#!/usr/bin/env node
/**
 * Task MCP Server
 *
 * Exposes task management tools via Model Context Protocol.
 * Uses PostgreSQL with pgvector for semantic search.
 *
 * Requires SSH tunnel to infra VM on port 5433:
 *   ssh -L 5433:localhost:5432 -i ~/.ssh/hetzner_mash_deploy root@46.224.188.157 -N &
 */

import { Server } from '@modelcontextprotocol/sdk/server/index.js';
import { StdioServerTransport } from '@modelcontextprotocol/sdk/server/stdio.js';
import {
  CallToolRequestSchema,
  ListToolsRequestSchema,
} from '@modelcontextprotocol/sdk/types.js';

import { testConnection, close } from './db.js';
import { toolDefinitions } from './tools/index.js';
import { taskAdd, taskList, taskShow, taskClose, taskUpdate } from './tools/crud.js';
import { taskSimilar, taskContext } from './tools/search.js';
import { taskLink, checklistAdd, checklistToggle, taskResolveDuplicate } from './tools/relations.js';
import { epicAdd, epicList, epicShow, epicAssign, epicClose } from './tools/epics.js';
import { taskDelegations, taskDelegationQuery } from './tools/delegations.js';
import { projectLock, projectUnlock, projectLockStatus, projectContext } from './tools/locks.js';
import { versionAdd, versionList, versionShow, versionUpdate, versionRelease, versionAssignTask } from './tools/versions.js';
import { taskCommitAdd, taskCommitRemove, taskCommitsList, taskLinkCommits, sessionTasks } from './tools/commits.js';
import { changelogAdd, changelogSinceSession, changelogList } from './tools/changelog.js';
import {
  componentRegister,
  componentList,
  componentAddDependency,
  componentAddFile,
  componentAddCheck,
  impactAnalysis,
  impactLearn,
  componentGraph,
} from './tools/impact.js';
import { memoryAdd, memorySearch, memoryList, memoryContext } from './tools/memories.js';
import { toolDocAdd, toolDocSearch, toolDocGet, toolDocList, toolDocExport } from './tools/tool-docs.js';
import {
  sessionStart,
  sessionUpdate,
  sessionEnd,
  sessionList,
  sessionSearch,
  sessionContext,
  buildRecord,
  sessionCommitLink,
} from './tools/sessions.js';
import {
  sessionNoteAdd,
  sessionNotesList,
  sessionPlanSave,
  sessionPlanUpdateStatus,
  sessionPlanList,
  projectDocUpsert,
  projectDocGet,
  projectDocList,
  sessionDocumentationGenerate,
  sessionSemanticSearch,
  sessionProductivityAnalytics,
  sessionPatternDetection,
} from './tools/session-docs.js';
import { archiveAdd, archiveSearch, archiveList, archiveGet } from './tools/archives.js';

// Create MCP server
const server = new Server(
  { name: 'task-mcp', version: '1.0.0' },
  { capabilities: { tools: {} } }
);

// Register tool list handler
server.setRequestHandler(ListToolsRequestSchema, async () => ({
  tools: toolDefinitions,
}));

// Register tool call handler
server.setRequestHandler(CallToolRequestSchema, async (request) => {
  const { name, arguments: args } = request.params;

  try {
    let result: string;
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    const a = args as any;

    switch (name) {
      // CRUD
      case 'task_add':
        result = await taskAdd({
          title: a.title,
          project: a.project,
          type: a.type,
          priority: a.priority,
          description: a.description,
        });
        break;
      case 'task_list':
        result = await taskList({
          project: a.project,
          status: a.status,
          type: a.type,
          priority: a.priority,
          limit: a.limit,
        });
        break;
      case 'task_show':
        result = await taskShow(a.id);
        break;
      case 'task_close':
        result = await taskClose(a.id);
        break;
      case 'task_update':
        result = await taskUpdate({
          id: a.id,
          status: a.status,
          priority: a.priority,
          type: a.type,
          title: a.title,
        });
        break;

      // Search
      case 'task_similar':
        result = await taskSimilar({
          query: a.query,
          project: a.project,
          limit: a.limit,
        });
        break;
      case 'task_context':
        result = await taskContext({
          description: a.description,
          project: a.project,
          limit: a.limit,
        });
        break;

