package router

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

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

	"github.com/jmoiron/sqlx"
)

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

	// Services
	caseSvc := services.NewCaseService(db)
	partySvc := services.NewPartyService(db)

	// Handlers
	caseH := handlers.NewCaseHandler(caseSvc)
	partyH := handlers.NewPartyHandler(partySvc)

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

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

	// Cases
	api.HandleFunc("GET /api/cases", caseH.List)
	api.HandleFunc("POST /api/cases", caseH.Create)
	api.HandleFunc("GET /api/cases/{id}", caseH.Get)
	api.HandleFunc("PUT /api/cases/{id}", caseH.Update)
	api.HandleFunc("DELETE /api/cases/{id}", caseH.Delete)

	// Parties (nested under cases for creation/listing, top-level for update/delete)
	api.HandleFunc("GET /api/cases/{id}/parties", partyH.List)
	api.HandleFunc("POST /api/cases/{id}/parties", partyH.Create)
	api.HandleFunc("PUT /api/parties/{partyId}", partyH.Update)
	api.HandleFunc("DELETE /api/parties/{partyId}", partyH.Delete)

	// Placeholder routes for future phases
	api.HandleFunc("GET /api/deadlines", placeholder("deadlines"))
	api.HandleFunc("GET /api/appointments", placeholder("appointments"))
	api.HandleFunc("GET /api/documents", placeholder("documents"))

	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,
		})
	}
}