import { type MemoryScope, MemoryStore } from "../memory/store.js";
import {
  setRuntimeSessionContext,
  type RuntimeSessionContext,
} from "../runtime/sessionContext.js";
import { SkillStore } from "../skills/store.js";

export type MemoryManagerInput = {
  action: "add" | "list" | "replace" | "remove";
  content?: string;
  scope: string;
  target_id?: string;
};

export type SkillManagerInput = {
  action:
    | "list"
    | "write_skill"
    | "remove_skill"
    | "append_pattern"
    | "remove_pattern"
    | "write_reference"
    | "remove_reference"
    | "write_script"
    | "remove_script";
  content?: string;
  file_path?: string;
  pattern?: string;
  skill_path: string;
  target_id?: string;
};

export const executeMemoryManager = async (
  memoryStore: MemoryStore,
  sessionContext: RuntimeSessionContext,
  input: MemoryManagerInput,
) => {
  const scope: MemoryScope | null =
    input.scope === "user"
      ? "user"
      : input.scope === "workspace"
        ? "workspace"
        : null;
  if (!scope) {
    return rejected(
      "memory",
      `unsupported scope: ${input.scope}; use exact keyword 'user' or 'workspace'`,
    );
  }
  if (sessionContext.allowLearningWrite === false && input.action !== "list") {
    return rejected("memory", "memory writes are disabled for this session");
  }

  const scopeKey =
    scope === "user" ? sessionContext.actorKey : sessionContext.projectKey;
  if (input.action === "list") {
    setRuntimeSessionContext({
      ...sessionContext,
      memoryListReadScopes: {
        ...(sessionContext.memoryListReadScopes ?? {}),
        [scope]: true,
      },
    });
    return {
      ok: true,
      kind: "memory",
      decision: "accepted",
      detail: "memory listed",
      items: await memoryStore.list(scope, scopeKey),
      target: scope,
    };
  }

  if (input.action === "add") {
    if (sessionContext.memoryListReadScopes?.[scope] !== true) {
      return {
        ...rejected(
          "memory",
          `must list ${scope} memory and review existing entries before add`,
        ),
        target: scope,
      };
    }
    const result = await memoryStore.upsert(scope, scopeKey, {
      content: input.content ?? "",
      sessionId: sessionContext.clientSessionId,
      source: "tool",
      traceId: sessionContext.traceId,
    });
    if (!result.entry) {
      return rejected("memory", "content rejected by persistence policy");
    }
    return {
      ok: true,
      kind: "memory",
      decision: result.changed ? "accepted" : "deduped",
      detail: result.detail,
      entry: result.entry,
      target: scope,
    };
  }

  const result =
    input.action === "replace"
      ? await memoryStore.replace(scope, scopeKey, input.target_id ?? "", {
          content: input.content ?? "",
          sessionId: sessionContext.clientSessionId,
          source: "tool",
          traceId: sessionContext.traceId,
        })
      : await memoryStore.remove(scope, scopeKey, input.target_id ?? "");
  return {
    ok: true,
    kind: "memory",
    decision: result.changed ? "accepted" : "rejected",
    detail: result.detail,
    target: scope,
  };
};

export const executeSkillManager = async (
  skillStore: SkillStore,
  sessionContext: RuntimeSessionContext,
  input: SkillManagerInput,
) => {
  if (sessionContext.allowLearningWrite === false && input.action !== "list") {
    return rejected("skill", "skill writes are disabled for this session");
  }
  if (input.action === "list") {
    const result = await skillStore.list(input.skill_path);
    if (!result) {
      return rejected(
        "skill",
        "invalid skill_path; expected a relative path under .opencode/skills",
      );
    }
    return {
      ok: true,
      kind: "skill",
      decision: "accepted",
      detail: "skill listed",
      references: result.references,
      scripts: result.scripts,
      skill_path: result.skillPath,
      target: result.target,
      patterns: result.patterns,
    };
  }

  const result =
    input.action === "write_skill"
      ? await skillStore.writeSkill(input.skill_path, input.content ?? "")
      : input.action === "remove_skill"
        ? await skillStore.removeSkill(input.skill_path)
        : input.action === "append_pattern"
          ? await skillStore.appendPattern(input.skill_path, input.pattern ?? "")
          : input.action === "remove_pattern"
            ? await skillStore.removePattern(input.skill_path, input.target_id ?? "")
            : input.action === "write_reference"
              ? await skillStore.writeReference(
                  input.skill_path,
                  input.file_path ?? "",
                  input.content ?? "",
                )
              : input.action === "remove_reference"
                ? await skillStore.removeReference(
                    input.skill_path,
                    input.file_path ?? "",
                  )
                : input.action === "write_script"
                  ? await skillStore.writeScript(
                      input.skill_path,
                      input.file_path ?? "",
                      input.content ?? "",
                    )
                  : await skillStore.removeScript(
                      input.skill_path,
                      input.file_path ?? "",
                    );
  return {
    ok: true,
    kind: "skill",
    decision: result.changed ? "accepted" : "rejected",
    detail: result.detail,
    target: result.target,
  };
};

const rejected = (kind: "memory" | "skill", detail: string) => ({
  ok: true,
  kind,
  decision: "rejected",
  detail,
});