#!/usr/bin/env bash
# offinfra-onboard — migrate a Canonical (Forgejo) repo's image build to
# GitHub Actions → ghcr.io (ADR-0002, PRD infra#10). Idempotent: re-running
# skips every already-done step.
#
# What it does:
#   1. Ensures the GitHub mirror repo exists (right visibility; unarchives).
#   2. Sets GHA secrets (WOODPECKER_TOKEN, FORGEJO_GIT_TOKEN, SLACK_WEBHOOK).
#   3. Ensures the Forgejo push-mirror (sync_on_commit) + fires an initial sync.
#   4. Registers the mirror in Woodpecker (github forge) → deploy repo id.
#   5. Renders .github/workflows/build.yml + .woodpecker/deploy.yml into the
#      clone, removes the old in-cluster build pipeline.
#   6. Commits on the FORGEJO side and pushes master (this fires the chain).
#   7. Flips the GitHub default branch to master once the mirror has synced.
#
# Usage:
#   offinfra-onboard <name> --clone <path> --visibility private|public \
#     --namespace <ns> --deploy "<deployment>=<container>[,<container>...]" \
#     [--image <ghcr-image-name>] [--context <docker-context>] \
#     [--test-steps <yaml-file>] [--dry-run]
#
#   --deploy is repeatable. --test-steps points at a YAML fragment of extra
#   steps for the lint-and-test job (indented for a `steps:` list); omitted =
#   a no-op test job.
set -euo pipefail

SCRIPT_DIR=$(cd "$(dirname "$0")" && pwd)
TEMPLATES="$SCRIPT_DIR/offinfra-templates"
GH_OWNER="ViktorBarzin"
FORGEJO_HOST="forgejo.viktorbarzin.me"
FORGEJO_LB="10.0.20.203"
WP_API="https://ci.viktorbarzin.me/api"

NAME=${1:?usage: offinfra-onboard <name> [flags]}; shift
CLONE="" VISIBILITY="" NAMESPACE="" IMAGE="" CONTEXT="." TEST_STEPS_FILE="" DRY_RUN=0
DEPLOYS=()
while [ $# -gt 0 ]; do
  case "$1" in
    --clone) CLONE=$2; shift 2;;
    --visibility) VISIBILITY=$2; shift 2;;
    --namespace) NAMESPACE=$2; shift 2;;
    --image) IMAGE=$2; shift 2;;
    --context) CONTEXT=$2; shift 2;;
    --deploy) DEPLOYS+=("$2"); shift 2;;
    --test-steps) TEST_STEPS_FILE=$2; shift 2;;
    --dry-run) DRY_RUN=1; shift;;
    *) echo "unknown flag: $1" >&2; exit 1;;
  esac
done
IMAGE=${IMAGE:-$NAME}
[ -n "$CLONE" ] && [ -d "$CLONE/.git" ] || { echo "--clone must point at a git clone" >&2; exit 1; }
[ "$VISIBILITY" = "private" ] || [ "$VISIBILITY" = "public" ] || { echo "--visibility private|public" >&2; exit 1; }
[ -n "$NAMESPACE" ] || { echo "--namespace required" >&2; exit 1; }
[ ${#DEPLOYS[@]} -gt 0 ] || { echo "at least one --deploy required" >&2; exit 1; }

log() { printf '\033[1m[%s]\033[0m %s\n' "$NAME" "$*"; }
run() { if [ "$DRY_RUN" = 1 ]; then echo "DRY: $*"; else "$@"; fi; }

# --- credentials ---
export VAULT_ADDR=${VAULT_ADDR:-https://vault.viktorbarzin.me}
WP_TOKEN=$(vault kv get -field=woodpecker_api_token secret/ci/global)
SLACK_WEBHOOK=$(vault kv get -field=slack_webhook secret/ci/global)
GH_PAT=$(vault kv get -field=github_pat secret/viktor)
# Forgejo token: from the clone's forgejo remote URL (the documented contract)
FORGEJO_REMOTE=$(git -C "$CLONE" remote -v | awk -v h="$FORGEJO_HOST" '$2 ~ h && $3 == "(push)" {print $1; exit}')
[ -n "$FORGEJO_REMOTE" ] || { echo "no forgejo remote in $CLONE" >&2; exit 1; }
FORGEJO_TOKEN=$(git -C "$CLONE" remote get-url "$FORGEJO_REMOTE" | sed -n 's#https://[^:]*:\([^@]*\)@.*#\1#p')
[ -n "$FORGEJO_TOKEN" ] || { echo "could not extract forgejo token from remote URL" >&2; exit 1; }

