#include <linux/compiler.h>
#include <linux/kernel.h>
#include "util.h"
#include "debug.h"
#include "builtin.h"
#include <subcmd/parse-options.h>
#include "mem-events.h"
#include "session.h"
#include "hist.h"
#include "tool.h"
#include "data.h"
#include "sort.h"

struct c2c_hists {
	struct hists		hists;
	struct perf_hpp_list	list;
};

struct c2c_hist_entry {
	struct c2c_hists	*hists;
	/*
	 * must be at the end,
	 * because of its callchain dynamic entry
	 */
	struct hist_entry	he;
};

struct perf_c2c {
	struct perf_tool	tool;
	struct c2c_hists	hists;
};

static struct perf_c2c c2c;

static void *c2c_he_zalloc(size_t size)
{
	struct c2c_hist_entry *c2c_he;

	c2c_he = zalloc(size + sizeof(*c2c_he));
	if (!c2c_he)
		return NULL;

	return &c2c_he->he;
}

static void c2c_he_free(void *he)
{
	struct c2c_hist_entry *c2c_he;

	c2c_he = container_of(he, struct c2c_hist_entry, he);
	if (c2c_he->hists) {
		hists__delete_entries(&c2c_he->hists->hists);
		free(c2c_he->hists);
	}

	free(c2c_he);
}

static struct hist_entry_ops c2c_entry_ops = {
	.new	= c2c_he_zalloc,
	.free	= c2c_he_free,
};

static int process_sample_event(struct perf_tool *tool __maybe_unused,
				union perf_event *event,
				struct perf_sample *sample,
				struct perf_evsel *evsel __maybe_unused,
				struct machine *machine)
{
	struct hists *hists = &c2c.hists.hists;
	struct hist_entry *he;
	struct addr_location al;
	struct mem_info *mi;
	int ret;

	if (machine__resolve(machine, &al, sample) < 0) {
		pr_debug("problem processing %d event, skipping it.\n",
			 event->header.type);
		return -1;
	}

	mi = sample__resolve_mem(sample, &al);
	if (mi == NULL)
		return -ENOMEM;

	he = hists__add_entry_ops(hists, &c2c_entry_ops,
				  &al, NULL, NULL, mi,
				  sample, true);
	if (he == NULL) {
		free(mi);
		return -ENOMEM;
	}

	hists__inc_nr_samples(hists, he->filtered);
	ret = hist_entry__append_callchain(he, sample);

	addr_location__put(&al);
	return ret;
}

static struct perf_c2c c2c = {
	.tool = {
		.sample		= process_sample_event,
		.mmap		= perf_event__process_mmap,
		.mmap2		= perf_event__process_mmap2,
		.comm		= perf_event__process_comm,
		.exit		= perf_event__process_exit,
		.fork		= perf_event__process_fork,
		.lost		= perf_event__process_lost,
		.ordered_events	= true,
		.ordering_requires_timestamps = true,
	},
};

static const char * const c2c_usage[] = {
	"perf c2c {record|report}",
	NULL
};

static const char * const __usage_report[] = {
	"perf c2c report",
	NULL
};

static const char * const *report_c2c_usage = __usage_report;

#define C2C_HEADER_MAX 2

struct c2c_header {
	struct {
		const char *text;
		int	    span;
	} line[C2C_HEADER_MAX];
};

struct c2c_dimension {
	struct c2c_header	 header;
	const char		*name;
	int			 width;
	struct sort_entry	*se;

	int64_t (*cmp)(struct perf_hpp_fmt *fmt,
		       struct hist_entry *, struct hist_entry *);
	int   (*entry)(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
		       struct hist_entry *he);
	int   (*color)(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
		       struct hist_entry *he);
};

struct c2c_fmt {
	struct perf_hpp_fmt	 fmt;
	struct c2c_dimension	*dim;
};

static int c2c_width(struct perf_hpp_fmt *fmt,
		     struct perf_hpp *hpp __maybe_unused,
		     struct hists *hists __maybe_unused)
{
	struct c2c_fmt *c2c_fmt;
	struct c2c_dimension *dim;

	c2c_fmt = container_of(fmt, struct c2c_fmt, fmt);
	dim = c2c_fmt->dim;

	return dim->se ? hists__col_len(hists, dim->se->se_width_idx) :
			 c2c_fmt->dim->width;
}

