import { useState, useCallback } from 'react';
import { useCVMClient } from '@/hooks/useCVMClient';
import { callSasquatchAI, parseToolCall, type ChatTurn } from '@/lib/sasquatchBrain';

export interface CrewAgentMessage {
  id: string;
  role: 'user' | 'agent';
  text: string;
  timestamp: number;
  /** Raw structured tool result, so the UI can render receipt cards. */
  receipts?: { tool: string; data: unknown };
}

/** A crew-hosted event, flattened for the agent's context. */
export interface CrewAgentEvent {
  title: string;
  /** Unix seconds. */
  start: number;
  location?: string;
  /** In-app path to the event, e.g. /event/<pubkey>/<d>. */
  path?: string;
}

/** A recent crew-feed post, flattened for the agent's context. */
export interface CrewAgentPost {
  author: string;
  /** Short excerpt of the note. */
  text: string;
  /** Unix seconds. */
  createdAt: number;
}

export interface CrewContext {
  crewName: string;
  location?: string;
  /** City derived from location (best-effort) — helps seed CVM queries. */
  city?: string;
  /** Freeform crew manifesto / about. */
  bio?: string;
  /** Style / focus tags. */
  vibes?: string[];
  /** Founder display name. */
  founderName?: string;
  /** Total member count (founder + listed members). */
  memberCount?: number;
  /** Human-readable open-call labels, e.g. ["Filmer", "New Members"]. */
  lookingFor?: string[];
  /** Crew band name, if the crew doubles as a music project. */
  bandName?: string;
  /** Number of home spots linked to the crew. */
  homeSpotCount?: number;
  /** Crew website. */
  website?: string;
  /** Crew Instagram handle. */
  instagram?: string;
  /** The crew's OWN upcoming/recent events — soonest first. */
  events?: CrewAgentEvent[];
  /** A short digest of the crew's recent feed activity. */
  recentPosts?: CrewAgentPost[];
}

function fmtDate(unix: number): string {
  try {
    return new Date(unix * 1000).toLocaleDateString(undefined, {
      weekday: 'short',
      month: 'short',
      day: 'numeric',
    });
  } catch {
    return 'TBD';
  }
}

/**
 * Build a compact, human-readable digest of everything Sasquatch knows about
 * THIS crew. This is the crew's "memory" — the stuff no global bot could know —
 * and is injected into every turn so the agent answers crew questions directly.
 */
function buildCrewDossier(ctx: CrewContext): string {
  const lines: string[] = [];
  const where = ctx.location || 'unknown';

  lines.push(`Crew name: ${ctx.crewName}`);
  lines.push(`Home turf: ${where}`);
  if (ctx.founderName) lines.push(`Founded/run by: ${ctx.founderName}`);
  if (typeof ctx.memberCount === 'number') {
    lines.push(`Roster size: ${ctx.memberCount} ${ctx.memberCount === 1 ? 'member' : 'members'}`);
  }
  if (ctx.vibes?.length) lines.push(`Vibe / style: ${ctx.vibes.join(', ')}`);
  if (ctx.bio) lines.push(`About: ${ctx.bio.slice(0, 400)}`);
  if (ctx.bandName) lines.push(`Crew band: ${ctx.bandName}`);
  if (typeof ctx.homeSpotCount === 'number' && ctx.homeSpotCount > 0) {
    lines.push(`Home spots on file: ${ctx.homeSpotCount}`);
  }
  if (ctx.lookingFor?.length) {
    lines.push(`Open call — the crew is looking for: ${ctx.lookingFor.join(', ')}`);
  }
  if (ctx.website) lines.push(`Website: ${ctx.website}`);
  if (ctx.instagram) lines.push(`Instagram: @${ctx.instagram.replace('@', '')}`);

  // The crew's OWN events — the highest-value crew-specific data.
  if (ctx.events?.length) {
    const now = Math.floor(Date.now() / 1000);
    const upcoming = ctx.events.filter((e) => e.start >= now);
    const list = (upcoming.length ? upcoming : ctx.events).slice(0, 6);
    lines.push(
      `\nCrew's own events (${upcoming.length ? 'upcoming' : 'most recent'}):`,
    );
    for (const e of list) {
      const loc = e.location ? ` @ ${e.location}` : '';
      lines.push(`- "${e.title}" — ${fmtDate(e.start)}${loc}`);
    }
  } else {
    lines.push('\nCrew events: none hosted yet.');
  }

  // Recent feed digest — gives the agent a sense of what the crew is up to.
  if (ctx.recentPosts?.length) {
    lines.push('\nRecent crew feed activity:');
    for (const p of ctx.recentPosts.slice(0, 5)) {
      lines.push(`- ${p.author}: "${p.text.slice(0, 120).replace(/\s+/g, ' ')}"`);
    }
  }

  return lines.join('\n');
}

function buildCrewSystemPrompt(ctx: CrewContext): string {
  const where = ctx.city || ctx.location || 'their local area';
  const dossier = buildCrewDossier(ctx);

  return `You are Sasquatch, the AI guide for the "${ctx.crewName}" skate crew on SkateSpots (a decentralized skateboarding platform on Nostr). You're chatting inside the crew's own page with its members. Chill, skater-friendly, concise, and you know THIS crew personally.

## What you know about this crew (your memory)
${dossier}

When a member asks about "us", "our crew", "here", "our next jam", "who runs this", "what are we looking for", "our vibe", etc. — answer DIRECTLY from the crew memory above. Do NOT call a tool for questions about the crew itself. If the memory doesn't cover it, say so honestly.

