package server

import (
	"context"
	"database/sql"
	"fmt"
	"html/template"
	"io/fs"
	"log/slog"
	"net"
	"net/http"
	"net/url"
	"strings"
	"time"

	"git.coopcloud.tech/wiki-cafe/member-console/internal/auth"
	"git.coopcloud.tech/wiki-cafe/member-console/internal/billing"
	"git.coopcloud.tech/wiki-cafe/member-console/internal/config"
	"git.coopcloud.tech/wiki-cafe/member-console/internal/domains"
	"git.coopcloud.tech/wiki-cafe/member-console/internal/embeds"
	"git.coopcloud.tech/wiki-cafe/member-console/internal/entitlements"
	"git.coopcloud.tech/wiki-cafe/member-console/internal/fulfillment"
	"git.coopcloud.tech/wiki-cafe/member-console/internal/identity"
	stripedb "git.coopcloud.tech/wiki-cafe/member-console/internal/integrations/stripe/store"
	"git.coopcloud.tech/wiki-cafe/member-console/internal/middleware"
	"git.coopcloud.tech/wiki-cafe/member-console/internal/organization"
	"git.coopcloud.tech/wiki-cafe/member-console/internal/web"
	"github.com/gorilla/csrf"
	"github.com/rs/cors"
	"github.com/spf13/viper"
	"go.temporal.io/sdk/client"
)

// Config holds the configuration for the server.
type Config struct {
	Port                string
	Env                 string
	CSRFSecret          string
	Logger              *slog.Logger
	Database            *sql.DB              // Raw DB connection
	IdentityQ           identity.Querier     // Identity module queries
	OrgQ                organization.Querier // Organization module queries
	EntitlementsQ       entitlements.Querier // Entitlements module queries
	BillingQ            billing.Querier      // Billing module queries
	StripeQ             stripedb.Querier     // Stripe module queries
	DomainsQ            domains.Querier      // Domains registry queries
	TemporalClient      client.Client        // nil if not configured
	StripeWebhookSecret string               // Stripe webhook signing secret
	StripeAPIKey        string               // Stripe API secret key
	StripeDashboardURL  string               // Stripe dashboard base URL for deep links
	BaseURL             string               // Application base URL for redirects
	// AskFallbackURL is the optional legacy on-demand-TLS answerer
	// (domains-ask-fallback-url; empty disables it). Registry misses — and
	// only misses — are forwarded there, so a deployment can move off a
	// filesystem-based answerer incrementally (design.md D5).
	AskFallbackURL string
	// DomainsPolicy is the deployment's claim lifecycle policy (the
	// domains-* core keys). Its zero value is the shipped defaults, so a
	// deployment that configures nothing allocates exactly as the registry
	// constants say (internal/domains.Policy).
	DomainsPolicy domains.Policy
	// DomainsConnectTarget is the DNS target members point external custom
	// domains at (domains-connect-target core key), resolved once by the
	// composition root. Empty disables external domain claims deployment-wide
	// (design D7's two-part gate).
	DomainsConnectTarget string
	// RouteMounts registers each installed integration's HTTP routes (see
	// internal/integrations.RouteProvider). Populated by the composition
	// root (cmd/start.go) from the integration registry; core route
	// construction (below) never names an integration handler type.
	RouteMounts []RouteMount
	// UIMounts registers each installed integration's templates and/or
	// static assets (see internal/integrations.UIProvider). Populated by
	// the composition root (cmd/start.go) from the integration registry.
	UIMounts []UIMount
	// DashboardCards lists each installed integration's member dashboard
	// cards (see DashboardCardProvider). Populated by the composition root
	// (cmd/start.go) from the integration registry, in registry order;
	// index.html renders one generic card shell per entry and core never
	// names an integration in the dashboard.
	DashboardCards []DashboardCard
	// IntegrationConfigs lists each installed integration's declared
	// configuration (internal/config.ConfigProvider) for the operator
	// settings surface. Populated by the composition root (cmd/start.go)
	// from the integration registry — slug, display name, and declared
	// keys only, so core renders every integration's settings page from
	// one handler/template pair and never imports an adapter.
	IntegrationConfigs []IntegrationConfigInfo
}

// IntegrationConfigInfo is one installed integration's declared
// configuration, as the composition root hands it to the operator
// settings surface.
type IntegrationConfigInfo struct {
	Slug        string
	DisplayName string
	// SurfacePath is the integration's operator admin page (manifest
	// OperatorSurfacePath; "" when none) so the settings page can link
	// back to it.
	SurfacePath string
	Keys        []config.ConfigKey
}

