/**
 * MCP JSON-RPC 2.0 handler for bot.arikigame.
 *
 * Implements Streamable HTTP transport (POST /api/mcp).
 * Resources: tinqs://identity/*, tinqs://glossary/*
 * Tools: get_identity, get_glossary, get_handoff, get_repo_file, search_docs,
 *        list_skills, get_skill, gitea_api, gh_api,
 *        list_active_meetings, get_live_transcript, query_meeting
 */

import { fetchFile, listDir, searchCode, listRepos } from "./gitea";
import { listGatewayPages, getGatewayPage } from "./gateway";
import { BedrockRuntimeClient, InvokeModelCommand } from "@aws-sdk/client-bedrock-runtime";
import { listActiveMeetings, getMostRecentSessionId, getTranscript } from "./store";
import { getLastNMinutes, formatTranscript } from "./transcript";
import { callTacoClaude } from "./claude";

// --- Types ---

interface JsonRpcRequest {
  jsonrpc: "2.0";
  id: string | number;
  method: string;
  params?: Record<string, unknown>;
}

interface JsonRpcResponse {
  jsonrpc: "2.0";
  id: string | number;
  result?: unknown;
  error?: { code: number; message: string; data?: unknown };
}

// --- Resource definitions ---

const IDENTITY_FILES: Record<string, { repo: string; path: string; cache: number }> = {
  soul: { repo: "tinqs-ltd/docs", path: "ai/SOUL.md", cache: 300 },
  company: { repo: "tinqs-ltd/docs", path: "ai/company.md", cache: 300 },
  siblings: { repo: "tinqs-ltd/docs", path: "ai/siblings.md", cache: 300 },
  urls: { repo: "tinqs-ltd/docs", path: "ai/urls.md", cache: 300 },
  handoff: { repo: "tinqs-ltd/docs", path: "ai/handoff.md", cache: 60 },
  gateway: { repo: "tinqs-ltd/docs", path: "ai/gateway.md", cache: 300 },
};

