package vaultik_test

import (
	"testing"
	"time"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"sneak.berlin/go/vaultik/internal/log"
	"sneak.berlin/go/vaultik/internal/vaultik"
)

// cleanupStaleID is a local snapshot record with no remote manifest —
// the record CleanupLocalSnapshots exists to remove.
const cleanupStaleID = "testhost_home_2026-04-01T09:00:00Z"

// remainingSnapshotLimit bounds the post-cleanup listing. ListRecent
// takes a SQL LIMIT, so it must be positive; the fixtures never exceed
// a handful of rows.
const remainingSnapshotLimit = 100

// cleanupStart is the fixture snapshot's start time. Its exact value is
// irrelevant; only presence in the index matters here.
//
//nolint:gochecknoglobals // read-only fixture shared by the tests below
var cleanupStart = time.Date(2026, 4, 1, 9, 0, 0, 0, time.UTC)

// TestCleanupLocalSnapshots_JSONWritesNothingToStdout is the regression
// guard for issue #108: `vaultik prune --json | jq` failed because this
// function wrote prose to stdout on every branch, ahead of the
// PruneBlobsResult document, with no --json awareness at all.
//
// Both branches are covered because the three writes between them left
// no input that avoided the contamination: with stale records there was
// a line per record plus a summary, and with none there was still the
// "No stale local snapshots found." line.
func TestCleanupLocalSnapshots_JSONWritesNothingToStdout(t *testing.T) {
	log.Initialize(log.Config{})
	t.Parallel()

	for name, seed := range map[string]func(*listEnv){
		"no stale records": func(env *listEnv) {
			// A snapshot present both locally and remotely: nothing to
			// remove, which used to print the "No stale" line.
			env.addLocal(t, listLocalID, cleanupStart)
			env.addRemote(t, listLocalID, cleanupStart)
		},
		"stale records present": func(env *listEnv) {
			env.addLocal(t, cleanupStaleID, cleanupStart)
		},
		"nothing at all": func(_ *listEnv) {},
	} {
		t.Run(name, func(t *testing.T) {
			t.Parallel()

			env := newListEnv(t)
			seed(env)

			err := env.v.CleanupLocalSnapshots(&vaultik.PruneOptions{JSON: true})
			require.NoError(t, err)

			assert.Empty(t, env.stdout.String(),
				"stdout carries the --json document and nothing else")
		})
	}
}

// TestCleanupLocalSnapshots_HumanOutputRetained pins the other half of
// the contract. Without it the test above would be satisfied by
// deleting the three lines outright, and a `vaultik prune` with no
// flags must still say that it removed records from the local index —
// that is the deletion of local state, not decoration.
func TestCleanupLocalSnapshots_HumanOutputRetained(t *testing.T) {
	log.Initialize(log.Config{})
	t.Parallel()

	t.Run("stale records present", func(t *testing.T) {
		t.Parallel()

		env := newListEnv(t)
		env.addLocal(t, cleanupStaleID, cleanupStart)

		err := env.v.CleanupLocalSnapshots(&vaultik.PruneOptions{})
		require.NoError(t, err)

		out := env.stdout.String()

		assert.Contains(t, out, "Removing stale local record: "+cleanupStaleID)
		assert.Contains(t, out, "Removed 1 stale local snapshot record(s).")
	})

	t.Run("no stale records", func(t *testing.T) {
		t.Parallel()

		env := newListEnv(t)
		env.addLocal(t, listLocalID, cleanupStart)
		env.addRemote(t, listLocalID, cleanupStart)

		err := env.v.CleanupLocalSnapshots(&vaultik.PruneOptions{})
		require.NoError(t, err)

		assert.Contains(t, env.stdout.String(),
			"No stale local snapshots found.")
	})
}

// TestCleanupLocalSnapshots_RemovesOnlyStaleRecords checks that the
// --json gate did not change what the function does, only what it
// says: the stale record is gone from the index and the one with a
// remote manifest is untouched.
func TestCleanupLocalSnapshots_RemovesOnlyStaleRecords(t *testing.T) {
	log.Initialize(log.Config{})
	t.Parallel()

	env := newListEnv(t)
	env.addLocal(t, listLocalID, cleanupStart)
	env.addRemote(t, listLocalID, cleanupStart)
	env.addLocal(t, cleanupStaleID, cleanupStart)

	err := env.v.CleanupLocalSnapshots(&vaultik.PruneOptions{JSON: true})
	require.NoError(t, err)

	remaining, err := env.v.Repositories.Snapshots.ListRecent(
		env.v.Context(), remainingSnapshotLimit)
	require.NoError(t, err)

	ids := make([]string, 0, len(remaining))
	for _, snap := range remaining {
		ids = append(ids, snap.ID.String())
	}

	assert.Equal(t, []string{listLocalID}, ids,
		"only the record with no remote manifest may be removed")
}