#!/usr/bin/env python3
"""Generate the site's read-only service catalog from the API's single source.

Source : api/src/service-catalog.ts  (COMPLIANCE_SERVICES -- the authority)
Output : site/src/lib/service-catalog.generated.ts  (SERVICE_META for display)

Run host-side before the site build (deploy.sh / site prebuild). The prod box
has python3 but not node, so this is Python (matches scripts/sync_nav.py). Never
edit the generated file by hand: to change a price/name, edit the API catalog.

The catalog is a static TS object literal (string keys, number/bool/string
values, trailing commas, // comments). We parse it into Python dicts.
"""
import json
import re
from pathlib import Path

ROOT = Path(__file__).resolve().parent.parent
SRC = ROOT / "api/src/service-catalog.ts"
OUT = ROOT / "site/src/lib/service-catalog.generated.ts"


def _unescape(s: str) -> str:
    """Unescape only TS string escapes we expect (\\" and \\\\); the source is
    already UTF-8, so we must NOT unicode_escape-decode (that mangles e.g. -> / section sign)."""
    return s.replace('\\"', '"').replace("\\\\", "\\")


def parse_catalog(ts: str) -> dict:
    """Parse COMPLIANCE_SERVICES entries: name, price_cents, gov_fee_label."""
    m = re.search(r"export const COMPLIANCE_SERVICES[^=]*=\s*\{(.*)\n\};", ts, re.S)
    if not m:
        raise SystemExit("[gen-service-catalog] could not locate COMPLIANCE_SERVICES literal")
    body = m.group(1)
    out = {}
    # Each entry: "slug": { ... },  with the inner object possibly multi-line.
    for em in re.finditer(r'"([a-z0-9\-]+)":\s*\{(.*?)\}', body, re.S):
        slug = em.group(1)
        inner = em.group(2)
        name_m = re.search(r'name:\s*"((?:[^"\\]|\\.)*)"', inner)
        price_m = re.search(r"price_cents:\s*(\d+)", inner)
        gov_m = re.search(r'gov_fee_label:\s*"((?:[^"\\]|\\.)*)"', inner)
        interval_m = re.search(r'billing_interval:\s*"(month|year)"', inner)
        methods_m = re.search(r"allowed_methods:\s*\[([^\]]*)\]", inner)
        if not name_m or not price_m:
            continue
        entry = {
            "name": _unescape(name_m.group(1)),
            "price_cents": int(price_m.group(1)),
        }
        if gov_m:
            entry["gov_fee_label"] = _unescape(gov_m.group(1))
        if interval_m:
            entry["billing_interval"] = interval_m.group(1)
        if methods_m:
            entry["allowed_methods"] = re.findall(r'"([a-z]+)"', methods_m.group(1))
        out[slug] = entry
    return out


def render(catalog: dict) -> str:
    lines = []
    for slug in sorted(catalog):
        s = catalog[slug]
        parts = [f"name: {json.dumps(s["name"], ensure_ascii=False)}", f"price_cents: {s['price_cents']}"]
        if s.get("gov_fee_label"):
            parts.append(f"gov_fee_label: {json.dumps(s["gov_fee_label"], ensure_ascii=False)}")
        if s.get("billing_interval"):
            parts.append(f"billing_interval: {json.dumps(s['billing_interval'], ensure_ascii=False)}")
        if s.get("allowed_methods"):
            parts.append(f"allowed_methods: {json.dumps(s['allowed_methods'], ensure_ascii=False)}")
        lines.append(f"  {json.dumps(slug, ensure_ascii=False)}: {{ {', '.join(parts)} }},")
    return (
        "/**\n"
        " * AUTO-GENERATED -- DO NOT EDIT.\n"
        " *\n"
        " * Source of truth: api/src/service-catalog.ts (COMPLIANCE_SERVICES).\n"
        " * Regenerate with: python3 scripts/gen-service-catalog.py (runs on deploy).\n"
        " *\n"
        " * Display-only subset (name, price_cents, gov_fee_label) of the API catalog,\n"
        " * so the public site can never drift from what the API actually charges.\n"
        " */\n\n"
        "export interface ServiceMeta {\n"
        "  name: string;\n"
        "  price_cents: number;\n"
        "  gov_fee_label?: string;\n"
        '  billing_interval?: "month" | "year";\n'
        '  allowed_methods?: ("card" | "ach" | "paypal" | "klarna" | "crypto")[];\n'
        "}\n\n"
        "export const SERVICE_META: Record<string, ServiceMeta> = {\n"
        + "\n".join(lines)
        + "\n};\n"
    )


if __name__ == "__main__":
    catalog = parse_catalog(SRC.read_text())
    OUT.write_text(render(catalog))
    print(f"[gen-service-catalog] wrote {len(catalog)} services -> {OUT}")