#!/bin/bash

is_truthy() {
    case "${1,,}" in
        true|yes|1|y) return 0 ;;
        *) return 1 ;;
    esac
}

ENABLE_LOGGING_VALUE="${ENABLE_LOGGING:-true}"
LOG_PIPE_DIR=""
LOG_PIPE=""
TEE_PID=""

start_file_logging() {
    local logfile="$1"

    LOG_PIPE_DIR="$(mktemp -d)"
    LOG_PIPE="${LOG_PIPE_DIR}/shelfmark-log.pipe"
    mkfifo "$LOG_PIPE"

    tee -a "$logfile" < "$LOG_PIPE" &
    TEE_PID=$!

    exec 3>&1 4>&2
    exec > "$LOG_PIPE" 2>&1
}

stop_file_logging() {
    if [ -z "${TEE_PID:-}" ]; then
        return 0
    fi

    exec 1>&3 2>&4
    exec 3>&- 4>&-

    rm -f "$LOG_PIPE"
    rmdir "$LOG_PIPE_DIR" 2>/dev/null || true

    wait "$TEE_PID" 2>/dev/null || true
    TEE_PID=""
}

if is_truthy "$ENABLE_LOGGING_VALUE"; then
    LOG_DIR=${LOG_ROOT:-/var/log/}/shelfmark
    mkdir -p "$LOG_DIR"
    LOG_FILE="${LOG_DIR}/shelfmark_entrypoint.log"
    # Keep the previous entrypoint log instead of deleting all history on boot.
    [ -f "${LOG_FILE}.prev" ] && rm -f "${LOG_FILE}.prev"
    [ -f "$LOG_FILE" ] && mv "$LOG_FILE" "${LOG_FILE}.prev"
fi

(
    if [ "$USING_TOR" = "true" ]; then
        ./tor.sh
    fi
)

if is_truthy "$ENABLE_LOGGING_VALUE"; then
    start_file_logging "$LOG_FILE"
fi

echo "Starting entrypoint script"
if is_truthy "$ENABLE_LOGGING_VALUE"; then
    echo "Log file: $LOG_FILE"
else
    echo "File logging disabled (ENABLE_LOGGING=$ENABLE_LOGGING_VALUE)"
fi
set -e

PYTHON_BIN="/app/.venv/bin/python"
if [ ! -x "$PYTHON_BIN" ]; then
    PYTHON_BIN="python3"
fi

# Print build version
echo "Build version: $BUILD_VERSION"
echo "Release version: $RELEASE_VERSION"

# Configure timezone
if [ "$TZ" ]; then
    echo "Setting timezone to $TZ"
    ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
fi

# Determine user ID with proper precedence:
# 1. PUID (LinuxServer.io standard - recommended)
# 2. UID (legacy, for backward compatibility with existing installs)
# 3. Default to 1000
#
# Note: $UID is a bash builtin that's always set. We use `printenv` to detect
# if UID was explicitly set as an environment variable (e.g., via docker-compose).
if [ -n "$PUID" ]; then
    RUN_UID="$PUID"
    echo "Using PUID=$RUN_UID"
elif printenv UID >/dev/null 2>&1; then
    RUN_UID="$(printenv UID)"
    echo "Using UID=$RUN_UID (legacy - consider migrating to PUID)"
else
    RUN_UID=1000
    echo "Using default UID=$RUN_UID"
fi

# Determine group ID with proper precedence:
# 1. PGID (LinuxServer.io standard - recommended)
# 2. GID (legacy, for backward compatibility with existing installs)
# 3. Default to 1000
if [ -n "$PGID" ]; then
    RUN_GID="$PGID"
    echo "Using PGID=$RUN_GID"
elif [ -n "$GID" ]; then
    RUN_GID="$GID"
    echo "Using GID=$RUN_GID (legacy - consider migrating to PGID)"
else
    RUN_GID=1000
    echo "Using default GID=$RUN_GID"
fi

if ! getent group "$RUN_GID" >/dev/null; then
    echo "Adding group $RUN_GID with name appuser"
    groupadd -g "$RUN_GID" appuser
fi

# Create user if it doesn't exist
if ! id -u "$RUN_UID" >/dev/null 2>&1; then
    echo "Adding user $RUN_UID with name appuser"
    useradd -u "$RUN_UID" -g "$RUN_GID" -d /app -s /sbin/nologin appuser
fi

