#!/usr/bin/env bash
# Conductor auto-apply: integrate a worker's patch under the declared policy.
#
# Usage: scripts/conductor-apply.sh <runId> [--dry-run]
#
# Policy (roles/conductor-policy.json in the target repo, strictly validated):
#   autoApply.enabled       master switch
#   autoApply.allowedPaths  glob allowlist ('dir/**' = everything under dir)
#   autoApply.suites        suite scripts that must pass AFTER applying
#
# Gate sequence: succeeded run record -> clean target tree -> diff extracted
# from the worker workspace -> allowlist -> syntax gates (node/bash/json) ->
# apply -> policy suites -> commit with attribution. ANY failure reverts the
# working tree and exits nonzero. Push is never automatic.
#
# Environment:
#   MOSAIC_APPLY_TARGET  repo root to apply into (default: this project)
set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
TARGET_ROOT="${MOSAIC_APPLY_TARGET:-$(cd "$SCRIPT_DIR/.." && pwd)}"
RUN_ID="${1:?usage: conductor-apply.sh <runId> [--dry-run]}"
DRY_RUN="no"
[ "${2:-}" = "--dry-run" ] && DRY_RUN="yes"

cd "$TARGET_ROOT"

fail() { echo "conductor-apply: $*" >&2; exit "${2:-1}"; }
[ -d .git ] || fail "target is not a git repository: $TARGET_ROOT" 4
[ -f roles/conductor-policy.json ] || fail "no roles/conductor-policy.json in target" 2

# ---- policy (strict) ----
POLICY_JSON="$(node -e '
const fs = require("fs");
const p = JSON.parse(fs.readFileSync("roles/conductor-policy.json", "utf8"));
if (p.policyVersion !== 1) process.exit(3);
if (!p.autoApply || typeof p.autoApply.enabled !== "boolean" || !Array.isArray(p.autoApply.allowedPaths) || !Array.isArray(p.autoApply.suites)) process.exit(3);
for (const g of p.autoApply.allowedPaths) {
  if (typeof g !== "string" || !/^[A-Za-z0-9_.*/-]+$/.test(g) || g.startsWith("/") || g.includes("..")) process.exit(3);
}
console.log(JSON.stringify(p.autoApply));
')" || fail "invalid roles/conductor-policy.json" 2

ENABLED="$(node -e 'console.log(JSON.parse(process.argv[1]).enabled)' "$POLICY_JSON")"
[ "$ENABLED" = "true" ] || fail "auto-apply is disabled by policy" 2

# ---- run record ----
DATA_ROOT="$(node scripts/mosaic-config.mjs validate | node -e 'let d="";process.stdin.on("data",c=>d+=c).on("end",()=>console.log(JSON.parse(d).dataRoot))')"
RESULT_FILE="$DATA_ROOT/runs/$RUN_ID/result.json"
[ -f "$RESULT_FILE" ] || fail "run not found: $RUN_ID" 4

node -e '
const r = JSON.parse(require("fs").readFileSync(process.argv[1], "utf8"));
process.exit(r.status === "succeeded" ? 0 : 1);
' "$RESULT_FILE" || fail "run $RUN_ID did not succeed; refusing to auto-apply"

WORKSPACE_NAME="$(node -e 'const r=JSON.parse(require("fs").readFileSync(process.argv[1],"utf8"));console.log(r.workspace||"")' "$RESULT_FILE")"
[ -n "$WORKSPACE_NAME" ] || fail "run has no workspace; nothing to integrate" 4
WORKSPACE="$DATA_ROOT/workspaces/$WORKSPACE_NAME"
[ -d "$WORKSPACE/.git" ] || fail "workspace is not a git clone: $WORKSPACE" 4

# ---- extract diff (tracked + intent-to-add) ----
git -C "$WORKSPACE" add -N . >/dev/null 2>&1 || true
DIFF_FILE="$(mktemp)"
trap 'rm -f "$DIFF_FILE"' EXIT
git -C "$WORKSPACE" diff > "$DIFF_FILE"
if [ ! -s "$DIFF_FILE" ]; then
    fail "workspace has no changes to apply"
fi

# ---- allowlist ----
mapfile -t CHANGED < <(git -C "$WORKSPACE" diff --name-only)
GLOBS="$(node -e 'const a=JSON.parse(process.argv[1]).allowedPaths;console.log(a.join("\n"))' "$POLICY_JSON")"
REFUSED=""
for f in "${CHANGED[@]}"; do
    ok="no"
    while IFS= read -r g; do
        [ -z "$g" ] && continue
        case "$f" in
            $g) ok="yes"; break ;;
        esac
    done <<< "$GLOBS"
    [ "$ok" = "yes" ] || REFUSED="$REFUSED $f"
done
if [ -n "$REFUSED" ]; then
    echo "conductor-apply: refusing - files outside policy allowlist:$REFUSED" >&2
    echo "conductor-apply: patch preserved at $DIFF_FILE for manual review" >&2
    exit 1
fi

# ---- syntax gates (on workspace files, pre-apply) ----
for f in "${CHANGED[@]}"; do
    case "$f" in
        *.mjs)  node --check "$WORKSPACE/$f" || fail "syntax gate failed (node): $f" 1 ;;
        *.sh)   bash -n "$WORKSPACE/$f" || fail "syntax gate failed (bash): $f" 1 ;;
        *.json) node -e 'JSON.parse(require("fs").readFileSync(process.argv[1],"utf8"))' "$WORKSPACE/$f" || fail "syntax gate failed (json): $f" 1 ;;
    esac
done

if [ "$DRY_RUN" = "yes" ]; then
    echo "conductor-apply (dry-run): would apply $(echo "${#CHANGED[@]}") file(s) from $RUN_ID:"
    printf '  %s\n' "${CHANGED[@]}"
    echo "conductor-apply (dry-run): suites would run: $(node -e 'console.log(JSON.parse(process.argv[1]).suites.join(", "))' "$POLICY_JSON")"
    exit 0
fi

# ---- apply ----
[ -z "$(git status --porcelain)" ] || fail "target tree is not clean; refusing to mix states"
git apply "$DIFF_FILE" || fail "git apply failed"

# ---- policy suites ----
SUITES="$(node -e 'console.log(JSON.parse(process.argv[1]).suites.join(" "))' "$POLICY_JSON")"
SUITES_OK="yes"
for s in $SUITES; do
    case "$s" in
        test-[a-z]*) : ;; # shape guard; existence checked next
        *) echo "conductor-apply: refusing suspicious suite name: $s" >&2; SUITES_OK="no"; break ;;
    esac
    [ -x "scripts/$s.sh" ] || { echo "conductor-apply: suite script missing: scripts/$s.sh" >&2; SUITES_OK="no"; break; }
    if ! bash "scripts/$s.sh" >/dev/null 2>&1; then
        echo "conductor-apply: suite failed: $s" >&2
        SUITES_OK="no"
        break
    fi
done

if [ "$SUITES_OK" != "yes" ]; then
    git apply -R "$DIFF_FILE" && echo "conductor-apply: changes REVERTED (suites failed)" >&2
    exit 1
fi

# ---- commit with attribution ----
git add -A
git commit -q -m "feat(worker): auto-applied patch from run $RUN_ID

Authored-by: pi worker (run $RUN_ID, workspace $WORKSPACE_NAME)
Applied-under: conductor-policy v1 (allowlist + syntax gates + suites)"
echo "conductor-apply: applied and committed run $RUN_ID ($(echo "${#CHANGED[@]}") file(s)); suites: $SUITES"
echo "conductor-apply: NOT pushed - push remains an explicit act."