import type { DatabaseSync } from "node:sqlite";
import type { BoardOp, BoardSnapshot } from "../../packages/gateway-protocol/src/index.js";
import { executeSqliteQuerySync, getNodeSqliteKysely } from "../infra/kysely-sync.js";
import {
  runSqliteDeferredTransactionSync,
  runSqliteImmediateTransactionSync,
} from "../infra/sqlite-transaction.js";
import { ensureOpenClawAgentBoardSchemaInTransaction } from "../state/openclaw-agent-board-schema.js";
import type { DB as OpenClawAgentKyselyDatabase } from "../state/openclaw-agent-db.generated.js";
import type { OpenClawAgentDatabase } from "../state/openclaw-agent-db.js";
import { applyBoardOps, BoardValidationError, normalizeBoardLayout } from "./board-layout.js";
import {
  cloneBoardSnapshot,
  createBoardWidgetPutResult,
  createBoardGrantSnapshot,
  createBoardWidgetPutSnapshot,
  normalizeBoardWidgetPutParams,
  type BoardWidgetHtmlViewMetadata,
  type BoardSnapshotWithHtmlViewMetadata,
} from "./board-store.js";
import {
  createBoardWidgetContentFields,
  parseDescriptor,
  parseManifest,
  parsePluginContent,
  resolveSqliteBoardWidgetPutParams,
  rowToTab,
  rowToHtmlViewMetadata,
  rowToWidget,
  serializeManifest,
  updateManifestHeightMode,
  type SelectedBoardTabRow,
  type SelectedBoardWidgetSnapshotRow,
} from "./sqlite-board-codec.js";
import { getBoardReadQueries } from "./sqlite-board-read-queries.js";

type BoardDatabase = Pick<
  OpenClawAgentKyselyDatabase,
  "board_tabs" | "board_widgets" | "session_nodes"
>;
type BoardDatabaseHandle = Pick<OpenClawAgentDatabase, "db" | "path">;

type StoredBoard = {
  snapshot: BoardSnapshot;
  tabRows: SelectedBoardTabRow[];
  widgetRows: SelectedBoardWidgetSnapshotRow[];
  htmlViewMetadata: ReadonlyMap<string, BoardWidgetHtmlViewMetadata>;
};

const ensuredBoardDatabases = new WeakSet<DatabaseSync>();
const presentBoardDatabases = new WeakSet<DatabaseSync>();
const BOARD_WRITE_BATCH_SIZE = 64;

// Read-only connections cannot run the lazy DDL, and a pre-existing v13 DB has
// no board tables until the first write. Reads must treat that as "no boards",
// not "no such table".
function boardTablesPresent(database: Pick<OpenClawAgentDatabase, "db">): boolean {
  if (ensuredBoardDatabases.has(database.db) || presentBoardDatabases.has(database.db)) {
    return true;
  }
  const row = database.db // sqlite-allow-raw: catalog probe before Kysely table access.
    .prepare("SELECT 1 FROM sqlite_master WHERE type = 'table' AND name = 'board_widgets'")
    .get();
  if (!row) {
    return false;
  }
  presentBoardDatabases.add(database.db);
  return true;
}

export function ensureBoardSchema(database: OpenClawAgentDatabase): void {
  if (ensuredBoardDatabases.has(database.db)) {
    return;
  }
  if (database.db.isTransaction) {
    throw new Error("board schema must be ensured before the write transaction starts");
  }
  runSqliteImmediateTransactionSync(
    database.db,
    () => ensureOpenClawAgentBoardSchemaInTransaction(database.db),
    {
      databaseLabel: database.path,
      operationLabel: "board.ensure-schema",
    },
  );
  // Additive-surface rule: fold this into the next natural schema bump, then delete this lazy ensure.
  ensuredBoardDatabases.add(database.db);
  presentBoardDatabases.add(database.db);
}

