#!/usr/bin/env bash
# ==========================================================
# ProxMenux - Global Share Functions (reusable)
# File: scripts/global/share_common.func
# ==========================================================
# All console-visible strings MUST be wrapped with $(translate "...").
# Comments and code are in English, as requested.
# Requires: utils.sh (show_proxmenux_logo, msg_info, msg_ok, msg_warn, msg_error, msg_title, etc.)
# ==========================================================

# Guard against multiple sourcing
if [[ -n "${__PROXMENUX_SHARE_COMMON__}" ]]; then
    return 0
fi
__PROXMENUX_SHARE_COMMON__=1

# Default group name used for shared folders (can be overridden by caller)
: "${PROXMENUX_DEFAULT_SHARE_GROUP:=sharedfiles}"

# Where to store simple mappings (dir -> group) to remember choices (optional)
: "${PROXMENUX_SHARE_MAP_DB:=/usr/local/share/proxmenux/share-map.db}"

# Ensure the mapping DB exists (best-effort)
mkdir -p "$(dirname "$PROXMENUX_SHARE_MAP_DB")" 2>/dev/null || true
touch "$PROXMENUX_SHARE_MAP_DB" 2>/dev/null || true

# Read mapping: returns group name for a given path
pmx_share_map_get() {
    # comments in English
    # Usage: pmx_share_map_get "/mnt/myshare"
    local key="$1"
    awk -F'=' -v k="$key" '$1==k {print $2}' "$PROXMENUX_SHARE_MAP_DB" 2>/dev/null | tail -n1
}

# Write mapping: persist association between directory and group
pmx_share_map_set() {
    # comments in English
    # Usage: pmx_share_map_set "/mnt/myshare" "sharedfiles"
    local key="$1" val="$2"
    # Remove any existing line for this key
    sed -i "\|^${key}=|d" "$PROXMENUX_SHARE_MAP_DB" 2>/dev/null || true
    echo "${key}=${val}" >> "$PROXMENUX_SHARE_MAP_DB"
}

# Ask user to reuse an existing group or create a new one
pmx_choose_or_create_group() {
    # comments in English
    # OUT: echoes chosen group name
    local default_group="${1:-$PROXMENUX_DEFAULT_SHARE_GROUP}"
    local choice group_name
    choice=$(whiptail --title "$(translate "Shared Group")" --menu "$(translate "Choose a group policy for this shared directory:")" 16 78 3 \
        "reuse"  "$(translate "Use existing group (recommended)")" \
        "new"    "$(translate "Create a new group for isolation")" \
        "custom" "$(translate "Enter a custom existing group name")" 3>&1 1>&2 2>&3) || { echo ""; return 1; }

    case "$choice" in
        reuse)
            # Ensure default group exists or create it
            pmx_ensure_host_group "$default_group" >/dev/null || return 1
            echo "$default_group"
            ;;
        new)
            group_name=$(whiptail --inputbox "$(translate "Enter new group name:")" 10 70 "sharedfiles-project" --title "$(translate "New Group")" 3>&1 1>&2 2>&3) || { echo ""; return 1; }
            [[ -z "$group_name" ]] && { msg_error "$(translate "Group name cannot be empty.")"; echo ""; return 1; }
            pmx_ensure_host_group "$group_name" >/dev/null || return 1
            echo "$group_name"
            ;;
        custom)
            group_name=$(whiptail --inputbox "$(translate "Enter existing group name:")" 10 70 "$default_group" --title "$(translate "Group Name")" 3>&1 1>&2 2>&3) || { echo ""; return 1; }
            [[ -z "$group_name" ]] && { msg_error "$(translate "Group name cannot be empty.")"; echo ""; return 1; }
            pmx_ensure_host_group "$group_name" >/dev/null || return 1
            echo "$group_name"
            ;;
        *) echo ""; return 1;;
    esac
}

