package handlers_test

import (
	"net/http"
	"net/http/httptest"
	"net/url"
	"os"
	"path/filepath"
	"strings"
	"testing"
	"time"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"sneak.berlin/go/webhooker/internal/database"
	"sneak.berlin/go/webhooker/internal/delivery"
)

// rotationNone is the archive rotation that keeps one file.
const rotationNone = "none"

// rotationShown returns the archive rotations the webhook page's
// target list shows.
func rotationShown(
	t *testing.T, env *sourceTestEnv, webhookID string,
) []string {
	t.Helper()

	return matched(
		`Archive rotation:</span>\s*<span>([^<]*)</span>`,
		renderedPage(t, env, webhookID),
	)
}

// TestArchiveRotationChoices adds a database target with each archive
// rotation the forms offer, and checks that it is stored as chosen,
// shown in the target list, and that the target edit form starts on
// it. It then edits the target to hourly, keeping its expiry.
func TestArchiveRotationChoices(t *testing.T) {
	t.Parallel()

	env := setupSourceTest(t)

	for _, rotation := range []string{rotationNone, "monthly", "daily", "hourly"} {
		t.Run(rotation, func(t *testing.T) {
			t.Parallel()

			webhook := seedWebhookWithRetention(t, env.db, 30)

			form := url.Values{}
			form.Set("name", "archive")
			form.Set("type", string(database.TargetTypeDatabase))
			form.Set("expiry", "720h")
			form.Set("rotation", rotation)

			w := serveTarget(
				env, http.MethodPost, "/hook/"+webhook.ID+"/targets", form,
			)
			require.Equal(t, http.StatusSeeOther, w.Code, w.Body.String())

			targets := targetsForWebhook(t, env.db, webhook.ID)
			require.Len(t, targets, 1)
			assert.JSONEq(t,
				`{"expiry":"720h","rotation":"`+rotation+`"}`,
				targets[0].Config,
			)

			assert.Equal(t,
				[]string{rotation}, rotationShown(t, env, webhook.ID))

			page := targetEditPage(t, env, webhook.ID, targets[0].ID)
			assert.Equal(t, []string{rotation}, selectedIn(page, "rotation"))

			form = url.Values{}
			form.Set("name", "archive")
			form.Set("expiry", "720h")
			form.Set("rotation", "hourly")

			w = submitTargetEdit(env, webhook.ID, targets[0].ID, form)
			require.Equal(t, http.StatusSeeOther, w.Code, w.Body.String())
			assert.JSONEq(t,
				`{"expiry":"720h","rotation":"hourly"}`,
				storedTarget(t, env, targets[0].ID).Config,
			)
		})
	}
}

// TestArchiveRotationEditStartsOnNone checks the edit form of a
// database target with no rotation stored starts on none.
func TestArchiveRotationEditStartsOnNone(t *testing.T) {
	t.Parallel()

	env := setupSourceTest(t)
	webhook := seedWebhookWithRetention(t, env.db, 30)
	target := seedConfiguredTarget(
		t, env.db, webhook.ID, database.TargetTypeDatabase, "",
	)

	page := targetEditPage(t, env, webhook.ID, target.ID)
	assert.Equal(t, []string{rotationNone}, selectedIn(page, "rotation"))
	assert.Equal(t, []string{rotationNone}, rotationShown(t, env, webhook.ID))
}

// TestArchiveRotationRefused proves a rotation that is not one of the
// four is refused on the add target form and the target edit form, and
// that nothing is stored.
func TestArchiveRotationRefused(t *testing.T) {
	t.Parallel()

	env := setupSourceTest(t)
	webhook := seedWebhookWithRetention(t, env.db, 30)

	form := url.Values{}
	form.Set("name", "archive")
	form.Set("type", string(database.TargetTypeDatabase))
	form.Set("rotation", "weekly")

	w := serveTarget(
		env, http.MethodPost, "/hook/"+webhook.ID+"/targets", form,
	)
	assert.Equal(t, http.StatusBadRequest, w.Code)
	assert.Contains(t, w.Body.String(), "Invalid archive rotation")
	assert.Empty(t, targetsForWebhook(t, env.db, webhook.ID))

	target := seedConfiguredTarget(
		t, env.db, webhook.ID, database.TargetTypeDatabase,
		`{"rotation":"daily"}`,
	)

	form.Del("type")

	w = submitTargetEdit(env, webhook.ID, target.ID, form)
	assert.Equal(t, http.StatusBadRequest, w.Code)
	assert.Contains(t, w.Body.String(), "Invalid archive rotation")
	assert.JSONEq(t,
		`{"rotation":"daily"}`, storedTarget(t, env, target.ID).Config,
	)
}

