import { test } from "node:test";
import assert from "node:assert";
import lib from "../tailscalectl/lib.js";

const {
    parsePeers,
    makeExitNodeCommand,
    findActiveExitNode,
    errorMessage,
    formatError,
    getStatusCommand,
    isValidExitNodeHostname,
    getClipboardCommands,
    buildToggleCommand,
    parseStatusResult,
    getStrings,
    PendingAction,
    commandForPendingAction
} = lib;

/*
 * Unit tests for pure functions in lib.js.
 *
 * TailscaleWidget.qml has no automated test coverage. Proc.runCommand
 * coordination, busy-mutex behavior, and widget UI must be verified
 * manually in a running DMS instance.
 */

// --- parsePeers ---

test("parsePeers extracts exitNode from ExitNodeOption", () => {
    const peerMap = {
        "peer-1": {
            HostName: "router",
            TailscaleIPs: ["100.64.0.1"],
            Online: true,
            ExitNodeOption: true
        },
        "peer-2": {
            HostName: "laptop",
            TailscaleIPs: ["100.64.0.2"],
            Online: true,
            ExitNodeOption: false
        }
    };

    const peers = parsePeers(peerMap);

    assert.strictEqual(peers.length, 2);
    assert.strictEqual(peers[0].exitNode, true);
    assert.strictEqual(peers[1].exitNode, false);
    assert.strictEqual(peers[0].hostname, "router");
    assert.strictEqual(peers[0].ip, "100.64.0.1");
    assert.strictEqual(peers[0].online, true);
});

test("parsePeers returns empty array for null/undefined peerMap", () => {
    assert.deepStrictEqual(parsePeers(null), []);
    assert.deepStrictEqual(parsePeers(undefined), []);
});

test("parsePeers returns empty array for empty peerMap", () => {
    assert.deepStrictEqual(parsePeers({}), []);
});

test("parsePeers falls back to key when HostName missing", () => {
    const peers = parsePeers({
        "node-key-abc": { TailscaleIPs: ["100.64.0.9"], Online: false }
    });
    assert.strictEqual(peers[0].hostname, "node-key-abc");
    assert.strictEqual(peers[0].ip, "100.64.0.9");
    assert.strictEqual(peers[0].online, false);
    assert.strictEqual(peers[0].exitNode, false);
});

test("parsePeers uses empty ip when TailscaleIPs missing or empty", () => {
    const peers = parsePeers({
        a: { HostName: "a" },
        b: { HostName: "b", TailscaleIPs: [] }
    });
    assert.strictEqual(peers[0].ip, "");
    assert.strictEqual(peers[1].ip, "");
});

// --- makeExitNodeCommand / hostname validation ---

test("makeExitNodeCommand returns tailscale set command for hostname", () => {
    const cmd = makeExitNodeCommand("router");
    assert.deepStrictEqual(cmd, ["tailscale", "set", "--exit-node=router"]);
});

test("makeExitNodeCommand with empty string clears exit node", () => {
    const cmd = makeExitNodeCommand("");
    assert.deepStrictEqual(cmd, ["tailscale", "set", "--exit-node="]);
});

test("makeExitNodeCommand returns null for invalid hostname", () => {
    assert.strictEqual(makeExitNodeCommand("; rm"), null);
    assert.strictEqual(makeExitNodeCommand("$(whoami)"), null);
    assert.strictEqual(makeExitNodeCommand(null), null);
    assert.strictEqual(makeExitNodeCommand(42), null);
});

test("makeExitNodeCommand still produces correct argv for valid input", () => {
    assert.deepStrictEqual(makeExitNodeCommand(""), ["tailscale", "set", "--exit-node="]);
    assert.deepStrictEqual(makeExitNodeCommand("gluetun-sjc"), ["tailscale", "set", "--exit-node=gluetun-sjc"]);
});

test("isValidExitNodeHostname accepts empty string (clear)", () => {
    assert.strictEqual(isValidExitNodeHostname(""), true);
});

