const sqlite3 = require("sqlite3").verbose();

class SQLite3Repository {
  constructor(path) {
    this.db = new sqlite3.Database(path);
  }

  /**
   * @returns {Promise<void>}
   */
  setup() {
    return new Promise((resolve, reject) => {
      this.db.run(SQL_TABLE_BIKE, (err) => {
        if (err != null) {
          reject(err);
        }

        this.db.run(SQL_TABLE_PROGRAM, (err) => {
          if (err != null) {
            reject(err);
          }

          this.db.run(SQL_TABLE_WORKOUT, (err) => {
            if (err != null) {
              reject(err);
            }

            this.db.run(SQL_TABLE_MEASUREMENT, (err) => {
              if (err != null) {
                reject(err);
              }

              resolve();
            });
          });
        });
      });
    });
  }

  insert(obj, table, params) {
    return new Promise((resolve, reject) => {
      const query = `INSERT INTO ${table} (${params.join(", ")}) VALUES (${params.map(p => ':'+p).join(", ")});`;
      const values = params.map(p => obj[p]);
      this.db.run(query, values, function(err) {
        if (err != null) {
          return reject(err);
        }

        resolve(this.lastID);
      });
    });
  }

  update(obj, table, key, keys) {
    return new Promise((resolve, reject) => {
      const query = `UPDATE ${table} SET ${keys.map(k => `${k}=:${k}`).join(" AND ")} WHERE ${key}=:${key}`;
      const values = [
        ...keys.map(k => obj[k]),
        obj[key],
      ];
      
      this.db.run(query, values, function(err) {
        if (err != null) {
          return reject(err);
        }

        resolve();
      });
    });
  }

  delete(obj, table, key) {
    return new Promise((resolve, reject) => {
      const query = `DELETE FROM ${table} WHERE ${key}=:${key};`
      this.db.run(query, [obj[key]], function(err) {
        if (err != null) {
          return reject(err);
        }

        resolve(this.changes);
      });
    });
  }

  findOne(table, match) {
    return this.find(table, match).then(res => res[0] || null)
  }

  find(table, match) {
    return new Promise((resolve, reject) => {
      const keys = Object.keys(match).filter(k => match[k] != null);
      const params = keys.map(k => match[k]);
      const query = `SELECT * FROM ${table}${keys.length > 0 ? ` WHERE ${keys.map(k => `${k}=:${k}`).join(" AND ")}` : ""};`;
      this.db.all(query, params, function(err, rows) {
        if (err != null) {
          return reject(err);
        }

        resolve(rows);
      });
    });
  }

  findBike(id) {
    return this.findOne("bike", {id});
  }

  listBikes() {
    return this.find("bike", {});
  }

  insertBike(bike) {
    return this.insert(bike, "bike", ["name", "driver", "connect", "maxLevel"]);
  }

  updateBike(bike) {
    return this.update(bike, "bike", "id", ["name"]);
  }

  deleteBike(bike) {
    return this.delete(bike, "bike", "id");
  }

  findProgram(id) {
    return this.findOne("program", {id});
  }

  listPrograms() {
    return this.find("program", {});
  }

  insertProgram(program) {
    return this.insert(program, "program", ["name", "cpm", "warmupMin", "warmupCpm"]);
  }

  updateProgram(program) {
    return this.update(program, "program", "id", ["name"]);
  }

  deleteProgram(program) {
    return this.delete(program, "program", "id");
  }

  findWorkout(id) {
    return this.findOne("workout", {id}).then(d => ({...d, date: new Date(d.date)}));
  }

  listWorkouts({programId, bikeId} = {}) {
    return this.find("workout", {programId, bikeId}).then(l => l.map(d => ({...d, date: new Date(d.date)})));
  }

  insertWorkout(workout) {
    return this.insert(workout, "workout", ["bikeId","programId","date"]);
  }

  deleteWorkout(workout) {
    return this.delete(workout, "workout", "id");
  }

  findMeasurement(id) {
    return this.findOne("measurement", {id});
  }

  listMeasurements(workoutId) {
    return this.find("measurement", {workoutId});
  }

  insertMeasurement(measurement) {
    return this.insert(measurement, "measurement", ["workoutId","minutes","seconds","speed","rpm","distance","calories","pulse","watt","level"]);
  }

  deleteMeasurement(measurement) {
    return this.delete(measurement, "measurement", "id");
  }

  deleteMeasurements({workoutId}) {
    return this.delete({workoutId}, "measurement", "workoutId");
  }
}

const SQL_TABLE_BIKE = `
  CREATE TABLE IF NOT EXISTS bike (
    id INTEGER PRIMARY KEY,
    name VARCHAR(255) NOT NULL,
    driver VARCHAR(255) NOT NULL,
    connect VARCHAR(255) NOT NULL,
    maxLevel INT
  );
`;

const SQL_TABLE_PROGRAM = `
  CREATE TABLE IF NOT EXISTS program (
    id INTEGER PRIMARY KEY,
    name VARCHAR(255) NOT NULL,
    cpm INT NOT NULL,
    warmupMin INT NOT NULL,
    warmupCpm INT NOT NULL
  );
`;

const SQL_TABLE_WORKOUT = `
  CREATE TABLE IF NOT EXISTS workout (
    id INTEGER PRIMARY KEY,
    bikeId INT NOT NULL,
    programId INT NOT NULL,
    date DATETIME NOT NULL
  );
`;

const SQL_TABLE_MEASUREMENT = `
  CREATE TABLE IF NOT EXISTS measurement (
    id INTEGER PRIMARY KEY,
    workoutId INT NOT NULL,
    minutes INT,
    seconds INT,
    speed REAL,
    rpm REAL,
    distance REAL,
    calories REAL,
    pulse INT,
    watt REAL,
    level INT
  );
`;

module.exports = SQLite3Repository;