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 {
	// Services
	holidaySvc := services.NewHolidayService(db)
	deadlineSvc := services.NewDeadlineService(db)
	deadlineRuleSvc := services.NewDeadlineRuleService(db)
	calculator := services.NewDeadlineCalculator(holidaySvc)

	// Handlers
	deadlineH := handlers.NewDeadlineHandlers(deadlineSvc, db)
	ruleH := handlers.NewDeadlineRuleHandlers(deadlineRuleSvc)
	calcH := handlers.NewCalculateHandlers(calculator, deadlineRuleSvc)

	mux := http.NewServeMux()

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

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

	// Deadline CRUD (case-scoped)
	api.HandleFunc("GET /api/cases/{caseID}/deadlines", deadlineH.ListForCase)
	api.HandleFunc("POST /api/cases/{caseID}/deadlines", deadlineH.Create)
	api.HandleFunc("PUT /api/deadlines/{deadlineID}", deadlineH.Update)
	api.HandleFunc("PATCH /api/deadlines/{deadlineID}/complete", deadlineH.Complete)
	api.HandleFunc("DELETE /api/deadlines/{deadlineID}", deadlineH.Delete)

	// Deadline rules (public reference data, but behind auth)
	api.HandleFunc("GET /api/deadline-rules", ruleH.List)
	api.HandleFunc("GET /api/deadline-rules/{type}", ruleH.GetRuleTree)

	// Deadline calculator
	api.HandleFunc("POST /api/deadlines/calculate", calcH.Calculate)

	// Placeholder routes (not yet implemented)
	api.HandleFunc("GET /api/cases", placeholder("cases"))
	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,
		})
	}
}