#!/usr/bin/env bats
# tests/deploy.bats — black-box tests for scripts/deploy.sh (Refs #42)
#
# Contract (see script header): the repo checkout IS the deployment; sync adopts
# identicals, links new files, quarantines-and-replaces divergents, and stows the
# zz-$(hostname) package last. One thing it must NEVER do is deploy generated theme
# output: noctalia rewrites `noctalia.*` / `themes/noctalia*` in place, so a tracked
# copy is a stale snapshot, and a sync would revert a live palette to whatever colour
# scheme was current on the day it was committed.
#
# Nothing is observed except exit status, stdout, the file/symlink shape under $HOME,
# and the quarantine directory.

setup() {
  TEST_TMP="$(mktemp -d)"
  REPO="$TEST_TMP/repo"
  DEPLOY="$BATS_TEST_DIRNAME/../scripts/deploy.sh"
  mkdir -p "$REPO/scripts" "$REPO/dotfiles"
  # A git repo, because the deployment checkout IS one and deploy.sh arms hooksPath.
  git init -q -b main "$REPO"
  cp "$DEPLOY" "$REPO/scripts/deploy.sh"
  chmod +x "$REPO/scripts/deploy.sh"
  export HOME="$TEST_TMP/home"
  mkdir -p "$HOME"
  export DEPLOY_REPO="$REPO" DEPLOY_HOST=box

  # systemctl stub: records every call and answers is-enabled from a file. The real
  # systemctl must never run here — on this box it would start a screen lock.
  mkdir -p "$TEST_TMP/bin"
  export STUB_LOG="$TEST_TMP/systemctl.log" UNIT_STATE="$TEST_TMP/unit-state"
  : > "$STUB_LOG"
  cat > "$TEST_TMP/bin/systemctl" <<'STUB'
#!/usr/bin/env bash
echo "systemctl $*" >> "$STUB_LOG"
if [ "$2" = is-enabled ]; then
  state="$(cat "$UNIT_STATE" 2>/dev/null || echo disabled)"
  printf '%s\n' "$state"
  case "$state" in disabled | "") exit 1 ;; *) exit 0 ;; esac
fi
if [ "$2" = enable ]; then
  # Modelled, not stubbed flat: systemd refuses to enable a unit whose file has no [Install]
  # section, and the deployed file is what it reads. A stub that always says yes hides the
  # one case this repo actually ships (live-sync.service is driven by its timer).
  target=""
  for a in "$@"; do
    case "$a" in
      *.service | *.timer | *.socket) target="$a" ;;
    esac
  done
  file="$HOME/.config/systemd/user/${target##*/}"
  if [ -e "$file" ] && ! grep -q '^\[Install\]' "$file"; then
    printf 'The unit files have no installation config (WantedBy=, RequiredBy=, Also= settings in the [Install] section). This means they are not meant to be enabled using this command.\n' >&2
    exit 1
  fi
fi
STUB
  chmod +x "$TEST_TMP/bin/systemctl"
  export PATH="$TEST_TMP/bin:$PATH"
}

teardown() { rm -rf "$TEST_TMP"; }

# repo_file <pkg-relative path> <content>
repo_file() { mkdir -p "$(dirname "$REPO/dotfiles/$1")"; printf '%s\n' "$2" > "$REPO/dotfiles/$1"; }
# live_file <absolute path under $HOME> <content>
live_file() { mkdir -p "$(dirname "$1")"; printf '%s\n' "$2" > "$1"; }

# systemd_unit <name> <ExecStart> — a unit in the systemd-user package
systemd_unit() {
  mkdir -p "$REPO/dotfiles/systemd-user/.config/systemd/user"
  printf '[Unit]\nDescription=%s\n[Service]\nExecStart=%s\n[Install]\nWantedBy=default.target\n' "$1" "$2" \
    > "$REPO/dotfiles/systemd-user/.config/systemd/user/$1"
}

