#!/usr/bin/env bash
# Preview the shipped Omarchy installer dashboard without building an ISO.
set -euo pipefail

# The dashboard drives the package phase from the target's pacman database, so
# fake one here; without it the preview falls back to its time curve and the bar
# barely moves, which reads as a bug.
PREVIEW_PACKAGES="${PREVIEW_PACKAGES:-925}"

write_simulation_state() {
  local state_file="$1" started_at="$2" phase_started_at="$3" current_phase="$4"
  local target="$5" index="$6" total="$7"
  local finished_at="${8:-null}" temporary="${state_file}.tmp"

  jq -n \
    --argjson started_at "$started_at" \
    --argjson phase_started_at "$phase_started_at" \
    --arg current_phase "$current_phase" \
    --arg target "$target" \
    --argjson current_index "$index" \
    --argjson total_phases "$total" \
    --argjson finished_at "$finished_at" \
    '{
      started_at: $started_at,
      phase_started_at: $phase_started_at,
      current_phase: $current_phase,
      target: $target,
      current_index: $current_index,
      total_phases: $total_phases
    } + if $finished_at == null then {} else {finished_at: $finished_at} end' \
    >"$temporary"
  mv -f -- "$temporary" "$state_file"
}

# Fill the fake database over the phase's duration, so the bar is driven by the
# same count it uses on a real install.
simulate_packages() {
  local db="$1" duration="$2" total="$3" steps=25 i n
  for ((i = 1; i <= steps; i++)); do
    n=$(( total * i / steps ))
    while (( $(ls -1 "$db" 2>/dev/null | wc -l) < n )); do
      mkdir -p "$db/preview-$(( $(ls -1 "$db" 2>/dev/null | wc -l) ))-1.0-1"
    done
    sleep "$(awk -v d="$duration" -v s="$steps" 'BEGIN { printf "%.3f", d / s }')"
  done
}

simulate_install() {
  local state_file="$1"
  local started_at="$EPOCHREALTIME"
  local phase phase_started_at finished_at duration i index total
  local target db
  target="$(dirname -- "$state_file")/target"
  db="$target/var/lib/pacman/local"
  mkdir -p "$db"
  local -a phases=(
    "Starting installation" 0.5
    "Preparing live environment" 0.8
    "Preparing install target" 0.3
    "Installing Arch + Omarchy" 5.0
    "Configuring hibernation" 0.4
    "Configuring system" 1.2
    "Finalizing Limine boot" 1.0
    "Finalizing user" 1.0
    "Configuring login" 0.6
    "Configuring DNS resolver" 0.3
    "Validating boot setup" 0.8
  )
  total=$(( ${#phases[@]} / 2 ))

  for ((i = 0; i < ${#phases[@]}; i += 2)); do
    phase="${phases[i]}"
    duration="${phases[i + 1]}"
    index=$(( i / 2 ))
    phase_started_at="$EPOCHREALTIME"
    write_simulation_state "$state_file" "$started_at" "$phase_started_at" \
      "$phase" "$target" "$index" "$total"
    if [[ $phase == "Installing Arch + Omarchy" ]]; then
      simulate_packages "$db" "$duration" "$PREVIEW_PACKAGES"
    else
      sleep "$duration"
    fi
  done

  finished_at="$EPOCHREALTIME"
  write_simulation_state "$state_file" "$started_at" "$finished_at" \
    "Installation complete" "$target" "$(( total - 1 ))" "$total" "$finished_at"
  sleep 0.3
}

if [[ ${1:-} == "--simulate-install" ]]; then
  (( $# == 2 )) || exit 2
  simulate_install "$2"
  exit 0
fi

if (( $# > 0 )); then
  echo "Usage: $0" >&2
  exit 2
fi

repo_root="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")/.." && pwd)"
dashboard="$repo_root/configs/airootfs/usr/local/bin/omarchy-install-dashboard"

if [[ ! -x $dashboard ]]; then
  echo "Installer dashboard is not executable: $dashboard" >&2
  exit 1
fi

if [[ -z ${OMARCHY_PATH:-} ]]; then
  for candidate in "$repo_root/../omarchy" /usr/share/omarchy; do
    if [[ -f $candidate/logo.txt ]]; then
      export OMARCHY_PATH="$candidate"
      break
    fi
  done
fi

if [[ -z ${OMARCHY_PATH:-} || ! -f $OMARCHY_PATH/logo.txt ]]; then
  echo "Unable to find Omarchy logo.txt; set OMARCHY_PATH to an Omarchy checkout." >&2
  exit 1
fi

preview_dir="$(mktemp -d)"
cleanup() {
  rm -rf "$preview_dir"
}
trap cleanup EXIT

log_file="$preview_dir/install.log"
state_file="$preview_dir/state.json"
touch "$log_file"

# Match what the simulated database will reach, so the preview shows the
# package-driven bar rather than the missing-signal fallback.
printf '%s\n' "$PREVIEW_PACKAGES" >"$preview_dir/expected-packages"

OMARCHY_UI_AUTO_REBOOT=no \
  OMARCHY_EXPECTED_PACKAGES_FILE="$preview_dir/expected-packages" \
  PREVIEW_PACKAGES="$PREVIEW_PACKAGES" \
  "$dashboard" "$log_file" "$state_file" -- \
  "$0" --simulate-install "$state_file"