#!/usr/bin/env bash

set -euo pipefail

ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
ENV_FILE="${ENV_FILE:-$ROOT_DIR/.env}"
GUILD_NAME=""
ASSUME_YES=0

if [[ -f "$ENV_FILE" ]]; then
    set -a
    # shellcheck disable=SC1090
    source "$ENV_FILE"
    set +a
fi

usage() {
    cat <<EOF
Usage: $(basename "$0") <guild name> [--yes]

Permanently deletes a guild and its related character-database records.
The worldserver must be stopped before running this script.

Options:
  --yes       Skip the interactive confirmation
  -h, --help  Show this help

Examples:
  docker compose stop ac-worldserver
  ./delete-guild.sh "Название гильдии"
  ./delete-guild.sh "Название гильдии" --yes
  docker compose start ac-worldserver
EOF
}

log() {
    printf '[delete-guild] %s\n' "$*"
}

while (($#)); do
    case "$1" in
        --yes)
            ASSUME_YES=1
            shift
            ;;
        -h|--help)
            usage
            exit 0
            ;;
        -*)
            printf 'Unknown option: %s\n\n' "$1" >&2
            usage >&2
            exit 1
            ;;
        *)
            if [[ -n "$GUILD_NAME" ]]; then
                printf 'Only one guild name may be specified\n\n' >&2
                usage >&2
                exit 1
            fi
            GUILD_NAME="$1"
            shift
            ;;
    esac
done

if [[ -z "$GUILD_NAME" ]]; then
    usage >&2
    exit 1
fi

if [[ "$GUILD_NAME" == *$'\n'* || "$GUILD_NAME" == *$'\r'* || "$GUILD_NAME" == *$'\t'* ]]; then
    printf 'Guild name must not contain control characters\n' >&2
    exit 1
fi

cd "$ROOT_DIR"

RUNNING_SERVICES="$(docker compose ps --status running --services)"

if grep -qx 'ac-worldserver' <<<"$RUNNING_SERVICES"; then
    printf 'ac-worldserver is running. Stop it first:\n  docker compose stop ac-worldserver\n' >&2
    exit 1
fi

if ! grep -qx 'ac-database' <<<"$RUNNING_SERVICES"; then
    printf 'ac-database is not running. Start it first:\n  docker compose up -d ac-database\n' >&2
    exit 1
fi

export ACORE_DELETE_GUILD_NAME="$GUILD_NAME"
SQL_GUILD_NAME="$(python3 <<'PY'
import os

value = os.environ["ACORE_DELETE_GUILD_NAME"]
print("'" + value.replace("\\", "\\\\").replace("'", "\\'") + "'")
PY
)"

GUILD_ROW="$(
    docker compose exec -T ac-database bash -lc \
        'mysql -uroot -p"$MYSQL_ROOT_PASSWORD" --batch --skip-column-names acore_characters' \
        <<<"SELECT guildid, name, leaderguid FROM guild WHERE name = ${SQL_GUILD_NAME} LIMIT 1;"
)"

if [[ -z "$GUILD_ROW" ]]; then
    printf 'Guild not found: %s\n' "$GUILD_NAME" >&2
    exit 1
fi

IFS=$'\t' read -r GUILD_ID FOUND_NAME LEADER_GUID <<<"$GUILD_ROW"
log "found guild id=${GUILD_ID}, name=${FOUND_NAME}, leader=${LEADER_GUID}"

if ((ASSUME_YES == 0)); then
    printf 'This permanently deletes the guild and all items in its bank.\n'
    printf 'Type the guild name to confirm: '
    read -r CONFIRMATION
    if [[ "$CONFIRMATION" != "$FOUND_NAME" ]]; then
        printf 'Confirmation did not match; nothing was deleted.\n' >&2
        exit 1
    fi
fi

SQL=$(cat <<EOF
START TRANSACTION;

SET @guild_id := ${GUILD_ID};

CREATE TEMPORARY TABLE delete_guild_members (
    guid INT UNSIGNED NOT NULL PRIMARY KEY
) ENGINE=MEMORY
SELECT guid FROM guild_member WHERE guildid = @guild_id;

CREATE TEMPORARY TABLE delete_guild_bank_items (
    item_guid INT UNSIGNED NOT NULL PRIMARY KEY
) ENGINE=MEMORY
SELECT item_guid FROM guild_bank_item WHERE guildid = @guild_id;

DELETE item_instance
FROM item_instance
INNER JOIN delete_guild_bank_items
    ON delete_guild_bank_items.item_guid = item_instance.guid;

DELETE guild_member_withdraw
FROM guild_member_withdraw
INNER JOIN delete_guild_members
    ON delete_guild_members.guid = guild_member_withdraw.guid;

DELETE FROM guild_bank_eventlog WHERE guildid = @guild_id;
DELETE FROM guild_eventlog WHERE guildid = @guild_id;
DELETE FROM guild_bank_right WHERE guildid = @guild_id;
DELETE FROM guild_bank_item WHERE guildid = @guild_id;
DELETE FROM guild_bank_tab WHERE guildid = @guild_id;
DELETE FROM guild_rank WHERE guildid = @guild_id;
DELETE FROM guild_member WHERE guildid = @guild_id;
DELETE FROM guild WHERE guildid = @guild_id;

SET @deleted := ROW_COUNT();
COMMIT;

SELECT @guild_id AS guildid, @deleted AS deleted;
EOF
)

log "deleting guild ${FOUND_NAME} (${GUILD_ID})"
docker compose exec -T ac-database bash -lc \
    'mysql -uroot -p"$MYSQL_ROOT_PASSWORD" --show-warnings acore_characters' <<<"$SQL"

log "guild deleted"