#!/bin/bash
# ============================================================
# run_remaining_final.sh — 恢复中断的 OpenFOAM 数据生成
#
# 功能：
#   1. 扫描 output/data/*,t*/ 找出未完成的 case
#      （log.interFoam 不存在或不包含 "End"）
#   2. 清理旧 log，重新运行 blockMesh + interFoam
#   3. 8 路 xargs 并行
#   4. 结果写入 batch_log.txt
#
# 用法：
#   bash run_remaining_final.sh [N_JOBS]
#   默认 N_JOBS=8
# ============================================================

# ---- OpenFOAM 环境初始化 ----
# WSL 重启后环境变量丢失，需要显式设置
# Ubuntu apt 包安装路径: 二进制 /usr/bin, 配置 /usr/share/openfoam/etc
export FOAM_APPBIN=/usr/bin
export FOAM_LIBBIN=/usr/lib/openfoam
export FOAM_ETC=/usr/share/openfoam/etc
export FOAM_APP=/usr/share/openfoam/applications
export FOAM_SRC=/usr/share/openfoam/src
export FOAM_SOLVERS=/usr/share/openfoam/applications/solvers
export FOAM_UTILITIES=/usr/share/openfoam/applications/utilities
export WM_PROJECT_DIR=/usr/share/openfoam
export FOAM_USER_LIBBIN="${HOME}/OpenFOAM/${USER}-v1906/platforms/linux64GccDPInt32Opt/lib"
export FOAM_USER_APPBIN="${HOME}/OpenFOAM/${USER}-v1906/platforms/linux64GccDPInt32Opt/bin"

if ! command -v blockMesh &>/dev/null || ! command -v interFoam &>/dev/null; then
    echo "[ERROR] 找不到 blockMesh/interFoam，请确认 OpenFOAM 已安装"
    exit 1
fi
echo "[INFO] OpenFOAM 环境就绪: FOAM_ETC=${FOAM_ETC}"

BASE_DIR="/home/alanz/openfoam-workspace/output/data"
SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
BATCH_LOG="${SCRIPT_DIR}/batch_log.txt"
CASE_LIST="${SCRIPT_DIR}/.pending_cases.txt"
N_JOBS="${1:-8}"

# 导出给 xargs 子进程使用
export BATCH_LOG

echo "========================================" | tee "$BATCH_LOG"
echo " OpenFOAM 批量恢复 — $(date '+%Y-%m-%d %H:%M:%S')" | tee -a "$BATCH_LOG"
echo "========================================" | tee -a "$BATCH_LOG"

# ---- 第一步：扫描未完成的 case ----
echo "[SCAN] 正在扫描 ${BASE_DIR} ..." | tee -a "$BATCH_LOG"
> "$CASE_LIST"

total=0
done_count=0
todo_count=0

for cat_dir in "${BASE_DIR}"/*/; do
    [ -d "$cat_dir" ] || continue
    cat_name=$(basename "$cat_dir")

    for case_dir in "${cat_dir}"t*/; do
        [ -d "$case_dir" ] || continue
        case_name=$(basename "$case_dir")
        total=$((total + 1))

        log_file="${case_dir}log.interFoam"
        if [ -f "$log_file" ] && tail -3 "$log_file" | grep -q "End"; then
            done_count=$((done_count + 1))
        else
            echo "${case_dir}" >> "$CASE_LIST"
            todo_count=$((todo_count + 1))
        fi
    done
done

echo "[SCAN] 总计: ${total} | 已完成: ${done_count} | 待运行: ${todo_count}" | tee -a "$BATCH_LOG"
echo "[SCAN] 并行数: ${N_JOBS}" | tee -a "$BATCH_LOG"

if [ "$todo_count" -eq 0 ]; then
    echo "[OK] 所有 case 均已完成，无需操作。" | tee -a "$BATCH_LOG"
    exit 0
fi

echo "" | tee -a "$BATCH_LOG"
echo "[RUN] 开始运行..." | tee -a "$BATCH_LOG"

# ---- 第二步：定义单个 case 的运行函数 ----
run_case() {
    local case_dir="$1"
    local case_name
    case_name=$(basename "$case_dir")
    local cat_name
    cat_name=$(basename "$(dirname "$case_dir")")
    local label="${cat_name}/${case_name}"
    local ts
    ts=$(date '+%H:%M:%S')

    # 清理旧 log
    rm -f "${case_dir}log.blockMesh" "${case_dir}log.interFoam"

    # blockMesh
    if ! (cd "$case_dir" && blockMesh > log.blockMesh 2>&1); then
        echo "[FAIL] ${label} — blockMesh 失败 (${ts})" | tee -a "$BATCH_LOG"
        return 0  # 不中断 xargs，继续处理下一个
    fi

    # interFoam
    if ! (cd "$case_dir" && interFoam > log.interFoam 2>&1); then
        echo "[FAIL] ${label} — interFoam 失败 (${ts})" | tee -a "$BATCH_LOG"
        return 0
    fi

    # 验证完成标记
    if tail -3 "${case_dir}log.interFoam" | grep -q "End"; then
        echo "[DONE] ${label} (${ts})" | tee -a "$BATCH_LOG"
    else
        echo "[FAIL] ${label} — 未检测到 End 标记 (${ts})" | tee -a "$BATCH_LOG"
    fi
    return 0
}
export -f run_case

# ---- 第三步：xargs 并行执行 ----
cat "$CASE_LIST" | xargs -P "$N_JOBS" -I {} bash -c 'run_case "$@"' _ {}

# ---- 第四步：最终统计 ----
echo "" | tee -a "$BATCH_LOG"
echo "========================================" | tee -a "$BATCH_LOG"
echo " 最终统计 — $(date '+%Y-%m-%d %H:%M:%S')" | tee -a "$BATCH_LOG"
echo "========================================" | tee -a "$BATCH_LOG"

final_done=0
final_fail=0

while IFS= read -r case_dir; do
    [ -d "$case_dir" ] || continue
    if [ -f "${case_dir}log.interFoam" ] && tail -3 "${case_dir}log.interFoam" | grep -q "End"; then
        final_done=$((final_done + 1))
    else
        final_fail=$((final_fail + 1))
        cat_name=$(basename "$(dirname "$case_dir")")
        case_name=$(basename "$case_dir")
        echo "[STILL-FAIL] ${cat_name}/${case_name}" | tee -a "$BATCH_LOG"
    fi
done < "$CASE_LIST"

echo "本轮完成: ${final_done} | 仍失败: ${final_fail}" | tee -a "$BATCH_LOG"
echo "全部完成: $((done_count + final_done)) / ${total}" | tee -a "$BATCH_LOG"
echo "========================================" | tee -a "$BATCH_LOG"

# 清理临时文件
rm -f "$CASE_LIST"