use assert2::let_assert;

use kxio::fs;

type TestResult = Result<(), fs::Error>;

mod path {
    use super::*;

    mod path_of {
        use super::*;

        #[test]
        fn should_fail_on_path_traversal() -> TestResult {
            let fs = fs::temp().expect("temp fs");

            let_assert!(
                Err(fs::Error::PathTraversal { base, path: _path }) = fs.path_of("..".into())
            );
            assert_eq!(base, fs.base());

            Ok(())
        }

        #[test]
        fn matches_joins() -> TestResult {
            let fs = fs::temp().expect("temp fs");

            let joined = fs.base().join("foo").join("bar");
            let path_of = fs
                .path_of("foo/bar".into())
                .expect("parse foo/bar into path");

            assert_eq!(joined, path_of);

            Ok(())
        }
    }

    mod as_dir {
        use super::*;

        #[test]
        fn path_is_dir_as_dir_some() -> TestResult {
            let fs = fs::temp().expect("temp fs");

            let path = fs.base().join("foo");
            let dir = fs.dir(&path);
            dir.create().expect("create");

            let_assert!(Ok(Some(as_dir)) = fs.path(&path).as_dir());

            assert_eq!(dir.as_pathbuf(), as_dir.as_pathbuf());

            Ok(())
        }

        #[test]
        fn path_is_file_as_dir_none() -> TestResult {
            let fs = fs::temp().expect("temp fs");

            let path = fs.base().join("foo");
            let file = fs.file(&path);
            file.write("contents").expect("create");

            let_assert!(Ok(Some(as_file)) = fs.path(&path).as_file());

            assert_eq!(file.as_pathbuf(), as_file.as_pathbuf());
            assert_eq!(as_file.reader().expect("reader").to_string(), "contents");

            Ok(())
        }
    }
    mod as_file {
        use super::*;
        #[test]
        fn path_is_dir_as_file_none() -> TestResult {
            let fs = fs::temp().expect("temp fs");

            let path = fs.base().join("foo");
            let dir = fs.dir(&path);
            dir.create().expect("create");

            let_assert!(Ok(None) = fs.path(&path).as_file());

            Ok(())
        }
        #[test]
        fn path_is_file_as_file_some() -> TestResult {
            let fs = fs::temp().expect("temp fs");

            let path = fs.base().join("foo");
            let file = fs.file(&path);
            file.write("contents").expect("create");

            let_assert!(Ok(None) = fs.path(&path).as_dir());

            Ok(())
        }
    }
    mod is_dir {
        use super::*;
        #[test]
        fn should_be_true_when_is_a_dir() -> TestResult {
            let fs = fs::temp().expect("temp fs");
            let path = fs.base().join("foo");
            fs.dir(&path).create().expect("create");
            let is_dir = fs.path(&path).is_dir().expect("is_dir");
            assert!(is_dir);

            Ok(())
        }
        #[test]
        fn should_be_false_when_is_a_file() -> TestResult {
            let fs = fs::temp().expect("temp fs");
            let path = fs.base().join("foo");
            fs.file(&path).write("bar").expect("write");
            let is_dir = fs.path(&path).is_dir().expect("is_dir");
            assert!(!is_dir);

            Ok(())
        }
        #[test]
        #[ignore]
        fn should_be_false_when_is_a_link() -> TestResult {
            let fs = fs::temp().expect("temp fs");
            let path = fs.base().join("foo");
            // TODO: (#38) create a link
            // let_assert!(Ok(_) = fs.file_write(&path, "bar"));
            let is_dir = fs.path(&path).is_dir().expect("is_dir");
            assert!(!is_dir);

            Ok(())
        }
        #[test]
        fn should_fail_on_path_traversal() -> TestResult {
            let fs = fs::temp().expect("temp fs");
            let path = fs.base().join("..").join("foo");
            let_assert!(
                Err(fs::Error::PathTraversal {
                    base: _base,
                    path: _path
                }) = fs.dir(&path).is_dir()
            );