test("isValidExitNodeHostname accepts realistic Tailscale hostnames", () => {
    ["router", "gluetun-sjc", "my-exit-node-01", "peer_with_underscore", "a.b.c"].forEach((h) => {
        assert.strictEqual(isValidExitNodeHostname(h), true, h);
    });
});

test("isValidExitNodeHostname accepts MagicDNS-style FQDNs under 253 chars", () => {
    assert.strictEqual(isValidExitNodeHostname("my-node.tail1234.ts.net"), true);
    const longButValid = "a".repeat(60) + "." + "b".repeat(60) + "." + "c".repeat(60);
    assert.ok(longButValid.length < 253);
    assert.strictEqual(isValidExitNodeHostname(longButValid), true);
});

test("isValidExitNodeHostname rejects injection attempts and garbage", () => {
    ["; rm -rf /", "$(whoami)", "`id`", "foo;bar", "a&b", "x\ny", "evil$(date)", " spacy ", "-leading", "trailing-"].forEach((h) => {
        assert.strictEqual(isValidExitNodeHostname(h), false, h);
    });
});

test("isValidExitNodeHostname rejects non-strings and oversized names", () => {
    assert.strictEqual(isValidExitNodeHostname(undefined), false);
    assert.strictEqual(isValidExitNodeHostname({}), false);
    assert.strictEqual(isValidExitNodeHostname("x".repeat(254)), false);
});

// --- findActiveExitNode ---

test("findActiveExitNode returns hostname of peer with ExitNode=true", () => {
    const peerMap = {
        "peer-1": { HostName: "gluetun-sjc", ExitNode: true, ExitNodeOption: true },
        "peer-2": { HostName: "gluetun-den", ExitNode: false, ExitNodeOption: true }
    };
    assert.strictEqual(findActiveExitNode(peerMap), "gluetun-sjc");
});

test("findActiveExitNode returns empty string when no exit node", () => {
    const peerMap = {
        "peer-1": { HostName: "laptop", ExitNode: false, ExitNodeOption: false }
    };
    assert.strictEqual(findActiveExitNode(peerMap), "");
});

test("findActiveExitNode returns empty string for null peerMap", () => {
    assert.strictEqual(findActiveExitNode(null), "");
});

test("findActiveExitNode falls back to map key when HostName missing", () => {
    const peerMap = {
        "key-only": { ExitNode: true }
    };
    assert.strictEqual(findActiveExitNode(peerMap), "key-only");
});

// --- errorMessage / formatError ---

test("errorMessage returns user-friendly messages for known actions", () => {
    assert.strictEqual(errorMessage("up"), "Failed to connect to Tailscale");
    assert.strictEqual(errorMessage("connect"), "Failed to connect to Tailscale");
    assert.strictEqual(errorMessage("down"), "Failed to disconnect from Tailscale");
    assert.strictEqual(errorMessage("disconnect"), "Failed to disconnect from Tailscale");
    assert.strictEqual(errorMessage("set"), "Failed to set exit node");
    assert.strictEqual(errorMessage("status"), "Failed to read Tailscale status");
    assert.strictEqual(errorMessage("clipboard"), "Error copying to clipboard");
});

test("errorMessage returns generic message for unknown command", () => {
    assert.strictEqual(errorMessage("unknown"), "Tailscale command failed");
});

test("formatError returns base message without detail", () => {
    assert.strictEqual(formatError("status"), "Failed to read Tailscale status");
    assert.strictEqual(formatError("set"), "Failed to set exit node");
});

test("formatError appends and truncates detail to 120 chars", () => {
    const longDetail = "x".repeat(200);
    const msg = formatError("up", longDetail);
    assert.ok(msg.includes("Failed to connect to Tailscale"));
    assert.ok(msg.endsWith("x".repeat(120)));
    assert.ok(msg.length < 200);
});

test("formatError handles empty or falsy detail gracefully", () => {
    assert.strictEqual(formatError("down", ""), "Failed to disconnect from Tailscale");
    assert.strictEqual(formatError("connect", null), "Failed to connect to Tailscale");
});

