package commandcenter

import (
	"encoding/json"
	"errors"
	"net/http"
	"time"

	"github.com/go-chi/chi/v5"

	"github.com/missionworkforce/missionmatch/internal/platform/tenant"
)

// Handler serves the Workforce Command Center endpoint.
type Handler struct{ svc *Service }

func NewHandler(svc *Service) *Handler { return &Handler{svc: svc} }

// Routes mounts GET /command-center under the tenant-scoped group.
func (h *Handler) Routes(r chi.Router) {
	r.Get("/command-center", h.get)
}

func (h *Handler) get(w http.ResponseWriter, r *http.Request) {
	asOf := h.svc.clock()
	if q := r.URL.Query().Get("as_of"); q != "" {
		if t, err := time.Parse("2006-01-02", q); err == nil {
			asOf = t
		}
	}
	v, err := h.svc.CommandCenter(r.Context(), asOf)
	if err != nil {
		w.Header().Set("Content-Type", "application/json")
		switch {
		case errors.Is(err, tenant.ErrNoTenant):
			w.WriteHeader(http.StatusForbidden)
			_, _ = w.Write([]byte(`{"error":"no validated tenant"}`))
		case errors.Is(err, ErrNoDatabase):
			w.WriteHeader(http.StatusServiceUnavailable)
			_, _ = w.Write([]byte(`{"error":"database not configured"}`))
		default:
			w.WriteHeader(http.StatusInternalServerError)
			_, _ = w.Write([]byte(`{"error":"internal error"}`))
		}
		return
	}
	w.Header().Set("Content-Type", "application/json")
	_ = json.NewEncoder(w).Encode(v)
}