"""File parsing module"""
import os

from rq import get_current_job
from flask import (
    request,
    url_for,
    redirect,
    Blueprint,
    render_template,
    current_app as app)

from . import jobs
from quality_control.errors import ParseError
from quality_control.parsing import (
    FileType,
    parse_file,
    strain_names,
    parse_strains)

parsebp = Blueprint("parse", __name__)

def queued_parse(filepath, filetype):
    job = get_current_job()
    job.meta["filename"] = os.path.basename(filepath)
    job.meta["status"] = "in-progress"
    job.save_meta()
    filesize = os.stat(filepath).st_size
    try:
        parsed = parse_file(
            filepath, filetype, strain_names(parse_strains("strains.csv")))
        for line, curr_size in parsed:
            job.meta["progress"] = (curr_size/filesize) * 100
            job.meta["status"] = f"Parsed {curr_size} bytes"
            job.save_meta()

        os.remove(filepath)
        job.meta["progress"] = 100
        job.meta["status"] = "success"
        job.meta["results"] = {"message": "no errors found"}
        job.save_meta()
    except ParseError as pe:
        pe_dict = pe.args[0]
        job.meta["status"] = "parse-error"
        job.meta["results"] = {
            "filename": filename, "filetype": filetype,
            "position": pe_dict["position"]
        }
        job.save_meta()

@parsebp.route("/parse", methods=["GET"])
def parse():
    """Trigger file parsing"""
    # TODO: Maybe implement external process to parse the files
    errors = False
    filename = request.args.get("filename")
    filetype = request.args.get("filetype")
    if filename is None:
        flash("No file provided", "alert-error")
        errors = True

    if filetype is None:
        flash("No filetype provided", "alert-error")
        errors = True

    filepath = os.path.join(app.config["UPLOAD_FOLDER"], filename)
    if not os.path.exists(filepath):
        flash("Selected file does not exist (any longer)", "alert-danger")
        errors = True

    if errors:
        return redirect(url_for("entry.index"))

    filetype = (
        FileType.AVERAGE if filetype == "average" else FileType.STANDARD_ERROR)
    job = jobs.enqueue_job("qc_app.parse.queued_parse", filepath, filetype)
    job.meta["filename"] = filename
    job.save_meta()
    return redirect(url_for("parse.parse_status", job_id=job.get_id()))

@parsebp.route("/status/<job_id>", methods=["GET"])
def parse_status(job_id):
    job = jobs.job(job_id)
    if job:
        job_id = job.get_id()
        progress = job.meta.get("progress", 0)
        status = job.meta["status"]
        filename = job.meta.get("filename", "uploaded file")
        if status == "success":
            return redirect(url_for("parse.results", job_id=job_id))

        if status == "parse-error":
            return redirect(url_for("parse.fail", job_id=job_id))

        return render_template(
            "job_progress.html",
            job_id = job_id,
            job_status = status,
            progress = progress,
            job_name = f"Parsing '{filename}'")

    return render_template("no_such_job.html", job_id=job_id)

@parsebp.route("/results/<job_id>", methods=["GET"])
def results(job_id):
    """Indicates success if parsing the file is successful"""
    return "STUB: Parse success!!!"

@parsebp.route("/fail", methods=["GET"])
def fail():
    """Indicates success if parsing the file is successful"""
    return "STUB: Parse Failure!!!"