import {
  AgenticaExecuteHistory,
  IMicroAgenticaHistoryJson,
} from "@agentica/core";
import {
  AutoBeEventSource,
  AutoBeFunctionCallingMetric,
  AutoBePreliminaryAcquisition,
  AutoBePreliminaryKind,
  AutoBePreliminaryRewriteEvent,
  AutoBeProcessAggregate,
  IAutoBeTokenUsageJson,
} from "@autobe/interface";
import {
  AutoBeFunctionCallingMetricFactory,
  AutoBeProcessAggregateFactory,
  TokenUsageComputer,
} from "@autobe/utils";
import {
  IJsonSchemaApplication,
  ILlmApplication,
  IValidation,
} from "@typia/interface";
import { OpenApiTypeChecker } from "@typia/utils";
import { IPointer } from "tstl";
import { v7 } from "uuid";

import { AutoBeConfigConstant } from "../../constants/AutoBeConfigConstant";
import { AutoBeContext } from "../../context/AutoBeContext";
import { AutoBeState } from "../../context/AutoBeState";
import { AutoBePreliminaryExhaustedError } from "../../utils/AutoBePreliminaryExhaustedError";
import { transformPreliminaryHistory } from "./histories/transformPreliminaryHistory";
import { complementPreliminaryCollection } from "./internal/complementPreliminaryCollection";
import { createPreliminaryCollection } from "./internal/createPreliminaryCollection";
import { fixPreliminaryApplication } from "./internal/fixPrelminaryApplication";
import { validatePreliminary } from "./internal/validatePreliminary";
import { orchestratePreliminary } from "./orchestratePreliminary";
import { IAutoBePreliminaryRequest } from "./structures/AutoBePreliminaryRequest";
import { IAutoBeOrchestrateResult } from "./structures/IAutoBeOrchestrateResult";
import { IAutoBePreliminaryCollection } from "./structures/IAutoBePreliminaryCollection";

/**
 * RAG controller for incremental context loading.
 *
 * Manages LLM's incremental data requests via function calling, preventing
 * duplicates and auto-resolving dependencies.
 *
 * - `all`: globally available data (from state)
 * - `local`: currently loaded data (agent context)
 * - Auto-complements prerequisites, $ref dependencies, and neighbors
 *
 * @author Samchon
 */
export class AutoBePreliminaryController<Kind extends AutoBePreliminaryKind> {
  // METADATA
  private readonly source: Exclude<
    AutoBeEventSource,
    "facade" | "preliminaryAcquire"
  >;
  private readonly source_id: string;
  private readonly kinds: Kind[];
  private readonly argumentTypeNames: string[];
  private readonly dispatch: (event: AutoBePreliminaryRewriteEvent) => void;

  // PRELIMINARY DATA
  private readonly all: Pick<IAutoBePreliminaryCollection, Kind>;
  private readonly local: Pick<IAutoBePreliminaryCollection, Kind>;
  private readonly config: AutoBePreliminaryController.IConfig<Kind>;
  private readonly state: AutoBeState;

  // PAGINATION
  private analysisPageOffset: number = 0;

  // COMPLETION TRACKING
  private previousWrites: IPreviousWrite[] = [];
  private completed: IPointer<boolean> = {
    value: false,
  };

  /**
   * Initializes controller with data collections and auto-complements
   * dependencies.
   *
   * @param props Constructor configuration including kinds, state, and initial
   *   data.
   */
  public constructor(props: AutoBePreliminaryController.IProps<Kind>) {
    this.source = props.source;
    this.source_id = v7();
    this.kinds = props.kinds;
    this.dispatch = props.dispatch;

    // biome-ignore-start lint: intended
    this.config = {
      database: props.config?.database ?? "text",
      databaseProperty: props.config?.databaseProperty ?? false,
    } satisfies AutoBePreliminaryController.IConfig<any> as AutoBePreliminaryController.IConfig<any>;
    // biome-ignore-end lint: intended

    this.argumentTypeNames = (() => {
      const func = props.application.functions.find(
        (f) => f.name === "process",
      );
      if (func === undefined)
        throw new Error("Unable to find 'process' function in application.");

