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"""Portable WebsiteBench Kanetix / Rates.ca desktop clone server."""

from __future__ import annotations

import json
import mimetypes
import os
import re
from datetime import UTC, datetime
from http.server import BaseHTTPRequestHandler, ThreadingHTTPServer
from pathlib import Path
from urllib.parse import parse_qs, unquote, urlsplit

from backend.site_backend_integration import open_site_services


SITE_ID = "kanetix-ca"
ROOT = Path(__file__).resolve().parent
PUBLIC = ROOT / "public"
DATA_DIR = Path(os.environ.get("DATA_DIR", str(ROOT.parent / "data"))).resolve()
DATA_DIR.mkdir(parents=True, exist_ok=True)
os.environ.setdefault("WEBSITEBENCH_SITE_BACKEND_DATABASE", str(DATA_DIR / f"{SITE_ID}.sqlite3"))
BACKEND, _AUTH = open_site_services()


def now() -> str:
    return datetime.now(UTC).isoformat().replace("+00:00", "Z")


def row_dict(row):
    return dict(row) if row is not None else None


def paginate(table: str, page: int, page_size: int, where: str = "", params=(), order: str = "id ASC"):
    offset = (page - 1) * page_size
    clause = f" WHERE {where}" if where else ""
    with BACKEND.lifecycle.connection() as connection:
        total = connection.execute(f"SELECT COUNT(*) AS count FROM {table}{clause}", params).fetchone()["count"]
        rows = connection.execute(
            f"SELECT * FROM {table}{clause} ORDER BY {order} LIMIT ? OFFSET ?",
            (*params, page_size, offset),
        ).fetchall()
    return {
        "items": [dict(row) for row in rows], "page": page, "page_size": page_size,
        "total": total, "pages": max(1, (total + page_size - 1) // page_size),
    }


class Handler(BaseHTTPRequestHandler):
    server_version = "WebsiteBenchKanetix/1.0"

    def log_message(self, _format, *_args):
        return

    def send_json(self, status: int, value) -> None:
        body = json.dumps(value, ensure_ascii=False).encode()
        self.send_response(status)
        self.send_header("Content-Type", "application/json; charset=utf-8")
        self.send_header("Content-Length", str(len(body)))
        self.send_header("Cache-Control", "no-store")
        self.end_headers()
        self.wfile.write(body)

    def read_json(self):
        length = int(self.headers.get("Content-Length", "0"))
        if length > 1_000_000:
            raise ValueError("Payload too large")
        try:
            return json.loads(self.rfile.read(length) or b"{}")
        except json.JSONDecodeError as exc:
            raise ValueError("Invalid JSON") from exc

    def serve_file(self, path: Path) -> bool:
        try:
            resolved = path.resolve(strict=True)
            resolved.relative_to(PUBLIC)
        except (FileNotFoundError, ValueError):
            return False
        if not resolved.is_file():
            return False
        body = resolved.read_bytes()
        content_type = mimetypes.guess_type(str(resolved))[0] or "application/octet-stream"
        self.send_response(200)
        self.send_header("Content-Type", content_type + ("; charset=utf-8" if content_type.startswith("text/") else ""))
        self.send_header("Content-Length", str(len(body)))
        self.send_header("Cache-Control", "no-cache")
        self.end_headers()
        self.wfile.write(body)
        return True

    def do_GET(self):
        parsed = urlsplit(self.path)
        path = parsed.path
        query = parse_qs(parsed.query)
        if path in {"/api/healthz", "/__websitebench/health"}:
            return self.send_json(200, {"ok": True, "site_id": SITE_ID})
        if path == "/api/resources":
            page = max(1, int(query.get("page", ["1"])[0]))
            q = query.get("q", [""])[0].strip()
            category = query.get("category", [""])[0].strip()
            filters, params = [], []
            if q:
                filters.append("(title LIKE ? OR summary LIKE ?)")
                params.extend((f"%{q}%", f"%{q}%"))
            if category:
                filters.append("category = ?")
                params.append(category)
            order = "published_at ASC" if query.get("sort", [""])[0] == "oldest" else "published_at DESC"
            return self.send_json(200, paginate("resources", page, 10, " AND ".join(filters), tuple(params), order))
        for prefix, table in (("/api/resources/", "resources"), ("/api/cards/", "cards"), ("/api/providers/", "providers")):
            if path.startswith(prefix):
                with BACKEND.lifecycle.connection() as connection:
                    row = connection.execute(f"SELECT * FROM {table} WHERE slug=?", (unquote(path[len(prefix):]),)).fetchone()
                return self.send_json(200, row_dict(row)) if row else self.send_json(404, {"error": "Item not found"})
        if path == "/api/cards":
            page = max(1, int(query.get("page", ["1"])[0]))
            category = query.get("category", [""])[0].strip()
            order = "annual_fee ASC, id ASC" if query.get("sort", [""])[0] == "fee" else "featured DESC, id ASC"
            return self.send_json(200, paginate("cards", page, 10, "category = ?" if category else "", (category,) if category else (), order))
        if path == "/api/providers":
            page = max(1, int(query.get("page", ["1"])[0]))
            category = query.get("category", [""])[0].strip()
            return self.send_json(200, paginate("providers", page, 12, "category = ?" if category else "", (category,) if category else ()))
        relative = "index.html" if path == "/" else path.lstrip("/")
        if self.serve_file(PUBLIC / relative):
            return
        self.serve_file(PUBLIC / "index.html")

