#!/bin/bash
# Migrate hash-based document IDs to date-slug format
# Usage: ./migrate-ids.sh [--dry-run]
set -euo pipefail

DOCSYS_DIR="/srv/docsys"
DB="$DOCSYS_DIR/index/docsys.db"
STORE="$DOCSYS_DIR/store"
RECORDS="$DOCSYS_DIR/records"
DRY_RUN="${1:-}"

migrate() {
    local old_id="$1" new_id="$2"
    
    echo "  $old_id → $new_id"
    
    if [ "$DRY_RUN" = "--dry-run" ]; then return; fi
    
    # Rename store files
    for ext in .pdf .txt .png .md ""; do
        if [ -f "$STORE/$old_id$ext" ]; then
            mv "$STORE/$old_id$ext" "$STORE/$new_id$ext"
            echo "    store: $old_id$ext → $new_id$ext"
        fi
    done
    
    # Update record file if it exists
    local rec=$(sqlite3 "$DB" "SELECT record_path FROM documents WHERE id='$old_id';")
    if [ -n "$rec" ] && [ -f "$rec" ]; then
        local dir=$(dirname "$rec")
        local newrec="$dir/$new_id.md"
        mv "$rec" "$newrec"
        sqlite3 "$DB" "UPDATE documents SET record_path='$newrec' WHERE id='$old_id';"
        echo "    record: $(basename $rec) → $new_id.md"
    fi
    
    # Update DB: documents, embeddings, shares, FTS
    sqlite3 "$DB" "UPDATE documents SET id='$new_id', pdf_path=REPLACE(COALESCE(pdf_path,''),'$old_id','$new_id') WHERE id='$old_id';"
    sqlite3 "$DB" "UPDATE embeddings SET doc_id='$new_id' WHERE doc_id='$old_id';"
    sqlite3 "$DB" "UPDATE shares SET doc_id='$new_id' WHERE doc_id='$old_id';"
    # FTS will be rebuilt on restart
}

echo "=== DocSys ID Migration ==="
[ "$DRY_RUN" = "--dry-run" ] && echo "(DRY RUN - no changes)"
echo

# Stop service
if [ "$DRY_RUN" != "--dry-run" ]; then
    echo "Stopping docsys..."
    systemctl --user stop docsys 2>/dev/null || true
    
    # Backup DB
    cp "$DB" "$DB.bak-$(date +%Y%m%d%H%M%S)"
    echo "DB backed up"
    echo
fi

# Define migrations (old_id new_id)
declare -A RENAMES=(
    ["e37d1295e9505e4a"]="2026-01-07-st-petersburg-utility-bill-jan-2026"
    ["dae28e167002431c"]="2026-02-04-st-petersburg-utility-bill-feb-2026"
    ["9cb67ca54c94a00e"]="2026-02-09-hostkey-hosting-invoice"
    ["b1ba43f7d4b9838f"]="undated-diana-geegan-business-card"
    ["a52c68f7df88a965"]="2026-01-08-fedex-shipping-receipt"
    ["05282dcf1da896a1"]="2026-01-09-parkshore-grill-receipt"
    ["d9cdc7038fb9486d"]="2026-01-15-american-airlines-receipt"
    ["a62399f94087ed04"]="2025-07-01-social-security-retirement-publication"
    ["e569c01b4676add9"]="2025-12-10-valley-bank-heloc-renewal-notice"
    ["2e2ff8472d8afff5"]="2025-12-31-optum-hsa-statement-q4-2025"
    ["f8871fd13b609bbd"]="2025-12-31-voya-retirement-statement-2025"
    ["2b4444a5a92bec9e"]="2025-12-31-alliant-savings-statement"
    ["79ba22cec092fbd8"]="2025-12-31-voya-retirement-account-2025"
    ["2bf818fe2975e1ae"]="2026-01-21-achmea-pension-statement-jan-2026"
    ["da65059758f7be28"]="2025-11-13-miele-microwave-service"
    ["249e08e266ec2216"]="2026-02-03-sellers-net-sheet"
    ["0706a83eef188e5a"]="2025-03-01-nfip-claims-history-report"
    ["5cc409ac61a1af04"]="2025-11-24-umbrella-insurance-invoice"
    ["44d71c266fb381a6"]="2025-11-26-flood-insurance-renewal-notice"
    ["e67d1787863aa29b"]="2025-12-07-selective-flood-renewal-bill"
    ["d8878b9a5b957569"]="2026-01-06-flood-insurance-renewal-notice"
    ["78ab51124773bda5"]="2026-01-21-wright-flood-policy-renewal-2026"
    ["eb4fe6c8236c0e6c"]="2026-01-22-flood-insurance-requirement-notice"
    ["a201962321fd109e"]="2025-03-20-nvc-visa-availability-notice"
    ["be8d89694c05c7da"]="2026-02-09-llc-formation-receipt"
    ["77181a9186c0dc47"]="2025-11-25-baycare-medical-bill-nov-2025"
    ["80d668195458c32e"]="2025-12-25-baycare-medical-bill-a"
    ["4e70650454bb45bb"]="2025-12-25-baycare-medical-bill-b"
    ["c09a129d73e21fe6"]="2026-01-08-sophia-jongsma-medical-bill"
    ["669bdec86f28d83d"]="2025-form-1098-mortgage-interest"
    ["1947d2b3d8ac0437"]="2026-01-06-irs-withholding-compliance-letter"
)

for old_id in "${!RENAMES[@]}"; do
    migrate "$old_id" "${RENAMES[$old_id]}"
done

echo
echo "Done! ${#RENAMES[@]} documents migrated."

if [ "$DRY_RUN" != "--dry-run" ]; then
    echo "Starting docsys..."
    systemctl --user start docsys
    echo "Service started (FTS will rebuild automatically)"
fi