import { getActiveTab, getAliases, isBrowserErrorUrl, resolveGroupId, tabInfo } from '../core';
import { CommandGroup } from '../classes/CommandGroup';
import type { CommandEntry } from '../classes/CommandGroup';
import type { NavOpenArgs, NavToArgs, NavTabArgs, NavFocusArgs, NavWaitArgs, NavOpenWaitArgs } from '../types';

export class NavigationCommands extends CommandGroup {
  readonly namespace = "navigate";
  readonly commands: Record<string, CommandEntry> = {
    "navigate.open":        (a: NavOpenArgs) => this.navOpen(a),
    "navigate.to":          (a: NavToArgs) => this.navTo(a),
    "navigate.reload":      (a: NavTabArgs) => this.navReload(a, false),
    "navigate.hard_reload": (a: NavTabArgs) => this.navReload(a, true),
    "navigate.back":        (a: NavTabArgs) => this.navBack(a),
    "navigate.forward":     (a: NavTabArgs) => this.navForward(a),
    "navigate.focus":       (a: NavFocusArgs) => this.navFocus(a),
    "navigate.wait":        (a: NavWaitArgs) => this.navWait(a),
    "navigate.open_wait":   (a: NavOpenWaitArgs) => this.navOpenWait(a),
  };

  private async navOpen({ url, background, window: windowName, windowId: explicitWindowId, group: groupNameOrId }: NavOpenArgs) {
    let windowId: number | undefined;
    if (explicitWindowId != null) {
      windowId = explicitWindowId;
    } else if (windowName) {
      const aliases = await getAliases();
      const entry = Object.entries(aliases).find(([, v]) => v === windowName);
      if (entry) windowId = parseInt(entry[0]);
    }
    const tab = await chrome.tabs.create({ url, active: !background, windowId });
    if (groupNameOrId != null) {
      let groupId;
      try {
        groupId = await resolveGroupId(groupNameOrId);
        // Close any blank placeholder tabs that were created when the group was made
        const groupTabs = await chrome.tabs.query({ groupId });
        const placeholders = groupTabs.filter(t =>
          t.id !== tab.id &&
          (t.url === "chrome://newtab/" || t.url === "about:blank" || t.pendingUrl === "chrome://newtab/")
        );
        await chrome.tabs.group({ tabIds: [tab.id], groupId });
        if (placeholders.length) await chrome.tabs.remove(placeholders.map(t => t.id));
      } catch (e) {
        if (!(e instanceof Error) || !e.message.startsWith("No tab group found")) throw e;
        // Group doesn't exist — create it with the tab already in it
        groupId = await chrome.tabs.group({ tabIds: [tab.id] });
        await chrome.tabGroups.update(groupId, { title: String(groupNameOrId) });
      }
    }
    return { id: tab.id, url: tab.url };
  }

  private async navTo({ tabId, url }: NavToArgs) {
    const tab = await chrome.tabs.update(tabId, { url });
    return { id: tab.id, url: tab.url || url };
  }

  private async navReload({ tabId }: NavTabArgs, bypassCache: boolean) {
    const tab = tabId ? { id: tabId } : await getActiveTab();
    await chrome.tabs.reload(tab.id, { bypassCache });
    return { tabId: tab.id };
  }

  private async navBack({ tabId }: NavTabArgs) {
    const tab = tabId ? { id: tabId } : await getActiveTab();
    await chrome.tabs.goBack(tab.id);
    return { tabId: tab.id };
  }

  private async navForward({ tabId }: NavTabArgs) {
    const tab = tabId ? { id: tabId } : await getActiveTab();
    await chrome.tabs.goForward(tab.id);
    return { tabId: tab.id };
  }

  private async navFocus({ pattern }: NavFocusArgs) {
    // If pattern is a plain integer, treat it as a tab ID
    const asInt = parseInt(pattern);
    let match: chrome.tabs.Tab | undefined;
    if (!isNaN(asInt) && String(asInt) === String(pattern)) {
      match = await chrome.tabs.get(asInt);
    } else {
      const all = await chrome.tabs.query({});
      match = all.find(t => (t.url && t.url.includes(pattern)) || (t.pendingUrl && t.pendingUrl.includes(pattern)));
    }
    if (!match) return null;
    await chrome.windows.update(match.windowId, { focused: true });
    await chrome.tabs.update(match.id, { active: true });
    return { id: match.id, url: match.url || match.pendingUrl, title: match.title };
  }

  private async navWait({ tabId, timeout = 30000, readyState = "complete" }: NavWaitArgs = {}) {
    const tab = tabId ? { id: tabId } : await getActiveTab();
    const deadline = Date.now() + timeout;
    const interval = 200;
    while (Date.now() < deadline) {
      const t = await chrome.tabs.get(tab.id);
      const currentUrl = t.url || t.pendingUrl || "";
      if (isBrowserErrorUrl(currentUrl)) {
        throw new Error(`Tab ${tab.id} is showing an error page while waiting for load (${currentUrl})`);
      }
      if (readyState === "complete" ? t.status === "complete" : t.status !== "loading") {
        return tabInfo(t);
      }
      await new Promise(r => setTimeout(r, interval));
    }
    throw new Error(`Tab ${tab.id} did not reach status '${readyState}' within ${timeout}ms`);
  }

  private async navOpenWait({ url, timeout = 30000, background, window: windowName, group }: NavOpenWaitArgs = {}) {
    const opened = await this.navOpen({ url, background, window: windowName, group });
    return await this.navWait({ tabId: opened.id, timeout });
  }
}