#!/usr/bin/env fish
# FKRPG drift check — standalone, Fish-friendly
# Compares LOCAL ≠ PACKWIZ, PRODUCTION ≠ PACKWIZ, LOCAL ≠ PRODUCTION
# via Packwiz index hash + mod filenames

set -l repo (dirname (dirname (realpath (status filename))))
set -l pack_dir "$repo/server_pack"
set -l local_dir "$HOME/.auto-mcs/Servers/FKRPG"
set -l manifest "$repo/optimization-manifest.json"

echo "=== FKRPG DRIFT CHECK ==="
echo "Packwiz: $pack_dir"
echo "Local: $local_dir"
echo "Manifest: $manifest"
echo

# pack hash
set -l pack_hash (grep -E '^\s*hash\s*=' "$pack_dir/pack.toml" | head -n1 | string trim)
echo "PACKWIZ $pack_hash"

# manifest hash
if test -f "$manifest"
    set -l manifest_hash (python3 -c "import json; print(json.load(open('$manifest'))['pack']['index_hash'])" 2>/dev/null)
    echo "MANIFEST index_hash=$manifest_hash"
    if string match -q "*$manifest_hash*" "$pack_hash"
        echo "  -> manifest in-sync"
    else
        echo "  -> DRIFT: manifest != pack.toml (run fish tools/audit.fish --write-manifest)"
    end
else
    echo "MANIFEST missing"
end
echo

# local mods vs packwiz
if test -d "$local_dir/mods"
    set -l local_count (command ls -1 "$local_dir/mods"/*.jar 2>/dev/null | wc -l | string trim)
    set -l pack_count (command ls -1 "$pack_dir/mods"/*.pw.toml 2>/dev/null | wc -l | string trim)
    echo "LOCAL mods: $local_count jars"
    echo "PACKWIZ mods: $pack_count pw.toml"

    # compare filenames (packwiz filenames vs local jars)
    set -l tmp_pack (mktemp)
    set -l tmp_local (mktemp)
    python3 -c "
import glob, re, os
PW=re.compile(r'filename\s*=\s*\"([^\"]+)\"')
for f in glob.glob(os.path.join('$pack_dir', 'mods', '*.pw.toml')):
    for line in open(f):
        m=PW.search(line)
        if m:
            print(m.group(1))
            break
" | sort > $tmp_pack
    python3 -c "
import glob, os
for f in glob.glob(os.path.join('$local_dir', 'mods', '*.jar')):
    print(os.path.basename(f))
" | sort > $tmp_local

    set -l missing (comm -23 $tmp_pack $tmp_local | head -n 20)
    set -l extra (comm -13 $tmp_pack $tmp_local | head -n 20)
    set -l missing_count (comm -23 $tmp_pack $tmp_local | wc -l | string trim)
    set -l extra_count (comm -13 $tmp_pack $tmp_local | wc -l | string trim)

    if test "$missing_count" = "0" -a "$extra_count" = "0"
        echo "DRIFT: LOCAL = PACKWIZ (in-sync)"
    else
        echo "DRIFT DETECTED"
        echo "  Missing in LOCAL ($missing_count):"
        for f in $missing; echo "    - $f"; end
        echo "  Extra in LOCAL ($extra_count):"
        for f in $extra; echo "    - $f"; end
        echo "  Action: Production is outdated or Local is drifted — reinstall from Packwiz export"
    end
    rm $tmp_pack $tmp_local
else
    echo "LOCAL: not found at $local_dir/mods"
end
echo

# production hint (repo/data or server-pack.mrpack)
if test -d "$repo/data/mods"
    set -l prod_count (command ls -1 "$repo/data/mods"/*.jar 2>/dev/null | wc -l | string trim)
    echo "PRODUCTION (repo/data/mods): $prod_count jars"
    echo "  Hint: compare via docker compose file-mount /modpacks/pack.mrpack"
else if test -f "$repo/server-pack.mrpack"
    set -l h (sha256sum "$repo/server-pack.mrpack" 2>/dev/null | cut -c1-16)
    echo "PRODUCTION mrpack: $repo/server-pack.mrpack sha256 $h..."
else
    echo "PRODUCTION: no local hint (check VPS: docker compose exec mc ls /data/mods | wc -l)"
end
echo
echo "Full audit: fish tools/audit.fish --json | jq .drift"