function readStoredBoard(database: BoardDatabaseHandle, sessionKey: string): StoredBoard {
  // Write callers already hold an IMMEDIATE transaction; the shared helper nests
  // this consistent read as a savepoint instead of issuing a second BEGIN.
  return runSqliteDeferredTransactionSync(
    database.db,
    () => {
      const queries = getBoardReadQueries(database.db);
      const tabRows = queries.tabs(sessionKey).rows;
      const selectedWidgetRows = queries.widgets(sessionKey).rows;
      const parsedWidgetRows = selectedWidgetRows.map((row) => ({
        row,
        manifest: parseManifest(row.manifest),
      }));
      // Rows without the canonical authority snapshot predate this unreleased contract.
      // Keep them out of runtime state so they can never mint an interactive lease.
      const admittedWidgetRows = parsedWidgetRows.filter(({ row, manifest }) => {
        if (row.content_kind !== "mcp-app") {
          return true;
        }
        return manifest.mcpAppInteractive !== undefined && manifest.mcpAppInstanceId !== undefined;
      });
      const htmlViewMetadata = new Map<string, BoardWidgetHtmlViewMetadata>();
      for (const { row, manifest } of admittedWidgetRows) {
        const metadata = rowToHtmlViewMetadata(row, manifest);
        if (metadata) {
          htmlViewMetadata.set(row.name, metadata);
        }
      }
      const layout = normalizeBoardLayout({
        tabs: tabRows.map(rowToTab),
        widgets: admittedWidgetRows.map(({ row, manifest }) => rowToWidget(row, manifest)),
      });
      return {
        snapshot: {
          sessionKey,
          // Board existence is row-defined; deleting the last empty tab removes
          // the board, so a later read starts again at the empty revision.
          revision: tabRows.reduce((revision, row) => Math.max(revision, row.revision), 0),
          ...layout,
        },
        tabRows,
        widgetRows: admittedWidgetRows.map(({ row }) => row),
        htmlViewMetadata,
      };
    },
    { databaseLabel: database.path, operationLabel: "board.read" },
  );
}

function upsertTabs(
  database: BoardDatabaseHandle,
  previous: StoredBoard,
  next: BoardSnapshot,
): void {
  const db = getNodeSqliteKysely<BoardDatabase>(database.db);
  const createdBy = new Map(previous.tabRows.map((row) => [row.tab_id, row.created_by]));
  for (let index = 0; index < next.tabs.length; index += BOARD_WRITE_BATCH_SIZE) {
    executeSqliteQuerySync(
      database.db,
      db
        .insertInto("board_tabs")
        .values(
          next.tabs.slice(index, index + BOARD_WRITE_BATCH_SIZE).map((tab) => ({
            session_key: next.sessionKey,
            tab_id: tab.tabId,
            title: tab.title,
            position: tab.position,
            chat_dock: tab.chatDock,
            created_by: createdBy.get(tab.tabId) ?? "agent",
            revision: next.revision,
          })),
        )
        .onConflict((conflict) =>
          conflict.columns(["session_key", "tab_id"]).doUpdateSet({
            title: (eb) => eb.ref("excluded.title"),
            position: (eb) => eb.ref("excluded.position"),
            chat_dock: (eb) => eb.ref("excluded.chat_dock"),
            revision: (eb) => eb.ref("excluded.revision"),
          }),
        ),
    );
  }
}

function updateWidgetLayouts(
  database: BoardDatabaseHandle,
  snapshot: BoardSnapshot,
  updatedAt: number,
): void {
  const db = getNodeSqliteKysely<BoardDatabase>(database.db);
  for (const widget of snapshot.widgets) {
    executeSqliteQuerySync(
      database.db,
      db
        .updateTable("board_widgets")
        .set({
          tab_id: widget.tabId,
          title: widget.title ?? null,
          size_w: widget.sizeW,
          size_h: widget.sizeH,
          position: widget.position,
          updated_at: updatedAt,
        })
        .where("session_key", "=", snapshot.sessionKey)
        .where("name", "=", widget.name),
    );
  }
}

function updateWidgetHeightModes(
  database: BoardDatabaseHandle,
  previous: StoredBoard,
  ops: readonly BoardOp[],
): void {
  const db = getNodeSqliteKysely<BoardDatabase>(database.db);
  for (const op of ops) {
    if (op.kind !== "widget_resize") {
      continue;
    }
    const row = previous.widgetRows.find((candidate) => candidate.name === op.name);
    if (!row) {
      continue;
    }
    executeSqliteQuerySync(
      database.db,
      db
        .updateTable("board_widgets")
        .set({ manifest: updateManifestHeightMode(row.manifest, op.heightMode ?? "fixed") })
        .where("session_key", "=", previous.snapshot.sessionKey)
        .where("name", "=", op.name),
    );
  }
}

function deleteRemovedWidgets(
  database: BoardDatabaseHandle,
  previous: StoredBoard,
  next: BoardSnapshot,
): void {
  const db = getNodeSqliteKysely<BoardDatabase>(database.db);
  const widgetNames = new Set(next.widgets.map((widget) => widget.name));
  const removed = previous.widgetRows.filter((row) => !widgetNames.has(row.name));
  for (let index = 0; index < removed.length; index += BOARD_WRITE_BATCH_SIZE) {
    executeSqliteQuerySync(
      database.db,
      db
        .deleteFrom("board_widgets")
        .where("session_key", "=", next.sessionKey)
        .where(
          "name",
          "in",
          removed.slice(index, index + BOARD_WRITE_BATCH_SIZE).map((row) => row.name),
        ),
    );
  }
}