static int c2c_header(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
		      struct hists *hists, int line, int *span)
{
	struct perf_hpp_list *hpp_list = hists->hpp_list;
	struct c2c_fmt *c2c_fmt;
	struct c2c_dimension *dim;
	const char *text = NULL;
	int width = c2c_width(fmt, hpp, hists);

	c2c_fmt = container_of(fmt, struct c2c_fmt, fmt);
	dim = c2c_fmt->dim;

	if (dim->se) {
		text = dim->header.line[line].text;
		/* Use the last line from sort_entry if not defined. */
		if (!text && (line == hpp_list->nr_header_lines - 1))
			text = dim->se->se_header;
	} else {
		text = dim->header.line[line].text;

		if (*span) {
			(*span)--;
			return 0;
		} else {
			*span = dim->header.line[line].span;
		}
	}

	if (text == NULL)
		text = "";

	return scnprintf(hpp->buf, hpp->size, "%*s", width, text);
}

static struct c2c_dimension *dimensions[] = {
	NULL,
};

static void fmt_free(struct perf_hpp_fmt *fmt)
{
	struct c2c_fmt *c2c_fmt;

	c2c_fmt = container_of(fmt, struct c2c_fmt, fmt);
	free(c2c_fmt);
}

static bool fmt_equal(struct perf_hpp_fmt *a, struct perf_hpp_fmt *b)
{
	struct c2c_fmt *c2c_a = container_of(a, struct c2c_fmt, fmt);
	struct c2c_fmt *c2c_b = container_of(b, struct c2c_fmt, fmt);

	return c2c_a->dim == c2c_b->dim;
}

static struct c2c_dimension *get_dimension(const char *name)
{
	unsigned int i;

	for (i = 0; dimensions[i]; i++) {
		struct c2c_dimension *dim = dimensions[i];

		if (!strcmp(dim->name, name))
			return dim;
	};

	return NULL;
}

static int c2c_se_entry(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
			struct hist_entry *he)
{
	struct c2c_fmt *c2c_fmt = container_of(fmt, struct c2c_fmt, fmt);
	struct c2c_dimension *dim = c2c_fmt->dim;
	size_t len = fmt->user_len;

	if (!len)
		len = hists__col_len(he->hists, dim->se->se_width_idx);

	return dim->se->se_snprintf(he, hpp->buf, hpp->size, len);
}

static int64_t c2c_se_cmp(struct perf_hpp_fmt *fmt,
			  struct hist_entry *a, struct hist_entry *b)
{
	struct c2c_fmt *c2c_fmt = container_of(fmt, struct c2c_fmt, fmt);
	struct c2c_dimension *dim = c2c_fmt->dim;

	return dim->se->se_cmp(a, b);
}

static int64_t c2c_se_collapse(struct perf_hpp_fmt *fmt,
			       struct hist_entry *a, struct hist_entry *b)
{
	struct c2c_fmt *c2c_fmt = container_of(fmt, struct c2c_fmt, fmt);
	struct c2c_dimension *dim = c2c_fmt->dim;
	int64_t (*collapse_fn)(struct hist_entry *, struct hist_entry *);

	collapse_fn = dim->se->se_collapse ?: dim->se->se_cmp;
	return collapse_fn(a, b);
}

static struct c2c_fmt *get_format(const char *name)
{
	struct c2c_dimension *dim = get_dimension(name);
	struct c2c_fmt *c2c_fmt;
	struct perf_hpp_fmt *fmt;

	if (!dim)
		return NULL;

	c2c_fmt = zalloc(sizeof(*c2c_fmt));
	if (!c2c_fmt)
		return NULL;

	c2c_fmt->dim = dim;

	fmt = &c2c_fmt->fmt;
	INIT_LIST_HEAD(&fmt->list);
	INIT_LIST_HEAD(&fmt->sort_list);

	fmt->cmp	= dim->se ? c2c_se_cmp   : dim->cmp;
	fmt->sort	= dim->se ? c2c_se_cmp   : dim->cmp;
	fmt->entry	= dim->se ? c2c_se_entry : dim->entry;
	fmt->header	= c2c_header;
	fmt->width	= c2c_width;
	fmt->collapse	= dim->se ? c2c_se_collapse : dim->cmp;
	fmt->equal	= fmt_equal;
	fmt->free	= fmt_free;

