import datetime as dt
import os
import sqlite3
from types import SimpleNamespace

import pytest
from fastapi.testclient import TestClient


def is_roughly_now(datetime_str):
    """Check if a datetime string is roughly from now"""
    now = dt.datetime.now(dt.timezone.utc)
    datetime = dt.datetime.fromisoformat(datetime_str)
    # set timezone, otherwise cannot subtract
    datetime = datetime.replace(tzinfo=dt.timezone.utc)
    return (now - datetime).total_seconds() < 3


class TestWebservice:
    @pytest.fixture(autouse=True)
    def db_file(self, tmp_path):
        filename = tmp_path / "test-db.sqlite"
        os.environ["DB_FILE_NAME"] = str(filename)

    @pytest.fixture
    def cursor(self):
        from gistillery.db import get_db_cursor

        with get_db_cursor() as cursor:
            yield cursor

    @pytest.fixture
    def client(self):
        from gistillery.webservice import app

        client = TestClient(app)
        client.get("/clear")
        return client

    @pytest.fixture
    def registry(self):
        # use dummy models
        from gistillery.tools import Summarizer, Tagger
        from gistillery.preprocessing import RawTextProcessor
        from gistillery.registry import ToolRegistry

        class DummySummarizer(Summarizer):
            """Returns the first 10 characters of the input"""
            def get_name(self):
                return "dummy summarizer"

            def __call__(self, x):
                return x[:10]

        class DummyTagger(Tagger):
            """Returns the first 3 words of the input"""
            def get_name(self):
                return "dummy tagger"

            def __call__(self, x):
                return ["#" + word for word in x.split(maxsplit=4)[:3]]

        registry = ToolRegistry()
        registry.register_processor(RawTextProcessor())

        # arguments don't matter for dummy summarizer and tagger
        summarizer = DummySummarizer()
        registry.register_summarizer(summarizer)

        tagger = DummyTagger()
        registry.register_tagger(tagger)
        return registry

    def process_jobs(self, registry):
        # emulate work of the background worker
        from gistillery.worker import check_pending_jobs, process_job

        jobs = check_pending_jobs()
        for job in jobs:
            process_job(job, registry)

    def test_status(self, client):
        resp = client.get("/status")
        assert resp.status_code == 200
        assert resp.json() == "OK"

    def test_recent_empty(self, client):
        resp = client.get("/recent")
        assert resp.json() == []

    def test_recent_tag_empty(self, client):
        resp = client.get("/recent/general")
        assert resp.json() == []

    def test_submitted_job_status_pending(self, client, monkeypatch):
        # monkeypatch uuid4 to return a known value
        job_id = "abc1234"
        monkeypatch.setattr("uuid.uuid4", lambda: SimpleNamespace(hex=job_id))
        client.post("/submit", json={"author": "ben", "content": "this is a test"})

        resp = client.get(f"/check_job_status/{job_id}")
        output = resp.json()
        last_updated = output.pop("last_updated")
        assert output == {
            "id": job_id,
            "status": "pending",
        }
        assert is_roughly_now(last_updated)

    def test_submitted_job_status_not_found(self, client, monkeypatch):
        # monkeypatch uuid4 to return a known value
        job_id = "abc1234"
        monkeypatch.setattr("uuid.uuid4", lambda: SimpleNamespace(hex=job_id))
        client.post("/submit", json={"author": "ben", "content": "this is a test"})

        other_job_id = "def5678"
        resp = client.get(f"/check_job_status/{other_job_id}")
        output = resp.json()
        last_updated = output.pop("last_updated")
        assert output == {
            "id": other_job_id,
            "status": "not found",
        }
        assert last_updated is None

    def test_submitted_job_failed(self, client, registry, monkeypatch):
        # monkeypatch uuid4 to return a known value
        job_id = "abc1234"
        monkeypatch.setattr("uuid.uuid4", lambda: SimpleNamespace(hex=job_id))
        client.post("/submit", json={"author": "ben", "content": "this is a test"})
        # patch gistillery.worker._process_job to raise an exception

        def raise_(ex):
            raise ex

        # make the job processing fail
        monkeypatch.setattr(
            "gistillery.worker._process_job",
            lambda job, registry: raise_(RuntimeError("something went wrong")),
        )
        self.process_jobs(registry)

        resp = client.get(f"/check_job_status/{job_id}")
        output = resp.json()
        output.pop("last_updated")
        assert output == {
            "id": job_id,
            "status": "failed",
        }

    def test_submitted_job_status_done(self, client, registry, monkeypatch):
        # monkeypatch uuid4 to return a known value
        job_id = "abc1234"
        monkeypatch.setattr("uuid.uuid4", lambda: SimpleNamespace(hex=job_id))
        client.post("/submit", json={"author": "ben", "content": "this is a test"})
        self.process_jobs(registry)

        resp = client.get(f"/check_job_status/{job_id}")
        output = resp.json()
        last_updated = output.pop("last_updated")
        assert output == {
            "id": job_id,
            "status": "done",
        }
        assert is_roughly_now(last_updated)

    def test_status_pending_jobs(self, client, registry, monkeypatch):
        resp = client.get("/check_job_status/")
        output = resp.json()
        assert output == "No pending jobs found"

        monkeypatch.setattr("uuid.uuid4", lambda: SimpleNamespace(hex="abc0"))
        client.post("/submit", json={"author": "ben", "content": "this is a test"})
        resp = client.get("/check_job_status/")
        output = resp.json()
        expected = "Found 1 pending job(s): abc0"
        assert output == expected

        for i in range(1, 10):
            monkeypatch.setattr("uuid.uuid4", lambda: SimpleNamespace(hex=f"abc{i}"))
            client.post("/submit", json={"author": "ben", "content": "this is a test"})

        resp = client.get("/check_job_status/")
        output = resp.json()
        expected = "Found 10 pending job(s): abc0, abc1, abc2, ..."
        assert output == expected

    def test_recent_with_entries(self, client, registry):
        # submit 2 entries
        client.post(
            "/submit", json={"author": "maxi", "content": "this is a first test"}
        )
        client.post(
            "/submit",
            json={"author": "mini", "content": "this would be something else"},
        )
        self.process_jobs(registry)
        resp = client.get("/recent").json()

