package server

// Render tests for the ux-first-run empty/blocked-state work: the shared
// "emptyState" define (operator_empty_state.html, task 3.1) plus every
// screen that consumes it or its equivalent inline markup (3.2-3.5, 4.1-4.3).
// No DB needed -- these execute the real templates against literal view
// models, mirroring the existing renderGrantsIndex / renderOrgTypesPageBody
// / renderPlanLaddersPageBody pattern (each in this package's own
// *_render_test.go file).

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"
)

// renderOperatorPartial executes one named template from the real operator
// partials set (which auto-loads operator_empty_state.html alongside every
// other operator_*.html file) against data.
func renderOperatorPartial(t *testing.T, name string, data any) string {
	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,
		"stripeEntityURL": func(string, string) string { return "" },
		"fieldErr": func(activeForm, expectedForm, activeScope, expectedScope string, errs web.FieldErrors, field string) string {
			return ""
		},
	})
	tmpl, err = tmpl.ParseFS(partialsSub, "operator_*.html")
	if err != nil {
		t.Fatalf("ParseFS: %v", err)
	}
	var buf bytes.Buffer
	if err := tmpl.ExecuteTemplate(&buf, name, data); err != nil {
		t.Fatalf("ExecuteTemplate %s: %v", name, err)
	}
	return buf.String()
}

// --- 3.1: the shared define itself ---

func TestEmptyStateDefine_Blocked(t *testing.T) {
	out := renderOperatorPartial(t, "emptyState", EmptyStateParams{
		Blocked:           true,
		BlockerCopy:       "A widget must exist first.",
		PrerequisiteURL:   "/operator/widgets",
		PrerequisiteLabel: "Go to Widgets",
	})
	if !strings.Contains(out, "alert-warning") {
		t.Errorf("expected the blocked branch to use the warning alert styling, got:\n%s", out)
	}
	if !strings.Contains(out, "A widget must exist first.") {
		t.Errorf("expected the blocker copy, got:\n%s", out)
	}
	if !strings.Contains(out, `href="/operator/widgets"`) || !strings.Contains(out, "Go to Widgets") {
		t.Errorf("expected the prerequisite link, got:\n%s", out)
	}
}

func TestEmptyStateDefine_NotBlocked(t *testing.T) {
	out := renderOperatorPartial(t, "emptyState", EmptyStateParams{
		Headline:    "No widgets yet.",
		Note:        "Widgets are optional.",
		ActionURL:   "#createWidgetForm",
		ActionLabel: "Create Widget",
	})
	if strings.Contains(out, "alert-warning") {
		t.Errorf("must not use the blocked styling when not blocked, got:\n%s", out)
	}
	if !strings.Contains(out, "No widgets yet.") || !strings.Contains(out, "Widgets are optional.") {
		t.Errorf("expected the headline and note, got:\n%s", out)
	}
	if !strings.Contains(out, `href="#createWidgetForm"`) || !strings.Contains(out, "Create Widget") {
		t.Errorf("expected the primary action, got:\n%s", out)
	}
}

// --- 3.2 / 4.1: Products ---

func TestProductsPartial_Blocked(t *testing.T) {
	out := renderOperatorPartial(t, "operator_products.html", OperatorProductsData{
		EntitlementSetGate: EmptyStateParams{
			Blocked:           true,
			BlockerCopy:       "Products need an entitlement set to define what they deliver. Create one before creating a product.",
			PrerequisiteURL:   "/operator/entitlement-sets",
			PrerequisiteLabel: "Go to Entitlement Sets",
		},
	})
	if strings.Contains(out, `id="createProductForm"`) {
		t.Errorf("must not render the enabled form with no entitlement set to pick, got:\n%s", out)
	}
	if strings.Count(out, "Products need an entitlement set") == 0 {
		t.Errorf("expected the blocked explanation, got:\n%s", out)
	}
	if !strings.Contains(out, `href="/operator/entitlement-sets"`) {
		t.Errorf("expected a link to Entitlement Sets, got:\n%s", out)
	}
}

func TestProductsPartial_EmptyButUnblocked(t *testing.T) {
	out := renderOperatorPartial(t, "operator_products.html", OperatorProductsData{
		EntitlementSets: []EntitlementSetOption{{SetID: "s1", Name: "Standard"}},
		EntitlementSetGate: EmptyStateParams{
			Headline:    "No products yet.",
			ActionURL:   "#createProductForm",
			ActionLabel: "Create Product",
		},
	})
	if !strings.Contains(out, `id="createProductForm"`) {
		t.Errorf("expected the enabled create-product form, got:\n%s", out)
	}
	if !strings.Contains(out, "No products yet.") {
		t.Errorf("expected the actionable empty-list state, got:\n%s", out)
	}
	if strings.Contains(out, "Products need an entitlement set") {
		t.Errorf("must not render blocked copy once a set exists, got:\n%s", out)
	}
}

func TestProductsPartial_NonEmptyListSkipsEmptyState(t *testing.T) {
	out := renderOperatorPartial(t, "operator_products.html", OperatorProductsData{
		EntitlementSets: []EntitlementSetOption{{SetID: "s1", Name: "Standard"}},
		Products:        []OperatorProductViewModel{{ProductID: "p1", Name: "Widget Plan", EntitlementSetName: "Standard"}},
	})
	if strings.Contains(out, "No products yet.") {
		t.Errorf("must not render the empty state when products exist, got:\n%s", out)
	}
	if !strings.Contains(out, "Widget Plan") {
		t.Errorf("expected the product row, got:\n%s", out)
	}
}