	return c2c_fmt;
}

static int c2c_hists__init_output(struct perf_hpp_list *hpp_list, char *name)
{
	struct c2c_fmt *c2c_fmt = get_format(name);

	if (!c2c_fmt) {
		reset_dimensions();
		return output_field_add(hpp_list, name);
	}

	perf_hpp_list__column_register(hpp_list, &c2c_fmt->fmt);
	return 0;
}

static int c2c_hists__init_sort(struct perf_hpp_list *hpp_list, char *name)
{
	struct c2c_fmt *c2c_fmt = get_format(name);

	if (!c2c_fmt) {
		reset_dimensions();
		return sort_dimension__add(hpp_list, name, NULL, 0);
	}

	perf_hpp_list__register_sort_field(hpp_list, &c2c_fmt->fmt);
	return 0;
}

#define PARSE_LIST(_list, _fn)							\
	do {									\
		char *tmp, *tok;						\
		ret = 0;							\
										\
		if (!_list)							\
			break;							\
										\
		for (tok = strtok_r((char *)_list, ", ", &tmp);			\
				tok; tok = strtok_r(NULL, ", ", &tmp)) {	\
			ret = _fn(hpp_list, tok);				\
			if (ret == -EINVAL) {					\
				error("Invalid --fields key: `%s'", tok);	\
				break;						\
			} else if (ret == -ESRCH) {				\
				error("Unknown --fields key: `%s'", tok);	\
				break;						\
			}							\
		}								\
	} while (0)

static int hpp_list__parse(struct perf_hpp_list *hpp_list,
			   const char *output_,
			   const char *sort_)
{
	char *output = output_ ? strdup(output_) : NULL;
	char *sort   = sort_   ? strdup(sort_) : NULL;
	int ret;

	PARSE_LIST(output, c2c_hists__init_output);
	PARSE_LIST(sort,   c2c_hists__init_sort);

	/* copy sort keys to output fields */
	perf_hpp__setup_output_field(hpp_list);

	/*
	 * We dont need other sorting keys other than those
	 * we already specified. It also really slows down
	 * the processing a lot with big number of output
	 * fields, so switching this off for c2c.
	 */

#if 0
	/* and then copy output fields to sort keys */
	perf_hpp__append_sort_keys(&hists->list);
#endif

	free(output);
	free(sort);
	return ret;
}

static int c2c_hists__init(struct c2c_hists *hists,
			   const char *sort)
{
	__hists__init(&hists->hists, &hists->list);

	/*
	 * Initialize only with sort fields, we need to resort
	 * later anyway, and that's where we add output fields
	 * as well.
	 */
	perf_hpp_list__init(&hists->list);

	return hpp_list__parse(&hists->list, NULL, sort);
}

__maybe_unused
static int c2c_hists__reinit(struct c2c_hists *c2c_hists,
			     const char *output,
			     const char *sort)
{
	perf_hpp__reset_output_field(&c2c_hists->list);
	return hpp_list__parse(&c2c_hists->list, output, sort);
}

static int perf_c2c__report(int argc, const char **argv)
{
	struct perf_session *session;
	struct ui_progress prog;
	struct perf_data_file file = {
		.mode = PERF_DATA_MODE_READ,
	};
	const struct option c2c_options[] = {
	OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
		   "file", "vmlinux pathname"),
	OPT_INCR('v', "verbose", &verbose,
		 "be more verbose (show counter open errors, etc)"),
	OPT_STRING('i', "input", &input_name, "file",
		   "the input file to process"),
	OPT_END()
	};
	int err = 0;

	argc = parse_options(argc, argv, c2c_options, report_c2c_usage,
			     PARSE_OPT_STOP_AT_NON_OPTION);
	if (argc)
		usage_with_options(report_c2c_usage, c2c_options);

	if (!input_name || !strlen(input_name))
		input_name = "perf.data";

	file.path = input_name;

	err = c2c_hists__init(&c2c.hists, "dcacheline");
	if (err) {
		pr_debug("Failed to initialize hists\n");
		goto out;
	}

	session = perf_session__new(&file, 0, &c2c.tool);
	if (session == NULL) {
		pr_debug("No memory for session\n");
		goto out;
	}

	if (symbol__init(&session->header.env) < 0)
		goto out_session;

