#!/usr/bin/env bash
# Evomedia.net Token Savers — https://github.com/kellymichels/zscripts-token-savers
# Created by Kelly Michels · dev@evomedia.net
# Licensed under the MIT License. See LICENSE.
#
# zbackup — local backups: zip project sources (plus a Postgres dump when the
# project's .env has a DATABASE_URL) into the backups folder.
#
# Usage:
#   zbackup                              # every project in zconfig.json + this scripts folder
#   zbackup <project> [<project> ...]
#   zbackup scripts                      # just this scripts folder ('scripts' is a reserved word)
#   zbackup pyapp --tag "pre-migration"
#
# Output: <paths.backupsLocal>/<project>/<timestamp>_<project>[_tag].zip

set -uo pipefail
source "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/zhelpers.sh"
z_track_start "$@"
z_need_config
z_require zip

projects=(); tag=""
while [ $# -gt 0 ]; do
  case "$1" in
    --tag) tag="${2:-}"; shift 2 ;;
    -*)    err "Unknown option: $1"; exit 1 ;;
    *)     projects+=("$1"); shift ;;
  esac
done

BACKUP_ROOT="$(z_path "$(zq '.paths.backupsLocal')")"
include_scripts=0
if [ "${#projects[@]}" -eq 0 ]; then
  projects=(); while IFS= read -r _zl || [ -n "$_zl" ]; do projects+=("$_zl"); done < <(zproj_keys)
  include_scripts=1
else
  filtered=()
  for p in "${projects[@]}"; do
    if [ "$p" = "scripts" ]; then include_scripts=1; else filtered+=("$p"); fi
  done
  projects=("${filtered[@]+"${filtered[@]}"}")
fi

ts()         { date +%Y%m%d-%H%M%S; }
tag_suffix() { [ -n "$tag" ] && printf '_%s' "$(printf '%s' "$tag" | tr -s '[:space:]' '_')"; }

# Dump the project's Postgres database if its .env declares a DATABASE_URL.
# Checks <root>/.env, then <root>/backend/.env.
# Exit codes:  0 = dumped ($2 written)   1 = dump attempted but failed
#              2 = no local database configured (no .env / no DATABASE_URL)
local_pg_dump() {  # <root> <out_path>
  local root="$1" out="$2" env_file db_url err_out
  env_file="$root/.env"; [ -f "$env_file" ] || env_file="$root/backend/.env"
  [ -f "$env_file" ] || return 2
  db_url="$(grep -m1 '^DATABASE_URL=' "$env_file" | cut -d= -f2- | tr -d '[:space:]')"
  [ -n "$db_url" ] || return 2
  db_url="$(printf '%s' "$db_url" | sed -E 's|^postgresql\+[^:]+://|postgresql://|')"
  if [[ "$db_url" =~ ^postgresql://([^:]+):([^@]+)@([^:]+):([0-9]+)/([^?]+) ]]; then
    local user="${BASH_REMATCH[1]}" pass="${BASH_REMATCH[2]}" host="${BASH_REMATCH[3]}"
    local port="${BASH_REMATCH[4]}" db="${BASH_REMATCH[5]}"
    command -v pg_dump >/dev/null 2>&1 || { err '    pg_dump not installed - skipping PG backup'; return 1; }
    # Capture stderr so a failure is diagnosable (version mismatch, unreachable
    # host, auth) instead of a bare "pg_dump failed".
    if err_out="$(PGPASSWORD="$(z_urldecode "$pass")" pg_dump -h "$host" -p "$port" -U "$user" -d "$db" -F p -f "$out" 2>&1)" \
       && [ -f "$out" ]; then
      ok "    PostgreSQL dump: $(awk -v b="$(wc -c < "$out")" 'BEGIN{printf "%.1f", b/1024}') KB"
      return 0
    fi
    err "    pg_dump failed ($host:$port/$db as $user):"
    printf '%s\n' "$err_out" | grep -v '^[[:space:]]*$' | sed 's/^/      /' >&2
    return 1
  fi
  err '    Could not parse DATABASE_URL - skipping PG backup'
  return 1
}

declare -a summary
exit_code=0

backup_project() {  # <key>
  local key="$1" root out_dir zip_path dump_dir db_dump extra="-"
  zproj_require "$key"
  root="$(zproj_root "$key")"
  out_dir="$BACKUP_ROOT/$key"; mkdir -p "$out_dir"
  zip_path="$out_dir/$(ts)_${key}$(tag_suffix).zip"

  printf '\n'; info "=== [$(printf '%s' "$key" | tr '[:lower:]' '[:upper:]')] Local backup ($(zproj "$key" .label)) ==="
  dim "  Output: $zip_path"
  [ -d "$root" ] || { err "  Root not found: $root"; return 1; }

  dump_dir="$(mktemp -d "${TMPDIR:-/tmp}/zbackup_${key}_XXXXXX")"
  db_dump="$dump_dir/database_pg.sql"
  warn "  [1/3] Checking for a local database to dump..."
  local_pg_dump "$root" "$db_dump"
  case $? in
    0) extra="$db_dump" ;;
    2) dim  "    No local DATABASE_URL - source-only backup." ;;
    *) warn "    Database dump failed (see above) - continuing with source-only backup." ;;
  esac

  warn "  [2/3] Archiving source..."
  local excl=()
  excl=(); while IFS= read -r _zl || [ -n "$_zl" ]; do excl+=("$_zl"); done < <(z_archive_excludes "$key" 1)
  if ! z_archive "$root" "$zip_path" 0 "$extra" "${excl[@]}"; then
    rm -rf "$dump_dir"; return 1
  fi
  rm -rf "$dump_dir"
  warn "  [3/3] Done."
  summary+=("$key -> $zip_path ($(z_size_mb "$zip_path") MB)")
}

backup_scripts() {
  local out_dir zip_path scripts_root
  scripts_root="$(z_path "$(zq '.paths.scriptsRoot')")"
  out_dir="$BACKUP_ROOT/scripts"; mkdir -p "$out_dir"
  zip_path="$out_dir/$(ts)_scripts$(tag_suffix).zip"

  printf '\n'; info "=== [SCRIPTS] Local backup (this scripts folder) ==="
  dim "  Output: $zip_path"
  [ -d "$scripts_root" ] || { err "  Scripts root not found: $scripts_root"; return 1; }

  warn "  [1/2] Archiving source..."
  z_archive "$scripts_root" "$zip_path" 1 "-" .git archive tmp nul || return 1
  warn "  [2/2] Done."
  summary+=("scripts -> $zip_path ($(z_size_mb "$zip_path") MB)")
}

for key in "${projects[@]+"${projects[@]}"}"; do
  backup_project "$key" || { summary+=("$key -> FAILED"); exit_code=1; }
done
if [ "$include_scripts" -eq 1 ]; then
  backup_scripts || { summary+=("scripts -> FAILED"); exit_code=1; }
fi

printf '\n'; info "=== Backup summary ==="
for line in "${summary[@]+"${summary[@]}"}"; do
  case "$line" in *FAILED*) err "  $line" ;; *) ok "  $line" ;; esac
done
printf '\n'
exit "$exit_code"