      // Relations
      case 'task_link':
        result = await taskLink({
          from_id: a.from_id,
          to_id: a.to_id,
          link_type: a.link_type,
        });
        break;
      case 'task_checklist_add':
        result = await checklistAdd({
          task_id: a.task_id,
          item: a.item,
        });
        break;
      case 'task_checklist_toggle':
        result = await checklistToggle({
          item_id: a.item_id,
          checked: a.checked,
        });
        break;
      case 'task_resolve_duplicate':
        result = await taskResolveDuplicate({
          duplicate_id: a.duplicate_id,
          dominant_id: a.dominant_id,
        });
        break;

      // Epics
      case 'epic_add':
        result = await epicAdd({
          title: a.title,
          project: a.project,
          description: a.description,
        });
        break;
      case 'epic_list':
        result = await epicList({
          project: a.project,
          status: a.status,
          limit: a.limit,
        });
        break;
      case 'epic_show':
        result = await epicShow(a.id);
        break;
      case 'epic_assign':
        result = await epicAssign({
          task_id: a.task_id,
          epic_id: a.epic_id,
        });
        break;
      case 'epic_close':
        result = await epicClose(a.id);
        break;

      // Delegations
      case 'task_delegations':
        result = await taskDelegations({ task_id: a.task_id });
        break;
      case 'task_delegation_query':
        result = await taskDelegationQuery({
          status: a.status,
          backend: a.backend,
          limit: a.limit,
        });
        break;

      // Project Locks
      case 'project_lock':
        result = await projectLock({
          project: a.project,
          session_id: a.session_id,
          duration_minutes: a.duration_minutes,
          reason: a.reason,
        });
        break;
      case 'project_unlock':
        result = await projectUnlock({
          project: a.project,
          session_id: a.session_id,
          force: a.force,
        });
        break;
      case 'project_lock_status':
        result = await projectLockStatus({
          project: a.project,
        });
        break;
      case 'project_context':
        result = await projectContext();
        break;

      // Versions
      case 'version_add':
        result = await versionAdd({
          project: a.project,
          version: a.version,
          build_number: a.build_number,
          status: a.status,
          release_notes: a.release_notes,
        });
        break;
      case 'version_list':
        result = await versionList({
          project: a.project,
          status: a.status,
          limit: a.limit,
        });
        break;
      case 'version_show':
        result = await versionShow(a.id);
        break;
      case 'version_update':
        result = await versionUpdate({
          id: a.id,
          status: a.status,
          git_tag: a.git_tag,
          git_sha: a.git_sha,
          release_notes: a.release_notes,
          release_date: a.release_date,
        });
        break;
      case 'version_release':
        result = await versionRelease({
          id: a.id,
          git_tag: a.git_tag,
        });
        break;
      case 'version_assign_task':
        result = await versionAssignTask({
          task_id: a.task_id,
          version_id: a.version_id,
        });
        break;

      // Commits
      case 'task_commit_add':
        result = await taskCommitAdd({
          task_id: a.task_id,
          commit_sha: a.commit_sha,
          repo: a.repo,
          source: a.source,
        });
        break;
      case 'task_commit_remove':
        result = await taskCommitRemove({
          task_id: a.task_id,
          commit_sha: a.commit_sha,
        });
        break;
      case 'task_commits_list':
        result = await taskCommitsList(a.task_id);
        break;
      case 'task_link_commits':
        result = await taskLinkCommits({
          repo: a.repo,
          commits: a.commits,
          dry_run: a.dry_run,
        });
        break;
      case 'session_tasks':
        result = await sessionTasks({
          session_id: a.session_id,
          limit: a.limit,
        });
        break;

      // Infrastructure Changelog
      case 'changelog_add':
        result = await changelogAdd(a as any);
        break;
      case 'changelog_since_session':
        result = await changelogSinceSession(a as any);
        break;
      case 'changelog_list':
        result = await changelogList(a.days_back, a.limit);
        break;