// --- clipboard ---

test("getClipboardCommands returns ordered argv arrays with text appended", () => {
    const cmds = getClipboardCommands("1.2.3.4");
    assert.ok(Array.isArray(cmds));
    assert.strictEqual(cmds.length, 2);
    assert.deepStrictEqual(cmds[0], ["dms", "cl", "copy", "1.2.3.4"]);
    assert.deepStrictEqual(cmds[1], ["wl-copy", "1.2.3.4"]);
});

test("getClipboardCommands handles text with special characters safely (direct argv)", () => {
    const cmds = getClipboardCommands("it's a 'test' with \"quotes\" and\nnewlines");
    assert.ok(Array.isArray(cmds));
    assert.strictEqual(cmds.length, 2);
    assert.ok(cmds[0].includes("it's a 'test' with \"quotes\" and\nnewlines"));
});

// --- strings ---

test("getStrings returns canonical UI strings for the widget", () => {
    const s = getStrings();
    assert.ok(s.header);
    assert.ok(s.connected);
    assert.ok(s.disconnected);
    assert.ok(s.exitNodePrefix);
    assert.ok(s.none);
    assert.ok(s.copied);
    assert.ok(s.invalidExitNodeHostname);
    assert.ok(s.notConnectedHint);
});

test("getStrings.copied is the I18n template key (interpolation via .arg at call site)", () => {
    const s = getStrings();
    assert.strictEqual(s.copied, "Copied %1 to clipboard");
});

// --- toggle helpers ---

test("buildToggleCommand returns down when connected", () => {
    assert.deepStrictEqual(buildToggleCommand(true), ["tailscale", "down"]);
});

test("buildToggleCommand returns up when disconnected", () => {
    assert.deepStrictEqual(buildToggleCommand(false), ["tailscale", "up"]);
});

test("buildToggleCommand treats null and undefined as disconnected", () => {
    assert.deepStrictEqual(buildToggleCommand(null), ["tailscale", "up"]);
    assert.deepStrictEqual(buildToggleCommand(undefined), ["tailscale", "up"]);
});

test("commandForPendingAction returns toggle command when pending is TOGGLE and statusOk", () => {
    assert.deepStrictEqual(commandForPendingAction(PendingAction.TOGGLE, true, true), ["tailscale", "down"]);
    assert.deepStrictEqual(commandForPendingAction(PendingAction.TOGGLE, false, true), ["tailscale", "up"]);
    assert.deepStrictEqual(commandForPendingAction(PendingAction.TOGGLE, null, true), ["tailscale", "up"]);
});

test("commandForPendingAction returns null when status poll failed (do not invent up/down)", () => {
    assert.strictEqual(commandForPendingAction(PendingAction.TOGGLE, false, false), null);
    assert.strictEqual(commandForPendingAction(PendingAction.TOGGLE, true, false), null);
    assert.strictEqual(commandForPendingAction(PendingAction.TOGGLE, false, undefined), null);
});

test("commandForPendingAction returns null for no pending action or unknown pending value", () => {
    assert.strictEqual(commandForPendingAction(null, true, true), null);
    assert.strictEqual(commandForPendingAction(undefined, false, true), null);
    assert.strictEqual(commandForPendingAction("something-else", true, true), null);
    assert.strictEqual(commandForPendingAction("", true, true), null);
});

