"""
Catalogs the non-table Access objects (Queries, Forms, Reports) via DAO COM
automation (win32com), since ODBC only exposes Tables and a subset of
non-hidden SELECT queries (as "VIEW"). DAO exposes everything, including:
  - QueryDefs: every saved query, with full .SQL text (this is where a lot
    of the business logic actually lives - billing calculations, renewal
    schedules, report data sources)
  - Containers("Reports").Documents: every saved Report object (name only -
    DAO's catalog interface doesn't expose RecordSource/layout; that needs
    the full Access.Application object model, which isn't available without
    MS Access itself installed)
  - Containers("Forms").Documents: every saved Form object (name only, same
    limitation)

Requires: pywin32 (`pip install pywin32`) and the Access Database Engine
(same requirement as everything else in migration/ - Windows only).

Usage:
    python catalog_objects.py --output objects.json
"""

from __future__ import annotations

import argparse
import json
from pathlib import Path

import win32com.client

from config import SOURCE_ROOT

HIDDEN_QUERY_PREFIXES = ("~sq_", "~TMP")

# Unlike config.SOURCES (which points "seguros" at the _be data file), the
# Queries/Forms/Reports objects live in the linked *frontend* files - the
# _be backend is pure data storage. Both SEGUROS files are catalogued here
# since either could theoretically hold saved objects.
OBJECT_SOURCES = {
    "utilities": SOURCE_ROOT / "UTILITIES.accdb",
    "seguros_frontend": SOURCE_ROOT / "SEGUROS 16.mdb",
    "seguros_backend": SOURCE_ROOT / "SEGUROS 16_be.mdb",
    "scothia": SOURCE_ROOT / "SCOTHIA.mdb",
}


def catalog_source(path: Path) -> dict:
    engine = win32com.client.Dispatch("DAO.DBEngine.120")
    db = engine.OpenDatabase(str(path))

    queries = []
    for i in range(db.QueryDefs.Count):
        qd = db.QueryDefs(i)
        name = qd.Name
        is_hidden = name.startswith(HIDDEN_QUERY_PREFIXES)
        try:
            sql = qd.SQL
        except Exception as exc:  # noqa: BLE001
            sql = f"<could not read SQL: {exc}>"
        try:
            query_type = qd.Type  # 0=Select, 32=CrossTab, 48=Delete, 64=Update, 80=Append, 96=MakeTable, 112=DDL, 128=PassThrough, 144=SPTBulk, 160=SetOperation, 176=Procedure
        except Exception:
            query_type = None
        queries.append({"name": name, "hidden": is_hidden, "sql": sql, "type": query_type})

    def list_container(container_name: str) -> list[str]:
        container = db.Containers(container_name)
        names = []
        for i in range(container.Documents.Count):
            names.append(container.Documents(i).Name)
        return sorted(names)

    reports = list_container("Reports")
    forms = list_container("Forms")

    db.Close()

    return {
        "query_count": len(queries),
        "queries": queries,
        "report_count": len(reports),
        "reports": reports,
        "form_count": len(forms),
        "forms": forms,
    }


def main() -> None:
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument("--output", type=Path, default=Path("objects.json"))
    args = parser.parse_args()

    catalog = {}
    for source_name, path in OBJECT_SOURCES.items():
        print(f"Cataloging objects in {source_name} ({path})...")
        if not Path(path).exists():
            print(f"  [skip] not found")
            continue
        catalog[source_name] = catalog_source(path)
        c = catalog[source_name]
        print(f"  queries={c['query_count']} reports={c['report_count']} forms={c['form_count']}")

    args.output.write_text(json.dumps(catalog, indent=2, default=str), encoding="utf-8")
    print(f"Wrote {args.output}")


if __name__ == "__main__":
    main()