from flask import Blueprint, render_template, abort, redirect, url_for, flash, make_response, g, request
from flask_wtf import FlaskForm
from flask_login import login_required, current_user
from wtforms import HiddenField, TextAreaField, StringField, SelectMultipleField, SubmitField, ValidationError
from wtforms.validators import DataRequired, Length
from typing import Optional

import app
from sql.base import DBBit
from sql.statistics import add_blog_click, add_archive_click
from object.blog import BlogArticle
from object.comment import Comment
from object.archive import Archive
from configure import conf

docx = Blueprint("docx", __name__)


class EditorMD(FlaskForm):
    content = TextAreaField("博客内容", validators=[DataRequired(message="必须输入博客文章")])


class WriteBlogForm(EditorMD):
    title = StringField("标题", description="博文主标题",
                        validators=[
                            DataRequired(message="必须填写标题"),
                            Length(1, 20, message="标题长度1-20个字符")])
    subtitle = StringField("副标题", description="博文副标题",
                           validators=[Length(-1, 20, message="副标题长度20个字符以内")])
    archive = SelectMultipleField("归档", coerce=int)
    submit = SubmitField("提交博客")

    def __init__(self, default: bool = False, **kwargs):
        super().__init__(**kwargs)
        if default:
            self.content.data = "# Blog Title\n## Blog subtitle\nHello, World"
        archive = Archive.get_archive_list()
        self.archive_res = []
        self.archive_choices = [(-1, "None")]
        for i in archive:
            self.archive_res.append(i.id)
            self.archive_choices.append((i.id, f"{i.name} ({i.count})"))
        self.archive.choices = self.archive_choices

    def validate_archive(self, field):
        if -1 in field.data:
            if len(field.data) != 1:
                raise ValidationError("归档指定错误(none归档不能和其他归档同时被指定)")
        else:
            for i in field.data:
                if i not in self.archive_res:
                    raise ValidationError("错误的归档被指定")


class UpdateBlogForm(EditorMD):
    blog_id = HiddenField("ID", validators=[DataRequired()])
    submit = SubmitField("更新博客")

    def __init__(self, blog: Optional[BlogArticle] = None, **kwargs):
        super().__init__(**kwargs)
        if blog is not None:
            self.blog_id.data = blog.id
            self.content.data = blog.content


class UpdateBlogArchiveForm(FlaskForm):
    blog_id = HiddenField("ID", validators=[DataRequired()])
    archive = SelectMultipleField("归档", coerce=int)
    add = SubmitField("加入归档")
    sub = SubmitField("去除归档")

    def __init__(self, blog: Optional[BlogArticle] = None, **kwargs):
        super().__init__(**kwargs)
        archive = Archive.get_archive_list()
        self.archive_res = []
        self.archive_choices = []
        for i in archive:
            archive_id = i.id
            self.archive_res.append(archive_id)
            self.archive_choices.append((archive_id, f"{i.name} ({i.count})"))
        self.archive.choices = self.archive_choices
        if blog is not None:
            self.archive_data = []
            self.archive.data = self.archive_data
            for a in blog.archive:
                a: Archive
                self.archive_data.append(a)
            self.blog_id.data = blog.id

    def validate_archive(self, field):
        for i in field.data:
            if i not in self.archive_res:
                raise ValidationError("错误的归档被指定")


class WriteCommentForm(FlaskForm):
    content = TextAreaField("", description="评论正文",
                            validators=[DataRequired(message="请输入评论的内容"),
                                        Length(1, 100, message="请输入1-100个字的评论")])
    submit = SubmitField("评论")


def __load_docx_page(page: int, form: WriteBlogForm):
    if page < 1:
        app.HBlogFlask.print_user_opt_fail_log(f"Load docx list with error page({page})")
        abort(404)
        return

    blog_list = BlogArticle.get_blog_list(limit=20, offset=(page - 1) * 20)
    max_page = app.HBlogFlask.get_max_page(BlogArticle.get_blog_count(), 20)
    page_list = app.HBlogFlask.get_page("docx.docx_page", page, max_page)
    app.HBlogFlask.print_load_page_log(f"docx list (page: {page})")
    return render_template("docx/docx.html",
                           page=page,
                           cache_str=f":{page}",
                           blog_list=blog_list,
                           page_list=page_list,
                           form=form,
                           show_delete=current_user.check_role("DeleteBlog"))


