#include <stdio.h>
#include <math.h>

#include "../../util/util.h"
#include "../../util/hist.h"
#include "../../util/sort.h"


static size_t callchain__fprintf_left_margin(FILE *fp, int left_margin)
{
	int i;
	int ret = fprintf(fp, "            ");

	for (i = 0; i < left_margin; i++)
		ret += fprintf(fp, " ");

	return ret;
}

static size_t ipchain__fprintf_graph_line(FILE *fp, int depth, int depth_mask,
					  int left_margin)
{
	int i;
	size_t ret = callchain__fprintf_left_margin(fp, left_margin);

	for (i = 0; i < depth; i++)
		if (depth_mask & (1 << i))
			ret += fprintf(fp, "|          ");
		else
			ret += fprintf(fp, "           ");

	ret += fprintf(fp, "\n");

	return ret;
}

static size_t ipchain__fprintf_graph(FILE *fp, struct callchain_list *chain,
				     int depth, int depth_mask, int period,
				     u64 total_samples, u64 hits,
				     int left_margin)
{
	int i;
	size_t ret = 0;

	ret += callchain__fprintf_left_margin(fp, left_margin);
	for (i = 0; i < depth; i++) {
		if (depth_mask & (1 << i))
			ret += fprintf(fp, "|");
		else
			ret += fprintf(fp, " ");
		if (!period && i == depth - 1) {
			double percent;

			percent = hits * 100.0 / total_samples;
			ret += percent_color_fprintf(fp, "--%2.2f%%-- ", percent);
		} else
			ret += fprintf(fp, "%s", "          ");
	}
	if (chain->ms.sym)
		ret += fprintf(fp, "%s\n", chain->ms.sym->name);
	else
		ret += fprintf(fp, "0x%0" PRIx64 "\n", chain->ip);

	return ret;
}

static struct symbol *rem_sq_bracket;
static struct callchain_list rem_hits;

static void init_rem_hits(void)
{
	rem_sq_bracket = malloc(sizeof(*rem_sq_bracket) + 6);
	if (!rem_sq_bracket) {
		fprintf(stderr, "Not enough memory to display remaining hits\n");
		return;
	}

	strcpy(rem_sq_bracket->name, "[...]");
	rem_hits.ms.sym = rem_sq_bracket;
}

static size_t __callchain__fprintf_graph(FILE *fp, struct rb_root *root,
					 u64 total_samples, int depth,
					 int depth_mask, int left_margin)
{
	struct rb_node *node, *next;
	struct callchain_node *child;
	struct callchain_list *chain;
	int new_depth_mask = depth_mask;
	u64 remaining;
	size_t ret = 0;
	int i;
	uint entries_printed = 0;

	remaining = total_samples;

	node = rb_first(root);
	while (node) {
		u64 new_total;
		u64 cumul;

		child = rb_entry(node, struct callchain_node, rb_node);
		cumul = callchain_cumul_hits(child);
		remaining -= cumul;

		/*
		 * The depth mask manages the output of pipes that show
		 * the depth. We don't want to keep the pipes of the current
		 * level for the last child of this depth.
		 * Except if we have remaining filtered hits. They will
		 * supersede the last child
		 */
		next = rb_next(node);
		if (!next && (callchain_param.mode != CHAIN_GRAPH_REL || !remaining))
			new_depth_mask &= ~(1 << (depth - 1));

