#!/usr/bin/env bash

set -euo pipefail

repo_root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
vault_root="$repo_root/obsidian-vault"
documents_root="$vault_root/10 Dokumenter"
index_file="$vault_root/00 Start/Dokumentindeks.md"
active_index_file="$vault_root/00 Start/Aktiv dokumentation.md"
manifest_file="$vault_root/00 Start/Kildemanifest.tsv"

mkdir -p "$documents_root" "$(dirname "$index_file")"

# Kun denne mappe er maskinadministreret. Egne noter andre steder i vaulten bevares.
find "$documents_root" -type f -delete
find "$documents_root" -depth -type d -empty -delete

source_list="$(mktemp)"
index_entries="$(mktemp)"
trap 'rm -f "$source_list" "$index_entries"' EXIT

(
  cd "$repo_root"
  git -c core.quotepath=false ls-files --cached --others --exclude-standard -- \
    '*.md' '*.markdown' ':(exclude)obsidian-vault/**'
) | while IFS= read -r source_path; do
  # Et tracked dokument kan være slettet i worktree under en arkivflytning.
  # Kun eksisterende, ikke-ignorerede kilder må kopieres til vaulten.
  if [[ -f "$repo_root/$source_path" ]]; then
    printf '%s\n' "$source_path"
  fi
done | LC_ALL=C sort > "$source_list"

printf '%s\n\n' \
  '# Dokumentindeks' \
  '> [!info] Automatisk genereret' \
  '> Kør `./scripts/sync-obsidian-vault.sh` fra projektroden for at opdatere kopier og indeks.' \
  "Sidst synkroniseret: $(date '+%Y-%m-%d %H:%M:%S %Z')" \
  > "$index_file"

printf '%s\n\n' \
  '# Aktiv dokumentation' \
  '> [!info] Automatisk genereret' \
  '> Dette indeks skjuler arkiveret historik. Brug `Dokumentindeks.md` når ældre beslutninger eller fejlforløb skal findes.' \
  "Sidst synkroniseret: $(date '+%Y-%m-%d %H:%M:%S %Z')" \
  > "$active_index_file"

printf 'source\tvault_path\n' > "$manifest_file"

document_count=0

while IFS= read -r source_path; do
  case "$source_path" in
    _archive/*|archive/*|docs/archived/*|tmp/*|_temp/*)
      section_order=100
      section='Arkiv'
      relative_path="$source_path"
      ;;
    .claude/*|.codex/*|.github/*|AGENTS.md|CLAUDE.md|GEMINI.md)
      section_order=10
      section='AI og Codex'
      relative_path="$source_path"
      ;;
    docs/architecture*|docs/*ARCHITECTURE*|docs/*SYSTEM*|docs/MISSION.md)
      section_order=20
      section='Arkitektur'
      relative_path="${source_path#docs/}"
      ;;
    docs/features/*)
      section_order=30
      section='Funktioner'
      relative_path="${source_path#docs/features/}"
      ;;
    docs/guides/*)
      section_order=40
      section='Vejledninger'
      relative_path="${source_path#docs/guides/}"
      ;;
    docs/api/*)
      section_order=50
      section='API'
      relative_path="Produkt/${source_path#docs/api/}"
      ;;
    apitest/*)
      section_order=50
      section='API'
      relative_path="Test/${source_path#apitest/}"
      ;;
    docs/deployment/*|docs/*DEPLOYMENT*|docs/*LOGGING*|docs/*BACKUP*|docs/*PORT*|backend/LOGGING.md)
      section_order=60
      section='Drift og deployment'
      relative_path="$source_path"
      ;;
    tests/*)
      section_order=70
      section='Test og kvalitet'
      relative_path="${source_path#tests/}"
      ;;
    docs/status-reports/*|status.md)
      section_order=80
      section='Status'
      relative_path="Rapporter/${source_path#docs/status-reports/}"
      ;;
    docs/summaries/*)
      section_order=80
      section='Status'
      relative_path="Opsummeringer/${source_path#docs/summaries/}"
      ;;
    docs/plans/*|*PLAN.md|*PLAN_*|*IMPLEMENTATION_PLAN*)
      section_order=90
      section='Planer'
      relative_path="$source_path"
      ;;
    backend/scripts/*)
      section_order=110
      section='Backend-noter'
      relative_path="${source_path#backend/scripts/}"
      ;;
    docs/*)
      section_order=120
      section='Projektdokumentation'
      relative_path="${source_path#docs/}"
      ;;
    *)
      section_order=130
      section='Projektrod og øvrigt'
      relative_path="$source_path"
      ;;
  esac

  destination="$documents_root/$section/$relative_path"
  mkdir -p "$(dirname "$destination")"
  cp -p "$repo_root/$source_path" "$destination"

  vault_relative="${destination#"$vault_root/"}"
  link_target="${vault_relative%.*}"
  title="$(basename "${source_path%.*}")"

  printf '%03d\t%s\t%s\t%s\t%s\n' \
    "$section_order" "$section" "$link_target" "$title" "$source_path" >> "$index_entries"
  printf '%s\t%s\n' "$source_path" "$vault_relative" >> "$manifest_file"
  document_count=$((document_count + 1))
done < "$source_list"

current_section=''
active_current_section=''
active_document_count=0
archived_document_count=0
while IFS=$'\t' read -r _ section link_target title source_path; do
  if [[ "$current_section" != "$section" ]]; then
    printf '\n## %s\n\n' "$section" >> "$index_file"
    current_section="$section"
  fi

  printf -- '- [[%s|%s]] — `%s`\n' "$link_target" "$title" "$source_path" >> "$index_file"

  if [[ "$section" == 'Arkiv' ]]; then
    archived_document_count=$((archived_document_count + 1))
    continue
  fi

  if [[ "$active_current_section" != "$section" ]]; then
    printf '\n## %s\n\n' "$section" >> "$active_index_file"
    active_current_section="$section"
  fi

  printf -- '- [[%s|%s]] — `%s`\n' "$link_target" "$title" "$source_path" >> "$active_index_file"
  active_document_count=$((active_document_count + 1))
done < <(LC_ALL=C sort -t $'\t' -k1,1n -k5,5 "$index_entries")

printf '\n---\n\n**I alt: %d dokumenter.**\n' "$document_count" >> "$index_file"
printf '\n---\n\n**Aktive dokumenter: %d. Arkiverede dokumenter: %d.**\n' \
  "$active_document_count" "$archived_document_count" >> "$active_index_file"
printf 'Synkroniserede %d Markdown-filer til %s\n' "$document_count" "$vault_root"