#!/bin/bash
# migrate-log-names.sh — rename (and relocate) pre-existing log files to the
# xamxam-{service}-{date}.log convention under the standard /var/log root.
#
# Why: the app adopted a uniform log naming scheme where production app logs
# live under /var/log/xamxam/ (system standard), nginx under /var/log/nginx/,
# and cron jobs under /var/log/:
#   /var/log/xamxam/xamxam-{channel}-YYYY-MM-DD.log   (app/admin/error/audit)
#   /var/log/nginx/xamxam-nginx-{access,error}.log     (nginx, fixed live name)
#   /var/log/xamxam-{backup,cleanup}-YYYY-MM-DD.log    (cron jobs)
# but logs written before that change still carry the old names/locations
# (storage/logs/admin-*.log, xamxam_error.log, sqlite-backup.log, …). This
# script renames and moves those in place so they follow the same pattern and
# stay visible to the admin log viewer (which globs for xamxam-{channel}-*.log).
#
# Behaviour:
#   - Idempotent: files already matching the target pattern are skipped.
#   - Non-destructive: never overwrites an existing destination. If the
#     destination already exists the source is left untouched and a warning
#     is printed so you can merge/decide manually.
#   - Dry-run by default; pass --apply to actually rename.
#   - Uses each file's own mtime as its date (app/cron logs embed the date in
#     their name already; nginx/cron flat files derive one from mtime).
#
# Usage (run on the server):
#   sudo bash /tmp/migrate-log-names.sh            # preview only
#   sudo bash /tmp/migrate-log-names.sh --apply    # perform the renames
#
# Install: just deploy-script migrate-log-names   (uploads this file to /tmp)

set -euo pipefail

# ── Helpers ────────────────────────────────────────────────────────────────────
RED='\033[0;31m'; GREEN='\033[0;32m'; YELLOW='\033[1;33m'; NC='\033[0m'
info()  { printf "ℹ️  %s\n" "$*"; }
ok()    { printf "${GREEN}✓${NC} %s\n" "$*"; }
warn()  { printf "${YELLOW}!${NC} %s\n" "$*"; }
err()   { printf "${RED}✗${NC} %s\n" "$*" >&2; }

APPLY=0
[ "${1:-}" = "--apply" ] && APPLY=1

APP_LOGS_OLD_DIR="/var/www/xamxam/storage/logs"
APP_LOGS_DIR="/var/log/xamxam"
NGINX_LOGS_DIR="/var/log/nginx"

# ── App channels (Monolog rotating files) ─────────────────────────────────────
# App logs now live under /var/log/xamxam (production). Handle both the old
# location (storage/logs, pre-move) and files already in the new location that
# still carry the old naming (missing xamxam- prefix).
#   Old:  {channel}-YYYY-MM-DD.log        New: xamxam-{channel}-YYYY-MM-DD.log
#   Old bare base also possible: {channel}.log (no date)
CHANNELS=(app admin error audit)
changed=0

for ch in "${CHANNELS[@]}"; do
    # Source directory: prefer the old storage/logs location for files that
    # predate the move; also scan the new /var/log/xamxam in case a previous
    # partial migration already moved (but did not rename) some files.
    for srcdir in "$APP_LOGS_OLD_DIR" "$APP_LOGS_DIR"; do
        [ -d "$srcdir" ] || continue

        # Dated files: {channel}-YYYY-MM-DD.log → xamxam-{channel}-YYYY-MM-DD.log
        for src in "$srcdir"/"$ch"-20[0-9][0-9]-[0-9][0-9]-[0-9][0-9].log; do
            [ -e "$src" ] || continue
            base=$(basename "$src")
            dst="$APP_LOGS_DIR/xamxam-$base"
            if [ -e "$dst" ]; then
                warn "skip (dest exists): $base"
                continue
            fi
            if [ "$APPLY" -eq 1 ]; then
                mv "$src" "$dst" && ok "moved  $srcdir/$base → $dst"
            else
                info "[dry-run] $srcdir/$base → $dst"
            fi
            changed=$((changed + 1))
        done

        # Bare base file (rare, pre-rotation): {channel}.log → xamxam-{channel}.log
        src="$srcdir/$ch.log"
        if [ -f "$src" ]; then
            dst="$APP_LOGS_DIR/xamxam-$ch.log"
            if [ -e "$dst" ]; then
                warn "skip (dest exists): $ch.log"
            elif [ "$APPLY" -eq 1 ]; then
                mv "$src" "$dst" && ok "moved  $srcdir/$ch.log → $dst"
            else
                info "[dry-run] $srcdir/$ch.log → $dst"
            fi
            changed=$((changed + 1))
        fi
    done
done
[ "$changed" -eq 0 ] && info "  none found"

# ── nginx logs (fixed live name + logrotate .N / .N.gz rotations) ─────────────
# Old: xamxam_error.log[.N[.gz]]   New: xamxam-nginx-error.log[.N[.gz]]
# Old: xamxam_access.log[.N[.gz]]  New: xamxam-nginx-access.log[.N[.gz]]
info "nginx logs — $NGINX_LOGS_DIR"
for kind in access error; do
    # Match the live file and any rotations (.1, .2.gz, …)
    for src in "$NGINX_LOGS_DIR"/xamxam_"$kind".log*; do
        [ -e "$src" ] || continue
        base=$(basename "$src")
        # strip the leading xamxam_{kind}.log, keep the rotation suffix
        suffix=${base#xamxam_"$kind".log}
        dst="$NGINX_LOGS_DIR/xamxam-nginx-$kind.log$suffix"
        if [ -e "$dst" ]; then
            warn "skip (dest exists): $base"
            continue
        fi
        if [ "$APPLY" -eq 1 ]; then
            mv "$src" "$dst" && ok "renamed  $base → $(basename "$dst")"
        else
            info "[dry-run] $base → $(basename "$dst")"
        fi
        changed=$((changed + 1))
    done
done

# ── Flat cron logs (derive a date from mtime) ────────────────────────────────
# Old: /var/log/sqlite-backup.log      → /var/log/xamxam-backup-YYYY-MM-DD.log
# Old: /var/log/xamxam-cleanup.log     → /var/log/xamxam-cleanup-YYYY-MM-DD.log
info "cron logs — /var/log"
rename_cron_log() {
    local src="$1" svc="$2"
    [ -f "$src" ] || return 0
    local d
    d=$(date -r "$src" +%Y-%m-%d 2>/dev/null || stat -c %y "$src" | cut -d' ' -f1)
    local dst="/var/log/xamxam-$svc-$d.log"
    if [ -e "$dst" ]; then
        warn "skip (dest exists): $(basename "$src")"
        return 0
    fi
    if [ "$APPLY" -eq 1 ]; then
        mv "$src" "$dst" && ok "renamed  $(basename "$src") → $(basename "$dst")"
    else
        info "[dry-run] $(basename "$src") → $(basename "$dst")"
    fi
    changed=$((changed + 1))
}
rename_cron_log /var/log/sqlite-backup.log backup
rename_cron_log /var/log/xamxam-cleanup.log cleanup

echo ""
if [ "$APPLY" -eq 0 ]; then
    info "Dry-run complete. Re-run with --apply to perform the renames."
else
    ok "Renames complete ($changed changed)."
fi