import { ARRAY_FIELDS, GROUP_BY_MAP, PRIORITY_MAP } from "./constants";
import { SPECIAL_ORDER_BY } from "./query-constructor";
import { issueSchema } from "./schemas";
import { wrapDateTime } from "./utils";

export const translateQueryParams = (queries: any) => {
  const {
    group_by,
    layout,
    sub_group_by,
    labels,
    assignees,
    state,
    cycle,
    module,
    priority,
    type,
    issue_type,
    ...otherProps
  } = queries;

  const order_by = queries.order_by;
  if (state) otherProps.state_id = state;
  if (cycle) otherProps.cycle_id = cycle;
  if (module) otherProps.module_ids = module;
  if (labels) otherProps.label_ids = labels;
  if (assignees) otherProps.assignee_ids = assignees;
  if (group_by) otherProps.group_by = GROUP_BY_MAP[group_by as keyof typeof GROUP_BY_MAP];
  if (sub_group_by) otherProps.sub_group_by = GROUP_BY_MAP[sub_group_by as keyof typeof GROUP_BY_MAP];
  if (priority) {
    otherProps.priority_proxy = priority
      .split(",")
      .map((priority: string) => PRIORITY_MAP[priority as keyof typeof PRIORITY_MAP])
      .join(",");
  }
  if (type) {
    otherProps.state_group = type === "backlog" ? "backlog" : "unstarted,started";
  }
  if (issue_type) {
    otherProps.type_id = issue_type;
  }

  if (order_by?.includes("priority")) {
    otherProps.order_by = order_by.replace("priority", "priority_proxy");
  }

  // Fix invalid orderby when switching from spreadsheet layout
  if (layout !== "spreadsheet" && Object.keys(SPECIAL_ORDER_BY).includes(order_by)) {
    otherProps.order_by = "sort_order";
  }
  // For each property value, replace None with empty string
  Object.keys(otherProps).forEach((key) => {
    if (otherProps[key] === "None") {
      otherProps[key] = "";
    }
  });

  return otherProps;
};

export const getOrderByFragment = (order_by: string, table = "") => {
  let orderByString = "";
  if (!order_by) return orderByString;

  if (order_by.startsWith("-")) {
    orderByString += ` ORDER BY ${wrapDateTime(order_by.slice(1))} DESC NULLS LAST, ${table}sequence_id DESC`;
  } else {
    orderByString += ` ORDER BY ${wrapDateTime(order_by)} ASC NULLS LAST, ${table}sequence_id DESC`;
  }
  return orderByString;
};

export const isMetaJoinRequired = (groupBy: string, subGroupBy: string) =>
  ARRAY_FIELDS.includes(groupBy) || ARRAY_FIELDS.includes(subGroupBy);

export const getMetaKeysFragment = (queries: any) => {
  const { group_by, sub_group_by, ...otherProps } = translateQueryParams(queries);

  const fields: Set<string> = new Set();
  if (ARRAY_FIELDS.includes(group_by)) {
    fields.add(group_by);
  }

  if (ARRAY_FIELDS.includes(sub_group_by)) {
    fields.add(sub_group_by);
  }

  const keys = Object.keys(otherProps);

  keys.forEach((field: string) => {
    if (ARRAY_FIELDS.includes(field)) {
      fields.add(field);
    }
  });

  const sql = `  ('${Array.from(fields).join("','")}')`;

  return sql;
};

export const getMetaKeys = (queries: any): string[] => {
  const { group_by, sub_group_by, ...otherProps } = translateQueryParams(queries);

  const fields: Set<string> = new Set();
  if (ARRAY_FIELDS.includes(group_by)) {
    fields.add(group_by);
  }

  if (ARRAY_FIELDS.includes(sub_group_by)) {
    fields.add(sub_group_by);
  }

  const keys = Object.keys(otherProps);

  keys.forEach((field: string) => {
    if (ARRAY_FIELDS.includes(field)) {
      fields.add(field);
    }
  });

  return Array.from(fields);
};

const areJoinsRequired = (queries: any) => {
  const { group_by, sub_group_by, ...otherProps } = translateQueryParams(queries);

  if (ARRAY_FIELDS.includes(group_by) || ARRAY_FIELDS.includes(sub_group_by)) {
    return true;
  }
  if (Object.keys(otherProps).some((field) => ARRAY_FIELDS.includes(field))) {
    return true;
  }
  return false;
};

// Apply filters to the query
export const getFilteredRowsForGrouping = (projectId: string, queries: any) => {
  const { group_by, sub_group_by, ...otherProps } = translateQueryParams(queries);

  const filterJoinFields = getMetaKeys(otherProps);

  const temp = getSingleFilterFields(queries);
  const issueTableFilterFields = temp.length ? "," + temp.join(",") : "";

  const joinsRequired = areJoinsRequired(queries);

  let sql = "";
  if (!joinsRequired) {
    sql = `WITH fi as (SELECT i.id,i.created_at, i.sequence_id ${issueTableFilterFields}`;
    if (group_by) {
      if (group_by === "target_date") {
        sql += `, date(i.${group_by}) as group_id`;
      } else {
        sql += `, i.${group_by} as group_id`;
      }
    }
    if (sub_group_by) {
      sql += `, i.${sub_group_by} as sub_group_id`;
    }
    sql += ` FROM issues i `;
    if (otherProps.state_group) {
      sql += `LEFT JOIN states ON i.state_id = states.id `;
    }
    sql += `WHERE 1=1 `;
    if (projectId) {
      sql += ` AND i.project_id = '${projectId}'
      `;
    }
    sql += `${singleFilterConstructor(otherProps)}) 
    `;
    return sql;
  }

