from __future__ import annotations

import sqlite3

from jarca_ledger_mcp.application.account_valuation_service import (
    list_account_valuations,
    register_account_valuation,
)
from jarca_ledger_mcp.application.assets_service import (
    create_manual_asset,
    list_manual_assets,
    preview_asset_snapshot_close,
)
from jarca_ledger_mcp.application.settlement_draft_service import create_settlement_draft
from jarca_ledger_mcp.infrastructure.sqlite.migrations import init_db


def _tables(path):
    with sqlite3.connect(path) as conn:
        return {r[0] for r in conn.execute("select name from sqlite_master where type='table'")}


EXPECTED_TABLES = {
    # Sourced from schema.py plus migration-created settlement draft tables.
    "schema_meta",
    "accounts",
    "transactions",
    "budgets",
    "import_batches",
    "category_rules",
    "ledger_categories",

    "account_snapshot",
    "settlement_cashflow_snapshots",
    "review_decisions",
    "reconciliation_sessions",
    "monthly_settlement",
    "settlement_drafts",
    "settlement_draft_items",
}


def test_fresh_init_has_no_account_valuations_and_exact_schema_tables(tmp_path):
    path = tmp_path / "fresh.sqlite3"
    init_db(str(path))
    tables = _tables(path)
    assert "account_valuations" not in tables
    assert tables == EXPECTED_TABLES


def test_init_is_idempotent(tmp_path):
    path = tmp_path / "repeat.sqlite3"
    assert init_db(str(path)) == str(path)
    assert init_db(str(path)) == str(path)
    assert _tables(path) == EXPECTED_TABLES


def test_legacy_nonempty_account_valuations_row_is_dropped_only(tmp_path):
    path = tmp_path / "legacy.sqlite3"
    init_db(str(path))
    with sqlite3.connect(path) as conn:
        conn.execute("create table account_valuations (id text primary key, account_id text, amount integer)")
        conn.execute("insert into account_valuations values ('legacy-1','acct-1',123)")
        conn.execute("insert into accounts (id,name,type,active,created_at,updated_at) values ('acct-1','Keep me','bank',1,'t','t')")
        conn.commit()
    init_db(str(path))
    with sqlite3.connect(path) as conn:
        assert conn.execute("select count(*) from accounts where id='acct-1'").fetchone()[0] == 1
        assert conn.execute("select name from sqlite_master where type='table' and name='account_valuations'").fetchone() is None


def test_unsupported_valuation_operations_do_not_create_or_access_db(tmp_path):
    path = tmp_path / "must-not-exist.sqlite3"
    result = register_account_valuation("acct", "2026-09-30", 1, db_path=str(path))
    listed = list_account_valuations("acct", db_path=str(path))
    assert result["success"] is False and result["error_code"] == "validation_error"
    assert listed["success"] is False and listed["error_code"] == "db_error"
    assert not path.exists()


def test_active_account_preview_reports_missing_without_sql_error(tmp_path):
    path = tmp_path / "preview.sqlite3"
    init_db(str(path))
    with sqlite3.connect(path) as conn:
        conn.execute("insert into accounts (id,name,type,active,created_at,updated_at) values ('acct-1','Active','bank',1,'t','t')")
        conn.commit()
    result = preview_asset_snapshot_close("2026-09-30", db_path=str(path))
    assert result["success"] is True
    assert result["close_status"] in {"incomplete_draft", "complete_exact"}
    assert not any(w.get("code") == "db_error" for w in result["warnings"])


def test_active_account_draft_returns_review_blocker_without_sql_error(tmp_path):
    path = tmp_path / "draft.sqlite3"
    init_db(str(path))
    with sqlite3.connect(path) as conn:
        conn.execute("insert into accounts (id,name,type,active,created_at,updated_at) values ('acct-1','Active','bank',1,'t','t')")
        conn.commit()
    result = create_settlement_draft("2026-09", "tester", "draft-key", db_path=str(path))
    assert result["success"] is True
    assert result.get("review", {}).get("approval_required") is True
    assert not any("sql" in str(v).lower() for v in result.get("review", {}).values())


def test_manual_asset_flow_is_unsupported_after_removal(tmp_path):
    path = tmp_path / "manual.sqlite3"
    init_db(str(path))
    created = create_manual_asset("Emergency fund", 100000, "2026-09-30", "cash", db_path=str(path))
    listed = list_manual_assets(db_path=str(path))
    assert created == {"success": False, "error_code": "unsupported", "error": "manual assets are no longer supported"}
    assert listed == {"success": False, "error_code": "unsupported", "error": "manual assets are no longer supported"}