package router

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

	"github.com/jmoiron/sqlx"

	"mgit.msbls.de/m/KanzlAI-mGMT/internal/auth"
	"mgit.msbls.de/m/KanzlAI-mGMT/internal/handlers"
	"mgit.msbls.de/m/KanzlAI-mGMT/internal/services"
)

func New(db *sqlx.DB, authMW *auth.Middleware) http.Handler {
	mux := http.NewServeMux()

	// Services
	tenantSvc := services.NewTenantService(db)

	// Middleware
	tenantResolver := auth.NewTenantResolver(tenantSvc)

	// Handlers
	tenantH := handlers.NewTenantHandler(tenantSvc)

	// Public routes
	mux.HandleFunc("GET /health", handleHealth(db))

	// Authenticated API routes
	api := http.NewServeMux()

	// Tenant management (no tenant resolver — these operate across tenants)
	api.HandleFunc("POST /api/tenants", tenantH.CreateTenant)
	api.HandleFunc("GET /api/tenants", tenantH.ListTenants)
	api.HandleFunc("GET /api/tenants/{id}", tenantH.GetTenant)
	api.HandleFunc("POST /api/tenants/{id}/invite", tenantH.InviteUser)
	api.HandleFunc("DELETE /api/tenants/{id}/members/{uid}", tenantH.RemoveMember)
	api.HandleFunc("GET /api/tenants/{id}/members", tenantH.ListMembers)

	// Tenant-scoped routes (require tenant context)
	scoped := http.NewServeMux()
	scoped.HandleFunc("GET /api/cases", placeholder("cases"))
	scoped.HandleFunc("GET /api/deadlines", placeholder("deadlines"))
	scoped.HandleFunc("GET /api/appointments", placeholder("appointments"))
	scoped.HandleFunc("GET /api/documents", placeholder("documents"))

	// Wire: auth -> tenant routes go directly, scoped routes get tenant resolver
	api.Handle("/api/", tenantResolver.Resolve(scoped))

	mux.Handle("/api/", authMW.RequireAuth(api))

	return mux
}

func handleHealth(db *sqlx.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		if err := db.Ping(); err != nil {
			w.WriteHeader(http.StatusServiceUnavailable)
			json.NewEncoder(w).Encode(map[string]string{"status": "error", "error": err.Error()})
			return
		}
		w.Header().Set("Content-Type", "application/json")
		json.NewEncoder(w).Encode(map[string]string{"status": "ok"})
	}
}

func placeholder(resource string) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		json.NewEncoder(w).Encode(map[string]string{
			"status":   "not_implemented",
			"resource": resource,
		})
	}
}