// --- MCP Protocol ---

const TOOLS = [
  {
    name: "get_identity",
    description: "Returns combined hub identity: SOUL + company + siblings + urls. Call this first on session start.",
    inputSchema: { type: "object" as const, properties: {}, required: [] as string[] },
  },
  {
    name: "get_glossary",
    description: "Returns speech-to-text glossary corrections for a specific user.",
    inputSchema: {
      type: "object" as const,
      properties: { user: { type: "string", description: "User name (e.g. 'ozan', 'ozlem', 'jeremy')" } },
      required: ["user"],
    },
  },
  {
    name: "get_handoff",
    description: "Returns pending handoff tasks, optionally filtered by repo.",
    inputSchema: {
      type: "object" as const,
      properties: { repo: { type: "string", description: "Optional: filter tasks mentioning this repo" } },
      required: [] as string[],
    },
  },
  {
    name: "get_repo_file",
    description: "Read any file from any repo on Git Studio.",
    inputSchema: {
      type: "object" as const,
      properties: {
        repo: { type: "string", description: "Full repo path, e.g. 'tinqs-ltd/docs'" },
        path: { type: "string", description: "File path within repo, e.g. 'ai/SOUL.md'" },
      },
      required: ["repo", "path"],
    },
  },
  {
    name: "list_skills",
    description: "List all shared skills available from the docs repo.",
    inputSchema: { type: "object" as const, properties: {}, required: [] as string[] },
  },
  {
    name: "get_skill",
    description: "Get full SKILL.md content for a specific shared skill.",
    inputSchema: {
      type: "object" as const,
      properties: { name: { type: "string", description: "Skill directory name" } },
      required: ["name"],
    },
  },
  {
    name: "search_docs",
    description: "Search across all Tinqs repos on Git Studio. Returns matching repos and file paths.",
    inputSchema: {
      type: "object" as const,
      properties: {
        query: { type: "string", description: "Search query" },
        repo: { type: "string", description: "Optional: limit search to a specific repo (e.g. 'tinqs-ltd/isleborn')" },
        limit: { type: "number", description: "Max results (default 20)" },
      },
      required: ["query"],
    },
  },
  {
    name: "list_all_repos",
    description: "List all repos on Git Studio with descriptions. Helps agents discover available repos.",
    inputSchema: { type: "object" as const, properties: {}, required: [] as string[] },
  },
  {
    name: "gitea_api",
    description: "Proxy any Gitea API call to Git Studio.",
    inputSchema: {
      type: "object" as const,
      properties: {
        method: { type: "string", enum: ["GET", "POST", "PUT", "DELETE", "PATCH"], description: "HTTP method" },
        path: { type: "string", description: "API path after /api/v1, e.g. '/repos/tinqs-ltd/docs/issues'" },
        body: { type: "object", description: "Optional request body for POST/PUT/PATCH" },
      },
      required: ["method", "path"],
    },
  },
  {
    name: "gh_api",
    description: "Proxy any GitHub API call.",
    inputSchema: {
      type: "object" as const,
      properties: {
        method: { type: "string", enum: ["GET", "POST", "PUT", "DELETE", "PATCH"], description: "HTTP method" },
        path: { type: "string", description: "API path, e.g. '/repos/tinqs-ltd/website/issues'" },
        body: { type: "object", description: "Optional request body for POST/PUT/PATCH" },
      },
      required: ["method", "path"],
    },
  },
  {
    name: "eval_agent",
    description: "Grade an agent's answer against a rubric using Bedrock LLM-as-judge. Fetches rubrics from tinqs-ltd/agent-eval repo. Returns a score 1-5 with reasoning.",
    inputSchema: {
      type: "object" as const,
      properties: {
        rubric_id: { type: "string", description: "Rubric ID, e.g. 'docs/q1-melih'. Use list_rubrics to see all available." },
        agent_answer: { type: "string", description: "The agent's answer text to grade." },
      },
      required: ["rubric_id", "agent_answer"],
    },
  },
  {
    name: "list_rubrics",
    description: "List all available eval rubrics from the agent-eval repo.",
    inputSchema: { type: "object" as const, properties: {}, required: [] as string[] },
  },
  {
    name: "run_eval",
    description: "Run all docs rubrics against the MCP's own get_identity output. Self-test: calls get_identity, feeds it to Bedrock as the 'agent answer', scores each rubric. Returns full scorecard.",
    inputSchema: { type: "object" as const, properties: {}, required: [] as string[] },
  },
  {
    name: "list_gateway_pages",
    description: "List all gateway HTML/MD pages across all Tinqs repos. Each repo's gateway/ folder is aggregated.",
    inputSchema: { type: "object" as const, properties: {}, required: [] as string[] },
  },
  {
    name: "get_gateway_page",
    description: "Fetch a gateway page by slug. Returns the full HTML/MD content with parsed frontmatter.",
    inputSchema: {
      type: "object" as const,
      properties: {
        slug: { type: "string", description: "Page slug, e.g. 'docs--onboarding'. Use list_gateway_pages to see all slugs." },
      },
      required: ["slug"],
    },
  },
  {
    name: "list_active_meetings",
    description: "List currently active meeting sessions being recorded by team members.",
    inputSchema: { type: "object" as const, properties: {}, required: [] as string[] },
  },
  {
    name: "get_live_transcript",
    description: "Get the live rolling transcript from an active meeting session. Returns speaker-labeled, timestamped text.",
    inputSchema: {
      type: "object" as const,
      properties: {
        session_id: { type: "string", description: "Meeting session ID. If omitted, uses the most recent active session." },
      },
      required: [] as string[],
    },
  },
  {
    name: "query_meeting",
    description: "Ask a question about an ongoing meeting and get an AI-powered answer based on the live transcript.",
    inputSchema: {
      type: "object" as const,
      properties: {
        question: { type: "string", description: "Question to answer from the meeting transcript." },
        session_id: { type: "string", description: "Meeting session ID. If omitted, uses the most recent active session." },
      },
      required: ["question"],
    },
  },
];

const RESOURCES = [
  { uri: "tinqs://identity/soul", name: "Hub SOUL", description: "Tinqs shared identity", mimeType: "text/markdown" },
  { uri: "tinqs://identity/company", name: "Company", description: "Team roster, machines, values", mimeType: "text/markdown" },
  { uri: "tinqs://identity/siblings", name: "Siblings", description: "All repos and agents", mimeType: "text/markdown" },
  { uri: "tinqs://identity/urls", name: "URLs", description: "Service URLs", mimeType: "text/markdown" },
  { uri: "tinqs://identity/handoff", name: "Handoff", description: "Cross-machine task queue", mimeType: "text/markdown" },
  { uri: "tinqs://identity/gateway", name: "Gateway", description: "Gateway capabilities", mimeType: "text/markdown" },
];

