-- /nexus_scholar_php/database/modul11_matchmaking.sql

-- 1. research_match_requests
CREATE TABLE research_match_requests (
    id INT AUTO_INCREMENT PRIMARY KEY,
    user_id INT NOT NULL,
    search_type VARCHAR(50) NOT NULL, -- e.g., 'Co-Author', 'Reviewer', 'Mentor', 'Research Partner'
    keywords TEXT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- 2. research_match_results
CREATE TABLE research_match_results (
    id INT AUTO_INCREMENT PRIMARY KEY,
    request_id INT NOT NULL,
    candidate_id INT NOT NULL,
    score INT NOT NULL DEFAULT 0,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (request_id) REFERENCES research_match_requests(id) ON DELETE CASCADE,
    FOREIGN KEY (candidate_id) REFERENCES users(id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- 3. collaboration_invitations
DROP TABLE IF EXISTS collaboration_invitations;
CREATE TABLE collaboration_invitations (
    id INT AUTO_INCREMENT PRIMARY KEY,
    sender_id INT NOT NULL,
    receiver_id INT NOT NULL,
    collaboration_type VARCHAR(100) NOT NULL, -- Co-Author, Reviewer, Mentor, Research Partner
    message TEXT NOT NULL,
    status ENUM('pending', 'accepted', 'declined', 'cancelled') DEFAULT 'pending',
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    FOREIGN KEY (sender_id) REFERENCES users(id) ON DELETE CASCADE,
    FOREIGN KEY (receiver_id) REFERENCES users(id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- 4. mentor_requests
CREATE TABLE mentor_requests (
    id INT AUTO_INCREMENT PRIMARY KEY,
    mentee_id INT NOT NULL,
    mentor_id INT NOT NULL,
    message TEXT NOT NULL,
    goals TEXT NULL,
    status ENUM('pending', 'accepted', 'declined', 'cancelled') DEFAULT 'pending',
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    FOREIGN KEY (mentee_id) REFERENCES users(id) ON DELETE CASCADE,
    FOREIGN KEY (mentor_id) REFERENCES users(id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;