/*
 * One thunk per page, each pulling the parts of the request its renderer
 * needs out of the global ctx, plus the table that maps a page name onto its
 * thunk. Keeping the thunks here lets every renderer take ordinary arguments
 * instead of reaching into the request state itself.
 */

#include "cache.h"
#include "cgit.h"
#include "cmd.h"
#include "html.h"
#include "ui-atom.h"
#include "ui-blame.h"
#include "ui-blob.h"
#include "ui-clone.h"
#include "ui-commit.h"
#include "ui-diff.h"
#include "ui-log.h"
#include "ui-patch.h"
#include "ui-plain.h"
#include "ui-refs.h"
#include "ui-repolist.h"
#include "ui-shared.h"
#include "ui-snapshot.h"
#include "ui-stats.h"
#include "ui-summary.h"
#include "ui-tag.h"
#include "ui-tree.h"

static void head_fn(void)
{
	cgit_clone_head();
}

static void about_fn(void)
{
	char *currenturl, *redirect;
	size_t path_info_len;

	if (!ctx.repo) {
		cgit_print_site_readme();
		return;
	}

	// The about page resolves relative links against its own URL, so it
	// only works with a trailing slash.
	path_info_len = ctx.env.path_info ? strlen(ctx.env.path_info) : 0;
	if (!ctx.qry.path &&
	    (!ctx.qry.url || !*ctx.qry.url ||
	     ctx.qry.url[strlen(ctx.qry.url) - 1] != '/') &&
	    (!path_info_len || ctx.env.path_info[path_info_len - 1] != '/')) {
		currenturl = cgit_currenturl();
		redirect = cgit_fmtalloc("%s/", currenturl);
		cgit_redirect(redirect, true);
		free(currenturl);
		free(redirect);
	} else if (ctx.repo->readme.nr) {
		cgit_print_repo_readme(ctx.qry.path);
	} else if (ctx.repo->homepage) {
		cgit_redirect(ctx.repo->homepage, false);
	} else {
		currenturl = cgit_currenturl();
		redirect = cgit_fmtalloc("%s../", currenturl);
		cgit_redirect(redirect, false);
		free(currenturl);
		free(redirect);
	}
}

static void atom_fn(void)
{
	cgit_print_atom(ctx.qry.head, ctx.qry.path, ctx.cfg.max_atom_items);
}

static void blame_fn(void)
{
	if (ctx.repo->enable_blame)
		cgit_print_blame();
	else
		cgit_print_error_page(403, "Forbidden", "Blame is disabled");
}

static void blob_fn(void)
{
	cgit_print_blob(ctx.qry.oid, ctx.qry.path, ctx.qry.head, 0);
}

static void commit_fn(void)
{
	cgit_print_commit(ctx.qry.oid, ctx.qry.path);
}

static void diff_fn(void)
{
	cgit_print_diff(ctx.qry.oid, ctx.qry.oid2, ctx.qry.path, 1, 0);
}

static void info_fn(void)
{
	cgit_clone_info();
}

static void log_fn(void)
{
	cgit_print_log(ctx.qry.oid, ctx.qry.ofs, ctx.cfg.max_commit_count,
		       ctx.qry.grep, ctx.qry.search, ctx.qry.path, 1,
		       ctx.repo->enable_commit_graph,
		       ctx.repo->commit_sort);
}

static void ls_cache_fn(void)
{
	// The listing names the cache path and the URLs other visitors asked
	// for, so it stays off until an administrator opts in.
	if (!ctx.cfg.enable_cache_list) {
		cgit_print_error_page(404, "Not found", "Not found");
		return;
	}
	ctx.page.mimetype = "text/plain";
	ctx.page.filename = "ls-cache.txt";
	cgit_print_http_headers();
	cache_ls(ctx.cfg.cache_root);
}

static void objects_fn(void)
{
	cgit_clone_objects();
}

static void patch_fn(void)
{
	cgit_print_patch(ctx.qry.oid, ctx.qry.oid2, ctx.qry.path);
}

static void plain_fn(void)
{
	cgit_print_plain();
}

static void rawdiff_fn(void)
{
	cgit_print_diff(ctx.qry.oid, ctx.qry.oid2, ctx.qry.path, 1, 1);
}

static void refs_fn(void)
{
	cgit_print_refs();
}

static void repolist_fn(void)
{
	cgit_print_repolist();
}

static void snapshot_fn(void)
{
	cgit_print_snapshot(ctx.qry.head, ctx.qry.oid, ctx.qry.path,
			    ctx.qry.nohead);
}

static void stats_fn(void)
{
	if (ctx.repo->enable_stats)
		cgit_show_stats();
	else
		cgit_print_error_page(404, "Not found", "Stats are disabled");
}

static void summary_fn(void)
{
	cgit_print_summary();
}

static void tag_fn(void)
{
	cgit_print_tag(ctx.qry.oid);
}

static void tree_fn(void)
{
	cgit_print_tree(ctx.qry.oid, ctx.qry.path);
}

// The name is what a request spells as p=, so these strings are part of the
// URL space and cannot be renamed.
static const struct cgit_cmd commands[] = {
	{ .name = "HEAD", .fn = head_fn, .want_repo = 1, .is_clone = 1 },
	{ .name = "about", .fn = about_fn },
	{ .name = "atom", .fn = atom_fn, .want_repo = 1 },
	{ .name = "blame", .fn = blame_fn, .want_repo = 1, .want_vpath = 1 },
	{ .name = "blob", .fn = blob_fn, .want_repo = 1 },
	{ .name = "commit", .fn = commit_fn, .want_repo = 1, .want_vpath = 1 },
	{ .name = "diff", .fn = diff_fn, .want_repo = 1, .want_vpath = 1 },
	{ .name = "info", .fn = info_fn, .want_repo = 1, .is_clone = 1 },
	{ .name = "log", .fn = log_fn, .want_repo = 1, .want_vpath = 1 },
	{ .name = "ls_cache", .fn = ls_cache_fn },
	{ .name = "objects", .fn = objects_fn, .want_repo = 1, .is_clone = 1 },
	{ .name = "patch", .fn = patch_fn, .want_repo = 1, .want_vpath = 1 },
	{ .name = "plain", .fn = plain_fn, .want_repo = 1 },
	{ .name = "rawdiff", .fn = rawdiff_fn, .want_repo = 1, .want_vpath = 1 },
	{ .name = "refs", .fn = refs_fn, .want_repo = 1 },
	{ .name = "repolist", .fn = repolist_fn },
	{ .name = "snapshot", .fn = snapshot_fn, .want_repo = 1 },
	{ .name = "stats", .fn = stats_fn, .want_repo = 1, .want_vpath = 1 },
	{ .name = "summary", .fn = summary_fn, .want_repo = 1 },
	{ .name = "tag", .fn = tag_fn, .want_repo = 1 },
	{ .name = "tree", .fn = tree_fn, .want_repo = 1, .want_vpath = 1 },
};

const struct cgit_cmd *cgit_get_cmd(void)
{
	size_t i;

	if (ctx.qry.page == NULL) {
		if (ctx.repo)
			ctx.qry.page = "summary";
		else
			ctx.qry.page = "repolist";
	}

	for (i = 0; i < ARRAY_SIZE(commands); i++)
		if (!strcmp(ctx.qry.page, commands[i].name))
			return &commands[i];
	return NULL;
}