#!/usr/bin/env bats
# Characterization tests for sync-templates — the mechanism that distributes
# every template change to every project.
#
# These pin CURRENT behavior (record-not-spec) ahead of the guard changes the
# 2026-07-30 propagation incident calls for. That incident is what these exist
# for: an uncommitted edit in rulesets silently blocked all three rsyncs for a
# whole day, and five workflow files went stale in one downstream project alone
# with nothing anywhere reporting it. Any change to this script's guards has to
# come with a red test here first.
#
# Everything runs against fixture directories via SYNC_RULESETS_DIR, so no test
# touches the real rulesets checkout or any real project.

setup() {
    # This suite lives beside the script it tests and travels with it, so it
    # resolves the script relative to itself rather than to a repo root.
    SYNC="$(cd "$(dirname "$BATS_TEST_FILENAME")/.." && pwd)/sync-templates"
    WORK="$(mktemp -d)"
    RS="$WORK/rulesets"
    PROJ="$WORK/proj"
    export SYNC_RULESETS_DIR="$RS"

    # A minimal rulesets fixture: a git repo with the three synced source paths.
    mkdir -p "$RS/claude-templates/.ai/workflows" "$RS/claude-templates/.ai/scripts"
    printf 'canonical protocols\n' > "$RS/claude-templates/.ai/protocols.org"
    printf 'canonical startup\n'   > "$RS/claude-templates/.ai/workflows/startup.org"
    printf 'canonical helper\n'    > "$RS/claude-templates/.ai/scripts/helper"
    # Real rulesets gitignores the python cache paths, so they never make the
    # tree dirty. Without this the fixture diverges from production in a way
    # that silently disarms the exclusion test: the cache files read as
    # untracked, guard one fires, the sync never runs, and assertions that the
    # cache did NOT arrive pass because nothing arrived at all.
    printf '__pycache__/\n.pytest_cache/\n*.pyc\n' > "$RS/.gitignore"
    _mk_repo "$RS"

    # A consuming project with the destination dirs.
    mkdir -p "$PROJ/.ai/workflows" "$PROJ/.ai/scripts"
}

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

_mk_repo() {
    local d="$1"
    git init -q "$d"
    git -C "$d" config user.email t@example.com
    git -C "$d" config user.name tester
    git -C "$d" config commit.gpgsign false
    git -C "$d" config gc.auto 0
    git -C "$d" config maintenance.auto false
    git -C "$d" add -A
    # --allow-empty: the project fixture holds only empty directories, which git
    # has nothing to commit, and these tests need it to be a repo with a HEAD.
    git -C "$d" commit -q --allow-empty -m init
}

# --- the happy path ------------------------------------------------------------

@test "clean rulesets and a non-git project: syncs all three paths" {
    run bash "$SYNC" "$PROJ"
    [ "$status" -eq 0 ]
    [[ "$output" == *"synced from templates"* ]]
    [ "$(cat "$PROJ/.ai/protocols.org")" = "canonical protocols" ]
    [ "$(cat "$PROJ/.ai/workflows/startup.org")" = "canonical startup" ]
    [ "$(cat "$PROJ/.ai/scripts/helper")" = "canonical helper" ]
}

@test "--delete removes a retired template file from the project" {
    printf 'retired\n' > "$PROJ/.ai/workflows/gone.org"
    run bash "$SYNC" "$PROJ"
    [ "$status" -eq 0 ]
    [[ "$output" == *"synced from templates"* ]]
    [ ! -e "$PROJ/.ai/workflows/gone.org" ]
}