FJ() { curl -sf --resolve "$FORGEJO_HOST:443:$FORGEJO_LB" -H "Authorization: token $FORGEJO_TOKEN" -H 'Content-Type: application/json' "$@"; }
WP() { curl -sf -H "Authorization: Bearer $WP_TOKEN" -H 'Content-Type: application/json' "$@"; }

# --- 1) GitHub mirror repo ---
if state=$(gh api "repos/$GH_OWNER/$NAME" --jq '{archived,private}' 2>/dev/null); then
  archived=$(jq -r .archived <<<"$state"); private=$(jq -r .private <<<"$state")
  if [ "$archived" = "true" ]; then
    log "GitHub repo exists but is ARCHIVED — unarchiving"
    run gh api -X PATCH "repos/$GH_OWNER/$NAME" -F archived=false >/dev/null
  fi
  want_private=$([ "$VISIBILITY" = private ] && echo true || echo false)
  if [ "$private" != "$want_private" ]; then
    log "setting visibility -> $VISIBILITY"
    run gh api -X PATCH "repos/$GH_OWNER/$NAME" -F private="$want_private" >/dev/null
  else
    log "GitHub repo visibility already $VISIBILITY — SKIP"
  fi
else
  log "creating GitHub mirror repo ($VISIBILITY)"
  run gh repo create "$GH_OWNER/$NAME" "--$VISIBILITY" \
    --description "One-way mirror of forgejo viktor/$NAME — do NOT commit here (ADR-0002)" >/dev/null
fi

# --- 2) GHA secrets ---
log "setting GHA secrets (WOODPECKER_TOKEN, FORGEJO_GIT_TOKEN, SLACK_WEBHOOK)"
if [ "$DRY_RUN" = 0 ]; then
  gh secret set WOODPECKER_TOKEN  -R "$GH_OWNER/$NAME" --body "$WP_TOKEN"
  gh secret set FORGEJO_GIT_TOKEN -R "$GH_OWNER/$NAME" --body "$FORGEJO_TOKEN"
  gh secret set SLACK_WEBHOOK     -R "$GH_OWNER/$NAME" --body "$SLACK_WEBHOOK"
fi

# --- 3) Forgejo push-mirror ---
mirrors=$(FJ "https://$FORGEJO_HOST/api/v1/repos/viktor/$NAME/push_mirrors" || echo '[]')
if printf '%s' "$mirrors" | jq -e --arg a "github.com/$GH_OWNER/$NAME" '.[] | select(.remote_address | contains($a))' >/dev/null 2>&1; then
  log "push-mirror already configured — SKIP"
else
  log "creating push-mirror -> github.com/$GH_OWNER/$NAME (sync_on_commit)"
  run FJ -X POST "https://$FORGEJO_HOST/api/v1/repos/viktor/$NAME/push_mirrors" \
    -d "{\"remote_address\":\"https://github.com/$GH_OWNER/$NAME.git\",\"remote_username\":\"$GH_OWNER\",\"remote_password\":$(jq -Rn --arg p "$GH_PAT" '$p'),\"interval\":\"8h0m0s\",\"sync_on_commit\":true}" >/dev/null
fi
log "firing initial mirror sync"
run FJ -X POST "https://$FORGEJO_HOST/api/v1/repos/viktor/$NAME/push_mirrors-sync" >/dev/null || true

# --- 4) Woodpecker registration (github forge) ---
WP_REPO_ID=$(WP "$WP_API/repos?perPage=100" | jq -r --arg n "$GH_OWNER/$NAME" '.[] | select(.full_name == $n) | .id' | head -1)
if [ -n "$WP_REPO_ID" ]; then
  log "Woodpecker repo already registered (id=$WP_REPO_ID) — SKIP"
else
  GH_REPO_ID=$(gh api "repos/$GH_OWNER/$NAME" --jq .id)
  log "registering mirror in Woodpecker (forge_remote_id=$GH_REPO_ID)"
  if [ "$DRY_RUN" = 0 ]; then
    WP_REPO_ID=$(WP -X POST "$WP_API/repos?forge_remote_id=$GH_REPO_ID" | jq -r .id)
  else
    WP_REPO_ID="DRY"
  fi
  log "Woodpecker repo id = $WP_REPO_ID"
fi

