import sqlstring from 'sqlstring';

import { DateTime, stripLeadingAndTrailingSlashes } from '@openpanel/common';
import type {
  IChartEventFilter,
  IChartInput,
  IChartRange,
  IGetChartDataInput,
} from '@openpanel/validation';

import { TABLE_NAMES, formatClickhouseDate } from '../clickhouse/client';
import { createSqlBuilder } from '../sql-builder';

export function transformPropertyKey(property: string) {
  const propertyPatterns = ['properties', 'profile.properties'];
  const match = propertyPatterns.find((pattern) =>
    property.startsWith(`${pattern}.`),
  );

  if (!match) {
    return property;
  }

  if (property.includes('*')) {
    return property
      .replace(/^properties\./, '')
      .replace('.*.', '.%.')
      .replace(/\[\*\]$/, '.%')
      .replace(/\[\*\].?/, '.%.');
  }

  return `${match}['${property.replace(new RegExp(`^${match}.`), '')}']`;
}

export function getSelectPropertyKey(property: string) {
  if (property === 'has_profile') {
    return `if(profile_id != device_id, 'true', 'false')`;
  }

  const propertyPatterns = ['properties', 'profile.properties'];

  const match = propertyPatterns.find((pattern) =>
    property.startsWith(`${pattern}.`),
  );
  if (!match) return property;

  if (property.includes('*')) {
    return `arrayMap(x -> trim(x), mapValues(mapExtractKeyLike(${match}, ${sqlstring.escape(
      transformPropertyKey(property),
    )})))`;
  }

  return `${match}['${property.replace(new RegExp(`^${match}.`), '')}']`;
}

export function getChartSql({
  event,
  breakdowns,
  interval,
  startDate,
  endDate,
  projectId,
  limit,
  timezone,
}: IGetChartDataInput & { timezone: string }) {
  const {
    sb,
    join,
    getWhere,
    getFrom,
    getJoins,
    getSelect,
    getOrderBy,
    getGroupBy,
    getFill,
  } = createSqlBuilder();

  sb.where = getEventFiltersWhereClause(event.filters);
  sb.where.projectId = `project_id = ${sqlstring.escape(projectId)}`;

  if (event.name !== '*') {
    sb.select.label_0 = `${sqlstring.escape(event.name)} as label_0`;
    sb.where.eventName = `name = ${sqlstring.escape(event.name)}`;
  } else {
    sb.select.label_0 = `'*' as label_0`;
  }

  const anyFilterOnProfile = event.filters.some((filter) =>
    filter.name.startsWith('profile.'),
  );
  const anyBreakdownOnProfile = breakdowns.some((breakdown) =>
    breakdown.name.startsWith('profile.'),
  );

  if (anyFilterOnProfile || anyBreakdownOnProfile) {
    sb.joins.profiles = `LEFT ANY JOIN (SELECT 
      id as "profile.id",
      email as "profile.email",
      first_name as "profile.first_name",
      last_name as "profile.last_name",
      properties as "profile.properties"
    FROM ${TABLE_NAMES.profiles} FINAL WHERE project_id = ${sqlstring.escape(projectId)}) as profile on profile.id = profile_id`;
  }

  sb.select.count = 'count(*) as count';
  switch (interval) {
    case 'minute': {
      sb.fill = `FROM toStartOfMinute(toDateTime('${startDate}')) TO toStartOfMinute(toDateTime('${endDate}')) STEP toIntervalMinute(1)`;
      sb.select.date = 'toStartOfMinute(created_at) as date';
      break;
    }
    case 'hour': {
      sb.fill = `FROM toStartOfHour(toDateTime('${startDate}')) TO toStartOfHour(toDateTime('${endDate}')) STEP toIntervalHour(1)`;
      sb.select.date = 'toStartOfHour(created_at) as date';
      break;
    }
    case 'day': {
      sb.fill = `FROM toStartOfDay(toDateTime('${startDate}')) TO toStartOfDay(toDateTime('${endDate}')) STEP toIntervalDay(1)`;
      sb.select.date = 'toStartOfDay(created_at) as date';
      break;
    }
    case 'week': {
      sb.fill = `FROM toStartOfWeek(toDateTime('${startDate}'), 1, '${timezone}') TO toStartOfWeek(toDateTime('${endDate}'), 1, '${timezone}') STEP toIntervalWeek(1)`;
      sb.select.date = `toStartOfWeek(created_at, 1, '${timezone}') as date`;
      break;
    }
    case 'month': {
      sb.fill = `FROM toStartOfMonth(toDateTime('${startDate}'), '${timezone}') TO toStartOfMonth(toDateTime('${endDate}'), '${timezone}') STEP toIntervalMonth(1)`;
      sb.select.date = `toStartOfMonth(created_at, '${timezone}') as date`;
      break;
    }
  }
  sb.groupBy.date = 'date';
  sb.orderBy.date = 'date ASC';

