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"""File parsing module"""
import os
import sqlite3
from functools import reduce

from redis import Redis
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_errors)

parsebp = Blueprint("parse", __name__)

def queued_parse(
        filepath: str, filetype: FileType, strainsfile: str, redis_url: str,
        dbpath: str):
    job = get_current_job()
    job_id = job.get_id()
    with Redis.from_url(redis_url) as rconn:
        dbconn = sqlite3.connect(dbpath)
        try:
            job_meta = jobs.update_meta(
                dbconn, job_id, status = "in-progress", progress = 0)
            parsed = parse_file(filepath, filetype, strain_names(strainsfile))
            for line, curr_size in parsed:
                job_meta = jobs.update_meta(
                    dbconn, job_id,
                    progress=((curr_size/job_meta["filesize"]) * 100),
                    message = f"Parsed {curr_size} bytes")

            os.remove(filepath)
            jobs_meta = jobs.update_meta(
                dbconn, job_id, progress = 100, status = "success",
                message = "no errors found")
        except ParseError as pe:
            pe_dict = pe.args[0]
            job_meta = jobs.update_meta(
                dbconn, job_id, status = "parse-error", results = {
                    "filename": os.path.basename(filepath), "filetype": filetype,
                    "position": pe_dict["position"],
                    "line_number": pe_dict["line_number"]
                })
        finally:
            dbconn.close()

def retrieve_dbpath():
    return os.path.join(app.config["UPLOAD_FOLDER"], "jobs.db")

@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"))

    jobs.create_jobs_table(retrieve_dbpath())
    filetype = (
        FileType.AVERAGE if filetype == "average" else FileType.STANDARD_ERROR)
    job = jobs.enqueue_job(
        "qc_app.parse.queued_parse", filepath, filetype,
        os.path.join(os.getcwd(), "etc/strains.csv"), app.config["REDIS_URL"],
        retrieve_dbpath())
    try:
        dbconn = sqlite3.connect(retrieve_dbpath())
        jobs.update_meta(
            dbconn, job.get_id(), filename=filename, filesize=os.stat(filepath).st_size,
            status="enqueued", progress=0)
    except Exception as exc:
        import traceback
        print(traceback.format_exc())
        dbconn.rollback()
    finally:
        dbconn.close()

    return redirect(url_for("parse.parse_status", job_id=job.get_id()))

@parsebp.route("/status/<job_id>", methods=["GET"])
def parse_status(job_id: str):
    try:
        dbconn = sqlite3.connect(retrieve_dbpath(), timeout=10)
        job = jobs.job(job_id)
        if job:
            job_id = job.get_id()
            job_meta = jobs.retrieve_meta(dbconn, job_id)
            progress = job_meta["progress"]
            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,
                message = job_meta.get("message", ""),
                job_name = f"Parsing '{filename}'")

        return render_template("no_such_job.html", job_id=job_id)
    except sqlite3.OperationalError:
        return redirect(url_for("parse.parse_status", job_id=job_id))
    except Exception as exc:
        import traceback
        print(traceback.format_exc())
        return exc
    finally:
        dbconn.close()

@parsebp.route("/results/<job_id>", methods=["GET"])
def results(job_id: str):
    """Show results of parsing..."""
    job = jobs.job(job_id)
    if job:
        try:
            dbconn = sqlite3.connect(retrieve_dbpath())
            job_meta = jobs.retrieve_meta(dbconn, job_id)
            filename = job_meta["filename"]
            errors = job_meta.get("errors", [])
            return render_template(
                "parse_results.html",
                errors=errors,
                job_name = f"Parsing '{filename}'",
                starting_line_number=job_meta.get("starting_line_number", 0))
        except Exception as exc:
            import traceback
            print(traceback.format_exc())
        finally:
            dbconn.close()

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

def queued_collect_errors(
        filepath: str, filetype: FileType, strainsfile: str, redis_url: str,
        dbpath: str, seek_pos: int = 0):
    job = get_current_job()
    job_id = job.get_id()
    errors = []
    count = 0
    with Redis.from_url(redis_url) as rconn:
        try:
            dbconn = sqlite3.connect(dbpath)
            job_meta = jobs.retrieve_meta(dbconn, job.get_id())
            for error in parse_errors(
                    filepath, filetype, strain_names(strainsfile),
                    seek_pos):
                count = count + 1
                progress  = ((error["position"] / job_meta["filesize"]) * 100)
                job_meta = jobs.update_meta(
                    dbconn, job_id, message = f"Collected {count} errors",
                    progress = progress)
                errors.append(error)

            job_meta = jobs.update_meta(
                dbconn, job_id, errors = errors, progress = 100, status = "success")
            os.remove(filepath)
        except Exception as exc:
            dbconn.rollback()
        finally:
            dbconn.close()

@parsebp.route("/fail/<job_id>", methods=["GET"])
def fail(job_id: str):
    """Handle parsing failure"""
    try:
        dbpath = retrieve_dbpath()
        dbconn = sqlite3.connect(dbpath)
        old_job = jobs.job(job_id)
        if old_job:
            job_id = old_job.get_id()
            old_meta = jobs.retrieve_meta(dbconn, job_id)
            progress = old_meta["progress"]
            status = old_meta["status"]
            results = old_meta["results"]
            filename = old_meta["filename"]

            new_job = jobs.enqueue_job(
                "qc_app.parse.queued_collect_errors",
                os.path.join(
                    app.config["UPLOAD_FOLDER"], old_meta["filename"]),
                results["filetype"], os.path.join(os.getcwd(), "etc/strains.csv"),
                app.config["REDIS_URL"], dbpath, results["position"])
            jobs.update_meta(
                dbconn, new_job.get_id(), status =  "Collecting Errors",
                filename = old_meta["filename"], filesize = old_meta["filesize"],
                starting_line_number = results["line_number"],
                progress = progress)
            return redirect(url_for("parse.parse_status", job_id=new_job.get_id()))

        return render_template("no_such_job.html", job_id=job_id)
    except Exception as exc:
        dbconn.rollback()
    finally:
        dbconn.close()