/* ui-commit.c: generate commit view
 *
 * Copyright (C) 2006 Lars Hjemli
 *
 * Licensed under GNU General Public License v2
 *   (see COPYING for full license text)
 */

#include "cgit.h"

int files = 0, slots = 0;
int total_adds = 0, total_rems = 0, max_changes = 0;
int lines_added, lines_removed;

struct fileinfo {
	char status;
	unsigned char old_sha1[20];
	unsigned char new_sha1[20];
	unsigned short old_mode;
	unsigned short new_mode;
	char *old_path;
	char *new_path;
	unsigned int added;
	unsigned int removed;
} *items;


void print_fileinfo(struct fileinfo *info)
{
	char *query, *query2;
	char *class;
	double width;

	switch (info->status) {
	case DIFF_STATUS_ADDED:
		class = "add";
		break;
	case DIFF_STATUS_COPIED:
		class = "cpy";
		break;
	case DIFF_STATUS_DELETED:
		class = "del";
		break;
	case DIFF_STATUS_MODIFIED:
		class = "upd";
		break;
	case DIFF_STATUS_RENAMED:
		class = "mov";
		break;
	case DIFF_STATUS_TYPE_CHANGED:
		class = "typ";
		break;
	case DIFF_STATUS_UNKNOWN:
		class = "unk";
		break;
	case DIFF_STATUS_UNMERGED:
		class = "stg";
		break;
	default:
		die("bug: unhandled diff status %c", info->status);
	}

	html("<tr>");
	htmlf("<td class='mode'>");
	if (is_null_sha1(info->new_sha1)) {
		html_filemode(info->old_mode);
	} else {
		html_filemode(info->new_mode);
	}

	if (info->old_mode != info->new_mode &&
	    !is_null_sha1(info->old_sha1) &&
	    !is_null_sha1(info->new_sha1)) {
		html("<span class='modechange'>[");
		html_filemode(info->old_mode);
		html("]</span>");
	}
	htmlf("</td><td class='%s'>", class);
	query = fmt("id=%s&id2=%s&path=%s", sha1_to_hex(info->old_sha1),
		    sha1_to_hex(info->new_sha1), info->new_path);
	html_link_open(cgit_pageurl(cgit_query_repo, "diff", query),
		       NULL, NULL);
	if (info->status == DIFF_STATUS_COPIED ||
	    info->status == DIFF_STATUS_RENAMED) {
		html_txt(info->new_path);
		htmlf("</a> (%s from ", info->status == DIFF_STATUS_COPIED ?
		      "copied" : "renamed");
		query2 = fmt("id=%s", sha1_to_hex(info->old_sha1));
		html_link_open(cgit_pageurl(cgit_query_repo, "view", query2),
			       NULL, NULL);
		html_txt(info->old_path);
		html("</a>)");
	} else {
		html_txt(info->new_path);
		html("</a>");
	}
	html("</td><td class='right'>");
	htmlf("%d", info->added + info->removed);

	html("</td><td class='graph'>");
	width = (info->added + info->removed) * 100.0 / max_changes;
	if (width < 0.1)
		width = 0.1;
	html_link_open(cgit_pageurl(cgit_query_repo, "diff", query),
		       NULL, NULL);
	htmlf("<img src='/cgit/add.png' style='width: %.1f%%;'/>",
	      info->added * width / (info->added + info->removed));
	htmlf("<img src='/cgit/del.png' style='width: %.1f%%;'/>",
	      info->removed * width / (info->added + info->removed));
	html("</a></td></tr>\n");
}

void cgit_count_diff_lines(char *line, int len)
{
	if (line && (len > 0)) {
		if (line[0] == '+')
			lines_added++;
		else if (line[0] == '-')
			lines_removed++;
	}
}

