#!/bin/bash

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

# Get a value from heterogeneous file (yaml, json, php, python...)
#
# usage: ynh_value_get --file=PATH --key=KEY
# | arg: -f, --file=     - the path to the file
# | arg: -k, --key=     - the key to get
#
# This helpers match several var affectation use case in several languages
# We don't use jq or equivalent to keep comments and blank space in files
# This helpers work line by line, it is not able to work correctly 
# if you have several identical keys in your files
# 
# Example of line this helpers can managed correctly
# .yml
#     title: YunoHost documentation
#     email: 'yunohost@yunohost.org'
# .json
#     "theme": "colib'ris",
#     "port": 8102
#     "some_boolean":     false,
#     "user": null
# .ini
#     some_boolean = On
#     action = "Clear"
#     port = 20
# .php
#     $user=
#     user => 20
# .py
#     USER = 8102
#     user = 'https://donate.local'
#     CUSTOM['user'] = 'YunoHost'
# Requires YunoHost version 4.3 or higher.
ynh_value_get() {
    # Declare an array to define the options of this helper.
    local legacy_args=fk
    local -A args_array=( [f]=file= [k]=key= )
    local file
    local key
    # Manage arguments with getopts
    ynh_handle_getopts_args "$@"

    local var_part="[ \t]*(\$?\w*\[)?[ \t]*[\"']?${key}[\"']?[ \t]*\]?[ \t]*[:=]>?[ \t]*"
    
    local crazy_value="$(grep -i -o -P "^${var_part}\K.*(?=[ \t,\n;]*\$)" ${file} | head -n1)"
    
    local first_char="${crazy_value:0:1}"
    if [[ "$first_char" == '"' ]] ; then
        echo "$crazy_value" | grep -m1 -o -P '"\K([^"](\\")?)*[^\\](?=")' | head -n1  | sed 's/\\"/"/g'
    elif [[ "$first_char" == "'" ]] ; then
        echo "$crazy_value" | grep -m1 -o -P "'\K([^'](\\\\')?)*[^\\\\](?=')" | head -n1  | sed "s/\\\\'/'/g"
    else
        echo "$crazy_value"
    fi
}

# Set a value into heterogeneous file (yaml, json, php, python...)
#
# usage: ynh_value_set --file=PATH --key=KEY --value=VALUE
# | arg: -f, --file=     - the path to the file
# | arg: -k, --key=     - the key to set
# | arg: -v, --value=     - the value to set
#
# Requires YunoHost version 4.3 or higher.
ynh_value_set() {
    # Declare an array to define the options of this helper.
    local legacy_args=fkv
    local -A args_array=( [f]=file= [k]=key= [v]=value=)
    local file
    local key
    local value
    # Manage arguments with getopts
    ynh_handle_getopts_args "$@"

    local var_part="[ \t]*(\$?\w*\[)?[ \t]*[\"']?${key}[\"']?[ \t]*\]?[ \t]*[:=]>?[ \t]*"
    
    local crazy_value="$(grep -i -o -P "^${var_part}\K.*(?=[ \t,\n;]*\$)" ${file} | head -n1)"
    local var_part="^[ \t]*(\$?\w*\[)?[ \t]*[\"']?${key}[\"']?[ \t]*\]?[ \t]*[:=]>?[ \t]*"
    local first_char="${crazy_value:0:1}"
    if [[ "$first_char" == '"' ]] ; then
        value="$(echo "$value" | sed 's/"/\\"/g')"
        sed -ri "s%^(${var_part}\")[^\"]*(\"[ \t\n,;]*)\$%\1${value}\2%i" ${file}
    elif [[ "$first_char" == "'" ]] ; then
        value="$(echo "$value" | sed "s/'/\\\\'/g")"
        sed -ri "s%^(${var_part}')[^']*('[ \t\n,;]*)\$%\1${value}\2%i" ${file}
    else
        if [[ "$value" == *"'"* ]] || [[ "$value" == *'"'* ]] ; then
            value="\"$(echo "$value" | sed 's/"/\\"/g')\""
        fi
        sed -ri "s%^(${var_part}')[^']*('[ \t\n,;]*)\$%\1${value}\2%i" ${file}
    fi
}

_ynh_panel_get() {
    
    # From settings
    local params_sources
    params_sources=`python3 << 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_$(ynh_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)"
        
        # Get value from app settings
        elif [[ "$source" == "settings" ]] ; then
            old[$short_setting]="$(ynh_app_setting_get $app $short_setting)"
        
        # Get value from a kind of key/value file
        elif [[ "$source" == *":"* ]] ; then
            local source_key="$(echo "$source" | cut -d: -f1)"
            source_key=${source_key:-$short_setting}
            local source_file="$(echo "$source" | cut -d: -f2)"
            old[$short_setting]="$(ynh_value_get --file="${source_file}" --key="${source_key}")"
        
        # Specific case for files (all content of the file is the source)
        else
            old[$short_setting]="$source"
        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
            ynh_app_setting_set $app $short_setting "$new[$short_setting]"
        
        # Get value from a kind of key/value file
        elif [[ "$source" == *":"* ]]
        then
            local source_key="$(echo "$source" | cut -d: -f1)"
            source_key=${source_key:-$short_setting}
            local source_file="$(echo "$source" | cut -d: -f2)"
            ynh_value_set --file="${source_file}" --key="${source_key}" --value="$new[$short_setting]"

        # Specific case for files (all content of the file is the source)
        else
            cp "$new[$short_setting]" "$source"
        fi
    done
}

_ynh_panel_show() {
    for short_setting in "${!old[@]}"
    do
        local key="YNH_CONFIG_$(ynh_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__$short_setting)"
            local key="YNH_ERROR_$(ynh_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_get() {
    _ynh_panel_get
}

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
}