#!/bin/bash

#=================================================
# GENERIC STARTING
#=================================================
# IMPORT GENERIC HELPERS
#=================================================

source _common.sh
source /usr/share/yunohost/helpers

#=================================================
# RETRIEVE ARGUMENTS
#=================================================

app=$YNH_APP_INSTANCE_NAME

final_path=$(ynh_app_setting_get $app final_path)
#=================================================
# SPECIFIC CODE
#=================================================
# DECLARE GENERIC FUNCTION
#=================================================

lowerdot_to_uppersnake() {
    local lowerdot
    lowerdot=$(echo "$1" | cut -d= -f1 | sed "s/\./_/g")
    echo "${lowerdot^^}"
}

_ynh_panel_get() {
    
    # From settings
    local params_sources
    params_sources=`python << EOL
import toml
from collections import OrderedDict
with open("/etc/yunohost/apps/vpnclient/config_panel.toml", "r") as f:
    file_content = f.read()
loaded_toml = toml.loads(file_content, _dict=OrderedDict)

for panel_name,panel in loaded_toml.items():
    if isinstance(panel, dict):
        for section_name, section in panel.items():
            if isinstance(section, dict):
                for name, param in section.items():
                    if isinstance(param, dict) and param.get('source', '') == 'settings':
                        print("%s.%s.%s=%s" %(panel_name, section_name, name, param.get('source', 'settings')))
EOL
`
    for param_source in params_sources
    do
        local _dot_setting=$(echo "$param_source" | cut -d= -f1)
        local _snake_setting="YNH_CONFIG_$(lowerdot_to_uppersnake $dot_setting)"
        local short_setting=$(echo "$_dot_setting" | cut -d. -f3)
        local _getter="get__${short_setting}"
        local source="$(echo $param_source | cut -d= -f2)"

        # Get value from getter if exists
        if type $getter | grep -q '^function$' 2>/dev/null; then
            old[$short_setting]="$($getter)"

        # 
        elif [[ "$source" != "settings" ]]
        then
            old[$short_setting]="$source"
        
        # By default, get value from settings.yml
        else
            old[$short_setting]="$(ynh_app_setting_get $app $short_setting)"
        fi

    done
    
    
}

_ynh_panel_apply() {
    for short_setting in "${!dot_settings[@]}"
    do
        local setter="set__${short_setting}"
        local source="$sources[$short_setting]"
        
        # Apply setter if exists
        if type $setter | grep -q '^function$' 2>/dev/null; then
            $setter

        # Copy file in right place 
        elif [[ "$source" != "settings" ]]
        then
            cp "$new[$short_setting]" "$source"

        # By default, set value into settings.yml
        else
            ynh_app_setting_get $app $short_setting "$new[$short_setting]"
        fi
    done
}

_ynh_panel_show() {
    for short_setting in "${!old[@]}"
    do
        local key="YNH_CONFIG_$(lowerdot_to_uppersnake $dot_settings[$short_setting])"
	    ynh_return "$key=${old[$short_setting]}"
    done
}

_ynh_panel_validate() {
    # Change detection
    local is_error=true
    #for changed_status in "${!changed[@]}"
    for short_setting in "${!dot_settings[@]}"
    do
        #TODO file hash
                file_hash[$setting]=$(sha256sum "$_source" | cut -d' ' -f1)
                file_hash[$form_setting]=$(sha256sum "${!form_setting}" | cut -d' ' -f1)
                if [[ "${file_hash[$setting]}" != "${file_hash[$form_setting]}" ]]
                then
                    changed[$setting]=true
                fi
        if [[ "$new[$short_setting]" == "$old[$short_setting]" ]]
        then
            changed[$short_setting]=false
        else
            changed[$short_setting]=true
            is_error=false
        fi
    done
    
    # Run validation if something is changed
    if [[ "$is_error" == "false" ]]
    then

        for short_setting in "${!dot_settings[@]}"
        do
            local result="$(validate__$short_setting)"
            local key="YNH_ERROR_$(lowerdot_to_uppersnake $dot_settings[$short_setting])"
            if [ -n "$result" ]
            then
                ynh_return "$key=$result"
                is_error=true
            fi
        done
    fi

    if [[ "$is_error" == "true" ]]
    then
        ynh_die
    fi 
    
}

ynh_panel_init() {
    declare -A old=()
    declare -A changed=()
    declare -A file_hash=()
    
    ynh_panel_get
}

ynh_panel_show() {
    _ynh_panel_show
}

ynh_panel_validate() {
    _ynh_panel_validate
}

ynh_panel_apply() {
    _ynh_panel_apply
}

#=================================================
# SPECIFIC GETTERS FOR TOML SHORT KEY
#=================================================

get__status() {
    if [ -f "/sys/class/net/tun0/operstate" ] && [ "$(cat /sys/class/net/tun0/operstate)" == "up" ]
    then
        echo "running"
    else
        echo "not running"
    fi
}

get__login_user() {
    if [ -s /etc/openvpn/keys/credentials ]
    then
        sed -n 1p /etc/openvpn/keys/credentials 
    fi
}

get__login_passphrase() {
    if [ -s /etc/openvpn/keys/credentials ]
    then
        sed -n 2p /etc/openvpn/keys/credentials 
    fi
}