@docx.route('/')
def docx_page():
    page = request.args.get("page", 1, type=int)
    return __load_docx_page(page, WriteBlogForm(True))


@docx.route('/archive')
def archive_page():
    page = request.args.get("page", 1, type=int)
    archive = request.args.get("archive", 1, type=int)
    if page < 1:
        app.HBlogFlask.print_user_opt_fail_log(f"Load archive-docx list with error page({page}) archive: {archive}")
        abort(404)
        return

    blog_list = BlogArticle.get_blog_list(archive_id=archive, limit=20, offset=(page - 1) * 20)
    max_page = app.HBlogFlask.get_max_page(BlogArticle.get_blog_count(archive_id=archive), 20)
    page_list = app.HBlogFlask.get_page("docx.archive_page", page, max_page)
    add_archive_click(archive)
    app.HBlogFlask.print_load_page_log(f"archive-docx list (archive-id: {archive} page: {page})")
    return render_template("docx/docx.html",
                           page=page,
                           cache_str=f":{page}",
                           blog_list=blog_list,
                           page_list=page_list,
                           form=None)


def __load_article_page(blog_id: int, form: WriteCommentForm,
                        view: Optional[UpdateBlogForm] = None,
                        archive: Optional[UpdateBlogArchiveForm] = None):
    article = BlogArticle(blog_id)
    if article is None:
        app.HBlogFlask.print_user_opt_fail_log(f"Load article with error id({blog_id})")
        abort(404)
        return
    app.HBlogFlask.print_load_page_log(f"article (id: {blog_id})")
    if view is None:
        view = UpdateBlogForm(article)
    if archive is None:
        archive = UpdateBlogArchiveForm(article)
    add_blog_click(article.id)
    return render_template("docx/article.html",
                           article=article,
                           cache_str=f":{article.id}",
                           archive_list=article.archive,
                           form=form,
                           view=view,
                           archive=archive,
                           can_update=current_user.check_role("WriteBlog"),
                           show_delete=current_user.check_role("DeleteComment"),
                           show_email=current_user.check_role("ReadUserInfo"))


@docx.route('/article')
def article_page():
    blog_id = request.args.get("blog", 1, type=int)
    return __load_article_page(blog_id, WriteCommentForm())


@docx.route('/article/download')
def article_down_page():
    blog_id = request.args.get("blog", 1, type=int)
    article = BlogArticle(blog_id)
    if article is None:
        app.HBlogFlask.print_user_opt_fail_log(f"Download article with error id({blog_id})")
        abort(404)
        return

    response = make_response(article.content)
    response.headers["Content-Disposition"] = f"attachment;filename={article.title.encode().decode('latin-1')}.md"
    app.HBlogFlask.print_load_page_log(f"download article (id: {blog_id})")
    return response


@docx.route('/article/create', methods=["POST"])
@login_required
@app.form_required(WriteBlogForm,
                   "write blog",
                   lambda form: __load_docx_page(request.args.get("page", 1, type=int), form))
@app.role_required("WriteBlog", "write blog")
def create_docx_page():
    form: WriteBlogForm = g.form
    title = form.title.data
    subtitle = form.subtitle.data
    archive = []
    if -1 not in form.archive.data:
        for i in form.archive.data:
            i = Archive(i)
            if i is not None:
                archive.append(i)

    if BlogArticle.create(title, subtitle, form.content.data, archive, current_user):
        app.HBlogFlask.print_sys_opt_success_log("write blog")
        flash(f"博客 {title} 发表成功")
    else:
        app.HBlogFlask.print_sys_opt_fail_log("write blog")
        flash(f"博客 {title} 发表失败")
    return redirect(url_for("docx.docx_page", page=1))


