#!/bin/bash
#
# execs.bump end-to-end verification — the manifest version-bump hook.
#
# Builds USM, then drives scratch fixture packages through the whole
# bump-hook story. Every fixture lives OUTSIDE the checkout: the bump
# verb rewrites the CWD's MANIFEST.usm and creates git tags, so it must
# never run inside the USM source tree.
#
# Assertions (each printed PASS/FAIL, exit non-zero on any failure):
#   a. a version bump runs the hook as `<path> <old> <new>` (the hook
#      records its arguments), MANIFEST.usm's version is rewritten, and
#      the version line the hook rewrites in a fixture meson.build is
#      updated
#   b. a failing hook (non-zero exit) aborts the bump with exit 251,
#      leaving MANIFEST.usm and the fixture meson.build untouched
#   c. an explicit bump to the version the manifest already carries
#      does NOT run the hook
#   d. a flags-only bump (--rebuild-dependants, version unchanged) does
#      NOT run the hook, and the flag IS written to the manifest
#   e. a bare --git release (no version argument, no version change)
#      does NOT run the hook, and still commits + tags
#   f. --git with a hook that edits a file: the release commit contains
#      both MANIFEST.usm and the hook-edited file, and tag v<version>
#      exists
#   g. a data-package manifest (flags: ["dataPackage"], acquire + bump
#      execs) may declare the hook; it runs and the version bumps
#
# Environment quirks this script works around (keep in mind when
# running it elsewhere):
#   * The freshly built usm binary links libusm-0.1.so by SONAME, and
#     the host carries an older /opt/usm/lib/libusm-0.1.so — every
#     invocation needs LD_LIBRARY_PATH=<build>/lib or it silently
#     talks to the stale library.
#   * meson only finds the Invercargill libraries through
#     PKG_CONFIG_PATH=/opt/usm/lib/pkgconfig.
#   * The hook is spawned through GLib, which PATH-searches a path
#     with no slash in it: a manifest declaring "bump": "bump.sh"
#     fails to spawn even with the file executable in the CWD. Real
#     manifests place scripts under usm-scripts/, whose slash makes
#     the path CWD-relative — the fixtures do the same.
#   * usm manifest bump --git commits through plain git: without a
#     configured identity it dies with "unable to auto-detect email
#     address". The GIT_AUTHOR_*/GIT_COMMITTER_* exports below give
#     both usm's internal commits and ours one.
#
# Usage: scripts/bump-e2e.sh [build-dir]
#   build-dir defaults to a fresh temp directory; pass an existing meson
#   build directory to skip the (slow) compile.

set -e
set -u
set -o pipefail

SCRIPT_DIR=$(cd -- "$(dirname -- "$0")" && pwd)
SOURCE_DIR=$(cd -- "$SCRIPT_DIR/.." && pwd)

WORK=$(mktemp -d /tmp/usm-bump-e2e.XXXXXX)
trap 'rm -rf "$WORK"' EXIT

PASS_COUNT=0
FAIL_COUNT=0

report() {
    if [ "$1" = 0 ]; then
        printf 'PASS  %s\n' "$2"
        PASS_COUNT=$((PASS_COUNT + 1))
    else
        printf 'FAIL  %s\n' "$2"
        FAIL_COUNT=$((FAIL_COUNT + 1))
    fi
}

# Asserts <description> against <command...>: the command succeeding is
# a PASS, failing is a FAIL (set -e must not abort on a failed
# assertion — the failure is the observation, reported like any other).
try() {
    local description=$1
    shift
    if "$@" >/dev/null 2>&1; then
        report 0 "$description"
    else
        report 1 "$description"
    fi
}

# ---------------------------------------------------------------------------
# 0. Build
# ---------------------------------------------------------------------------

BUILD_DIR=${1:-}

if [ -z "$BUILD_DIR" ]; then
    BUILD_DIR="$WORK/usm-build"
    printf '== Building USM into %s\n' "$BUILD_DIR"
    PKG_CONFIG_PATH=/opt/usm/lib/pkgconfig meson setup "$BUILD_DIR" "$SOURCE_DIR/src" >/dev/null 2>&1 \
        || { echo "meson setup failed"; exit 1; }
    PKG_CONFIG_PATH=/opt/usm/lib/pkgconfig ninja -C "$BUILD_DIR" >/dev/null 2>&1 \
        || { echo "ninja failed"; exit 1; }
fi

USM_BIN="$BUILD_DIR/cli/usm"
[ -x "$USM_BIN" ] || { echo "no usm binary at $USM_BIN"; exit 1; }

# The stale-host-library workaround described in the header
export LD_LIBRARY_PATH="$BUILD_DIR/lib${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}"

# One identity for our git calls and usm's internal release commits
export GIT_AUTHOR_NAME="USM Bump E2E"
export GIT_AUTHOR_EMAIL="bump-e2e@example.invalid"
export GIT_COMMITTER_NAME="$GIT_AUTHOR_NAME"
export GIT_COMMITTER_EMAIL="$GIT_AUTHOR_EMAIL"

# ---------------------------------------------------------------------------
# 1. Fixtures
# ---------------------------------------------------------------------------