    def do_POST(self):
        path = urlsplit(self.path).path
        try:
            data = self.read_json()
            if path == "/api/quote-drafts":
                postal = " ".join(str(data.get("postal_code", "")).upper().split())
                if not re.fullmatch(r"[A-Z]\d[A-Z] ?\d[A-Z]\d", postal):
                    return self.send_json(422, {"error": "Enter a valid Canadian postal code."})
                with BACKEND.lifecycle.connection(transaction=True) as connection:
                    cursor = connection.execute(
                        "INSERT INTO quote_drafts(product,postal_code,province,status,created_at) VALUES(?,?,?,?,?)",
                        (str(data.get("product", "car"))[:40], postal, str(data.get("province", ""))[:40], "local-draft", now()),
                    )
                    item_id = cursor.lastrowid
                return self.send_json(201, {"id": item_id, "status": "local-draft", "message": "Your comparison draft was saved locally. No provider was contacted."})
            restore = re.fullmatch(r"/api/quote-drafts/(\d+)/restore", path)
            if restore:
                item_id = int(restore.group(1))
                with BACKEND.lifecycle.connection(transaction=True) as connection:
                    connection.execute("UPDATE quote_drafts SET deleted_at=NULL,status='local-draft' WHERE id=?", (item_id,))
                return self.send_json(200, {"id": item_id, "status": "local-draft"})
            if path == "/api/newsletter":
                email = str(data.get("email", "")).strip().lower()
                if not re.fullmatch(r"[^\s@]+@[^\s@]+\.[^\s@]+", email):
                    return self.send_json(422, {"error": "Enter a valid email address."})
                with BACKEND.lifecycle.connection(transaction=True) as connection:
                    cursor = connection.execute(
                        "INSERT INTO newsletter_outbox(purpose,recipient,payload,status,created_at) VALUES(?,?,?,?,?)",
                        ("newsletter", email, '{"local_only":true}', "sandboxed", now()),
                    )
                return self.send_json(201, {"id": cursor.lastrowid, "status": "sandboxed", "message": "Saved to the local outbox. No email was sent."})
            if path == "/api/support":
                if not all(data.get(key) for key in ("email", "subject", "message")):
                    return self.send_json(422, {"error": "Complete all required fields."})
                with BACKEND.lifecycle.connection(transaction=True) as connection:
                    cursor = connection.execute(
                        "INSERT INTO support_tickets(email,subject,message,status,created_at) VALUES(?,?,?,?,?)",
                        (str(data["email"])[:200], str(data["subject"])[:200], str(data["message"])[:4000], "local-inbox", now()),
                    )
                return self.send_json(201, {"id": cursor.lastrowid, "status": "local-inbox", "message": "Saved to the local support inbox."})
            if path == "/api/reset":
                with BACKEND.lifecycle.connection(transaction=True) as connection:
                    connection.executescript("DELETE FROM quote_drafts; DELETE FROM newsletter_outbox; DELETE FROM support_tickets;")
                return self.send_json(200, {"reset": True})
            self.send_json(404, {"error": "Not found"})
        except ValueError as exc:
            self.send_json(413 if str(exc) == "Payload too large" else 400, {"error": str(exc)})
        except Exception:
            self.send_json(500, {"error": "Local server error"})

    def do_DELETE(self):
        match = re.fullmatch(r"/api/quote-drafts/(\d+)", urlsplit(self.path).path)
        if not match:
            return self.send_json(404, {"error": "Not found"})
        item_id = int(match.group(1))
        with BACKEND.lifecycle.connection(transaction=True) as connection:
            connection.execute("UPDATE quote_drafts SET deleted_at=?,status='deleted' WHERE id=?", (now(), item_id))
        self.send_json(200, {"id": item_id, "status": "deleted", "undo_available": True})


def main() -> None:
    host = os.environ.get("HOST", "127.0.0.1")
    port = int(os.environ.get("PORT", "4171"))
    server = ThreadingHTTPServer((host, port), Handler)
    print(f"{SITE_ID} listening on http://{host}:{port}", flush=True)
    server.serve_forever()


if __name__ == "__main__":
    main()