import GLib from "gi://GLib"

const BRAIN_ROOT = GLib.getenv("BRAIN_ROOT")
  || readFile(GLib.get_home_dir() + "/.config/brain-path")?.trim()
  || GLib.get_home_dir() + "/Dev/Brain"

export interface BrainState {
  focus: string
  todos: { open: number; done: number; top3: string[] }
  session: string | null
}

function readFile(path: string): string | null {
  try {
    const [ok, contents] = GLib.file_get_contents(path)
    if (ok && contents) {
      return new TextDecoder().decode(contents)
    }
  } catch {}
  return null
}

export function getFocus(): string {
  const content = readFile(`${BRAIN_ROOT}/focus.md`)
  if (!content) return "no focus"
  // skip header lines, get the meat
  const lines = content.split("\n").filter(
    (l) => !l.startsWith("#") && !l.startsWith(">") && l.trim() !== "" && !l.startsWith("---")
  )
  return lines[0]?.trim() || "no focus"
}

export function getTodos(): { open: number; done: number; top3: string[] } {
  const content = readFile(`${BRAIN_ROOT}/todo/README.md`)
  if (!content) return { open: 0, done: 0, top3: [] }

  const lines = content.split("\n")
  const open: string[] = []
  let done = 0

  for (const line of lines) {
    const trimmed = line.trim()
    if (trimmed.startsWith("- [ ]") || trimmed.startsWith("⬜")) {
      open.push(trimmed.replace(/^- \[ \] /, "").replace(/^⬜ ?/, ""))
    } else if (trimmed.startsWith("- [x]") || trimmed.startsWith("✅")) {
      done++
    }
  }

  return {
    open: open.length,
    done,
    top3: open.slice(0, 3),
  }
}

export function getSession(): string | null {
  try {
    const [ok, contents] = GLib.file_get_contents(
      GLib.get_home_dir() + "/.claude/session-role"
    )
    if (ok && contents) {
      return new TextDecoder().decode(contents).trim()
    }
  } catch {}
  return null
}

export function getBrainState(): BrainState {
  return {
    focus: getFocus(),
    todos: getTodos(),
    session: getSession(),
  }
}