// Copyright 2022 The Jujutsu Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use std::path::Path;

use crate::common::TestEnvironment;

pub mod common;

#[test]
fn test_concurrent_operation_divergence() {
    let test_env = TestEnvironment::default();
    test_env.jj_cmd_success(test_env.env_root(), &["init", "repo", "--git"]);
    let repo_path = test_env.env_root().join("repo");

    test_env.jj_cmd_success(&repo_path, &["describe", "-m", "message 1"]);
    test_env.jj_cmd_success(
        &repo_path,
        &["describe", "-m", "message 2", "--at-op", "@-"],
    );

    // We should be informed about the concurrent modification
    let stdout = test_env.jj_cmd_success(&repo_path, &["log", "-T", "description"]);
    insta::assert_snapshot!(stdout, @r###"
    Concurrent modification detected, resolving automatically.
    o  message 2
    │ @  message 1
    ├─╯
    o
    "###);
}

#[test]
fn test_concurrent_operations_auto_rebase() {
    let test_env = TestEnvironment::default();
    test_env.jj_cmd_success(test_env.env_root(), &["init", "repo", "--git"]);
    let repo_path = test_env.env_root().join("repo");

    std::fs::write(repo_path.join("file"), "contents").unwrap();
    test_env.jj_cmd_success(&repo_path, &["describe", "-m", "initial"]);
    let stdout = test_env.jj_cmd_success(&repo_path, &["op", "log"]);
    insta::assert_snapshot!(stdout, @r###"
    @  cde29280d4a9 test-username@host.example.com 22 years ago, lasted less than a microsecond
    │  describe commit 123ed18e4c4c0d77428df41112bc02ffc83fb935
    │  args: jj describe -m initial
    o  7c212e0863fd test-username@host.example.com 22 years ago, lasted less than a microsecond
    │  snapshot working copy
    │  args: jj describe -m initial
    o  a99a3fd5c51e test-username@host.example.com 22 years ago, lasted less than a microsecond
    │  add workspace 'default'
    o  56b94dfc38e7 test-username@host.example.com 22 years ago, lasted less than a microsecond
       initialize repo
    "###);
    let op_id_hex = stdout[3..15].to_string();

    test_env.jj_cmd_success(&repo_path, &["describe", "-m", "rewritten"]);
    test_env.jj_cmd_success(
        &repo_path,
        &["new", "--at-op", &op_id_hex, "-m", "new child"],
    );

    // We should be informed about the concurrent modification
    insta::assert_snapshot!(get_log_output(&test_env, &repo_path), @r###"
    Concurrent modification detected, resolving automatically.
    Rebased 1 descendant commits onto commits rewritten by other operation
    o  3f06323826b4a293a9ee6d24cc0e07ad2961b5d5 new child
    @  d91437157468ec86bbbc9e6a14a60d3e8d1790ac rewritten
    o  0000000000000000000000000000000000000000
    "###);
}

#[test]
fn test_concurrent_operations_wc_modified() {
    let test_env = TestEnvironment::default();
    test_env.jj_cmd_success(test_env.env_root(), &["init", "repo", "--git"]);
    let repo_path = test_env.env_root().join("repo");

    std::fs::write(repo_path.join("file"), "contents\n").unwrap();
    test_env.jj_cmd_success(&repo_path, &["describe", "-m", "initial"]);
    let stdout = test_env.jj_cmd_success(&repo_path, &["op", "log"]);
    let op_id_hex = stdout[3..15].to_string();

    test_env.jj_cmd_success(
        &repo_path,
        &["new", "--at-op", &op_id_hex, "-m", "new child1"],
    );
    test_env.jj_cmd_success(
        &repo_path,
        &["new", "--at-op", &op_id_hex, "-m", "new child2"],
    );
    std::fs::write(repo_path.join("file"), "modified\n").unwrap();

    // We should be informed about the concurrent modification
    insta::assert_snapshot!(get_log_output(&test_env, &repo_path), @r###"
    Concurrent modification detected, resolving automatically.
    @  4eb0610031b7cd148ff9f729a673a3f815033170 new child1
    │ o  4b20e61d23ee7d7c4d5e61e11e97c26e716f9c30 new child2
    ├─╯
    o  52c893bf3cd201e215b23e084e8a871244ca14d5 initial
    o  0000000000000000000000000000000000000000
    "###);
    let stdout = test_env.jj_cmd_success(&repo_path, &["diff", "--git"]);
    insta::assert_snapshot!(stdout, @r###"
    diff --git a/file b/file
    index 12f00e90b6...2e0996000b 100644
    --- a/file
    +++ b/file
    @@ -1,1 +1,1 @@
    -contents
    +modified
    "###);

    // The working copy should be committed after merging the operations
    let stdout = test_env.jj_cmd_success(&repo_path, &["op", "log", "-Tdescription"]);
    insta::assert_snapshot!(stdout, @r###"
    @  snapshot working copy
    o    resolve concurrent operations
    ├─╮
    o │  new empty commit
    │ o  new empty commit
    ├─╯
    o  describe commit cf911c223d3e24e001fc8264d6dbf0610804fc40
    o  snapshot working copy
    o  add workspace 'default'
    o  initialize repo
    "###);
}

fn get_log_output(test_env: &TestEnvironment, cwd: &Path) -> String {
    let template = r#"commit_id " " description"#;
    test_env.jj_cmd_success(cwd, &["log", "-T", template])
}