// Deps exposes the generic dependencies a registered integration's route
// hook needs to construct its own handlers: the raw DB connection, core
// module queriers, the Temporal client (nil if Temporal isn't configured),
// the auth-setup result (session management, CSRF-aware middleware, role
// checks), and the logger. Integration-specific configuration (FedWiki's
// farm API URL, Stripe's webhook secret, ...) is deliberately not part of
// Deps — each integration reads its own configuration directly for now
// (ConfigProvider-driven binding is a later step), so this struct never
// grows a field per integration.
type Deps struct {
	Database       *sql.DB
	IdentityQ      identity.Querier
	OrgQ           organization.Querier
	EntitlementsQ  entitlements.Querier
	BillingQ       billing.Querier
	TemporalClient client.Client
	AuthConfig     *auth.Config
	Logger         *slog.Logger
	// DomainsPolicy is core configuration, not any integration's: an
	// integration that builds its own domains.Registry (to claim names for
	// its resources) must allocate under the SAME policy core does, and a
	// registry built without it silently falls back to the shipped defaults
	// instead of the deployment's.
	DomainsPolicy domains.Policy
	// DomainsConnectTarget is core configuration for the same reason as
	// DomainsPolicy: an integration offering external-domain entry builds its
	// gate from the SAME resolved value core does, never from a config read
	// of its own (integration-config-parity).
	DomainsConnectTarget string
}

// RouteMount is one integration's contribution to the HTTP server: Register
// constructs and registers its routes against the shared mux once Deps are
// available, and CSRFExemptPaths lists any request paths that must bypass
// CSRF protection (e.g. a webhook authenticated by the provider's own
// signature instead of a CSRF token). Produced from integrations
// implementing RouteProvider (below); Start consumes the slice without
// naming any integration handler type, and CSRF exemptions are declared by
// the route instead of hardcoded in Start.
type RouteMount struct {
	Register        func(mux *http.ServeMux, deps Deps) error
	CSRFExemptPaths []string
}

// UIMount is one installed integration's contribution of templates and/or
// static assets, gathered from integrations implementing
// internal/integrations.UIProvider (either field may be nil for an
// integration that ships only one of the two, or neither — a UIMount is
// only produced when the type assertion against UIProvider succeeds, but
// an implementation is free to return a nil fs.FS from either method).
//
// Templates is parsed into the shared core template set built in Start,
// under the slug-prefix namespacing rule (design.md Decision 8): every
// template name introduced from Templates must be prefixed with Slug, or
// Start fails fast (panics) at boot — this is a startup-time contract
// check on the integration's own asset naming, not a runtime condition,
// so it is deliberately not a recoverable error.
//
// Static is mounted under the existing /static/ route at the per-slug
// subpath /static/<Slug>/ — same-origin, no new route surface, no CSP
// change.
type UIMount struct {
	Slug      string
	Templates fs.FS
	Static    fs.FS
}

// composeUITemplates parses each mount's Templates FS into base and returns
// the extended template set. html/template names a parsed file by its base
// filename absent an explicit {{define}}, so — mirroring the slug-prefix
// rule already followed by the existing fedwiki_*.html templates — every
// "*.html" file a mount contributes must have a filename prefixed with the
// mount's Slug (design.md Decision 8). A violation, or any template parse
// error, panics rather than returning an error: this is a static
// contract-conformance check on the integration's own asset naming — a
// startup-time bug, never a runtime condition — and mirrors the
// template.Must convention Start already uses for the core template set
// this function extends. A mount with a nil or empty Templates FS is a
// no-op.
func composeUITemplates(base *template.Template, mounts []UIMount) *template.Template {
	for _, mount := range mounts {
		if mount.Templates == nil {
			continue
		}
		names, err := fs.Glob(mount.Templates, "*.html")
		if err != nil {
			panic(fmt.Sprintf("integration %q: listing UI templates: %v", mount.Slug, err))
		}
		for _, name := range names {
			if !strings.HasPrefix(name, mount.Slug) {
				panic(fmt.Sprintf(
					"integration %q registered template %q without the required %q slug prefix",
					mount.Slug, name, mount.Slug))
			}
		}
		if len(names) == 0 {
			continue
		}
		base = template.Must(base.ParseFS(mount.Templates, "*.html"))
	}
	return base
}

