import { z } from "zod/v4";

// Make sure to update the InMemoryFilterService if you add new filter types
export const filterOperators = {
  datetime: [">", "<", ">=", "<="],
  string: ["=", "contains", "does not contain", "starts with", "ends with"],
  stringOptions: ["any of", "none of"],
  categoryOptions: ["any of", "none of"],
  arrayOptions: ["any of", "none of", "all of"],
  number: ["=", ">", "<", ">=", "<="],
  stringObject: [
    "=",
    "contains",
    "does not contain",
    "starts with",
    "ends with",
  ],
  numberObject: ["=", ">", "<", ">=", "<="],
  boolean: ["=", "<>"],
  null: ["is null", "is not null"],
} as const;

export const timeFilter = z.object({
  column: z.string(),
  operator: z.enum(filterOperators.datetime),
  value: z.coerce.date(), // coerce required to parse stringified dates from the db in evals
  type: z.literal("datetime"),
});
export const stringFilter = z.object({
  column: z.string(),
  operator: z.enum(filterOperators.string),
  value: z.string(),
  type: z.literal("string"),
});
export const numberFilter = z.object({
  column: z.string(),
  operator: z.enum(filterOperators.number),
  value: z.number(),
  type: z.literal("number"),
});
export const stringOptionsFilter = z.object({
  column: z.string(),
  operator: z.enum(filterOperators.stringOptions),
  // do not filter on empty arrays, use refine to check this only at runtime (no type checking)
  value: z.array(z.string()).refine((v) => v.length > 0),
  type: z.literal("stringOptions"),
});
export const arrayOptionsFilter = z.object({
  column: z.string(),
  operator: z.enum(filterOperators.arrayOptions),
  value: z.array(z.string()).refine((v) => v.length > 0),
  type: z.literal("arrayOptions"),
});
export const stringObjectFilter = z.object({
  type: z.literal("stringObject"),
  column: z.string(),
  key: z.string(), // eg metadata --> "environment"
  operator: z.enum(filterOperators.string),
  value: z.string(),
});
export const numberObjectFilter = z.object({
  type: z.literal("numberObject"),
  column: z.string(),
  key: z.string(), // eg scores --> "accuracy"
  operator: z.enum(filterOperators.number),
  value: z.number(),
});
export const booleanFilter = z.object({
  type: z.literal("boolean"),
  column: z.string(),
  operator: z.enum(filterOperators.boolean),
  value: z.boolean(),
});
export const nullFilter = z.object({
  type: z.literal("null"),
  column: z.string(),
  operator: z.enum(filterOperators.null),
  value: z.literal(""),
});
export const categoryOptionsFilter = z.object({
  type: z.literal("categoryOptions"),
  column: z.string(),
  key: z.string(),
  operator: z.enum(filterOperators.categoryOptions),
  value: z.array(z.string()),
});
export const singleFilter = z.discriminatedUnion("type", [
  timeFilter,
  stringFilter,
  numberFilter,
  stringOptionsFilter,
  categoryOptionsFilter,
  arrayOptionsFilter,
  stringObjectFilter,
  numberObjectFilter,
  booleanFilter,
  nullFilter,
]);