import { writeFile, mkdir } from 'node:fs/promises'
import { simpleGit } from 'simple-git'
import { VAULT_PATH } from '../config.js'
import { VAULT_SUBDIRS, todayIso, vaultPath, vaultRelFrom, isoWeekId } from '../vault.js'
import { listVaultNotes } from '../memory-graph.js'
import type { MissionFn } from './types.js'
import { logger } from '../logger.js'

const git = simpleGit(VAULT_PATH)

export const weeklyReview: MissionFn = async (ctx) => {
  const now = ctx.now
  const date = now.toISOString().slice(0, 10)
  const weekId = isoWeekId(date)
  const fileAbs = vaultPath(VAULT_SUBDIRS.progress, `${weekId}.md`)
  const rel = vaultRelFrom(fileAbs)

  const days = []
  for (let i = 0; i < 7; i++) {
    const d = new Date(now.getTime() - i * 86_400_000)
    days.push(d.toISOString().slice(0, 10))
  }

  const dailyPaths = days.map(iso => vaultPath(VAULT_SUBDIRS.daily, `${iso}.md`))
  const linkBlock = dailyPaths
    .map(abs => `- [[${vaultRelFrom(abs)}]]`)
    .join('\n')

  const ideas = listVaultNotes('06_Projects/ideas')
    .filter(n => n.relPath.endsWith('/index.md'))
    .filter(n => now.getTime() - n.mtime < 7 * 86_400_000)
  const captures = listVaultNotes('04_Notes/inbox')
    .filter(n => now.getTime() - n.mtime < 7 * 86_400_000)

  const body = `---
created: ${todayIso()}
week: ${weekId}
tags: [weekly-review, auto]
---

# Weekly review — ${weekId}

## Days
${linkBlock}

## Captures this week
${captures.map(n => `- [[${vaultRelFrom(n.absPath)}]]`).join('\n') || '- _none_'}

## Ideas touched
${ideas.map(n => `- [[${vaultRelFrom(n.absPath)}]]`).join('\n') || '- _none_'}

## Reflections

- What advanced?
- What slipped?
- What changes next week?
`
  await mkdir(vaultPath(VAULT_SUBDIRS.progress), { recursive: true })
  await writeFile(fileAbs, body)

  try {
    await git.add(rel)
    await git.commit(`[mc] weekly-review: ${rel}`)
    try {
      await git.push()
    } catch (err) {
      logger.warn({ err }, 'weekly push failed')
    }
  } catch (err) {
    logger.warn({ err }, 'weekly commit failed')
  }

  await ctx.send(`<b>Weekly review</b> · <code>${rel}</code> written. Fill in reflections.`)
  return { summary: 'weekly review written', data: { weekId } }
}