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

# === METADATA ===
SCRIPT_NAME="$(basename "$0")"
SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
SKILL_ROOT="$(dirname "$SCRIPT_DIR")"

# === CONFIGURATION ===
: "${OUTPUT_DIR:=$SKILL_ROOT/outputs}"

# === FUNCTIONS ===
log_info()  { echo "[INFO]  $(date -Iseconds) $*"; }
log_warn()  { echo "[WARN]  $(date -Iseconds) $*" >&2; }
log_error() { echo "[ERROR] $(date -Iseconds) $*" >&2; }
die()       { log_error "$@"; exit 1; }

check_file() {
    local path="$1"
    local name="$2"
    if [[ -f "$path" ]]; then
        local size
        size=$(stat -c%s "$path")
        log_info "[OK] $name ($size bytes)"
        return 0
    else
        log_warn "[MISSING] $name"
        return 1
    fi
}

main() {
    local last_run_file="$OUTPUT_DIR/last_run_dir.txt"
    [[ -f "$last_run_file" ]] || die "No last run pointer. Run 11_backup_apply.sh first."

    local run_dir
    run_dir="$(cat "$last_run_file")"

    log_info "Verifying backup artifacts..."
    log_info "Run directory: $run_dir"
    echo ""

    local missing=0

    log_info "=== Core Artifacts ==="
    check_file "$run_dir/archive.tar.gz" "archive.tar.gz" || ((missing++))
    check_file "$run_dir/archive.tar.gz.age" "archive.tar.gz.age" || ((missing++))
    check_file "$run_dir/manifest.json" "manifest.json" || ((missing++))
    echo ""

    log_info "=== Proof Artifacts ==="
    check_file "$run_dir/ROOT.txt" "ROOT.txt" || ((missing++))
    check_file "$run_dir/PROOF.json" "PROOF.json" || ((missing++))
    echo ""

    log_info "=== Metadata ==="
    check_file "$run_dir/excludes.txt" "excludes.txt" || true
    echo ""

    if [[ $missing -gt 0 ]]; then
        die "Verification failed: $missing missing artifacts."
    fi

    log_info "=== ROOT Value ==="
    local root
    root=$(cat "$run_dir/ROOT.txt")
    log_info "ROOT: $root"
    echo ""

    log_info "Verification complete. All artifacts present."
    log_info "Next: ./scripts/50_restore_drill.sh (MANDATORY)"
}

[[ "${BASH_SOURCE[0]}" == "$0" ]] && main "$@"