package delivery_test

import (
	"context"
	"database/sql"
	"fmt"
	"net/http"
	"net/http/httptest"
	"testing"

	"github.com/google/uuid"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	_ "modernc.org/sqlite"
	"sneak.berlin/go/webhooker/internal/database"
)

// assertNoTargetRows opens the per-webhook database file directly,
// outside GORM, and fails if its targets table holds any rows.
// Target config is the credential for slack and http targets, and
// event databases are the files that get backed up and handed
// around.
func assertNoTargetRows(t *testing.T, dbPath string) {
	t.Helper()

	sqlDB, err := sql.Open(
		"sqlite", fmt.Sprintf("file:%s?mode=ro", dbPath),
	)
	require.NoError(t, err)

	defer func() { _ = sqlDB.Close() }()

	var tables int

	require.NoError(t, sqlDB.QueryRowContext(
		t.Context(),
		"SELECT count(*) FROM sqlite_master "+
			"WHERE type = 'table' AND name = 'targets'",
	).Scan(&tables))

	if tables == 0 {
		return
	}

	var rows int

	require.NoError(t, sqlDB.QueryRowContext(
		t.Context(), "SELECT count(*) FROM targets",
	).Scan(&rows))

	assert.Zero(
		t, rows,
		"per-webhook event database must hold no target rows",
	)
}

// TestEventDBHoldsNoTargetRows drives a delivery and then a retry
// through the real engine write paths and asserts neither leaves a
// target row behind in events-*.db.
func TestEventDBHoldsNoTargetRows(t *testing.T) {
	t.Parallel()

	s := newISetup(t)

	ts := httptest.NewServer(http.HandlerFunc(
		func(w http.ResponseWriter, _ *http.Request) {
			w.WriteHeader(http.StatusOK)
		},
	))
	defer ts.Close()

	cfg := iHTTPConfig(ts.URL)
	targetID := uuid.New().String()
	dbPath := s.DBMgr.DBPath(s.WebhookID)

	event := iSeedEvent(
		t, s.WebhookDB, s.WebhookID, `{"leak":"none"}`,
	)
	body := event.Body

	// A new delivery.
	d := iSeedDelivery(
		t, s.WebhookDB, event.ID, targetID,
		database.DeliveryStatusPending,
	)
	task := iTask(
		d, event, s.WebhookID, targetID,
		"leaky-target", cfg, 5, 1, &body,
	)

	s.Engine.ExportProcessNewTask(context.TODO(), &task)

	iAssertStatus(
		t, s.WebhookDB, d.ID,
		database.DeliveryStatusDelivered,
	)
	assertNoTargetRows(t, dbPath)

	// A retry.
	rd := iSeedDelivery(
		t, s.WebhookDB, event.ID, targetID,
		database.DeliveryStatusRetrying,
	)
	rTask := iTask(
		rd, event, s.WebhookID, targetID,
		"leaky-target", cfg, 5, 2, &body,
	)

	s.Engine.ExportProcessRetryTask(context.TODO(), &rTask)

	iAssertStatus(
		t, s.WebhookDB, rd.ID,
		database.DeliveryStatusDelivered,
	)
	assertNoTargetRows(t, dbPath)
}

// TestEventDBHoldsNoTargetRowsOnFailedDelivery covers the failure
// write path, which updates the delivery to failed and records a
// result, rather than the success path above.
func TestEventDBHoldsNoTargetRowsOnFailedDelivery(t *testing.T) {
	t.Parallel()

	s := newISetup(t)

	ts := httptest.NewServer(http.HandlerFunc(
		func(w http.ResponseWriter, _ *http.Request) {
			w.WriteHeader(http.StatusInternalServerError)
		},
	))
	defer ts.Close()

	cfg := iHTTPConfig(ts.URL)
	targetID := uuid.New().String()

	event := iSeedEvent(
		t, s.WebhookDB, s.WebhookID, `{"leak":"none"}`,
	)
	body := event.Body

	d := iSeedDelivery(
		t, s.WebhookDB, event.ID, targetID,
		database.DeliveryStatusPending,
	)
	task := iTask(
		d, event, s.WebhookID, targetID,
		"leaky-target", cfg, 0, 1, &body,
	)

	s.Engine.ExportProcessNewTask(context.TODO(), &task)

	iAssertStatus(
		t, s.WebhookDB, d.ID,
		database.DeliveryStatusFailed,
	)
	assertNoTargetRows(t, s.DBMgr.DBPath(s.WebhookID))
}