package handlers_test

import (
	"context"
	"net/http"
	"net/http/httptest"
	"strconv"
	"testing"
	"time"

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

// Template data keys the page templates read. The handlers package has
// its own unexported constants for these; this is the external test
// package, so it needs its own.
const (
	dataKeyWebhook = "Webhook"
	dataKeyError   = "Error"
)

// testWebhookID is the identifier given to the webhook under test on
// pages that render one.
const testWebhookID = "wh-1"

// renderPage renders a page template through the real template set as
// an authenticated user and returns the resulting HTML.
func renderPage(
	t *testing.T,
	h *handlers.Handlers,
	sess *session.Session,
	page string,
	data map[string]any,
) string {
	t.Helper()

	cookies := authenticatedCookies(t, sess, "test-user-id", "testuser")

	req := httptest.NewRequestWithContext(
		context.Background(), http.MethodGet, "/", nil,
	)
	for _, c := range cookies {
		req.AddCookie(c)
	}

	w := httptest.NewRecorder()
	h.RenderTemplateForTest(w, req, page, data)

	return w.Body.String()
}

// TestNavbarUsesWebhookTerminology pins the user-visible navigation
// label to "Webhooks". The /sources route is deliberately unchanged, so
// the assertion targets the link text rather than the href.
func TestNavbarUsesWebhookTerminology(t *testing.T) {
	t.Parallel()

	var h *handlers.Handlers

	var sess *session.Session

	app := newTestApp(t, &h, &sess)
	app.RequireStart()

	t.Cleanup(app.RequireStop)

	// One item, so the list body renders too: it calls
	// WebhookListItem.RetentionLabel, promoted from the embedded
	// Webhook and therefore a pointer method. An empty list would
	// skip that call and hide a template error behind the
	// navigation assertions below.
	item := handlers.WebhookListItem{}
	item.Name = "wh"
	item.ID = testWebhookID
	item.RetentionDays = 14

	body := renderPage(t, h, sess, "sources_list.html", map[string]any{
		"Webhooks": []handlers.WebhookListItem{item},
	})

	assert.Contains(t, body, "Retention: 14 days")
	assert.Contains(t, body, `class="btn-text">Webhooks</a>`)
	assert.Contains(
		t, body, `class="btn-text w-full text-left">Webhooks</a>`,
	)
	assert.Contains(
		t, body,
		`<h1 class="text-2xl font-medium text-gray-900">Webhooks</h1>`,
	)
	assert.NotContains(
		t, body, ">Sources<",
		"no user-visible element may still be labelled Sources",
	)
	assert.Contains(
		t, body, `href="/sources"`,
		"the /sources route itself must not change",
	)
}

// TestEditPageUsesWebhookTerminology pins the edit page's heading and
// its back link. The link's href still points at /source/{id}, which is
// intentional: only user-visible copy changes.
func TestEditPageUsesWebhookTerminology(t *testing.T) {
	t.Parallel()

	var h *handlers.Handlers

	var sess *session.Session

	app := newTestApp(t, &h, &sess)
	app.RequireStart()

	t.Cleanup(app.RequireStop)

	// The webhook goes in as a pointer because source_edit.html calls
	// Webhook.RetentionLabel, a pointer method: a map element is not
	// addressable, so a value here renders an error instead of the
	// page.
	webhook := &database.Webhook{Name: "wh", RetentionDays: 14}
	webhook.ID = testWebhookID

	body := renderPage(t, h, sess, "source_edit.html", map[string]any{
		dataKeyWebhook: webhook,
		dataKeyError:   "",
	})

	assert.Contains(t, body, "Edit Webhook")
	assert.NotContains(t, body, ">Sources<")
	assert.Contains(t, body, `href="/source/wh-1"`)
}

// TestCreateFormRetentionCopyMatchesBehaviour pins the create form's
// retention copy to what the code does: the reaper permanently deletes
// events past the cutoff, an empty field falls back to
// DefaultRetentionDays, and 0 is rewritten to the retain-forever
// sentinel by Webhook.BeforeSave.
func TestCreateFormRetentionCopyMatchesBehaviour(t *testing.T) {
	t.Parallel()

	var h *handlers.Handlers

	var sess *session.Session

	app := newTestApp(t, &h, &sess)
	app.RequireStart()

	t.Cleanup(app.RequireStop)

	body := renderPage(t, h, sess, "sources_new.html", map[string]any{
		"Name":                 "",
		"Description":          "",
		"DefaultRetentionDays": database.DefaultRetentionDays,
		dataKeyError:           "",
	})

	assert.Contains(
		t, body,
		"permanently deletes events older than this",
		"the form must say retention is enforced by deletion",
	)
	assert.Contains(t, body, "Enter 0 to retain events forever")
	assert.Contains(
		t, body,
		"leave blank to use the default of "+
			strconv.Itoa(database.DefaultRetentionDays)+" days",
		"blank means the default, not forever",
	)
}

