#!/usr/bin/env bash
#
# Migrate all docs/*.md (repo root) to Gitea wiki as pages.
# Mapping: docs/FILE.md → page "File" (stem with _ → -, first letter upper per segment).
# Requires GITEA_TOKEN or .secrets/gitea-issues/token.
# Usage: ./wiki-migrate-docs.sh [--dry-run] [file.md ...]
#   --dry-run: print mapping and skip API calls.
#   If file(s) given: migrate only those; else migrate all docs/*.md.
#
set -euo pipefail

GITEA_ISSUES_DIR="${GITEA_ISSUES_DIR:-$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)}"
REPO_ROOT="${GITEA_ISSUES_DIR}/.."
DOCS_DIR="${REPO_ROOT}/docs"
# shellcheck source=lib.sh
source "${GITEA_ISSUES_DIR}/lib.sh"

REPO_PATH="/repos/${GITEA_REPO_OWNER}/${GITEA_REPO_NAME}"
GITEA_WIKI_REF="${GITEA_WIKI_REF:-master}"
WIKI_PAGE="${REPO_PATH}/wiki/page"
WIKI_NEW="${REPO_PATH}/wiki/new"

# docs/FILE.md → page name for wiki (stem: _ → -, title-case: First-Letter-Of-Each-Segment)
file_to_page_name() {
	local base="$1"
	local stem="${base%.md}"
	echo "$stem" | tr '_' '-' | awk -F- '{
		for(i=1;i<=NF;i++) {
			s = $i; l = length(s)
			if (l > 0) $i = toupper(substr(s,1,1)) tolower(substr(s,2))
		}
	}1' OFS='-'
}

dry_run=false
files=()
while [[ $# -gt 0 ]]; do
	case "$1" in
		--dry-run) dry_run=true; shift ;;
		*.md) files+=("$1"); shift ;;
		*) log_err "Unknown option or not .md: $1"; exit 1 ;;
	esac
done

if [[ ${#files[@]} -eq 0 ]]; then
	while IFS= read -r -d '' f; do
		files+=("$f")
	done < <(find "$DOCS_DIR" -maxdepth 1 -name '*.md' -print0 | sort -z)
else
	# Resolve args to full paths under DOCS_DIR
	for i in "${!files[@]}"; do
		u="${files[$i]}"
		if [[ "$u" != */* ]] && [[ -f "${DOCS_DIR}/${u}" ]]; then
			files[$i]="${DOCS_DIR}/${u}"
		fi
	done
fi

if [[ ${#files[@]} -eq 0 ]]; then
	log_err "No .md files found in ${DOCS_DIR}"
	exit 1
fi

if [[ "$dry_run" == true ]]; then
	log_info "Dry run: would migrate ${#files[@]} file(s)"
	for f in "${files[@]}"; do
		base="$(basename "$f")"
		page="$(file_to_page_name "$base")"
		echo "  $f → $page"
	done
	exit 0
fi

load_gitea_token || exit 1
require_jq || exit 1

for f in "${files[@]}"; do
	base="$(basename "$f")"
	page="$(file_to_page_name "$base")"
	if [[ ! -f "$f" ]]; then
		log_err "Skip (not a file): $f"
		continue
	fi
	content="$(cat "$f")"
	content_b64="$(echo -n "$content" | base64 -w 0)"
	body="$(jq -n --arg title "$page" --arg content "$content_b64" --arg msg "Migrate from docs/$base" \
		'{ title: $title, content_base64: $content, message: $msg }')"
	# Check if page exists (GET); if 200 use PATCH else POST
	resp="$(gitea_api_get "${REPO_PATH}/wiki/page/${page}?ref=${GITEA_WIKI_REF}")"
	if echo "$resp" | jq -e .title &>/dev/null; then
		log_info "Update: $base → $page"
		patch_body="$(jq -n --arg content "$content_b64" --arg msg "Update from docs/$base" '{ content_base64: $content, message: $msg }')"
		gitea_api_patch "${WIKI_PAGE}/${page}?ref=${GITEA_WIKI_REF}" "$patch_body" >/dev/null || true
	else
		log_info "Create: $base → $page"
		gitea_api_post "${WIKI_NEW}" "$body" >/dev/null || true
	fi
done

log_info "Migration done: ${#files[@]} file(s)."