# Get username for the UID (whether we just created it or it existed)
USERNAME=$(getent passwd "$RUN_UID" | cut -d: -f1)
echo "Username for UID $RUN_UID is $USERNAME"

# Avoid unnecessary gosu hops when we're already running as the target user.
# Some nested LXC setups spin on root-to-root gosu invocations.
needs_user_switch() {
    local current_uid
    local current_gid

    current_uid=$(id -u)
    current_gid=$(id -g)

    [ "$current_uid" != "$RUN_UID" ] || [ "$current_gid" != "$RUN_GID" ]
}

run_as_target_user() {
    if needs_user_switch; then
        gosu "$USERNAME" "$@"
        return $?
    fi

    "$@"
}

exec_as_target_user() {
    if needs_user_switch; then
        exec gosu "$USERNAME" "$@"
    fi

    exec "$@"
}

test_write() {
    local folder=$1
    local test_file="$folder/shelfmark_TEST_WRITE"
    local FILE_CONTENT
    local result
    local result_text

    if ! mkdir -p "$folder"; then
        echo "Failed to create directory for write test: $folder"
        return 1
    fi

    if ! run_as_target_user sh -c 'echo 0123456789_TEST > "$1"' _ "$test_file"; then
        echo "Failed to write test file in $folder as $USERNAME"
        return 1
    fi

    FILE_CONTENT=$(cat "$test_file" 2>/dev/null || echo "")
    rm -f "$test_file"
    [ "$FILE_CONTENT" = "0123456789_TEST" ]
    result=$?
    if [ $result -eq 0 ]; then
        result_text="true"
    else
        result_text="false"
    fi
    echo "Test write to $folder by $USERNAME: $result_text"
    return $result
}

make_writable() {
    local folder="$1"
    local mode="${2:-tree}"
    local did_full_chown=0
    local is_writable
    set +e
    test_write "$folder"
    is_writable=$?
    set -e
    if [ $is_writable -eq 0 ]; then
        echo "Folder $folder is writable, no need to change ownership"
    else
        if [ "$mode" = "root" ]; then
            echo "Folder $folder is not writable, fixing top-level ownership and permissions"
            mkdir -p "$folder"
            chown "${RUN_UID}:${RUN_GID}" "$folder" || echo "Failed to change ownership for ${folder}, continuing..."
            chmod u+rwx "$folder" || echo "Failed to change owner permissions for ${folder}, continuing..."
        else
            echo "Folder $folder is not writable, changing ownership"
            change_ownership "$folder"
            chmod -R g+r,g+w "$folder" || echo "Failed to change group permissions for ${folder}, continuing..."
        fi
        did_full_chown=1
    fi
    # Fix any misowned subdirectories/files (e.g., from previous runs as root)
    if [ "$mode" = "tree" ] && [ "$did_full_chown" -eq 0 ] && [ -d "$folder" ]; then
        echo "Checking for misowned files/directories in $folder"
        # Stay on the same filesystem to avoid traversing mounted subpaths
        # (for example read-only bind mounts under /app in dev setups).
        find "$folder" -xdev -mindepth 1 \( ! -user "$RUN_UID" -o ! -group "$RUN_GID" \) \
            -exec chown "$RUN_UID:$RUN_GID" {} + 2>/dev/null || true
    fi
    test_write "$folder" || echo "Failed to test write to ${folder}, continuing..."
}

fix_misowned() {
    local folder="$1"
    mkdir -p "$folder"
    echo "Checking for misowned files/directories in $folder"
    # Stay on the same filesystem to avoid traversing mounted subpaths
    # (for example read-only bind mounts under /app in dev setups).
    find "$folder" -xdev \( ! -user "$RUN_UID" -o ! -group "$RUN_GID" \) \
        -exec chown "$RUN_UID:$RUN_GID" {} + 2>/dev/null || true
}

