import { Database } from "@/storage/db"

import { inArray } from "drizzle-orm"

import { EventSequenceTable } from "@/sync/event.sql"

import { Workspace } from "@/control-plane/workspace"

import type { WorkspaceID } from "@/control-plane/schema"

import * as Log from "@opencode-ai/core/util/log"

import { AppRuntime } from "@/effect/app-runtime"

import { Effect } from "effect"

export const HEADER = "x-opencode-sync"

export type State = Record<string, number>

const log = Log.create({ service: "fence" })

export function load(ids?: string[]) {

const rows = Database.use((db) => {

if (!ids?.length) {

return db.select().from(EventSequenceTable).all()

}

return db.select().from(EventSequenceTable).where(inArray(EventSequenceTable.aggregate_id, ids)).all()

})

return Object.fromEntries(rows.map((row) => [row.aggregate_id, row.seq])) as State

}

export function diff(prev: State, next: State) {

const ids = new Set([...Object.keys(prev), ...Object.keys(next)])

return Object.fromEntries(

[...ids]

.map((id) => [id, next[id] ?? -1] as const)

.filter(([id, seq]) => {

return (prev[id] ?? -1) !== seq

}),

) as State

}

export function parse(headers: Headers) {

const raw = headers.get(HEADER)

if (!raw) return

let data

try {

data = JSON.parse(raw)

} catch {

return

}

if (!data || typeof data !== "object") return

return Object.fromEntries(

Object.entries(data).filter(([id, seq]) => {

return typeof id === "string" && Number.isInteger(seq)

}),

) as State

}

export function waitEffect(workspaceID: WorkspaceID, state: State, signal?: AbortSignal) {

return Effect.gen(function* () {

log.info("waiting for state", {

workspaceID,

state,

})

yield* Workspace.Service.use((workspace) => workspace.waitForSync(workspaceID, state, signal))

log.info("state fully synced", {

workspaceID,

state,

})

})

}

export async function wait(workspaceID: WorkspaceID, state: State, signal?: AbortSignal) {

await AppRuntime.runPromise(waitEffect(workspaceID, state, signal))

}