FILENAME' in state.FILES:
                    info = update_mesh(konfig,ztate)

                # Update config values
                konfig.AOA = aoa_list[i+1]
                konfig.SIDESLIP_ANGLE = sideslip_list[i+1]
                konfig.MACH_NUMBER = mach_list[i+1]
                konfig.REYNOLDS_NUMBER = reynolds_list[i+1]
                konfig.FREESTREAM_TEMPERATURE = freestream_temp_list[i+1]
                konfig.FREESTREAM_PRESSURE = freestream_press_list[i+1]
                konfig.TARGET_CL = target_cl_list[i+1]
                orig_marker_outlet = config['MARKER_OUTLET']
                orig_marker_outlet = orig_marker_outlet.replace("(", "").replace(")", "").split(',')
                new_marker_outlet = "(" + orig_marker_outlet[0] + "," + outlet_value_list[i+1] + ")"
                konfig.MARKER_OUTLET = new_marker_outlet

                ztate.FUNCTIONS.clear()

                # rename meta data to flow.meta
                if 'FLOW_META' in ztate.FILES:
                    ztate.FILES['FLOW_META'] = 'flow.meta'
                    os.rename(ztate.FILES.MULTIPOINT_FLOW_META[i+1], 'flow.meta')

                func[i+1] = aerodynamics(konfig,ztate)

                dst = os.getcwd()

                # revert name of flow.meta file to multipoint name
                if os.path.exists('flow.meta'):
                    os.rename('flow.meta', flow_meta_list[i+1])
                    ztate.FILES['FLOW_META'] = flow_meta_list[i+1]
                    dst_flow_meta = os.path.abspath(dst).rstrip('/')+'/'+ztate.FILES['FLOW_META']
                    push.append(ztate.FILES['FLOW_META'])

                # direct files to push
                dst_direct = os.path.abspath(dst).rstrip('/')+'/'+ztate.FILES['DIRECT']
                name = ztate.FILES['DIRECT']
                name = su2io.expand_zones(name,konfig)
                name = su2io.expand_time(name,konfig)
                push.extend(name)

                if 'MULTIPOINT_MESH_FILENAME' in state.FILES:
                    # Mesh files to push
                    dst_mesh = os.path.abspath(dst).rstrip('/')+'/'+ztate.FILES['MESH']
                    name = ztate.FILES['MESH']
                    name = su2io.expand_part(name,konfig)
                    push.extend(name)


        # Link direct solution to MULTIPOINT_# folder
        src = os.getcwd()
        src_direct = os.path.abspath(src).rstrip('/')+'/'+ztate.FILES['DIRECT']

        # make unix link
        os.symlink(src_direct, dst_direct)

        # If the mesh doesn't already exist, link it
        if 'MULTIPOINT_MESH_FILENAME' in state.FILES:
            src_mesh = os.path.abspath(src).rstrip('/')+'/'+ztate.FILES['MESH']
            if not os.path.exists(src_mesh):
                os.symlink(src_mesh, dst_mesh)

        # link flow.meta
        if 'MULTIPOINT_FLOW_META' in state.FILES:
            src_flow_meta = os.path.abspath(src).rstrip('/')+'/'+ztate.FILES['FLOW_META']
            if not os.path.exists(src_flow_meta):
                os.symlink(src_flow_meta, dst_flow_meta)

    # Update MULTIPOINT_DIRECT in state.FILES
    state.FILES.MULTIPOINT_DIRECT = solution_flow_list
    if 'FLOW_META' in state.FILES:
        state.FILES.MULTIPOINT_FLOW_META = flow_meta_list

    # ----------------------------------------------------
    #  WEIGHT FUNCTIONS
    # ----------------------------------------------------

    for derv_name in su2io.optnames_multi:
        matches = [ k for k in opt_names if k in derv_name ]
        if not len(matches) == 1: continue
        func_name = matches[0]
        obj_func = 0.0
        for i in range(len(weight_list)):
            obj_func = obj_func + float(weight_list[i])*func[i][func_name]

        state.FUNCTIONS[derv_name] = obj_func

    # return output
    funcs = su2util.ordered_bunch()
    for key in su2io.optnames_multi:
        if key in state['FUNCTIONS']:
            funcs[key] = state['FUNCTIONS'][key]

    return funcs


# ----------------------------------------------------------------------
#  Geometric Functions
# ----------------------------------------------------------------------

def geometry( func_name, config, state=None ):
    """ val = SU2.eval.geometry(config,state=None)

        Evaluates geometry with the following:
            SU2.run.deform()
            SU2.run.geometry()

        Assumptions:
            Config is already setup for deformation.
            Mesh may or may not be deformed.
            Updates config and state by reference.
            Redundancy if state.FUNCTIONS does not have func_name.