# --- 5) Render workflow + deploy files into the clone ---
DEPLOY_CMDS=""
for d in "${DEPLOYS[@]}"; do
  dep=${d%%=*}; containers=${d#*=}
  setargs=""
  IFS=',' read -ra cs <<<"$containers"
  for c in "${cs[@]}"; do setargs="$setargs $c=\${IMAGE_NAME}:\${IMAGE_TAG}"; done
  DEPLOY_CMDS="$DEPLOY_CMDS      - \"kubectl -n $NAMESPACE set image deployment/$dep$setargs\"\n"
  DEPLOY_CMDS="$DEPLOY_CMDS      - \"kubectl -n $NAMESPACE rollout status deployment/$dep --timeout=300s\"\n"
done
if [ -n "$TEST_STEPS_FILE" ]; then
  TEST_STEPS=$(cat "$TEST_STEPS_FILE")
else
  TEST_STEPS='      - run: echo "no test steps configured"'
fi

export T_NAME=$NAME T_IMAGE=$IMAGE T_CONTEXT=$CONTEXT T_WPID=$WP_REPO_ID T_TEST="$TEST_STEPS" T_DEPLOY="$DEPLOY_CMDS"
render() { # $1=template $2=dest
  python3 - "$1" "$2" <<'PYEOF'
import os, sys
src, dst = sys.argv[1], sys.argv[2]
s = open(src).read()
s = s.replace('{{NAME}}', os.environ['T_NAME'])
s = s.replace('{{IMAGE}}', os.environ['T_IMAGE'])
s = s.replace('{{CONTEXT}}', os.environ['T_CONTEXT'])
s = s.replace('{{WP_REPO_ID}}', os.environ['T_WPID'])
s = s.replace('{{TEST_STEPS}}', os.environ['T_TEST'])
s = s.replace('{{DEPLOY_CMDS}}', os.environ['T_DEPLOY'].replace('\\n', '\n').rstrip('\n'))
os.makedirs(os.path.dirname(dst), exist_ok=True)
open(dst, 'w').write(s)
PYEOF
}
log "rendering build.yml + deploy.yml"
if [ "$DRY_RUN" = 0 ]; then
  render "$TEMPLATES/build.yml.tmpl"  "$CLONE/.github/workflows/build.yml"
  render "$TEMPLATES/deploy.yml.tmpl" "$CLONE/.woodpecker/deploy.yml"
fi

# --- 6) Remove old in-cluster build pipeline + commit on Forgejo side ---
cd "$CLONE"
OLD_REMOVED=""
for f in .woodpecker.yml .woodpecker/build.yml .woodpecker/build-fallback.yml; do
  [ -f "$f" ] && { run git rm -q "$f"; OLD_REMOVED="$OLD_REMOVED $f"; }
done
run git add .github/workflows/build.yml .woodpecker/deploy.yml
if git diff --cached --quiet 2>/dev/null; then
  log "no changes to commit — SKIP (already migrated)"
else
  log "committing + pushing to forgejo master (this fires the chain)"
  run git commit -q -m "ci: move image build off-infra to GHA -> ghcr (ADR-0002)

Generated by infra/scripts/offinfra-onboard: GHA builds+tests on the
GitHub mirror, pushes ghcr.io/viktorbarzin/$IMAGE, then triggers the
Woodpecker deploy (repo $WP_REPO_ID). Old in-cluster build pipeline
removed:$OLD_REMOVED

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>"
  run git push "$FORGEJO_REMOTE" master
fi

# --- 7) GitHub default branch -> master (after mirror sync) ---
if [ "$DRY_RUN" = 0 ]; then
  for i in $(seq 1 24); do
    if gh api "repos/$GH_OWNER/$NAME/branches/master" >/dev/null 2>&1; then
      cur=$(gh api "repos/$GH_OWNER/$NAME" --jq .default_branch)
      [ "$cur" != "master" ] && gh api -X PATCH "repos/$GH_OWNER/$NAME" -F default_branch=master >/dev/null && log "default branch -> master"
      break
    fi
    sleep 5
  done
fi

log "DONE. Verify the chain:"
echo "  - GHA run:    gh run list -R $GH_OWNER/$NAME --limit 3"
echo "  - ghcr tags:  (token exchange) https://ghcr.io/v2/viktorbarzin/$IMAGE/tags/list"
echo "  - WP deploy:  $WP_API/repos/$WP_REPO_ID/pipelines"
echo "  - rollout:    kubectl -n $NAMESPACE get deploy"
echo "  - pull secret: ensure the Deployment carries ghcr-credentials (Kyverno allowlist + stack imagePullSecrets)"