// The side bar: Channels, Agents, Inbox and Briefs.

import * as vscode from "vscode";

import { Model } from "./model";

import { when } from "./pure";

abstract class View implements vscode.TreeDataProvider<vscode.TreeItem> {

  private readonly emitter = new vscode.EventEmitter<void>();

  readonly onDidChangeTreeData = this.emitter.event;

  constructor(protected readonly model: Model) {

    model.onDidChange(() => this.emitter.fire());

  }

  getTreeItem(i: vscode.TreeItem): vscode.TreeItem {

    return i;

  }

  getChildren(): vscode.TreeItem[] {

    if (this.model.error) {

      const i = new vscode.TreeItem("Spectra is not answering");

      i.description = this.model.error;

      i.tooltip = this.model.error;

      i.iconPath = new vscode.ThemeIcon("warning");

      i.command = { command: "spectra.refresh", title: "Refresh" };

      return [i];

    }

    return this.items();

  }

  protected abstract items(): vscode.TreeItem[];

}

const PRESENCE: Record<string, string> = { online: "charts.green", busy: "charts.purple", idle: "charts.yellow", blocked: "charts.orange", paused: "charts.yellow", offline: "disabledForeground" };

export class Agents extends View {

  protected items(): vscode.TreeItem[] {

    return this.model.agents

      .filter((a) => !a.disabled)

      .map((a) => {

        const i = new vscode.TreeItem(a.name);

        const also = (a.channels ?? []).map((c) => `#${c}`);

        i.description = `${a.presence} · #${a.project}${also.length ? ` +${also.join(" ")}` : ""}${a.status ? ` · ${a.status}` : ""}`;

        const expires = a.delegation_expires ? `\nMay act for you until ${new Date(a.delegation_expires).toLocaleString()}` : "";

        const state = a.state && a.state !== "ok" ? `\n⚠ ${a.state}` : "";

        const may = also.length ? `\nMay also post in ${also.join(", ")}` : "";

        i.tooltip = `${a.display}\n${a.kind}${expires}${may}${state}`;

        i.iconPath = new vscode.ThemeIcon(a.state && a.state !== "ok" ? "warning" : "circle-filled", new vscode.ThemeColor(PRESENCE[a.presence] ?? "disabledForeground"));

        i.contextValue = "agent";

        i.id = `agent:${a.name}`;

        return i;

      });

  }

}

export class Channels extends View {

  protected items(): vscode.TreeItem[] {

    const mine = this.model.folderProject();

    const rows = [...this.model.channels].filter((c) => c.kind !== "system").sort((a, b) => Number(b.name === mine) - Number(a.name === mine));

    return rows.map((c) => {

      const i = new vscode.TreeItem(c.display);

      const own = this.model.agents.filter((a) => !a.disabled && a.project === c.name).map((a) => a.name);

      const guests = this.model.agents.filter((a) => !a.disabled && (a.channels ?? []).includes(c.name)).map((a) => a.name);

      i.description = c.purpose ?? undefined;

      const who = c.kind === "project" ? `\nAgents who may post: ${[...own, ...guests].join(", ") || "none yet"}` : "";

      i.tooltip = `${c.display}${c.purpose ? `\n${c.purpose}` : ""}\n${c.messages} message(s)${who}`;

      i.contextValue = c.kind === "project" ? "projectChannel" : "channel";

      i.iconPath = new vscode.ThemeIcon(c.kind === "direct" ? "mention" : c.name === mine ? "star-full" : "comment-discussion");

      i.command = { command: "spectra.openChannel", title: "Open", arguments: [c.name] };

      i.id = `channel:${c.name}`;

      return i;

    });

  }

}

export class Inbox extends View {

  protected items(): vscode.TreeItem[] {

    if (!this.model.inbox.length) {

      const i = new vscode.TreeItem("Nothing unread");

      i.iconPath = new vscode.ThemeIcon("check");

      return [i];

    }

    return this.model.inbox.map((m) => {

      const i = new vscode.TreeItem(m.summary.replace(/\s+/g, " ").slice(0, 120));

      i.description = `${m.from_display || m.from} · ${m.channel} · ${when(m.at_ms)}`;

      i.iconPath = new vscode.ThemeIcon(m.kind === "dm" ? "mail" : "mention");

      i.command = { command: "spectra.openChannel", title: "Open", arguments: [m.channel.replace(/^#/, "")] };

      return i;

    });

  }

}

export class Briefs extends View {

  protected items(): vscode.TreeItem[] {

    const overall = new vscode.TreeItem("Overall brief");

    overall.description = this.model.briefs.overall ? firstLine(this.model.briefs.overall) : "not set";

    overall.iconPath = new vscode.ThemeIcon("globe");

    overall.command = { command: "spectra.editOverallBrief", title: "Edit" };

    const items = [overall];

    for (const p of this.model.projects) {

      const b = this.model.briefs.projects.find((x) => x.project === p.name);

      const i = new vscode.TreeItem(p.name);

      i.description = b ? firstLine(b.text) : "not set";

      i.iconPath = new vscode.ThemeIcon("note");

      i.command = { command: "spectra.editProjectBrief", title: "Edit", arguments: [p.name] };

      items.push(i);

    }

    return items;

  }

}

function firstLine(s: string): string {

  return s.trim().split("\n")[0].slice(0, 80);

}