#!/usr/bin/env python3
"""
embed_for_dist.py
─────────────────
Re-embeds edited source files back into Avaya_5952_setup.py
for single-file distribution to end users.

Run after editing source files:
    python embed_for_dist.py

This is the reverse of extract_for_dev.py.
"""

import re, sys, ast
from pathlib import Path

HERE  = Path(__file__).parent
SETUP = HERE / "Avaya_5952_setup.py"

if not SETUP.exists():
    print(f"Error: {SETUP} not found")
    sys.exit(1)

src = SETUP.read_text()

# ── Helper: replace a repr()-encoded constant ───────────────────────────────

def replace_repr(src, name, new_value):
    idx = src.find(f'\n{name} = ')
    if idx == -1:
        print(f"  Warning: {name} not found in setup script")
        return src
    start = idx + len(f'\n{name} = ')
    qc = src[start]
    end = start + 1
    while end < len(src):
        if src[end] == qc and src[end-1] != '\\':
            end += 1; break
        end += 1
    new_repr = repr(new_value)
    return src[:start] + new_repr + src[end:]

# ── Helper: replace a triple-quoted constant ────────────────────────────────

def replace_triple(src, name, new_value):
    pattern = rf'({name}\s*=\s*""").*?(""")'
    replacement = r'\g<1>' + new_value.replace('\\', '\\\\') + r'\g<2>'
    new_src = re.sub(pattern, replacement, src, flags=re.DOTALL)
    if new_src == src:
        print(f"  Warning: {name} not found or unchanged")
    return new_src

# ── Files to embed ───────────────────────────────────────────────────────────

embeddings = [
    # (embed_fn, source_filename, constant_name, note)
    (replace_repr,   'switch_backend.py',   'BACKEND_SRC',        "FastAPI backend"),
    (replace_repr,   'ers5952-manager.jsx', 'JSX_SRC',            "React frontend"),
    (replace_repr,   'README.md',           'README_SRC',         "Documentation"),
    (replace_triple, 'Dockerfile',          'DOCKERFILE',         "Docker image"),
    (replace_triple, 'docker-compose.yml',  'COMPOSE_YML',        "Docker Compose"),
]

print("Embedding source files into Avaya_5952_setup.py...\n")

updated = src
changed = []

for fn, fname, const, note in embeddings:
    fpath = HERE / fname
    if not fpath.exists():
        print(f"  ✗ {fname:<35} not found — skipping")
        continue
    content = fpath.read_text()
    new_src = fn(updated, const, content)
    if new_src != updated:
        updated = new_src
        changed.append(fname)
        print(f"  ✓ {fname:<35} {note}  ({len(content):,} chars)")
    else:
        print(f"  – {fname:<35} unchanged")

if not changed:
    print("\nNo changes — Avaya_5952_setup.py not modified")
    sys.exit(0)

# ── Validate syntax before writing ──────────────────────────────────────────

print("\nValidating Python syntax...")
try:
    ast.parse(updated)
    print("  ✓ Syntax OK")
except SyntaxError as e:
    print(f"  ✗ Syntax error at line {e.lineno}: {e.msg}")
    print("  Avaya_5952_setup.py NOT modified — fix the error first")
    sys.exit(1)

# ── Write ────────────────────────────────────────────────────────────────────

# Backup first
backup = SETUP.with_suffix('.py.bak')
backup.write_text(src)
print(f"  Backup saved to {backup.name}")

SETUP.write_text(updated)

import os
size = os.path.getsize(SETUP)
print(f"\n✓ Avaya_5952_setup.py updated ({size:,} bytes, {size//1024} KB)")
print(f"  {len(changed)} file(s) embedded: {', '.join(changed)}")
print("""
The updated Avaya_5952_setup.py is ready for distribution.
Test it: python Avaya_5952_setup.py
""")