from flask import Blueprint, current_app, request, jsonify
import hashlib
import time
from sqlalchemy.orm import sessionmaker
from sqlalchemy import desc

article = Blueprint('article', __name__)

# 匿名文列表
@article.route('/list', methods = ["GET"])
def listing():
    # variables
    rst = int(request.args.get("start"))
    count = int(request.args.get("count"))

    # db
    db = current_app.shared_resource.engine
    Session = sessionmaker(bind=db)
    session = Session()

    # get ctx
    table = current_app.shared_resource.SQLarticle
    res = session.query(table.id, table.ctx, table.igid, table.created_at, table.mark).order_by(desc(table.id)).filter(table.mark == 'visible').offset(rst).limit(count).all()

    # mapping
    res = [ {"id":r[0], "ctx":r[1], "igid":r[2], "created_at":r[3], "mark":r[4]} for r in res ]

    return jsonify(res)

# 獲取指定文章
@article.route("/get/<int:id>", methods = ["GET"])
def getarticle(id:int):
    db = current_app.shared_resource.engine
    Session = sessionmaker(bind=db)
    session = Session()

    # get ctx
    table = current_app.shared_resource.SQLarticle
    res = session.query(table.id, table.ctx, table.igid, table.created_at, table.mark).filter(table.id == id).filter(table.mark == 'visible').all()

    # mapping
    res = [ {"id":r[0], "ctx":r[1], "igid":r[2], "created_at":r[3], "mark":r[4]} for r in res ]

    return jsonify(res)

# 上傳文章
@article.route("/post", methods = ["POST"])
def posting():
    db = current_app.shared_resource.engine
    Session = sessionmaker(bind=db)
    session = Session()

    # content
    ctx = str(request.json["ctx"])
    if ctx is None: return "No brain no content"

    # hash
    seed = ctx + str(time.time())
    hash = hashlib.sha256(seed.encode()).hexdigest()

    # file processing

    # ig posting
    igid = None

    # mark
    mark = "visible"

    # pg commit
    table = current_app.shared_resource.SQLarticle
    data = table(hash = hash, ctx = ctx, igid = igid, mark = mark)
    session.add(data)
    session.commit()

    # pg getdata
    res = session.query(table.id, table.ctx, table.igid, table.created_at, table.mark).filter(table.hash == hash).all()
    res = [ {"id":r[0], "ctx":r[1], "igid":r[2], "created_at":r[3], "mark":r[4]} for r in res ]

    session.close()
    return jsonify(res)

# 只有發文者可以看到的獲取指定文章
# 只有發文者可以做到的刪除文章
@article.route("/own/<sha256>", methods = ["GET", "DELETE"])
def owner_getarticle(sha256:str):
    db = current_app.shared_resource.engine
    Session = sessionmaker(bind=db)
    session = Session()
    table = current_app.shared_resource.SQLarticle

    # 獲取指定文章
    if request.method == "GET":
        res = session.query(table.id, table.ctx, table.igid, table.created_at, table.mark, table.hash).filter(table.hash == sha256).all()
        res = [ {"id":r[0], "ctx":r[1], "igid":r[2], "created_at":r[3], "mark":r[4], "hash":r[5]} for r in res ]
        return jsonify(res)
    # 刪除指定文章
    elif request.method == "DELETE":
        res = session.query(table).filter(table.hash == sha256).first()
        session.delete(res)
        session.commit()
        return "OK", 200

    session.close()