// TestHandleSourceCreateSubmit_ArchiveRotation proves the new webhook
// page's archive rotation is stored on the archive target it creates.
func TestHandleSourceCreateSubmit_ArchiveRotation(t *testing.T) {
	t.Parallel()

	env := setupSourceTest(t)

	form := url.Values{}
	form.Set("name", "rotated")
	form.Set("archive", "on")
	form.Set("archive_expiry", "720h")
	form.Set("archive_rotation", "daily")

	w := submitCreateForm(env, form)
	require.Equal(t, http.StatusSeeOther, w.Code, w.Body.String())

	var webhook database.Webhook

	require.NoError(t, env.db.DB().
		Where("name = ?", "rotated").First(&webhook).Error)

	targets := targetsForWebhook(t, env.db, webhook.ID)
	require.Len(t, targets, 1)
	assert.JSONEq(t,
		`{"expiry":"720h","rotation":"daily"}`, targets[0].Config,
	)
}

// TestArchiveFileView_Rotated describes a daily target's archive files
// at two times. On a day that has a file, the view names that file;
// on the next, before any event, it names the file the next event
// will go to, not created yet. Both times the size is of every file
// together and the last write the latest of them.
func TestArchiveFileView_Rotated(t *testing.T) {
	t.Parallel()

	env := setupSourceTest(t)
	webhook := seedWebhookWithRetention(t, env.db, 30)
	target := seedConfiguredTarget(
		t, env.db, webhook.ID, database.TargetTypeDatabase,
		`{"rotation":"daily"}`,
	)

	path := delivery.ArchivePath(env.dbMgr, &webhook, target)
	stem := strings.TrimSuffix(path, ".db")
	written := time.Date(2026, 10, 2, 9, 0, 0, 0, time.UTC)

	for i, day := range []string{"2026-10-01", "2026-10-02"} {
		file := stem + "-" + day + ".db"
		require.NoError(t, os.WriteFile(file, make([]byte, 1000), 0o600))

		at := written.Add(time.Duration(i-1) * 24 * time.Hour)
		require.NoError(t, os.Chtimes(file, at, at))
	}

	view := env.handlers.ArchiveFileViewForTest(
		&webhook, target, time.Date(2026, 10, 2, 23, 0, 0, 0, time.UTC),
	)
	assert.Equal(t, filepath.Base(stem)+"-2026-10-02.db", view.Name)
	assert.Empty(t, view.Note)
	assert.Equal(t, 2, view.Files)
	assert.Equal(t, "2.0 kB", view.Size)
	assert.Equal(t, "2026-10-02 09:00:00 UTC", view.WrittenUTC)

	view = env.handlers.ArchiveFileViewForTest(
		&webhook, target, time.Date(2026, 10, 3, 0, 0, 0, 0, time.UTC),
	)
	assert.Equal(t, filepath.Base(stem)+"-2026-10-03.db", view.Name)
	assert.Equal(t, "not created yet", view.Note)
	assert.Equal(t, 2, view.Files)
	assert.Equal(t, "2.0 kB", view.Size)

	page := targetList(t, renderedPage(t, env, webhook.ID))
	assert.Contains(t, page, "Archive Size: 2.0 kB in 2 files")
}

// renderedPage returns the webhook page.
func renderedPage(t *testing.T, env *sourceTestEnv, webhookID string) string {
	t.Helper()

	w := httptest.NewRecorder()
	env.handlers.HandleSourceDetail().ServeHTTP(w, getRequest(
		t, "/hook/"+webhookID, env.cookies,
		map[string]string{sourceIDParam: webhookID},
	))
	require.Equal(t, http.StatusOK, w.Code)

	return w.Body.String()
}