import path from "path";
import { BrowserWindow, BrowserView, Updater } from "electrobun/bun";
import { PtyClient } from "./pty-client.ts";
import { settingsDb } from "./settings-db.ts";
import type { PtyRPCSchema } from "../shared/pty-rpc-schema.ts";

const DEV_SERVER_PORT = 9760; // Project convention: 9700+ range
const DEV_SERVER_URL = `http://localhost:${DEV_SERVER_PORT}`;

// ── PTY daemon client ────────────────────────────────────────────────────────

// Resolve daemon socket directory. agor-ptyd writes ptyd.sock and ptyd.token
// into $XDG_RUNTIME_DIR/agor or ~/.local/share/agor/run.
const ptyClient = new PtyClient();

async function connectToDaemon(retries = 5, delayMs = 500): Promise<boolean> {
  for (let attempt = 1; attempt <= retries; attempt++) {
    try {
      await ptyClient.connect();
      console.log("[agor-ptyd] Connected to PTY daemon");
      return true;
    } catch (err) {
      const msg = err instanceof Error ? err.message : String(err);
      if (attempt < retries) {
        console.warn(`[agor-ptyd] Connect attempt ${attempt}/${retries} failed: ${msg}. Retrying in ${delayMs}ms…`);
        await new Promise((r) => setTimeout(r, delayMs));
        delayMs = Math.min(delayMs * 2, 4000);
      } else {
        console.error(`[agor-ptyd] Could not connect after ${retries} attempts: ${msg}`);
        console.error("[agor-ptyd] Terminals will not work. Start agor-ptyd and restart the app.");
      }
    }
  }
  return false;
}

// ── RPC definition ────────────────────────────────────────────────────────────

/**
 * BrowserView.defineRPC defines handlers that the WebView can call.
 * The schema type parameter describes what the Bun side handles (requests from
 * WebView) and what messages Bun sends to the WebView.
 *
 * Pattern: handlers.requests = WebView→Bun calls
 *          handlers.messages = Bun→WebView fire-and-forget
 * To push a message to the WebView: rpc.send["pty.output"](payload)
 */
const rpc = BrowserView.defineRPC<PtyRPCSchema>({
  maxRequestTime: 10_000,
  handlers: {
    requests: {
      "pty.create": async ({ sessionId, cols, rows, cwd }) => {
        if (!ptyClient.isConnected) {
          return { ok: false, error: "PTY daemon not connected" };
        }
        try {
          ptyClient.createSession({ id: sessionId, cols, rows, cwd });
          // Don't call subscribe() — CreateSession already auto-subscribes
          // the creating client and starts a fanout task.
          return { ok: true };
        } catch (err) {
          const error = err instanceof Error ? err.message : String(err);
          console.error(`[pty.create] ${sessionId}: ${error}`);
          return { ok: false, error };
        }
      },

      "pty.write": ({ sessionId, data }) => {
        if (!ptyClient.isConnected) return { ok: false };
        try {
          ptyClient.writeInput(sessionId, data);
          return { ok: true };
        } catch (err) {
          console.error(`[pty.write] ${sessionId}:`, err);
          return { ok: false };
        }
      },

      "pty.resize": ({ sessionId, cols, rows }) => {
        if (!ptyClient.isConnected) return { ok: true }; // Best-effort
        try {
          ptyClient.resize(sessionId, cols, rows);
        } catch { /* ignore */ }
        return { ok: true };
      },

      "pty.unsubscribe": ({ sessionId }) => {
        try {
          ptyClient.unsubscribe(sessionId);
        } catch { /* ignore */ }
        return { ok: true };
      },

      "pty.close": ({ sessionId }) => {
        try {
          ptyClient.closeSession(sessionId);
        } catch { /* ignore */ }
        return { ok: true };
      },

