package server

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

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

	"github.com/operator/command-center/internal/observability"
)

func (s *Server) handleHealth(w http.ResponseWriter, r *http.Request) {
	status := s.health.Check(r.Context())
	w.Header().Set("Content-Type", "application/json")
	w.Header().Set("Cache-Control", "no-store")
	// Any non-ok status still returns 200; the JSON body carries the verdict.
	// Operators using a simple HTTP probe should treat the response body's
	// "status" field as authoritative.
	w.WriteHeader(http.StatusOK)
	_ = json.NewEncoder(w).Encode(status)
}

func (s *Server) handleEvents(w http.ResponseWriter, r *http.Request) {
	level := r.URL.Query().Get("level")
	component := r.URL.Query().Get("component")
	limit := 100
	if v := r.URL.Query().Get("limit"); v != "" {
		if n, err := strconv.Atoi(v); err == nil {
			limit = n
		}
	}

	events, err := s.events.Query(r.Context(), level, component, limit)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	if events == nil {
		events = []observability.Event{}
	}

	w.Header().Set("Content-Type", "application/json")
	w.Header().Set("Cache-Control", "no-store")
	_ = json.NewEncoder(w).Encode(map[string]any{
		"count":  len(events),
		"events": events,
	})
}

// requestLogger is the structured access log middleware. It emits one
// info-level line per request with method, path, status, duration, and the
// request id assigned by chi.
func (s *Server) requestLogger(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		start := time.Now()
		ww := middleware.NewWrapResponseWriter(w, r.ProtoMajor)
		next.ServeHTTP(ww, r)
		s.logger.Info().
			Str("method", r.Method).
			Str("path", r.URL.Path).
			Int("status", ww.Status()).
			Int("bytes", ww.BytesWritten()).
			Dur("duration", time.Since(start)).
			Str("request_id", middleware.GetReqID(r.Context())).
			Str("remote", r.RemoteAddr).
			Msg("http_request")
	})
}