  if (startDate) {
    sb.where.startDate = `created_at >= toDateTime('${formatClickhouseDate(startDate)}')`;
  }

  if (endDate) {
    sb.where.endDate = `created_at <= toDateTime('${formatClickhouseDate(endDate)}')`;
  }

  if (breakdowns.length > 0 && limit) {
    sb.where.bar = `(${breakdowns.map((b) => getSelectPropertyKey(b.name)).join(',')}) IN (
      SELECT ${breakdowns.map((b) => getSelectPropertyKey(b.name)).join(',')}
      FROM ${TABLE_NAMES.events}
      ${getJoins()}
      ${getWhere()}
      GROUP BY ${breakdowns.map((b) => getSelectPropertyKey(b.name)).join(',')}
      ORDER BY count(*) DESC
      LIMIT ${limit}
    )`;
  }

  breakdowns.forEach((breakdown, index) => {
    const key = `label_${index}`;
    sb.select[key] = `${getSelectPropertyKey(breakdown.name)} as ${key}`;
    sb.groupBy[key] = `${key}`;
  });

  if (event.segment === 'user') {
    sb.select.count = 'countDistinct(profile_id) as count';
  }

  if (event.segment === 'session') {
    sb.select.count = 'countDistinct(session_id) as count';
  }

  if (event.segment === 'user_average') {
    sb.select.count =
      'COUNT(*)::float / COUNT(DISTINCT profile_id)::float as count';
  }

  if (event.segment === 'property_sum' && event.property) {
    sb.select.count = `sum(toFloat64(${getSelectPropertyKey(event.property)})) as count`;
    sb.where.property = `${getSelectPropertyKey(event.property)} IS NOT NULL AND notEmpty(${getSelectPropertyKey(event.property)})`;
  }

  if (event.segment === 'property_average' && event.property) {
    sb.select.count = `avg(toFloat64(${getSelectPropertyKey(event.property)})) as count`;
    sb.where.property = `${getSelectPropertyKey(event.property)} IS NOT NULL AND notEmpty(${getSelectPropertyKey(event.property)})`;
  }

  if (event.segment === 'property_max' && event.property) {
    sb.select.count = `max(toFloat64(${getSelectPropertyKey(event.property)})) as count`;
    sb.where.property = `${getSelectPropertyKey(event.property)} IS NOT NULL AND notEmpty(${getSelectPropertyKey(event.property)})`;
  }

  if (event.segment === 'property_min' && event.property) {
    sb.select.count = `min(toFloat64(${getSelectPropertyKey(event.property)})) as count`;
    sb.where.property = `${getSelectPropertyKey(event.property)} IS NOT NULL AND notEmpty(${getSelectPropertyKey(event.property)})`;
  }

  if (event.segment === 'one_event_per_user') {
    sb.from = `(
      SELECT DISTINCT ON (profile_id) * from ${TABLE_NAMES.events} ${getJoins()} WHERE ${join(
        sb.where,
        ' AND ',
      )}
        ORDER BY profile_id, created_at DESC
      ) as subQuery`;
    sb.joins = {};

    const sql = `${getSelect()} ${getFrom()} ${getJoins()} ${getWhere()} ${getGroupBy()} ${getOrderBy()} ${getFill()}`;
    console.log('-- Report --');
    console.log(sql.replaceAll(/[\n\r]/g, ' '));
    console.log('-- End --');
    return sql;
  }

  const sql = `${getSelect()} ${getFrom()} ${getJoins()} ${getWhere()} ${getGroupBy()} ${getOrderBy()} ${getFill()}`;
  console.log('-- Report --');
  console.log(sql.replaceAll(/[\n\r]/g, ' '));
  console.log('-- End --');
  return sql;
}

export function getEventFiltersWhereClause(filters: IChartEventFilter[]) {
  const where: Record<string, string> = {};
  filters.forEach((filter, index) => {
    const id = `f${index}`;
    const { name, value, operator } = filter;

    if (
      value.length === 0 &&
      operator !== 'isNull' &&
      operator !== 'isNotNull'
    ) {
      return;
    }

    if (name === 'has_profile') {
      if (value.includes('true')) {
        where[id] = 'profile_id != device_id';
      } else {
        where[id] = 'profile_id = device_id';
      }
      return;
    }

