#!/bin/bash

_ynh_app_config_get_one() {
    local short_setting="$1"
    local type="$2"
    local bind="$3"
    local getter="get__${short_setting}"
    # Get value from getter if exists
    if type -t $getter 2>/dev/null | grep -q '^function$' 2>/dev/null; then
        old[$short_setting]="$($getter)"
        formats[${short_setting}]="yaml"

    elif [[ "$bind" == *"("* ]] && type -t "get__${bind%%(*}" 2>/dev/null | grep -q '^function$' 2>/dev/null; then
        old[$short_setting]="$("get__${bind%%(*}" $short_setting $type $bind)"
        formats[${short_setting}]="yaml"

    elif [[ "$bind" == "null" ]]; then
        old[$short_setting]="YNH_NULL"

    # Get value from app settings or from another file
    elif [[ "$type" == "file" ]]; then
        if [[ "$bind" == "settings" ]]; then
            ynh_die --message="File '${short_setting}' can't be stored in settings"
        fi
        old[$short_setting]="$(ls "$(echo $bind | sed s@__INSTALL_DIR__@$install_dir@ | sed s@__FINALPATH__@$final_path@ | sed s/__APP__/$app/)" 2>/dev/null || echo YNH_NULL)"
        file_hash[$short_setting]="true"

    # Get multiline text from settings or from a full file
    elif [[ "$type" == "text" ]]; then
        if [[ "$bind" == "settings" ]]; then
            old[$short_setting]="$(ynh_app_setting_get $app $short_setting)"
        elif [[ "$bind" == *":"* ]]; then
            ynh_die --message="For technical reasons, multiline text '${short_setting}' can't be stored automatically  in a variable file, you have to create custom getter/setter"
        else
            old[$short_setting]="$(cat $(echo $bind | sed s@__INSTALL_DIR__@$install_dir@ | sed s@__FINALPATH__@$final_path@ | sed s/__APP__/$app/) 2>/dev/null || echo YNH_NULL)"
        fi

    # Get value from a kind of key/value file
    else
        local bind_after=""
        if [[ "$bind" == "settings" ]]; then
            bind=":/etc/yunohost/apps/$app/settings.yml"
        fi
        local bind_key_="$(echo "$bind" | cut -d: -f1)"
        bind_key_=${bind_key_:-$short_setting}
        if [[ "$bind_key_" == *">"* ]]; then
            bind_after="$(echo "${bind_key_}" | cut -d'>' -f1)"
            bind_key_="$(echo "${bind_key_}" | cut -d'>' -f2)"
        fi
        local bind_file="$(echo "$bind" | cut -d: -f2 | sed s@__INSTALL_DIR__@$install_dir@ | sed s@__FINALPATH__@$final_path@ | sed s/__APP__/$app/)"
        old[$short_setting]="$(ynh_read_var_in_file --file="${bind_file}" --key="${bind_key_}" --after="${bind_after}")"

    fi
}
_ynh_app_config_apply_one() {
    local short_setting="$1"
    local setter="set__${short_setting}"
    local bind="${binds[$short_setting]}"
    local type="${types[$short_setting]}"
    if [ "${changed[$short_setting]}" == "true" ]; then
        # Apply setter if exists
        if type -t $setter 2>/dev/null | grep -q '^function$' 2>/dev/null; then
            $setter

        elif [[ "$bind" == *"("* ]] && type -t "set__${bind%%(*}" 2>/dev/null | grep -q '^function$' 2>/dev/null; then
            "set__${bind%%(*}" $short_setting $type $bind

        elif [[ "$bind" == "null" ]]; then
            return

        # Save in a file
        elif [[ "$type" == "file" ]]; then
            if [[ "$bind" == "settings" ]]; then
                ynh_die --message="File '${short_setting}' can't be stored in settings"
            fi
            local bind_file="$(echo "$bind" | sed s@__INSTALL_DIR__@$install_dir@ | sed s@__FINALPATH__@$final_path@ | sed s/__APP__/$app/)"
            if [[ "${!short_setting}" == "" ]]; then
                ynh_backup_if_checksum_is_different --file="$bind_file"
                ynh_secure_remove --file="$bind_file"
                ynh_delete_file_checksum --file="$bind_file"
                ynh_print_info --message="File '$bind_file' removed"
            else
                ynh_backup_if_checksum_is_different --file="$bind_file"
                if [[ "${!short_setting}" != "$bind_file" ]]; then
                    cp "${!short_setting}" "$bind_file"
                fi
                ynh_store_file_checksum --file="$bind_file" --update_only
                ynh_print_info --message="File '$bind_file' overwritten with ${!short_setting}"
            fi