		/*
		 * But we keep the older depth mask for the line separator
		 * to keep the level link until we reach the last child
		 */
		ret += ipchain__fprintf_graph_line(fp, depth, depth_mask,
						   left_margin);
		i = 0;
		list_for_each_entry(chain, &child->val, list) {
			ret += ipchain__fprintf_graph(fp, chain, depth,
						      new_depth_mask, i++,
						      total_samples,
						      cumul,
						      left_margin);
		}

		if (callchain_param.mode == CHAIN_GRAPH_REL)
			new_total = child->children_hit;
		else
			new_total = total_samples;

		ret += __callchain__fprintf_graph(fp, &child->rb_root, new_total,
						  depth + 1,
						  new_depth_mask | (1 << depth),
						  left_margin);
		node = next;
		if (++entries_printed == callchain_param.print_limit)
			break;
	}

	if (callchain_param.mode == CHAIN_GRAPH_REL &&
		remaining && remaining != total_samples) {

		if (!rem_sq_bracket)
			return ret;

		new_depth_mask &= ~(1 << (depth - 1));
		ret += ipchain__fprintf_graph(fp, &rem_hits, depth,
					      new_depth_mask, 0, total_samples,
					      remaining, left_margin);
	}

	return ret;
}

static size_t callchain__fprintf_graph(FILE *fp, struct rb_root *root,
				       u64 total_samples, int left_margin)
{
	struct callchain_node *cnode;
	struct callchain_list *chain;
	u32 entries_printed = 0;
	bool printed = false;
	struct rb_node *node;
	int i = 0;
	int ret = 0;

	/*
	 * If have one single callchain root, don't bother printing
	 * its percentage (100 % in fractal mode and the same percentage
	 * than the hist in graph mode). This also avoid one level of column.
	 */
	node = rb_first(root);
	if (node && !rb_next(node)) {
		cnode = rb_entry(node, struct callchain_node, rb_node);
		list_for_each_entry(chain, &cnode->val, list) {
			/*
			 * If we sort by symbol, the first entry is the same than
			 * the symbol. No need to print it otherwise it appears as
			 * displayed twice.
			 */
			if (!i++ && sort__first_dimension == SORT_SYM)
				continue;
			if (!printed) {
				ret += callchain__fprintf_left_margin(fp, left_margin);
				ret += fprintf(fp, "|\n");
				ret += callchain__fprintf_left_margin(fp, left_margin);
				ret += fprintf(fp, "---");
				left_margin += 3;
				printed = true;
			} else
				ret += callchain__fprintf_left_margin(fp, left_margin);

			if (chain->ms.sym)
				ret += fprintf(fp, " %s\n", chain->ms.sym->name);
			else
				ret += fprintf(fp, " %p\n", (void *)(long)chain->ip);

			if (++entries_printed == callchain_param.print_limit)
				break;
		}
		root = &cnode->rb_root;
	}

	ret += __callchain__fprintf_graph(fp, root, total_samples,
					  1, 1, left_margin);
	ret += fprintf(fp, "\n");

	return ret;
}

static size_t __callchain__fprintf_flat(FILE *fp,
					struct callchain_node *self,
					u64 total_samples)
{
	struct callchain_list *chain;
	size_t ret = 0;

	if (!self)
		return 0;

	ret += __callchain__fprintf_flat(fp, self->parent, total_samples);


	list_for_each_entry(chain, &self->val, list) {
		if (chain->ip >= PERF_CONTEXT_MAX)
			continue;
		if (chain->ms.sym)
			ret += fprintf(fp, "                %s\n", chain->ms.sym->name);
		else
			ret += fprintf(fp, "                %p\n",
					(void *)(long)chain->ip);
	}

	return ret;
}

static size_t callchain__fprintf_flat(FILE *fp, struct rb_root *self,
				      u64 total_samples)
{
	size_t ret = 0;
	u32 entries_printed = 0;
	struct rb_node *rb_node;
	struct callchain_node *chain;

	rb_node = rb_first(self);
	while (rb_node) {
		double percent;

		chain = rb_entry(rb_node, struct callchain_node, rb_node);
		percent = chain->hit * 100.0 / total_samples;

		ret = percent_color_fprintf(fp, "           %6.2f%%\n", percent);
		ret += __callchain__fprintf_flat(fp, chain, total_samples);
		ret += fprintf(fp, "\n");
		if (++entries_printed == callchain_param.print_limit)
			break;