    if (
      name.startsWith('properties.') ||
      name.startsWith('profile.properties.')
    ) {
      const propertyKey = getSelectPropertyKey(name);
      const isWildcard = propertyKey.includes('%');
      const whereFrom = getSelectPropertyKey(name);

      switch (operator) {
        case 'is': {
          if (isWildcard) {
            where[id] = `arrayExists(x -> ${value
              .map((val) => `x = ${sqlstring.escape(String(val).trim())}`)
              .join(' OR ')}, ${whereFrom})`;
          } else {
            if (value.length === 1) {
              where[id] =
                `${whereFrom} = ${sqlstring.escape(String(value[0]).trim())}`;
            } else {
              where[id] = `${whereFrom} IN (${value
                .map((val) => sqlstring.escape(String(val).trim()))
                .join(', ')})`;
            }
          }
          break;
        }
        case 'isNot': {
          if (isWildcard) {
            where[id] = `arrayExists(x -> ${value
              .map((val) => `x != ${sqlstring.escape(String(val).trim())}`)
              .join(' OR ')}, ${whereFrom})`;
          } else {
            if (value.length === 1) {
              where[id] =
                `${whereFrom} != ${sqlstring.escape(String(value[0]).trim())}`;
            } else {
              where[id] = `${whereFrom} NOT IN (${value
                .map((val) => sqlstring.escape(String(val).trim()))
                .join(', ')})`;
            }
          }
          break;
        }
        case 'contains': {
          if (isWildcard) {
            where[id] = `arrayExists(x -> ${value
              .map(
                (val) =>
                  `x LIKE ${sqlstring.escape(`%${String(val).trim()}%`)}`,
              )
              .join(' OR ')}, ${whereFrom})`;
          } else {
            where[id] = `(${value
              .map(
                (val) =>
                  `${whereFrom} LIKE ${sqlstring.escape(`%${String(val).trim()}%`)}`,
              )
              .join(' OR ')})`;
          }
          break;
        }
        case 'doesNotContain': {
          if (isWildcard) {
            where[id] = `arrayExists(x -> ${value
              .map(
                (val) =>
                  `x NOT LIKE ${sqlstring.escape(`%${String(val).trim()}%`)}`,
              )
              .join(' OR ')}, ${whereFrom})`;
          } else {
            where[id] = `(${value
              .map(
                (val) =>
                  `${whereFrom} NOT LIKE ${sqlstring.escape(`%${String(val).trim()}%`)}`,
              )
              .join(' OR ')})`;
          }
          break;
        }
        case 'startsWith': {
          if (isWildcard) {
            where[id] = `arrayExists(x -> ${value
              .map(
                (val) => `x LIKE ${sqlstring.escape(`${String(val).trim()}%`)}`,
              )
              .join(' OR ')}, ${whereFrom})`;
          } else {
            where[id] = `(${value
              .map(
                (val) =>
                  `${whereFrom} LIKE ${sqlstring.escape(`${String(val).trim()}%`)}`,
              )
              .join(' OR ')})`;
          }
          break;
        }
        case 'endsWith': {
          if (isWildcard) {
            where[id] = `arrayExists(x -> ${value
              .map(
                (val) => `x LIKE ${sqlstring.escape(`%${String(val).trim()}`)}`,
              )
              .join(' OR ')}, ${whereFrom})`;
          } else {
            where[id] = `(${value
              .map(
                (val) =>
                  `${whereFrom} LIKE ${sqlstring.escape(`%${String(val).trim()}`)}`,
              )
              .join(' OR ')})`;
          }
          break;
        }
        case 'regex': {
          if (isWildcard) {
            where[id] = `arrayExists(x -> ${value
              .map((val) => `match(x, ${sqlstring.escape(String(val).trim())})`)
              .join(' OR ')}, ${whereFrom})`;
          } else {
            where[id] = `(${value
              .map(
                (val) =>
                  `match(${whereFrom}, ${sqlstring.escape(String(val).trim())})`,
              )
              .join(' OR ')})`;
          }
          break;
        }
        case 'isNull': {
          if (isWildcard) {
            where[id] = `arrayExists(x -> x = '' OR x IS NULL, ${whereFrom})`;
          } else {
            where[id] = `(${whereFrom} = '' OR ${whereFrom} IS NULL)`;
          }
          break;
        }
        case 'isNotNull': {
          if (isWildcard) {
            where[id] =
              `arrayExists(x -> x != '' AND x IS NOT NULL, ${whereFrom})`;
          } else {
            where[id] = `(${whereFrom} != '' AND ${whereFrom} IS NOT NULL)`;
          }
          break;
        }
      }
    } else {
      switch (operator) {
        case 'is': {
          if (value.length === 1) {
            where[id] =
              `${name} = ${sqlstring.escape(String(value[0]).trim())}`;
          } else {
            where[id] = `${name} IN (${value
              .map((val) => sqlstring.escape(String(val).trim()))
              .join(', ')})`;
          }
          break;
        }
        case 'isNull': {
          where[id] = `(${name} = '' OR ${name} IS NULL)`;
          break;
        }
        case 'isNotNull': {
          where[id] = `(${name} != '' AND ${name} IS NOT NULL)`;
          break;
        }
        case 'isNot': {
          if (value.length === 1) {
            where[id] =
              `${name} != ${sqlstring.escape(String(value[0]).trim())}`;
          } else {
            where[id] = `${name} NOT IN (${value
              .map((val) => sqlstring.escape(String(val).trim()))
              .join(', ')})`;
          }
          break;
        }
        case 'contains': {
          where[id] = `(${value
            .map(
              (val) =>
                `${name} LIKE ${sqlstring.escape(`%${String(val).trim()}%`)}`,
            )
            .join(' OR ')})`;
          break;
        }
        case 'doesNotContain': {
          where[id] = `(${value
            .map(
              (val) =>
                `${name} NOT LIKE ${sqlstring.escape(`%${String(val).trim()}%`)}`,
            )
            .join(' OR ')})`;
          break;
        }
        case 'startsWith': {
          where[id] = `(${value
            .map(
              (val) =>
                `${name} LIKE ${sqlstring.escape(`${String(val).trim()}%`)}`,
            )
            .join(' OR ')})`;
          break;
        }
        case 'endsWith': {
          where[id] = `(${value
            .map(
              (val) =>
                `${name} LIKE ${sqlstring.escape(`%${String(val).trim()}`)}`,
            )
            .join(' OR ')})`;
          break;
        }
        case 'regex': {
          where[id] = `(${value
            .map(
              (val) =>
                `match(${name}, ${sqlstring.escape(stripLeadingAndTrailingSlashes(String(val)).trim())})`,
            )
            .join(' OR ')})`;
          break;
        }
      }
    }
  });