# Ensure group exists on host and return its GID
pmx_ensure_host_group() {

    local group_name="$1"
    local suggested_gid="$2"

    if ! getent group "$group_name" >/dev/null 2>&1; then
        if [[ -n "$suggested_gid" ]]; then

            if getent group "$suggested_gid" >/dev/null 2>&1; then
                msg_error "$(translate "GID already in use:") $suggested_gid"
                return 1
            fi
            groupadd -g "$suggested_gid" "$group_name" >/dev/null 2>&1
        else
            groupadd "$group_name" >/dev/null 2>&1
        fi

        if [[ $? -eq 0 ]]; then
            msg_ok "$(translate "Group created:") $group_name"
        else
            msg_error "$(translate "Failed to create group:") $group_name"
            return 1
        fi
    fi

    local gid
    gid="$(getent group "$group_name" | cut -d: -f3)"
    if [[ -z "$gid" ]]; then
        msg_error "$(translate "Failed to resolve group GID for") $group_name"
        return 1
    fi

    echo "$gid"
    return 0
}

# Prepare directory on host with shared permissions (root:group, 2775, default ACLs)
pmx_prepare_host_shared_dir() {
    # comments in English
    # IN: dir path, group name
    local dir="$1" group_name="$2"
    [[ -z "$dir" || -z "$group_name" ]] && { msg_error "$(translate "Internal error: missing arguments in pmx_prepare_host_shared_dir")"; return 1; }

    if [[ ! -d "$dir" ]]; then
        if mkdir -p "$dir" 2>/dev/null; then
            msg_ok "$(translate "Created directory on host:") $dir"
        else
            msg_error "$(translate "Failed to create directory on host:") $dir"
            return 1
        fi
    fi

    chown -R root:"$group_name" "$dir" 2>/dev/null || true
    chmod -R 2775 "$dir" 2>/dev/null || true

    if command -v setfacl >/dev/null 2>&1; then
        setfacl -R -m d:g:"$group_name":rwx -m d:o::rx -m g:"$group_name":rwx "$dir" 2>/dev/null || true
        msg_ok "$(translate "Default ACLs applied for group inheritance.")"
    else
        msg_warn "$(translate "setfacl not found; default ACLs were not applied.")"
    fi
    return 0
}

# Common selector for host mountpoint base (used by SMB/NFS/Local)
pmx_select_host_mount_point() {
    # comments in English
    # OUT: echoes selected mount point path
    local title="${1:-$(translate "Select Mount Point")}"
    local default_path="${2:-/mnt/shared}"
    local choice folder_name result

    while true; do
        choice=$(whiptail --title "$title" --menu "$(translate "Where do you want the host folder?")" 16 76 4 \
            "mnt"   "$(translate "Create folder in /mnt")" \
            "srv"   "$(translate "Create folder in /srv")" \
            "media" "$(translate "Create folder in /media")" \
            "custom" "$(translate "Enter custom path")" 3>&1 1>&2 2>&3) || { echo ""; return 1; }

        case "$choice" in
            mnt)
                folder_name=$(whiptail --inputbox "$(translate "Enter folder name for /mnt:")" 10 70 "shared" --title "$(translate "Folder Name")" 3>&1 1>&2 2>&3) || { echo ""; return 1; }
                [[ -z "$folder_name" ]] && continue
                echo "/mnt/$folder_name"; return 0;;
            srv)
                folder_name=$(whiptail --inputbox "$(translate "Enter folder name for /srv:")" 10 70 "shared" --title "$(translate "Folder Name")" 3>&1 1>&2 2>&3) || { echo ""; return 1; }
                [[ -z "$folder_name" ]] && continue
                echo "/srv/$folder_name"; return 0;;
            media)
                folder_name=$(whiptail --inputbox "$(translate "Enter folder name for /media:")" 10 70 "shared" --title "$(translate "Folder Name")" 3>&1 1>&2 2>&3) || { echo ""; return 1; }
                [[ -z "$folder_name" ]] && continue
                echo "/media/$folder_name"; return 0;;
            custom)
                result=$(whiptail --inputbox "$(translate "Enter full path:")" 10 80 "$default_path" --title "$(translate "Custom Path")" 3>&1 1>&2 2>&3) || { echo ""; return 1; }
                [[ -z "$result" ]] && continue
                echo "$result"; return 0;;
        esac
    done
}