      // ── Settings handlers ─────────────────────────────────────────────────

      "settings.get": ({ key }) => {
        try {
          return { value: settingsDb.getSetting(key) };
        } catch (err) {
          console.error("[settings.get]", err);
          return { value: null };
        }
      },

      "settings.set": ({ key, value }) => {
        try {
          settingsDb.setSetting(key, value);
          return { ok: true };
        } catch (err) {
          console.error("[settings.set]", err);
          return { ok: false };
        }
      },

      "settings.getAll": () => {
        try {
          return { settings: settingsDb.getAll() };
        } catch (err) {
          console.error("[settings.getAll]", err);
          return { settings: {} };
        }
      },

      "settings.getProjects": () => {
        try {
          const projects = settingsDb.listProjects().map((p) => ({
            id: p.id,
            config: JSON.stringify(p),
          }));
          return { projects };
        } catch (err) {
          console.error("[settings.getProjects]", err);
          return { projects: [] };
        }
      },

      "settings.setProject": ({ id, config }) => {
        try {
          const parsed = JSON.parse(config);
          settingsDb.setProject(id, { id, ...parsed });
          return { ok: true };
        } catch (err) {
          console.error("[settings.setProject]", err);
          return { ok: false };
        }
      },

      // ── Custom Themes handlers ───────────────────────────────────────────

      "themes.getCustom": () => {
        try {
          return { themes: settingsDb.getCustomThemes() };
        } catch (err) {
          console.error("[themes.getCustom]", err);
          return { themes: [] };
        }
      },

      "themes.saveCustom": ({ id, name, palette }) => {
        try {
          settingsDb.saveCustomTheme(id, name, palette);
          return { ok: true };
        } catch (err) {
          console.error("[themes.saveCustom]", err);
          return { ok: false };
        }
      },

      "themes.deleteCustom": ({ id }) => {
        try {
          settingsDb.deleteCustomTheme(id);
          return { ok: true };
        } catch (err) {
          console.error("[themes.deleteCustom]", err);
          return { ok: false };
        }
      },
    },

    messages: {
      // Messages section defines what the WebView can *send* to Bun (fire-and-forget).
      // We don't expect any inbound messages from the WebView in this direction.
    },
  },
});

// ── Forward daemon events to WebView ────────────────────────────────────────

// session_output: forward each chunk to the WebView as a "pty.output" message.
ptyClient.on("session_output", (msg) => {
  if (msg.type !== "session_output") return;
  try {
    // data is already base64 from the daemon — pass it straight through.
    rpc.send["pty.output"]({ sessionId: msg.session_id, data: msg.data });
  } catch (err) {
    console.error("[pty.output] forward error:", err);
  }
});

// session_closed: notify the WebView so it can display "[Process exited]".
ptyClient.on("session_closed", (msg) => {
  if (msg.type !== "session_closed") return;
  try {
    rpc.send["pty.closed"]({ sessionId: msg.session_id, exitCode: msg.exit_code });
  } catch (err) {
    console.error("[pty.closed] forward error:", err);
  }
});

// ── App window ───────────────────────────────────────────────────────────────

async function getMainViewUrl(): Promise<string> {
  const channel = await Updater.localInfo.channel();
  if (channel === "dev") {
    try {
      await fetch(DEV_SERVER_URL, { method: "HEAD" });
      console.log(`HMR enabled: Using Vite dev server at ${DEV_SERVER_URL}`);
      return DEV_SERVER_URL;
    } catch {
      console.log(
        "Vite dev server not running. Run 'bun run dev:hmr' for HMR support.",
      );
    }
  }
  return "views://mainview/index.html";
}

// Connect to daemon (non-blocking — window opens regardless).
connectToDaemon();

const url = await getMainViewUrl();

const mainWindow = new BrowserWindow({
  title: "Agent Orchestrator — Electrobun",
  url,
  rpc,
  frame: {
    width: 1400,
    height: 900,
    x: 100,
    y: 100,
  },
});

console.log("Agent Orchestrator (Electrobun) started!");