            Ok(())
        }
    }
    mod exists {
        use super::*;
        #[test]
        fn should_be_true_when_it_exists() -> TestResult {
            let fs = fs::temp().expect("temp fs");
            let path = fs.base().join("foo");
            fs.file(&path).write("bar").expect("write");
            let exists = fs.path(&path).exists().expect("exists");
            assert!(exists);

            Ok(())
        }
        #[test]
        fn should_be_false_when_it_does_not_exist() -> TestResult {
            let fs = fs::temp().expect("temp fs");
            let path = fs.base().join("foo");
            let exists = fs.path(&path).exists().expect("exists");
            assert!(!exists);

            Ok(())
        }
        #[test]
        fn should_fail_on_path_traversal() -> TestResult {
            let fs = fs::temp().expect("temp fs");
            let path = fs.base().join("..").join("foo");
            let_assert!(
                Err(fs::Error::PathTraversal {
                    base: _base,
                    path: _path
                }) = fs.path(&path).exists()
            );

            Ok(())
        }
    }
    mod is_file {
        use super::*;
        #[test]
        fn should_be_true_when_is_a_file() -> TestResult {
            let fs = fs::temp().expect("temp fs");
            let path = fs.base().join("foo");
            fs.file(&path).write("bar").expect("write");

            let is_file = fs.path(&path).is_file().expect("is_file");
            assert!(is_file);

            Ok(())
        }
        #[test]
        fn should_be_false_when_is_a_dir() -> TestResult {
            let fs = fs::temp().expect("temp fs");
            let path = fs.base().join("foo");
            fs.dir(&path).create().expect("create");
            let is_file = fs.path(&path).is_file().expect("is_file");
            assert!(!is_file);

            Ok(())
        }
        #[test]
        #[ignore]
        fn should_be_false_when_is_a_link() -> TestResult {
            let fs = fs::temp().expect("temp fs");
            let path = fs.base().join("foo");
            // TODO: (#38) create a link
            // let_assert!(Ok(_) = fs.file_write(&path, "bar"));
            let is_file = fs.path(&path).is_file().expect("is_file");
            assert!(!is_file);

            Ok(())
        }
        #[test]
        fn should_fail_on_path_traversal() -> TestResult {
            let fs = fs::temp().expect("temp fs");
            let path = fs.base().join("..").join("foo");
            let_assert!(
                Err(fs::Error::PathTraversal {
                    base: _base,
                    path: _path
                }) = fs.file(&path).is_file()
            );

            Ok(())
        }
    }
    mod rename {
        use super::*;
        #[test]
        fn should_rename_a_file() -> TestResult {
            let fs = fs::temp().expect("temp fs");
            let src_path = fs.base().join("foo");
            let src = fs.file(&src_path);
            src.write("bar").expect("write");
            let src_contents = src.reader().expect("reader").to_string();
            let dst_path = fs.base().join("bar");
            let dst = fs.file(&dst_path);
            src.rename(&dst).expect("rename");
            let dst_contents = dst.reader().expect("reader").to_string();
            assert_eq!(src_contents, dst_contents);
            let src_exists = src.exists().expect("exists");
            assert!(!src_exists);

            Ok(())
        }

        #[test]
        fn should_fail_on_path_traversal() -> TestResult {
            let fs = fs::temp().expect("temp fs");
            let src_path = fs.base().join("..").join("foo");
            let_assert!(
                Err(fs::Error::PathTraversal {
                    base: _base,
                    path: _path
                }) = fs.file(&src_path).rename(&fs.file(&src_path))
            );

            Ok(())
        }
    }
}

mod file {
    use super::*;

    #[test]
    fn create_hard_link() -> TestResult {
        let fs = fs::temp().expect("temp fs");
        let file_path = fs.base().join("foo");
        let file = fs.file(&file_path);
        file.write("content").expect("write");
        let link_path = fs.base().join("bar");
        let link = fs.file(&link_path);
        file.hard_link(&link).expect("hard_link");
        let exists = link.exists().expect("exists");
        assert!(exists);

