#!/bin/bash
# ==============================================================================================
# ============================= Media Share Seed ===============================================
# ==============================================================================================
#
# PURPOSE
# ─────────────────────────────────────────────────────────────────────────────
# Pushes every share in this host's DAILY_SYNC_SHARES to the partner with
# Rsync/rsync.sh --seed. Run once after a partnership onboard, when the mirror's
# arr databases know about all the content but the disks behind them are empty.
#
# ==============================================================================================
# WHY THIS IS ITS OWN SCRIPT
# ==============================================================================================
#
# This was Step 9d inside partnership_onboard.sh, running inline. On HOST1 that
# is thirteen shares and roughly 28 TB, and DEFAULT_RSYNC_OPTS caps the transfer
# at --bwlimit=12500 (12.5 MB/s), so a first seed is a multi-week transfer.
#
# Inline, it held the onboard open for all of it — and everything after it in the
# script waited: the webhook listener, the master.conf push, service discovery,
# container grouping, and the HOST<n>_PHASE2_DONE flag that every status reader
# uses to decide the partnership is established. So the owner's card sat on
# "Waiting for HOST2 to install Varaverk and complete onboard" and the mirror's
# checklist sat on "1 required item left: Partnership" for as long as the copy
# took, while the partnership underneath them was already fully wired.
#
# It also meant the onboard job record stayed "running" for weeks, which the
# already-running guard in run_job.sh correctly reads as a reason to refuse every
# subsequent onboard invocation.
#
# Moving the data movement out gives it its own job id, its own log, and its own
# progress in the UI, and lets it be re-run or cancelled without touching onboard.
#
# ==============================================================================================
# DESIGN PRINCIPLES
# ==============================================================================================
#
# Resumable By Construction
#   Every share is a separate rsync.sh call, and rsync.sh runs --inplace --partial.
#   Interrupting this script costs the current file, not the current share, and a
#   re-run picks up where it stopped. Stopping it is cheap; that is deliberate.
#
# Gate Read From Disk
#   RSYNC_ENABLED is read out of master.conf here rather than trusted from the
#   sourced environment. Onboard's Step 9c rewrites that file moments before
#   dispatching this script, and each rsync.sh below sources it fresh anyway.
#   With the gate closed rsync.sh moves nothing and still exits 0, so every share
#   would be counted as seeded — refuse once instead of reporting fourteen no-ops.
#
# One Failed Share Is Not A Failed Seed
#   A share whose backing disk is unmounted on the partner fails its own rsync and
#   is named in the summary. The remaining shares still run. Exit is non-zero only
#   when nothing at all was seeded.
#
# ==============================================================================================
# OPERATIONAL SAFEGUARDS
# ==============================================================================================
#
#   acquire_lock "skip"   — a second seed cannot run beside the first
#   Gate check            — refuses when RSYNC_ENABLED is not true
#   Empty list check      — refuses when DAILY_SYNC_SHARES is empty
#   Per-share accounting  — failures are listed by name, not summed away
#
# ==============================================================================================
# RUNTIME MODES
# ==============================================================================================
#
#   Rsync/media_seed.sh              — seed every DAILY_SYNC_SHARES entry
#   Rsync/media_seed.sh --dry-run    — pass --dry-run down to rsync.sh
#   Rsync/media_seed.sh --log        — verbose output
#
# ==============================================================================================

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
SCRIPTS_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
source "$SCRIPTS_ROOT/load_config.sh"
parse_args "$@"

if [[ "$EUID" -ne 0 ]]; then
    error "Must be run as root"
    exit 1
fi

acquire_lock "skip"
trap "_release_all_locks" EXIT

detect_hosts

START=$(date +%s)

echo ""
echo "━━━ $ICON_SYNC Media Share Seed — $MY_ID ($LOCAL_SERVER_NAME) — $(date '+%Y-%m-%d %H:%M:%S') ━━━"
echo ""

# See "Gate Read From Disk" above. The trailing comment is cut before the value is compared:
# master.conf writes this as `RSYNC_ENABLED=true    # Tier 1 — global gate, overrides everything
# below`, so stopping at `cut -d= -f2` yields "true#Tier1—globalgate,…" and never matches.
_gate=$(grep -m1 -E '^[[:space:]]*RSYNC_ENABLED=' "$SCRIPTS_ROOT/Configurations/master.conf" 2>/dev/null \
        | cut -d= -f2- | cut -d'#' -f1 | tr -d '"'"'" | tr -d '[:space:]')

if [[ "$DRY_RUN" == false && "$_gate" != "true" ]]; then
    error "RSYNC_ENABLED is '${_gate:-unset}' — rsync.sh would move nothing"
    error "Arm it in master.conf, then re-run this script"
    exit 1
fi

if [[ "${#DAILY_SYNC_SHARES[@]}" -eq 0 ]]; then
    error "DAILY_SYNC_SHARES is empty for $MY_ID — nothing to seed"
    error "Configure HOST${MY_ID: -1}_DAILY_SYNC_SHARES in host${MY_ID: -1}.conf"
    exit 1
fi

echo "  Shares:  ${#DAILY_SYNC_SHARES[@]}"
echo "  Note:    a first seed of a full media library runs for days — this is expected"
echo ""

_flags=(--seed)
[[ "$DRY_RUN" == true ]] && _flags+=(--dry-run)
[[ "$ENABLE_LOGGING" == true ]] && _flags+=(--log)

SEEDED=0
FAILED_SHARES=()

for _share in "${DAILY_SYNC_SHARES[@]}"; do
    echo ""
    echo "━━━ Seeding: $_share ━━━"
    if bash "$SCRIPTS_ROOT/Rsync/rsync.sh" "$_share" "${_flags[@]}"; then
        (( SEEDED++ )) || true
    else
        warn "Seed failed for $_share — re-run: Rsync/rsync.sh $_share --seed"
        FAILED_SHARES+=("$_share")
    fi
done
unset _share _flags

END=$(date +%s)
echo ""
echo "━━━━━ $ICON_SUMMARY MEDIA SEED SUMMARY ━━━━━"
echo "  Duration: $(format_duration $(( END - START )))"
echo "  Seeded:   ${SEEDED}/${#DAILY_SYNC_SHARES[@]} share(s)"
if [[ "${#FAILED_SHARES[@]}" -gt 0 ]]; then
    echo "  Failed:   ${FAILED_SHARES[*]}"
fi
echo "━━━━━━━━━━━━━━━━━━━━━━━"

if [[ "$SEEDED" -eq 0 ]]; then
    error "No shares seeded"
    exit 1
fi
[[ "${#FAILED_SHARES[@]}" -gt 0 ]] && exit 1
exit 0