# Copyright (c) 2019 Damian Jarek
#
# Use, modification and distribution is subject to the Boost Software
# License Version 1.0. (See accompanying file LICENSE.txt or
# https://www.bfgroup.xyz/b2/LICENSE.txt)

# Supports the openssl library
#
# After 'using openssl', the following targets are available:
#
# /openssl//ssl -- The SSL/TLS library
# /openssl//crypto -- The cryptography library

import project ;
import ac ;
import errors ;
import feature ;
import "class" : new ;
import targets ;
import path ;
import modules ;
import indirect ;
import os ;
import property ;
import property-set ;
import args ;

header = openssl.h ;
ssl_names = ssl ssleay32 ;
crypto_names = crypto libeay32 ;

library-id = 0 ;

.debug =  [ args.get-arg debug-configuration ] ;

# Initializes the openssl library.
#
# openssl can be configured to use pre-existing binaries.
#
# Options for configuring a prebuilt openssl::
#
#   <search>
#       The directory containing the openssl binaries.
#   <ssl-name>
#       Overrides the default name of ssl library.
#   <crypto-name>
#       Overrides the default name of crypto library.
#   <include>
#       The directory containing the openssl headers.
#   <dll-path>
#       Extra directories to add to library search paths of consumers during
#       runtime (multiple instances are allowed).
#
# If none of these options is specified, then the environmental
# variables OPENSSL_LIBRARY_PATH, OPENSSL_NAME, and OPENSSL_INCLUDE will
# be used instead.
#
# Examples::
#
#   # Find openssl in the default system location
#   using openssl ;
#   # Find openssl in /usr/local
#   using openssl : 1.2.7
#     : <include>/usr/local/include <search>/usr/local/lib ;
#
rule init (
    version ?
    # The OpenSSL version (currently ignored)

    : options *
    # A list of the options to use

    : requirements *
    # The requirements for the openssl target

    : is-default ?
    )
{
    local caller = [ project.current ] ;

    if ! $(.initialized)
    {
        .initialized = true ;

        project.initialize $(__name__) ;
        .project = [ project.current ] ;
        project openssl ;
    }

    local library-path = [ feature.get-values <search> : $(options) ] ;
    local include-path = [ feature.get-values <include> : $(options) ] ;
    local ssl-name = [ feature.get-values <ssl-name> : $(options) ] ;
    local crypto-name = [ feature.get-values <crypto-name> : $(options) ] ;
    local dll-paths = [ property.select <dll-path> : $(options) ] ;

    if ! $(library-path) && ! $(include-path) && ! $(source-path) && ! $(ssl-name) && ! $(crypto-name)
    {
        is-default = true ;
    }

    condition = [ property-set.create $(requirements) ] ;
    condition = [ property-set.create [ $(condition).base ] ] ;

    if $(.configured.$(condition))
    {
        if $(is-default)
        {
            if $(.debug)
            {
                ECHO "notice: [openssl] openssl is already configured" ;
            }
        }
        else
        {
            errors.user-error "openssl is already configured" ;
        }
        return ;
    }
    else
    {
        if $(.debug)
        {
            ECHO "notice: [openssl] Using pre-installed library" ;
            if $(condition)
            {
                ECHO "notice: [openssl] Condition" [ $(condition).raw ] ;
            }
        }

        ssl-name ?= $(ssl_names) ;
        crypto-name ?= $(crypto_names) ;

        local ssl_lib = [ new ac-library ssl : $(.project) : $(condition) :
            $(include-path) : $(library-path) ] ;
        $(ssl_lib).set-header openssl/ssl.h ;
        $(ssl_lib).set-default-names $(ssl-name) ;
        $(ssl_lib).add-usage-requirements $(dll-paths) ;

        local crypto_lib = [ new ac-library crypto : $(.project) : $(condition) :
            $(include-path) : $(library-path) ] ;
        $(crypto_lib).set-header openssl/crypto.h ;
        $(crypto_lib).set-default-names $(crypto-name) ;
        $(crypto_lib).add-usage-requirements $(dll-paths) ;

        targets.main-target-alternative $(ssl_lib) ;
        targets.main-target-alternative $(crypto_lib) ;
    }
    .configured.$(condition) = true ;
}

