#!/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 "${BASE_REF}" HEAD 2>/dev/null)"; then
    BASE_RANGE="${BASE_COMMIT}...HEAD"
else
    BASE_RANGE="${BASE_REF}..HEAD"
fi

collect_changed_files() {
    git -C "${ROOT_DIR}" diff --name-only --diff-filter=ACDMRT "${BASE_RANGE}" 2>/dev/null || true
    git -C "${ROOT_DIR}" diff --cached --name-only --diff-filter=ACDMRT 2>/dev/null || true
    git -C "${ROOT_DIR}" diff --name-only --diff-filter=ACDMRT 2>/dev/null || true
    git -C "${ROOT_DIR}" ls-files --others --exclude-standard 2>/dev/null || true
}

is_ui_surface_path() {
    case "$1" in
        apps/platform/app/Filament/*|\
        apps/platform/resources/views/*|\
        apps/platform/app/Livewire/*|\
        apps/platform/routes/*|\
        apps/platform/app/Support/Navigation/*|\
        apps/platform/app/Providers/Filament/*)
            return 0
            ;;
    esac

    return 1
}

is_coverage_artifact_path() {
    case "$1" 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/*)
            return 0
            ;;
    esac

    return 1
}

has_checked_no_impact_with_rationale() {
    local file="$1"

    [[ -f "${ROOT_DIR}/${file}" ]] || return 1

    awk '
        BEGIN {
            window = 0
            awaiting_block = 0
            found = 0
        }

        /^- \[[xX]\] No UI surface impact[[:space:]]*$/ {
            window = 20
            awaiting_block = 0
            next
        }

        window > 0 {
            if ($0 ~ /^[[:space:]]*([*-][[:space:]]*)?(\*\*)?(No-impact[[:space:]]+rationale|Rationale)(\*\*)?[[:space:]]*:/) {
                rationale_line = $0
                sub(/^[[:space:]]*([*-][[:space:]]*)?(\*\*)?(No-impact[[:space:]]+rationale|Rationale)(\*\*)?[[:space:]]*:[[:space:]]*/, "", rationale_line)

                if (rationale_line ~ /[^[:space:]]/) {
                    found = 1
                    exit
                }

                awaiting_block = 4
                window--
                next
            }

            if (awaiting_block > 0) {
                if ($0 ~ /^[[:space:]]*$/) {
                    awaiting_block--
                    window--
                    next
                }

                if ($0 ~ /^- \[[ xX]\]/ || $0 ~ /^##/) {
                    awaiting_block = 0
                    window--
                    next
                }

                found = 1
                exit
            }

            window--
        }

        END {
            exit found ? 0 : 1
        }
    ' "${ROOT_DIR}/${file}"
}

has_checked_ui_impact() {
    local file="$1"

    [[ -f "${ROOT_DIR}/${file}" ]] || return 1

    grep -Eq '^- \[[xX]\] (Existing page changed|New page/route added|Navigation changed|Filament panel/provider surface changed|New modal/drawer/wizard/action added|New modal/drawer/wizard added|New modal/drawer/action added|New table/form/state added|Customer-facing surface changed|Dangerous action changed|Status/evidence/review presentation changed|Workspace/environment context presentation changed)[[:space:]]*$' "${ROOT_DIR}/${file}"
}

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

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

    if is_ui_surface_path "${file}"; then
        ui_changes+=("${file}")
    fi

    if is_coverage_artifact_path "${file}"; then
        coverage_changes+=("${file}")
    fi

    if [[ "${file}" == specs/*/spec.md ]]; then
        if has_checked_ui_impact "${file}"; then
            spec_impact_files+=("${file}")
        fi

        if has_checked_no_impact_with_rationale "${file}"; then
            spec_no_impact_files+=("${file}")
        fi
    fi
done < <(collect_changed_files | sort -u)

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_impact_files[@]} -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 [[ ${#spec_impact_files[@]} -gt 0 ]]; then
        echo "Checked UI impact decision found in:"
        printf '  - %s\n' "${spec_impact_files[@]}"
    fi

    if [[ ${#spec_no_impact_files[@]} -gt 0 ]]; then
        echo "Checked no-impact decision with nearby rationale found in:"
        printf '  - %s\n' "${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, no
changed spec contains a checked UI impact decision, and no changed spec
contains a checked no-impact decision with nearby rationale:

- [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), document a checked proportional UI Surface Impact decision in the
active spec, or document the checked no-impact decision with a nearby
non-empty Rationale / No-impact rationale block in the active spec.

Guarded UI surface changes:
EOF

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

exit 1