package server

import (
	"context"
	"net/http"
	"time"

	"gitea.meghsakha.com/platform/tenant-registry/internal/store"
)

// catalog is hard-coded for now. PRODUCT_INTEGRATION_SPEC.md §10 has products
// publish a manifest to `cdn.breakpilot.com`; this list will be sourced
// from those manifests once M6.3 / M7.2 wire it up.
var catalog = []store.CatalogEntry{
	{
		Key: "certifai", Name: "CERTifAI",
		Description:   "Self-hosted GDPR-compliant AI dashboard.",
		PlansRequired: []string{"professional", "enterprise"},
		SupportsTrial: true,
	},
	{
		Key: "compliance", Name: "Compliance",
		Description:   "DSFA / TOM / VVT generation; evidence capture.",
		PlansRequired: []string{"starter", "professional", "enterprise"},
		SupportsTrial: true,
	},
}

func (s *Server) getCatalog(w http.ResponseWriter, _ *http.Request) {
	writeJSON(w, http.StatusOK, map[string]any{"items": catalog})
}

type catalogRequestReq struct {
	TenantID string `json:"tenant_id"`
	Product  string `json:"product"`
}

// catalogRequest — customer requests a non-subscribed product. Today this
// just emits an audit event tagged so the eventual ERPNext-Lead step
// (M11.1) can pick it up.
func (s *Server) catalogRequest(w http.ResponseWriter, r *http.Request) {
	var in catalogRequestReq
	if !decodeJSON(w, r, &in) {
		return
	}
	if in.TenantID == "" || in.Product == "" {
		writeError(w, http.StatusBadRequest, "invalid_input", "tenant_id and product are required")
		return
	}
	if !isKnownProduct(in.Product) {
		writeError(w, http.StatusBadRequest, "unknown_product", "product is not in the catalog")
		return
	}

	ctx, cancel := context.WithTimeout(r.Context(), 5*time.Second)
	defer cancel()

	if _, err := s.Store.GetTenant(ctx, in.TenantID); err != nil {
		if mapStoreError(w, err) {
			return
		}
		writeError(w, http.StatusInternalServerError, "internal", err.Error())
		return
	}

	s.emitAudit(ctx, r, store.AuditEvent{
		TenantID: in.TenantID, Action: "catalog.requested",
		TargetID: in.Product, TargetType: "product",
		Metadata: map[string]interface{}{"product": in.Product},
	})

	writeJSON(w, http.StatusAccepted, map[string]string{
		"status":  "accepted",
		"message": "request recorded; sales will be in touch",
	})
}

// catalogTrialRequest — customer self-serves a 14-day trial of a product
// that supports trial. Provisions the entitlement immediately so the
// product can be used right away.
func (s *Server) catalogTrialRequest(w http.ResponseWriter, r *http.Request) {
	var in catalogRequestReq
	if !decodeJSON(w, r, &in) {
		return
	}
	if in.TenantID == "" || in.Product == "" {
		writeError(w, http.StatusBadRequest, "invalid_input", "tenant_id and product are required")
		return
	}
	entry, ok := lookupCatalogEntry(in.Product)
	if !ok {
		writeError(w, http.StatusBadRequest, "unknown_product", "product is not in the catalog")
		return
	}
	if !entry.SupportsTrial {
		writeError(w, http.StatusBadRequest, "trial_unavailable", "product does not support self-serve trial")
		return
	}

	ctx, cancel := context.WithTimeout(r.Context(), 5*time.Second)
	defer cancel()

	if _, err := s.Store.GetTenant(ctx, in.TenantID); err != nil {
		if mapStoreError(w, err) {
			return
		}
		writeError(w, http.StatusInternalServerError, "internal", err.Error())
		return
	}

	expiresAt := time.Now().UTC().Add(14 * 24 * time.Hour)
	tp, err := s.Store.UpsertTenantProduct(ctx, store.TenantProduct{
		TenantID: in.TenantID, Product: in.Product, Enabled: true,
		Config: map[string]interface{}{"source": "trial"}, ExpiresAt: &expiresAt,
	})
	if err != nil {
		if mapStoreError(w, err) {
			return
		}
		writeError(w, http.StatusInternalServerError, "internal", err.Error())
		return
	}

	s.emitAudit(ctx, r, store.AuditEvent{
		TenantID: in.TenantID, Action: "catalog.trial_started",
		TargetID: in.Product, TargetType: "product",
		Metadata: map[string]interface{}{"product": in.Product, "expires_at": expiresAt.Format(time.RFC3339)},
	})

	writeJSON(w, http.StatusCreated, tp)
}

func isKnownProduct(key string) bool {
	_, ok := lookupCatalogEntry(key)
	return ok
}

func lookupCatalogEntry(key string) (store.CatalogEntry, bool) {
	for _, e := range catalog {
		if e.Key == key {
			return e, true
		}
	}
	return store.CatalogEntry{}, false
}