  sql = `WITH fi AS (`;
  sql += `SELECT i.id,i.created_at,i.sequence_id ${issueTableFilterFields} `;
  if (group_by) {
    if (ARRAY_FIELDS.includes(group_by)) {
      sql += `, ${group_by}.value as group_id
      `;
    } else if (group_by === "target_date") {
      sql += `, date(i.${group_by}) as group_id
      `;
    } else {
      sql += `, i.${group_by} as group_id
      `;
    }
  }
  if (sub_group_by) {
    if (ARRAY_FIELDS.includes(sub_group_by)) {
      sql += `, ${sub_group_by}.value as sub_group_id
      `;
    } else {
      sql += `, i.${sub_group_by} as sub_group_id
      `;
    }
  }

  sql += ` from issues i
  `;
  if (otherProps.state_group) {
    sql += `LEFT JOIN states ON i.state_id = states.id `;
  }
  filterJoinFields.forEach((field: string) => {
    sql += ` INNER JOIN issue_meta ${field} ON i.id = ${field}.issue_id AND ${field}.key = '${field}' AND ${field}.value  IN ('${otherProps[field].split(",").join("','")}')
    `;
  });

  // If group by field is not already joined, join it
  if (ARRAY_FIELDS.includes(group_by) && !filterJoinFields.includes(group_by)) {
    sql += ` LEFT JOIN issue_meta ${group_by} ON i.id = ${group_by}.issue_id AND ${group_by}.key = '${group_by}'
    `;
  }
  if (ARRAY_FIELDS.includes(sub_group_by) && !filterJoinFields.includes(sub_group_by)) {
    sql += ` LEFT JOIN issue_meta ${sub_group_by} ON i.id = ${sub_group_by}.issue_id AND ${sub_group_by}.key = '${sub_group_by}'
    `;
  }

  sql += ` WHERE 1=1  `;
  if (projectId) {
    sql += ` AND i.project_id = '${projectId}'
    `;
  }
  sql += singleFilterConstructor(otherProps);

  sql += `)
  `;
  return sql;
};

export const singleFilterConstructor = (queries: any) => {
  const {
    order_by,
    cursor,
    per_page,
    group_by,
    sub_group_by,
    state_group,
    sub_issue,
    target_date,
    start_date,
    ...filters
  } = translateQueryParams(queries);

  let sql = "";
  if (!sub_issue) {
    sql += ` AND parent_id IS NULL 
    `;
  }
  if (target_date) {
    sql += createDateFilter("target_date", target_date);
  }
  if (start_date) {
    sql += createDateFilter("start_date", start_date);
  }
  if (state_group) {
    sql += ` AND state_group in ('${state_group.split(",").join("','")}')
    `;
  }
  const keys = Object.keys(filters);

  keys.forEach((key) => {
    const value = filters[key] ? filters[key].split(",") : "";
    if (!ARRAY_FIELDS.includes(key)) {
      if (!value) {
        sql += ` AND ${key} IS NULL`;
        return;
      }
      sql += ` AND ${key} in ('${value.join("','")}')
      `;
    }
  });
  //

  return sql;
};

const createDateFilter = (key: string, q: string) => {
  let sql = "  ";
  // get todays date in YYYY-MM-DD format
  const queries = q.split(",");
  const customRange: string[] = [];
  let isAnd = true;
  queries.forEach((query: string) => {
    const [date, type, from] = query.split(";");
    if (from) {
      // Assuming type is always after
      let after = "";
      const [_length, unit] = date.split("_");
      const length = parseInt(_length);

      if (unit === "weeks") {
        // get date in yyyy-mm-dd format one week from now
        after = new Date(new Date().setDate(new Date().getDate() + length * 7)).toISOString().split("T")[0];
      }
      if (unit === "months") {
        after = new Date(new Date().setDate(new Date().getDate() + length * 30)).toISOString().split("T")[0];
      }
      sql += ` ${isAnd ? "AND" : "OR"} ${key} >= date('${after}')`;
      isAnd = false;
      // sql += ` AND ${key} ${type === "after" ? ">=" : "<="} date('${date}', '${today}')`;
    } else {
      customRange.push(query);
    }
  });

  if (customRange.length === 2) {
    const end = customRange.find((date) => date.includes("before"))?.split(";")[0];
    const start = customRange.find((date) => date.includes("after"))?.split(";")[0];
    if (end && start) {
      sql += ` ${isAnd ? "AND" : "OR"} ${key} BETWEEN date('${start}') AND date('${end}')`;
    }
  }
  if (customRange.length === 1) {
    sql += ` AND ${key}=date('${customRange[0].split(";")[0]}')`;
  }

  return sql;
};
const getSingleFilterFields = (queries: any) => {
  const { order_by, cursor, per_page, group_by, sub_group_by, sub_issue, state_group, ...otherProps } =
    translateQueryParams(queries);

  const fields = new Set();

  if (order_by && !order_by.includes("created_at") && !Object.keys(SPECIAL_ORDER_BY).includes(order_by))
    fields.add(order_by.replace("-", ""));

  const keys = Object.keys(otherProps);

  keys.forEach((field: string) => {
    if (!ARRAY_FIELDS.includes(field)) {
      fields.add(field);
    }
  });

  if (order_by?.includes("state__name")) {
    fields.add("state_id");
  }
  if (order_by?.includes("cycle__name")) {
    fields.add("cycle_id");
  }
  if (state_group) {
    fields.add("states.'group' as state_group");
  }
  if (order_by?.includes("estimate_point__key")) {
    fields.add("estimate_point");
  }
  return Array.from(fields);
};

export const getIssueFieldsFragment = () => {
  const { description_html, ...filtered } = issueSchema;
  const keys = Object.keys(filtered);
  const sql = `  ${keys.map((key) => `i.${key}`).join(`,
    `)}`;
  return sql;
};