#!/usr/bin/env bash
set -euo pipefail

if [[ $# -ne 1 ]]; then
  printf 'Usage: %s <change-name>\n' "${0##*/}" >&2
  exit 2
fi

change=$1
if [[ ! "$change" =~ ^[a-z0-9]+(-[a-z0-9]+)*$ ]]; then
  printf 'Invalid OpenSpec change name: %s\n' "$change" >&2
  exit 2
fi

script_dir=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd -P)
workspace=$(cd "$script_dir/../.." && pwd -P)
change_dir="$workspace/specs/openspec/changes/$change"
metadata_file="$change_dir/.openspec.yaml"
design_file="$change_dir/design.md"

for required_file in "$metadata_file" "$design_file"; do
  if [[ ! -f "$required_file" ]]; then
    printf 'Missing canonical change input: %s\n' "${required_file#$workspace/}" >&2
    exit 1
  fi
done

areas=(frontend backend specs docs)
affected_flags=(0 0 0 0)
map_statuses=('' '' '' '')
map_reasons=('' '' '' '')
contract_status=''
contract_reason=''

area_index() {
  case "$1" in
    frontend) printf '0' ;;
    backend) printf '1' ;;
    specs) printf '2' ;;
    docs) printf '3' ;;
    *) return 1 ;;
  esac
}

while IFS= read -r area; do
  [[ -n "$area" ]] || continue
  if ! index=$(area_index "$area"); then
    printf 'Unknown affected area in %s: %s\n' "${metadata_file#$workspace/}" "$area" >&2
    exit 1
  fi
  if [[ "${affected_flags[$index]}" -eq 1 ]]; then
    printf 'Duplicate affected area in %s: %s\n' "${metadata_file#$workspace/}" "$area" >&2
    exit 1
  fi
  affected_flags[$index]=1
done < <(
  awk '
    $0 == "affected_areas:" { in_areas = 1; next }
    in_areas && /^  - / { sub(/^  - /, ""); print; next }
    in_areas { exit }
  ' "$metadata_file"
)

if [[ "${affected_flags[2]}" -ne 1 ]]; then
  printf 'Delivery Map violation: specs must be affected for every versioned change.\n' >&2
  exit 1
fi

trim() {
  local value=$1
  value=${value#"${value%%[![:space:]]*}"}
  value=${value%"${value##*[![:space:]]}"}
  printf '%s' "$value"
}

while IFS='|' read -r _ raw_area raw_status raw_reason _; do
  area=$(trim "$raw_area")
  case "$area" in
    frontend|backend|specs|docs) ;;
    *) continue ;;
  esac
  index=$(area_index "$area")

  if [[ -n "${map_statuses[$index]}" ]]; then
    printf 'Delivery Map contains duplicate row for %s.\n' "$area" >&2
    exit 1
  fi

  status=$(trim "$raw_status")
  status=${status//\`/}
  reason=$(trim "$raw_reason")
  map_statuses[$index]=$status
  map_reasons[$index]=$reason
done < "$design_file"

while IFS='|' read -r _ raw_gate raw_status raw_reason _; do
  gate=$(trim "$raw_gate")
  [[ "$gate" == "runtime-openapi" ]] || continue
  if [[ -n "$contract_status" ]]; then
    printf 'Contract Gate Decision contains duplicate runtime-openapi row.\n' >&2
    exit 1
  fi
  contract_status=$(trim "$raw_status")
  contract_status=${contract_status//\`/}
  contract_reason=$(trim "$raw_reason")
done < "$design_file"

for index in 0 1 2 3; do
  area=${areas[$index]}
  status=${map_statuses[$index]}
  reason=${map_reasons[$index]}
  if [[ -z "$status" ]]; then
    printf 'Delivery Map is missing area: %s\n' "$area" >&2
    exit 1
  fi

  if [[ "${affected_flags[$index]}" -eq 1 ]]; then
    if [[ "$status" != "affected" ]]; then
      printf 'Delivery Map mismatch: %s is listed as affected in metadata but has status %s.\n' "$area" "$status" >&2
      exit 1
    fi
    if [[ -z "$reason" || "$reason" == "-" || "$reason" == "—" || "$reason" == *"<!--"* ]]; then
      printf 'Delivery Map requires an architectural outcome for affected area %s.\n' "$area" >&2
      exit 1
    fi
  else
    if [[ "$status" != "N/A" ]]; then
      printf 'Delivery Map mismatch: %s is absent from affected_areas but has status %s.\n' "$area" "$status" >&2
      exit 1
    fi
    if [[ -z "$reason" || "$reason" == "-" || "$reason" == "—" || "$reason" == *"<!--"* ]]; then
      printf 'Delivery Map requires a concrete N/A reason for %s.\n' "$area" >&2
      exit 1
    fi
  fi
done

if [[ -z "$contract_status" ]]; then
  printf 'Contract Gate Decision is missing runtime-openapi.\n' >&2
  exit 1
fi
if [[ "$contract_status" != "required" && "$contract_status" != "N/A" ]]; then
  printf 'Invalid runtime-openapi decision: %s. Expected required or N/A.\n' "$contract_status" >&2
  exit 1
fi
if [[ -z "$contract_reason" || "$contract_reason" == "-" || "$contract_reason" == "—" || "$contract_reason" == *"<!--"* ]]; then
  printf 'Contract Gate Decision requires a concrete runtime-openapi reason.\n' >&2
  exit 1
fi
if [[ "$contract_status" == "required" ]]; then
  if [[ "${affected_flags[0]}" -ne 1 || "${affected_flags[1]}" -ne 1 ]]; then
    printf 'runtime-openapi cannot be required unless frontend and backend are affected.\n' >&2
    exit 1
  fi
fi

printf 'Delivery Map verified:'
for index in 0 1 2 3; do
  printf ' %s=%s' "${areas[$index]}" "${map_statuses[$index]}"
done
printf '\n'
printf 'Contract Gate Decision verified: runtime-openapi=%s\n' "$contract_status"

run_gate() {
  local label=$1
  shift
  printf '\n==> %s\n' "$label"
  "$@"
}

run_gate 'OpenSpec CLI contract' bash "$workspace/specs/scripts/verify-openspec-version.sh"
run_gate 'OpenSpec project schema' bash -c 'cd "$1" && openspec schema validate wealth-ledger-sdd' _ "$workspace/specs"
run_gate 'OpenSpec change validation' bash -c 'cd "$1" && openspec validate "$2" --type change --strict --store wealth-ledger-specs' _ "$workspace/specs" "$change"
run_gate 'OpenSpec main specs' bash -c 'cd "$1" && openspec validate --specs --strict --store wealth-ledger-specs' _ "$workspace/specs"
run_gate 'OpenSpec authority' bash "$workspace/specs/scripts/verify-openspec-authority.sh"

if [[ "${affected_flags[0]}" -eq 1 ]]; then
  run_gate 'Frontend canonical verification' npm --prefix "$workspace/frontend" run verify
fi

if [[ "${affected_flags[1]}" -eq 1 ]]; then
  run_gate 'Backend canonical verification' npm --prefix "$workspace/backend" run verify
fi

if [[ "${affected_flags[3]}" -eq 1 ]]; then
  run_gate 'Docs canonical verification' npm --prefix "$workspace/docs" run verify
fi

if [[ "$contract_status" == "required" ]]; then
  run_gate 'Runtime OpenAPI contract' bash "$workspace/specs/scripts/verify-runtime-openapi.sh"
fi

printf '\nWorkspace verification passed for %s.\n' "$change"