#=================================================
# SPECIFIC VALIDATORS FOR TOML SHORT KEYS
#=================================================
validate__login_user() {
    [[ -n "$login_passphrase" && -z "$login_user" ]] &&
        echo 'A Username is needed when you suggest a Password'
}

validate__login_passphrase() {
    [[ -n "$login_user" && -z "$login_passphrase" ]] &&
        echo 'A Password is needed when you suggest a Username'
}

validate__crt() {
    [[ -n "$key" && -z "$crt" ]] &&
        echo "A Client Certificate is needed when you suggest a Key"
}

validate__key() {
    [[ -n "$crt" && -z "$key" ]] &&
        echo "A Key is needed when you suggest a Client Certificate"
}

# TODO
validate__server_ip6() {
    $ipv6_expanded=$(ipv6_expanded "$server_ip6")
    if [[ -z "$ipv6_expanded" ]]
    then 
        echo 'The IPv6 Delegated Prefix format looks bad'
    fi

    #        $ip6_blocs = explode(':', $ip6_net);
    #    $ip6_addr = "${ip6_blocs[0]}:${ip6_blocs[1]}:${ip6_blocs[2]}:${ip6_blocs[3]}:${ip6_blocs[4]}:${ip6_blocs[5]}:${ip6_blocs[6]}:42";

    #    $ip6_net = ipv6_compressed($ip6_net);
    #    $ip6_addr = ipv6_compressed($ip6_addr);
}

#=================================================
# SPECIFIC SETTERS FOR TOML SHORT KEYS
#=================================================
set__login_user() {
    if [ -z "$login_user" ]
    then
        echo "$login_user\n$login_passphrase" > /etc/openvpn/keys/credentials 
    else
        echo "" > /etc/openvpn/keys/credentials
    fi
}

set__login_passphrase() {
    :
}

# TODO
set__cube_file() {
    if [ -f "$cube_file" ]
    then
        cp -f $tmp_dir/client.conf.tpl /etc/openvpn/client.conf.tpl
    fi
}

#=================================================
# OVERWRITING VALIDATE STEP 
#=================================================
ynh_panel_validate() {
    
    # Overwrite form response with cube files data before validation process
    if [[ "$cube_file" ]]
    then
        # TODO
        declare -A settings
        settings[server_name]=""
        settings[server_port]=""
        settings[server_proto]=""
        settings[login_user]=""
        settings[login_passphrase]=""
        settings[dns0]=""
        settings[dns1]=""
        settings[crt_server_ca]="file"
        settings[crt_client]="file"
        settings[crt_client_key]="file"
        settings[crt_client_ta]="file"

        tmp_dir=$(dirname "$cube_file")
        for setting_name in "${!settings[@]}"
        do
            setting_value="$(jq --raw-output '.$setting_name' '$cube_file')"
            if [[ "$setting_value" == "null" ]]
            then
                setting_value=''
            # Save file in tmp dir
            elif [[ "${settings[$setting_name]}" == "file" ]]
            then
                echo "${settings[$setting_name]}" | sed s/|/\n/g > $tmp_dir/$setting_name
                setting_value="$tmp_dir/$setting_name"
            fi

            # Change settings value and changed status if needed
            if [[ "$setting_value" != "${!setting}" ]]
            then
                declare "$setting='$setting_value'"
                changed[$setting]=false
                if [[ "$setting_value" != "${old[$setting]}" ]]
                then
                    changed[$setting]=true
                fi
            fi
        done
        
        # Build specific OVPN template
        cp -f /etc/openvpn/client.conf.tpl.restore $tmp_dir/client.conf.tpl
        # Remove some lines
        for rm_regex in "$(jq --raw-output '.openvpn_rm[]' '$cube_file')"
        do
            sed -i "/$rm_regex/di" $tmp_dir/client.conf.tpl
        done

        # Add some other lines
        echo "# Custom" >> $tmp_dir/client.conf.tpl
        jq --raw-output ".openvpn_add[]" "$cube_file" >> $tmp_dir/client.conf.tpl
    fi

    _ynh_panel_validate
}

#=================================================
# OVERWRITING APPLY STEP 
#=================================================
ynh_panel_apply() {
    
    # Stop vpn client
    touch /tmp/.ynh-vpnclient-stopped
    systemctl stop ynh-vpnclient

    _ynh_panel_apply

    # Start vpn client
    systemctl start ynh-vpnclient
    rm -f /tmp/.ynh-vpnclient-stopped

}

#=================================================
# GENERIC FINALIZATION
#=================================================
# Please don't change that code.
# You can overwrite these functions if you need it
#=================================================

ynh_panel_init
case $1 in
  show) ynh_panel_show;;
  apply) ynh_panel_validate && ynh_panel_apply;;
esac