# Runs the built usm against one fixture directory; the exit code lands
# in BUMP_EXIT (never aborts the script — a non-zero bump IS the test).
BUMP_EXIT=0
bump() {
    BUMP_EXIT=0
    (cd "$1" && "$USM_BIN" manifest bump "${@:2}") || BUMP_EXIT=$?
}

# A code-package fixture: a manifest declaring the bump hook, the hook
# itself (records "<old> <new>", rewrites the meson.build version line),
# a meson.build carrying the version, and the provided resource.
make_fixture() {
    # make_fixture <dir> <name> <version> <hook>  (hook: record | fail)
    local dir=$1 name=$2 version=$3 hook=$4
    rm -rf "$dir"
    mkdir -p "$dir/usm-scripts"
    cat > "$dir/MANIFEST.usm" <<EOF
{
 "name": "$name",
 "version": "$version",
 "summary": "execs.bump end-to-end fixture",
 "licences": [],
 "flags": [],
 "provides": { "res:$name/hello.txt": "source:hello.txt" },
 "depends": { "runtime": [], "build": [], "manage": ["bin:bash"] },
 "execs": { "bump": "usm-scripts/bump.sh" }
}
EOF
    printf 'fixture payload\n' > "$dir/hello.txt"
    printf "project('%s', 'c', version: '%s')\n" "$name" "$version" > "$dir/meson.build"
    if [ "$hook" = fail ]; then
        cat > "$dir/usm-scripts/bump.sh" <<'EOF'
#!/bin/bash
# Records its arguments, then fails — the bump must abort.
echo "$1 $2" > hook-args.txt
echo "deliberate bump-hook failure" >&2
exit 1
EOF
    else
        cat > "$dir/usm-scripts/bump.sh" <<'EOF'
#!/bin/bash
# Records "<old> <new>", then rewrites the meson.build project version.
echo "$1 $2" > hook-args.txt
sed -i "s/version: '$1'/version: '$2'/" meson.build
EOF
    fi
    chmod +x "$dir/usm-scripts/bump.sh"
}

# Wraps a fixture into a throwaway git repository with everything
# committed, so --git releases have something to tag.
git_init_fixture() {
    (cd "$1" && git init -q && git add -A && git commit -qm "fixture base")
}

FX_A="$WORK/fixture-a"
FX_B="$WORK/fixture-b"
FX_C="$WORK/fixture-c"
FX_E="$WORK/fixture-e"
FX_F="$WORK/fixture-f"
FX_G="$WORK/fixture-g"

make_fixture "$FX_A" bump-e2e-demo 1.0.0 record
make_fixture "$FX_B" bump-e2e-fail 1.0.0 fail
make_fixture "$FX_C" bump-e2e-same 1.0.1 record
make_fixture "$FX_E" bump-e2e-release 1.0.1 record
make_fixture "$FX_F" bump-e2e-git 1.0.1 record
git_init_fixture "$FX_E"
git_init_fixture "$FX_F"

# The data-package fixture: the DATA_MANIFEST shape (acquire + bump are
# the maintainer-side execs a data package may declare) with a VERSION
# file in place of meson.build for the hook to rewrite.
mkdir -p "$FX_G/usm-scripts"
cat > "$FX_G/MANIFEST.usm" <<'EOF'
{
 "name": "bump-e2e-fonts",
 "version": "1.0.0",
 "summary": "Example fonts",
 "licences": [],
 "flags": ["dataPackage"],
 "provides": { "res:bump-e2e-fonts/Example.ttf": "source:Example.ttf" },
 "depends": { "runtime": [], "build": [], "manage": ["bin:bash"] },
 "execs": { "acquire": "usm-scripts/acquire.sh", "bump": "usm-scripts/bump.sh" }
}
EOF
printf 'stub font payload\n' > "$FX_G/Example.ttf"
printf "data-version: '1.0.0'\n" > "$FX_G/VERSION"
printf '#!/bin/bash\nexit 0\n' > "$FX_G/usm-scripts/acquire.sh"
cat > "$FX_G/usm-scripts/bump.sh" <<'EOF'
#!/bin/bash
echo "$1 $2" > hook-args.txt
sed -i "s/data-version: '$1'/data-version: '$2'/" VERSION
EOF
chmod +x "$FX_G/usm-scripts/acquire.sh" "$FX_G/usm-scripts/bump.sh"

# ---------------------------------------------------------------------------
# 2. (a) A version bump runs the hook and rewrites every version line
# ---------------------------------------------------------------------------

printf '== (a) version bump runs the hook\n'
bump "$FX_A" 1.0.1
try "(a) usm manifest bump 1.0.1 exits 0" test "$BUMP_EXIT" = 0
try '(a) hook received the arguments "1.0.0 1.0.1"' \
    test "$(cat "$FX_A/hook-args.txt" 2>/dev/null || true)" = "1.0.0 1.0.1"
try "(a) MANIFEST.usm version rewritten to 1.0.1" \
    grep -Eq '"version"[[:space:]]*:[[:space:]]*"1\.0\.1"' "$FX_A/MANIFEST.usm"
try "(a) meson.build version line rewritten to 1.0.1" \
    grep -q "version: '1.0.1'" "$FX_A/meson.build"

