const express = require("express");
const Workout = require("../systems/workout");

/**
 * @param {import("../repositories/sqlite3")} repo
 */
module.exports = function workoutRouter(repo) {  
  const router = express.Router({caseSensitive: false});

  /** @type {Workout[]} */
  let workouts = [];

  router.get("/", async(req, res) => {
    if (req.query.active === "true") {
      return res.status(200).json(workouts.map(w => ({
        id: w.id,
        bike: w.bike,
        program: w.program,
        date: w.date,
        active: true,
      })));
    }

    try {
      const dbWorkouts = await repo.listWorkouts();
      return res.status(200).json(dbWorkouts.map(w => ({
        ...w,
        active: workouts.find(w2 => w2.id === w.id) != null,
      })));
    } catch (err) {
      return res.status(400).json({code: 400, message: err.message || err})      
    }
  });

  router.get("/:id", async(req, res) => {
    let workout = workouts.find(w => w.id == req.params.id);
    if (workout != null) {
      return res.status(200).json({id: workout.id, bike: workout.bike, program: workout.program, date: workout.date, active: true})
    }

    try {
      workout = await repo.findWorkout(req.params.id);
      if (workout == null) {
        return res.status(404).json({code: 404, message: "workout not found"})
      }
  
      return res.status(200).json({active: false, ...workout});
    } catch (err) {
      return res.status(500).json({code: 500, message: err.message || err})      
    }
  });

  router.get("/:id/measurements/", async(req, res) => {
    try {
      const measurements = await repo.listMeasurements(req.params.id);
      if (measurements == null) {
        return res.status(404).json({code: 404, message: "measurements not found"})
      }
  
      return res.status(200).json(measurements);
    } catch (err) {
      return res.status(500).json({code: 500, message: err.message || err})      
    }
  });

  router.post("/", async(req, res) => {
    try {
      const {bikeId, programId} = req.body;

      const workout = await Workout.create(repo, bikeId, programId);
      workouts.push(workout);

      return res.status(200).json({id: workout.id, bike: workout.bike, program: workout.program, date: workout.date});
    } catch (err) {
      return res.status(400).json({code: 400, message: err.message || err});
    }
  });

  router.post("/:id/continue", async(req, res) => {
    let workout = workouts.find(w => w.id == req.params.id);
    if (workout != null) {
      return res.status(400).json({code: 400, message: "Workout already active."})
    }

    try {
      workout = await Workout.continue(repo, req.params.id);
      workouts.push(workout);

      return res.status(200).json({id: workout.id, bike: workout.bike, program: workout.program, date: workout.date});
    } catch (err) {
      return res.status(400).json({code: 400, message: err.message || err})      
    }
  });

  router.post("/:id/connect", async(req, res) => {
    const workout = workouts.find(w => w.id == req.params.id);
    if (workout == null) {
      return res.status(404).json({code: 404, message: "Workout not found or inactive."})
    }

    try {
      await workout.connect();
      return res.status(200).json({id: workout.id, bike: workout.bike, program: workout.program, date: workout.date});
    } catch(err) {
      return res.status(500).json({code: 500, message: err.message || err});
    }
  });

  router.post("/:id/start", async(req, res) => {
    const workout = workouts.find(w => w.id == req.params.id);
    if (workout == null) {
      return res.status(404).json({code: 404, message: "Workout not found or inactive."})
    }

    try {
      await workout.start();
      return res.status(200).json({id: workout.id, bike: workout.bike, program: workout.program, date: workout.date});
    } catch(err) {
      return res.status(500).json({code: 500, message: err.message || err});
    }
  });

  router.post("/:id/pause", async(req, res) => {
    const workout = workouts.find(w => w.id == req.params.id);
    if (workout == null) {
      return res.status(404).json({code: 404, message: "Workout not found or inactive."})
    }

    try {
      await workout.pause();
      return res.status(200).json({id: workout.id, bike: workout.bike, program: workout.program, date: workout.date});
    } catch(err) {
      return res.status(500).json({code: 500, message: err.message || err});
    }
  });

  router.post("/:id/stop", async(req, res) => {
    const workout = workouts.find(w => w.id == req.params.id);
    if (workout == null) {
      return res.status(404).json({code: 404, message: "Workout not found or inactive."})
    }

    try {
      if (workout.driver != null) {
        await workout.stop();
      }
    
      workouts = workouts.filter(w => w !== workout);
      await workout.destroy();
  
      return res.status(200).json({id: workout.id, bike: workout.bike, program: workout.program, date: workout.date});  
    } catch(err) {
      return res.status(500).json({code: 500, message: err.message || err});
    }
  });

  router.delete("/:id", async(req, res) => {
    let workout = workouts.find(w => w.id == req.params.id);
    if (workout != null) {
      return res.status(400).json({code: 400, message: "Workout already active."})
    }
    
    try {
      workout = await repo.findWorkout(req.params.id);
      if (workout == null) {
        return res.status(404).json({code: 404, message: "workout not found"})
      }
  
      await repo.deleteWorkout(workout);
  
      return res.status(200).json(workout);
    } catch (err) {
      return res.status(500).json({code: 500, message: err.message || err})      
    }
  });

  router.ws("/:id/subscribe", (ws, req) => {
    console.log("HELLO!")

    const workout = workouts.find(w => w.id === req.params.id);
    if (workout == null) {
      ws.send(JSON.stringify({error: "workout not found"}));
      ws.close();
    }

    workout.listMeasurements().then((list) => {
      ws.send(JSON.stringify({workoutStatusBackfill: list}));
    }).catch(err => {
      ws.send(JSON.stringify({error: `could not list measurements: ${err.message || err}`}));
      ws.close();
    });

    const handler = (workotuStatus) => {
      workotuStatus = {...workotuStatus};
      delete workotuStatus.id;
    
      ws.send(JSON.stringify({workotuStatus}))
    }
    
    workout.events.on("workoutStatus", handler);

    ws.onclose = () => {
      workout.events.removeListener("workoutStatus", handler);
      ws.removeAllListeners();
    };

    ws.send(JSON.stringify({
      workout: {
        id: workout.id,
        bike: workout.bike,
        program: workout.program,
        date: workout.date,
      },
    }));
  })

  return router;
}