"""Synthetic acceptance workflow for the complete local MVP."""

import json
from contextlib import contextmanager
from decimal import Decimal
from pathlib import Path
from types import SimpleNamespace
from zipfile import ZipFile

import pytest
from django.test import Client
from django.urls import reverse

from core.backup import (
    DatabaseSnapshot,
    DatabaseTarget,
    create_backup,
    verify_backup,
)
from finance.exports import build_export
from finance.models import SourceRecord, Transaction
from finance.services import Actor, create_account, create_category
from ingestion import services as import_services


pytestmark = pytest.mark.django_db(transaction=True)
ACTOR = Actor(kind="AGENT", identifier="synthetic-mvp-acceptance")
FIXTURE = Path("tests/fixtures/synthetic/ingestion/bank.csv")


def test_synthetic_import_to_report_export_and_backup_workflow(
    tmp_path, settings, monkeypatch
):
    account = create_account(
        name="Synthetic acceptance bank",
        kind="BANK",
        currency="BRL",
        actor=ACTOR,
    )
    category = create_category(
        name="Synthetic acceptance spending",
        kind="EXPENSE",
        actor=ACTOR,
    )
    batch = import_services.create_preview(
        data=FIXTURE.read_bytes(),
        profile="BANK_CSV_V1",
        section_mapping={"1": str(account.pk)},
        actor=ACTOR,
    )
    assert Transaction.objects.count() == 0

    decisions = [
        {"locator": item.locator, "action": "CREATE"}
        for item in batch.items.order_by("locator")
    ]
    batch = import_services.apply_decisions(
        batch_id=batch.pk,
        revision=batch.revision,
        decisions=decisions,
        actor=ACTOR,
    )
    batch = import_services.commit_preview(
        batch_id=batch.pk,
        revision=batch.revision,
        actor=ACTOR,
    )
    assert batch.result["created"] == 2
    assert Transaction.objects.count() == SourceRecord.objects.count() == 2

    expense = Transaction.objects.get(kind=Transaction.Kind.EXPENSE)
    browser = Client(enforce_csrf_checks=True)
    form = browser.get(reverse("transaction-annotate", args=[expense.pk]))
    csrf_token = form.cookies["csrftoken"].value
    response = browser.post(
        reverse("transaction-annotate", args=[expense.pk]),
        {
            "csrfmiddlewaretoken": csrf_token,
            "description": expense.description,
            "payee": "",
            "category": str(category.pk),
        },
    )
    assert response.status_code == 302
    expense.refresh_from_db()
    assert expense.category_id == category.pk

    report = browser.get(
        reverse("monthly-report"),
        {"month": "2026-02", "currency": "BRL"},
    )
    assert report.status_code == 200
    assert report.context["summary"].inflow == Decimal("100.00")
    assert report.context["summary"].expense == Decimal("12.34")
    assert report.context["summary"].net_activity == Decimal("87.66")
    assert report.context["spending_rows"][0].category_name == category.name

    export = build_export()
    export_path = tmp_path / export.filename
    export_path.write_bytes(export.content)
    with ZipFile(export_path) as archive:
        manifest = json.loads(archive.read("manifest.json"))
        assert manifest["format"] == "gizmoduck-export"
        assert manifest["files"]["transactions.csv"]["rows"] == 2
        assert manifest["files"]["source_records.csv"]["rows"] == 2
        assert category.name.encode() in archive.read("categories.csv")

    settings.BACKUP_ROOT = tmp_path
    settings.BACKUP_VERIFY_ALLOWED = True
    snapshot = DatabaseSnapshot(
        migrations=(("finance", "0001_initial"), ("ingestion", "0001_initial")),
        row_counts={"finance_transaction": 2, "finance_sourcerecord": 2},
    )

    @contextmanager
    def exported_snapshot(_target):
        yield "synthetic-mvp-snapshot", snapshot

    class Runner:
        def __init__(self):
            self.calls = []

        def __call__(self, argv, **kwargs):
            self.calls.append(list(argv))
            if argv[0] == "pg_dump" and argv != ["pg_dump", "--version"]:
                dump_name = next(
                    value.removeprefix("--file=")
                    for value in argv
                    if value.startswith("--file=")
                )
                Path(dump_name).write_bytes(b"PGDMP synthetic acceptance")
            return SimpleNamespace(stdout=b"pg_dump (PostgreSQL) 17.6\n")

    monkeypatch.setattr("core.backup._exported_snapshot", exported_snapshot)
    backup_runner = Runner()
    backup = create_backup("synthetic-mvp.dump", runner=backup_runner)
    assert any(call[0] == "pg_dump" for call in backup_runner.calls)
    assert json.loads(backup.manifest_path.read_text(encoding="utf-8"))[
        "row_counts"
    ] == snapshot.row_counts

    target = DatabaseTarget(
        host="restore-db",
        port="5432",
        name="gizmoduck_restore",
        user="gizmoduck_restore",
        password="synthetic-restore-password",
    )
    observed = iter(
        [
            DatabaseSnapshot(migrations=(), row_counts={}),
            snapshot,
        ]
    )
    monkeypatch.setattr("core.backup._read_snapshot", lambda _target: next(observed))
    restore_runner = Runner()
    result = verify_backup(backup.name, target, runner=restore_runner)

    assert result.row_counts == snapshot.row_counts
    assert restore_runner.calls[0][0] == "pg_restore"
    assert "--single-transaction" in restore_runner.calls[0]