        Ok(())
    }

    #[test]
    /// Write to a file, read it, verify it exists, is a file and has the expected contents
    fn write_read_file_exists() -> TestResult {
        let fs = fs::temp().expect("temp fs");
        let pathbuf = fs.base().join("foo");

        let file = fs.file(&pathbuf);
        file.write("content").expect("write");
        let c = file.reader().expect("reader").to_string();
        assert_eq!(c, "content");

        let path = fs.path(&pathbuf);
        let exists = path.exists().expect("exists");
        assert!(exists);

        let is_file = path.is_file().expect("is_file");
        assert!(is_file);

        Ok(())
    }

    mod remove {
        use super::*;
        #[test]
        fn should_remove_a_file() -> TestResult {
            let fs = fs::temp().expect("temp fs");
            let path = fs.base().join("foo");
            let file = fs.file(&path);
            file.write("bar").expect("write");
            file.remove().expect("remove");
            let exists = file.exists().expect("exists");
            assert!(!exists);

            Ok(())
        }

        #[test]
        fn should_fail_on_path_traversal() -> TestResult {
            let fs = fs::temp().expect("temp fs");
            let path = fs.base().join("..").join("foo");
            let_assert!(
                Err(fs::Error::PathTraversal {
                    base: _base,
                    path: _path
                }) = fs.file(&path).remove()
            );

            Ok(())
        }
    }
    mod copy {
        use super::*;
        #[test]
        fn should_copy_a_file() -> TestResult {
            let fs = fs::temp().expect("temp fs");
            let src_path = fs.base().join("foo");
            let src = fs.file(&src_path);
            src.write("bar").expect("write");
            let dst_path = fs.base().join("bar");
            let dst = fs.file(&dst_path);
            src.copy(&dst).expect("copy");
            let src_contents = src.reader().expect("reader").to_string();
            let dst_contents = dst.reader().expect("reader").to_string();
            assert_eq!(src_contents, dst_contents);

            Ok(())
        }
    }
    mod reader {
        use super::*;
        mod to_string {
            use super::*;
            #[test]
            fn read_file_to_string() -> TestResult {
                let fs = fs::temp().expect("temp fs");

                let path = fs.base().join("foo");
                let file = fs.file(&path);
                file.write("line 1\nline 2").expect("write");

                let reader = file.reader().expect("reader");
                let string = reader.to_string();

                assert_eq!(string, "line 1\nline 2");

                Ok(())
            }
        }
        mod lines {
            use super::*;
            #[test]
            fn read_file_lines() -> TestResult {
                let fs = fs::temp().expect("temp fs");

                let path = fs.base().join("foo");
                let file = fs.file(&path);
                file.write("line 1\nline 2").expect("write");

                let reader = file.reader().expect("reader");
                let lines = reader.lines().collect::<Vec<_>>();

                assert_eq!(lines, vec!["line 1", "line 2"]);

                Ok(())
            }
        }
        mod bytes {
            use super::*;
            #[test]
            fn should_return_bytes() -> TestResult {
                let fs = fs::temp().expect("temp fs");
                let path = fs.base().join("foo");
                let file = fs.file(&path);
                file.write("bar").expect("write");
                let reader = file.reader().expect("reader");
                let bytes = reader.bytes();
                assert_eq!(bytes.len(), 3);
                assert_eq!(bytes[0], b'b');
                assert_eq!(bytes[1], b'a');
                assert_eq!(bytes[2], b'r');

                Ok(())
            }
        }
    }
}
mod dir {
    use super::*;

    mod create {
        use super::*;
        #[test]
        fn should_create_a_dir() -> TestResult {
            let fs = fs::temp().expect("temp fs");
            let pathbuf = fs.base().join("subdir");

            fs.dir(&pathbuf).create().expect("create");

            let exists = fs.path(&pathbuf).exists().expect("exitss");
            assert!(exists);

            let is_dir = fs.path(&pathbuf).is_dir().expect("is dir");
            assert!(is_dir);

            Ok(())
        }
        #[test]
        fn should_fail_on_path_traversal() -> TestResult {
            let fs = fs::temp().expect("temp fs");
            let path = fs.base().join("..").join("foo");
            let_assert!(
                Err(fs::Error::PathTraversal {
                    base: _base,
                    path: _path
                }) = fs.dir(&path).create()
            );

            Ok(())
        }
    }

    mod create_all {
        use super::*;