      // Impact Analysis
      case 'component_register':
        result = JSON.stringify(await componentRegister(a.id, a.name, a.type, {
          path: a.path,
          repo: a.repo,
          description: a.description,
          health_check: a.health_check,
        }), null, 2);
        break;
      case 'component_list':
        result = JSON.stringify(await componentList(a.type), null, 2);
        break;
      case 'component_add_dependency':
        result = JSON.stringify(await componentAddDependency(
          a.component_id,
          a.depends_on,
          a.dependency_type,
          a.description
        ), null, 2);
        break;
      case 'component_add_file':
        result = JSON.stringify(await componentAddFile(a.component_id, a.file_pattern), null, 2);
        break;
      case 'component_add_check':
        result = JSON.stringify(await componentAddCheck(a.component_id, a.name, a.check_type, a.check_command, {
          expected_result: a.expected_result,
          timeout_seconds: a.timeout_seconds,
        }), null, 2);
        break;
      case 'impact_analysis':
        result = JSON.stringify(await impactAnalysis(a.changed_files), null, 2);
        break;
      case 'impact_learn':
        result = JSON.stringify(await impactLearn(
          a.changed_component,
          a.affected_component,
          a.impact_description,
          { error_id: a.error_id, task_id: a.task_id }
        ), null, 2);
        break;
      case 'component_graph':
        result = JSON.stringify(await componentGraph(a.component_id), null, 2);
        break;

      // Memories
      case 'memory_add':
        result = await memoryAdd({
          category: a.category,
          title: a.title,
          content: a.content,
          context: a.context,
          project: a.project,
          session_id: a.session_id,
          task_id: a.task_id,
        });
        break;
      case 'memory_search':
        result = await memorySearch({
          query: a.query,
          project: a.project,
          category: a.category,
          limit: a.limit,
        });
        break;
      case 'memory_list':
        result = await memoryList({
          project: a.project,
          category: a.category,
          limit: a.limit,
        });
        break;
      case 'memory_context':
        result = await memoryContext(a.project, a.task_description);
        break;

      // Tool Documentation
      case 'tool_doc_add':
        result = await toolDocAdd({
          tool_name: a.tool_name,
          category: a.category,
          title: a.title,
          description: a.description,
          usage_example: a.usage_example,
          parameters: a.parameters,
          notes: a.notes,
          tags: a.tags,
          source_file: a.source_file,
        });
        break;
      case 'tool_doc_search':
        result = await toolDocSearch({
          query: a.query,
          category: a.category,
          tags: a.tags,
          limit: a.limit,
        });
        break;
      case 'tool_doc_get':
        result = await toolDocGet({
          tool_name: a.tool_name,
        });
        break;
      case 'tool_doc_list':
        result = await toolDocList({
          category: a.category,
          tag: a.tag,
          limit: a.limit,
        });
        break;
      case 'tool_doc_export':
        result = await toolDocExport();
        break;

      // Sessions
      case 'session_start':
        result = await sessionStart({
          session_id: a.session_id,
          project: a.project,
          working_directory: a.working_directory,
          git_branch: a.git_branch,
          initial_prompt: a.initial_prompt,
        });
        break;
      case 'session_update':
        result = await sessionUpdate({
          session_id: a.session_id,
          message_count: a.message_count,
          token_count: a.token_count,
          tools_used: a.tools_used,
        });
        break;
      case 'session_end':
        result = await sessionEnd({
          session_id: a.session_id,
          summary: a.summary,
          status: a.status,
        });
        break;
      case 'session_list':
        result = await sessionList({
          project: a.project,
          status: a.status,
          since: a.since,
          limit: a.limit,
        });
        break;
      case 'session_search':
        result = await sessionSearch({
          query: a.query,
          project: a.project,
          limit: a.limit,
        });
        break;
      case 'session_context':
        result = await sessionContext(a.session_id);
        break;
      case 'build_record':
        result = await buildRecord(
          a.session_id,
          a.version_id,
          a.build_number,
          a.git_commit_sha,
          a.status,
          a.started_at
        );
        break;
      case 'session_commit_link':
        result = await sessionCommitLink(
          a.session_id,
          a.commit_sha,
          a.repo,
          a.commit_message,
          a.committed_at
        );
        break;