// RouteProvider is implemented by installed integrations that expose HTTP
// routes; the composition root (cmd/start.go) type-asserts each
// integration from the registry (internal/integrations.All) against this
// interface and turns a match into a RouteMount. It is declared here
// rather than in internal/integrations deliberately: internal/migrate
// imports internal/integrations, and internal/server's own DB-backed
// tests import internal/migrate, so internal/integrations must not import
// internal/server (see that package's doc comment) — the interface lives
// at the point of use instead.
//
// RegisterRoutes constructs the integration's handlers from deps (no core
// code names an integration handler type) and registers them on mux.
// CSRFExemptPaths lists request paths that must bypass CSRF protection
// (e.g. a webhook endpoint authenticated by provider signature instead) —
// the integration declares the exemption itself rather than core
// hardcoding the path.
type RouteProvider interface {
	RegisterRoutes(mux *http.ServeMux, deps Deps) error
	CSRFExemptPaths() []string
}

// DashboardCard is one integration's declared card on the member dashboard.
// The declaration is a shell, not markup: core renders a generic Bootstrap
// card (header from Title, body self-loading via HTMX from PartialPath) and
// everything inside the body stays integration-owned and HTMX-delivered —
// core never renders integration-owned templates inline into the dashboard
// page (no template-set coupling; see the dashboard-display-genericity
// design doc). Modal markup a card needs must arrive inside its partial
// (use hx-preserve so an open modal survives a refresh re-render).
type DashboardCard struct {
	// Title is the card-header text.
	Title string
	// PartialPath is the integration-owned HTMX route the card body loads
	// from on page load.
	PartialPath string
	// RefreshEvent optionally names an event (triggered on <body>, e.g. via
	// an HX-Trigger response header) that re-loads the card body.
	RefreshEvent string
	// Scripts lists page-level script URLs under the integration's
	// /static/<slug>/ mount, rendered as <script defer src> tags in the
	// page head — never inline (CSP), never inside swapped fragments
	// (execution-order dependent).
	Scripts []string
}

// Trigger returns the card body's hx-trigger specification: "load", plus
// the refresh event scoped to <body> when one is declared.
func (c DashboardCard) Trigger() string {
	if c.RefreshEvent == "" {
		return "load"
	}
	return "load, " + c.RefreshEvent + " from:body"
}

// DashboardCardProvider is implemented by installed integrations that
// contribute member dashboard cards. Like RouteProvider above, it is
// declared at the point of use rather than in internal/integrations — the
// same import-cycle rationale applies — and the composition root
// (cmd/start.go) type-asserts each registered integration against it,
// collecting declarations into Config.DashboardCards in registry order.
// An integration without member-facing UI simply doesn't implement this.
// PendingDomainClaim is one in-flight domain verification surfaced by the
// dashboard's pending notice (dissolve-member-domains): just enough to name
// the root and open its DNS instructions via the core claim-status partial.
type PendingDomainClaim struct {
	ClaimID string
	Root    string
}

type DashboardCardProvider interface {
	DashboardCards() []DashboardCard
}

// newRouteAwareHandler builds the top-level request dispatcher implementing
// design.md Decision 4 (spec: error-pages): mux's own registered patterns
// decide whether a request ever reaches authMiddleware at all. Go's
// ServeMux always resolves a path matching no more specific pattern to the
// least-specific one registered — the bare "/" catch-all every deployment
// registers for the dashboard — so a real match returns some OTHER pattern,
// or "/" itself only for the literal root path. Anything else means no
// route recognizes this path, so the styled 404 renders directly: no
// session required, and authMiddleware never runs, so an anonymous visitor
// to a stale or mistyped URL is diagnosed as "not found" rather than
// misread as "signed out" and bounced to the identity provider. A path that
// DOES match a real route keeps the ordinary auth-wrapped dispatch,
// including the login redirect when the session is absent — that behavior
// is unchanged, just moved one layer out.
//
// Extracted as its own function (rather than inlined in Start) so it is
// unit-testable against a small fake mux and a fake auth middleware,
// without standing up the real server's database and session dependencies.
func newRouteAwareHandler(mux *http.ServeMux, authMiddleware func(http.Handler) http.Handler, tmpl *SafeTemplates) http.Handler {
	authWrapped := authMiddleware(mux)
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if _, pattern := mux.Handler(r); pattern == "" || (pattern == "/" && r.URL.Path != "/") {
			tmpl.RenderErrorPage(w, r, http.StatusNotFound, "The page you requested does not exist.")
			return
		}
		authWrapped.ServeHTTP(w, r)
	})
}

// Start initializes and starts the HTTP server.
func Start(ctx context.Context, cfg Config) error {
	// The registry answers /domains/ask below, on the TLS handshake path of
	// every proxy in front of the deployment. A missing querier would mean
	// certificate issuance silently stops, so it is a required dependency
	// rather than a conditional feature.
	if cfg.DomainsQ == nil {
		cfg.Logger.Error("domains registry queries are required to serve /domains/ask")
		return fmt.Errorf("server: Config.DomainsQ is required")
	}

