#!/usr/bin/env bash
set -euo pipefail

# Collect third-party license texts into LICENSES.md
# Usage: scripts/collect_licenses.sh [output-path]
#   output-path defaults to LICENSES.md at the repo root

REPO_ROOT="$(cd "$(dirname "$0")/.." && pwd)"
OUT="${1:-$REPO_ROOT/LICENSES.md}"

# ── Backend (Python) — uses pip-licenses ─────────────────────────────
backend_licenses() {
    cd "$REPO_ROOT"

    # Extract direct dependency names from pyproject.toml
    local packages
    packages=$(uv run python3 -c "
import re, tomllib
with open('pyproject.toml', 'rb') as f:
    deps = tomllib.load(f)['project']['dependencies']
names = [re.split(r'[\[><=!;]', d)[0].strip() for d in deps]
print(' '.join(names))
")

    # shellcheck disable=SC2086
    uv run pip-licenses \
        --packages $packages \
        --with-license-file \
        --no-license-path \
        --format=json \
    | uv run python3 -c "
import json, sys

data = sorted(json.load(sys.stdin), key=lambda d: d['Name'].lower())
for d in data:
    name    = d['Name']
    version = d['Version']
    lic     = d.get('License', 'Unknown')
    text    = d.get('LicenseText', '').strip()

    print(f'### {name} ({version}) — {lic}\n')
    if text and text != 'UNKNOWN':
        print('<details>')
        print('<summary>Full license text</summary>')
        print()
        print('\`\`\`')
        print(text)
        print('\`\`\`')
        print()
        print('</details>')
    else:
        print('*License file not found in package metadata.*')
    print()
"
}

# ── Frontend (npm) ───────────────────────────────────────────────────
frontend_licenses() {
    cd "$REPO_ROOT/frontend"

    node -e "
const fs = require('fs');
const path = require('path');

const pkg = JSON.parse(fs.readFileSync('package.json', 'utf8'));
const depNames = Object.keys(pkg.dependencies || {}).sort((a, b) =>
    a.toLowerCase().localeCompare(b.toLowerCase())
);

for (const name of depNames) {
    const pkgDir = path.join('node_modules', name);
    let version = 'unknown';
    let licenseType = 'Unknown';
    let licenseText = null;

    // Read package.json for version + license type
    try {
        const depPkg = JSON.parse(fs.readFileSync(path.join(pkgDir, 'package.json'), 'utf8'));
        version = depPkg.version || version;
        licenseType = depPkg.license || licenseType;
    } catch {}

    // Find license file (case-insensitive search)
    try {
        const files = fs.readdirSync(pkgDir);
        const licFile = files.find(f => /^(licen[sc]e|copying)/i.test(f));
        if (licFile) {
            licenseText = fs.readFileSync(path.join(pkgDir, licFile), 'utf8').trim();
        }
    } catch {}

    console.log('### ' + name + ' (' + version + ') — ' + licenseType + '\n');
    if (licenseText) {
        console.log('<details>');
        console.log('<summary>Full license text</summary>');
        console.log();
        console.log('\`\`\`');
        console.log(licenseText);
        console.log('\`\`\`');
        console.log();
        console.log('</details>');
    } else {
        console.log('*License file not found in package.*');
    }
    console.log();
}
"
}

# ── Assemble ─────────────────────────────────────────────────────────
{
    echo "# Third-Party Licenses"
    echo
    echo "Auto-generated by \`scripts/collect_licenses.sh\` — do not edit by hand."
    echo
    echo "## Backend (Python) Dependencies"
    echo
    backend_licenses
    echo "## Frontend (npm) Dependencies"
    echo
    frontend_licenses
} > "$OUT"

echo "Wrote $OUT" >&2