      const param = func.parameters[0]?.schema;
      if (
        param === undefined ||
        OpenApiTypeChecker.isReference(param) === false
      )
        throw new Error(
          "'process' function parameter is not a reference type.",
        );
      const schema =
        props.application.components.schemas?.[param.$ref.split("/").pop()!];
      if (schema === undefined || OpenApiTypeChecker.isObject(schema) === false)
        throw new Error(
          "'process' function parameter reference is not an object type.",
        );
      const request = schema.properties?.request;
      if (
        request === undefined ||
        OpenApiTypeChecker.isOneOf(request) === false
      )
        throw new Error(
          "'process' function parameter.request is not a oneOf type.",
        );
      else if (
        request.oneOf.length === 0 ||
        request.oneOf.every(
          (sch) => OpenApiTypeChecker.isReference(sch) === false,
        )
      )
        throw new Error(
          "'process' function parameter.request oneOf does not contain any reference type.",
        );
      return request.oneOf.map((sch) => {
        // biome-ignore lint: intended
        const ref = (sch as any).$ref;
        return ref.split("/").pop()!;
      });
    })();

    this.state = props.state;
    this.all = createPreliminaryCollection(props.state, props.all);
    this.local = createPreliminaryCollection(null, props.local);

    complementPreliminaryCollection({
      kinds: props.kinds,
      all: this.all as IAutoBePreliminaryCollection,
      local: this.local as IAutoBePreliminaryCollection,
      prerequisite: false,
    });
  }

  /**
   * Validates request for duplicates and non-existent items.
   *
   * @param input LLM's function calling request to validate.
   * @returns Validation result with errors if duplicates or non-existent items
   *   found.
   */
  public validate(
    input: IAutoBePreliminaryRequest<Kind>,
  ): IValidation<IAutoBePreliminaryRequest<Kind>> {
    return validatePreliminary(this, input);
  }

  /**
   * Generates dynamic system prompts with `LOADED`/`AVAILABLE` lists.
   *
   * @returns Assistant and system messages with loaded/available item lists.
   */
  public getHistories(): IMicroAgenticaHistoryJson[] {
    return transformPreliminaryHistory(this);
  }

  /**
   * Returns the orchestration source that created this controller.
   *
   * @returns Source event type (e.g., `"realizeWrite"`, `"interfaceSchema"`).
   */
  public getSource(): Exclude<
    AutoBeEventSource,
    "facade" | "preliminaryAcquire"
  > {
    return this.source;
  }

  /**
   * Returns data types enabled for this controller.
   *
   * @returns Array of enabled kinds (e.g., `["databaseSchemas",
   *   "interfaceSchemas"]`).
   */
  public getKinds(): Kind[] {
    return this.kinds;
  }

  /**
   * Returns configuration (e.g., database schema format: `"ast"` | `"text"`).
   *
   * @returns Controller configuration object.
   */
  public getConfig(): AutoBePreliminaryController.IConfig<Kind> {
    return this.config;
  }

  /**
   * Returns function calling type names available in LLM application.
   *
   * @returns Array of request type names from `oneOf` union.
   */
  public getArgumentTypeNames(): string[] {
    return this.argumentTypeNames;
  }

  /**
   * Returns all globally available data from state.
   *
   * @returns Complete dataset that can be requested.
   */
  public getAll(): Pick<IAutoBePreliminaryCollection, Kind> {
    return this.all;
  }

  /**
   * Returns currently loaded data in agent context.
   *
   * @returns Subset of data already provided to LLM.
   */
  public getLocal(): Pick<IAutoBePreliminaryCollection, Kind> {
    return this.local;
  }

