#!/usr/bin/env python3
"""Build Deepgrain Foundry into one self-contained HTML file.

The source files listed in src/manifest.json are joined in order (sim first, then the browser
code) into one classic script, so they share one global scope and 'use strict' at the top of
src/sim/base.js applies to all of it. No bundler, no dependencies.

Writes:
  dist/index.html             the full page: open it, or serve dist/ with python -m http.server
  dist/deepgrain-foundry.html the same without <!doctype>/<head>/<body>, for hosts (like a
                              claude.ai artifact) that wrap the page themselves
  dist/bundle-lines.json      where each source file starts in dist/index.html, so a line number
                              from a browser error can be traced back: python3 tools/where.py LINE
"""
import json, pathlib

root = pathlib.Path(__file__).resolve().parent
src = root / 'src'
dist = root / 'dist'
man = json.loads((src / 'manifest.json').read_text())


def join(files):
    """Join files with one newline between them; return the text and [first line, file] pairs."""
    parts, starts, line = [], [], 1
    for f in files:
        text = (src / f).read_text().rstrip('\n')
        starts.append([line, f])
        parts.append(text)
        line += text.count('\n') + 1
    return '\n'.join(parts), starts


def main():
    shell = (src / man['shell']).read_text()
    css, _ = join(man['css'])
    js, starts = join(man['sim'] + man['client'])
    head, tail = shell.split('//__JS__')
    body = head.replace('/*__CSS__*/', css)
    page = body + js + tail
    pre = ('<!doctype html><html><head><meta charset="utf-8">'
           '<meta name="viewport" content="width=device-width,initial-scale=1,viewport-fit=cover">'
           '</head><body>')
    full = pre + page + '</body></html>\n'
    dist.mkdir(exist_ok=True)
    (dist / 'deepgrain-foundry.html').write_text(page)
    (dist / 'index.html').write_text(full)
    # the script starts on this line of index.html (the doctype prefix has no newlines)
    js_line = body.count('\n') + 1
    (dist / 'bundle-lines.json').write_text(json.dumps(
        {'page': 'dist/index.html', 'files': [[js_line + s - 1, f] for s, f in starts]}, indent=1) + '\n')
    print(f'built dist/index.html ({len(full):,} bytes, {len(starts)} source files)')


if __name__ == '__main__':
    main()