// TestEditFormRetentionCopyMatchesBehaviour pins the edit form's
// retention copy, including that it states the stored policy via
// RetentionLabel and that an empty field leaves that policy unchanged
// rather than meaning forever.
func TestEditFormRetentionCopyMatchesBehaviour(t *testing.T) {
	t.Parallel()

	var h *handlers.Handlers

	var sess *session.Session

	app := newTestApp(t, &h, &sess)
	app.RequireStart()

	t.Cleanup(app.RequireStop)

	finite := &database.Webhook{Name: "wh", RetentionDays: 14}
	finite.ID = testWebhookID

	body := renderPage(t, h, sess, "source_edit.html", map[string]any{
		dataKeyWebhook: finite,
		dataKeyError:   "",
	})

	assert.Contains(t, body, "Currently 14 days.")
	assert.Contains(
		t, body,
		"permanently deletes events older than this",
	)
	assert.Contains(t, body, "Enter 0 to retain events forever")
	assert.Contains(
		t, body,
		"leave blank to keep the current setting",
		"blank means unchanged, not forever",
	)

	forever := &database.Webhook{
		Name:          "wh",
		RetentionDays: database.RetentionForeverDays,
	}
	forever.ID = "wh-2"

	foreverBody := renderPage(
		t, h, sess, "source_edit.html", map[string]any{
			dataKeyWebhook: forever,
			dataKeyError:   "",
		},
	)

	assert.Contains(
		t, foreverBody, "Currently forever.",
		"a retain-forever webhook must not read as a day count",
	)
	assert.Contains(
		t, foreverBody,
		"No events are deleted while retention is set to forever",
	)
	assert.NotContains(
		t, foreverBody,
		"permanently deletes events older than this",
		"the reaper skips retain-forever webhooks, so the form "+
			"must not claim it deletes their events",
	)
}

// TestEntrypointCopyButtonIsProgressiveEnhancement proves the copy
// affordance degrades: the button ships with the hidden attribute, so a
// browser that never runs app.js shows no dead control, and the URL is
// rendered as ordinary selectable text either way.
func TestEntrypointCopyButtonIsProgressiveEnhancement(t *testing.T) {
	t.Parallel()

	var h *handlers.Handlers

	var sess *session.Session

	app := newTestApp(t, &h, &sess)
	app.RequireStart()

	t.Cleanup(app.RequireStop)

	entrypoint := database.Entrypoint{Path: "abc123"}
	entrypoint.ID = "ep-1"

	// The webhook goes in as a pointer because source_detail.html
	// calls Webhook.RetentionLabel, a pointer method: a map element
	// is not addressable, so a value here aborts execution partway
	// down the page, after the copy button has already been flushed
	// to the response.
	webhook := &database.Webhook{Name: "wh", RetentionDays: 14}
	webhook.ID = testWebhookID
	webhook.CreatedAt = time.Date(
		2026, time.January, 2, 3, 4, 5, 0, time.UTC,
	)

	body := renderPage(t, h, sess, "source_detail.html", map[string]any{
		dataKeyWebhook: webhook,
		"Entrypoints":  []database.Entrypoint{entrypoint},
		// The handler passes delivery.NewTargetViews(targets), never
		// raw targets, so the test data has to have that same shape.
		"Targets": delivery.NewTargetViews(nil),
		"Events":  []database.Event{},
		"BaseURL": "https://hooks.example.com",
	})

	assert.Contains(
		t, body,
		`<code id="entrypoint-url-ep-1"`,
	)
	assert.Contains(t, body, "https://hooks.example.com/webhook/abc123")
	assert.Contains(
		t, body,
		`hidden data-copy-target="entrypoint-url-ep-1"`,
		"the button must start hidden and be revealed by script",
	)

	// renderTemplate streams to the ResponseWriter, so an abort
	// midway still leaves everything above it in the body. This pins
	// content from the last line of the template, which is below the
	// assertions above: without it, a page that renders the copy
	// button and then 500s passes.
	assert.Contains(
		t, body, "Retention: 14 days",
		"the page must render to completion, not abort partway",
	)
}