        # Save value in app settings
        elif [[ "$bind" == "settings" ]]; then
            ynh_app_setting_set --app=$app --key=$short_setting --value="${!short_setting}"
            ynh_print_info --message="Configuration key '$short_setting' edited in app settings"

        # Save multiline text in a file
        elif [[ "$type" == "text" ]]; then
            if [[ "$bind" == *":"* ]]; then
                ynh_die --message="For technical reasons, multiline text '${short_setting}' can't be stored automatically  in a variable file, you have to create custom getter/setter"
            fi
            local bind_file="$(echo "$bind" | sed s@__INSTALL_DIR__@$install_dir@ | sed s@__FINALPATH__@$final_path@ | sed s/__APP__/$app/)"
            ynh_backup_if_checksum_is_different --file="$bind_file"
            echo "${!short_setting}" >"$bind_file"
            ynh_store_file_checksum --file="$bind_file" --update_only
            ynh_print_info --message="File '$bind_file' overwritten with the content provided in question '${short_setting}'"

        # Set value into a kind of key/value file
        else
            local bind_after=""
            local bind_key_="$(echo "$bind" | cut -d: -f1)"
            bind_key_=${bind_key_:-$short_setting}
            if [[ "$bind_key_" == *">"* ]]; then
                bind_after="$(echo "${bind_key_}" | cut -d'>' -f1)"
                bind_key_="$(echo "${bind_key_}" | cut -d'>' -f2)"
            fi
            local bind_file="$(echo "$bind" | cut -d: -f2 | sed s@__INSTALL_DIR__@$install_dir@ | sed s@__FINALPATH__@$final_path@ | sed s/__APP__/$app/)"

            ynh_backup_if_checksum_is_different --file="$bind_file"
            ynh_write_var_in_file --file="${bind_file}" --key="${bind_key_}" --value="${!short_setting}" --after="${bind_after}"
            ynh_store_file_checksum --file="$bind_file" --update_only

            # We stored the info in settings in order to be able to upgrade the app
            ynh_app_setting_set --app=$app --key=$short_setting --value="${!short_setting}"
            ynh_print_info --message="Configuration key '$bind_key_' edited into $bind_file"

        fi
    fi
}
_ynh_app_config_get() {
    # From settings
    local lines
    lines=$(
        python3 <<EOL
import toml
from collections import OrderedDict
with open("../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 not isinstance(panel, dict): continue
    for section_name, section in panel.items():
        if not isinstance(section, dict): continue
        for name, param in section.items():
            if not isinstance(param, dict):
                continue
            print(';'.join([
                name,
                param.get('type', 'string'),
                param.get('bind', 'settings' if param.get('type', 'string') != 'file' else 'null')
                ]))
EOL
    )
    for line in $lines; do
        # Split line into short_setting, type and bind
        IFS=';' read short_setting type bind <<<"$line"
        binds[${short_setting}]="$bind"
        types[${short_setting}]="$type"
        file_hash[${short_setting}]=""
        formats[${short_setting}]=""
        ynh_app_config_get_one $short_setting $type $bind
    done

}

_ynh_app_config_apply() {
    for short_setting in "${!old[@]}"; do
        ynh_app_config_apply_one $short_setting
    done
}

_ynh_app_config_show() {
    for short_setting in "${!old[@]}"; do
        if [[ "${old[$short_setting]}" != YNH_NULL ]]; then
            if [[ "${formats[$short_setting]}" == "yaml" ]]; then
                ynh_return "${short_setting}:"
                ynh_return "$(echo "${old[$short_setting]}" | sed 's/^/  /g')"
            else
                ynh_return "${short_setting}: "'"'"$(echo "${old[$short_setting]}" | sed 's/"/\\"/g' | sed ':a;N;$!ba;s/\n/\n\n/g')"'"'