	// Create a new HTTP request router
	httpRequestRouter := http.NewServeMux()

	// Set up authentication with identity and organization query interfaces.
	authConfig, err := auth.Setup(cfg.Database, cfg.IdentityQ, cfg.OrgQ)
	if err != nil {
		cfg.Logger.Error("failed to set up authentication", slog.Any("error", err))
		return err
	}

	// Register auth handlers
	authConfig.RegisterHandlers(httpRequestRouter)

	// Register each installed integration's HTTP routes (FedWiki, the
	// Stripe webhook, ...) via cfg.RouteMounts — see the Deps/RouteMount
	// doc comments above. Core never constructs an integration handler
	// directly; CSRF exemptions are collected from each mount below
	// instead of being hardcoded in the CSRF config.
	deps := Deps{
		Database:             cfg.Database,
		IdentityQ:            cfg.IdentityQ,
		OrgQ:                 cfg.OrgQ,
		EntitlementsQ:        cfg.EntitlementsQ,
		BillingQ:             cfg.BillingQ,
		TemporalClient:       cfg.TemporalClient,
		AuthConfig:           authConfig,
		Logger:               cfg.Logger,
		DomainsPolicy:        cfg.DomainsPolicy,
		DomainsConnectTarget: cfg.DomainsConnectTarget,
	}
	// The serving-authorization endpoint is core's route, not a provider's
	// (spec: domain-authorization; design.md D5): it answers from the
	// domains registry, so no integration is involved in the lookup. Core
	// therefore seeds its own exemption here — the slice was previously
	// assembled only from integration mounts, and it flows to BOTH
	// csrfConfig.Ignore and authConfig.Middleware below. /domains/ask is
	// unauthenticated by design: the TLS-terminating proxy that calls it
	// during a handshake holds no session and no CSRF token.
	// The handler itself is registered further below (after safeTmpl exists):
	// a malformed browser request renders the styled error page (spec:
	// domain-authorization), which needs the parsed template set.
	csrfExemptPaths := []string{"/domains/ask"}

	for _, mount := range cfg.RouteMounts {
		if err := mount.Register(httpRequestRouter, deps); err != nil {
			cfg.Logger.Error("failed to register integration routes", slog.Any("error", err))
			return err
		}
		csrfExemptPaths = append(csrfExemptPaths, mount.CSRFExemptPaths...)
	}

	// Register Operator page handler
	operatorHandler, err := NewOperatorHandler(OperatorHandlerConfig{
		AuthConfig:         authConfig,
		Logger:             cfg.Logger,
		Database:           cfg.Database,
		BillingQ:           cfg.BillingQ,
		EntitlementsQ:      cfg.EntitlementsQ,
		OrgQ:               cfg.OrgQ,
		IdentityQ:          cfg.IdentityQ,
		IntegrationConfigs: cfg.IntegrationConfigs,
	})
	if err != nil {
		cfg.Logger.Error("failed to set up Operator handler", slog.Any("error", err))
		return err
	}
	operatorHandler.RegisterRoutes(httpRequestRouter)

	// Register Operator HTMX partials handlers
	operatorPartialsHandler, err := NewOperatorPartialsHandler(OperatorPartialsConfig{
		EntitlementsQ:      cfg.EntitlementsQ,
		BillingQ:           cfg.BillingQ,
		StripeQ:            cfg.StripeQ,
		Database:           cfg.Database,
		IdentityQ:          cfg.IdentityQ,
		OrgQ:               cfg.OrgQ,
		Logger:             cfg.Logger,
		AuthConfig:         authConfig,
		StripeDashboardURL: cfg.StripeDashboardURL,
		StripeConfigured:   cfg.StripeAPIKey != "" && cfg.StripeWebhookSecret != "",
		TemporalClient:     cfg.TemporalClient,
		// The operator Domains surface reads and moderates claims through
		// the registry, under the deployment's policy — the same policy the
		// member surface allocates under, since the page prints it as the
		// effective one.
		Registry:           domains.NewRegistry(cfg.Database, domains.WithPolicy(cfg.DomainsPolicy)),
		IntegrationConfigs: cfg.IntegrationConfigs,
	})
	if err != nil {
		cfg.Logger.Error("failed to set up Operator partials handler", slog.Any("error", err))
		return err
	}
	operatorPartialsHandler.RegisterRoutes(httpRequestRouter)

	// Register Workspace partials handlers
	workspacePartialsHandler, err := NewWorkspacePartialsHandler(WorkspacePartialsConfig{
		OrgQ:          cfg.OrgQ,
		EntitlementsQ: cfg.EntitlementsQ,
		Database:      cfg.Database,
		AuthConfig:    authConfig,
		Logger:        cfg.Logger,
	})
	if err != nil {
		cfg.Logger.Error("failed to set up Workspace partials handler", slog.Any("error", err))
		return err
	}
	workspacePartialsHandler.RegisterRoutes(httpRequestRouter)

