import json
from datetime import date
from pathlib import Path
from journal_bot.process import process_once
from journal_bot.queue import Queue, QueueItem
from journal_bot.processor_protocol import ProcessorOutput
from journal_bot.vault_writer import VaultWriter


class FakeProcessor:
    def __init__(self, output: ProcessorOutput | None = None, healthy=True, raises=None):
        self._output = output
        self._healthy = healthy
        self._raises = raises

    def health_check(self):
        return self._healthy

    def process(self, payload):
        if self._raises:
            raise self._raises
        return self._output


class CapturingProcessor:
    """Records the payload it was asked to process and echoes today as target."""
    def __init__(self):
        self.payload = None

    def health_check(self):
        return True

    def process(self, payload):
        self.payload = payload
        return ProcessorOutput(
            target_date=payload.today,
            target_path=f"05 Daily Notes/{payload.today}.md",
            entry_markdown=f"## {payload.received_time}\n{payload.text}",
        )


def make_item(update_id=1, text="Hallo"):
    return QueueItem(
        update_id=update_id,
        received_at="2026-06-14T14:32:17+02:00",
        type="text",
        text=text,
    )


def test_process_writes_to_vault_and_completes(tmp_path):
    vault = tmp_path / "vault"
    (vault / "05 Daily Notes").mkdir(parents=True)
    queue = Queue(tmp_path / "q")
    queue.enqueue(make_item(1))
    processor = FakeProcessor(ProcessorOutput(
        target_date="2026-06-14",
        target_path="05 Daily Notes/2026-06-14.md",
        entry_markdown="## 14:32\nHallo",
    ))
    writer = VaultWriter(vault)
    n = process_once(processor, queue, writer, vault_path=vault, today=date(2026, 6, 14), processed_at="2026-06-14T15:00:00+02:00")
    assert n == 1
    assert (tmp_path / "q" / "done" / "1.json").exists()
    assert (vault / "05 Daily Notes" / "2026-06-14.md").exists()


def test_process_skips_when_unhealthy(tmp_path):
    vault = tmp_path / "vault"
    (vault / "05 Daily Notes").mkdir(parents=True)
    queue = Queue(tmp_path / "q")
    queue.enqueue(make_item(1))
    processor = FakeProcessor(healthy=False)
    writer = VaultWriter(vault)
    n = process_once(processor, queue, writer, vault_path=vault, today=date(2026, 6, 14), processed_at="2026-06-14T15:00:00+02:00")
    assert n == 0
    assert (tmp_path / "q" / "pending" / "1.json").exists()


def test_process_fails_item_on_error(tmp_path):
    vault = tmp_path / "vault"
    (vault / "05 Daily Notes").mkdir(parents=True)
    queue = Queue(tmp_path / "q")
    queue.enqueue(make_item(1))
    processor = FakeProcessor(raises=RuntimeError("boom"))
    writer = VaultWriter(vault)
    process_once(processor, queue, writer, vault_path=vault, today=date(2026, 6, 14), processed_at="2026-06-14T15:00:00+02:00")
    assert (tmp_path / "q" / "pending" / "1.json").exists()
    import json
    data = json.loads((tmp_path / "q" / "pending" / "1.json").read_text(encoding="utf-8"))
    assert data["attempts"] == 1


def test_target_date_follows_send_day_not_processing_day(tmp_path):
    # Message sent yesterday (2026-06-25), processed today (2026-06-26).
    # The daily note must be the send day, not the processing day.
    vault = tmp_path / "vault"
    (vault / "05 Daily Notes").mkdir(parents=True)
    queue = Queue(tmp_path / "q")
    item = QueueItem(
        update_id=1,
        received_at="2026-06-25T08:13:42+02:00",
        type="text",
        text="Neue Charge Kefir angesetzt",
    )
    queue.enqueue(item)
    processor = CapturingProcessor()
    writer = VaultWriter(vault)
    process_once(
        processor, queue, writer,
        vault_path=vault,
        today=date(2026, 6, 26),  # processing day differs from send day
        processed_at="2026-06-26T06:55:22+02:00",
    )
    # The processor must have been told today = the send day, with matching weekday.
    assert processor.payload.today == "2026-06-25"
    assert processor.payload.weekday == "Donnerstag"  # 2026-06-25 is a Thursday
    # And the entry landed in the send-day note.
    data = json.loads((tmp_path / "q" / "done" / "1.json").read_text(encoding="utf-8"))
    assert data["target_path"] == "05 Daily Notes/2026-06-25.md"


def test_process_records_result_fields(tmp_path):
    vault = tmp_path / "vault"
    (vault / "05 Daily Notes").mkdir(parents=True)
    queue = Queue(tmp_path / "q")
    queue.enqueue(make_item(1))
    processor = FakeProcessor(ProcessorOutput(
        target_date="2026-06-14",
        target_path="05 Daily Notes/2026-06-14.md",
        entry_markdown="## 14:32\nHallo",
    ))
    writer = VaultWriter(vault)
    process_once(
        processor, queue, writer,
        vault_path=vault, today=date(2026, 6, 14),
        processed_at="2026-06-14T15:00:00+02:00",
    )
    data = json.loads(
        (tmp_path / "q" / "done" / "1.json").read_text(encoding="utf-8")
    )
    assert data["target_path"] == "05 Daily Notes/2026-06-14.md"
    assert data["written_entry"] == "## 14:32\nHallo"
    assert data["processed_at"] == "2026-06-14T15:00:00+02:00"