import { useState, useEffect } from "react";
import { useNavigate } from "react-router-dom";

function Settings({ onConfigSaved }) {
    const [instanceUrl, setInstanceUrl] = useState("");
    const [storedUrl, setStoredUrl] = useState(null);
    const [message, setMessage] = useState(null);
    const [messageType, setMessageType] = useState(null);
    const [loading, setLoading] = useState(false);

    const navigate = useNavigate();

    useEffect(() => {
        chrome.storage.local.get("cdrm_instance", (result) => {
            if (chrome.runtime.lastError) {
                console.error("Error fetching CDRM instance:", chrome.runtime.lastError);
            } else if (result.cdrm_instance) {
                setStoredUrl(result.cdrm_instance);
            }
        });
    }, []);

    const handleSave = async () => {
        const trimmedUrl = instanceUrl.trim().replace(/\/+$/, "");
        if (!trimmedUrl) {
            setMessage("Please enter a valid URL.");
            setMessageType("error");
            return;
        }

        const endpoint = trimmedUrl + "/api/extension";
        setLoading(true);
        setMessage(null);

        try {
            const response = await fetch(endpoint, {
                method: "POST",
                headers: {
                    "Content-Type": "application/json",
                },
            });

            const data = await response.json();

            if (data.status === true) {
                setMessage("Successfully connected to CDRM Instance.");
                setMessageType("success");

                const widevineRes = await fetch(`${trimmedUrl}/remotecdm/widevine/deviceinfo`);
                if (!widevineRes.ok) throw new Error("Failed to fetch Widevine device info");
                const widevineData = await widevineRes.json();

                const playreadyRes = await fetch(`${trimmedUrl}/remotecdm/playready/deviceinfo`);
                if (!playreadyRes.ok) throw new Error("Failed to fetch PlayReady device info");
                const playreadyData = await playreadyRes.json();

                chrome.storage.local.set(
                    {
                        valid_config: true,
                        cdrm_instance: trimmedUrl,
                        widevine_device: {
                            device_type: widevineData.device_type,
                            system_id: widevineData.system_id,
                            security_level: widevineData.security_level,
                            secret: widevineData.secret,
                            device_name: widevineData.device_name,
                            host: trimmedUrl,
                        },
                        playready_device: {
                            security_level: playreadyData.security_level,
                            secret: playreadyData.secret,
                            device_name: playreadyData.device_name,
                            host: trimmedUrl,
                        },
                    },
                    () => {
                        if (chrome.runtime.lastError) {
                            console.error(
                                "Error saving to chrome.storage:",
                                chrome.runtime.lastError
                            );
                            setMessage("Error saving configuration.");
                            setMessageType("error");
                        } else {
                            console.log("Configuration saved.");
                            setStoredUrl(trimmedUrl);
                            setInstanceUrl("");
                            if (onConfigSaved) onConfigSaved();
                            navigate("/results"); // Automatically redirect after success
                        }
                    }
                );
            } else {
                throw new Error("Invalid response from endpoint.");
            }
        } catch (err) {
            console.error("Connection error:", err);
            setMessage("Invalid endpoint or device info could not be retrieved.");
            setMessageType("error");
        } finally {
            setLoading(false);
        }
    };

    return (
        <div className="w-full h-full overflow-y-auto overflow-x-auto flex flex-col p-4">
            {storedUrl && (
                <p className="text-gray-300 mb-2">
                    Current instance: <span className="text-white font-semibold">{storedUrl}</span>
                </p>
            )}

            <p className="mt-3 text-white">New instance URL:</p>
            <input
                type="text"
                value={instanceUrl}
                onChange={(e) => setInstanceUrl(e.target.value)}
                placeholder="https://cdrm-project.com/, http://127.0.0.1:5000/"
                className="w-full p-4 text-lg bg-gray-800 text-white border border-gray-700 rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500 mt-4 font-mono"
            />
            <button
                onClick={handleSave}
                disabled={loading}
                className={`mt-4 p-2 font-bold ${
                    loading ? "bg-blue-400" : "bg-blue-600 hover:bg-blue-700"
                } text-white rounded-md transition duration-300`}
            >
                {loading ? "Connecting..." : "Save settings"}
            </button>

            {message && (
                <p
                    className={`mt-2 text-sm text-center ${
                        messageType === "success" ? "text-green-400" : "text-red-400"
                    }`}
                >
                    {message}
                </p>
            )}
        </div>
    );
}

export default Settings;