## git2r, R bindings to the libgit2 library.
## Copyright (C) 2013-2023 The git2r contributors
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License, version 2,
## as published by the Free Software Foundation.
##
## git2r is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License along
## with this program; if not, write to the Free Software Foundation, Inc.,
## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

library(git2r)

## For debugging
sessionInfo()
libgit2_version()
libgit2_features()


## Create directories for repositories in tempdir
path_bare <- tempfile(pattern = "git2r-")
path_repo_1 <- tempfile(pattern = "git2r-")
path_repo_2 <- tempfile(pattern = "git2r-")

dir.create(path_bare)
dir.create(path_repo_1)
dir.create(path_repo_2)

## Create bare repository
bare_repo <- init(path_bare, bare = TRUE)

## Clone to repo 1
repo_1 <- clone(path_bare, path_repo_1)
config(repo_1, user.name = "Alice", user.email = "alice@example.org")

## Add changes to repo 1 and push to bare
writeLines(
    "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do",
    con = file.path(path_repo_1, "test.txt"))
add(repo_1, "test.txt")
commit(repo_1, "First commit message")
branch_name <- branches(repo_1)[[1]]$name
push(repo_1, "origin", paste0("refs/heads/", branch_name))

## Test checkout branch argument
tools::assertError(checkout(repo_1))
tools::assertError(checkout(repo_1, c("master", "master")))
tools::assertError(checkout(repo_1, "dev"))

## Create and checkout dev branch in repo 1
checkout(repo_1, "dev", create = TRUE)

## Add changes to dev branch in repo 1 and push to bare
writeLines(
    c("Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do",
      "eiusmod tempor incididunt ut labore et dolore magna aliqua."),
    con = file.path(path_repo_1, "test.txt"))
add(repo_1, "test.txt")
commit(repo_1, "Second commit message")
push(repo_1, "origin", "refs/heads/dev")

## Clone to repo 2
repo_2 <- clone(path_bare, path_repo_2)
config(repo_2, user.name = "Bob", user.email = "bob@example.org")

stopifnot(identical(
    "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do",
    readLines(file.path(path_repo_2, "test.txt"))))

## Checkout dev branch
checkout(repo_2, "dev")

## Check content of file
stopifnot(identical(
    c("Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do",
      "eiusmod tempor incididunt ut labore et dolore magna aliqua."),
    readLines(file.path(path_repo_2, "test.txt"))))

## Checkout previous branch
checkout(repo_2, "-")
stopifnot(identical(repository_head(repo_2)$name, branch_name))

## Cleanup
unlink(path_bare, recursive = TRUE)
unlink(path_repo_1, recursive = TRUE)
unlink(path_repo_2, recursive = TRUE)