const { $, showView, showFlash, escapeHtml } = require("./helpers");
const { state, saveState } = require("../../shared/state");
const { ETHEREUM_MAINNET_CHAIN_ID } = require("../../shared/constants");
const { log, debugFetch } = require("../../shared/log");

const runtime =
    typeof browser !== "undefined" ? browser.runtime : chrome.runtime;

function renderSiteList(containerId, siteMap, stateKey) {
    const container = $(containerId);
    const hostnames = [...new Set(Object.values(siteMap).flat())];
    if (hostnames.length === 0) {
        container.innerHTML = '<p class="text-xs text-muted">None</p>';
        return;
    }
    let html = "";
    hostnames.forEach((hostname) => {
        html += `<div class="flex justify-between items-center text-xs py-1 border-b border-border-light">`;
        html += `<span>${hostname}</span>`;
        html += `<button class="btn-remove-site border border-border px-1 hover:bg-fg hover:text-bg cursor-pointer" data-key="${stateKey}" data-hostname="${hostname}">[x]</button>`;
        html += `</div>`;
    });
    container.innerHTML = html;
    container.querySelectorAll(".btn-remove-site").forEach((btn) => {
        btn.addEventListener("click", async () => {
            const key = btn.dataset.key;
            const host = btn.dataset.hostname;
            for (const addr of Object.keys(state[key])) {
                state[key][addr] = state[key][addr].filter((h) => h !== host);
                if (state[key][addr].length === 0) {
                    delete state[key][addr];
                }
            }
            await saveState();
            runtime.sendMessage({ type: "AUTISTMASK_REMOVE_SITE" });
            renderSiteList(containerId, state[key], key);
        });
    });
}

function renderTrackedTokens() {
    const container = $("settings-tracked-tokens");
    if (state.trackedTokens.length === 0) {
        container.innerHTML = '<p class="text-xs text-muted">None</p>';
        return;
    }
    let html = "";
    state.trackedTokens.forEach((token, idx) => {
        const label = token.name
            ? escapeHtml(token.name) + " (" + escapeHtml(token.symbol) + ")"
            : escapeHtml(token.symbol);
        html += `<div class="flex justify-between items-center text-xs py-1 border-b border-border-light">`;
        html += `<span>${label}</span>`;
        html += `<button class="btn-remove-token border border-border px-1 hover:bg-fg hover:text-bg cursor-pointer" data-idx="${idx}">[x]</button>`;
        html += `</div>`;
    });
    container.innerHTML = html;
    container.querySelectorAll(".btn-remove-token").forEach((btn) => {
        btn.addEventListener("click", async () => {
            const idx = parseInt(btn.dataset.idx, 10);
            state.trackedTokens.splice(idx, 1);
            await saveState();
            renderTrackedTokens();
        });
    });
}

function show() {
    $("settings-rpc").value = state.rpcUrl;
    $("settings-blockscout").value = state.blockscoutUrl;
    renderTrackedTokens();
    renderSiteLists();
    showView("settings");
}

function renderSiteLists() {
    renderSiteList(
        "settings-allowed-sites",
        state.allowedSites,
        "allowedSites",
    );
    renderSiteList("settings-denied-sites", state.deniedSites, "deniedSites");
}

function init(ctx) {
    $("btn-save-rpc").addEventListener("click", async () => {
        const url = $("settings-rpc").value.trim();
        if (!url) {
            showFlash("Please enter an RPC URL.");
            return;
        }
        showFlash("Testing endpoint...");
        try {
            const resp = await debugFetch(url, {
                method: "POST",
                headers: { "Content-Type": "application/json" },
                body: JSON.stringify({
                    jsonrpc: "2.0",
                    id: 1,
                    method: "eth_chainId",
                    params: [],
                }),
            });
            const json = await resp.json();
            if (json.error) {
                log.errorf("RPC validation error:", json.error);
                showFlash("Endpoint returned error: " + json.error.message);
                return;
            }
            if (json.result !== ETHEREUM_MAINNET_CHAIN_ID) {
                showFlash(
                    "Wrong network (expected mainnet, got chain " +
                        json.result +
                        ").",
                );
                return;
            }
        } catch (e) {
            log.errorf("RPC validation fetch failed:", e.message);
            showFlash("Could not reach endpoint.");
            return;
        }
        state.rpcUrl = url;
        await saveState();
        showFlash("Saved.");
    });

    $("btn-save-blockscout").addEventListener("click", async () => {
        const url = $("settings-blockscout").value.trim();
        if (!url) {
            showFlash("Please enter a Blockscout API URL.");
            return;
        }
        showFlash("Testing endpoint...");
        try {
            const resp = await debugFetch(url + "/stats");
            if (!resp.ok) {
                showFlash("Endpoint returned HTTP " + resp.status + ".");
                return;
            }
        } catch (e) {
            log.errorf("Blockscout validation failed:", e.message);
            showFlash("Could not reach endpoint.");
            return;
        }
        state.blockscoutUrl = url;
        await saveState();
        showFlash("Saved.");
    });

    $("settings-show-zero-balances").checked = state.showZeroBalanceTokens;
    $("settings-show-zero-balances").addEventListener("change", async () => {
        state.showZeroBalanceTokens = $("settings-show-zero-balances").checked;
        await saveState();
    });

    $("settings-hide-low-holders").checked = state.hideLowHolderTokens;
    $("settings-hide-low-holders").addEventListener("change", async () => {
        state.hideLowHolderTokens = $("settings-hide-low-holders").checked;
        await saveState();
    });

    $("settings-hide-fraud-contracts").checked = state.hideFraudContracts;
    $("settings-hide-fraud-contracts").addEventListener("change", async () => {
        state.hideFraudContracts = $("settings-hide-fraud-contracts").checked;
        await saveState();
    });

    $("settings-hide-dust").checked = state.hideDustTransactions;
    $("settings-hide-dust").addEventListener("change", async () => {
        state.hideDustTransactions = $("settings-hide-dust").checked;
        await saveState();
    });

    $("settings-dust-threshold").value = state.dustThresholdGwei;
    $("settings-dust-threshold").addEventListener("change", async () => {
        const val = parseInt($("settings-dust-threshold").value, 10);
        if (!isNaN(val) && val >= 0) {
            state.dustThresholdGwei = val;
            await saveState();
        }
    });

    $("btn-main-add-wallet").addEventListener("click", ctx.showAddWalletView);

    $("btn-settings-add-token").addEventListener(
        "click",
        ctx.showSettingsAddTokenView,
    );

    $("btn-settings-back").addEventListener("click", () => {
        ctx.renderWalletList();
        showView("main");
    });
}

module.exports = { init, show, renderSiteLists };