# -*- coding: utf-8  -*-

import re
from os.path import expanduser
from threading import Lock

import oursql

from classes import BaseTask
import config
import wiki

class Task(BaseTask):
    """A task to generate statistics for WikiProject Articles for Creation.

    Statistics are stored in a MySQL database ("u_earwig_afc_statistics")
    accessed with oursql. Statistics are updated live while watching the recent
    changes IRC feed and saved once an hour, on the hour, to self.pagename.
    In the live bot, this is "Template:AFC statistics".
    """
    name = "afc_statistics"
    number = 2

    def __init__(self):
        self.cfg = cfg = config.tasks.get(self.name, {})

        # Set some wiki-related attributes:
        self.pagename = cfg.get("page", "Template:AFC statistics")
        default_summary = "Updating statistics for [[WP:WPAFC|WikiProject Articles for creation]]."
        self.summary = self.make_summary(cfg.get("summary", default_summary))

        # Templates used in chart generation:
        templates = cfg.get("templates", {})
        self.tl_header = templates.get("header", "AFC statistics/header")
        self.tl_row = templates.get("row", "AFC statistics/row")
        self.tl_footer = templates.get("footer", "AFC statistics/footer")

        # Establish a connection with our SQL database:
        kwargs = cfg.get("sql", {})
        kwargs["read_default_file"] = expanduser("~/.my.cnf")
        self.conn = oursql.connect(**kwargs)
        self.db_access_lock = Lock()

    def run(self, **kwargs):
        self.site = wiki.get_site()

        action = kwargs.get("action")
        if not action:
            return

        methods = {
            "save": self.save,
            "sync", self.sync,
            "edit": self.process_edit,
            "move": self.process_move,
            "delete": self.process_delete,
            "restore": self.process_restore,
        }

        method = methods.get(action)
        if method:
            method(**kwargs)            

    def save(self, **kwargs):
        if kwargs.get("fromIRC"):
            summary = " ".join((self.summary, "(!earwigbot)"))
        else:
            if self.shutoff_enabled():
                return
            summary = self.summary

        statistics = self.compile_charts()

        page = self.site.get_page(self.pagename)
        text = page.get()
        newtext = re.sub("(<!-- stat begin -->)(.*?)(<!-- stat end -->)",
                         statistics.join(("\\1\n", "\n\\3")), text,
                         flags=re.DOTALL)
        if newtext == text:
            return  # Don't edit the page if we're not adding anything

        newtext = re.sub("(<!-- sig begin -->)(.*?)(<!-- sig end -->)",
                         "\\1~~~ at ~~~~~\\3", newtext)
        page.edit(newtext, summary, minor=True, bot=True)

    def compile_charts(self):
        stats = ""
        with self.conn.cursor() as cursor, self.db_access_lock:
            cursor.execute("SELECT * FROM chart")
            for chart in cursor:
                stats += self.compile_chart(chart) + "\n"
        return stats[:-1]  # Drop the last newline

    def compile_chart(self, chart_info):
        chart_id, chart_title, special_title = chart_info

        chart = "|".join((self.tl_header, chart_title))
        if special_title:
            chart += "".join(("|", special_title))
        chart = "".join(("{{", chart, "}}"))

        query = "SELECT * FROM page JOIN row ON page_id = row_id WHERE row_chart = ?"
        with self.conn.cursor(oursql.DictCursor) as cursor:
            cursor.execute(query, (chart_id,))
            for page in cursor:
                chart += "\n" + self.compile_chart_row(page)

        chart += "".join(("\n{{", self.tl_footer, "}}"))
        return chart

    def compile_chart_row(self, page):
        row = "{0}|s={page_status}|t={page_title}|h={page_short}|z={page_size}|"
        row += "cr={page_create_user}|cd={page_create_time}|ci={page_create_oldid}|"
        row += "mr={page_modify_user}|md={page_modify_time}|mi={page_modify_oldid}|"

        page["page_create_time"] = self.format_time(page["page_create_time"])
        page["page_modify_time"] = self.format_time(page["page_modify_time"])

        if page["page_special_user"]:
            row += "sr={page_special_user}|sd={page_special_time}|si={page_special_oldid}|"
            page["page_special_time"] = self.format_time(page["page_special_time"])

        if page["page_notes"]:
            row += "n=1{page_notes}"

        return "".join(("{{", row.format(self.tl_row, **page), "}}"))

    def format_time(self, timestamp):
        return timestamp.strftime("%H:%M, %d %B %Y")

    def sync(self, **kwargs):
        with self.conn.cursor() as cursor, self.db_access_lock:
            self.sync_deleted(cursor)  # Remove deleted subs
            self.sync_oldids(cursor)   # Make sure all subs are up to date
            self.sync_pending(cursor)  # Add missed pending subs
            self.sync_old(cursor)      # Remove old declined and accepted subs

    def sync_deleted(self, cursor):
        pass

    def sync_oldids(self, cursor):
        pass

    def sync_pending(self, cursor):
        pass

    def sync_old(self, cursor):
        query = """DELETE FROM page, row USING page JOIN row ON page_id = row_id
        WHERE row_chart IN (4, 5) AND ADDTIME(page_special_time, '36:00:00')  < NOW()"""
        cursor.execute(query)

    def process_edit(self, page, **kwargs):
        pass

    def process_move(self, page, **kwargs):
        pass

    def process_delete(self, page, **kwargs):
        pass

    def process_restore(self, page, **kwargs):
        pass