#include "clar_libgit2.h"

#include "repository.h"
#include "git2/reflog.h"
#include "reflog.h"


static const char *new_ref = "refs/heads/test-reflog";
static const char *current_master_tip = "a65fedf39aefe402d3bb6e24df4d4f5fe4547750";
#define commit_msg "commit: bla bla"

static git_repository *g_repo;


// helpers
static void assert_signature(git_signature *expected, git_signature *actual)
{
	cl_assert(actual);
	cl_assert_equal_s(expected->name, actual->name);
	cl_assert_equal_s(expected->email, actual->email);
	cl_assert(expected->when.offset == actual->when.offset);
	cl_assert(expected->when.time == actual->when.time);
}


// Fixture setup and teardown
void test_refs_reflog_reflog__initialize(void)
{
   g_repo = cl_git_sandbox_init("testrepo.git");
}

void test_refs_reflog_reflog__cleanup(void)
{
   cl_git_sandbox_cleanup();
}

void test_refs_reflog_reflog__append_then_read(void)
{
   // write a reflog for a given reference and ensure it can be read back
	git_repository *repo2;
	git_reference *ref, *lookedup_ref;
	git_oid oid;
	git_signature *committer;
	git_reflog *reflog;
	const git_reflog_entry *entry;

	/* Create a new branch pointing at the HEAD */
	git_oid_fromstr(&oid, current_master_tip);
	cl_git_pass(git_reference_create_oid(&ref, g_repo, new_ref, &oid, 0));

	cl_git_pass(git_signature_now(&committer, "foo", "foo@bar"));

	cl_git_pass(git_reflog_read(&reflog, ref));

	cl_git_fail(git_reflog_append(reflog, &oid, committer, "no inner\nnewline"));
	cl_git_pass(git_reflog_append(reflog, &oid, committer, NULL));
	cl_git_pass(git_reflog_append(reflog, &oid, committer, commit_msg "\n"));
	cl_git_pass(git_reflog_write(reflog));
	git_reflog_free(reflog);

	/* Reopen a new instance of the repository */
	cl_git_pass(git_repository_open(&repo2, "testrepo.git"));

	/* Lookup the previously created branch */
	cl_git_pass(git_reference_lookup(&lookedup_ref, repo2, new_ref));

	/* Read and parse the reflog for this branch */
	cl_git_pass(git_reflog_read(&reflog, lookedup_ref));
	cl_assert_equal_i(2, git_reflog_entrycount(reflog));

	entry = git_reflog_entry_byindex(reflog, 1);
	assert_signature(committer, entry->committer);
	cl_assert(git_oid_streq(&entry->oid_old, GIT_OID_HEX_ZERO) == 0);
	cl_assert(git_oid_cmp(&oid, &entry->oid_cur) == 0);
	cl_assert(entry->msg == NULL);

	entry = git_reflog_entry_byindex(reflog, 0);
	assert_signature(committer, entry->committer);
	cl_assert(git_oid_cmp(&oid, &entry->oid_old) == 0);
	cl_assert(git_oid_cmp(&oid, &entry->oid_cur) == 0);
	cl_assert_equal_s(commit_msg, entry->msg);

	git_signature_free(committer);
	git_reflog_free(reflog);
	git_repository_free(repo2);

	git_reference_free(ref);
	git_reference_free(lookedup_ref);
}

void test_refs_reflog_reflog__renaming_the_reference_moves_the_reflog(void)
{
	git_reference *master;
	git_buf master_log_path = GIT_BUF_INIT, moved_log_path = GIT_BUF_INIT;

	git_buf_joinpath(&master_log_path, git_repository_path(g_repo), GIT_REFLOG_DIR);
	git_buf_puts(&moved_log_path, git_buf_cstr(&master_log_path));
	git_buf_joinpath(&master_log_path, git_buf_cstr(&master_log_path), "refs/heads/master");
	git_buf_joinpath(&moved_log_path, git_buf_cstr(&moved_log_path), "refs/moved");

	cl_assert_equal_i(true, git_path_isfile(git_buf_cstr(&master_log_path)));
	cl_assert_equal_i(false, git_path_isfile(git_buf_cstr(&moved_log_path)));

	cl_git_pass(git_reference_lookup(&master, g_repo, "refs/heads/master"));
	cl_git_pass(git_reference_rename(master, "refs/moved", 0));

	cl_assert_equal_i(false, git_path_isfile(git_buf_cstr(&master_log_path)));
	cl_assert_equal_i(true, git_path_isfile(git_buf_cstr(&moved_log_path)));

	git_reference_free(master);
	git_buf_free(&moved_log_path);
	git_buf_free(&master_log_path);
}

static void assert_has_reflog(bool expected_result, const char *name)
{
	git_reference *ref;

	cl_git_pass(git_reference_lookup(&ref, g_repo, name));

	cl_assert_equal_i(expected_result, git_reference_has_log(ref));

	git_reference_free(ref);
}

void test_refs_reflog_reflog__reference_has_reflog(void)
{
	assert_has_reflog(true, "HEAD");
	assert_has_reflog(true, "refs/heads/master");
	assert_has_reflog(false, "refs/heads/subtrees");
}

void test_refs_reflog_reflog__reading_the_reflog_from_a_reference_with_no_log_returns_an_empty_one(void)
{
	git_reference *subtrees;
	git_reflog *reflog;
	git_buf subtrees_log_path = GIT_BUF_INIT;

	cl_git_pass(git_reference_lookup(&subtrees, g_repo, "refs/heads/subtrees"));

	git_buf_join_n(&subtrees_log_path, '/', 3, git_repository_path(g_repo), GIT_REFLOG_DIR, git_reference_name(subtrees));
	cl_assert_equal_i(false, git_path_isfile(git_buf_cstr(&subtrees_log_path)));

	cl_git_pass(git_reflog_read(&reflog, subtrees));

	cl_assert_equal_i(0, git_reflog_entrycount(reflog));

	git_reflog_free(reflog);
	git_reference_free(subtrees);
	git_buf_free(&subtrees_log_path);
}

void test_refs_reflog_reflog__cannot_write_a_moved_reflog(void)
{
	git_reference *master;
	git_buf master_log_path = GIT_BUF_INIT, moved_log_path = GIT_BUF_INIT;
	git_reflog *reflog;

	cl_git_pass(git_reference_lookup(&master, g_repo, "refs/heads/master"));
	cl_git_pass(git_reflog_read(&reflog, master));

	cl_git_pass(git_reflog_write(reflog));
	
	cl_git_pass(git_reference_rename(master, "refs/moved", 0));

	cl_git_fail(git_reflog_write(reflog));

	git_reflog_free(reflog);
	git_reference_free(master);
	git_buf_free(&moved_log_path);
	git_buf_free(&master_log_path);
}