// --- parseStatusResult (#55 and ground-truth parsing) ---

test("parseStatusResult produces correct state from valid Running JSON", () => {
    const json = JSON.stringify({
        BackendState: "Running",
        Self: { TailscaleIPs: ["100.64.0.5"] },
        Peer: {
            "key-1": {
                HostName: "router",
                TailscaleIPs: ["100.64.0.1"],
                Online: true,
                ExitNode: true,
                ExitNodeOption: true
            }
        }
    });
    const state = parseStatusResult(json);
    assert.strictEqual(state.isConnected, true);
    assert.strictEqual(state.tailscaleIP, "100.64.0.5");
    assert.strictEqual(state.currentExitNode, "router");
    assert.strictEqual(state.peers.length, 1);
});

test("parseStatusResult returns safe defaults for invalid JSON", () => {
    const state = parseStatusResult("not json at all");
    assert.strictEqual(state.isConnected, false);
    assert.strictEqual(state.tailscaleIP, "");
    assert.strictEqual(state.currentExitNode, "");
    assert.deepStrictEqual(state.peers, []);
});

test("parseStatusResult handles missing Self gracefully when Running", () => {
    const json = JSON.stringify({ BackendState: "Running", Peer: {} });
    const state = parseStatusResult(json);
    assert.strictEqual(state.isConnected, true);
    assert.strictEqual(state.tailscaleIP, "");
});

test("parseStatusResult handles missing and empty Peer gracefully when Running", () => {
    const json = JSON.stringify({
        BackendState: "Running",
        Self: { TailscaleIPs: ["100.64.0.5"] }
    });
    const state = parseStatusResult(json);
    assert.strictEqual(state.peers.length, 0);
    assert.strictEqual(state.currentExitNode, "");
});

test("parseStatusResult sets isConnected false for non-Running BackendState", () => {
    const json = JSON.stringify({
        BackendState: "NeedsLogin",
        Self: { TailscaleIPs: ["100.64.0.5"] },
        Peer: {}
    });
    const state = parseStatusResult(json);
    assert.strictEqual(state.isConnected, false);
});

// #55: disconnected must not surface peer list / exit node from leftover JSON
test("parseStatusResult clears peers and exit node when BackendState is not Running (#55)", () => {
    const json = JSON.stringify({
        BackendState: "Stopped",
        Self: { TailscaleIPs: ["100.64.0.5"] },
        Peer: {
            "k1": {
                HostName: "router",
                TailscaleIPs: ["100.64.0.1"],
                Online: false,
                ExitNode: true,
                ExitNodeOption: true
            }
        }
    });
    const state = parseStatusResult(json);
    assert.strictEqual(state.isConnected, false);
    assert.deepStrictEqual(state.peers, []);
    assert.strictEqual(state.currentExitNode, "");
    // Self IP may still appear in raw JSON; we clear display IP when disconnected
    // so the popout does not look "half connected".
    assert.strictEqual(state.tailscaleIP, "");
});

test("parseStatusResult clears peers for NeedsLogin even if Peer map is populated (#55)", () => {
    const json = JSON.stringify({
        BackendState: "NeedsLogin",
        Self: { TailscaleIPs: ["100.64.0.5"] },
        Peer: {
            "k1": { HostName: "ghost", TailscaleIPs: ["100.64.0.2"], Online: false }
        }
    });
    const state = parseStatusResult(json);
    assert.strictEqual(state.isConnected, false);
    assert.deepStrictEqual(state.peers, []);
    assert.strictEqual(state.currentExitNode, "");
    assert.strictEqual(state.tailscaleIP, "");
});

// --- getStatusCommand ---

test("getStatusCommand returns the canonical tailscale status --json argv", () => {
    const cmd = getStatusCommand();
    assert.deepStrictEqual(cmd, ["tailscale", "status", "--json"]);
});

// --- PendingAction constant ---

test("PendingAction.TOGGLE is the stable string used by the widget", () => {
    assert.strictEqual(PendingAction.TOGGLE, "toggle");
});

// --- export surface: no over-abstracted UI predicates ---

test("lib does not export trivial UI predicates shouldShowClearExitNode / isActiveExitNode", () => {
    assert.strictEqual(lib.shouldShowClearExitNode, undefined);
    assert.strictEqual(lib.isActiveExitNode, undefined);
});