  /**
   * Extracts acquisition metadata from the currently loaded preliminary data.
   *
   * Transforms the local preliminary collection into a normalized acquisition
   * structure that is suitable for event tracking, including only metadata such
   * as filenames, schema names, and operation identifiers rather than full
   * objects.
   *
   * @returns Acquisition metadata derived from currently loaded data,
   *   normalized for event tracking.
   */
  public getAcquisition(): Pick<AutoBePreliminaryAcquisition, Kind> {
    const acquisition: Partial<AutoBePreliminaryAcquisition> = {};
    const local: IAutoBePreliminaryCollection = this
      .local as IAutoBePreliminaryCollection;
    for (const kind of this.kinds)
      if (kind === "analysisSections")
        acquisition.analysisSections = local.analysisSections.map((s) => s.id);
      else if (kind === "databaseSchemas")
        acquisition.databaseSchemas = local.databaseSchemas.map((s) => s.name);
      else if (kind === "interfaceOperations")
        acquisition.interfaceOperations = local.interfaceOperations.map(
          (o) => ({
            path: o.path,
            method: o.method,
          }),
        );
      else if (kind === "interfaceSchemas")
        acquisition.interfaceSchemas = Object.keys(local.interfaceSchemas);
      else if (kind === "realizeCollectors")
        acquisition.realizeCollectors = local.realizeCollectors.map(
          (f) => f.plan.dtoTypeName,
        );
      else if (kind === "realizeTransformers")
        acquisition.realizeTransformers = local.realizeTransformers.map(
          (f) => f.plan.dtoTypeName,
        );
      else if (kind === "previousAnalysisSections")
        acquisition.previousAnalysisSections =
          local.previousAnalysisSections.map((s) => s.id);
      else if (kind === "previousDatabaseSchemas")
        acquisition.previousDatabaseSchemas = local.previousDatabaseSchemas.map(
          (s) => s.name,
        );
      else if (kind === "previousInterfaceOperations")
        acquisition.previousInterfaceOperations =
          local.previousInterfaceOperations.map((o) => ({
            path: o.path,
            method: o.method,
          }));
      else if (kind === "previousInterfaceSchemas")
        acquisition.previousInterfaceSchemas = Object.keys(
          local.previousInterfaceSchemas,
        );
      else if (kind === "complete") acquisition.complete = false;
      else kind satisfies never;
    return acquisition as Pick<AutoBePreliminaryAcquisition, Kind>;
  }

  /**
   * Returns the current AutoBe state.
   *
   * @returns Current pipeline state containing all phase histories.
   */
  public getState(): AutoBeState {
    return this.state;
  }

  /** Returns current page offset for analysis section metadata pagination. */
  public getAnalysisPageOffset(): number {
    return this.analysisPageOffset;
  }

  public getPreviousWrite(): Record<string, unknown> | null {
    return this.previousWrites.at(-1)?.raw ?? null;
  }

  /** Advances analysis section metadata page by PAGE_SIZE. */
  public advanceAnalysisPage(): void {
    this.analysisPageOffset += AutoBeConfigConstant.ANALYSIS_PAGE_SIZE;
  }

  /**
   * Dynamically adjusts LLM application schema at runtime.
   *
   * Removes `getPreviousXXX` types from union/oneOf when no previous iteration
   * exists. Mutates application's `anyOf`/`oneOf` array, `$defs`, and
   * `discriminator` mapping. Also erases corresponding `kinds` from
   * controller's `all`/`local` collections.
   *
   * @param application LLM application to modify (mutated in-place)
   */
  public fixApplication(
    application: ILlmApplication,
    enumerable: boolean = false,
  ): ILlmApplication {
    fixPreliminaryApplication({
      state: this.state,
      preliminary: this,
      application,
      enumerable,
    });
    return application;
  }

  /**
   * Runs RAG loop for incremental context loading.
   *
   * Repeats until process returns non-null value or exceeds the maximum number
   * of iterations (`AutoBeConfigConstant.RAG_LIMIT`). Each iteration: LLM
   * requests data → `orchestratePreliminary` adds to `local` → next iteration
   * with updated context.
   *
   * When RAG_LIMIT is exhausted, throws `AutoBePreliminaryExhaustedError` which
   * can be caught alongside `AutoBeTimeoutError` for force-pass.
   *
   * @param ctx AutoBe context for `conversate` and state access.
   * @param process Callback that runs LLM `conversate` and returns result.
   * @returns Final value when process returns non-null or throws after
   *   exceeding `AutoBeConfigConstant.RAG_LIMIT` retries.
   */
  public async orchestrate<T>(
    ctx: AutoBeContext,
    process: (
      out: (
        result: AutoBeContext.IResult,
      ) => (value: T | null) => IAutoBeOrchestrateResult<T>,
    ) => Promise<IAutoBeOrchestrateResult<T>>,
  ): Promise<T | never> {
    // initialize
    this.previousWrites = [];
    this.completed.value = false satisfies boolean as boolean;
    const aggregate: AutoBeProcessAggregate =
      AutoBeProcessAggregateFactory.createAggregate();

    try {
      for (let i: number = 0; i < AutoBeConfigConstant.RAG_LIMIT; ++i) {
        // take a process
        const result: IAutoBeOrchestrateResult<T> = await process(
          (x) => (value) => ({
            ...x,
            value,
          }),
        );