@test "the scripts sync excludes python cache artifacts" {
    mkdir -p "$RS/claude-templates/.ai/scripts/__pycache__" \
             "$RS/claude-templates/.ai/scripts/.pytest_cache"
    printf 'junk\n' > "$RS/claude-templates/.ai/scripts/__pycache__/x.pyc"
    printf 'junk\n' > "$RS/claude-templates/.ai/scripts/.pytest_cache/y"
    printf 'junk\n' > "$RS/claude-templates/.ai/scripts/stray.pyc"
    run bash "$SYNC" "$PROJ"
    [ "$status" -eq 0 ]
    # Assert the sync RAN before asserting what it didn't copy. Without this the
    # absences below are satisfied by a skipped sync, and the whole test passes
    # with every --exclude flag deleted from the script.
    [[ "$output" == *"synced from templates"* ]]
    [ -e "$PROJ/.ai/scripts/helper" ]
    [ ! -e "$PROJ/.ai/scripts/__pycache__" ]
    [ ! -e "$PROJ/.ai/scripts/.pytest_cache" ]
    [ ! -e "$PROJ/.ai/scripts/stray.pyc" ]
}

@test "project-owned directories are never touched by the sync" {
    mkdir -p "$PROJ/.ai/project-workflows" "$PROJ/.ai/project-scripts"
    printf 'mine\n' > "$PROJ/.ai/project-workflows/local.org"
    printf 'mine\n' > "$PROJ/.ai/project-scripts/local.py"
    run bash "$SYNC" "$PROJ"
    [ "$status" -eq 0 ]
    [[ "$output" == *"synced from templates"* ]]
    [ "$(cat "$PROJ/.ai/project-workflows/local.org")" = "mine" ]
    [ "$(cat "$PROJ/.ai/project-scripts/local.py")" = "mine" ]
}

# --- guard one: rulesets dirty under the synced paths --------------------------

@test "a dirty synced path in rulesets skips the sync and names the file" {
    printf 'in-flight edit\n' >> "$RS/claude-templates/.ai/workflows/startup.org"
    printf 'stale\n' > "$PROJ/.ai/workflows/startup.org"
    run bash "$SYNC" "$PROJ"
    [ "$status" -eq 0 ]
    [[ "$output" == *"uncommitted changes under the synced template paths"* ]]
    [[ "$output" == *"startup.org"* ]]
    # Nothing propagated — this is the whole-window blast radius from 2026-07-30.
    [ "$(cat "$PROJ/.ai/workflows/startup.org")" = "stale" ]
}

@test "ONE dirty file blocks ALL THREE rsyncs, not just its own" {
    # The 2026-07-30 incident in one assertion: an edit to a workflow file also
    # withheld protocols.org and every script. This is current behavior, and the
    # narrowing change lands by making this test fail on purpose.
    printf 'in-flight edit\n' >> "$RS/claude-templates/.ai/workflows/startup.org"
    printf 'stale protocols\n' > "$PROJ/.ai/protocols.org"
    printf 'stale helper\n' > "$PROJ/.ai/scripts/helper"
    run bash "$SYNC" "$PROJ"
    [ "$status" -eq 0 ]
    [ "$(cat "$PROJ/.ai/protocols.org")" = "stale protocols" ]
    [ "$(cat "$PROJ/.ai/scripts/helper")" = "stale helper" ]
}

@test "an untracked file under a synced path also blocks the sync" {
    printf 'new template\n' > "$RS/claude-templates/.ai/workflows/brand-new.org"
    run bash "$SYNC" "$PROJ"
    [ "$status" -eq 0 ]
    [[ "$output" == *"uncommitted changes under the synced template paths"* ]]
}

@test "rulesets dirt OUTSIDE the synced paths does not block the sync" {
    printf 'scratch\n' > "$RS/scratch.txt"
    printf 'edit\n' >> "$RS/claude-templates/bin-ish.txt"
    run bash "$SYNC" "$PROJ"
    [ "$status" -eq 0 ]
    [[ "$output" == *"synced from templates"* ]]
}

