/* Copyright (c) 2010-2018 Dovecot authors, see the included COPYING file */

#include "lib.h"
#include "array.h"
#include "ostream.h"
#include "doveadm-print-private.h"

struct doveadm_print_flow_header {
	const char *title;
	enum doveadm_print_header_flags flags;
};

struct doveadm_print_flow_context {
	pool_t pool;
	ARRAY(struct doveadm_print_flow_header) headers;
	unsigned int header_idx;

	bool streaming:1;
};

static struct doveadm_print_flow_context *ctx;

static void
doveadm_print_flow_header(const struct doveadm_print_header *hdr)
{
	struct doveadm_print_flow_header *fhdr;

	fhdr = array_append_space(&ctx->headers);
	fhdr->title = p_strdup(ctx->pool, hdr->title);
	fhdr->flags = hdr->flags;
}

static void flow_next_hdr(void)
{
	if (++ctx->header_idx < array_count(&ctx->headers))
		o_stream_nsend(doveadm_print_ostream, " ", 1);
	else {
		ctx->header_idx = 0;
		o_stream_nsend(doveadm_print_ostream, "\n", 1);
	}
}

static void doveadm_print_flow_print_header(const struct doveadm_print_flow_header *hdr)
{
	if ((hdr->flags & DOVEADM_PRINT_HEADER_FLAG_HIDE_TITLE) == 0) {
		o_stream_nsend_str(doveadm_print_ostream, hdr->title);
		o_stream_nsend(doveadm_print_ostream, "=", 1);
	}
}

static void doveadm_print_flow_print(const char *value)
{
	const struct doveadm_print_flow_header *hdr =
		array_idx(&ctx->headers, ctx->header_idx);

	doveadm_print_flow_print_header(hdr);
	o_stream_nsend_str(doveadm_print_ostream, value);
	flow_next_hdr();
}

static void
doveadm_print_flow_print_stream(const unsigned char *value, size_t size)
{
	const struct doveadm_print_flow_header *hdr =
		array_idx(&ctx->headers, ctx->header_idx);

	if (!ctx->streaming) {
		ctx->streaming = TRUE;
		doveadm_print_flow_print_header(hdr);
	}
	o_stream_nsend(doveadm_print_ostream, value, size);
	if (size == 0) {
		flow_next_hdr();
		ctx->streaming = FALSE;
	}
}

static void doveadm_print_flow_init(void)
{
	pool_t pool;

	pool = pool_alloconly_create("doveadm print flow", 1024);
	ctx = p_new(pool, struct doveadm_print_flow_context, 1);
	ctx->pool = pool;
	p_array_init(&ctx->headers, pool, 16);
}

static void doveadm_print_flow_flush(void)
{
	if (ctx->header_idx != 0) {
		o_stream_nsend(doveadm_print_ostream, "\n", 1);
		ctx->header_idx = 0;
	}
}

static void doveadm_print_flow_deinit(void)
{
	pool_unref(&ctx->pool);
	ctx = NULL;
}

struct doveadm_print_vfuncs doveadm_print_flow_vfuncs = {
	"flow",

	doveadm_print_flow_init,
	doveadm_print_flow_deinit,
	doveadm_print_flow_header,
	doveadm_print_flow_print,
	doveadm_print_flow_print_stream,
	doveadm_print_flow_flush
};