import os
import re
from pathlib import Path

import resend
from flask import Flask, jsonify, request, send_from_directory
from dotenv import load_dotenv

load_dotenv()

SITE_ROOT = Path(__file__).parent.resolve()

RESEND_API_KEY = os.environ.get("RESEND_API_KEY", "")
CONTACT_TO = os.environ.get("CONTACT_TO", "alex@lean-101.com")
CONTACT_FROM = os.environ.get("CONTACT_FROM", "Lean 101 Website <noreply@lean-101.com>")

resend.api_key = RESEND_API_KEY

app = Flask(__name__, static_folder=None)

EMAIL_RE = re.compile(r"^[^@\s]+@[^@\s]+\.[^@\s]+$")


def _clip(value: str, limit: int) -> str:
    value = (value or "").strip()
    return value[:limit]


@app.post("/api/contact")
def contact():
    form = request.form if request.form else request.get_json(silent=True) or {}

    if (form.get("website") or "").strip():
        return jsonify({"ok": True}), 200

    name = _clip(form.get("name", ""), 200)
    email = _clip(form.get("email", ""), 200)
    company = _clip(form.get("company", ""), 200)
    message = _clip(form.get("message", ""), 5000)

    if not name or not email or not message:
        return jsonify({"error": "Please fill in your name, email, and message."}), 400
    if not EMAIL_RE.match(email):
        return jsonify({"error": "That email address doesn't look right."}), 400

    if not RESEND_API_KEY:
        app.logger.error("RESEND_API_KEY not configured")
        return jsonify({"error": "Email is not configured on the server."}), 500

    html = (
        f"<p><strong>Name:</strong> {name}</p>"
        f"<p><strong>Email:</strong> {email}</p>"
        f"<p><strong>Company:</strong> {company or '—'}</p>"
        f"<p><strong>Looking to improve:</strong></p>"
        f"<p>{message.replace(chr(10), '<br>')}</p>"
    )

    try:
        resend.Emails.send({
            "from": CONTACT_FROM,
            "to": [CONTACT_TO],
            "reply_to": email,
            "subject": f"New Lean 101 enquiry — {name}"
                       + (f" ({company})" if company else ""),
            "html": html,
        })
    except Exception as exc:
        app.logger.exception("Resend send failed: %s", exc)
        return jsonify({"error": "Couldn't send your message. Please try again."}), 502

    return jsonify({"ok": True}), 200


@app.route("/", defaults={"path": ""})
@app.route("/<path:path>")
def static_files(path: str):
    if not path:
        return send_from_directory(SITE_ROOT, "index.html")

    target = (SITE_ROOT / path).resolve()
    try:
        target.relative_to(SITE_ROOT)
    except ValueError:
        return ("Not found", 404)

    if target.is_dir():
        index = target / "index.html"
        if index.exists():
            return send_from_directory(target, "index.html")
        return ("Not found", 404)

    if target.exists():
        return send_from_directory(target.parent, target.name)

    html_candidate = target.with_suffix(".html")
    if html_candidate.exists():
        return send_from_directory(html_candidate.parent, html_candidate.name)

    return ("Not found", 404)


if __name__ == "__main__":
    app.run(host="127.0.0.1", port=int(os.environ.get("PORT", "5000")), debug=True)