package main

import (
    "flag"
    "fmt"
    "log"
    "net/http"
    "os"

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

func main() {
    configPath := flag.String("config", "", "path to JSON config")
    printConfig := flag.Bool("print-config", false, "print effective config and exit")
    dryRun := flag.Bool("dry-run", false, "run no-hardware dry-run output")
    dryOutput := flag.String("dry-output", "-", "dry-run output path or - for stdout")
    flag.Parse()

    cfg, err := cfgpkg.Load(*configPath)
    if err != nil {
        log.Fatalf("load config: %v", err)
    }

    if *printConfig {
        fmt.Printf("backend=%s freq=%.1fMHz stereo=%t rds=%t listen=%s\n", cfg.Backend.Kind, cfg.FM.FrequencyMHz, cfg.FM.StereoEnabled, cfg.RDS.Enabled, cfg.Control.ListenAddress)
        return
    }

    if *dryRun {
        frame := drypkg.Generate(cfg)
        if err := drypkg.WriteJSON(*dryOutput, frame); err != nil {
            log.Fatalf("dry-run failed: %v", err)
        }
        if *dryOutput != "" && *dryOutput != "-" {
            fmt.Fprintf(os.Stderr, "dry run frame written to %s\n", *dryOutput)
        }
        return
    }

    srv := ctrlpkg.NewServer(cfg)
    log.Printf("fm-rds-tx listening on %s", cfg.Control.ListenAddress)
    log.Fatal(http.ListenAndServe(cfg.Control.ListenAddress, srv.Handler()))
}