	// Register Member Products partials handlers
	memberProductsHandler, err := NewMemberProductsHandler(MemberProductsConfig{
		EntitlementsQ: cfg.EntitlementsQ,
		BillingQ:      cfg.BillingQ,
		AuthConfig:    authConfig,
		Logger:        cfg.Logger,
		Database:      cfg.Database,
	})
	if err != nil {
		cfg.Logger.Error("failed to set up Member Products handler", slog.Any("error", err))
		return err
	}
	memberProductsHandler.RegisterRoutes(httpRequestRouter)

	// Register Member Invoices partials handler (Billing page)
	memberInvoicesHandler, err := NewMemberInvoicesHandler(MemberInvoicesConfig{
		BillingQ:   cfg.BillingQ,
		AuthConfig: authConfig,
		Logger:     cfg.Logger,
	})
	if err != nil {
		cfg.Logger.Error("failed to set up Member Invoices handler", slog.Any("error", err))
		return err
	}
	memberInvoicesHandler.RegisterRoutes(httpRequestRouter)

	// Register Member Domains partials handler (Domains page). The connect
	// target is the domains-connect-target core key, resolved once by the
	// composition root (design D7): an empty value disables external claims
	// deployment-wide.
	memberDomainsHandler, err := NewMemberDomainsHandler(MemberDomainsConfig{
		DomainsQ: cfg.DomainsQ,
		// Member-facing registry: MUST carry the external-claim gate so
		// ClaimExternal enforces the plan gate itself
		// (centralize-external-claim-gate).
		Registry: domains.NewRegistry(cfg.Database, domains.WithPolicy(cfg.DomainsPolicy),
			domains.WithExternalClaimGate(NewExternalClaimGate(cfg.EntitlementsQ, cfg.DomainsConnectTarget))),
		EntitlementsQ:  cfg.EntitlementsQ,
		TemporalClient: cfg.TemporalClient,
		AuthConfig:     authConfig,
		Logger:         cfg.Logger,
		ConnectTarget:  cfg.DomainsConnectTarget,
	})
	if err != nil {
		cfg.Logger.Error("failed to set up Member Domains handler", slog.Any("error", err))
		return err
	}
	memberDomainsHandler.RegisterRoutes(httpRequestRouter)

	// Register billing checkout handler. The stripe-go package-level API key
	// is set exactly once, by the Stripe integration's Startup hook
	// (internal/integrations/stripe.Adapter.Startup) — not here (design.md
	// Decision 5; openspec/changes/integration-extraction task 3.4).
	if cfg.StripeAPIKey != "" {
		billingCheckout := &BillingCheckoutHandler{
			Database:   cfg.Database,
			BillingQ:   cfg.BillingQ,
			AuthConfig: authConfig,
			Logger:     cfg.Logger,
			BaseURL:    cfg.BaseURL,
		}
		httpRequestRouter.HandleFunc("POST /billing/checkout", billingCheckout.HandleCheckout)
	}

	// Create CORS configuration with default options
	corsOptions := cors.Options{
		// Define minimal defaults - GET method is required
		AllowedMethods: []string{"GET"},
	}

	// Create empty CSRF configuration with default values
	var csrfConfig middleware.CSRFConfig

	// Get and validate CSRF secret from config
	csrfKey, err := middleware.ParseCSRFKey(cfg.CSRFSecret)
	if err != nil {
		cfg.Logger.Error("invalid csrf-secret",
			slog.String("error", err.Error()),
			slog.String("hint", "must be exactly 32 bytes and persist across restarts"))
		return err
	}

	csrfConfig.Secret = csrfKey

	// Bypass CSRF for the exempt paths collected above: core's own
	// /domains/ask (called by a TLS proxy mid-handshake) plus whatever each
	// integration declared via RouteMount.CSRFExemptPaths (e.g. the Stripe
	// webhook, which verifies its own provider signature instead of a CSRF
	// token) — declared by the route, not hardcoded here.
	for _, exemptPath := range csrfExemptPaths {
		exemptPath := exemptPath
		csrfConfig.Ignore = append(csrfConfig.Ignore, func(r *http.Request) bool {
			return r.URL.Path == exemptPath
		})
	}

