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

script_dir=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd -P)
workspace=${WEALTH_LEDGER_WORKSPACE:-$(cd "$script_dir/../.." && pwd -P)}
source_root="$workspace/specs/agent-projection/opencode"
projection_root="$workspace/.opencode"
version_file="$workspace/specs/openspec/.cli-version"
failures=0

fail() {
  printf 'FAIL: %s\n' "$1" >&2
  failures=$((failures + 1))
}

if [[ ! -f "$version_file" ]]; then
  fail 'missing OpenSpec version contract: specs/openspec/.cli-version'
  expected_version=''
else
  expected_version=$(tr -d '[:space:]' < "$version_file")
  [[ -n "$expected_version" ]] || fail 'OpenSpec version contract is empty'
fi

for tree in commands skills; do
  source_tree="$source_root/$tree"
  projection_tree="$projection_root/$tree"
  if [[ ! -d "$source_tree" ]]; then
    fail "missing canonical projection tree: specs/agent-projection/opencode/$tree"
    continue
  fi
  if [[ ! -d "$projection_tree" ]]; then
    fail "missing projection directory: .opencode/$tree"
    continue
  fi

  while IFS= read -r source_file; do
    relative_path=${source_file#"$source_root/"}
    projection_file="$projection_root/$relative_path"
    if [[ ! -f "$projection_file" ]]; then
      fail "missing projection file: $relative_path"
    elif ! cmp -s "$source_file" "$projection_file"; then
      fail "projection content drift: $relative_path"
    fi

    if [[ "$relative_path" == skills/*/SKILL.md ]]; then
      marker_count=$(awk -v expected="generatedBy: \"$expected_version\"" '
        {
          line = $0
          sub(/^[[:space:]]*/, "", line)
          if (line == expected) count++
        }
        END { print count + 0 }
      ' "$source_file")
      if [[ "$marker_count" -ne 1 ]]; then
        fail "generated version marker mismatch in $relative_path: expected $expected_version"
      fi
    fi
  done < <(find "$source_tree" -type f | sort)

  while IFS= read -r projection_file; do
    relative_path=${projection_file#"$projection_root/"}
    if [[ ! -f "$source_root/$relative_path" ]]; then
      fail "unexpected projection file: $relative_path"
    fi
  done < <(find "$projection_tree" -type f | sort)
done

if [[ $failures -gt 0 ]]; then
  exit 1
fi

printf 'Agent projection verified against versioned authority: OpenSpec %s\n' "$expected_version"