function deleteRemovedTabs(
  database: BoardDatabaseHandle,
  previous: StoredBoard,
  next: BoardSnapshot,
): void {
  const db = getNodeSqliteKysely<BoardDatabase>(database.db);
  const tabIds = new Set(next.tabs.map((tab) => tab.tabId));
  const removed = previous.tabRows.filter((row) => !tabIds.has(row.tab_id));
  for (let index = 0; index < removed.length; index += BOARD_WRITE_BATCH_SIZE) {
    executeSqliteQuerySync(
      database.db,
      db
        .deleteFrom("board_tabs")
        .where("session_key", "=", next.sessionKey)
        .where(
          "tab_id",
          "in",
          removed.slice(index, index + BOARD_WRITE_BATCH_SIZE).map((row) => row.tab_id),
        ),
    );
  }
}

export function hasBoardSession(database: BoardDatabaseHandle, sessionKey: string): boolean {
  const row = getBoardReadQueries(database.db).session(sessionKey).rows[0];
  if (!row) {
    return false;
  }
  try {
    const entry = JSON.parse(row.entry_json) as unknown;
    return Boolean(
      entry &&
      typeof entry === "object" &&
      !Array.isArray(entry) &&
      "sessionId" in entry &&
      typeof entry.sessionId === "string",
    );
  } catch {
    return false;
  }
}

export function readBoardSessionKeys(database: BoardDatabaseHandle): string[] {
  if (!boardTablesPresent(database)) {
    return [];
  }
  const db = getNodeSqliteKysely<BoardDatabase>(database.db);
  // Every persisted widget belongs to a tab, so tab owners cover the board inventory.
  return executeSqliteQuerySync(
    database.db,
    db.selectFrom("board_tabs").select("session_key").distinct(),
  ).rows.map((row) => row.session_key);
}

export function readBoardSnapshotWithHtmlViewMetadata(
  database: BoardDatabaseHandle,
  sessionKey: string,
): BoardSnapshotWithHtmlViewMetadata | undefined {
  if (!hasBoardSession(database, sessionKey) || !boardTablesPresent(database)) {
    return undefined;
  }
  const stored = readStoredBoard(database, sessionKey);
  return { snapshot: stored.snapshot, htmlViewMetadata: stored.htmlViewMetadata };
}

export function readBoardWidgetRow(
  database: BoardDatabaseHandle,
  sessionKey: string,
  name: string,
) {
  if (!hasBoardSession(database, sessionKey) || !boardTablesPresent(database)) {
    return undefined;
  }
  const db = getNodeSqliteKysely<BoardDatabase>(database.db);
  const row = executeSqliteQuerySync(
    database.db,
    db
      .selectFrom("board_widgets")
      .select([
        "content_kind",
        "html",
        "descriptor_json",
        "title",
        "revision",
        "sha256",
        "view_generation",
        "grant_state",
        "manifest",
      ])
      .where("session_key", "=", sessionKey)
      .where("name", "=", name)
      .limit(1),
  ).rows[0];
  return row;
}

export function applyBoardOpsToDatabase(
  database: BoardDatabaseHandle,
  sessionKey: string,
  ops: readonly BoardOp[],
): BoardSnapshot {
  if (!hasBoardSession(database, sessionKey)) {
    throw new BoardValidationError("not_found", `board session not found: ${sessionKey}`);
  }
  const previous = readStoredBoard(database, sessionKey);
  const layout = applyBoardOps(previous.snapshot, ops);
  const next: BoardSnapshot = {
    sessionKey,
    revision: previous.snapshot.revision + 1,
    ...layout,
  };
  const now = Date.now();
  upsertTabs(database, previous, next);
  deleteRemovedWidgets(database, previous, next);
  updateWidgetLayouts(database, next, now);
  updateWidgetHeightModes(database, previous, ops);
  deleteRemovedTabs(database, previous, next);
  return cloneBoardSnapshot(next);
}