	// Add CSRF error handler for debugging
	csrfConfig.ErrorHandler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		cfg.Logger.Error("CSRF validation failed",
			slog.String("path", r.URL.Path),
			slog.String("method", r.Method),
			slog.String("reason", csrf.FailureReason(r).Error()),
			slog.String("origin", r.Header.Get("Origin")),
			slog.String("referer", r.Header.Get("Referer")))
		// Include "CSRF" in response for client-side detection
		// This allows the frontend to preserve user input and show a helpful message
		http.Error(w, "CSRF token invalid or expired. Please refresh the page.", http.StatusForbidden)
	})

	// Only override specific settings when needed
	if cfg.Env == "development" {
		// In development, cookies often need to work without HTTPS
		csrfConfig.Cookie.Secure = false
	}

	// Always set cookie path to "/" to avoid multiple CSRF cookies with different paths
	// Without this, gorilla/csrf creates separate cookies for different URL paths,
	// causing token mismatches (e.g., token from "/" doesn't match cookie from "/partials/fedwiki")
	csrfConfig.Cookie.Path = "/"

	// Add base URL as trusted origin for CSRF validation
	// gorilla/csrf expects just host:port, not the full URL with scheme
	baseURL := viper.GetString("base-url")
	if baseURL != "" {
		// Parse the URL to extract just the host
		if parsed, err := url.Parse(baseURL); err == nil && parsed.Host != "" {
			csrfConfig.TrustedOrigins = []string{parsed.Host}
			cfg.Logger.Info("CSRF trusted origins configured", slog.Any("origins", csrfConfig.TrustedOrigins))
		}
	}

	// For embedded templates
	templateSubFS, err := fs.Sub(embeds.Templates, "templates")
	if err != nil {
		cfg.Logger.Error("Failed to create sub filesystem for templates", slog.Any("error", err))
		return err
	}

	// Parse templates from embedded FS. The glob picks up operator.html
	// which references the `renderBody` template func from operator_pages.go;
	// register a stub here so parse succeeds. The real implementation is
	// wired up in NewOperatorPartialsHandler's own template set. routeURL is
	// registered for real (not stubbed) because this set is also where
	// cfg.UIMounts' templates land (composeUITemplates below) — an
	// integration's own templates parsed into this set may reference it,
	// as FedWiki's do (fedwiki_sites.html, fedwiki_delete_confirm.html).
	tmpl := template.Must(template.New("root").Funcs(template.FuncMap{
		"renderBody":     func(string, any) (template.HTML, error) { return "", nil },
		"routeURL":       web.RouteURL,
		"deploymentName": config.DeploymentName,
	}).ParseFS(templateSubFS, "*.html"))

	// Compose in each installed integration's templates (cfg.UIMounts —
	// see the UIMount doc comment). FedWiki's member-card templates ride
	// this seam (as any integration's may); slug-prefix validation guards
	// the namespace.
	tmpl = composeUITemplates(tmpl, cfg.UIMounts)
	safeTmpl := NewSafeTemplates(tmpl, cfg.Logger)

	httpRequestRouter.HandleFunc("GET /domains/ask", DomainAskHandler(
		domains.NewRegistryAuthorizer(cfg.DomainsQ, cfg.AskFallbackURL, cfg.Logger), cfg.Logger, safeTmpl))

	// Create the middleware stack that runs on EVERY request, matched route
	// or not. Auth is deliberately excluded here — it is applied separately,
	// below, only once a request is known to match a real route. That split
	// is what lets an anonymous visit to an unmatched path reach the styled
	// 404 without a session (design.md Decision 4; spec: error-pages).
	preAuthStack := middleware.CreateStack(
		middleware.RequestID(), // Generate a unique request ID
		middleware.Logging(),   // Log requests with structured logging
		// Catch all panics; the styled 500 page never echoes the panic value
		middleware.Recovery(func(w http.ResponseWriter, r *http.Request) {
			safeTmpl.RenderErrorPage(w, r, http.StatusInternalServerError, "An unexpected error occurred. Please try again.")
		}),
		middleware.Timeout(32*time.Second),    // Set request timeout
		middleware.MaxBodySize(1024*1024),     // 1MB size limit
		middleware.SecureHeaders(),            // Set secure headers
		middleware.CORS(corsOptions),          // CORS configuration
		middleware.CSRF(csrfConfig),           // CSRF protection
		middleware.Compress(),                 // Response compression
		authConfig.SessionManager.LoadAndSave, // Session management (must be before auth middleware)
	)

	// Signature-verified integration endpoints (webhooks) bypass session
	// auth — without this, provider deliveries 302 to /login (caught
	// live: Discourse webhook, 2026-07-20). newRouteAwareHandler only runs
	// this for requests it has already confirmed match a real pattern.
	routeAware := newRouteAwareHandler(httpRequestRouter, authConfig.Middleware(csrfExemptPaths...), safeTmpl)

