import { api } from "./api";
import { wizardApi } from "./wizardApi";
import { chatApi } from "./chatApi";
import { curatedPublishedFlows, fetchStartableFlows } from "./flowCuration";

export interface ToolResult {
  ok: boolean;
  display: string;
  action?: { kind: "navigate"; scene: string };
  data?: any;
}

export interface ToolContext {
  navigate: (scene: string) => void;
  userEmail: string;
}

interface ToolDef {
  name: string;
  description: string;
  matcher: RegExp;
  run: (input: string, ctx: ToolContext) => Promise<ToolResult>;
}

const TOOLS: ToolDef[] = [
  {
    name: "navigate",
    description: "Open a section of FlowMaster — mission, runs, studio, chat, settings, hubs",
    matcher: /^(go to|open|show me|navigate to|take me to)\s+(.+)$/i,
    async run(input, ctx) {
      const m = input.match(/^(go to|open|show me|navigate to|take me to)\s+(.+)$/i);
      const dest = m?.[2]?.toLowerCase().trim().replace(/[.!?]+$/, "") || "";
      const map: Record<string, string> = {
        mission: "mission",
        "mission control": "mission",
        runs: "history",
        "run history": "history",
        history: "history",
        studio: "studio",
        wizard: "studio",
        chat: "chat",
        settings: "settings",
        home: "landing",
        landing: "landing",
        procurement: "hub-procurement",
        "procurement hub": "hub-procurement",
        hr: "hub-hr",
        "hr hub": "hub-hr",
        it: "hub-it",
        "it hub": "hub-it",
        attendance: "geo-attendance",
        "geo attendance": "geo-attendance",
        explainer: "explainer",
        "what is flowmaster": "explainer",
      };
      const target = map[dest];
      if (!target) return { ok: false, display: `I don't know where "${dest}" is. Try: mission, runs, studio, chat, procurement hub, HR hub, IT hub, attendance.` };
      ctx.navigate(target);
      return { ok: true, display: `Opened ${dest}.`, action: { kind: "navigate", scene: target } };
    },
  },
  {
    name: "start_process",
    description: "Start a process instance",
    matcher: /^(start|run|kick off|trigger)\s+(.+)$/i,
    async run(input, _ctx) {
      const m = input.match(/^(start|run|kick off|trigger)\s+(.+)$/i);
      const phrase = m?.[2] || "";
      const subjectMatch = phrase.match(/^(.*?)\s+(for|on|about)\s+(.+)$/i);
      const processName = subjectMatch ? subjectMatch[1] : phrase;
      const subject = subjectMatch ? subjectMatch[3] : undefined;

      const token = sessionStorage.getItem("fm.mc.token.v1") || "";
      const procs = await fetch(`${api.config.baseUrl}/api/ea2/flow/processes?limit=500`, {
        headers: { Authorization: `Bearer ${token}` },
      }).then((r) => r.json());
      const fromList = curatedPublishedFlows((procs?.items || []) as any[]);
      const directHits = await fetchStartableFlows(api.config.baseUrl, token);
      const items = (() => {
        const m = new Map<string, any>();
        for (const it of [...directHits, ...fromList]) m.set(it._key, it);
        return Array.from(m.values());
      })();
      const norm = (s: string) => s.toLowerCase().replace(/[^a-z0-9]+/g, " ").trim();
      const target = norm(processName);
      const match = items.find((it) => norm(it.display_name || "").includes(target) || norm(it.name || "").includes(target));

