/*
 * scan.c - Phase 1 inventory demo: scan UPC barcodes and display them.
 *
 * Blocking design: the app opens the barcode serial channel (TTY:D) and reads
 * it with a blocking p_read, assembling bytes until the scanner's terminator,
 * then validates and prints each barcode. Exit via the System screen.
 *
 * (An earlier version waited on the keyboard asynchronously via CON: so Esc
 * could quit; that panicked the Window Server - on SIBO the keyboard is
 * event-driven through the window server, not a raw CON: byte read. A proper
 * scan-or-key loop needs the Window Server event API, whose reference manual
 * is not among the SDK docs in this repo. Blocking output via p_printf is
 * fine, so this version sticks to that.)
 *
 * This also serves as the format diagnostic: it prints the byte length of each
 * decoded barcode alongside the text, so we can see exactly what the scanner
 * emits for a UPC (12 vs 13 digits, any prefix/suffix) before Phase 2 uses it
 * as a database key.
 */
#include <plib.h>
#include "bcode.h"
#include "upc.h"

GLDEF_C INT main(VOID)
{
    VOID *bchan;
    UBYTE raw[BCODE_MAXLEN];
    TEXT  line[BCODE_MAXLEN];
    INT   lineLen = 0;
    INT   err, n, textLen;

    if ((err = bcodeOpen(&bchan)) < 0) {
        p_printf("Cannot open barcode port TTY:D (err %d)\n", err);
        return 1;
    }

    p_printf("Inventory scan demo\n");
    p_printf("Scan UPC barcodes. Exit via the System screen.\n\n");

    for (;;) {
        n = p_read(bchan, raw, sizeof(raw));   /* blocks until bytes arrive */
        if (n < 0) {
            p_printf("read error %d\n", n);
            continue;
        }
        if (bcodeAssemble(raw, n, line, &lineLen, BCODE_MAXLEN)) {
            textLen = 0;
            while (line[textLen] != '\0')
                textLen++;
            /* Diagnostic: length + text + validity. */
            if (upcIsValid(line))
                p_printf("len=%d [%s] OK\n", textLen, line);
            else
                p_printf("len=%d [%s] BAD\n", textLen, line);
        }
    }
    /* not reached in this diagnostic build */
}