	// Create HTTP server
	server := http.Server{
		Addr:           ":" + cfg.Port,
		Handler:        preAuthStack(routeAware),
		ReadTimeout:    4 * time.Second,
		WriteTimeout:   8 * time.Second,
		IdleTimeout:    16 * time.Second,
		MaxHeaderBytes: 1024 * 1024,                                         // 1MB
		BaseContext:    func(_ net.Listener) context.Context { return ctx }, // Pass base context to all requests
	}

	// Guard: any unmatched /partials/ path returns 404 rather than falling
	// through to the "/" catch-all (which would serve the dashboard HTML
	// inside an HTMX swap target — silently broken). Specific /partials/
	// routes registered above this line still take precedence because Go's
	// ServeMux prefers longer/more-specific patterns.
	httpRequestRouter.HandleFunc("/partials/", func(w http.ResponseWriter, r *http.Request) {
		safeTmpl.RenderErrorPage(w, r, http.StatusNotFound, "The page you requested does not exist.")
	})

	// Serve index.html via template rendering
	httpRequestRouter.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		// The "/" pattern matches every otherwise-unrouted path. Only the
		// dashboard URL itself is valid here; anything else is a 404, not a
		// silently served dashboard.
		if r.URL.Path != "/" {
			safeTmpl.RenderErrorPage(w, r, http.StatusNotFound, "The page you requested does not exist.")
			return
		}

		// Always serve HTML
		w.Header().Set("Content-Type", "text/html; charset=utf-8")

		// Get session data
		ctx := r.Context()
		name := authConfig.GetUserName(ctx)
		username := authConfig.GetUsername(ctx)
		email := authConfig.GetUserEmail(ctx)

		// Create Keycloak Account URL
		keycloakAccountURL := viper.GetString("oidc-idp-issuer-url") + "/account"

		// Get CSRF token for HTMX requests
		csrfToken := middleware.CSRFToken(r)

		// Check if user has operator role
		isOperator := authConfig.HasRole(r, OperatorRole)

		// Check workspace count for progressive disclosure
		hasMultipleWorkspaces := false
		session := authConfig.GetUserSession(ctx)
		if session != nil {
			wsCount, err := cfg.OrgQ.CountWorkspacesByOrgID(ctx, session.OrgID)
			if err == nil && wsCount > 1 {
				hasMultipleWorkspaces = true
			}
		}

		// Pending domain claims (dissolve-member-domains): with the standalone
		// Domains page gone, the dashboard is the durable re-entry point for a
		// claim whose DNS verification is still in flight. Best-effort — a
		// lookup failure only costs the notice, never the page.
		var pendingDomainClaims []PendingDomainClaim
		if session != nil {
			claims, err := cfg.DomainsQ.ListLiveClaimsByWorkspace(ctx, session.WorkspaceID)
			if err != nil {
				cfg.Logger.Warn("dashboard: pending domain claims lookup failed",
					slog.String("workspace_id", session.WorkspaceID), slog.Any("error", err))
			}
			for _, c := range claims {
				if c.Status == domains.StatusPending {
					pendingDomainClaims = append(pendingDomainClaims, PendingDomainClaim{
						ClaimID: c.ClaimID, Root: c.RootFqdn,
					})
				}
			}
		}

		// Post-checkout return banner. Stripe Checkout redirects back to
		// "/?checkout=success|cancel". Only recognize the known values; plan
		// activation is driven asynchronously by the checkout.session.completed
		// webhook, so "success" reports payment received, not an applied tier.
		checkoutStatus := ""
		switch r.URL.Query().Get("checkout") {
		case "success":
			checkoutStatus = "success"
		case "cancel":
			checkoutStatus = "cancel"
		}

		// On a successful return, eagerly reconcile the member's latest Stripe
		// subscription so a freshly purchased plan reflects immediately, without
		// waiting on webhook delivery. Best-effort: see eagerReconcileOnReturn.
		if checkoutStatus == "success" && cfg.StripeAPIKey != "" && session != nil {
			eagerReconcileOnReturn(ctx, cfg, session.OrgID)
		}

		data := struct {
			Name                  string
			Username              string
			Email                 string
			KeycloakAccountURL    string
			CSRFToken             string
			IsOperator            bool
			HasMultipleWorkspaces bool
			CheckoutStatus        string
			DashboardCards        []DashboardCard
			PendingDomainClaims   []PendingDomainClaim
		}{Name: name, Username: username, Email: email, KeycloakAccountURL: keycloakAccountURL, CSRFToken: csrfToken, IsOperator: isOperator, HasMultipleWorkspaces: hasMultipleWorkspaces, CheckoutStatus: checkoutStatus, DashboardCards: cfg.DashboardCards, PendingDomainClaims: pendingDomainClaims}

		safeTmpl.Render(w, "index.html", data)
	})