      if (!match) return { ok: false, display: `Couldn't find a published process matching "${processName}". Try the Studio to create one.` };
      try {
        const res = await wizardApi.startInstance(match._key, subject);
        return {
          ok: true,
          display: `Started ${match.display_name}${subject ? ` for ${subject}` : ""}.`,
          data: res,
        };
      } catch (e: any) {
        return { ok: false, display: `Start failed: ${e.message}` };
      }
    },
  },
  {
    name: "send_chat",
    description: "Send a chat message to a teammate",
    matcher: /^(message|tell|text|ask)\s+(.+?)\s+(that|about|:)\s+(.+)$/i,
    async run(input, ctx) {
      const m = input.match(/^(message|tell|text|ask)\s+(.+?)\s+(that|about|:)\s+(.+)$/i);
      if (!m) return { ok: false, display: "Try: message Mariana that the laptop quote is approved" };
      const target = m[2].toLowerCase();
      const body = m[4];
      const directory: Record<string, string> = {
        mariana: "ceo-head@flow-master.ai", ceo: "ceo-head@flow-master.ai",
        aisha: "hr-head@flow-master.ai", hr: "hr-head@flow-master.ai",
        rohan: "it-head@flow-master.ai", it: "it-head@flow-master.ai",
      };
      const recipient = Object.entries(directory).find(([k]) => target.includes(k))?.[1];
      if (!recipient) return { ok: false, display: `I don't know who "${target}" is. Try Mariana, Aisha, or Rohan.` };
      const threads = await chatApi.listThreads(ctx.userEmail);
      const existing = threads.find((t) => t.participants.includes(recipient) && t.participants.includes(ctx.userEmail));
      const threadKey = existing?._key || (await chatApi.createThread(`${ctx.userEmail} ↔ ${recipient}`, [ctx.userEmail, recipient]));
      await chatApi.sendMessage(threadKey, body, ctx.userEmail);
      return { ok: true, display: `Sent to ${recipient.split("@")[0]}: "${body}".` };
    },
  },
  {
    name: "create_process",
    description: "Open the Process Creation Wizard to build a new process",
    matcher: /^(create|new|design|build)\s+(a\s+)?(process|workflow|flow)/i,
    async run(_input, ctx) {
      ctx.navigate("studio");
      return { ok: true, display: "Opened the Process Creation Wizard. Describe the process and I'll seed the structure.", action: { kind: "navigate", scene: "studio" } };
    },
  },
  {
    name: "list_processes",
    description: "List published processes for this tenant",
    matcher: /^(list|show|what)\s+(processes|workflows|flows)/i,
    async run() {
      const token = sessionStorage.getItem("fm.mc.token.v1") || "";
      const procs = await fetch(`${api.config.baseUrl}/api/ea2/flow/processes?limit=500`, {
        headers: { Authorization: `Bearer ${token}` },
      })
        .then((r) => r.json())
        .catch(() => ({ items: [] }));
      const fromList = curatedPublishedFlows((procs?.items || []) as any[]);
      const directHits = await fetchStartableFlows(api.config.baseUrl, token);
      const merged = new Map<string, any>();
      for (const it of [...directHits, ...fromList]) merged.set(it._key, it);
      const published = Array.from(merged.values()).slice(0, 10);
      if (!published.length) return { ok: true, display: "No published processes yet. Open the Studio to design one." };
      const lines = published.map((it) => `• ${it.display_name}`).join("\n");
      return { ok: true, display: `Here's what's published:\n${lines}` };
    },
  },
];

export async function routeAgentInput(text: string, ctx: ToolContext): Promise<ToolResult> {
  const trimmed = text.trim();
  if (!trimmed) return { ok: false, display: "Tell me what to do." };
  for (const tool of TOOLS) {
    if (tool.matcher.test(trimmed)) {
      try {
        return await tool.run(trimmed, ctx);
      } catch (e: any) {
        return { ok: false, display: `${tool.name} failed: ${e.message || e}` };
      }
    }
  }
  return {
    ok: false,
    display:
      "I can: navigate (e.g. 'open mission'), start a process ('run laptop procurement for store-204'), message a teammate ('tell Rohan that...'), list processes, or open the wizard ('create a new process').",
  };
}

export function agentToolList(): { name: string; description: string }[] {
  return TOOLS.map((t) => ({ name: t.name, description: t.description }));
}