# Compute next free mp index for a CT config (mp0..mpN)
pmx_compute_next_mp_index() {
    # comments in English
    # IN: CTID
    local ctid="$1" conf="/etc/pve/lxc/${ctid}.conf"
    [[ ! -f "$conf" ]] && { echo "0"; return 0; }
    local used idx next=0
    used=$(awk -F: '/^mp[0-9]+:/ {print $1}' "$conf" | sed 's/mp//' | sort -n)
    for idx in $used; do
        [[ "$idx" -ge "$next" ]] && next=$((idx+1))
    done
    echo "$next"
}

# Add bind mount host->CT (handles privileged/unprivileged, running state)
pmx_add_bind_mount_to_ct() {
    # comments in English
    # IN: CTID, host_path, ct_path
    local ctid="$1" host_path="$2" ct_path="$3"
    local conf="/etc/pve/lxc/${ctid}.conf"
    [[ -z "$ctid" || -z "$host_path" || -z "$ct_path" ]] && { msg_error "$(translate "Internal error: missing arguments in pmx_add_bind_mount_to_ct")"; return 1; }
    [[ ! -f "$conf" ]] && { msg_error "$(translate "Container config not found:") $conf"; return 1; }

    # Avoid duplicates
    if grep -qE "^mp[0-9]+:\s*${host_path}," "$conf"; then
        msg_warn "$(translate "This host path is already present in CT config.")"
        return 0
    fi

    local unpriv running mpidx mpkey
    unpriv=$(awk '/^unprivileged:/ {print $2}' "$conf")
    running=$(pct status "$ctid" 2>/dev/null | grep -qi running && echo "yes" || echo "no")
    mpidx="$(pmx_compute_next_mp_index "$ctid")"
    mpkey="mp${mpidx}"

    if [[ "$unpriv" == "1" ]]; then
        # Unprivileged: append to config; requires restart to take effect
        echo "${mpkey}: ${host_path},mp=${ct_path}" >> "$conf"
        msg_ok "$(translate "Bind mount appended to config (unprivileged).")"
        if [[ "$running" == "yes" ]]; then
            msg_warn "$(translate "Restart the container to apply the mount.")"
        fi
    else
        # Privileged: try hot-apply via pct set; fallback to config
        if [[ "$running" == "yes" ]]; then
            if pct set "$ctid" -mp${mpidx} "${host_path},mp=${ct_path},create=dir" >/dev/null 2>&1; then
                msg_ok "$(translate "Bind mount applied live to running container (privileged).")"
            else
                echo "${mpkey}: ${host_path},mp=${ct_path},create=dir" >> "$conf"
                msg_warn "$(translate "pct set failed; entry appended to config.")"
            fi
        else
            echo "${mpkey}: ${host_path},mp=${ct_path},create=dir" >> "$conf"
            msg_ok "$(translate "Bind mount appended to config (privileged).")"
        fi
    fi
    return 0
}

# Ensure same shared group (name + GID) inside CT and add CT users to it
pmx_sync_group_in_ct() {
    # comments in English
    # IN: CTID, group_name, host_gid, [ct_user1 ct_user2 ...]
    local ctid="$1" group_name="$2" host_gid="$3"; shift 3
    local users=("$@")

    pct exec "$ctid" -- sh -lc "
        getent group ${group_name} >/dev/null || \
        (addgroup --gid ${host_gid} ${group_name} 2>/dev/null || groupadd -g ${host_gid} ${group_name} 2>/dev/null)
    " >/dev/null 2>&1

    local u
    for u in "${users[@]}"; do
        pct exec "$ctid" -- sh -lc "id -u \"$u\" >/dev/null 2>&1 && usermod -aG ${group_name} \"$u\" 2>/dev/null || true" >/dev/null 2>&1
    done
    msg_ok "$(translate "Group synchronized inside CT and users added (if present).")"
}

# Ensure target path exists inside CT with group+2775
pmx_prepare_ct_target_path() {
    # comments in English
    # IN: CTID, ct_path, group_name
    local ctid="$1" ct_path="$2" group_name="$3"
    pct exec "$ctid" -- sh -lc "mkdir -p \"$ct_path\" && chgrp \"$group_name\" \"$ct_path\" && chmod 2775 \"$ct_path\"" >/dev/null 2>&1 || true
    msg_ok "$(translate "Prepared CT target path with group and 2775.")"
}