# systemd_unit_no_install <name> <ExecStart> — a unit nothing can enable (live-sync.service:
# it is pulled in by live-sync.timer, so it carries no [Install] section on purpose).
systemd_unit_no_install() {
  mkdir -p "$REPO/dotfiles/systemd-user/.config/systemd/user"
  printf '[Unit]\nDescription=%s\n[Service]\nType=oneshot\nExecStart=%s\n' "$1" "$2" \
    > "$REPO/dotfiles/systemd-user/.config/systemd/user/$1"
}

# systemd_timer <name> <service-name> — a schedule; it has no ExecStart of its own.
systemd_timer() {
  mkdir -p "$REPO/dotfiles/systemd-user/.config/systemd/user"
  printf '[Unit]\nDescription=%s\n[Timer]\nOnCalendar=hourly\nPersistent=true\n[Install]\nWantedBy=timers.target\n' "$1" \
    > "$REPO/dotfiles/systemd-user/.config/systemd/user/$1"
}

@test "generated theme output is never adopted into a symlink" {
  repo_file "ghostty/.config/ghostty/themes/noctalia" 'background = "#f43841"'
  live_file "$HOME/.config/ghostty/themes/noctalia" 'background = "#f43841"'
  run "$REPO/scripts/deploy.sh"
  [ "$status" -eq 0 ]
  [[ "$output" == *"SKIP"*".config/ghostty/themes/noctalia"* ]]
  [ -f "$HOME/.config/ghostty/themes/noctalia" ]
  [ ! -L "$HOME/.config/ghostty/themes/noctalia" ]
}

@test "a diverged live palette is never quarantined and reverted to a stale copy" {
  # The dangerous shape: the tracked file matches today's palette, the theme changes
  # tomorrow, and sync would quarantine the live file and restore the stale one.
  repo_file "niri/.config/niri/noctalia.kdl" 'active-color "#e01b24"'
  live_file "$HOME/.config/niri/noctalia.kdl" 'active-color "#ff8c00"'
  run "$REPO/scripts/deploy.sh"
  [ "$status" -eq 0 ]
  grep -q 'active-color "#ff8c00"' "$HOME/.config/niri/noctalia.kdl"
  [ ! -L "$HOME/.config/niri/noctalia.kdl" ]
  [ ! -d "$REPO/.quarantine" ]
}

@test "an ordinary identical config is still adopted" {
  # Control against an exclusion so broad the tool stops deploying anything.
  repo_file "ghostty/.config/ghostty/config.ghostty" 'theme = "gruber"'
  live_file "$HOME/.config/ghostty/config.ghostty" 'theme = "gruber"'
  run "$REPO/scripts/deploy.sh"
  [ "$status" -eq 0 ]
  [ -L "$HOME/.config/ghostty/config.ghostty" ]
  [ "$(realpath "$HOME/.config/ghostty/config.ghostty")" = "$(realpath "$REPO/dotfiles/ghostty/.config/ghostty/config.ghostty")" ]
}

@test "--check reports and writes nothing" {
  repo_file "ghostty/.config/ghostty/config.ghostty" 'theme = "gruber"'
  live_file "$HOME/.config/ghostty/config.ghostty" 'theme = "tokyo-night"'
  run "$REPO/scripts/deploy.sh" --check
  [ "$status" -eq 0 ]
  [[ "$output" == *"DRIFT"* || "$output" == *"QUAR"* ]]
  [ ! -L "$HOME/.config/ghostty/config.ghostty" ]
  grep -q 'theme = "tokyo-night"' "$HOME/.config/ghostty/config.ghostty"
  [ ! -d "$REPO/.quarantine" ]
}

@test "a unit already enabled is enabled but not started" {
  systemd_unit lock.service /bin/sh
  printf 'enabled\n' > "$UNIT_STATE"
  run "$REPO/scripts/deploy.sh"
  [ "$status" -eq 0 ]
  [[ "$output" == *"not started"* ]]
  grep -q 'systemctl --user enable lock.service' "$STUB_LOG"
  ! grep -q -- '--now' "$STUB_LOG"
}

