#!/usr/bin/env node

const apiBase = (process.env.OPTICZ_API_BASE || 'http://127.0.0.1:3000').replace(/\/$/, '')
const apiKey = process.env.HERMES_API_KEY || 'hermes-demo-key-change-me'

const tools = [
  {
    name: 'opticz_status',
    description: 'Check OptiqueStock Hermes API health.',
    inputSchema: {
      type: 'object',
      properties: {},
    },
  },
  {
    name: 'opticz_summary',
    description: 'Get store counts, low stock products, pending workshop count, and recent sales.',
    inputSchema: {
      type: 'object',
      properties: {},
    },
  },
  {
    name: 'opticz_search_clients',
    description: 'Search OptiqueStock clients by name, phone, or email.',
    inputSchema: {
      type: 'object',
      properties: {
        q: { type: 'string', description: 'Search query.' },
        limit: { type: 'number', description: 'Maximum results, default 20, max 50.' },
      },
    },
  },
  {
    name: 'opticz_search_products',
    description: 'Search active products by reference, designation, brand, or category.',
    inputSchema: {
      type: 'object',
      properties: {
        q: { type: 'string', description: 'Search query.' },
        category: { type: 'string', description: 'Optional category filter, e.g. MONTURE or VERRE.' },
        inStockOnly: { type: 'boolean', description: 'Only include products with stock. Defaults true.' },
        limit: { type: 'number', description: 'Maximum results, default 25, max 75.' },
      },
    },
  },
  {
    name: 'opticz_create_client',
    description: 'Create a client, or return the existing client when the phone number already exists.',
    inputSchema: {
      type: 'object',
      required: ['nom', 'prenom', 'telephone'],
      properties: {
        nom: { type: 'string' },
        prenom: { type: 'string' },
        telephone: { type: 'string' },
        email: { type: 'string' },
        adresse: { type: 'string' },
        ville: { type: 'string' },
        codePostal: { type: 'string' },
        notes: { type: 'string' },
      },
    },
  },
  {
    name: 'opticz_create_repair_sale',
    description: 'Create a paid repair sale for an existing client.',
    inputSchema: {
      type: 'object',
      required: ['clientId', 'repairType', 'repairDescription', 'repairPrice'],
      properties: {
        clientId: { type: 'string' },
        repairType: { type: 'string' },
        repairDescription: { type: 'string' },
        repairPrice: { type: 'number' },
        additionalCharges: { type: 'number' },
        paymentMode: {
          type: 'string',
          enum: ['ESPECES', 'CARTE', 'CHEQUE', 'VIREMENT', 'BON_CAISSE'],
        },
      },
    },
  },
]

async function api(path, options = {}) {
  const response = await fetch(`${apiBase}${path}`, {
    ...options,
    headers: {
      Authorization: `Bearer ${apiKey}`,
      'Content-Type': 'application/json',
      ...(options.headers || {}),
    },
  })
  const text = await response.text()
  const data = text ? JSON.parse(text) : null

  if (!response.ok) {
    throw new Error(data?.error || `HTTP ${response.status}`)
  }

  return data
}

function query(params) {
  const search = new URLSearchParams()
  for (const [key, value] of Object.entries(params || {})) {
    if (value !== undefined && value !== null && value !== '') {
      search.set(key, String(value))
    }
  }
  const value = search.toString()
  return value ? `?${value}` : ''
}

async function callTool(name, args) {
  switch (name) {
    case 'opticz_status':
      return api('/api/hermes/status')
    case 'opticz_summary':
      return api('/api/hermes/summary')
    case 'opticz_search_clients':
      return api(`/api/hermes/clients${query(args)}`)
    case 'opticz_search_products':
      return api(`/api/hermes/products${query(args)}`)
    case 'opticz_create_client':
      return api('/api/hermes/clients', {
        method: 'POST',
        body: JSON.stringify(args || {}),
      })
    case 'opticz_create_repair_sale':
      return api('/api/hermes/sales/repair', {
        method: 'POST',
        body: JSON.stringify(args || {}),
      })
    default:
      throw new Error(`Unknown tool: ${name}`)
  }
}

function send(message) {
  process.stdout.write(`${JSON.stringify(message)}\n`)
}

async function handle(message) {
  const { id, method, params } = message

  if (method === 'initialize') {
    send({
      jsonrpc: '2.0',
      id,
      result: {
        protocolVersion: params?.protocolVersion || '2024-11-05',
        capabilities: {
          tools: {},
        },
        serverInfo: {
          name: 'opticz-hermes-mcp',
          version: '0.1.0',
        },
      },
    })
    return
  }

  if (method === 'notifications/initialized') return

  if (method === 'tools/list') {
    send({
      jsonrpc: '2.0',
      id,
      result: { tools },
    })
    return
  }

  if (method === 'tools/call') {
    try {
      const result = await callTool(params?.name, params?.arguments || {})
      send({
        jsonrpc: '2.0',
        id,
        result: {
          content: [
            {
              type: 'text',
              text: JSON.stringify(result, null, 2),
            },
          ],
        },
      })
    } catch (error) {
      send({
        jsonrpc: '2.0',
        id,
        result: {
          isError: true,
          content: [
            {
              type: 'text',
              text: error instanceof Error ? error.message : 'Unknown error',
            },
          ],
        },
      })
    }
    return
  }

  send({
    jsonrpc: '2.0',
    id,
    error: {
      code: -32601,
      message: `Unsupported method: ${method}`,
    },
  })
}

let buffer = ''
process.stdin.setEncoding('utf8')
process.stdin.on('data', (chunk) => {
  buffer += chunk
  const lines = buffer.split(/\r?\n/)
  buffer = lines.pop() || ''

  for (const line of lines) {
    if (!line.trim()) continue
    try {
      handle(JSON.parse(line))
    } catch (error) {
      send({
        jsonrpc: '2.0',
        id: null,
        error: {
          code: -32700,
          message: error instanceof Error ? error.message : 'Parse error',
        },
      })
    }
  }
})