# --- guard two: the project branch is behind its upstream ----------------------

@test "a project behind its upstream skips the sync" {
    _mk_repo "$PROJ"
    git init -q --bare "$WORK/remote"
    git -C "$PROJ" remote add origin "$WORK/remote"
    git -C "$PROJ" push -q -u origin HEAD
    git -C "$PROJ" commit -q --allow-empty -m ahead
    git -C "$PROJ" push -q origin HEAD
    git -C "$PROJ" reset -q --hard HEAD~1
    printf 'stale\n' > "$PROJ/.ai/workflows/startup.org"

    run bash "$SYNC" "$PROJ"
    [ "$status" -eq 0 ]
    [[ "$output" == *"behind upstream"* ]]
    [ "$(cat "$PROJ/.ai/workflows/startup.org")" = "stale" ]
}

@test "a project AHEAD of its upstream still syncs" {
    _mk_repo "$PROJ"
    git init -q --bare "$WORK/remote"
    git -C "$PROJ" remote add origin "$WORK/remote"
    git -C "$PROJ" push -q -u origin HEAD
    git -C "$PROJ" commit -q --allow-empty -m ahead
    run bash "$SYNC" "$PROJ"
    [ "$status" -eq 0 ]
    [[ "$output" == *"synced from templates"* ]]
}

@test "a git project with no upstream syncs (rev-list fails, guard stays off)" {
    _mk_repo "$PROJ"
    run bash "$SYNC" "$PROJ"
    [ "$status" -eq 0 ]
    [[ "$output" == *"synced from templates"* ]]
}

# --- edges ---------------------------------------------------------------------

@test "a nonexistent project directory reports and exits 0 without syncing" {
    run bash "$SYNC" "$WORK/does-not-exist"
    [ "$status" -eq 0 ]
    [[ "$output" == *"cannot enter"* ]]
    [[ "$output" != *"synced from templates"* ]]
    [ ! -e "$WORK/does-not-exist" ]
}

@test "the sync is idempotent — a second run changes nothing" {
    bash "$SYNC" "$PROJ"
    first="$(find "$PROJ/.ai" -type f -exec sha256sum {} + | sort)"
    run bash "$SYNC" "$PROJ"
    [ "$status" -eq 0 ]
    [[ "$output" == *"synced from templates"* ]]
    second="$(find "$PROJ/.ai" -type f -exec sha256sum {} + | sort)"
    [ "$first" = "$second" ]
}

@test "a missing canonical source still reports success — the false-success path" {
    # Faithfully inherited from the inline block, and pinned here because the
    # manifest step depends on it: a last-synced record written after this
    # branch would stamp a successful sync onto one where all three rsyncs
    # failed. The guard work has to fix this before it can trust the record.
    # Point at a rulesets that isn't there at all, rather than deleting the
    # canonical subtree inside a live repo — that would show up as staged
    # deletions and trip guard one, which is a different path entirely.
    SYNC_RULESETS_DIR="$WORK/no-such-rulesets" run bash "$SYNC" "$PROJ"
    [ "$status" -eq 0 ]
    [[ "$output" == *"synced from templates"* ]]
    # Nothing arrived, and the success line says otherwise. Asserted against a
    # file that DOES arrive on a real sync — protocols.org is absent before any
    # sync too, so its absence alone would prove nothing.
    [ ! -e "$PROJ/.ai/scripts/helper" ]
}

@test "a locally-edited template is silently overwritten, with no record kept" {
    # Work's 2026-07-30 regression, pinned: a project patches a rulesets-owned
    # file, the next sync reverts it to canonical, and nothing anywhere says so.
    # The output is indistinguishable from an ordinary successful sync.
    bash "$SYNC" "$PROJ"
    printf 'local fix for a real bug\n' > "$PROJ/.ai/workflows/startup.org"
    run bash "$SYNC" "$PROJ"
    [ "$status" -eq 0 ]
    [ "$(cat "$PROJ/.ai/workflows/startup.org")" = "canonical startup" ]
    [[ "$output" == *"synced from templates"* ]]
    # No warning, no backup, no manifest — the loss leaves no trace at all.
    [[ "$output" != *"overwrote"* ]]
    [[ "$output" != *"local edit"* ]]
    [ ! -d "$PROJ/.ai/.sync-backups" ]
}