// --- Tool handlers ---

async function handleGetIdentity(): Promise<string> {
  const parts = await Promise.all([
    fetchFile("tinqs-ltd/docs", "ai/SOUL.md", 300),
    fetchFile("tinqs-ltd/docs", "ai/company.md", 300),
    fetchFile("tinqs-ltd/docs", "ai/siblings.md", 300),
    fetchFile("tinqs-ltd/docs", "ai/urls.md", 300),
  ]);
  return parts.join("\n\n---\n\n");
}

async function handleGetGlossary(user: string): Promise<string> {
  return fetchFile("tinqs-ltd/docs", `.cursor/glossary/glossary-${user}.md`, 300);
}

async function handleGetHandoff(repo?: string): Promise<string> {
  const content = await fetchFile("tinqs-ltd/docs", "ai/handoff.md", 60);
  if (!repo) return content;
  // Filter to lines mentioning the repo
  const lines = content.split("\n");
  const filtered = lines.filter(
    (l) => l.toLowerCase().includes(repo.toLowerCase()) || l.startsWith("#") || l.startsWith("---")
  );
  return filtered.join("\n");
}

async function handleGetRepoFile(repo: string, path: string): Promise<string> {
  return fetchFile(repo, path, 120);
}

async function handleListSkills(): Promise<string> {
  const entries = await listDir("tinqs-ltd/docs", ".cursor/skills");
  const dirs = entries.filter((e) => e.type === "dir");
  const skills = dirs.map((d) => `- ${d.name}`).join("\n");
  return `# Shared Skills\n\n${skills}`;
}

async function handleGetSkill(name: string): Promise<string> {
  return fetchFile("tinqs-ltd/docs", `.cursor/skills/${name}/SKILL.md`, 300);
}

async function handleSearchDocs(query: string, repo?: string, limit?: number): Promise<string> {
  const results = await searchCode(query, { repo, limit: limit ?? 20 });
  if (results.length === 0) return "No results found.";
  const lines = results.map((r) => {
    if (r.path) return `- **${r.repo}** / \`${r.path}\`${r.content ? " — " + r.content : ""}`;
    return `- **${r.repo}**${r.content ? " — " + r.content : ""}`;
  });
  return `# Search: "${query}"\n\n${lines.join("\n")}`;
}

async function handleListAllRepos(): Promise<string> {
  const repos = await listRepos();
  const lines = repos.map((r) =>
    `- **${r.full_name}**${r.private ? " (private)" : ""} — ${r.description || "no description"}`
  );
  return `# Repos on Git Studio\n\n${lines.join("\n")}`;
}

async function handleGiteaApi(
  method: string,
  path: string,
  body?: Record<string, unknown>
): Promise<string> {
  const token = process.env.GITEA_TOKEN?.trim();
  if (!token) throw new Error("GITEA_TOKEN not set");

  const url = `https://tinqs.com/api/v1${path}`;
  const opts: RequestInit = {
    method,
    headers: {
      Authorization: `token ${token}`,
      "Content-Type": "application/json",
    },
    signal: AbortSignal.timeout(15000),
  };
  if (body && ["POST", "PUT", "PATCH"].includes(method)) {
    opts.body = JSON.stringify(body);
  }

  const r = await fetch(url, opts);
  const text = await r.text();
  if (!r.ok) throw new Error(`Gitea ${r.status}: ${text.slice(0, 500)}`);
  return text;
}

async function handleGhApi(
  method: string,
  path: string,
  body?: Record<string, unknown>
): Promise<string> {
  const token = process.env.GITHUB_TOKEN?.trim();
  if (!token) throw new Error("GITHUB_TOKEN not set");