@test "a linked unit is not started either" {
  # `is-enabled` exits 1 for a linked unit, exactly as it does for a disabled one, so the
  # printed state is the signal — exit status cannot tell them apart.
  systemd_unit timer-driven.service /bin/sh
  printf 'linked\n' > "$UNIT_STATE"
  run "$REPO/scripts/deploy.sh"
  [ "$status" -eq 0 ]
  ! grep -q -- '--now' "$STUB_LOG"
}

@test "a disabled unit is enabled and started, so a fresh box still comes up" {
  systemd_unit fresh.service /bin/sh
  printf 'disabled\n' > "$UNIT_STATE"
  run "$REPO/scripts/deploy.sh"
  [ "$status" -eq 0 ]
  grep -q 'systemctl --user enable --now fresh.service' "$STUB_LOG"
}

@test "a unit whose ExecStart is absent here stays inert" {
  systemd_unit otherbox.service /nonexistent/daemon
  printf 'disabled\n' > "$UNIT_STATE"
  run "$REPO/scripts/deploy.sh"
  [ "$status" -eq 0 ]
  [[ "$output" == *"SKIP"*otherbox.service* ]]
  ! grep -q enable "$STUB_LOG"
}

@test "a unit whose ExecStart uses a systemd specifier still resolves here" {
  # `%h` is expanded by systemd, not by the shell, so matching the literal string makes a
  # unit belonging to THIS box look foreign and skip it in silence. The victim is this repo's
  # own heartbeat: `ExecStart=%h/.omp/scripts/live-sync.sh`, skipped on every box. Refs #44.
  mkdir -p "$HOME/.local/bin"
  printf '#!/bin/sh\ntrue\n' > "$HOME/.local/bin/helper"
  chmod +x "$HOME/.local/bin/helper"
  systemd_unit heartbeat.service '%h/.local/bin/helper'
  printf 'linked\n' > "$UNIT_STATE"
  run "$REPO/scripts/deploy.sh"
  [ "$status" -eq 0 ]
  [[ "$output" == *"heartbeat.service (already linked"* ]]
  grep -q 'systemctl --user enable heartbeat.service' "$STUB_LOG"
  ! grep -q -- '--now' "$STUB_LOG"
}

@test "a unit nothing can enable is reported as what it is, never as ENABLE" {
  # `systemctl --user enable live-sync.service` fails on every deploy: the file has no
  # [Install] section (its timer arms it), and systemd says so with a non-zero exit. The
  # deploy swallowed that and printed ENABLE, so the one line the operator reads to learn
  # what a rebuild armed was false on every box, on the repo's own heartbeat.
  systemd_unit_no_install heartbeat.service /bin/sh
  printf 'linked\n' > "$UNIT_STATE"
  run "$REPO/scripts/deploy.sh"
  [ "$status" -eq 0 ]
  [[ "$output" == *"heartbeat.service"*"[Install]"* ]]
  [[ "$output" != *"ENABLE heartbeat.service"* ]]
  # No futile call: the section is readable from the file being deployed.
  ! grep -q 'systemctl --user enable heartbeat.service' "$STUB_LOG"
}

@test "a timer in the tier is armed, because a service on its own has no schedule" {
  # The loop walked *.service only. On a rebuilt box live-sync.service is deployed and the
  # timer is never enabled, so the heartbeat that commits machine state simply does not run
  # — and the deploy report says nothing about it.
  systemd_unit heartbeat.service /bin/sh
  systemd_timer heartbeat.timer heartbeat.service
  printf 'disabled\n' > "$UNIT_STATE"
  run "$REPO/scripts/deploy.sh"
  [ "$status" -eq 0 ]
  [[ "$output" != *"SKIP   heartbeat.timer"* ]]
  grep -q 'systemctl --user enable --now heartbeat.timer' "$STUB_LOG"
}