## Tools — for discovering things OUTSIDE the crew (the wider SkateSpots network).
Respond with ONLY a JSON tool call when you need external data, nothing else on that line:
{"tool":"<name>","args":{}}

- find_spots — args: city?, country?, difficulty?, features?(string[]), search?, limit?
- find_events — args: city?, country?, event_type?, from_date?, to_date?, limit?
- find_coaches — args: role?("coach"|"filmer"|"editor"|"any"), skills?(string[]), location?, limit?
- find_gear — args: category?, condition?, max_price_sats?, search?, limit?
- find_crews — args: city?, country?, vibe?, search?, limit?
- get_community_stats — args: none
- get_weather — args: city (required)

Rules:
1. Questions about THIS crew (its events, roster, vibe, open call, founder, band, home spots, website) → answer from memory, NO tool.
2. Questions about the wider scene (spots/events/coaches/gear/crews near us, stats, weather) → ALWAYS use a tool, never guess. Seed local queries with the crew's city (${where}) and limit:20.
3. A tool call is ONE JSON object on its own line — nothing else.
4. Be concise and skater-friendly. Never invent spot names, dates, member names, or user data.
5. 0 results (or empty crew data) = honest "none listed yet" + encourage adding content at skate-spots.org.`;
}

/**
 * Crew-scoped Sasquatch chat. Reuses the CVM data tools and the shared AI
 * brain, but is seeded with a rich, crew-specific dossier (its own events,
 * feed digest, roster, open call, vibe, band, home spots) so it can answer
 * questions about the crew itself directly — not just re-skin the global bot.
 * Ephemeral/local — no keys, no publishing. Answers can carry structured
 * `receipts` so the UI renders spot / Lab / event cards.
 */
export function useCrewAgentChat(ctx: CrewContext) {
  const cvm = useCVMClient();
  const [messages, setMessages] = useState<CrewAgentMessage[]>([]);
  const [isThinking, setIsThinking] = useState(false);

  const append = useCallback((m: Omit<CrewAgentMessage, 'id' | 'timestamp'>) => {
    setMessages((prev) => [
      ...prev,
      { ...m, id: `${Date.now()}_${Math.random().toString(36).slice(2, 8)}`, timestamp: Date.now() },
    ]);
  }, []);

  const runTool = useCallback(
    async (tool: string, args: Record<string, unknown>): Promise<unknown> => {
      switch (tool) {
        case 'find_spots':
          return cvm.findSpots(args as Parameters<typeof cvm.findSpots>[0]);
        case 'find_events':
          return cvm.findEvents(args as Parameters<typeof cvm.findEvents>[0]);
        case 'find_coaches':
          return cvm.findCoaches(args as Parameters<typeof cvm.findCoaches>[0]);
        case 'find_gear':
          return cvm.findGear(args as Parameters<typeof cvm.findGear>[0]);
        case 'find_crews':
          return cvm.findCrews(args as Parameters<typeof cvm.findCrews>[0]);
        case 'get_community_stats':
          return cvm.getCommunityStats();
        default:
          return { error: `Unknown tool: ${tool}` };
      }
    },
    [cvm],
  );

  const send = useCallback(
    async (question: string) => {
      const q = question.trim();
      if (!q || isThinking) return;
      setIsThinking(true);
      append({ role: 'user', text: q });

      try {
        const system = buildCrewSystemPrompt(ctx);
        // First pass — AI answers directly from crew memory or emits a tool call.
        const firstPass: ChatTurn[] = [
          { role: 'user', content: `${system}\n\n---\n\nMember: ${q}` },
        ];
        const aiText = await callSasquatchAI(firstPass);
        const toolCall = parseToolCall(aiText);

        if (!toolCall) {
          append({ role: 'agent', text: aiText || "Hmm, couldn't process that. Try rephrasing!" });
          return;
        }

        // Run the tool, then a second pass to present the data naturally.
        let toolResult: unknown;
        try {
          toolResult = await runTool(toolCall.tool, toolCall.args);
        } catch (toolErr) {
          console.warn('[CrewAgent] tool failed:', toolErr);
          append({
            role: 'agent',
            text: "Couldn't reach the live data right now — try again in a moment. 🛹",
          });
          return;
        }

        const presented = await callSasquatchAI([
          {
            role: 'user',
            content: `You are Sasquatch, guide for the "${ctx.crewName}" crew. Present this live data to the crew member naturally and concisely. Do NOT output any JSON. Plain conversational text with short bullet points.

Member asked: "${q}"

Live data from ${toolCall.tool}:
${JSON.stringify(toolResult, null, 2)}

- If count is 0: say nothing found yet, encourage adding at skate-spots.org
- If count > 0: a short intro line — the app shows the results as cards below your message
- Keep it short and skater-friendly. Never invent data.`,
          },
        ]);

        append({
          role: 'agent',
          text: presented || 'Here you go 👇',
          receipts: { tool: toolCall.tool, data: toolResult },
        });
      } catch (err) {
        console.warn('[CrewAgent] AI unavailable:', err);
        append({
          role: 'agent',
          text: "The AI's a bit slow right now (free tier limits). Try again in a moment, or check the 🗺️ Map. 🛹",
        });
      } finally {
        setIsThinking(false);
      }
    },
    [ctx, isThinking, append, runTool],
  );

  return { messages, isThinking, send };
}