        #[test]
        fn should_create_a_dir() -> TestResult {
            let fs = fs::temp().expect("temp fs");
            let pathbuf = fs.base().join("subdir").join("child");

            fs.dir(&pathbuf).create_all().expect("create_all");

            let path = fs.path(&pathbuf);
            let exists = path.exists().expect("exists");
            assert!(exists, "path exists");

            let is_dir = path.is_dir().expect("is_dir");
            assert!(is_dir, "path is a directory");

            Ok(())
        }
        #[test]
        fn should_fail_on_path_traversal() -> TestResult {
            let fs = fs::temp().expect("temp fs");
            let path = fs.base().join("..").join("foo");
            let_assert!(
                Err(fs::Error::PathTraversal {
                    base: _base,
                    path: _path
                }) = fs.dir(&path).create_all()
            );

            Ok(())
        }
    }

    mod read {
        use crate::fs::DirItem;

        use super::*;

        #[test]
        fn should_return_dir_items() -> TestResult {
            let fs = fs::temp().expect("temp fs");
            let file1 = fs.base().join("file-1");
            let dir = fs.base().join("dir");
            let file2 = dir.join("file-2");
            fs.file(&file1).write("file-1").expect("write: file-1");
            fs.dir(&dir).create().expect("create dir");
            fs.file(&file2).write("file-2").expect("write: file-2");

            let items = fs
                .dir(fs.base())
                .read()
                .expect("dir.read")
                .filter_map(|i| i.ok())
                .collect::<Vec<_>>();

            assert_eq!(items.len(), 2);
            assert!(items.contains(&DirItem::File(file1)));
            assert!(items.contains(&DirItem::Dir(dir)));

            Ok(())
        }
        #[test]
        fn should_fail_on_not_a_dir() -> TestResult {
            let fs = fs::temp().expect("temp fs");
            let path = fs.base().join("file");
            fs.file(&path).write("contents").expect("write");

            let_assert!(Err(fs::Error::NotADirectory { path: _path }) = fs.dir(&path).read());

            Ok(())
        }
        #[test]
        fn should_fail_on_path_traversal() -> TestResult {
            let fs = fs::temp().expect("temp fs");
            let path = fs.base().join("..").join("foo");
            let_assert!(
                Err(fs::Error::PathTraversal {
                    base: _base,
                    path: _path
                }) = fs.dir(&path).read()
            );

            Ok(())
        }
    }
    mod remove {
        use super::*;
        #[test]
        fn should_remove_a_dir() -> TestResult {
            let fs = fs::temp().expect("temp fs");
            let path = fs.base().join("foo");
            fs.dir(&path).create().expect("create");
            fs.dir(&path).remove().expect("remove");
            let exists = fs.path(&path).exists().expect("exists");
            assert!(!exists);

            Ok(())
        }

        #[test]
        fn should_fail_on_path_traversal() -> TestResult {
            let fs = fs::temp().expect("temp fs");
            let path = fs.base().join("..").join("foo");
            let_assert!(
                Err(fs::Error::PathTraversal {
                    base: _base,
                    path: _path
                }) = fs.dir(&path).remove()
            );

            Ok(())
        }
    }

    mod remove_all {
        use super::*;
        #[test]
        fn should_remove_a_dir() -> TestResult {
            let fs = fs::temp().expect("temp fs");
            let path = fs.base().join("foo");
            let dir = fs.dir(&path);
            dir.create().expect("create dir");
            let sub_path = path.join("sub");
            let sub = fs.dir(&sub_path);
            sub.create().expect("create sub");
            let file = sub_path.join("file");
            fs.file(&file).write("contents").expect("write");

            dir.remove_all().expect("remove");
            let exists = dir.exists().expect("exists");
            assert!(!exists);

            Ok(())
        }
        #[test]
        fn should_fail_on_path_traversal() -> TestResult {
            let fs = fs::temp().expect("temp fs");
            let path = fs.base().join("..").join("foo");
            let_assert!(
                Err(fs::Error::PathTraversal {
                    base: _base,
                    path: _path
                }) = fs.dir(&path).remove_all()
            );

            Ok(())
        }
    }
}