		rb_node = rb_next(rb_node);
	}

	return ret;
}

static size_t hist_entry_callchain__fprintf(struct hist_entry *he,
					    u64 total_samples, int left_margin,
					    FILE *fp)
{
	switch (callchain_param.mode) {
	case CHAIN_GRAPH_REL:
		return callchain__fprintf_graph(fp, &he->sorted_chain, he->period,
						left_margin);
		break;
	case CHAIN_GRAPH_ABS:
		return callchain__fprintf_graph(fp, &he->sorted_chain, total_samples,
						left_margin);
		break;
	case CHAIN_FLAT:
		return callchain__fprintf_flat(fp, &he->sorted_chain, total_samples);
		break;
	case CHAIN_NONE:
		break;
	default:
		pr_err("Bad callchain mode\n");
	}

	return 0;
}

static int hist_entry__pcnt_snprintf(struct hist_entry *he, char *s,
				     size_t size, struct hists *pair_hists,
				     bool show_displacement, long displacement,
				     bool color, u64 total_period)
{
	u64 period, total, period_sys, period_us, period_guest_sys, period_guest_us;
	u64 nr_events;
	const char *sep = symbol_conf.field_sep;
	int ret;

	if (symbol_conf.exclude_other && !he->parent)
		return 0;

	if (pair_hists) {
		period = he->pair ? he->pair->period : 0;
		nr_events = he->pair ? he->pair->nr_events : 0;
		total = pair_hists->stats.total_period;
		period_sys = he->pair ? he->pair->period_sys : 0;
		period_us = he->pair ? he->pair->period_us : 0;
		period_guest_sys = he->pair ? he->pair->period_guest_sys : 0;
		period_guest_us = he->pair ? he->pair->period_guest_us : 0;
	} else {
		period = he->period;
		nr_events = he->nr_events;
		total = total_period;
		period_sys = he->period_sys;
		period_us = he->period_us;
		period_guest_sys = he->period_guest_sys;
		period_guest_us = he->period_guest_us;
	}

	if (total) {
		if (color)
			ret = percent_color_snprintf(s, size,
						     sep ? "%.2f" : "   %6.2f%%",
						     (period * 100.0) / total);
		else
			ret = scnprintf(s, size, sep ? "%.2f" : "   %6.2f%%",
				       (period * 100.0) / total);
		if (symbol_conf.show_cpu_utilization) {
			ret += percent_color_snprintf(s + ret, size - ret,
					sep ? "%.2f" : "   %6.2f%%",
					(period_sys * 100.0) / total);
			ret += percent_color_snprintf(s + ret, size - ret,
					sep ? "%.2f" : "   %6.2f%%",
					(period_us * 100.0) / total);
			if (perf_guest) {
				ret += percent_color_snprintf(s + ret,
						size - ret,
						sep ? "%.2f" : "   %6.2f%%",
						(period_guest_sys * 100.0) /
								total);
				ret += percent_color_snprintf(s + ret,
						size - ret,
						sep ? "%.2f" : "   %6.2f%%",
						(period_guest_us * 100.0) /
								total);
			}
		}
	} else
		ret = scnprintf(s, size, sep ? "%" PRIu64 : "%12" PRIu64 " ", period);

	if (symbol_conf.show_nr_samples) {
		if (sep)
			ret += scnprintf(s + ret, size - ret, "%c%" PRIu64, *sep, nr_events);
		else
			ret += scnprintf(s + ret, size - ret, "%11" PRIu64, nr_events);
	}

	if (symbol_conf.show_total_period) {
		if (sep)
			ret += scnprintf(s + ret, size - ret, "%c%" PRIu64, *sep, period);
		else
			ret += scnprintf(s + ret, size - ret, " %12" PRIu64, period);
	}

	if (pair_hists) {
		char bf[32];
		double old_percent = 0, new_percent = 0, diff;

		if (total > 0)
			old_percent = (period * 100.0) / total;
		if (total_period > 0)
			new_percent = (he->period * 100.0) / total_period;

		diff = new_percent - old_percent;

