#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""Build a Panel Analysis page-spec JSON with NO Revit running.

    python tools/pa_pagespec.py
    python tools/pa_pagespec.py --reads reads.json --out spec.json
    python tools/pa_pagespec.py --reads reads.json --job-root JOBDIR

This is the CPython half of the owner's scope note on the HTML-page
rewrite: the front end (前端) must open and run before Revit ever supplies a
value, Revit only supplies PREFILL. `vibe.pa_pagespec.build_pagespec()` is
already Revit-free (see that module's own docstring); this script is what
gets `values` / `know` in front of it the same way `tools/deckcheck.py` gets
knowledge in front of its own checks -- off a live `doc`, on host CPython.

`--reads` is a JSON file shaped like whatever `PanelAnalysis.pushbutton`'s
`_reads_for()` hands `panelanalysisform.prefill()` -- the exact file a
bridge dry-run should save (see `_scratch/pa_pagespec_dump.py`, which writes
`_scratch/pa_reads_wpa655.json` for this purpose) or a hand-written stand-in
for testing the page with no model at all. Omitted, or pointed at a file
that is not there, this runs with `reads = {}` -- an EMPTY, but still
complete and defaulted, form (see `pa_pagespec.build_pagespec`'s "THE TWO
CALLING SHAPES" note): every field present, every `pa_defaults` rule
applied, every table at its minimum row count, every drawing's geometry
degraded to a placeholder rather than missing. That is the shape the HTML
page needs to be developable and testable in a browser with no Revit and no
model at all.

`--job-root` names the folder holding a job's OWN `knowledge.yaml` (see
`tools/deckcheck.py`'s `build_knowledge()` docstring for exactly what that
resolves) -- omitted, this runs with just the shipped defaults + catalogue
layers, same as `deckcheck.build_knowledge(None)`.

`--out` writes the spec there (UTF-8); omitted, it prints to stdout.

CONSTRAINTS THIS RESPECTS (same as `tools/deckcheck.py`, for the same
reason): host CPython, no Revit, standalone; prints no plant or client name
of its own -- design numbers and marks flowing through a `--reads` file are
data, not this file's business, per CLAUDE.md's "No client or job
information in the repo".
"""
from __future__ import print_function

import argparse
import io
import json
import os
import sys
import types

HERE = os.path.dirname(os.path.abspath(__file__))
REPO = os.path.abspath(os.path.join(HERE, os.pardir))
LIB = os.path.join(REPO, 'WillTools.extension', 'lib')
if LIB not in sys.path:
    sys.path.insert(0, LIB)

# Same trick `tools/deckcheck.py` / `tools/ticket_delta.py` /
# `WillTools.extension/tests/conftest.py` all use: `vibe/__init__.py`
# imports the Revit API at module scope, which is fatal off Revit. Register
# a bare `vibe` package pointed at the directory so the Revit-free
# submodules (`panelanalysisform`, `pa_pagespec`, the five page modules, the
# four `pa_sketch_*` modules, `pa_defaults`) import normally and
# `__init__.py` never runs.
if 'vibe' not in sys.modules:
    _stub = types.ModuleType('vibe')
    _stub.__path__ = [os.path.join(LIB, 'vibe')]
    sys.modules['vibe'] = _stub

if HERE not in sys.path:
    sys.path.insert(0, HERE)

import deckcheck  # noqa: E402  -- reuses build_knowledge(), not re-derived
from vibe import pa_pagespec  # noqa: E402
from vibe import panelanalysisform as F  # noqa: E402


def _load_reads(path):
    """`(reads_dict, error_or_None)`. A path that is not given, or not
    there, is the ordinary "no Revit at all" case -- `{}`, no error. A path
    that IS there and will not parse as a JSON object is reported, never
    silently treated as empty (the same "a layer that fails to load must
    never look like a layer that agrees" discipline `knowledge._merge_file`
    uses)."""
    if not path:
        return {}, None
    if not os.path.isfile(path):
        return {}, "'{0}' does not exist; running with reads = {{}}.".format(
            path)
    try:
        with io.open(path, 'r', encoding='utf-8') as fh:
            data = json.load(fh)
    except Exception as exc:
        return {}, "'{0}' could not be read as JSON ({1!r}); running with " \
            'reads = {{}}.'.format(path, exc)
    if not isinstance(data, dict):
        return {}, "'{0}' is not a JSON object; running with reads = {{}}." \
            .format(path)
    return data, None


def main(argv=None):
    parser = argparse.ArgumentParser(description=__doc__.splitlines()[0])
    parser.add_argument('--reads', default=None,
                        help='JSON file of the model reads dict (omit for '
                             'an empty, still-complete form)')
    parser.add_argument('--job-root', default=None,
                        help="folder holding the job's own knowledge.yaml "
                             '(omit for shipped defaults + catalogue only)')
    parser.add_argument('--out', default=None,
                        help='write the spec here (UTF-8); omit to print '
                             'to stdout')
    args = parser.parse_args(argv)

    reads, reads_err = _load_reads(args.reads)
    if reads_err:
        sys.stderr.write(reads_err + '\n')

    try:
        know = deckcheck.build_knowledge(args.job_root)
    except Exception as exc:
        sys.stderr.write(
            'knowledge could not be resolved off Revit ({0!r}); running '
            'with the bare shipped defaults.\n'.format(exc))
        know = {}

    values = F.prefill(reads, know=know)
    spec = pa_pagespec.build_pagespec(values, know=know, reads=reads)
    blob = pa_pagespec.dumps(spec)

    if args.out:
        with io.open(args.out, 'w', encoding='utf-8') as fh:
            fh.write(blob if isinstance(blob, str) else blob.decode('utf-8'))
        sys.stderr.write('wrote {0} ({1} bytes)\n'.format(
            args.out, len(blob)))
    else:
        print(blob)
    return 0


if __name__ == '__main__':
    raise SystemExit(main())