# Ensure proper ownership of application directories
change_ownership() {
  local folder="$1"
  mkdir -p "$folder"
  echo "Changing ownership of $folder to $USERNAME:$RUN_GID"
  chown -R "${RUN_UID}:${RUN_GID}" "${folder}" || echo "Failed to change ownership for ${folder}, continuing..."
}

ensure_tree_writable() {
    local folder="$1"

    make_writable "$folder"
    if [ -d "$folder" ]; then
        chmod -R u+rwX,g+rwX "$folder" || echo "Failed to relax permissions for ${folder}, continuing..."
    fi
}

ensure_symlinked_dir() {
    local link_path="$1"
    local target_path="$2"

    ensure_tree_writable "$target_path"

    if [ -L "$link_path" ]; then
        local current_target
        current_target=$(readlink "$link_path" 2>/dev/null || echo "")
        if [ "$current_target" = "$target_path" ]; then
            echo "$link_path already points to $target_path"
            return 0
        fi
        echo "Replacing symlink $link_path -> $current_target with $target_path"
        rm -f "$link_path" || echo "Failed to replace symlink ${link_path}, continuing..."
    elif [ -d "$link_path" ]; then
        echo "Moving existing scratch files from $link_path to $target_path"
        find "$link_path" -xdev -mindepth 1 -maxdepth 1 -exec mv -t "$target_path" {} + 2>/dev/null || true
        ensure_tree_writable "$target_path"

        if ! rmdir "$link_path" 2>/dev/null; then
            echo "Could not replace $link_path with symlink, leaving existing directory in place"
            ensure_tree_writable "$link_path"
            return 0
        fi
    elif [ -e "$link_path" ]; then
        echo "$link_path exists and is not a directory, leaving it in place"
        return 0
    fi

    if [ ! -e "$link_path" ]; then
        ln -s "$target_path" "$link_path" || echo "Failed to create symlink ${link_path}, continuing..."
    fi
}

fix_misowned /var/log/shelfmark
fix_misowned /tmp/shelfmark

# Keep SeleniumBase on its default /app-based paths, but redirect the scratch
# directories into /tmp so bypasser startup doesn't depend on image-layer writes.
if [ "${USING_EXTERNAL_BYPASSER}" != "true" ]; then
    ensure_symlinked_dir /app/downloaded_files /tmp/shelfmark/seleniumbase/downloaded_files
    ensure_symlinked_dir /app/archived_files /tmp/shelfmark/seleniumbase/archived_files

    # Keep SeleniumBase's bundled drivers directory writable as well for
    # compatibility with legacy UC code paths that still probe bundled assets.
    set +e
    SELENIUMBASE_DRIVERS_DIR=$("$PYTHON_BIN" -c "import pathlib, seleniumbase; print(pathlib.Path(seleniumbase.__file__).resolve().parent / 'drivers')" 2>/dev/null)
    set -e

    if [ -n "$SELENIUMBASE_DRIVERS_DIR" ] && [ -d "$SELENIUMBASE_DRIVERS_DIR" ]; then
        change_ownership "$SELENIUMBASE_DRIVERS_DIR"

        # If the legacy driver already exists, ensure it's executable for the runtime user.
        if [ -f "${SELENIUMBASE_DRIVERS_DIR}/uc_driver" ]; then
            chmod +x "${SELENIUMBASE_DRIVERS_DIR}/uc_driver" || echo "Failed to chmod uc_driver, continuing..."
        fi
    fi
fi

# Config can contain existing state we must keep accessing, so it keeps the
# thorough repair path. Output destination roots only need top-level writability.
make_writable "${CONFIG_DIR:-/config}" tree
# Entrypoint only has env vars available at this stage, so use the legacy
# INGEST_DIR env var as the fallback source for the default destination root.
make_writable "${INGEST_DIR:-/books}" root

# Check any additional configured destination roots from saved settings
echo "Checking for additional configured destination roots..."
if [ -f /app/scripts/fix_permissions.py ]; then
    configured_dirs=$("$PYTHON_BIN" /app/scripts/fix_permissions.py 2>/dev/null || echo "")
    if [ -n "$configured_dirs" ]; then
        echo "$configured_dirs" | while read -r dir; do
            if [ -n "$dir" ] && [ -d "$dir" ]; then
                echo "Checking configured destination root: $dir"
                make_writable "$dir" root
            fi
        done
    fi
fi

