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#!/usr/bin/env python3
"""

Rules for building C/API module with f2py2e.

Copyright 1999,2000 Pearu Peterson all rights reserved,
Pearu Peterson <pearu@ioc.ee>
Permission to use, modify, and distribute this software is given under the
terms of the NumPy License.

NO WARRANTY IS EXPRESSED OR IMPLIED.  USE AT YOUR OWN RISK.
$Date: 2004/11/26 11:13:06 $
Pearu Peterson

"""
import copy

from .auxfuncs import (
    getfortranname, isexternal, isfunction, isfunction_wrap, isintent_in,
    isintent_out, islogicalfunction, ismoduleroutine, isscalar,
    issubroutine, issubroutine_wrap, outmess, show
)

from ._isocbind import isoc_kindmap

def var2fixfortran(vars, a, fa=None, f90mode=None):
    if fa is None:
        fa = a
    if a not in vars:
        show(vars)
        outmess('var2fixfortran: No definition for argument "%s".\n' % a)
        return ''
    if 'typespec' not in vars[a]:
        show(vars[a])
        outmess('var2fixfortran: No typespec for argument "%s".\n' % a)
        return ''
    vardef = vars[a]['typespec']
    if vardef == 'type' and 'typename' in vars[a]:
        vardef = '%s(%s)' % (vardef, vars[a]['typename'])
    selector = {}
    lk = ''
    if 'kindselector' in vars[a]:
        selector = vars[a]['kindselector']
        lk = 'kind'
    elif 'charselector' in vars[a]:
        selector = vars[a]['charselector']
        lk = 'len'
    if '*' in selector:
        if f90mode:
            if selector['*'] in ['*', ':', '(*)']:
                vardef = '%s(len=*)' % (vardef)
            else:
                vardef = '%s(%s=%s)' % (vardef, lk, selector['*'])
        else:
            if selector['*'] in ['*', ':']:
                vardef = '%s*(%s)' % (vardef, selector['*'])
            else:
                vardef = '%s*%s' % (vardef, selector['*'])
    else:
        if 'len' in selector:
            vardef = '%s(len=%s' % (vardef, selector['len'])
            if 'kind' in selector:
                vardef = '%s,kind=%s)' % (vardef, selector['kind'])
            else:
                vardef = '%s)' % (vardef)
        elif 'kind' in selector:
            vardef = '%s(kind=%s)' % (vardef, selector['kind'])

    vardef = '%s %s' % (vardef, fa)
    if 'dimension' in vars[a]:
        vardef = '%s(%s)' % (vardef, ','.join(vars[a]['dimension']))
    return vardef

def useiso_c_binding(rout):
    useisoc = False
    for key, value in rout['vars'].items():
        kind_value = value.get('kindselector', {}).get('kind')
        if kind_value in isoc_kindmap:
            return True
    return useisoc

def createfuncwrapper(rout, signature=0):
    assert isfunction(rout)

    extra_args = []
    vars = rout['vars']
    for a in rout['args']:
        v = rout['vars'][a]
        for i, d in enumerate(v.get('dimension', [])):
            if d == ':':
                dn = 'f2py_%s_d%s' % (a, i)
                dv = dict(typespec='integer', intent=['hide'])
                dv['='] = 'shape(%s, %s)' % (a, i)
                extra_args.append(dn)
                vars[dn] = dv
                v['dimension'][i] = dn
    rout['args'].extend(extra_args)
    need_interface = bool(extra_args)

    ret = ['']

    def add(line, ret=ret):
        ret[0] = '%s\n      %s' % (ret[0], line)
    name = rout['name']
    fortranname = getfortranname(rout)
    f90mode = ismoduleroutine(rout)
    newname = '%sf2pywrap' % (name)

    if newname not in vars:
        vars[newname] = vars[name]
        args = [newname] + rout['args'][1:]
    else:
        args = [newname] + rout['args']

    l_tmpl = var2fixfortran(vars, name, '@@@NAME@@@', f90mode)
    if l_tmpl[:13] == 'character*(*)':
        if f90mode:
            l_tmpl = 'character(len=10)' + l_tmpl[13:]
        else:
            l_tmpl = 'character*10' + l_tmpl[13:]
        charselect = vars[name]['charselector']
        if charselect.get('*', '') == '(*)':
            charselect['*'] = '10'

    l1 = l_tmpl.replace('@@@NAME@@@', newname)
    rl = None

    useisoc = useiso_c_binding(rout)
    sargs = ', '.join(args)
    if f90mode:
        # gh-23598 fix warning
        # Essentially, this gets called again with modules where the name of the
        # function is added to the arguments, which is not required, and removed
        sargs = sargs.replace(f"{name}, ", '')
        args = [arg for arg in args if arg != name]
        rout['args'] = args
        add('subroutine f2pywrap_%s_%s (%s)' %
            (rout['modulename'], name, sargs))
        if not signature:
            add('use %s, only : %s' % (rout['modulename'], fortranname))
        if useisoc:
            add('use iso_c_binding')
    else:
        add('subroutine f2pywrap%s (%s)' % (name, sargs))
        if useisoc:
            add('use iso_c_binding')
        if not need_interface:
            add('external %s' % (fortranname))
            rl = l_tmpl.replace('@@@NAME@@@', '') + ' ' + fortranname