  const url = `https://api.github.com${path}`;
  const opts: RequestInit = {
    method,
    headers: {
      Authorization: `Bearer ${token}`,
      Accept: "application/vnd.github+json",
      "Content-Type": "application/json",
    },
    signal: AbortSignal.timeout(15000),
  };
  if (body && ["POST", "PUT", "PATCH"].includes(method)) {
    opts.body = JSON.stringify(body);
  }

  const r = await fetch(url, opts);
  const text = await r.text();
  if (!r.ok) throw new Error(`GitHub ${r.status}: ${text.slice(0, 500)}`);
  return text;
}

// --- Bedrock judge ---

async function bedrockJudge(rubricYaml: string, agentAnswer: string): Promise<string> {
  const region = process.env.AWS_REGION ?? "eu-west-1";
  const model = process.env.BEDROCK_JUDGE_MODEL ?? "mistral.mistral-large-2402-v1:0";
  const client = new BedrockRuntimeClient({ region });

  const prompt = `You are an LLM-as-judge. You grade whether an AI agent's context data contains the facts needed to answer a question.

RUBRIC (question + expected facts + scoring criteria):
${rubricYaml}

AGENT'S CONTEXT DATA (this is what the agent received from an MCP call — search it carefully for each golden fact):
${agentAnswer.slice(0, 12000)}

TASK: Search the context data above for each golden fact listed in the rubric. A fact counts as present if the information is there, even if worded differently. Then score 1-5 per the rubric.

Respond in exactly this format:
SCORE: <1-5>
FOUND: <facts found, comma-separated>
MISSING: <facts not found, or "none">
REASONING: <1 sentence>`;

  const body = JSON.stringify({
    messages: [
      { role: "user", content: prompt },
    ],
    max_tokens: 400,
    temperature: 0.0,
  });

  const command = new InvokeModelCommand({
    modelId: model,
    contentType: "application/json",
    accept: "application/json",
    body: new TextEncoder().encode(body),
  });

  const response = await client.send(command);
  const result = JSON.parse(new TextDecoder().decode(response.body));
  const text = result?.choices?.[0]?.message?.content;
  return text?.trim() ?? "(No response from Bedrock)";
}

async function handleListRubrics(): Promise<string> {
  const dirs = await listDir("tinqs-ltd/agent-eval", "rubrics");
  const results: string[] = ["# Eval Rubrics\n"];
  for (const d of dirs) {
    if (d.type !== "dir") continue;
    const files = await listDir("tinqs-ltd/agent-eval", `rubrics/${d.name}`);
    for (const f of files) {
      if (f.name.endsWith(".yaml")) {
        results.push(`- ${d.name}/${f.name.replace(".yaml", "")}`);
      }
    }
  }
  return results.join("\n");
}

async function handleEvalAgent(rubricId: string, agentAnswer: string): Promise<string> {
  const rubricYaml = await fetchFile("tinqs-ltd/agent-eval", `rubrics/${rubricId}.yaml`, 300);
  const judgment = await bedrockJudge(rubricYaml, agentAnswer);
  return `# Eval: ${rubricId}\n\n${judgment}`;
}

async function handleRunEval(): Promise<string> {
  // Fetch MCP identity data (what an agent gets on session start)
  const identity = await handleGetIdentity();
  const handoff = await handleGetHandoff();

  const allData = identity + "\n\n---\n\n" + handoff;

  // Fetch all docs rubrics
  const rubricFiles = await listDir("tinqs-ltd/agent-eval", "rubrics/docs");
  const results: string[] = ["# MCP Self-Eval — Bedrock Judge\n"];
  let totalScore = 0;
  let count = 0;

  for (const f of rubricFiles) {
    if (!f.name.endsWith(".yaml")) continue;
    const rubricId = `docs/${f.name.replace(".yaml", "")}`;
    try {
      const rubricYaml = await fetchFile("tinqs-ltd/agent-eval", `rubrics/${rubricId}.yaml`, 300);
      const judgment = await bedrockJudge(rubricYaml, allData);

