import { invoke } from "@tauri-apps/api/core";
import type {
  Workspace,
  WorkspaceEntryBase,
  RequestBody,
  WorkspaceEntry,
  WorkspaceEnvironment,
  EnvVariable,
} from "./types";

export type WorkspaceState = {
  /**
   * Currently selected workspace.
   */
  workspace: Workspace | null;

  /**
   * Currently selected workspace entry.
   */
  entry: WorkspaceEntry | null;

  /**
   * Workspace root entries.
   */
  roots: number[];

  /**
   * Workspace entry parent => children mappings.
   */
  children: Record<number, number[]>;

  /**
   * All workspace entries.
   */
  indexes: Record<number, WorkspaceEntry>;

  /**
   * Currently selected workspace environments.
   */
  environments: WorkspaceEnvironment[];

  /**
   * Currently selected environment.
   */
  environment: WorkspaceEnvironment | null;
};

export const state: WorkspaceState = $state({
  workspace: null,
  entry: null,
  roots: [],
  children: {},
  indexes: {},
  environments: [],
  environment: null,
});

const index = (entry: WorkspaceEntry) => {
  console.log("indexing", entry);
  state.indexes[entry.id] = entry;

  if (entry.parent_id !== null) {
    if (state.children[entry.parent_id]) {
      state.children[entry.parent_id].push(entry.id);
    } else {
      state.children[entry.parent_id] = [entry.id];
    }
  } else {
    state.roots.push(entry.id);
  }
};

function reset() {
  state.children = {};
  state.indexes = {};
  state.roots = [];
  state.entry = null;
  state.environment = null;
  state.environments = [];
}

export function selectEnvironment(id: number | null) {
  if (id === null) {
    state.environment = null;
    return;
  }
  console.debug("selecting environment:", state.environments[id]);
  state.environment = state.environments.find((e) => e.id === id) ?? null;
}

export function selectWorkspace(ws: Workspace) {
  console.debug("selecting workspace:", ws.name);
  state.workspace = ws;
}

export function selectEntry(id: number) {
  console.log("selecting entry:", id);
  state.entry = state.indexes[id];
  if (state.entry.parent_id !== null) {
    let parent = state.indexes[state.entry.parent_id];
    while (parent) {
      parent.open = true;
      if (parent.parent_id === null) {
        break;
      }
      parent = state.indexes[parent.parent_id];
    }
  }
}

// COMMANDS

export async function createWorkspace(name: string): Promise<Workspace> {
  return invoke<Workspace>("create_workspace", { name });
}

export async function listWorkspaces(): Promise<Workspace[]> {
  return invoke<Workspace[]>("list_workspaces");
}

export async function loadWorkspace(ws: Workspace) {
  reset();

  state.workspace = ws;

  const entries = await invoke<WorkspaceEntryResponse[]>(
    "get_workspace_entries",
    {
      id: state.workspace.id,
    },
  );

  for (const entry of entries) {
    if (entry.type === "Request") {
      index({
        ...entry.data.entry,
        method: entry.data.method,
        url: entry.data.url,
        headers: entry.data.headers,
        body: entry.data.body,
      });
    } else {
      index(entry.data);
    }
  }

  await loadEnvironments(state.workspace.id);
}

export function createRequest(parentId?: number) {
  if (state.workspace == null) {
    console.warn("create workspace request called with no active workspace");
    return;
  }

  const data = {
    Request: {
      name: "",
      workspace_id: state.workspace.id,
      parent_id: parentId,
      method: "GET",
      url: "",
    },
  };

  invoke<WorkspaceEntryBase>("create_workspace_entry", {
    data,
  }).then((entry) => {
    index({
      ...entry,
      method: data.Request.method,
      url: data.Request.url,
      body: null,
      headers: {},
    });
    console.log("request created:", entry);
  });
}

export function createCollection(parentId?: number) {
  if (state.workspace == null) {
    console.warn("create workspace request called with no active workspace");
    return;
  }

  const data = {
    Collection: {
      name: "",
      workspace_id: state.workspace.id,
      parent_id: parentId,
    },
  };
  invoke<WorkspaceEntryBase>("create_workspace_entry", {
    data,
  }).then((entry) => {
    index(entry);
    console.log("collection created:", entry);
  });
}

export async function loadEnvironments(workspaceId: number) {
  state.environments = await invoke<WorkspaceEnvironment[]>(
    "list_environments",
    { workspaceId },
  );
}

export async function createEnvironment(workspaceId: number, name: string) {
  console.debug("creating environment in", workspaceId);
  const env = await invoke<WorkspaceEnvironment>("create_env", {
    workspaceId,
    name,
  });
  state.environment = env;
  state.environments.push(state.environment);
}

export async function updateEnvironment() {
  if (!state.environment) {
    console.warn("attempted to persist null env");
    return;
  }

  console.debug("updating environment", state.environment);

  await invoke("update_env", {
    id: state.environment.id,
    name: state.environment.name,
  });
}

export async function insertEnvVariable(
  workspaceId: number,
  envId: number,
  name: string = "",
  value: string = "",
  secret: boolean = false,
) {
  const v = await invoke<EnvVariable>("insert_env_var", {
    workspaceId,
    envId,
    name,
    value,
    secret,
  });

  state.environment?.variables.push(v);
}

export async function updateEnvVariable(v: EnvVariable) {
  if (v.name.length === 0 && v.value.length === 0) {
    console.debug("deleting var:", v);

    return deleteEnvVariable(v.id);
  }

  console.debug("updating var:", v);

  return invoke("update_env_var", {
    id: v.id,
    name: v.name,
    value: v.value,
    secret: v.secret,
  });
}

export async function deleteEnvVariable(id: number) {
  await invoke("delete_env_var", { id });
  state.environment!!.variables = state.environment!!.variables.filter(
    (v) => v.id !== id,
  );
}

type WorkspaceEntryResponse =
  | {
      type: "Collection";
      data: WorkspaceEntryBase;
    }
  | {
      type: "Request";
      data: WorkspaceRequestResponse;
    };

type WorkspaceRequestResponse = {
  entry: WorkspaceEntryBase;
  method: string;
  url: string;
  body: RequestBody | null;
  headers: { [key: string]: string };
};