#!/usr/bin/env python3
"""Builds the small public plan maps used by the project popup.

Reads a site model's bushveld.json (road/paving areas grouped by section) and
writes src/data/sitemaps/<slug>.json: sections in build order, each with
simplified outline paths in a y-down viewBox. No levels, quantities or costs.
"""
import json, sys, pathlib

MODELS = pathlib.Path.home() / 'DEVELOPMENT/MEGAIFRASTRUCTURE/reports/site-models'
SOURCES = {
    'munyaka': MODELS / 'munyaka/2026-10-28/bushveld.json',
    'cedar-gate': MODELS / 'cedar-gate/2026-10-20/bushveld.json',
    # Only stored in the app's database; exported from the active site_models record.
    'the-hills': pathlib.Path(__file__).resolve().parent / 'source/hills-bushveld.json',
}
OUT = pathlib.Path(__file__).resolve().parent.parent / 'src/data/sitemaps'

def build(slug, src):
    d = json.load(open(src))
    order = [s['key'] for s in d['sections']]
    names = {s['key']: s.get('name') or f"Chainage {s['from']:g}-{s['to']:g} m" for s in d['sections']}
    rings = {k: [] for k in order}
    for a in d['areas']:
        if a['section'] in rings:
            rings[a['section']] += a['rings']
    pts = [p for rs in rings.values() for r in rs for p in r]
    x0, x1 = min(p[0] for p in pts), max(p[0] for p in pts)
    y0, y1 = min(p[1] for p in pts), max(p[1] for p in pts)
    pad = max(x1 - x0, y1 - y0) * 0.04
    w, h = x1 - x0 + 2 * pad, y1 - y0 + 2 * pad
    def path(ring):
        return 'M' + 'L'.join(f'{p[0]-x0+pad:.1f} {y1-p[1]+pad:.1f}' for p in ring[:-1]) + 'Z'
    sections = [
        {'key': k, 'name': names[k], 'd': ' '.join(path(r) for r in rings[k])}
        for k in order if rings[k]
    ]
    json.dump({'viewBox': [0, 0, round(w, 1), round(h, 1)], 'sections': sections},
              open(OUT / f'{slug}.json', 'w'), separators=(',', ':'))
    print(slug, len(sections), 'sections', round(w), 'x', round(h))

for slug, src in SOURCES.items():
    build(slug, src)