        Executes in:
            ./GEOMETRY

        Inputs:
            config    - an SU2 config
            state     - optional, an SU2 state

        Outputs:
            Bunch() of functions with keys of objective function names
            and values of objective function floats.
    """

    # ----------------------------------------------------
    #  Initialize
    # ----------------------------------------------------

    # initialize
    state = su2io.State(state)
    if not 'MESH' in state.FILES:
        state.FILES.MESH = config['MESH_FILENAME']
    special_cases = su2io.get_specialCases(config)

    # console output
    if config.get('CONSOLE','VERBOSE') in ['QUIET','CONCISE']:
        log_geom = 'log_Geometry.out'
    else:
        log_geom = None

    # ----------------------------------------------------
    #  Update Mesh (check with Trent)
    # ----------------------------------------------------

    # does decomposition and deformation
    #info = update_mesh(config,state)


    # ----------------------------------------------------
    #  Geometry Solution
    # ----------------------------------------------------

    # redundancy check
    geometry_done = func_name in state.FUNCTIONS
    #geometry_done = all([key in state.FUNCTIONS for key in su2io.optnames_geo])
    if not geometry_done:

        # files to pull
        files = state.FILES
        pull = []; link = []

        # files: mesh
        name = files['MESH']
        name = su2io.expand_part(name,config)
        link.extend(name)

        # update function name
        ## TODO

        # output redirection
        with redirect_folder( 'GEOMETRY', pull, link ) as push:
            with redirect_output(log_geom):

                # setup config
                config.GEO_PARAM = func_name
                config.GEO_MODE  = 'FUNCTION'

                # # RUN GEOMETRY SOLUTION # #
                info = su2run.geometry(config)
                state.update(info)

                # no files to push

        #: with output redirection

    #: if not redundant

    # return output
    funcs = su2util.ordered_bunch()
    for key in su2io.optnames_geo:
        if key in state['FUNCTIONS']:
            funcs[key] = state['FUNCTIONS'][key]
    return funcs


#: def geometry()



def update_mesh(config,state=None):
    """ SU2.eval.update_mesh(config,state=None)

        updates mesh with the following:
	          SU2.run.deform()

        Assumptions:
            Config is already setup for deformation.
            Mesh may or may not be deformed.
            Updates config and state by reference.

        Executes in:
            ./DECOMP and ./DEFORM

        Inputs:
            config    - an SU2 config
            state     - optional, an SU2 state

        Outputs:
            nothing

        Modifies:
            config and state by reference
    """

    # ----------------------------------------------------
    #  Initialize
    # ----------------------------------------------------

    # initialize
    state = su2io.State(state)
    if not 'MESH' in state.FILES:
        state.FILES.MESH = config['MESH_FILENAME']
    special_cases = su2io.get_specialCases(config)

    # console output
    if config.get('CONSOLE','VERBOSE') in ['QUIET','CONCISE']:
        log_decomp = 'log_Decomp.out'
        log_deform = 'log_Deform.out'
    else:
        log_decomp = None
        log_deform = None


    # ----------------------------------------------------
    #  Deformation
    # ----------------------------------------------------

    # redundancy check
    deform_set  = config['DV_KIND'] == config['DEFINITION_DV']['KIND']
    deform_todo = not config['DV_VALUE_NEW'] == config['DV_VALUE_OLD']
    if deform_set and deform_todo:

        # files to pull
        pull = []
        link = config['MESH_FILENAME']
        link = su2io.expand_part(link,config)

        pull.extend(config.get('CONFIG_LIST',[]))

        # output redirection
        with redirect_folder('DEFORM',pull,link) as push:
            with redirect_output(log_deform):

                # # RUN DEFORMATION # #
                info = su2run.deform(config)
                state.update(info)

                # data to push
                meshname = info.FILES.MESH
                names = su2io.expand_part( meshname , config )
                push.extend( names )

        #: with redirect output

    elif deform_set and not deform_todo:
        state.VARIABLES.DV_VALUE_NEW = config.DV_VALUE_NEW

    #: if not redundant

    return

