import { createPrismaSchemaBuilder } from "@mrleebo/prisma-ast";
import { readAsync } from "fs-jetpack";
import { Prisma } from "../../app/db/db";
import { dir } from "./dir";

export type DBArg = {
  db: string;
  table: string;
  action: string;
  params: any[];
};

export const execQuery = async (args: DBArg, prisma: any) => {
  const { table, action, params } = args;

  if (action.startsWith("schema_")) {
    const schema_path = dir("app/db/prisma/schema.prisma");
    const schema = createPrismaSchemaBuilder(await readAsync(schema_path));
    if (action === "schema_tables") {
      const tables = schema.findAllByType("model", {}).map((e) => e?.name);
      return tables || [];
    } else {
      const schema_table = schema.findByType("model", { name: table });
      const columns = {} as Record<
        string,
        {
          is_pk: boolean;
          type: string;
          optional: boolean;
          db_type: string;
          default?: any
        }
      >;
      const rels = {} as Record<string, {
        type: 'has-many',
        to: { table: string, fields: string[] }
        from: { table: string, fields: string[] }
      } | {
        type: 'has-one',
        to: { table: string, fields: string[] }
        from: { table: string, fields: string[] }
      }>
      if (schema_table) {
        if (action === "schema_rels") {
          for (const col of schema_table.properties) {
            if (
              col.type === "field" &&
              (!!col.array ||
                col.attributes &&
                col.attributes?.length > 0)
            ) {
              if (col.array) {
                if (typeof col.fieldType === 'string') {
                  const target = schema.findByType('model', { name: col.fieldType })

                  if (target) {
                    const field = target.properties.find(e => {
                      if (e.type === 'field'
                        && e.fieldType === table) {
                        return true;
                      }
                    });
                    if (field && field.type === 'field') {
                      const rel = field.attributes?.find(e => e.kind === 'field');

                      if (rel && rel.args) {
                        const { field, ref } = getFieldAndRef(rel, target, table);

                        if (target && ref) {
                          rels[col.name] = {
                            type: 'has-many',
                            to: field,
                            from: ref
                          }
                        }

                      }
                    }
                  }
                }
              } else if (col.attributes) {
                const rel = col.attributes.find(e => e.type === 'attribute' && e.name === 'relation');
                if (rel && typeof col.fieldType === 'string') {
                  const target = schema.findByType('model', { name: col.fieldType });
                  const { field, ref } = getFieldAndRef(rel, target, table);

                  rels[col.name] = {
                    type: 'has-one',
                    to: {
                      table: field.table,
                      fields: ref.fields
                    },
                    from: {
                      table: ref.table,
                      fields: field.fields
                    }
                  }
                }
              }
            }
          }
          return rels;
        } else if (action === "schema_columns") {
          for (const col of schema_table.properties) {
            if (
              col.type === "field" &&
              !col.array &&
              col.attributes &&
              col.attributes?.length > 0
            ) {
              const attr = col.attributes.find(e => e.name !== 'id' && e.name !== 'default');

              const default_val = col.attributes.find(e => e.name === 'default');
              const is_pk = col.attributes.find(e => e.name === 'id');

              if (attr && attr.name !== "relation") {
                let type = "String";
                if (typeof col.fieldType === "string") type = col.fieldType;

                columns[col.name] = {
                  is_pk: !!is_pk,
                  type: type.toLowerCase(),
                  optional: !!col.optional,
                  db_type: attr.name,
                  default: default_val
                };
              }
            }
          }
          return columns;
        }
      }
    }
  }

  const tableInstance = prisma[table];

  if (tableInstance) {
    if (action === "query" && table.startsWith("$query")) {
      try {
        const q = params.shift();
        return await tableInstance.bind(prisma)(Prisma.sql(q, ...params));
      } catch (e) {
        console.log(e);
        return e;
      }
    }

    const method = tableInstance[action];

    if (method) {
      try {
        const result = await method(...params);

        if (!result) {
          return JSON.stringify(result);
        }

        return result;
      } catch (e: any) {
        throw new Error(e.message);
      }
    }
  }
};

const getFieldAndRef = (rel: any, target: any, table: string) => {
  let field = null as unknown as { table: string, fields: string[] };
  let ref = null as unknown as { table: string, fields: string[] };
  for (const e of rel.args) {
    if (typeof e.value === 'object'
      && !Array.isArray(e.value)
      && e.value.type === 'keyValue'
      && typeof e.value.value === 'object'
      && !Array.isArray(e.value.value)
      && e.value.value.type === 'array') {
      if (e.value.key === 'fields') {
        field = {
          table: target.name,
          fields: e.value.value.args
        }
      } else if (e.value.key === 'references') {
        ref = {
          table: table,
          fields: e.value.value.args
        }
      }
    }
  }
  return { field, ref };
}