import fs from "fs";
import path from "path";
import stripAnsi from "strip-ansi";
import { buildBootstrapPrompt } from "./bootstrapPrompt.js";
import { buildProjectSelectionPrompt } from "./bootstrapPrompt.js";
import { LogService } from "./logService.js";
import { PtyService } from "./ptyService.js";
import { getClaudeEnv, getPublicRuntimeConfig } from "./config.js";
import { findMentionedMember } from "./teamConfig.js";

function cleanChunk(value) {
  return stripAnsi(value).replace(/\r/g, "");
}

function isLikelyFollowUp(prompt) {
  const normalized = String(prompt ?? "").trim();
  const wordCount = normalized.split(/\s+/).filter(Boolean).length;

  return [
    wordCount <= 8,
    /^(evet|hayir|tamam|olur|olsun|sade|sekersiz|şekersiz|detaylandir|detaylandır|devam|peki|neden|nasil|nasıl)\b/i.test(normalized)
  ].some(Boolean);
}

function buildRoutedPrompt(prompt, lastDirectedMember = null) {
  const explicitTarget = findMentionedMember(prompt);
  const targetMember = explicitTarget ?? (lastDirectedMember && isLikelyFollowUp(prompt) ? lastDirectedMember : null);

  if (!targetMember) {
    return {
      targetMember: null,
      routedPrompt: `Not: Bu genel mesajdir. Once Mazlum cevap versin ve konusan herkes ad etiketi kullansin. Irgatov teknik gorev almaz; sadece kahve ve lojistik destek verir. Kullanici mesaji: ${prompt}`
    };
  }

  if (targetMember.name === "Irgatov") {
    return {
      targetMember,
      routedPrompt: `Not: Bu mesaj Irgatov icindir. Irgatov sadece kahve, icecek, servis ve basit lojistik destek konularinda cevap versin. Teknik plan, kod, mimari veya dosya yapisi onermesin. Cevap \`Irgatov:\` ile baslasin. Kullanici mesaji: ${prompt}`
    };
  }

  return {
    targetMember,
    routedPrompt: `Not: Bu mesaj ${targetMember.name} icindir. Yalnizca ${targetMember.name} cevap versin ve cevap \`${targetMember.name}:\` ile baslasin. Kullanici mesaji: ${prompt}`
  };
}

export class SessionManager {
  constructor({ io, config }) {
    this.io = io;
    this.config = config;
    this.logService = new LogService(config.watchLogLimit, config.logToConsole ? console : null);
    this.ptyService = null;
    this.chatOutput = "";
    this.lastDirectedMember = null;
    this.currentProjectPath = null;
    this.state = {
      status: "idle",
      startedAt: null,
      teamActivated: false,
      lastError: null,
      currentProjectPath: null,
      runtime: getPublicRuntimeConfig(config)
    };
  }

  getState() {
    return {
      ...this.state,
      currentProjectPath: this.currentProjectPath,
      runtime: getPublicRuntimeConfig(this.config)
    };
  }

  getLogSnapshot() {
    return this.logService.snapshot();
  }

  getChatSnapshot() {
    return this.chatOutput;
  }

  emitState() {
    this.io.emit("session:state", this.getState());
  }

  emitLog(entry) {
    this.io.emit("log:entry", entry);
  }

  emitChat(chunk) {
    this.io.emit("chat:chunk", { chunk });
  }

  addLog(type, message, meta = {}) {
    const entry = this.logService.push(type, message, meta);
    this.emitLog(entry);
    return entry;
  }

  setState(patch) {
    this.state = {
      ...this.state,
      ...patch
    };
    this.emitState();
  }

  getActiveWorkspaceDir() {
    return this.currentProjectPath ?? this.config.workspaceDir;
  }

  async setProjectPath(projectPath) {
    const resolved = projectPath ? path.resolve(projectPath) : null;
    const wasRunning = this.ptyService?.isRunning() ?? false;

    if (resolved && (!fs.existsSync(resolved) || !fs.statSync(resolved).isDirectory())) {
      throw new Error(`Selected project path is invalid: ${resolved}`);
    }