@docx.route('/article/update', methods=["POST"])
@login_required
@app.form_required(UpdateBlogForm, "update blog",
                   lambda form: __load_article_page(form.id.data, WriteCommentForm(), form))
@app.role_required("WriteBlog", "write blog")
def update_docx_page():
    form: UpdateBlogForm = g.form
    if BlogArticle(form.blog_id.data).update(form.content.data):
        app.HBlogFlask.print_sys_opt_success_log("update blog")
        flash("博文更新成功")
    else:
        app.HBlogFlask.print_sys_opt_fail_log("update blog")
        flash("博文更新失败")
    return redirect(url_for("docx.article_page", blog=form.blog_id.data))


@docx.route("/article/delete")
@login_required
@app.role_required("DeleteBlog", "delete blog")
def delete_blog_page():
    blog_id = request.args.get("blog", None, type=int)
    if not blog_id:
        return abort(400)
    if BlogArticle(blog_id).delete():
        app.HBlogFlask.print_sys_opt_success_log("delete blog")
        flash("博文删除成功")
    else:
        app.HBlogFlask.print_sys_opt_fail_log("delete blog")
        flash("博文删除失败")
    return redirect(url_for("docx.docx_page", page=1))


@docx.route("/article/set/top")
@login_required
@app.role_required("WriteBlog", "set blog top")
def set_blog_top_page():
    blog_id = request.args.get("blog", None, type=int)
    top = request.args.get("top", 0, type=int) != 0
    if not blog_id:
        return abort(400)
    blog = BlogArticle(blog_id)
    blog.top = top
    if top == blog.top:
        app.HBlogFlask.print_sys_opt_success_log(f"set blog top ({top})")
        flash(f"博文{'取消' if not top else ''}置顶成功")
    else:
        app.HBlogFlask.print_sys_opt_fail_log(f"set blog top ({top})")
        flash(f"博文{'取消' if not top else ''}置顶失败")
    return redirect(url_for("docx.article_page", blog=blog_id))


@docx.route("/article/set/archive", methods=["POST"])
@login_required
@app.form_required(UpdateBlogArchiveForm, "update archive",
                   lambda form: __load_article_page(form.id.data, WriteCommentForm(), UpdateBlogForm(), form))
@app.role_required("WriteBlog", "update archive")
def update_archive_page():
    form: UpdateBlogArchiveForm = g.form
    article = BlogArticle(form.blog_id.data)
    add = request.args.get("add", 0, type=int) != 0
    for i in form.archive.data:
        if add:
            article.add_to_archive(i)
        else:
            article.sub_from_archive(i)
    flash("归档设定完成")
    return redirect(url_for("docx.article_page", blog=form.blog_id.data))


@docx.route('/comment/create', methods=["POST"])
@login_required
@app.form_required(WriteCommentForm, "write comment",
                   lambda form: __load_article_page(request.args.get("blog", 1, type=int), form))
@app.role_required("WriteComment", "write comment")
def comment_page():
    blog_id = request.args.get("blog", 1, type=int)
    form: WriteCommentForm = g.form
    content = form.content.data
    if Comment.create(BlogArticle(blog_id), current_user, content):
        app.HBlogFlask.print_user_opt_success_log("comment")
        flash("评论成功")
    else:
        app.HBlogFlask.print_user_opt_error_log("comment")
        flash("评论失败")
    return redirect(url_for("docx.article_page", blog=blog_id))


@docx.route("/comment/delete")
@login_required
@app.role_required("DeleteComment", "delete comment")
def delete_comment_page():
    comment_id = request.args.get("comment", 1, type=int)
    comment = Comment(comment_id)
    blog_id = comment.blog.id
    if blog_id == -1:
        abort(404)

    if comment.delete():
        app.HBlogFlask.print_sys_opt_success_log("delete comment")
        flash("博文评论删除成功")
    else:
        app.HBlogFlask.print_sys_opt_fail_log("delete comment")
        flash("博文评论删除失败")
    return redirect(url_for("docx.article_page", blog=blog_id))


@docx.context_processor
@app.cache.cached(timeout=conf["CACHE_EXPIRE"], key_prefix="inject_base:docx")
def inject_base():
    """ docx 默认模板变量 """
    return {"top_nav": ["", "", "active", "", "", ""]}