  return where;
}

export function getChartStartEndDate(
  {
    startDate,
    endDate,
    range,
  }: Pick<IChartInput, 'endDate' | 'startDate' | 'range'>,
  timezone: string,
) {
  const ranges = getDatesFromRange(range, timezone);

  if (startDate && endDate) {
    return { startDate: startDate, endDate: endDate };
  }

  if (!startDate && endDate) {
    return { startDate: ranges.startDate, endDate: endDate };
  }

  return ranges;
}

export function getDatesFromRange(range: IChartRange, timezone: string) {
  if (range === '30min' || range === 'lastHour') {
    const minutes = range === '30min' ? 30 : 60;
    const startDate = DateTime.now()
      .minus({ minute: minutes })
      .startOf('minute')
      .setZone(timezone)
      .toFormat('yyyy-MM-dd HH:mm:ss');
    const endDate = DateTime.now()
      .setZone(timezone)
      .endOf('minute')
      .toFormat('yyyy-MM-dd HH:mm:ss');

    return {
      startDate: startDate,
      endDate: endDate,
    };
  }

  if (range === 'today') {
    const startDate = DateTime.now()
      .setZone(timezone)
      .startOf('day')
      .toFormat('yyyy-MM-dd HH:mm:ss');
    const endDate = DateTime.now()
      .setZone(timezone)
      .endOf('day')
      .toFormat('yyyy-MM-dd HH:mm:ss');

    return {
      startDate: startDate,
      endDate: endDate,
    };
  }

  if (range === 'yesterday') {
    const startDate = DateTime.now()
      .minus({ day: 1 })
      .setZone(timezone)
      .startOf('day')
      .toFormat('yyyy-MM-dd HH:mm:ss');
    const endDate = DateTime.now()
      .minus({ day: 1 })
      .setZone(timezone)
      .endOf('day')
      .toFormat('yyyy-MM-dd HH:mm:ss');
    return {
      startDate: startDate,
      endDate: endDate,
    };
  }

  if (range === '7d') {
    const startDate = DateTime.now()
      .minus({ day: 7 })
      .setZone(timezone)
      .startOf('day')
      .toFormat('yyyy-MM-dd HH:mm:ss');
    const endDate = DateTime.now()
      .setZone(timezone)
      .endOf('day')
      .plus({ millisecond: 1 })
      .toFormat('yyyy-MM-dd HH:mm:ss');