export function putBoardWidgetInDatabase(
  database: BoardDatabaseHandle,
  sessionKey: string,
  canonicalInput: ReturnType<typeof normalizeBoardWidgetPutParams>,
  viewGeneration: string,
) {
  if (!hasBoardSession(database, sessionKey)) {
    throw new BoardValidationError("not_found", `board session not found: ${sessionKey}`);
  }
  const previous = readStoredBoard(database, sessionKey);
  const canonicalParams = resolveSqliteBoardWidgetPutParams(
    previous.snapshot,
    canonicalInput,
    previous.widgetRows,
  );
  const existing = previous.widgetRows.find((row) => row.name === canonicalParams.name);
  const grantScopeMatches = existing
    ? existing.content_kind === "html"
      ? canonicalParams.content.kind === "html"
      : existing.content_kind === "mcp-app"
        ? existing.descriptor_json !== null &&
          canonicalParams.content.kind === "mcp-app" &&
          parseDescriptor(existing.descriptor_json).serverName ===
            canonicalParams.content.descriptor.serverName
        : existing.descriptor_json !== null &&
          (canonicalParams.content.kind === "plugin" ||
            canonicalParams.content.kind === "registered") &&
          parsePluginContent(existing.descriptor_json).pluginKind ===
            canonicalParams.content.pluginKind
    : true;
  const next = createBoardWidgetPutSnapshot(previous.snapshot, canonicalParams, {
    grantScopeMatches,
    grantedSha256: existing?.granted_sha ?? undefined,
    instanceId: viewGeneration,
  });
  const widget = next.widgets.find((candidate) => candidate.name === canonicalParams.name)!;
  const now = Date.now();
  upsertTabs(database, previous, next);
  const db = getNodeSqliteKysely<BoardDatabase>(database.db);
  const fields = createBoardWidgetContentFields(
    canonicalParams,
    { presentation: widget.presentation, heightMode: widget.heightMode },
    widget.revision,
    widget.grantState,
    widget.instanceId!,
    now,
  );
  executeSqliteQuerySync(
    database.db,
    db
      .insertInto("board_widgets")
      .values({
        session_key: sessionKey,
        name: canonicalParams.name,
        tab_id: widget.tabId,
        title: widget.title ?? null,
        size_w: widget.sizeW,
        size_h: widget.sizeH,
        position: widget.position,
        created_by: existing?.created_by ?? "agent",
        created_at: existing?.created_at ?? now,
        ...fields,
      })
      .onConflict((conflict) =>
        conflict.columns(["session_key", "name"]).doUpdateSet({
          tab_id: widget.tabId,
          title: widget.title ?? null,
          size_w: widget.sizeW,
          size_h: widget.sizeH,
          position: widget.position,
          ...fields,
        }),
      ),
  );
  updateWidgetLayouts(database, next, now);
  return createBoardWidgetPutResult(next, canonicalParams.name);
}

export function grantBoardWidgetInDatabase(
  database: BoardDatabaseHandle,
  sessionKey: string,
  name: string,
  decision: "granted" | "rejected",
  revision: number,
  instanceId?: string,
): BoardSnapshot {
  if (!hasBoardSession(database, sessionKey)) {
    throw new BoardValidationError("not_found", `board session not found: ${sessionKey}`);
  }
  const previous = readStoredBoard(database, sessionKey);
  const next = createBoardGrantSnapshot(previous.snapshot, name, decision, revision, instanceId);
  upsertTabs(database, previous, next);
  const widget = next.widgets.find((candidate) => candidate.name === name)!;
  if (!widget.contentOwner) {
    throw new BoardValidationError(
      "invalid_operation",
      `board widget ${name} content ownership is unavailable`,
    );
  }
  const row = previous.widgetRows.find((candidate) => candidate.name === name)!;
  const manifest = parseManifest(row.manifest);
  const declared = manifest.declared;
  const db = getNodeSqliteKysely<BoardDatabase>(database.db);
  executeSqliteQuerySync(
    database.db,
    db
      .updateTable("board_widgets")
      .set({
        grant_state: decision,
        granted_sha: decision === "granted" ? row.sha256 : null,
        manifest: serializeManifest(
          {
            contentOwner: widget.contentOwner,
            ...(widget.registeredContentKind
              ? { registeredContentKind: widget.registeredContentKind }
              : {}),
          },
          declared,
          decision,
          manifest.mcpAppInteractive !== undefined && manifest.mcpAppInstanceId
            ? {
                kind: "mcp-app" as const,
                interactive: manifest.mcpAppInteractive,
                instanceId: manifest.mcpAppInstanceId,
              }
            : manifest.registeredInstanceId
              ? { kind: "registered" as const, instanceId: manifest.registeredInstanceId }
              : undefined,
          {
            presentation: manifest.presentation,
            heightMode: manifest.heightMode,
          },
          manifest.nameIdentity,
        ),
        updated_at: Date.now(),
      })
      .where("session_key", "=", sessionKey)
      .where("name", "=", name),
  );
  return cloneBoardSnapshot(next);
}