// --- 3.4 / 4.3: Entitlement Sets ---

func TestEntitlementSetsPartial_HeaderExplanationSurvivesPastEmptyState(t *testing.T) {
	out := renderOperatorPartial(t, "operator_entitlement_sets.html", EntitlementSetsData{
		EntitlementSets: []EntitlementSetViewModel{{SetID: "s1", Name: "Standard"}},
	})
	if !strings.Contains(out, "every product must reference exactly one set") {
		t.Errorf("expected the always-on header explanation of what a set unlocks, got:\n%s", out)
	}
}

func TestEntitlementSetsPartial_EmptyStateTwoEndedCopy(t *testing.T) {
	out := renderOperatorPartial(t, "operator_entitlement_sets.html", EntitlementSetsData{
		Empty: EmptyStateParams{
			Headline:    "No entitlement sets yet.",
			Note:        "Rules feed into a set, and products consume it. Creating a set is the first step toward a sellable product.",
			ActionURL:   "#createEntitlementSetForm",
			ActionLabel: "Create Entitlement Set",
		},
	})
	if !strings.Contains(out, "Rules feed into a set") || !strings.Contains(out, "products consume it") {
		t.Errorf("expected the two-ended dependency copy, got:\n%s", out)
	}
	if !strings.Contains(out, `href="#createEntitlementSetForm"`) {
		t.Errorf("expected the create action, got:\n%s", out)
	}
}

// --- 3.3: Grants ---

func TestGrantsPartial_BlockedOnZeroPublishedProducts(t *testing.T) {
	out := renderOperatorPartial(t, "operator_grants.html", GrantsData{})
	if !strings.Contains(out, "No grants found.") {
		t.Errorf("expected the base empty-state line to still render (pre-existing contract), got:\n%s", out)
	}
	if !strings.Contains(out, "no product has been published yet") {
		t.Errorf("expected the blocked explanation, got:\n%s", out)
	}
	if !strings.Contains(out, `href="/operator/products"`) {
		t.Errorf("expected a link to Products, got:\n%s", out)
	}
}

func TestGrantsPartial_EmptyPointsAtIssueFlow(t *testing.T) {
	out := renderOperatorPartial(t, "operator_grants.html", GrantsData{
		Products: []ProductViewModel{{ProductID: "p1", Name: "Standard"}},
	})
	if !strings.Contains(out, "issued from each organization's detail page") {
		t.Errorf("expected the empty state to point at the issue flow, got:\n%s", out)
	}
	if strings.Contains(out, "no product has been published yet") {
		t.Errorf("must not render the blocked copy once a product exists, got:\n%s", out)
	}
}

// --- 3.5: Plan Ladders ---

func TestPlanLaddersPartial_EmptyStateActionable(t *testing.T) {
	out := renderOperatorPartial(t, "operator_plan_ladders.html", PlanLaddersData{})
	if !strings.Contains(out, "No plan ladders yet.") {
		t.Errorf("expected the empty headline, got:\n%s", out)
	}
	if !strings.Contains(out, "its tiers get attached to a product") {
		t.Errorf("expected the tiers-need-a-product dependency note, got:\n%s", out)
	}
	if !strings.Contains(out, `href="#createPlanLadderForm"`) {
		t.Errorf("expected an actionable Create Plan Ladder link, got:\n%s", out)
	}
}

// --- 4.2: Org Types card ---

func TestOrgTypeCardPartial_ZeroLaddersShowsPrerequisite(t *testing.T) {
	out := renderOperatorPartial(t, "operator_org_type_card.html", OrgTypeCardData{
		OrgTypeViewModel: OrgTypeViewModel{OrgType: "personal", DisplayName: "Personal", IsActive: true},
	})
	if strings.Contains(out, `name="default_plan_ladder_id"`) {
		t.Errorf("must not render a None-only dropdown when no plan ladders exist, got:\n%s", out)
	}
	if !strings.Contains(out, "must exist before this type can have a default plan") {
		t.Errorf("expected the prerequisite note, got:\n%s", out)
	}
	if !strings.Contains(out, `href="/operator/plan-ladders"`) {
		t.Errorf("expected a link to Plan Ladders, got:\n%s", out)
	}
}

func TestOrgTypeCardPartial_WithLaddersShowsDropdown(t *testing.T) {
	out := renderOperatorPartial(t, "operator_org_type_card.html", OrgTypeCardData{
		OrgTypeViewModel: OrgTypeViewModel{OrgType: "personal", DisplayName: "Personal", IsActive: true},
		PlanLadders:      []PlanLadderOption{{PlanLadderID: "l1", LadderName: "Standard", RankZeroProductName: "Free", HasRankZero: true}},
	})
	if !strings.Contains(out, `name="default_plan_ladder_id"`) {
		t.Errorf("expected the dropdown once plan ladders exist, got:\n%s", out)
	}
	if strings.Contains(out, "must exist before this type can have a default plan") {
		t.Errorf("must not render the prerequisite note once plan ladders exist, got:\n%s", out)
	}
}