-- B03 청크 업로드 관련 테이블 생성

CREATE TABLE IF NOT EXISTS upload_sessions (
  id VARCHAR(36) NOT NULL PRIMARY KEY,
  project_id VARCHAR(36) NOT NULL,
  original_filename VARCHAR(255) NOT NULL,
  file_size_bytes BIGINT NOT NULL,
  chunk_size_bytes BIGINT NOT NULL,
  total_chunks INT NOT NULL,
  completed_chunks INT DEFAULT 0,
  status ENUM('PENDING', 'IN_PROGRESS', 'COMPLETED', 'FAILED') DEFAULT 'PENDING',
  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
  updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  FOREIGN KEY (project_id) REFERENCES projects(id) ON DELETE CASCADE,
  INDEX idx_project_id (project_id),
  INDEX idx_status (status),
  INDEX idx_created_at (created_at)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS upload_chunks (
  id INT AUTO_INCREMENT PRIMARY KEY,
  session_id VARCHAR(36) NOT NULL,
  chunk_index INT NOT NULL,
  chunk_hash VARCHAR(64),
  size_bytes BIGINT NOT NULL,
  stored_at VARCHAR(255),
  completed_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
  UNIQUE KEY uq_session_chunk (session_id, chunk_index),
  FOREIGN KEY (session_id) REFERENCES upload_sessions(id) ON DELETE CASCADE,
  INDEX idx_session_id (session_id),
  INDEX idx_completed_at (completed_at)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;