	// Serve products.html via template rendering
	httpRequestRouter.HandleFunc("GET /products", func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "text/html; charset=utf-8")

		keycloakAccountURL := viper.GetString("oidc-idp-issuer-url") + "/account"
		csrfToken := middleware.CSRFToken(r)
		isOperator := authConfig.HasRole(r, OperatorRole)

		data := struct {
			KeycloakAccountURL string
			CSRFToken          string
			IsOperator         bool
		}{KeycloakAccountURL: keycloakAccountURL, CSRFToken: csrfToken, IsOperator: isOperator}

		safeTmpl.Render(w, "products.html", data)
	})

	// Serve billing.html (member invoice & payment history) via template rendering
	httpRequestRouter.HandleFunc("GET /billing", func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "text/html; charset=utf-8")

		keycloakAccountURL := viper.GetString("oidc-idp-issuer-url") + "/account"
		csrfToken := middleware.CSRFToken(r)
		isOperator := authConfig.HasRole(r, OperatorRole)

		data := struct {
			KeycloakAccountURL string
			CSRFToken          string
			IsOperator         bool
		}{KeycloakAccountURL: keycloakAccountURL, CSRFToken: csrfToken, IsOperator: isOperator}

		safeTmpl.Render(w, "billing.html", data)
	})

	// The standalone member Domains page is dissolved (dissolve-member-domains):
	// claims are managed at point of use, in the Domains section nested inside
	// the FedWiki Sites dashboard card, all via the same /partials/domains/...
	// routes registered above. Stale links and bookmarks land on that section's
	// fragment anchor (ux-ia-naming D7) rather than a bare dashboard redirect,
	// so a member following a domains link lands on domains content, not just
	// the dashboard.
	httpRequestRouter.HandleFunc("GET /domains", func(w http.ResponseWriter, r *http.Request) {
		http.Redirect(w, r, "/#domains", http.StatusFound)
	})

	// For embedded static files
	httpRequestRouter.Handle("/static/", http.FileServer(http.FS(embeds.Static)))

	// Mount each installed integration's static assets (cfg.UIMounts) under
	// the existing /static/ route at its own /static/<slug>/ subpath — same
	// origin, no new route surface, no CSP change. No integration supplies
	// static assets yet, so this loop is currently a no-op.
	for _, mount := range cfg.UIMounts {
		if mount.Static == nil {
			continue
		}
		prefix := "/static/" + mount.Slug + "/"
		httpRequestRouter.Handle(prefix, http.StripPrefix(prefix, http.FileServer(http.FS(mount.Static))))
	}

	// Log server startup with structured logging
	cfg.Logger.Info("starting server",
		slog.String("port", cfg.Port),
		slog.String("environment", cfg.Env),
		slog.String("address", "http://localhost:"+cfg.Port))

	// Start server and log any errors
	if err := server.ListenAndServe(); err != nil {
		cfg.Logger.Error("server error", slog.Any("error", err))
		return err
	}
	return nil
}

// eagerReconcileOnReturn reconciles the org's latest Stripe subscription after a
// successful checkout return, so a freshly purchased plan reflects immediately
// rather than waiting on webhook delivery. It is best-effort: any failure is
// logged and never surfaced to the member, since the webhook path remains
// responsible for eventual consistency. Runs under a short timeout so the
// dashboard render is never blocked.
func eagerReconcileOnReturn(ctx context.Context, cfg Config, orgID string) {
	accounts, err := billing.New(cfg.Database).ListBillingAccountsByOrgID(ctx, orgID)
	if err != nil {
		cfg.Logger.Warn("eager reconcile: list billing accounts",
			slog.String("org_id", orgID), slog.Any("error", err))
		return
	}
	if len(accounts) == 0 {
		return
	}

	mapping, err := stripedb.New(cfg.Database).GetCustomerMappingByBillingAccountID(ctx, accounts[0].BillingAccountID)
	if err != nil || !mapping.StripeCustomerID.Valid {
		return // no synced customer mapping yet — nothing to reconcile
	}

	rctx, cancel := context.WithTimeout(ctx, 5*time.Second)
	defer cancel()
	if err := fulfillment.ReconcileLatestSubscriptionForCustomer(
		rctx, cfg.Database, cfg.Logger, mapping.StripeCustomerID.String, "eager:checkout-return",
	); err != nil {
		cfg.Logger.Warn("eager reconcile on checkout return failed (webhook will reconcile)",
			slog.String("org_id", orgID), slog.Any("error", err))
	}
}