package core

import (
	"bytes"
	"path/filepath"
	"testing"
)

func TestNewAppRejectsNilReaders(t *testing.T) {
	t.Run("nil stdin", func(t *testing.T) {
		app, err := NewApp(nil, &bytes.Buffer{}, &bytes.Buffer{})
		if err == nil {
			t.Fatal("expected error for nil stdin")
		}
		if app != nil {
			t.Fatal("expected nil app for nil stdin")
		}
	})

	t.Run("nil stdout", func(t *testing.T) {
		app, err := NewApp(new(bytes.Buffer), nil, &bytes.Buffer{})
		if err == nil {
			t.Fatal("expected error for nil stdout")
		}
		if app != nil {
			t.Fatal("expected nil app for nil stdout")
		}
	})

	t.Run("nil stderr", func(t *testing.T) {
		app, err := NewApp(new(bytes.Buffer), &bytes.Buffer{}, nil)
		if err == nil {
			t.Fatal("expected error for nil stderr")
		}
		if app != nil {
			t.Fatal("expected nil app for nil stderr")
		}
	})
}

func TestDeriveDestination(t *testing.T) {
	tests := []struct {
		name string
		uri  string
		want string
	}{
		{name: "github short", uri: "technicalpickles/pickled-vim", want: "pickled-vim"},
		{name: "https", uri: "https://github.com/technicalpickles/pickled-vim.git", want: "pickled-vim"},
		{name: "git ssh", uri: "git@github.com:technicalpickles/pickled-vim.git", want: "pickled-vim"},
		{name: "file", uri: "file:///tmp/dotfiles.git", want: "dotfiles"},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := deriveDestination(tt.uri); got != tt.want {
				t.Fatalf("deriveDestination(%q) = %q, want %q", tt.uri, got, tt.want)
			}
		})
	}
}

func TestNewAppInitializesApp(t *testing.T) {
	stdin := new(bytes.Buffer)
	stdout := &bytes.Buffer{}
	stderr := &bytes.Buffer{}

	app, err := NewApp(stdin, stdout, stderr)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if app == nil {
		t.Fatal("expected app instance")
	}

	if app.Stdin != stdin {
		t.Fatal("expected stdin reader to be assigned")
	}
	if app.Stdout != stdout {
		t.Fatal("expected stdout writer to be assigned")
	}
	if app.Stderr != stderr {
		t.Fatal("expected stderr writer to be assigned")
	}
	if app.HomeDir == "" {
		t.Fatal("expected home directory to be set")
	}
	if app.ReposDir != filepath.Join(app.HomeDir, ".homesick", "repos") {
		t.Fatalf("unexpected repos dir: %q", app.ReposDir)
	}
}