#!/usr/bin/env bash

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
ROOT_DIR="$(cd "${SCRIPT_DIR}/.." && pwd)"
BASE_REF="${1:-${GITHUB_BASE_REF:-${GITEA_BASE_REF:-}}}"

if [[ -z "${BASE_REF}" ]]; then
    if git -C "${ROOT_DIR}" rev-parse --verify origin/dev >/dev/null 2>&1; then
        BASE_REF="origin/dev"
    elif git -C "${ROOT_DIR}" rev-parse --verify HEAD~1 >/dev/null 2>&1; then
        BASE_REF="HEAD~1"
    else
        echo "UI/Productization Coverage guard: no base ref supplied and no fallback ref exists." >&2
        echo "Usage: scripts/check-ui-productization-coverage <base-ref>" >&2
        exit 2
    fi
fi

if ! git -C "${ROOT_DIR}" rev-parse --verify "${BASE_REF}^{commit}" >/dev/null 2>&1; then
    echo "UI/Productization Coverage guard: base ref '${BASE_REF}' is not available." >&2
    echo "Fetch the target branch first or pass an available commit/ref." >&2
    exit 2
fi

if BASE_COMMIT="$(git -C "${ROOT_DIR}" merge-base "${BASE_REF}" HEAD 2>/dev/null)"; then
    CHANGED_FILES="$(git -C "${ROOT_DIR}" diff --name-only --diff-filter=ACMRT "${BASE_COMMIT}...HEAD")"
else
    CHANGED_FILES="$(git -C "${ROOT_DIR}" diff --name-only --diff-filter=ACMRT "${BASE_REF}..HEAD")"
fi

ui_changes=()
coverage_changes=()
spec_no_impact_files=()

while IFS= read -r file; do
    [[ -z "${file}" ]] && continue

    case "${file}" in
        apps/platform/app/Filament/*|apps/platform/app/Support/Navigation/*|apps/platform/app/Providers/Filament/*|apps/platform/resources/views/*|apps/platform/app/Livewire/*|apps/platform/routes/*)
            ui_changes+=("${file}")
            ;;
    esac

    case "${file}" in
        docs/ui-ux-enterprise-audit/route-inventory.md|\
        docs/ui-ux-enterprise-audit/design-coverage-matrix.md|\
        docs/ui-ux-enterprise-audit/grouped-follow-up-candidates.md|\
        docs/ui-ux-enterprise-audit/strategic-surfaces.md|\
        docs/ui-ux-enterprise-audit/unresolved-pages.md|\
        docs/ui-ux-enterprise-audit/page-reports/*)
            coverage_changes+=("${file}")
            ;;
    esac

    if [[ "${file}" == specs/*/spec.md && -f "${ROOT_DIR}/${file}" ]] \
        && grep -Eq '^- \[[xX]\] No UI surface impact[[:space:]]*$' "${ROOT_DIR}/${file}"; then
        spec_no_impact_files+=("${file}")
    fi
done <<< "${CHANGED_FILES}"

if [[ ${#ui_changes[@]} -eq 0 ]]; then
    echo "UI/Productization Coverage guard passed: no guarded UI surface paths changed."
    exit 0
fi

if [[ ${#coverage_changes[@]} -gt 0 || ${#spec_no_impact_files[@]} -gt 0 ]]; then
    echo "UI/Productization Coverage guard passed."
    echo "Guarded UI surface changes:"
    printf '  - %s\n' "${ui_changes[@]}"

    if [[ ${#coverage_changes[@]} -gt 0 ]]; then
        echo "Coverage artifacts changed:"
        printf '  - %s\n' "${coverage_changes[@]}"
    fi

    if [[ ${#spec_no_impact_files[@]} -gt 0 ]]; then
        echo "No-impact decision found in:"
        printf '  - %s\n' "${spec_no_impact_files[@]}"
    fi

    exit 0
fi

cat >&2 <<'EOF'
UI/Productization Coverage guard failed.

Guarded UI surface files changed, but no UI coverage artifact changed and no
active spec contains:

- [x] No UI surface impact

Required: update at least one relevant artifact under
docs/ui-ux-enterprise-audit/ (route inventory, design coverage matrix, page
reports, grouped follow-up candidates, strategic surfaces, or unresolved
pages), or document the checked no-impact decision in the active spec.

Guarded UI surface changes:
EOF

printf '  - %s\n' "${ui_changes[@]}" >&2

exit 1