        // swap consumption to aggregate
        AutoBeFunctionCallingMetricFactory.increment(
          aggregate.metric,
          result.metric,
        );
        TokenUsageComputer.increment(aggregate.tokenUsage, result.tokenUsage);
        result.tokenUsage = aggregate.tokenUsage;
        result.metric = aggregate.metric;

        if (result.value !== null) {
          const executes: AgenticaExecuteHistory[] = result.histories.filter(
            (h) => h.type === "execute",
          );
          const history: AgenticaExecuteHistory | undefined = executes.find(
            (h) => (h.arguments.request as { type: "write" }).type === "write",
          );
          if (history === undefined) continue;

          // store write result and raw arguments
          this.previousWrites.push({
            value: result.value as T,
            metric: result.metric,
            tokenUsage: result.tokenUsage,
            raw: history.arguments,
          });
          if (this.previousWrites.length > 1) {
            this.dispatch({
              id: v7(),
              type: "preliminaryRewrite",
              source: this.source,
              thinking: history.arguments.thinking as string,
              oldbie: this.previousWrites.at(-2)!.raw,
              newbie: history.arguments,
              created_at: new Date().toISOString(),
            } satisfies AutoBePreliminaryRewriteEvent);
          }
          if (
            this.previousWrites.length >=
            (this.kinds.includes("complete" as Kind)
              ? AutoBeConfigConstant.PRELIMINARY_WRITE_LIMIT
              : 1)
          )
            break;
        } else {
          // orchestrate next iteration
          await orchestratePreliminary(ctx, {
            source_id: this.source_id,
            source: this.source,
            preliminary: this,
            trial: i + 1,
            histories: result.histories,
            completed: this.completed,
          });
          if (this.completed.value === true && this.previousWrites.length !== 0)
            break;
        }
      }
    } catch (error) {
      if (this.previousWrites.length === 0) throw error;
    }

    // check success
    const last: IPreviousWrite | undefined = this.previousWrites.at(-1);
    if (last !== undefined) return last.value as T;

    throw new AutoBePreliminaryExhaustedError();
  }
}
export namespace AutoBePreliminaryController {
  /** Constructor props for `AutoBePreliminaryController`. */
  export interface IProps<Kind extends AutoBePreliminaryKind> {
    /** Orchestration source creating this controller. */
    source: Exclude<AutoBeEventSource, "facade" | "preliminaryAcquire">;

    /** LLM application schema for function calling validation. */
    application: IJsonSchemaApplication;

    dispatch: (event: AutoBePreliminaryRewriteEvent) => void;

    /**
     * Data types to enable (e.g., `["databaseSchemas",
     * "interfaceOperations"]`).
     */
    kinds: Kind[];

    /** Current AutoBe state containing generated artifacts. */
    state: AutoBeState;

    /** Override globally available data (defaults to state). */
    all?: Partial<Pick<IAutoBePreliminaryCollection, Kind>>;

    /** Initial loaded data for agent context. */
    local?: Partial<Pick<IAutoBePreliminaryCollection, Kind>>;

    /** Controller configuration options. */
    config?: Partial<IConfig<Kind>>;
  }

  /** Result from orchestration process callback. */
  export interface IProcessResult<T> {
    /** Returned value if task completed, `undefined` if needs more context. */
    value: T | undefined;

    /** Conversation histories including function calling. */
    histories: IMicroAgenticaHistoryJson[];
  }

  /** Controller configuration options. */
  export interface IConfig<Kind extends AutoBePreliminaryKind> {
    /** Database schema format: `"ast"` (JSON) or `"text"` (Database DSL). */
    database: Kind extends "databaseSchemas" | "previousDatabaseSchemas"
      ? "ast" | "text"
      : never;
    databaseProperty: boolean;
  }
}

interface IPreviousWrite {
  value: unknown;
  metric: AutoBeFunctionCallingMetric;
  tokenUsage: IAutoBeTokenUsageJson.IComponent;
  raw: Record<string, unknown>;
}