            fi
        fi
    done
}

_ynh_app_config_validate() {
    # Change detection
    ynh_script_progression --message="Checking what changed in the new configuration..." --weight=1
    local nothing_changed=true
    local changes_validated=true
    for short_setting in "${!old[@]}"; do
        changed[$short_setting]=false
        if [ -z ${!short_setting+x} ]; then
            # Assign the var with the old value in order to allows multiple
            # args validation
            declare -g "$short_setting"="${old[$short_setting]}"
            continue
        fi
        if [ ! -z "${file_hash[${short_setting}]}" ]; then
            file_hash[old__$short_setting]=""
            file_hash[new__$short_setting]=""
            if [ -f "${old[$short_setting]}" ]; then
                file_hash[old__$short_setting]=$(sha256sum "${old[$short_setting]}" | cut -d' ' -f1)
                if [ -z "${!short_setting}" ]; then
                    changed[$short_setting]=true
                    nothing_changed=false
                fi
            fi
            if [ -f "${!short_setting}" ]; then
                file_hash[new__$short_setting]=$(sha256sum "${!short_setting}" | cut -d' ' -f1)
                if [[ "${file_hash[old__$short_setting]}" != "${file_hash[new__$short_setting]}" ]]; then
                    changed[$short_setting]=true
                    nothing_changed=false
                fi
            fi
        else
            if [[ "${!short_setting}" != "${old[$short_setting]}" ]]; then
                changed[$short_setting]=true
                nothing_changed=false
            fi
        fi
    done
    if [[ "$nothing_changed" == "true" ]]; then
        ynh_print_info --message="Nothing has changed"
        exit 0
    fi

    # Run validation if something is changed
    ynh_script_progression --message="Validating the new configuration..." --weight=1

    for short_setting in "${!old[@]}"; do
        [[ "${changed[$short_setting]}" == "false" ]] && continue
        local result=""
        if type -t validate__$short_setting | grep -q '^function$' 2>/dev/null; then
            result="$(validate__$short_setting)"
        elif [[ "$bind" == *"("* ]] && type -t "validate__${bind%%(*}" 2>/dev/null | grep -q '^function$' 2>/dev/null; then
            "validate__${bind%%(*}" $short_setting
        fi
        if [ -n "$result" ]; then
            #
            # Return a yaml such as:
            #
            # validation_errors:
            #   some_key: "An error message"
            #   some_other_key: "Another error message"
            #
            # We use changes_validated to know if this is
            # the first validation error
            if [[ "$changes_validated" == true ]]; then
                ynh_return "validation_errors:"
            fi
            ynh_return "  ${short_setting}: \"$result\""
            changes_validated=false
        fi
    done

    # If validation failed, exit the script right now (instead of going into apply)
    # Yunohost core will pick up the errors returned via ynh_return previously
    if [[ "$changes_validated" == "false" ]]; then
        exit 0
    fi

}

ynh_app_config_get_one() {
    _ynh_app_config_get_one $1 $2 $3
}

ynh_app_config_get() {
    _ynh_app_config_get
}

ynh_app_config_show() {
    _ynh_app_config_show
}

ynh_app_config_validate() {
    _ynh_app_config_validate
}

ynh_app_config_apply_one() {
    _ynh_app_config_apply_one $1
}
ynh_app_config_apply() {
    _ynh_app_config_apply
}

ynh_app_action_run() {
    local runner="run__$1"
    # Get value from getter if exists
    if type -t "$runner" 2>/dev/null | grep -q '^function$' 2>/dev/null; then
        $runner
        #ynh_return "result:"
        #ynh_return "$(echo "${result}" | sed 's/^/  /g')"
    else
        ynh_die "No handler defined in app's script for action $1. If you are the maintainer of this app, you should define '$runner'"
    fi
}

ynh_app_config_run() {
    declare -Ag old=()
    declare -Ag changed=()
    declare -Ag file_hash=()
    declare -Ag binds=()
    declare -Ag types=()
    declare -Ag formats=()

    case $1 in
    show)
        ynh_app_config_get
        ynh_app_config_show
        ;;
    apply)
        max_progression=4
        ynh_script_progression --message="Reading config panel description and current configuration..."
        ynh_app_config_get

        ynh_app_config_validate

        ynh_script_progression --message="Applying the new configuration..."
        ynh_app_config_apply
        ynh_script_progression --message="Configuration of $app completed" --last
        ;;
    *)
        ynh_app_action_run $1
    esac
}