from flask import Blueprint, current_app, request, jsonify
import hashlib
import time
from utils import logger, pgclass, setting_loader
from sqlalchemy.orm import sessionmaker
from sqlalchemy import desc

"""
TODO:
- Image & Video
- IG post
- admin (看文，隱藏文章，刪文，[新增用戶，刪除用戶](用戶管理))

- log 的方式之後要重新設計
- IP Record (deploy之前配合rev proxy)
"""

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 = pgclass.SQLarticle
    res = session.query(table.id, table.ctx, table.igid, table.created_at, table.mark).order_by(desc(table.id)).filter(table.mark == 'visible', table.reference == None).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 = pgclass.SQLarticle
    res = session.query(table.id, table.ctx, table.igid, table.created_at, table.mark, table.reference).filter(table.id == id).filter(table.mark == 'visible').all()

    # mapping
    resfn = []
    for r in res:
        rd = {"id":r[0], "ctx":r[1], "igid":r[2], "created_at":r[3], "mark":r[4], "reference":r[5]}
        comments = session.query(table.id).filter(table.reference == int(r[0]), table.mark == "visible").all()
        rd["comment"] = [ c[0] for c in comments ]
        resfn.append(rd)

    return jsonify(resfn)

# 上傳文章 / 留言
@article.route("/post", methods = ["POST"])
def posting():
    # db
    db = current_app.shared_resource.engine
    Session = sessionmaker(bind=db)
    session = Session()
    table = pgclass.SQLarticle
    # loadset
    opt = setting_loader.loadset()
    chk_before_post = opt["Check_Before_Post"]

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

    # reference
    ref = request.json["ref"]
    if not (ref is None):   # 如果ref不是null
        ref = str(ref)      # 轉字串
        if not (ref == ""): # 如果不是空字串 -> 檢查
            if not ref.isdigit(): return "Invalid Reference" # 檢查是不是數字
            # 檢查是不是指向存在的文章
            chk = session.query(table).filter(table.id == ref, table.mark == "visible").first()
            if chk is None: return "Invalid Reference"
            # 檢查指向的文章是否也是留言
            if not(chk.reference is None): return "Invalid Reference"
        else:               # 如果是空字串 -> 轉 null object
            ref = None
    
    # IP
    ip = request.remote_addr

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

    # file processing

    # ig posting
    if chk_before_post:
        igid = None
    # Go posting
    igid = None
    # Coming Soon...

    # mark
    if chk_before_post: mark = "pending"
    else: mark = "visible"

    # posting
    data = table(hash = hash, ctx = ctx, igid = igid, mark = mark, reference = ref, ip = ip)
    session.add(data)

    # commit
    session.commit()

    # pg getdata
    res = session.query(table.id, table.ctx, table.igid, table.created_at, table.mark, table.hash, table.reference).filter(table.hash == hash).all()
    res = [ {"id":r[0], "ctx":r[1], "igid":r[2], "created_at":r[3], "mark":r[4], "hash":r[5], "reference":r[6]} for r in res ]
    session.close()

    # logger
    logger.logger(db, "newpost", "Insert (id=%d): posts (point to %s) / %s"%(res[0]["id"], ref, mark))
    
    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 = pgclass.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, table.reference).filter(table.hash == sha256).all()
        resfn = []
        for r in res:
            rd = {"id":r[0], "ctx":r[1], "igid":r[2], "created_at":r[3], "mark":r[4], "hash":r[5], "reference":r[6]}
            comments = session.query(table.id).filter(table.reference == int(r[0])).all()
            rd["comment"] = [ c[0] for c in comments ]
            resfn.append(rd)
        return jsonify(resfn)
    # 刪除指定文章跟他們的留言
    elif request.method == "DELETE":
        rcl = []
        res = session.query(table).filter(table.hash == sha256).first()     # 本體
        resc = session.query(table).filter(table.reference == res.id).all() # 留言
        # 刪留言
        for c in resc:
            rcl.append(c.id)
            session.delete(c)
        # 刪本體
        session.delete(res)
        # commit
        session.commit()
        # logger
        logger.logger(db, "delpost", "Delete (id=%d): posts / comments: %s / last status: %s"%(res.id, str(rcl), res.mark))
        return "OK", 200

    session.close()