      // Session Documentation
      case 'session_note_add':
        result = await sessionNoteAdd({
          session_id: a.session_id,
          note_type: a.note_type,
          content: a.content,
        });
        break;
      case 'session_notes_list':
        result = JSON.stringify(
          await sessionNotesList({
            session_id: a.session_id,
            note_type: a.note_type,
          }),
          null,
          2
        );
        break;
      case 'session_plan_save':
        result = await sessionPlanSave({
          session_id: a.session_id,
          plan_content: a.plan_content,
          plan_file_name: a.plan_file_name,
          status: a.status,
        });
        break;
      case 'session_plan_update_status':
        result = await sessionPlanUpdateStatus({
          plan_id: a.plan_id,
          status: a.status,
        });
        break;
      case 'session_plan_list':
        result = JSON.stringify(
          await sessionPlanList({
            session_id: a.session_id,
            status: a.status,
          }),
          null,
          2
        );
        break;
      case 'project_doc_upsert':
        result = await projectDocUpsert({
          project: a.project,
          doc_type: a.doc_type,
          title: a.title,
          content: a.content,
          session_id: a.session_id,
        });
        break;
      case 'project_doc_get':
        result = JSON.stringify(
          await projectDocGet({
            project: a.project,
            doc_type: a.doc_type,
          }),
          null,
          2
        );
        break;
      case 'project_doc_list':
        result = JSON.stringify(
          await projectDocList({
            project: a.project,
          }),
          null,
          2
        );
        break;
      case 'session_documentation_generate':
        result = await sessionDocumentationGenerate({
          session_id: a.session_id,
        });
        break;
      case 'session_semantic_search':
        result = JSON.stringify(
          await sessionSemanticSearch({
            query: a.query,
            project: a.project,
            limit: a.limit,
          }),
          null,
          2
        );
        break;
      case 'session_productivity_analytics':
        result = JSON.stringify(
          await sessionProductivityAnalytics({
            project: a.project,
            time_period: a.time_period,
          }),
          null,
          2
        );
        break;
      case 'session_pattern_detection':
        result = JSON.stringify(
          await sessionPatternDetection({
            project: a.project,
            pattern_type: a.pattern_type,
          }),
          null,
          2
        );
        break;

      // Archives
      case 'archive_add':
        result = await archiveAdd({
          project: a.project,
          archive_type: a.archive_type,
          title: a.title,
          content: a.content,
          original_path: a.original_path,
          file_size: a.file_size,
          archived_by_session: a.archived_by_session,
          metadata: a.metadata,
        });
        break;
      case 'archive_search':
        result = await archiveSearch({
          query: a.query,
          project: a.project,
          archive_type: a.archive_type,
          limit: a.limit,
        });
        break;
      case 'archive_list':
        result = await archiveList({
          project: a.project,
          archive_type: a.archive_type,
          since: a.since,
          limit: a.limit,
        });
        break;
      case 'archive_get':
        result = await archiveGet({
          id: a.id,
        });
        break;

      default:
        throw new Error(`Unknown tool: ${name}`);
    }

    return {
      content: [{ type: 'text', text: result }],
    };
  } catch (error) {
    const message = error instanceof Error ? error.message : String(error);
    return {
      content: [{ type: 'text', text: `Error: ${message}` }],
      isError: true,
    };
  }
});

// Main entry point
async function main() {
  // Set up cleanup
  process.on('SIGINT', async () => {
    await close();
    process.exit(0);
  });

  process.on('SIGTERM', async () => {
    await close();
    process.exit(0);
  });

  // Start server FIRST - respond to MCP protocol immediately
  // This is critical: Claude Code sends initialize before we finish DB connection
  const transport = new StdioServerTransport();
  await server.connect(transport);
  console.error('task-mcp: Server started');

  // Test database connection in background (lazy - will connect on first tool call anyway)
  testConnection().then((connected) => {
    if (connected) {
      console.error('task-mcp: Connected to database');
    } else {
      console.error('task-mcp: Warning - database not reachable, will retry on tool calls');
    }
  });
}

main().catch((error) => {
  console.error('task-mcp: Fatal error:', error);
  process.exit(1);
});