#!/usr/bin/env bash

# ---- Functions
_env_usage() {
    echo "Usage: $0 --config <json-file> --pair <pair-id>"
}
get_tcp_port() {
    local start="$1"
    local end="$2"
    local port

    for ((port=start; port<=end; port++)); do
        if ! ss -ltn "sport = :$port" | grep -q ":$port"; then
            echo "$port"
            return 0
        fi
    done

    echo ""
    return 1
}

_extract_base_currency() {
    local s="$1"
    local rest
    local _prefix
    local base
    local _quote

    rest="${s#*:}"

    if [[ "$rest" == "$s" ]]; then
        echo ""
        return 1
    fi

    IFS='-' read -r _prefix base _quote <<< "$rest"

    if [[ -z "$base" ]]; then
        echo ""
        return 1
    fi

    echo "$base"
}

# Detect whether script is sourced
_env_is_sourced() {
    [[ "${BASH_SOURCE[0]}" != "$0" ]]
}

pair_to_project_name() {
    local pair="$1"
    pair="${pair,,}"      # lowercase
    pair="${pair//-/_}"   # replace - with _
    echo "$pair"
}

# ==============================
CONFIG=""
PAIR=""

while [[ $# -gt 0 ]]; do
    case "$1" in
        --config)
            CONFIG="$2"
            shift 2
            ;;
        --pair)
            PAIR="$2"
            shift 2
            ;;
        -h|--help)
            _env_usage
            _env_is_sourced && return 0 || exit 0
            ;;
        *)
            echo "Unknown argument: $1" >&2
            _env_usage >&2
            _env_is_sourced && return 1 || exit 1
            ;;
    esac
done

if [[ -z "$CONFIG" ]]; then
    echo "Missing --config" >&2
    _env_usage >&2
    _env_is_sourced && return 1 || exit 1
fi

if [[ -z "$PAIR" ]]; then
    echo "Missing --pair" >&2
    _env_usage >&2
    _env_is_sourced && return 1 || exit 1
fi

if [[ ! -f "$CONFIG" ]]; then
    echo "Config file not found: $CONFIG" >&2
    _env_is_sourced && return 1 || exit 1
fi

required_commands="jq hjson"
for cmd in ${required_commands}; do
    if ! command -v $cmd >/dev/null 2>&1; then
        echo "Error: $cmd is required but not installed" >&2
        _env_is_sourced && return 1 || exit 1
    fi
done

BOOK_VALUE="$(hjson -j "${CONFIG}" | jq -r '.book // empty' )"
INST_A_VALUE="$(hjson -j "${CONFIG}" | jq -r --arg pair "$PAIR" '.pairs[$pair].INST_A // empty' )"
INST_B_VALUE="$(hjson -j "${CONFIG}" | jq -r --arg pair "$PAIR" '.pairs[$pair].INST_B // empty' )"

if [[ -z "$BOOK_VALUE" ]]; then
    echo "Missing .book in config: $CONFIG" >&2
    _env_is_sourced && return 1 || exit 1
fi

if [[ -z "$INST_A_VALUE" || -z "$INST_B_VALUE" ]]; then
    echo "Pair not found or incomplete: $PAIR" >&2
    _env_is_sourced && return 1 || exit 1
fi

export BOOK="$BOOK_VALUE"
export INST_A="$INST_A_VALUE"
export INST_B="$INST_B_VALUE"

echo "BOOK=$BOOK"
echo "INST_A=$INST_A"
echo "INST_B=$INST_B"

export DOCKER_PAIR_NAME="$(_extract_base_currency ${INST_A})-$(_extract_base_currency ${INST_B})"
export PROJECT_NAME=$(pair_to_project_name "${DOCKER_PAIR_NAME}")

export SP_QUANT_BOOK="${BOOK}"
export SP_QUANT_INST_A="${INST_A}"
export SP_QUANT_INST_B="${INST_B}"


export CVTT_DOCKER_REGISTRY=cloud16.cvtt.vpn:5543

######################################
export SP_QUANT_VERSION=2.3.5
######################################

export SP_QUANT_APP_NAME=SPQ

export SP_QUANT_LOG_DIR=/logs
export SP_QUANT_LOG_FILE=%T.sp_quant.${DOCKER_PAIR_NAME}.log
export SP_QUANT_ADD_ARGS=

# CVTT settings
export SP_QUANT_CONFIG_SERVICE=cloud16.cvtt.vpn:6789
export SP_QUANT_CONFIG_FILE=http://cloud16.cvtt.vpn:6789/apps/stat_pairs/stat_pair_quant
export SP_QUANT_FGW_BASE_URL=http://cld32-tester.cvtt.vpn:23456

# Local settings
export SP_QUANT_REST_HOST=$(hostname).cvtt.vpn
export SP_QUANT_REST_PORT=$(get_tcp_port 52000 53000)

# -------------------