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

import io
import os, re, textwrap, json, csv
from tabulate import tabulate # type: ignore

from jwutils.log import *

def rows_pretty(rows): # export
    if type(rows) == dict:
        rows = [rows]
    out = []
    for row in rows:
        out.append(json.dumps(row, sort_keys=True, indent=4, default=str))
    return '\n'.join(out)

def rows_duplicates(rows, log_prio=INFO, caller=None): # export
    def __equal(r1, r2):
        for col in set(r1.keys()) | set(r2.keys()):
            if col in r1:
                if col not in r2:
                    return False
            else:
                if col in r2:
                    return False
            if r1[col] != r2[col]:
                return False
        return True
    ret = []
    last = len(rows) - 1
    i = last
    while last > 0:
        for i in reversed(range(0, last-1)):
            if __equal(rows[last], rows[i]):
                ret.append(last)
                last -= 1
                break
        last -= 1
    return ret

def rows_remove(rows, callback=None, candidates=None, log_prio=INFO, caller=None): # export

    def __is_remove_candidate(row):
        for remove_row in candidates:
            for col, val in row.items():
                if not col in remove_row.keys():
                    break
                if val != remove_row[col]:
                    break
            else:
                return True
        return False

    if caller is None:
        caller = get_caller_pos()
    if callback is None:
        if candidates is not None:
            callback = __is_remove_candidate
        else:
            raise Exception('No criterion to remove rows')
    remove = list()
    index = -1
    for row in rows:
        index += 1
        if callback(row):
            remove.append(index)
            continue
    for index in reversed(remove):
        slog(log_prio, f'Removing row {rows[index]}', caller=caller)
        del rows[index]

def rows_select(rows, rules): # export
    ret = []
    for row in rows:
        for rule in rules:
            if type(rule) == tuple():
                search_rule = rule[0]
            else:
                search_rule = rule
            for col_name, expr in search_rule.items():
                if not re.search(expr, row[col_name]):
                    break
            else:
                ret.append(row)
                break
    return ret

def rows_rewrite_regex(rows, rules): # export
    for row in rows:
        for rule in rules:
            try:
                for col_name, expr in rule[0].items():
                    if not re.search(expr, row[col_name]):
                        break
                else:
                    for exec_col_name, exec_val in rule[1].items():
                        slog(INFO, f'Rewriting {row} {row.get(exec_col_name)} -> {exec_val}')
                        row[exec_col_name] = exec_val
            except Exception as e:
                slog(ERR, f'Failed to run rule {rule} against {row} ({e})')
                raise

def rows_check_not_null(rows, keys, log_prio=WARNING, buf=None, stat_key=None, throw=True, caller=None): # export
    if type(keys) == str:
        keys = [keys]
    if caller is None:
        caller = get_caller_pos()
    count = 0
    stats = dict()
    if buf is None:
        buf = []
    else:
        buf.clear()
    for row in rows:
        for key in keys:
            if row.get(key) is None:
                slog(log_prio, f'{key} is missing in row {row}', caller=caller)
                buf.append(row)
                if stat_key is not None:
                    stat_val = row[stat_key]
                    if not stat_val in stats.keys():
                        stats[stat_val] = 0
                    stats[stat_val] += 1
                count += 1
                break
    if count > 0:
        if stat_key is not None:
            i = 0
            for k, v in reversed(sorted(stats.items(), key=lambda item: item[1])):
                i += 1
                slog(ERR, f'{i:>3}. {k:<23}: {v}', caller=caller)
        if throw:
            raise Exception(f'Found {count} rows violating null-constraint for keys {keys}')
    return buf

def rows_dumps(rows, log_prio=INFO, caller=None, use_cols=None, skip_cols=None, table_name=None, out_path='log', heading=None, lead=None, tablefmt=None): # export

    headers = 'keys'
    dump_rows = rows
    if use_cols is not None:
        #dump_rows = {col: rows[col] for col in use_cols}
        new_dump_rows = []
        for row in dump_rows:
            new_dump_rows.append({col: row.get(col) for col in use_cols})
        dump_rows = new_dump_rows
    if skip_cols is not None:
        new_dump_rows = []
        for row in dump_rows:
            new_row = {}
            for col, val in row.items():
                if col in skip_cols:
                    continue
                new_row[col] = val
            new_dump_rows.append(new_row)
        dump_rows = new_dump_rows
    out = header = footer = ""
    match tablefmt:
        case 'html':
            if heading is not None:
                heading = f'<h1>{heading}</h1>\n'
            if type(lead) == str:
                lead = f'<div class="lead">\n    {lead}\n</div>\n'
            elif type(lead) == list:
                l = '<ul>\n'
                for li in lead:
                    l += f'<li>{li}</li>\n'
                l += '</ul>\n'
                lead = l
            header=textwrap.dedent('''\
                <html>
                    <head>
                        <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
                        <script>
                            $(document).ready(function()
                            {
                                $("tr:odd").css({ "background-color":"#ffa"});
                            });
                        </script>
                        <style>
                            tbody td {
                                /* padding: 30px; */
                            }
                            tbody tr:nth-child(odd) {
                                background-color: #4C8BF5;
                            }
                        </style>
                    </head>
                    <body>
                ''')
            footer = textwrap.dedent('''
                    </body>
                </html>
                ''')
        case _:
            if type(heading) == str:
                heading = '\n' + heading
            if type(lead) == str:
                pass
            elif type(lead) == list:
                l =''
                for li in lead:
                    l += f'  - {li}\n'
                lead = '\n\n' + l + '\n'

    if heading is None:
        heading = ''
    if lead is None:
        lead = ''

    return header + heading + lead + tabulate(dump_rows, headers=headers, tablefmt=tablefmt) + footer

def rows_dump(rows, log_prio=INFO, caller=None, use_cols=None, skip_cols=None, table_name=None, out_path='log', heading=None, lead=None, tablefmt=None): # export

    if not prio_gets_logged(log_prio):
        return

    if caller is None:
        caller = get_caller_pos()
    if tablefmt is None and out_path:
        tablefmt = os.path.splitext(out_path)[1][1:]

    out = rows_dumps(rows, log_prio=log_prio, caller=caller, use_cols=use_cols, skip_cols=skip_cols, table_name=table_name, heading=heading, lead=lead, tablefmt=tablefmt)

    match out_path:
        case 'log':
            slog_m(log_prio, out, caller=caller)
        case _:
            with open(out_path, 'w') as fp:
                fp.write(out)

def rows_to_csv(rows, use_tmpfile=False): # export
    def __write(rows, out):
        writer = csv.DictWriter(out, fieldnames=field_names, delimiter=';', quotechar='"', quoting=csv.QUOTE_NONNUMERIC)
        writer.writeheader()
        for row in rows:
            writer.writerow(row)

    field_names = []
    for row in rows:
        for col in row.keys():
            if col not in field_names:
                field_names.append(col)
    if True:
        out = io.StringIO()
        __write(rows, out)
        return out.getvalue()
    import tempfile
    with tempfile.TemporaryFile(mode='w', newline='') as out:
        __write(rows, out)
        out.seek(0)
        return out.read()