		if (fabs(diff) >= 0.01)
			scnprintf(bf, sizeof(bf), "%+4.2F%%", diff);
		else
			scnprintf(bf, sizeof(bf), " ");

		if (sep)
			ret += scnprintf(s + ret, size - ret, "%c%s", *sep, bf);
		else
			ret += scnprintf(s + ret, size - ret, "%11.11s", bf);

		if (show_displacement) {
			if (displacement)
				scnprintf(bf, sizeof(bf), "%+4ld", displacement);
			else
				scnprintf(bf, sizeof(bf), " ");

			if (sep)
				ret += scnprintf(s + ret, size - ret, "%c%s", *sep, bf);
			else
				ret += scnprintf(s + ret, size - ret, "%6.6s", bf);
		}
	}

	return ret;
}

int hist_entry__snprintf(struct hist_entry *he, char *s, size_t size,
			 struct hists *hists)
{
	const char *sep = symbol_conf.field_sep;
	struct sort_entry *se;
	int ret = 0;

	list_for_each_entry(se, &hist_entry__sort_list, list) {
		if (se->elide)
			continue;

		ret += scnprintf(s + ret, size - ret, "%s", sep ?: "  ");
		ret += se->se_snprintf(he, s + ret, size - ret,
				       hists__col_len(hists, se->se_width_idx));
	}

	return ret;
}

static int hist_entry__fprintf(struct hist_entry *he, size_t size,
			       struct hists *hists, struct hists *pair_hists,
			       bool show_displacement, long displacement,
			       u64 total_period, FILE *fp)
{
	char bf[512];
	int ret;

	if (size == 0 || size > sizeof(bf))
		size = sizeof(bf);

	ret = hist_entry__pcnt_snprintf(he, bf, size, pair_hists,
					show_displacement, displacement,
					true, total_period);
	hist_entry__snprintf(he, bf + ret, size - ret, hists);
	return fprintf(fp, "%s\n", bf);
}

static size_t hist_entry__fprintf_callchain(struct hist_entry *he,
					    struct hists *hists,
					    u64 total_period, FILE *fp)
{
	int left_margin = 0;

	if (sort__first_dimension == SORT_COMM) {
		struct sort_entry *se = list_first_entry(&hist_entry__sort_list,
							 typeof(*se), list);
		left_margin = hists__col_len(hists, se->se_width_idx);
		left_margin -= thread__comm_len(he->thread);
	}

	return hist_entry_callchain__fprintf(he, total_period, left_margin, fp);
}

size_t hists__fprintf(struct hists *hists, struct hists *pair,
		      bool show_displacement, bool show_header, int max_rows,
		      int max_cols, FILE *fp)
{
	struct sort_entry *se;
	struct rb_node *nd;
	size_t ret = 0;
	u64 total_period;
	unsigned long position = 1;
	long displacement = 0;
	unsigned int width;
	const char *sep = symbol_conf.field_sep;
	const char *col_width = symbol_conf.col_width_list_str;
	int nr_rows = 0;

	init_rem_hits();

	if (!show_header)
		goto print_entries;

	fprintf(fp, "# %s", pair ? "Baseline" : "Overhead");

	if (symbol_conf.show_cpu_utilization) {
		if (sep) {
			ret += fprintf(fp, "%csys", *sep);
			ret += fprintf(fp, "%cus", *sep);
			if (perf_guest) {
				ret += fprintf(fp, "%cguest sys", *sep);
				ret += fprintf(fp, "%cguest us", *sep);
			}
		} else {
			ret += fprintf(fp, "     sys  ");
			ret += fprintf(fp, "      us  ");
			if (perf_guest) {
				ret += fprintf(fp, "  guest sys  ");
				ret += fprintf(fp, "  guest us  ");
			}
		}
	}

	if (symbol_conf.show_nr_samples) {
		if (sep)
			fprintf(fp, "%cSamples", *sep);
		else
			fputs("  Samples  ", fp);
	}

