DROP TABLE IF EXISTS "Person" CASCADE;


CREATE TABLE "Person" (
  id int PRIMARY KEY,
  full_name text NOT NULL,
  passwd_hash char(64) NOT NULL
);


CREATE TABLE "Client" (
  phone text NOT NULL,
  email text NOT NULL,
  billing_account text NOT NULL,
  
  PRIMARY KEY(id)
) INHERITS ("Person");


CREATE TABLE "Master" (
  passport text UNIQUE NOT NULL,
  readme text NOT NULL,

  PRIMARY KEY(id)
) INHERITS ("Person");


DROP TABLE IF EXISTS "Studio", "Course", "Class", "Class_Master", "Registration", "FoodProductEnum", "FoodProduct", "Equipment", "Class_Equipment", "DrugEnum", "Drug", "DrugIntolerance", "ActivityLog";


CREATE TABLE "Studio" (
  id int PRIMARY KEY,
  address text UNIQUE NOT NULL,
  capacity int NOT NULL CHECK (capacity > 0),
  begin_date timestamptz NOT NULL,
  duration interval NOT NULL
);


CREATE TABLE "Course" (
  id int PRIMARY KEY,
  Master_id int,
  name text NOT NULL,
  duration interval NOT NULL,

  FOREIGN KEY (Master_id) REFERENCES "Master" (id)
    ON DELETE SET NULL
    ON UPDATE CASCADE
);


CREATE TABLE "Class" (
  begin_date timestamptz,
  Course_id int,
  Studio_id int,
  name text NOT NULL,
  type int NOT NULL,
  duration interval NOT NULL,

  PRIMARY KEY (begin_date, Course_id),

  FOREIGN KEY (Course_id) REFERENCES "Course" (id)
    ON DELETE CASCADE
    ON UPDATE CASCADE,
  
  FOREIGN KEY (Studio_id) REFERENCES "Studio" (id)
    ON DELETE SET NULL
    ON UPDATE CASCADE
);


CREATE TABLE "Class_Master" (
  Class_begin_date timestamptz,
  Class_Course_id int,
  Master_id int,

  PRIMARY KEY (Class_begin_date, Class_Course_id, Master_id),

  FOREIGN KEY (Master_id) REFERENCES "Master" (id)
    ON DELETE CASCADE
    ON UPDATE CASCADE,
  
  FOREIGN KEY (Class_begin_date, Class_Course_id) REFERENCES "Class" (begin_date, Course_id)
    ON DELETE CASCADE
    ON UPDATE CASCADE
);


CREATE TABLE "Registration" (
  Client_id int,
  Course_id int,
  date timestamptz NOT NULL,
  status int NOT NULL,

  PRIMARY KEY (Client_id, Course_id),

  FOREIGN KEY (Client_id) REFERENCES "Client" (id)
    ON DELETE CASCADE
    ON UPDATE CASCADE,
  
  FOREIGN KEY (Course_id) REFERENCES "Course" (id)
    ON DELETE CASCADE
    ON UPDATE CASCADE
);


CREATE TABLE "FoodProductEnum" (
  id int PRIMARY KEY,
  name text NOT NULL,
  avg_price real NOT NULL
);


CREATE TABLE "FoodProduct" (
  id int,
  FoodProductEnum_id int,
  Class_begin_date timestamptz,
  Class_Course_id int,
  buy_price real NOT NULL,
  buy_date timestamptz NOT NULL,
  delivery_price real NOT NULL,
  delivery_date timestamptz NOT NULL,
  expires_date timestamptz NOT NULL,

  PRIMARY KEY (id, FoodProductEnum_id),

  FOREIGN KEY (FoodProductEnum_id) REFERENCES "FoodProductEnum" (id)
    ON DELETE RESTRICT
    ON UPDATE RESTRICT,
  
  FOREIGN KEY (Class_begin_date, Class_Course_id) REFERENCES "Class" (begin_date, Course_id)
    ON DELETE SET NULL
    ON UPDATE CASCADE
);


CREATE TABLE "Equipment" (
  id int PRIMARY KEY,
  Studio_id int,
  name text NOT NULL,
  usage_price real NOT NULL,
  usage_type int NOT NULL,
  delivery_price real NOT NULL,
  delivery_date timestamptz NOT NULL,

  FOREIGN KEY (Studio_id) REFERENCES "Studio" (id)
    ON DELETE SET NULL
    ON UPDATE CASCADE
);


CREATE TABLE "Class_Equipment" (
  Class_begin_date timestamptz,
  Class_Course_id int,
  Equipment_id int,

  PRIMARY KEY (Class_begin_date, Class_Course_id, Equipment_id),

  FOREIGN KEY (Class_begin_date, Class_course_id) REFERENCES "Class" (begin_date, Course_id)
    ON DELETE CASCADE
    ON UPDATE CASCADE,
  
  FOREIGN KEY (Equipment_id) REFERENCES "Equipment" (id)
    ON DELETE RESTRICT
    ON UPDATE CASCADE
);


CREATE TABLE "DrugEnum" (
  id int PRIMARY KEY,
  name text NOT NULL,
  avg_price real NOT NULL
);


CREATE TABLE "Drug" (
  id int,
  DrugEnum_id int,
  Course_id int,
  buy_price real NOT NULL,
  buy_date timestamptz NOT NULL,
  delivery_price real NOT NULL,
  delivery_date timestamptz NOT NULL,
  expires_date timestamptz NOT NULL,

  PRIMARY KEY (id, DrugEnum_id),

  FOREIGN KEY (DrugEnum_id) REFERENCES "DrugEnum" (id)
    ON DELETE RESTRICT
    ON UPDATE RESTRICT,
  
  FOREIGN KEY (Course_id) REFERENCES "Course" (id)
    ON DELETE SET NULL
    ON UPDATE CASCADE
);


CREATE TABLE "DrugIntolerance" (
  Person_id int,
  DrugEnum_id int,

  PRIMARY KEY (Person_id, DrugEnum_id),

  FOREIGN KEY (Person_id) REFERENCES "Person" (id)
    ON DELETE CASCADE
    ON UPDATE CASCADE,
  
  FOREIGN KEY (DrugEnum_id) REFERENCES "DrugEnum" (id)
    ON DELETE CASCADE
    ON UPDATE CASCADE
);


CREATE TABLE "ActivityLog" (
  id int,
  Person_id int,
  action text NOT NULL,

  PRIMARY KEY (id, Person_id),

  FOREIGN KEY (Person_id) REFERENCES "Person" (id)
    ON DELETE NO ACTION
    ON UPDATE CASCADE
);