    if (wasRunning) {
      await this.stop();
    }

    this.currentProjectPath = resolved;
    this.lastDirectedMember = null;
    this.setState({ currentProjectPath: resolved });
    this.addLog("system", `Current project set to ${resolved ?? "None"}`);

    if (wasRunning) {
      await this.start();

      if (resolved) {
        await this.activateTeam();
      } else {
        const prompt = buildProjectSelectionPrompt(this.getActiveWorkspaceDir());
        await this.sendRawPrompt(prompt, { label: `[project] Switched active project to ${this.getActiveWorkspaceDir()}` });
      }
    }
  }

  async start() {
    if (this.ptyService?.isRunning()) {
      throw new Error("Session is already running");
    }

    this.chatOutput = "";
    this.lastDirectedMember = null;
    this.logService.clear();
    this.io.emit("chat:reset");

    this.ptyService = new PtyService({
      cwd: this.getActiveWorkspaceDir(),
      env: getClaudeEnv(this.config)
    });

    this.setState({
      status: "starting",
      startedAt: new Date().toISOString(),
      teamActivated: false,
      lastError: null
    });

    this.addLog("lifecycle", `Starting Claude session in ${this.getActiveWorkspaceDir()}`);

    try {
      await this.ptyService.start({
        command: this.config.claudeBin,
        args: this.config.claudeArgs,
        onData: (chunk) => this.handlePtyData(chunk),
        onExit: (event) => this.handlePtyExit(event)
      });
      this.setState({ status: "running" });
      this.addLog("lifecycle", `Claude process started with binary ${this.config.claudeBin}`);
    } catch (error) {
      this.setState({
        status: "error",
        lastError: error.message
      });
      this.addLog("error", error.message);
      throw error;
    }
  }

  async stop() {
    if (!this.ptyService?.isRunning()) {
      return;
    }

    this.addLog("lifecycle", "Stopping Claude session");
    await this.ptyService.stop();
    this.lastDirectedMember = null;
    this.setState({
      status: "stopped",
      teamActivated: false
    });
  }

  async sendPrompt(prompt) {
    if (!this.ptyService?.isRunning()) {
      throw new Error("Session is not running");
    }

    const { routedPrompt, targetMember } = buildRoutedPrompt(prompt, this.lastDirectedMember);
    const input = `${routedPrompt}\r`;
    this.lastDirectedMember = targetMember ?? null;
    this.addLog("input", prompt);
    await this.ptyService.write(input);
  }

  async sendRawPrompt(prompt, meta = {}) {
    if (!this.ptyService?.isRunning()) {
      throw new Error("Session is not running");
    }

    const input = `${prompt}\r`;
    this.addLog("input", meta.label ?? prompt, meta);
    await this.ptyService.write(input);
  }

  async activateTeam() {
    const prompt = buildBootstrapPrompt(this.currentProjectPath);
    this.lastDirectedMember = null;
    await this.sendRawPrompt(prompt, { label: "[bootstrap] Team activation prompt sent" });
    this.setState({ teamActivated: true });
    this.addLog("system", "Team activation prompt sent");
  }

  resize({ cols, rows }) {
    this.ptyService?.resize(cols, rows);
  }

  clearLogs() {
    this.logService.clear();
    this.io.emit("log:snapshot", []);
    this.addLog("system", "Watch log cleared");
  }

  handlePtyData(chunk) {
    const clean = cleanChunk(chunk);
    if (!clean) {
      return;
    }

    this.chatOutput += clean;
    if (this.chatOutput.length > this.config.chatChunkLimit * 20) {
      this.chatOutput = this.chatOutput.slice(-this.config.chatChunkLimit * 20);
    }

    this.emitChat(clean);
    this.addLog("output", clean);
  }

  handlePtyExit(event) {
    const exitCode = event?.exitCode ?? 0;
    const signal = event?.signal ?? 0;
    const detail = event?.error ? `, error=${event.error}` : "";
    this.addLog("lifecycle", `Claude session exited (code=${exitCode}, signal=${signal}${detail})`);
    this.setState({
      status: "stopped",
      teamActivated: false
    });
    this.ptyService = null;
  }
}