import GLib from "gi://GLib"
import { exec } from "ags/process"

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
  intentions: { active: number; names: string[] }
  repos: { name: string; status: string }[]
  commits: string[]
  kernelVersion: string
}

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
}

function sh(cmd: string): string {
  try { return exec(`bash -c "${cmd}"`).trim() } catch { return "" }
}

export function getFocus(): string {
  const content = readFile(`${BRAIN_ROOT}/focus.md`)
  if (!content) return "no focus"
  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 getIntentions(): { active: number; names: string[] } {
  try {
    const out = sh(`grep -rl 'status: active' ${BRAIN_ROOT}/intentions/*.yml 2>/dev/null | while read f; do grep '^name:' "$f" | head -1 | sed 's/name: //'; done`)
    const names = out.split("\n").filter(Boolean)
    return { active: names.length, names: names.slice(0, 5) }
  } catch {
    return { active: 0, names: [] }
  }
}

export function getRepoStatus(): { name: string; status: string }[] {
  const repos = [
    { name: "brain", path: BRAIN_ROOT },
    { name: "toolkit", path: `${BRAIN_ROOT}/toolkit` },
    { name: "progression", path: `${BRAIN_ROOT}/progression` },
  ]

  return repos.map(({ name, path }) => {
    const count = sh(`git -C ${path} status --short 2>/dev/null | wc -l`)
    const n = parseInt(count) || 0
    return {
      name,
      status: n === 0 ? "✅" : `⚠️ ${n} fichiers`,
    }
  })
}

export function getRecentCommits(): string[] {
  const out = sh(`git -C ${BRAIN_ROOT} log --oneline -5 2>/dev/null`)
  return out.split("\n").filter(Boolean)
}

export function getKernelVersion(): string {
  const content = readFile(`${BRAIN_ROOT}/brain-compose.yml`)
  if (!content) return "?"
  const match = content.match(/^version:\s*"?([^"\n]+)"?/m)
  return match ? match[1] : "?"
}

export function getBrainState(): BrainState {
  return {
    focus: getFocus(),
    todos: getTodos(),
    session: getSession(),
    intentions: getIntentions(),
    repos: getRepoStatus(),
    commits: getRecentCommits(),
    kernelVersion: getKernelVersion(),
  }
}