# Fallback to root if config dir is still not writable (common on NAS/Unraid after upgrade from v0.4.0)
CONFIG_PATH=${CONFIG_DIR:-/config}
set +e
test_write "$CONFIG_PATH" >/dev/null 2>&1
config_ok=$?
set -e

if [ $config_ok -ne 0 ] && [ "$RUN_UID" != "0" ]; then
    config_owner=$(stat -c '%u' "$CONFIG_PATH" 2>/dev/null || echo "unknown")
    if [ "$config_owner" = "0" ]; then
        echo ""
        echo "========================================================"
        echo "WARNING: Permission issue detected!"
        echo ""
        echo "Config directory is owned by root but PUID=$RUN_UID."
        echo "This typically happens after upgrading from v0.4.0 where"
        echo "PUID/PGID settings were not respected."
        echo ""
        echo "Falling back to running as root to prevent data loss."
        echo ""
        echo "To fix this permanently, run on your HOST machine:"
        echo "  chown -R $RUN_UID:$RUN_GID /path/to/config"
        echo ""
        echo "Then restart the container."
        echo "========================================================"
        echo ""
        RUN_UID=0
        RUN_GID=0
        USERNAME=root
    fi
fi

# Always run Gunicorn (even when DEBUG=true) to ensure Socket.IO WebSocket
# upgrades work reliably on customer machines.
# Map app LOG_LEVEL (often DEBUG/INFO/...) to gunicorn's --log-level (lowercase).
gunicorn_loglevel=$([ "$DEBUG" = "true" ] && echo debug || echo "${LOG_LEVEL:-info}" | tr '[:upper:]' '[:lower:]')
command="gunicorn --log-level ${gunicorn_loglevel} --access-logfile - --error-logfile - --worker-class geventwebsocket.gunicorn.workers.GeventWebSocketWorker --workers 1 -t 300 -b ${FLASK_HOST:-0.0.0.0}:${FLASK_PORT:-8084} shelfmark.main:app"

# If DEBUG and not using an external bypass
if [ "$DEBUG" = "true" ] && [ "$USING_EXTERNAL_BYPASSER" != "true" ]; then
    set +e
    set -x
    echo "vvvvvvvvvvvv DEBUG MODE vvvvvvvvvvvv"
    echo "Starting Xvfb for debugging"
    "$PYTHON_BIN" -c "from pyvirtualdisplay import Display; Display(visible=False, size=(1440,1880)).start()"
    id
    free -h
    uname -a
    ulimit -a
    df -h /tmp
    env | sort
    mount
    cat /proc/cpuinfo
    echo "==========================================="
    echo "Debugging Chrome itself"
    chromium --version
    mkdir -p /tmp/chrome_crash_dumps
    timeout --preserve-status 5s chromium \
            --headless=new \
            --no-sandbox \
            --disable-gpu \
            --enable-logging --v=1 --log-level=0 \
            --log-file=/tmp/chrome_entrypoint_test.log \
            --crash-dumps-dir=/tmp/chrome_crash_dumps \
            < /dev/null 
    EXIT_CODE=$?
    echo "Chrome exit code: $EXIT_CODE"
    ls -lh /tmp/chrome_entrypoint_test.log
    ls -lh /tmp/chrome_crash_dumps
    if [[ "$EXIT_CODE" -ne 0 && "$EXIT_CODE" -le 127 ]]; then
        echo "Chrome failed to start. Lets trace it"
        apt-get update && apt-get install -y strace
        timeout --preserve-status 10s strace -f -o "/tmp/chrome_strace.log" chromium \
                --headless=new \
                --no-sandbox \
                --version \
                < /dev/null
        EXIT_CODE=$?
        echo "Strace exit code: $EXIT_CODE"
        echo "Strace log:"
        cat /tmp/chrome_strace.log
    fi

    pkill -9 -f Xvfb
    pkill -9 -f chromium
    sleep 1
    ps aux
    set +x
    set -e
    echo "^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^"
fi

# Verify /tmp has at least 1MB of space and is writable/readable
echo "Verifying /tmp has enough space"
rm -f /tmp/test.shelfmark
if dd if=/dev/zero of=/tmp/test.shelfmark bs=1M count=1 2>/dev/null && \
   [ "$(wc -c < /tmp/test.shelfmark)" -eq 1048576 ]; then
    rm -f /tmp/test.shelfmark
    echo "Success: /tmp is writable and readable"
else
    echo "Failure: /tmp is not writable or has insufficient space"
    exit 1
fi

echo "Running command: '$command' as '$USERNAME' (debug=$is_debug)"

# Set umask for file permissions (default: 0022 = files 644, dirs 755)
UMASK_VALUE=${UMASK:-0022}
echo "Setting umask to $UMASK_VALUE"
umask $UMASK_VALUE

stop_file_logging
exec_as_target_user env HOME=/app $command