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

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
ROOT_DIR="$(cd "$SCRIPT_DIR/.." && pwd)"

TARGET_HOST="${SYNC_TARGET_HOST:-devone.aplikasi.web.id}"
REMOTE_USER="${SYNC_REMOTE_USER:-one}"
REMOTE_PATH="${SYNC_REMOTE_PATH:-/home/one/project/one/one-api-lab/}"
PRIVATE_KEY_PATH="${SYNC_PRIVATE_KEY_PATH:-/Users/fajrihardhitamurti/id_rsa}"
STATE_FILE="${SYNC_STATE_FILE:-$ROOT_DIR/.git/devone-last-synced-head}"
MODE="${1:-commit}"

log() {
  printf '[devone-sync] %s\n' "$*"
}

fail() {
  printf '[devone-sync] %s\n' "$*" >&2
  exit 1
}

if ! git -C "$ROOT_DIR" rev-parse --is-inside-work-tree >/dev/null 2>&1; then
  exit 0
fi

branch="$(git -C "$ROOT_DIR" symbolic-ref --quiet --short HEAD 2>/dev/null || true)"
if [[ "$branch" != "main" ]]; then
  exit 0
fi

[[ -f "$PRIVATE_KEY_PATH" ]] || fail "Private key not found: $PRIVATE_KEY_PATH"

current_head="$(git -C "$ROOT_DIR" rev-parse HEAD)"
if [[ -f "$STATE_FILE" ]] && [[ "$(cat "$STATE_FILE")" == "$current_head" ]]; then
  exit 0
fi

tmpdir="$(mktemp -d)"
trap 'rm -rf "$tmpdir"' EXIT
changed_list="$tmpdir/changed-files.z"
skipped_list="$tmpdir/skipped-files.txt"

case "$MODE" in
  commit)
    git -C "$ROOT_DIR" diff-tree --no-commit-id --root --diff-filter=ACM --name-only -r -z HEAD > "$changed_list"
    git -C "$ROOT_DIR" diff-tree --no-commit-id --root --diff-filter=DR --summary -r HEAD > "$skipped_list" || true
    ;;
  merge)
    if git -C "$ROOT_DIR" rev-parse -q --verify ORIG_HEAD >/dev/null 2>&1; then
      git -C "$ROOT_DIR" diff --diff-filter=ACM -z --name-only ORIG_HEAD HEAD > "$changed_list"
      git -C "$ROOT_DIR" diff --diff-filter=DR --summary ORIG_HEAD HEAD > "$skipped_list" || true
    else
      git -C "$ROOT_DIR" diff-tree --no-commit-id --root --diff-filter=ACM -r -z HEAD > "$changed_list"
      git -C "$ROOT_DIR" diff-tree --no-commit-id --root --diff-filter=DR --summary -r HEAD > "$skipped_list" || true
    fi
    ;;
  *)
    fail "Unknown mode: $MODE"
    ;;
esac

if [[ ! -s "$changed_list" ]]; then
  if [[ -s "$skipped_list" ]]; then
    log "Skipping delete/rename changes for devone sync:"
    sed 's/^/[devone-sync]   /' "$skipped_list"
  fi
  printf '%s\n' "$current_head" > "$STATE_FILE"
  exit 0
fi

SSH_CMD="ssh -i $PRIVATE_KEY_PATH -o BatchMode=yes -o StrictHostKeyChecking=accept-new"
destination="${REMOTE_USER}@${TARGET_HOST}:${REMOTE_PATH%/}/"

log "Syncing changed files to $destination"
if rsync -az --from0 --files-from="$changed_list" --relative --progress --human-readable --exclude='.git/' --exclude='.DS_Store' -e "$SSH_CMD" "$ROOT_DIR/" "$destination"; then
  printf '%s\n' "$current_head" > "$STATE_FILE"
  if [[ -s "$skipped_list" ]]; then
    log "Skipped delete/rename changes for devone sync:"
    sed 's/^/[devone-sync]   /' "$skipped_list"
  fi
  log "Done: $current_head"
else
  fail "Sync failed"
fi