      // Parse score from judgment
      const scoreMatch = judgment.match(/SCORE:\s*(\d)/);
      const score = scoreMatch ? parseInt(scoreMatch[1]) : 0;
      totalScore += score;
      count++;

      results.push(`## ${rubricId} — ${score}/5\n${judgment}\n`);
    } catch (e) {
      const msg = e instanceof Error ? e.message : String(e);
      results.push(`## ${rubricId} — ERROR\n${msg}\n`);
      count++;
    }
  }

  results.push(`---\n**TOTAL: ${totalScore}/${count * 5}  |  AVG: ${(totalScore / count).toFixed(1)}/5  |  ${count} rubrics**`);
  return results.join("\n");
}

// --- Meeting tool handlers ---

const MEETING_TRANSCRIPT_WINDOW_MINUTES = 30;

async function handleListActiveMeetings(): Promise<string> {
  const meetings = await listActiveMeetings();
  if (meetings.length === 0) return "No active meetings.";
  const lines = meetings.map(
    (m) =>
      `- **${m.session_id}** — ${m.user}@${m.machine}, started ${m.started_at}, ${m.transcript_count} chunks`
  );
  return `# Active Meetings (${meetings.length})\n\n${lines.join("\n")}`;
}

async function resolveSessionId(sessionId?: string): Promise<string> {
  if (sessionId) return sessionId;
  const mostRecent = await getMostRecentSessionId();
  if (!mostRecent) throw new Error("No active meeting sessions found.");
  return mostRecent;
}

async function handleGetLiveTranscript(sessionId?: string): Promise<string> {
  const resolved = await resolveSessionId(sessionId);
  const allChunks = await getTranscript(resolved);
  const recent = getLastNMinutes(allChunks, MEETING_TRANSCRIPT_WINDOW_MINUTES);
  const formatted = formatTranscript(recent);
  return `# Live Transcript — ${resolved}\n\n${formatted}`;
}

async function handleQueryMeeting(question: string, sessionId?: string): Promise<string> {
  const resolved = await resolveSessionId(sessionId);
  const allChunks = await getTranscript(resolved);
  const recent = getLastNMinutes(allChunks, MEETING_TRANSCRIPT_WINDOW_MINUTES);
  const transcript = formatTranscript(recent);

  if (recent.length === 0) {
    return `No transcript data available for session ${resolved}.`;
  }

  const answer = await callTacoClaude({
    liveTranscriptBlock: transcript,
    docsBlock: "",
    question,
    source: "chat",
  });

  return `# Meeting Q&A — ${resolved}\n\n**Q:** ${question}\n\n**A:** ${answer}`;
}

// --- Main handler ---

async function handleToolCall(
  name: string,
  args: Record<string, unknown>
): Promise<{ content: Array<{ type: string; text: string }>; isError?: boolean }> {
  try {
    let result: string;
    switch (name) {
      case "get_identity":
        result = await handleGetIdentity();
        break;
      case "get_glossary":
        result = await handleGetGlossary(args.user as string);
        break;
      case "get_handoff":
        result = await handleGetHandoff(args.repo as string | undefined);
        break;
      case "get_repo_file":
        result = await handleGetRepoFile(args.repo as string, args.path as string);
        break;
      case "search_docs":
        result = await handleSearchDocs(args.query as string, args.repo as string | undefined, args.limit as number | undefined);
        break;
      case "list_all_repos":
        result = await handleListAllRepos();
        break;
      case "list_skills":
        result = await handleListSkills();
        break;
      case "get_skill":
        result = await handleGetSkill(args.name as string);
        break;
      case "gitea_api":
        result = await handleGiteaApi(
          args.method as string,
          args.path as string,
          args.body as Record<string, unknown> | undefined
        );
        break;
      case "gh_api":
        result = await handleGhApi(
          args.method as string,
          args.path as string,
          args.body as Record<string, unknown> | undefined
        );
        break;
      case "eval_agent":
        result = await handleEvalAgent(args.rubric_id as string, args.agent_answer as string);
        break;
      case "list_rubrics":
        result = await handleListRubrics();
        break;
      case "run_eval":
        result = await handleRunEval();
        break;
      case "list_gateway_pages": {
        const pages = await listGatewayPages();
        const lines = pages.map((p) =>
          `- **${p.repoKey}** / \`${p.filename}\` — slug: \`${p.slug}\``
        );
        result = `# Gateway Pages (${pages.length})\n\n${lines.join("\n")}`;
        break;
      }
      case "get_gateway_page": {
        const gp = await getGatewayPage(args.slug as string);
        if (!gp) { result = "Page not found"; break; }
        const meta = [
          gp.page.title && `**${gp.page.title}**`,
          gp.page.author && `Author: ${gp.page.author}`,
          gp.page.date && `Date: ${gp.page.date}`,
          gp.page.source && `Source: ${gp.page.source}`,
          gp.page.description,
        ].filter(Boolean).join(" | ");
        result = `${meta}\n\n---\n\n${gp.content}`;
        break;
      }
      case "list_active_meetings":
        result = await handleListActiveMeetings();
        break;
      case "get_live_transcript":
        result = await handleGetLiveTranscript(args.session_id as string | undefined);
        break;
      case "query_meeting":
        result = await handleQueryMeeting(args.question as string, args.session_id as string | undefined);
        break;
      default:
        return { content: [{ type: "text", text: `Unknown tool: ${name}` }], isError: true };
    }
    return { content: [{ type: "text", text: result }] };
  } catch (e) {
    const msg = e instanceof Error ? e.message : String(e);
    return { content: [{ type: "text", text: `Error: ${msg}` }], isError: true };
  }
}

