import datetime
import json
import os
import tempfile

from yird.settings import Settings


def setup():
    # Tears down automatically when variable goes out of scope
    temp_dir = tempfile.TemporaryDirectory()

    os.environ["YIRD_PATH"] = temp_dir.name
    os.mkdir(os.path.join(temp_dir.name, 'posts'))
    os.mkdir(os.path.join(temp_dir.name, 'templates'))
    os.mkdir(os.path.join(temp_dir.name, 'public'))
    with open(os.path.join(temp_dir.name, 'settings.json'), "w") as f:
        f.write(json.dumps({
            "PUBLIC_PATH": os.path.join(temp_dir.name, 'public'),
            "SITE_NAME": "test website",
            "MARKDOWN_PREVIEW": True
        }))

    # Importing PostsService initializes a Settings object which depends on
    # YIRD_PATH already being set, and needs to be reinitialized between tests,
    # so we're doing all that explicitly in the setup
    from yird.services.posts import PostsService
    PostsService.settings = Settings()

    return temp_dir, PostsService


def test_create_post():
    # Setup
    root, PostsService = setup()

    # Create a post
    post = PostsService.create_post({
        "title": "Test Post",
        "slug": "test-post",
        "date": "2000-01-01",
        "content": "# Lorem ipsum dolor sit amet"
    })

    # Read metadata and contents files
    with open(os.path.join(root.name, 'posts', post.id + '.json')) as f:
        metadata = json.loads(f.read())
    with open(os.path.join(root.name, 'posts', post.id + '.md')) as f:
        content = f.read()

    # Assert metadata
    assert metadata == {
        "id": post.id,
        "title": "Test Post",
        "slug": "test-post",
        "date": "2000-01-01",
        "changed": True
    }

    # Assert content
    assert content == "# Lorem ipsum dolor sit amet"


def test_get_post():
    _root, PostsService = setup()

    # Create a post
    post = PostsService.create_post({
        "title": "Test Post",
        "slug": "test-post",
        "date": "2000-01-01",
        "content": "# Lorem ipsum dolor sit amet"
    })

    # Get the post
    post = PostsService.get_post(post.id)

    # Assert post data
    assert post.title == "Test Post"
    assert post.slug == "test-post"
    assert post.date == datetime.date.fromisoformat("2000-01-01")
    assert post.content == "# Lorem ipsum dolor sit amet"


def test_get_posts():
    _root, PostsService = setup()

    # Create a couple of posts
    post1 = PostsService.create_post({
        "title": "Test Post 1",
        "slug": "test-post-1",
        "date": "2000-01-01",
        "content": "# Lorem ipsum dolor sit amet"
    })
    post2 = PostsService.create_post({
        "title": "Test Post 2",
        "slug": "test-post-2",
        "date": "2000-01-02",
        "content": "# Lorem ipsum dolor sit amet"
    })

    # Get the post and sort by title
    posts = PostsService.get_posts()
    posts = sorted(posts, key=lambda post: post.title)

    # Assert the post data
    assert posts[0].id == post1.id
    assert posts[0].title == "Test Post 1"
    assert posts[0].slug == "test-post-1"
    assert posts[0].date == datetime.date.fromisoformat("2000-01-01")
    assert posts[0].content == "# Lorem ipsum dolor sit amet"
    assert posts[1].id == post2.id
    assert posts[1].title == "Test Post 2"
    assert posts[1].slug == "test-post-2"
    assert posts[1].date == datetime.date.fromisoformat("2000-01-02")
    assert posts[1].content == "# Lorem ipsum dolor sit amet"


def test_generate_posts():
    root, PostsService = setup()

    # Create post template
    with open(os.path.join(root.name, 'templates', 'post.html'), "w") as f:
        f.write('''
<div><h1>{{ post.title }}</h1><div>{{ post.content }}</div></div>
    ''')

    # Create post
    post = PostsService.create_post({
        "title": "Test Post",
        "slug": "test-post",
        "date": "2000-01-01",
        "content": "# Lorem ipsum dolor sit amet"
    })

    # Generate post
    PostsService.generate_posts()

    # Assert generated HTML
    with open(os.path.join(root.name, 'public', post.id, 'index.html')) as f:
        contents = f.read()
    assert contents == '''
<div><h1>Test Post</h1><div><h1>Lorem ipsum dolor sit amet</h1></div></div>
    '''

    # Assert that generating the post marks the post unchanged
    with open(os.path.join(root.name, 'posts', post.id + '.json')) as f:
        metadata = json.loads(f.read())
    assert metadata["changed"] is False


def test_update_post():
    _root, PostsService = setup()

    # Create post
    post = PostsService.create_post({
        "title": "Test Post",
        "slug": "test-post",
        "date": "2000-01-01",
        "content": "# Lorem ipsum dolor sit amet"
    })

    # Update post
    PostsService.update_post(post.id, {
        "id": post.id,
        "title": "Edited Title",
        "slug": "edited-slug",
        "date": "2000-01-01",
        "content": "# Lorem ipsum dolor sit amet",
    })

    # Load metadata
    metadata = post.load_metadata()

    # Assert that the title and slug changed
    assert metadata["title"] == "Edited Title"
    assert metadata["slug"] == "edited-slug"


def test_get_post_form():
    _root, PostsService = setup()
    form = PostsService.get_post_form()
    assert form.data == {
        "title": None,
        "slug": None,
        "date": datetime.date.today(),
        "content": None
    }

    post = PostsService.create_post({
        "title": "Test Post",
        "slug": "test-post",
        "date": "2000-01-01",
        "content": "# Lorem ipsum dolor sit amet"
    })
    form = PostsService.get_post_form(post)
    assert form.data == {
        "title": "Test Post",
        "slug": "test-post",
        "date": datetime.date.fromisoformat("2000-01-01"),
        "content": "# Lorem ipsum dolor sit amet"
    }