    return {
      startDate: startDate,
      endDate: endDate,
    };
  }

  if (range === '6m') {
    const startDate = DateTime.now()
      .minus({ month: 6 })
      .setZone(timezone)
      .startOf('day')
      .toFormat('yyyy-MM-dd HH:mm:ss');
    const endDate = DateTime.now()
      .setZone(timezone)
      .endOf('day')
      .plus({ millisecond: 1 })
      .toFormat('yyyy-MM-dd HH:mm:ss');

    return {
      startDate: startDate,
      endDate: endDate,
    };
  }

  if (range === '12m') {
    const startDate = DateTime.now()
      .minus({ month: 12 })
      .setZone(timezone)
      .startOf('month')
      .toFormat('yyyy-MM-dd HH:mm:ss');
    const endDate = DateTime.now()
      .setZone(timezone)
      .endOf('month')
      .plus({ millisecond: 1 })
      .toFormat('yyyy-MM-dd HH:mm:ss');

    return {
      startDate: startDate,
      endDate: endDate,
    };
  }

  if (range === 'monthToDate') {
    const startDate = DateTime.now()
      .setZone(timezone)
      .startOf('month')
      .toFormat('yyyy-MM-dd HH:mm:ss');
    const endDate = DateTime.now()
      .setZone(timezone)
      .endOf('day')
      .plus({ millisecond: 1 })
      .toFormat('yyyy-MM-dd HH:mm:ss');

    return {
      startDate: startDate,
      endDate: endDate,
    };
  }

  if (range === 'lastMonth') {
    const month = DateTime.now()
      .minus({ month: 1 })
      .setZone(timezone)
      .startOf('month');

    const startDate = month.toFormat('yyyy-MM-dd HH:mm:ss');
    const endDate = month
      .endOf('month')
      .plus({ millisecond: 1 })
      .toFormat('yyyy-MM-dd HH:mm:ss');

    return {
      startDate: startDate,
      endDate: endDate,
    };
  }

  if (range === 'yearToDate') {
    const startDate = DateTime.now()
      .setZone(timezone)
      .startOf('year')
      .toFormat('yyyy-MM-dd HH:mm:ss');
    const endDate = DateTime.now()
      .setZone(timezone)
      .endOf('day')
      .plus({ millisecond: 1 })
      .toFormat('yyyy-MM-dd HH:mm:ss');

    return {
      startDate: startDate,
      endDate: endDate,
    };
  }

  if (range === 'lastYear') {
    const year = DateTime.now().minus({ year: 1 }).setZone(timezone);
    const startDate = year.startOf('year').toFormat('yyyy-MM-dd HH:mm:ss');
    const endDate = year.endOf('year').toFormat('yyyy-MM-dd HH:mm:ss');

    return {
      startDate: startDate,
      endDate: endDate,
    };
  }

  // range === '30d'
  const startDate = DateTime.now()
    .minus({ day: 30 })
    .setZone(timezone)
    .startOf('day')
    .toFormat('yyyy-MM-dd HH:mm:ss');
  const endDate = DateTime.now()
    .setZone(timezone)
    .endOf('day')
    .plus({ millisecond: 1 })
    .toFormat('yyyy-MM-dd HH:mm:ss');

  return {
    startDate: startDate,
    endDate: endDate,
  };
}

export function getChartPrevStartEndDate({
  startDate,
  endDate,
}: {
  startDate: string;
  endDate: string;
}) {
  let diff = DateTime.fromFormat(endDate, 'yyyy-MM-dd HH:mm:ss').diff(
    DateTime.fromFormat(startDate, 'yyyy-MM-dd HH:mm:ss'),
  );

  // this will make sure our start and end date's are correct
  // otherwise if a day ends with 23:59:59.999 and starts with 00:00:00.000
  // the diff will be 23:59:59.999 and that will make the start date wrong
  // so we add 1 millisecond to the diff
  if ((diff.milliseconds / 1000) % 2 !== 0) {
    diff = diff.plus({ millisecond: 1 });
  }

  return {
    startDate: DateTime.fromFormat(startDate, 'yyyy-MM-dd HH:mm:ss')
      .minus({ millisecond: diff.milliseconds })
      .toFormat('yyyy-MM-dd HH:mm:ss'),
    endDate: DateTime.fromFormat(endDate, 'yyyy-MM-dd HH:mm:ss')
      .minus({ millisecond: diff.milliseconds })
      .toFormat('yyyy-MM-dd HH:mm:ss'),
  };
}