	if (symbol_conf.show_total_period) {
		if (sep)
			ret += fprintf(fp, "%cPeriod", *sep);
		else
			ret += fprintf(fp, "   Period    ");
	}

	if (pair) {
		if (sep)
			ret += fprintf(fp, "%cDelta", *sep);
		else
			ret += fprintf(fp, "  Delta    ");

		if (show_displacement) {
			if (sep)
				ret += fprintf(fp, "%cDisplacement", *sep);
			else
				ret += fprintf(fp, " Displ");
		}
	}

	list_for_each_entry(se, &hist_entry__sort_list, list) {
		if (se->elide)
			continue;
		if (sep) {
			fprintf(fp, "%c%s", *sep, se->se_header);
			continue;
		}
		width = strlen(se->se_header);
		if (symbol_conf.col_width_list_str) {
			if (col_width) {
				hists__set_col_len(hists, se->se_width_idx,
						   atoi(col_width));
				col_width = strchr(col_width, ',');
				if (col_width)
					++col_width;
			}
		}
		if (!hists__new_col_len(hists, se->se_width_idx, width))
			width = hists__col_len(hists, se->se_width_idx);
		fprintf(fp, "  %*s", width, se->se_header);
	}

	fprintf(fp, "\n");
	if (max_rows && ++nr_rows >= max_rows)
		goto out;

	if (sep)
		goto print_entries;

	fprintf(fp, "# ........");
	if (symbol_conf.show_cpu_utilization)
		fprintf(fp, "   .......   .......");
	if (symbol_conf.show_nr_samples)
		fprintf(fp, " ..........");
	if (symbol_conf.show_total_period)
		fprintf(fp, " ............");
	if (pair) {
		fprintf(fp, " ..........");
		if (show_displacement)
			fprintf(fp, " .....");
	}
	list_for_each_entry(se, &hist_entry__sort_list, list) {
		unsigned int i;

		if (se->elide)
			continue;

		fprintf(fp, "  ");
		width = hists__col_len(hists, se->se_width_idx);
		if (width == 0)
			width = strlen(se->se_header);
		for (i = 0; i < width; i++)
			fprintf(fp, ".");
	}

	fprintf(fp, "\n");
	if (max_rows && ++nr_rows >= max_rows)
		goto out;

	fprintf(fp, "#\n");
	if (max_rows && ++nr_rows >= max_rows)
		goto out;

print_entries:
	total_period = hists->stats.total_period;

	for (nd = rb_first(&hists->entries); nd; nd = rb_next(nd)) {
		struct hist_entry *h = rb_entry(nd, struct hist_entry, rb_node);

		if (h->filtered)
			continue;

		if (show_displacement) {
			if (h->pair != NULL)
				displacement = ((long)h->pair->position -
					        (long)position);
			else
				displacement = 0;
			++position;
		}
		ret += hist_entry__fprintf(h, max_cols, hists, pair, show_displacement,
					   displacement, total_period, fp);

		if (symbol_conf.use_callchain)
			ret += hist_entry__fprintf_callchain(h, hists, total_period, fp);
		if (max_rows && ++nr_rows >= max_rows)
			goto out;

		if (h->ms.map == NULL && verbose > 1) {
			__map_groups__fprintf_maps(&h->thread->mg,
						   MAP__FUNCTION, verbose, fp);
			fprintf(fp, "%.10s end\n", graph_dotted_line);
		}
	}
out:
	free(rem_sq_bracket);

	return ret;
}

size_t hists__fprintf_nr_events(struct hists *hists, FILE *fp)
{
	int i;
	size_t ret = 0;

	for (i = 0; i < PERF_RECORD_HEADER_MAX; ++i) {
		const char *name;

		if (hists->stats.nr_events[i] == 0)
			continue;

		name = perf_event__name(i);
		if (!strcmp(name, "UNKNOWN"))
			continue;

		ret += fprintf(fp, "%16s events: %10d\n", name,
			       hists->stats.nr_events[i]);
	}

	return ret;
}