-- /nexus_scholar_php/database/modul3_submission.sql

-- 1. Table submissions
CREATE TABLE submissions (
    id INT AUTO_INCREMENT PRIMARY KEY,
    journal_id INT NOT NULL,
    user_id INT NOT NULL, -- submitting author
    title VARCHAR(255) NOT NULL,
    abstract TEXT,
    status VARCHAR(50) DEFAULT 'draft',
    submitted_at TIMESTAMP NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    FOREIGN KEY (journal_id) REFERENCES journals(id) ON DELETE CASCADE,
    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- 2. Table submission_files
CREATE TABLE submission_files (
    id INT AUTO_INCREMENT PRIMARY KEY,
    submission_id INT NOT NULL,
    file_type VARCHAR(50) NOT NULL, -- 'main_article', 'supplementary'
    original_name VARCHAR(255) NOT NULL,
    file_path VARCHAR(255) NOT NULL,
    mime_type VARCHAR(100),
    file_size INT,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (submission_id) REFERENCES submissions(id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- 3. Table submission_authors
CREATE TABLE submission_authors (
    id INT AUTO_INCREMENT PRIMARY KEY,
    submission_id INT NOT NULL,
    first_name VARCHAR(100) NOT NULL,
    last_name VARCHAR(100) NOT NULL,
    email VARCHAR(255) NOT NULL,
    affiliation VARCHAR(255),
    is_corresponding BOOLEAN DEFAULT FALSE,
    display_order INT DEFAULT 0,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    FOREIGN KEY (submission_id) REFERENCES submissions(id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- 4. Table submission_keywords
CREATE TABLE submission_keywords (
    id INT AUTO_INCREMENT PRIMARY KEY,
    submission_id INT NOT NULL,
    keyword VARCHAR(100) NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (submission_id) REFERENCES submissions(id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- 5. Table submission_status_logs
CREATE TABLE submission_status_logs (
    id INT AUTO_INCREMENT PRIMARY KEY,
    submission_id INT NOT NULL,
    user_id INT NULL, -- Context of who changed it, optional
    old_status VARCHAR(50),
    new_status VARCHAR(50) NOT NULL,
    notes TEXT,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (submission_id) REFERENCES submissions(id) ON DELETE CASCADE,
    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE SET NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;