package control

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

    "github.com/jan/fm-rds-tx/internal/config"
    drypkg "github.com/jan/fm-rds-tx/internal/dryrun"
)

type Server struct {
    mu  sync.RWMutex
    cfg config.Config
}

func NewServer(cfg config.Config) *Server { return &Server{cfg: cfg} }

func (s *Server) Handler() http.Handler {
    mux := http.NewServeMux()
    mux.HandleFunc("/healthz", s.handleHealth)
    mux.HandleFunc("/status", s.handleStatus)
    mux.HandleFunc("/dry-run", s.handleDryRun)
    return mux
}

func (s *Server) handleHealth(w http.ResponseWriter, _ *http.Request) {
    w.Header().Set("Content-Type", "application/json")
    _ = json.NewEncoder(w).Encode(map[string]any{"ok": true})
}

func (s *Server) handleStatus(w http.ResponseWriter, _ *http.Request) {
    s.mu.RLock()
    cfg := s.cfg
    s.mu.RUnlock()

    w.Header().Set("Content-Type", "application/json")
    _ = json.NewEncoder(w).Encode(map[string]any{
        "service": "fm-rds-tx",
        "backend": cfg.Backend.Kind,
        "frequencyMHz": cfg.FM.FrequencyMHz,
        "stereoEnabled": cfg.FM.StereoEnabled,
        "rdsEnabled": cfg.RDS.Enabled,
    })
}

func (s *Server) handleDryRun(w http.ResponseWriter, _ *http.Request) {
    s.mu.RLock()
    cfg := s.cfg
    s.mu.RUnlock()

    w.Header().Set("Content-Type", "application/json")
    _ = json.NewEncoder(w).Encode(drypkg.Generate(cfg))
}