package server

import (
	"bytes"
	"html/template"
	"io/fs"
	"strings"
	"testing"

	"git.coopcloud.tech/wiki-cafe/member-console/internal/embeds"
	"git.coopcloud.tech/wiki-cafe/member-console/internal/web"
)

// billingTestTemplates parses the operator partial set the way
// NewOperatorPartialsHandler does, with renderBody stubbed, so both the
// wrapper and the inner per-view tables can be rendered in isolation.
func billingTestTemplates(t *testing.T) *template.Template {
	t.Helper()
	partialsSub, err := fs.Sub(embeds.Templates, "templates/partials")
	if err != nil {
		t.Fatalf("fs.Sub partials: %v", err)
	}
	tmpl := template.New("operator").Funcs(template.FuncMap{
		"renderBody":      func(string, any) (template.HTML, error) { return "", nil },
		"routeURL":        web.RouteURL,
		"fieldErr":        func(_, _, _, _ string, _, _ any) string { return "" },
		"stripeEntityURL": func(string, string) string { return "" },
	})
	tmpl, err = tmpl.ParseFS(partialsSub, "operator_*.html")
	if err != nil {
		t.Fatalf("ParseFS: %v", err)
	}
	return tmpl
}

// renderOperatorBilling executes the real operator_billing.html wrapper
// template. renderBody is stubbed (as in other isolated partial render
// tests): it exercises the wrapper's own markup (nav pills, the
// webhook-recency stamp), not the inner per-view tables.
func renderOperatorBilling(t *testing.T, data OperatorBillingWrapperData) string {
	t.Helper()
	var buf bytes.Buffer
	if err := billingTestTemplates(t).ExecuteTemplate(&buf, "operator_billing.html", data); err != nil {
		t.Fatalf("ExecuteTemplate: %v", err)
	}
	return buf.String()
}

// TestOperatorBillingNotMappedVocabularyIsDefinedInPlace covers
// operator-billing-views ("Stripe sync vocabulary is defined where it
// appears", revised by maintainer 2026-08-23 from an always-on wrapper
// banner to the dense-surface pattern): each view's "Stripe Sync" column
// header carries a help icon whose tooltip defines the vocabulary and says
// what to do about an unmapped record; the wrapper renders no legend banner.
func TestOperatorBillingNotMappedVocabularyIsDefinedInPlace(t *testing.T) {
	var buf bytes.Buffer
	if err := billingTestTemplates(t).ExecuteTemplate(&buf, "operator_billing_accounts.html", BillingAccountsData{
		Accounts: []BillingAccountViewModel{{BillingAccountID: "ba1", OrgID: "org1", OrgName: "Acme", Name: "Default", Status: "active", StripeSyncStatus: "not_mapped", CreatedAt: "Jan 2, 2026"}},
		Nav:      ListNav{BasePath: "/operator/billing/accounts", Page: 1, Total: 1},
	}); err != nil {
		t.Fatalf("ExecuteTemplate: %v", err)
	}
	out := buf.String()
	if !strings.Contains(out, "form-help-icon") {
		t.Error("Stripe Sync header must carry the help icon")
	}
	if !strings.Contains(out, "Not Mapped means none is linked yet") {
		t.Error("tooltip does not state what an unmapped record means")
	}
	if !strings.Contains(out, "Stripe integration settings") {
		t.Error("tooltip does not say what to do about an unmapped record")
	}

	wrapper := renderOperatorBilling(t, OperatorBillingWrapperData{
		ActiveSection: "accounts",
		InnerTemplate: "operator_billing_accounts.html",
		DataAsOf:      "Jan 2, 2026 15:04 MST",
	})
	if strings.Contains(wrapper, "alert-secondary") || strings.Contains(wrapper, "shows whether a row has a linked Stripe object") {
		t.Error("the wrapper must not render the retired always-on legend banner")
	}
}

// TestOperatorBillingPillNav covers operator-billing-views ("Billing views
// are navigated in-page"; maintainer 2026-08-23 — the sidebar holds one flat
// Billing entry, so the wrapper's pill row is the section's navigation): all
// four views render as pills, exactly the active section's pill is marked,
// and the recency stamp and Stripe Sync legend still render alongside.
func TestOperatorBillingPillNav(t *testing.T) {
	out := renderOperatorBilling(t, OperatorBillingWrapperData{
		ActiveSection: "invoices",
		InnerTemplate: "operator_invoices.html",
		DataAsOf:      "Jan 2, 2026 15:04 MST",
	})
	if !strings.Contains(out, "nav-pills") {
		t.Fatalf("billing wrapper must render the nav-pills section navigation, got:\n%s", out)
	}
	for view, path := range map[string]string{
		"Accounts":      "/operator/billing/accounts",
		"Subscriptions": "/operator/billing/subscriptions",
		"Invoices":      "/operator/billing/invoices",
		"Payments":      "/operator/billing/payments",
	} {
		if !strings.Contains(out, `href="`+path+`">`+view+`</a>`) {
			t.Errorf("billing pill nav missing the %s view link (%s), got:\n%s", view, path, out)
		}
	}
	if got := strings.Count(out, `nav-link active`); got != 1 {
		t.Errorf("exactly one billing pill must be active, got %d in:\n%s", got, out)
	}
	if !strings.Contains(out, `active" href="/operator/billing/invoices"`) {
		t.Errorf("the active pill must be the ActiveSection (invoices), got:\n%s", out)
	}
	if !strings.Contains(out, "Last updated at Jan 2, 2026 15:04 MST") {
		t.Errorf("recency stamp must render alongside the pill nav, got:\n%s", out)
	}
}

// TestOperatorBillingRecencyStamp covers the operator-billing-views delta's
// projection-recency requirement (design.md Decision 3; task 4.2): every
// billing sub-page states when data was last projected, or states plainly
// that nothing has been received yet, rather than presenting rows or
// emptiness as if current.
func TestOperatorBillingRecencyStamp(t *testing.T) {
	t.Run("recency stamp renders with data", func(t *testing.T) {
		out := renderOperatorBilling(t, OperatorBillingWrapperData{
			ActiveSection: "invoices",
			InnerTemplate: "operator_invoices.html",
			DataAsOf:      "Jan 2, 2026 15:04 MST",
		})
		if !strings.Contains(out, "Last updated at Jan 2, 2026 15:04 MST") {
			t.Errorf("recency stamp missing or malformed: %s", out)
		}
		if strings.Contains(out, "No billing events have been received") {
			t.Error("no-events copy rendered even though DataAsOf was set")
		}
	})

	t.Run("no events ever processed is stated", func(t *testing.T) {
		out := renderOperatorBilling(t, OperatorBillingWrapperData{
			ActiveSection:     "payments",
			InnerTemplate:     "operator_payments.html",
			NoEventsProcessed: true,
		})
		if !strings.Contains(out, "No billing events have been received") {
			t.Errorf("missing the no-events-ever statement: %s", out)
		}
		if strings.Contains(out, "Last updated at") {
			t.Error("stale last-updated copy rendered with no processed events")
		}
	})
}