    if need_interface:
        for line in rout['saved_interface'].split('\n'):
            if line.lstrip().startswith('use ') and '__user__' not in line:
                add(line)

    args = args[1:]
    dumped_args = []
    for a in args:
        if isexternal(vars[a]):
            add('external %s' % (a))
            dumped_args.append(a)
    for a in args:
        if a in dumped_args:
            continue
        if isscalar(vars[a]):
            add(var2fixfortran(vars, a, f90mode=f90mode))
            dumped_args.append(a)
    for a in args:
        if a in dumped_args:
            continue
        if isintent_in(vars[a]):
            add(var2fixfortran(vars, a, f90mode=f90mode))
            dumped_args.append(a)
    for a in args:
        if a in dumped_args:
            continue
        add(var2fixfortran(vars, a, f90mode=f90mode))

    add(l1)
    if rl is not None:
        add(rl)

    if need_interface:
        if f90mode:
            # f90 module already defines needed interface
            pass
        else:
            add('interface')
            add(rout['saved_interface'].lstrip())
            add('end interface')

    sargs = ', '.join([a for a in args if a not in extra_args])

    if not signature:
        if islogicalfunction(rout):
            add('%s = .not.(.not.%s(%s))' % (newname, fortranname, sargs))
        else:
            add('%s = %s(%s)' % (newname, fortranname, sargs))
    if f90mode:
        add('end subroutine f2pywrap_%s_%s' % (rout['modulename'], name))
    else:
        add('end')
    return ret[0]


def createsubrwrapper(rout, signature=0):
    assert issubroutine(rout)

    extra_args = []
    vars = rout['vars']
    for a in rout['args']:
        v = rout['vars'][a]
        for i, d in enumerate(v.get('dimension', [])):
            if d == ':':
                dn = 'f2py_%s_d%s' % (a, i)
                dv = dict(typespec='integer', intent=['hide'])
                dv['='] = 'shape(%s, %s)' % (a, i)
                extra_args.append(dn)
                vars[dn] = dv
                v['dimension'][i] = dn
    rout['args'].extend(extra_args)
    need_interface = bool(extra_args)

    ret = ['']

    def add(line, ret=ret):
        ret[0] = '%s\n      %s' % (ret[0], line)
    name = rout['name']
    fortranname = getfortranname(rout)
    f90mode = ismoduleroutine(rout)

    args = rout['args']

    useisoc = useiso_c_binding(rout)
    sargs = ', '.join(args)
    if f90mode:
        add('subroutine f2pywrap_%s_%s (%s)' %
            (rout['modulename'], name, sargs))
        if useisoc:
            add('use iso_c_binding')
        if not signature:
            add('use %s, only : %s' % (rout['modulename'], fortranname))
    else:
        add('subroutine f2pywrap%s (%s)' % (name, sargs))
        if useisoc:
            add('use iso_c_binding')
        if not need_interface:
            add('external %s' % (fortranname))

    if need_interface:
        for line in rout['saved_interface'].split('\n'):
            if line.lstrip().startswith('use ') and '__user__' not in line:
                add(line)

    dumped_args = []
    for a in args:
        if isexternal(vars[a]):
            add('external %s' % (a))
            dumped_args.append(a)
    for a in args:
        if a in dumped_args:
            continue
        if isscalar(vars[a]):
            add(var2fixfortran(vars, a, f90mode=f90mode))
            dumped_args.append(a)
    for a in args:
        if a in dumped_args:
            continue
        add(var2fixfortran(vars, a, f90mode=f90mode))

    if need_interface:
        if f90mode:
            # f90 module already defines needed interface
            pass
        else:
            add('interface')
            for line in rout['saved_interface'].split('\n'):
                if line.lstrip().startswith('use ') and '__user__' in line:
                    continue
                add(line)
            add('end interface')

    sargs = ', '.join([a for a in args if a not in extra_args])

    if not signature:
        add('call %s(%s)' % (fortranname, sargs))
    if f90mode:
        add('end subroutine f2pywrap_%s_%s' % (rout['modulename'], name))
    else:
        add('end')
    return ret[0]


def assubr(rout):
    if isfunction_wrap(rout):
        fortranname = getfortranname(rout)
        name = rout['name']
        outmess('\t\tCreating wrapper for Fortran function "%s"("%s")...\n' % (
            name, fortranname))
        rout = copy.copy(rout)
        fname = name
        rname = fname
        if 'result' in rout:
            rname = rout['result']
            rout['vars'][fname] = rout['vars'][rname]
        fvar = rout['vars'][fname]
        if not isintent_out(fvar):
            if 'intent' not in fvar:
                fvar['intent'] = []
            fvar['intent'].append('out')
            flag = 1
            for i in fvar['intent']:
                if i.startswith('out='):
                    flag = 0
                    break
            if flag:
                fvar['intent'].append('out=%s' % (rname))
        rout['args'][:] = [fname] + rout['args']
        return rout, createfuncwrapper(rout)
    if issubroutine_wrap(rout):
        fortranname = getfortranname(rout)
        name = rout['name']
        outmess('\t\tCreating wrapper for Fortran subroutine "%s"("%s")...\n'
                % (name, fortranname))
        rout = copy.copy(rout)
        return rout, createsubrwrapper(rout)
    return rout, ''
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