        # results are sorted by recency but since dummy models are so fast, the
        # date in the db could be the same, so we sort by author
        resp = sorted(resp, key=lambda x: x["author"])
        assert len(resp) == 2

        resp0 = resp[0]
        assert resp0["author"] == "maxi"
        assert resp0["summary"] == "this is a "
        assert resp0["tags"] == sorted(["#this", "#is", "#a"])

        resp1 = resp[1]
        assert resp1["author"] == "mini"
        assert resp1["summary"] == "this would"
        assert resp1["tags"] == sorted(["#this", "#would", "#be"])

    def test_recent_tag_with_entries(self, client, registry):
        # submit 2 entries
        client.post(
            "/submit", json={"author": "maxi", "content": "this is a first test"}
        )
        client.post(
            "/submit",
            json={"author": "mini", "content": "this would be something else"},
        )
        self.process_jobs(registry)

        # the "this" tag is in both entries
        resp = client.get("/recent/this").json()
        assert len(resp) == 2

        # the "would" tag is in only one entry
        resp = client.get("/recent/would").json()
        assert len(resp) == 1

        resp0 = resp[0]
        assert resp0["author"] == "mini"
        assert resp0["summary"] == "this would"
        assert resp0["tags"] == sorted(["#this", "#would", "#be"])

    def test_clear(self, client, cursor, registry):
        client.post("/submit", json={"author": "ben", "content": "this is a test"})
        self.process_jobs(registry)
        assert cursor.execute("SELECT COUNT(*) c FROM entries").fetchone()[0] == 1

        client.get("/clear")
        assert cursor.execute("SELECT COUNT(*) c FROM entries").fetchone()[0] == 0

    def test_inputs_stored(self, client, cursor, registry):
        client.post("/submit", json={"author": "ben", "content": "  this is a test\n"})
        self.process_jobs(registry)
        rows = cursor.execute("SELECT * FROM inputs").fetchall()
        assert len(rows) == 1
        assert rows[0].input == "this is a test"

    def test_submit_url(self, client, cursor, registry, monkeypatch):
        class MockClient:
            """Mock httpx Client, return www.example.com content"""

            def get(self, url):
                return SimpleNamespace(
                    text=''' <!doctype html>\n<html>\n<head>\n <title>Example
                    Domain</title>\n\n <meta charset="utf-8" />\n <meta
                    http-equiv="Content-type" content="text/html; charset=utf-8"
                    />\n <meta name="viewport" content="width=device-width,
                    initial-scale=1" />\n <style type="text/css">\n body {\n
                    background-color: #f0f0f2;\n margin: 0;\n padding: 0;\n
                    font-family: -apple-system, system-ui, BlinkMacSystemFont,
                    "Segoe UI", "Open Sans", "Helvetica Neue", Helvetica, Arial,
                    sans-serif;\n \n }\n div {\n width: 600px;\n margin: 5em
                    auto;\n padding: 2em;\n background-color: #fdfdff;\n
                    border-radius: 0.5em;\n box-shadow: 2px 3px 7px 2px
                    rgba(0,0,0,0.02);\n }\n a:link, a:visited {\n color:
                    #38488f;\n text-decoration: none;\n }\n @media (max-width:
                    700px) {\n div {\n margin: 0 auto;\n width: auto;\n }\n }\n
                    </style> \n</head>\n\n<body>\n<div>\n <h1>Example
                    Domain</h1>\n <p>This domain is for use in illustrative
                    examples in documents. You may use this\n domain in
                    literature without prior coordination or asking for
                    permission.</p>\n <p><a
                    href="https://www.iana.org/domains/example">More
                    information...</a></p>\n</div>\n</body>\n</html>\n'''
                )

        monkeypatch.setattr("gistillery.preprocessing.Client", MockClient)

        from gistillery.preprocessing import DefaultUrlProcessor

        # register url processor, put it before the default processor
        registry.register_processor(DefaultUrlProcessor(), last=False)
        client.post(
            "/submit",
            json={
                "author": "ben",
                "content": "https://en.wikipedia.org/wiki/non-existing-page",
            },
        )
        self.process_jobs(registry)

        rows = cursor.execute("SELECT * FROM inputs").fetchall()
        assert len(rows) == 1

        expected = "\n".join(
            [
                'https://en.wikipedia.org/wiki/non-existing-page',
                '',
                'This domain is for use in illustrative',
                'examples in documents. You may use this',
                'domain in',
                'literature without prior coordination or asking for',
                'permission.',
                'More',
                'information...',
            ]
        )
        assert rows[0].input == expected

    def test_backup(self, client, tmp_path):
        # submit an entry, create a backup, check that the backup contains the entry
        from gistillery.db import namedtuple_factory

        client.post("/submit", json={"author": "Pie Test", "content": "this is a pie"})
        resp = client.get("/backup")
        assert resp.status_code == 200

        with open(tmp_path / "backup.db", "wb") as f:
            f.write(resp.content)
            conn = sqlite3.connect(tmp_path / "backup.db")

        conn.row_factory = namedtuple_factory
        cursor = conn.cursor()
        res = cursor.execute("select * from entries").fetchall()
        assert len(res) == 1
        assert is_roughly_now(res[0].created_at)
        assert res[0].author == "Pie Test"