/**
 * @param { import("knex").Knex } knex
 * @returns { Promise<void> }
 */
exports.up = async function (knex) {
  // Create calls table for tracking voice calls
  await knex.schema.createTable('calls', (table) => {
    table.string('id', 36).primary();
    table.string('call_sid', 100).unique().notNullable().comment('Twilio call SID');
    table.enum('direction', ['inbound', 'outbound']).notNullable();
    table.string('from_number', 20).notNullable();
    table.string('to_number', 20).notNullable();
    table.enum('status', [
      'queued',
      'ringing',
      'in-progress',
      'completed',
      'busy',
      'failed',
      'no-answer',
      'canceled'
    ]).notNullable().defaultTo('queued');
    table.integer('duration_seconds').unsigned().nullable();
    table.string('recording_url', 500).nullable();
    table.text('ai_transcript').nullable().comment('Full transcript from OpenAI');
    table.text('ai_summary').nullable().comment('AI-generated summary');
    table.json('ai_insights').nullable().comment('Structured insights from AI');
    table.string('user_id', 36).notNullable().comment('User who handled the call');
    table.timestamp('started_at').nullable();
    table.timestamp('ended_at').nullable();
    table.timestamp('created_at').defaultTo(knex.fn.now());
    table.timestamp('updated_at').defaultTo(knex.fn.now());

    // Indexes
    table.index('call_sid');
    table.index('user_id');
    table.index('status');
    table.index('direction');
    table.index(['created_at', 'user_id']);

    // Foreign key to users table
    table.foreign('user_id').references('id').inTable('users').onDelete('CASCADE');
  });

  console.log('✅ Created calls table');
};

/**
 * @param { import("knex").Knex } knex
 * @returns { Promise<void> }
 */
exports.down = async function (knex) {
  await knex.schema.dropTableIfExists('calls');
  console.log('✅ Dropped calls table');
};