#!/usr/bin/env bash
set -euo pipefail
source "$(dirname "$0")/../scripts/lib/common.sh"
require_cmd jq

EVID_DIR="${1:?usage: governance_constitution_pinned.sh <evidence_dir>}"
TS="$(iso_utc_now)"
FILE="$EVID_DIR/constitution_hash.json"

ROOT="$(vmcc_root)"
PIN_FILE="${VMCC_PINS_FILE:-$ROOT/config/pins.yaml}"
PINNED_SHA256="${VMCC_PINNED_CONSTITUTION_SHA256:-}"

if [[ -z "$PINNED_SHA256" && -f "$PIN_FILE" ]]; then
  PINNED_SHA256="$(awk -F': *' '/^constitution_sha256:/ {print $2}' "$PIN_FILE" | tr -d '"' | tr -d "'" | head -n 1)"
fi

if [[ ! -f "$FILE" ]]; then
  json_emit "$(jq -n --arg ts "$TS" '{
    version:"1.0.0",
    rule_id:"governance.constitution_pinned",
    control_ids:["GV-01"],
    passed:false,
    severity:"HIGH",
    timestamp:$ts,
    evidence:[{path:"constitution_hash.json"}],
    details:{error:"missing evidence file"}
  }')"
  exit 0
fi

COLLECTED="$(jq -r '.collected // false' "$FILE")"
if [[ "$COLLECTED" != "true" ]]; then
  json_emit "$(jq -n --arg ts "$TS" '{
    version:"1.0.0",
    rule_id:"governance.constitution_pinned",
    control_ids:["GV-01"],
    passed:false,
    severity:"HIGH",
    timestamp:$ts,
    evidence:[{path:"constitution_hash.json"}],
    details:{error:"constitution hash not collected"}
  }')"
  exit 0
fi

OBSERVED="$(jq -r '.sha256 // empty' "$FILE")"
if [[ -z "$PINNED_SHA256" ]]; then
  json_emit "$(jq -n --arg ts "$TS" --arg observed "$OBSERVED" '{
    version:"1.0.0",
    rule_id:"governance.constitution_pinned",
    control_ids:["GV-01"],
    passed:false,
    severity:"HIGH",
    timestamp:$ts,
    evidence:[{path:"constitution_hash.json"}],
    details:{error:"no pinned hash configured", observed_sha256:$observed}
  }')"
  exit 0
fi

if [[ "$OBSERVED" == "$PINNED_SHA256" ]]; then
  json_emit "$(jq -n --arg ts "$TS" '{
    version:"1.0.0",
    rule_id:"governance.constitution_pinned",
    control_ids:["GV-01"],
    passed:true,
    severity:"HIGH",
    timestamp:$ts,
    evidence:[{path:"constitution_hash.json"}],
    details:{}
  }')"
else
  json_emit "$(jq -n --arg ts "$TS" --arg observed "$OBSERVED" --arg pinned "$PINNED_SHA256" '{
    version:"1.0.0",
    rule_id:"governance.constitution_pinned",
    control_ids:["GV-01"],
    passed:false,
    severity:"HIGH",
    timestamp:$ts,
    evidence:[{path:"constitution_hash.json"}],
    details:{error:"hash mismatch", observed_sha256:$observed, pinned_sha256:$pinned}
  }')"
fi