	/* No pipe support at the moment. */
	if (perf_data_file__is_pipe(session->file)) {
		pr_debug("No pipe support at the moment.\n");
		goto out_session;
	}

	err = perf_session__process_events(session);
	if (err) {
		pr_err("failed to process sample\n");
		goto out_session;
	}

	ui_progress__init(&prog, c2c.hists.hists.nr_entries, "Sorting...");

	hists__collapse_resort(&c2c.hists.hists, NULL);
	hists__output_resort(&c2c.hists.hists, &prog);

	ui_progress__finish();

out_session:
	perf_session__delete(session);
out:
	return err;
}

static int parse_record_events(const struct option *opt __maybe_unused,
			       const char *str, int unset __maybe_unused)
{
	bool *event_set = (bool *) opt->value;

	*event_set = true;
	return perf_mem_events__parse(str);
}


static const char * const __usage_record[] = {
	"perf c2c record [<options>] [<command>]",
	"perf c2c record [<options>] -- <command> [<options>]",
	NULL
};

static const char * const *record_mem_usage = __usage_record;

static int perf_c2c__record(int argc, const char **argv)
{
	int rec_argc, i = 0, j;
	const char **rec_argv;
	int ret;
	bool all_user = false, all_kernel = false;
	bool event_set = false;
	struct option options[] = {
	OPT_CALLBACK('e', "event", &event_set, "event",
		     "event selector. Use 'perf mem record -e list' to list available events",
		     parse_record_events),
	OPT_INCR('v', "verbose", &verbose,
		 "be more verbose (show counter open errors, etc)"),
	OPT_BOOLEAN('u', "all-user", &all_user, "collect only user level data"),
	OPT_BOOLEAN('k', "all-kernel", &all_kernel, "collect only kernel level data"),
	OPT_UINTEGER('l', "ldlat", &perf_mem_events__loads_ldlat, "setup mem-loads latency"),
	OPT_END()
	};

	if (perf_mem_events__init()) {
		pr_err("failed: memory events not supported\n");
		return -1;
	}

	argc = parse_options(argc, argv, options, record_mem_usage,
			     PARSE_OPT_KEEP_UNKNOWN);

	rec_argc = argc + 10; /* max number of arguments */
	rec_argv = calloc(rec_argc + 1, sizeof(char *));
	if (!rec_argv)
		return -1;

	rec_argv[i++] = "record";

	if (!event_set) {
		perf_mem_events[PERF_MEM_EVENTS__LOAD].record  = true;
		perf_mem_events[PERF_MEM_EVENTS__STORE].record = true;
	}

	if (perf_mem_events[PERF_MEM_EVENTS__LOAD].record)
		rec_argv[i++] = "-W";

	rec_argv[i++] = "-d";
	rec_argv[i++] = "--sample-cpu";

	for (j = 0; j < PERF_MEM_EVENTS__MAX; j++) {
		if (!perf_mem_events[j].record)
			continue;

		if (!perf_mem_events[j].supported) {
			pr_err("failed: event '%s' not supported\n",
			       perf_mem_events[j].name);
			return -1;
		}

		rec_argv[i++] = "-e";
		rec_argv[i++] = perf_mem_events__name(j);
	};

	if (all_user)
		rec_argv[i++] = "--all-user";

	if (all_kernel)
		rec_argv[i++] = "--all-kernel";

	for (j = 0; j < argc; j++, i++)
		rec_argv[i] = argv[j];

	if (verbose > 0) {
		pr_debug("calling: ");

		j = 0;

		while (rec_argv[j]) {
			pr_debug("%s ", rec_argv[j]);
			j++;
		}
		pr_debug("\n");
	}

	ret = cmd_record(i, rec_argv, NULL);
	free(rec_argv);
	return ret;
}

int cmd_c2c(int argc, const char **argv, const char *prefix __maybe_unused)
{
	const struct option c2c_options[] = {
	OPT_INCR('v', "verbose", &verbose, "be more verbose"),
	OPT_END()
	};

	argc = parse_options(argc, argv, c2c_options, c2c_usage,
			     PARSE_OPT_STOP_AT_NON_OPTION);

	if (!argc)
		usage_with_options(c2c_usage, c2c_options);

	if (!strncmp(argv[0], "rec", 3)) {
		return perf_c2c__record(argc, argv);
	} else if (!strncmp(argv[0], "rep", 3)) {
		return perf_c2c__report(argc, argv);
	} else {
		usage_with_options(c2c_usage, c2c_options);
	}

	return 0;
}