void inspect_filepair(struct diff_filepair *pair)
{
	files++;
	lines_added = 0;
	lines_removed = 0;
	cgit_diff_files(pair->one->sha1, pair->two->sha1, cgit_count_diff_lines);
	if (files >= slots) {
		if (slots == 0)
			slots = 4;
		else
			slots = slots * 2;
		items = xrealloc(items, slots * sizeof(struct fileinfo));
	}
	items[files-1].status = pair->status;
	hashcpy(items[files-1].old_sha1, pair->one->sha1);
	hashcpy(items[files-1].new_sha1, pair->two->sha1);
	items[files-1].old_mode = pair->one->mode;
	items[files-1].new_mode = pair->two->mode;
	items[files-1].old_path = xstrdup(pair->one->path);
	items[files-1].new_path = xstrdup(pair->two->path);
	items[files-1].added = lines_added;
	items[files-1].removed = lines_removed;
	if (lines_added + lines_removed > max_changes)
		max_changes = lines_added + lines_removed;
	total_adds += lines_added;
	total_rems += lines_removed;
}


void cgit_print_commit(const char *hex)
{
	struct commit *commit, *parent;
	struct commitinfo *info;
	struct commit_list *p;
	unsigned char sha1[20];
	char *query;
	char *filename;
	int i;

	if (get_sha1(hex, sha1)) {
		cgit_print_error(fmt("Bad object id: %s", hex));
		return;
	}
	commit = lookup_commit_reference(sha1);
	if (!commit) {
		cgit_print_error(fmt("Bad commit reference: %s", hex));
		return;
	}
	info = cgit_parse_commit(commit);

	html("<table class='commit-info'>\n");
	html("<tr><th>author</th><td>");
	html_txt(info->author);
	html(" ");
	html_txt(info->author_email);
	html("</td><td class='right'>");
	cgit_print_date(info->author_date);
	html("</td></tr>\n");
	html("<tr><th>committer</th><td>");
	html_txt(info->committer);
	html(" ");
	html_txt(info->committer_email);
	html("</td><td class='right'>");
	cgit_print_date(info->committer_date);
	html("</td></tr>\n");
	html("<tr><th>tree</th><td colspan='2' class='sha1'><a href='");
	query = fmt("h=%s&id=%s", sha1_to_hex(commit->object.sha1),
		    sha1_to_hex(commit->tree->object.sha1));
	html_attr(cgit_pageurl(cgit_query_repo, "tree", query));
	htmlf("'>%s</a></td></tr>\n", sha1_to_hex(commit->tree->object.sha1));
      	for (p = commit->parents; p ; p = p->next) {
		parent = lookup_commit_reference(p->item->object.sha1);
		if (!parent) {
			html("<tr><td colspan='3'>");
			cgit_print_error("Error reading parent commit");
			html("</td></tr>");
			continue;
		}
		html("<tr><th>parent</th>"
		     "<td colspan='2' class='sha1'>"
		     "<a href='");
		query = fmt("id=%s", sha1_to_hex(p->item->object.sha1));
		html_attr(cgit_pageurl(cgit_query_repo, "commit", query));
		htmlf("'>%s</a> (<a href='",
		      sha1_to_hex(p->item->object.sha1));
		query = fmt("id=%s&id2=%s", sha1_to_hex(parent->tree->object.sha1),
			    sha1_to_hex(commit->tree->object.sha1));
		html_attr(cgit_pageurl(cgit_query_repo, "diff", query));
		html("'>diff</a>)</td></tr>");
	}
	if (cgit_repo->snapshots) {
		htmlf("<tr><th>download</th><td colspan='2' class='sha1'><a href='");
		filename = fmt("%s-%s.zip", cgit_query_repo, hex);
		html_attr(cgit_pageurl(cgit_query_repo, "snapshot",
				       fmt("id=%s&name=%s", hex, filename)));
		htmlf("'>%s</a></td></tr>", filename);
	}
	html("</table>\n");
	html("<div class='commit-subject'>");
	html_txt(info->subject);
	html("</div>");
	html("<div class='commit-msg'>");
	html_txt(info->msg);
	html("</div>");
	if (!(commit->parents && commit->parents->next && commit->parents->next->next)) {
		html("<table class='diffstat'>");
		max_changes = 0;
		cgit_diff_commit(commit, inspect_filepair);
		for(i = 0; i<files; i++)
			print_fileinfo(&items[i]);
		html("</table>");
		html("<div class='diffstat-summary'>");
		htmlf("%d files changed, %d insertions, %d deletions\n",
		      files, total_adds, total_rems);
		html("</div>");
	}
	cgit_free_commitinfo(info);
}