#!/usr/bin/env bash
set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
cd "$SCRIPT_DIR"

# Colors
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[0;33m'
NC='\033[0m'

log()  { echo -e "${GREEN}[bx-backend]${NC} $*"; }
warn() { echo -e "${YELLOW}[bx-backend]${NC} $*"; }
err()  { echo -e "${RED}[bx-backend]${NC} $*" >&2; }

# ---- Virtual Env ----
if [ -d ".venv" ]; then
    log "Activating .venv"
    source .venv/bin/activate
elif [ -d "venv" ]; then
    log "Activating venv"
    source venv/bin/activate
else
    warn "No virtual environment found, using system Python"
fi

# Resolve python command (prefer python, fallback to python3)
PYTHON_BIN="$(command -v python 2>/dev/null || true)"
if [ -z "$PYTHON_BIN" ]; then
    PYTHON_BIN="$(command -v python3 2>/dev/null || true)"
fi
if [ -z "$PYTHON_BIN" ]; then
    err "Neither 'python' nor 'python3' command found. Install Python 3.11+ or activate a venv."
    exit 1
fi

PYTHON_MAJOR="$("$PYTHON_BIN" -c 'import sys; print(sys.version_info.major)' 2>/dev/null || echo 0)"
PYTHON_MINOR="$("$PYTHON_BIN" -c 'import sys; print(sys.version_info.minor)' 2>/dev/null || echo 0)"
if [ "$PYTHON_MAJOR" -lt 3 ] || { [ "$PYTHON_MAJOR" -eq 3 ] && [ "$PYTHON_MINOR" -lt 11 ]; }; then
    err "Python 3.11+ is required, but got: $("$PYTHON_BIN" --version 2>&1)"
    err "Please make sure 'python' or 'python3' points to a compatible version."
    exit 1
fi
PYTHON="$PYTHON_BIN"
log "Using Python: $PYTHON ($($PYTHON --version 2>&1))"

# ---- Load .env ----
if [ -f ".env" ]; then
    log "Loading .env"
    set -a
    while IFS='=' read -r key value; do
        [[ -z "$key" || "$key" =~ ^# ]] && continue
        value="${value%\"}"
        value="${value#\"}"
        value="${value%\'}"
        value="${value#\'}"
        export "$key=$value"
    done < .env
    set +a
fi

HOST="${APP_HOST:-0.0.0.0}"
PORT="${APP_PORT:-8011}"
DEBUG="${DEBUG:-false}"

log "Starting 报销系统后端服务 on ${HOST}:${PORT} (debug=${DEBUG})"

# ---- Start Server ----
if [ "$DEBUG" = "true" ]; then
    $PYTHON -m uvicorn app.main:app --host "$HOST" --port "$PORT" --reload
else
    $PYTHON -m uvicorn app.main:app --host "$HOST" --port "$PORT"
fi