#!/usr/bin/env python3
"""Serve a Vite SPA + proxy /pb to PocketBase. Generic, reusable."""
from http.server import HTTPServer, SimpleHTTPRequestHandler
import urllib.request
import os

DIST = os.environ.get('SPQ_DIST', './dist')
PB = os.environ.get('PB_URL', 'http://127.0.0.1:8091')

class Handler(SimpleHTTPRequestHandler):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, directory=DIST, **kwargs)

    def end_headers(self):
        self.send_header('Access-Control-Allow-Origin', '*')
        self.send_header('Access-Control-Allow-Methods', 'GET, POST, PUT, PATCH, DELETE, OPTIONS')
        self.send_header('Access-Control-Allow-Headers', 'Authorization, Content-Type')
        super().end_headers()

    def do_OPTIONS(self):
        self.send_response(204)
        self.end_headers()

    def do_GET(self):
        if self.path.startswith('/pb') or self.path.startswith('/api'):
            self.proxy()
        else:
            full = os.path.join(DIST, self.path.lstrip('/'))
            if not os.path.exists(full) or (os.path.isdir(full) and self.path != '/'):
                self.path = '/index.html'
            super().do_GET()

    def do_POST(self):
        if self.path.startswith('/pb') or self.path.startswith('/api'):
            self.proxy()
        else:
            self.send_error(405)

    def do_PUT(self): self.proxy()
    def do_PATCH(self): self.proxy()
    def do_DELETE(self): self.proxy()

    def proxy(self):
        # PB SDK calls /pb/api/collections/... — path already includes /api/
        url = PB + self.path
        if self.path.startswith('/pb'):
            url = PB + self.path[3:]  # strip /pb prefix
            if not url.startswith(PB + '/api'):
                url = PB + '/api' + self.path[3:]
        body = None
        if self.headers.get('Content-Length'):
            body = self.rfile.read(int(self.headers['Content-Length']))
        req = urllib.request.Request(url, data=body, method=self.command)
        for k, v in self.headers.items():
            if k.lower() not in ('host', 'connection', 'origin', 'referer'):
                req.add_header(k, v)
        try:
            resp = urllib.request.urlopen(req)
            self.send_response(resp.status)
            for k, v in resp.headers.items():
                if k.lower() not in ('transfer-encoding', 'connection'):
                    self.send_header(k, v)
            self.end_headers()
            self.wfile.write(resp.read())
        except urllib.error.HTTPError as e:
            self.send_response(e.code)
            self.end_headers()
            self.wfile.write(e.read())

if __name__ == '__main__':
    server = HTTPServer(('0.0.0.0', 4173), Handler)
    print(f'Serving {DIST} on 0.0.0.0:4173 (PB → {PB})')
    server.serve_forever()