# ---------------------------------------------------------------------------
# 3. (b) A failing hook aborts the bump, leaving the tree untouched
# ---------------------------------------------------------------------------

printf '== (b) failing hook aborts the bump\n'
bump "$FX_B" 1.0.1
try "(b) bump exits 251 when the hook fails" test "$BUMP_EXIT" = 251
try '(b) the hook did run (its arguments were recorded)' \
    test "$(cat "$FX_B/hook-args.txt" 2>/dev/null || true)" = "1.0.0 1.0.1"
try "(b) MANIFEST.usm untouched (still 1.0.0)" \
    grep -Eq '"version"[[:space:]]*:[[:space:]]*"1\.0\.0"' "$FX_B/MANIFEST.usm"
try "(b) meson.build untouched (still 1.0.0)" \
    grep -q "version: '1.0.0'" "$FX_B/meson.build"

# ---------------------------------------------------------------------------
# 4. (c)/(d) No version change — no hook
# ---------------------------------------------------------------------------

printf '== (c) explicit same-version bump\n'
bump "$FX_C" 1.0.1
try "(c) bump 1.0.1 on a 1.0.1 manifest exits 0" test "$BUMP_EXIT" = 0
try "(c) the hook did NOT run" test ! -e "$FX_C/hook-args.txt"
try "(c) MANIFEST.usm still carries 1.0.1" \
    grep -Eq '"version"[[:space:]]*:[[:space:]]*"1\.0\.1"' "$FX_C/MANIFEST.usm"

printf '== (d) flags-only bump\n'
# A flags-only invocation needs the version argument to match the
# manifest (no version and no --git is a usage error), so this bump
# changes nothing but the flags array.
bump "$FX_C" 1.0.1 --rebuild-dependants
try "(d) bump 1.0.1 --rebuild-dependants exits 0" test "$BUMP_EXIT" = 0
try "(d) the hook did NOT run" test ! -e "$FX_C/hook-args.txt"
try "(d) the rebuildDependants flag IS in the manifest" \
    grep -q '"rebuildDependants"' "$FX_C/MANIFEST.usm"

# ---------------------------------------------------------------------------
# 5. (e) A bare --git release does not run the hook
# ---------------------------------------------------------------------------

printf '== (e) bare --git release\n'
bump "$FX_E" --git
try "(e) usm manifest bump --git exits 0" test "$BUMP_EXIT" = 0
try "(e) the hook did NOT run" test ! -e "$FX_E/hook-args.txt"
try "(e) tag v1.0.1 exists" test -n "$(git -C "$FX_E" tag -l "v1.0.1")"
try "(e) meson.build untouched (still 1.0.1)" \
    grep -q "version: '1.0.1'" "$FX_E/meson.build"

# ---------------------------------------------------------------------------
# 6. (f) --git with a hook: the release commit carries the hook's edits
# ---------------------------------------------------------------------------

printf '== (f) --git release after a hook run\n'
bump "$FX_F" patch --git
try "(f) usm manifest bump patch --git exits 0" test "$BUMP_EXIT" = 0
try '(f) hook received the arguments "1.0.1 1.0.2"' \
    test "$(cat "$FX_F/hook-args.txt" 2>/dev/null || true)" = "1.0.1 1.0.2"
try "(f) tag v1.0.2 exists" test -n "$(git -C "$FX_F" tag -l "v1.0.2")"
try "(f) the release commit contains MANIFEST.usm" \
    test -n "$(git -C "$FX_F" show --name-only --format= "v1.0.2" -- MANIFEST.usm)"
try "(f) the release commit contains the hook-edited meson.build" \
    test -n "$(git -C "$FX_F" show --name-only --format= "v1.0.2" -- meson.build)"
try "(f) the tagged meson.build carries the new version" \
    test -n "$(git -C "$FX_F" show "v1.0.2":meson.build | grep "version: '1.0.2'")"

# ---------------------------------------------------------------------------
# 7. (g) A data package may declare and run the bump hook
# ---------------------------------------------------------------------------

printf '== (g) data-package bump hook\n'
bump "$FX_G" 1.0.1
try "(g) data-package bump 1.0.1 exits 0" test "$BUMP_EXIT" = 0
try '(g) hook received the arguments "1.0.0 1.0.1"' \
    test "$(cat "$FX_G/hook-args.txt" 2>/dev/null || true)" = "1.0.0 1.0.1"
try "(g) MANIFEST.usm version rewritten to 1.0.1" \
    grep -Eq '"version"[[:space:]]*:[[:space:]]*"1\.0\.1"' "$FX_G/MANIFEST.usm"
try "(g) the hook's VERSION file rewritten to 1.0.1" \
    grep -q "data-version: '1.0.1'" "$FX_G/VERSION"

# ---------------------------------------------------------------------------

printf '\n%d passed, %d failed\n' "$PASS_COUNT" "$FAIL_COUNT"
if [ "$FAIL_COUNT" -gt 0 ]; then
    exit 1
fi
exit 0