async function handleReadResource(uri: string): Promise<{ contents: Array<{ uri: string; mimeType: string; text: string }> }> {
  // Parse URI: tinqs://identity/soul → identity file
  const match = uri.match(/^tinqs:\/\/(\w+)\/(.+)$/);
  if (!match) throw new Error(`Unknown resource URI: ${uri}`);

  const [, category, name] = match;

  if (category === "identity") {
    const file = IDENTITY_FILES[name];
    if (!file) throw new Error(`Unknown identity resource: ${name}`);
    const text = await fetchFile(file.repo, file.path, file.cache);
    return { contents: [{ uri, mimeType: "text/markdown", text }] };
  }

  if (category === "glossary") {
    const text = await fetchFile("tinqs-ltd/docs", `.cursor/glossary/glossary-${name}.md`, 300);
    return { contents: [{ uri, mimeType: "text/markdown", text }] };
  }

  throw new Error(`Unknown resource category: ${category}`);
}

// --- JSON-RPC dispatch ---

export async function handleMcpRequest(req: JsonRpcRequest): Promise<JsonRpcResponse> {
  const { id, method, params } = req;

  try {
    switch (method) {
      case "initialize":
        return {
          jsonrpc: "2.0",
          id,
          result: {
            protocolVersion: "2025-03-26",
            capabilities: {
              tools: { listChanged: false },
              resources: { subscribe: false, listChanged: false },
            },
            serverInfo: {
              name: "bot-arikigame",
              version: "0.1.0",
            },
          },
        };

      case "notifications/initialized":
        return { jsonrpc: "2.0", id, result: {} };

      case "tools/list":
        return { jsonrpc: "2.0", id, result: { tools: TOOLS } };

      case "tools/call": {
        const toolName = (params as { name: string }).name;
        const toolArgs = ((params as { arguments?: Record<string, unknown> }).arguments) || {};
        const result = await handleToolCall(toolName, toolArgs);
        return { jsonrpc: "2.0", id, result };
      }

      case "resources/list":
        return { jsonrpc: "2.0", id, result: { resources: RESOURCES } };

      case "resources/read": {
        const uri = (params as { uri: string }).uri;
        const result = await handleReadResource(uri);
        return { jsonrpc: "2.0", id, result };
      }

      case "ping":
        return { jsonrpc: "2.0", id, result: {} };

      default:
        return {
          jsonrpc: "2.0",
          id,
          error: { code: -32601, message: `Method not found: ${method}` },
        };
    }
  } catch (e) {
    const msg = e instanceof Error ? e.message : String(e);
    return {
      jsonrpc: "2.0",
      id,
      error: { code: -32000, message: msg },
    };
  }
}