# JsonDeserializer specific for Github objects.
class GithubDeserializer
	super JsonDeserializer

	private var pattern_base = "https://api.github.com"

	# Url patterns to class names
	var url_patterns: Map[Regex, String] is lazy do
		var map = new HashMap[Regex, String]
		map["{pattern_base}/users/[^/]*$".to_re] = "User"
		map["{pattern_base}/repos/[^/]*/[^/]*$".to_re] = "Repo"
		map["{pattern_base}/repos/[^/]*/[^/]*/labels/[^/]+$".to_re] = "Label"
		map["{pattern_base}/repos/[^/]*/[^/]*/milestones/[0-9]+$".to_re] = "Milestone"
		map["{pattern_base}/repos/[^/]*/[^/]*/issues/[0-9]+$".to_re] = "Issue"
		map["{pattern_base}/repos/[^/]*/[^/]*/issues/comments/[0-9]+$".to_re] = "IssueComment"
		map["{pattern_base}/repos/[^/]*/[^/]*/issues/events/[0-9]+$".to_re] = "IssueEvent"
		map["{pattern_base}/repos/[^/]*/[^/]*/pulls/[0-9]+$".to_re] = "PullRequest"
		map["{pattern_base}/repos/[^/]*/[^/]*/pulls/comments/[0-9]+$".to_re] = "PullComment"
		map["{pattern_base}/repos/[^/]*/[^/]*/comments/[0-9]+$".to_re] = "CommitComment"
		map["{pattern_base}/repos/[^/]*/[^/]*/commits/[a-f0-9]+$".to_re] = "Commit"
		map["{pattern_base}/repos/[^/]*/[^/]*/commits/[a-f0-9]+/status$".to_re] = "CommitStatus"
		map["{pattern_base}/repos/[^/]*/[^/]*/statuses/[a-f0-9]+$".to_re] = "RepoStatus"
		return map
	end

	# Match `url` property in object to a class name
	fun url_heuristic(raw: Map[String, nullable Object]): nullable String do
		if not raw.has_key("url") then return null

		var url = raw["url"].as(String)
		for re, class_name in url_patterns do
			if url.has(re) then return class_name
		end
		return null
	end

	redef fun class_name_heuristic(raw) do
		# Try with url
		var class_name = url_heuristic(raw)
		if class_name != null then return class_name

		# print raw.serialize_to_json(true, true) # debug

		# Use properties heuristics
		if raw.has_key("name") and raw.has_key("commit") then
			return "Branch"
		else if raw.has_key("total_count") and raw.has_key("items") then
			return "SearchResults"
		else if raw.has_key("total") and raw.has_key("weeks") then
			return "ContributorStats"
		else if raw.has_key("a") and raw.has_key("d") and raw.has_key("c") then
			return "ContributorWeek"
		end
		return null
	end

	redef fun deserialize_class(name) do
		if name == "Issue" then
			var issue = super.as(Issue)
			if path.last.has_key("pull_request") then
				issue.is_pull_request = true
			end
			return issue
		else if name == "Commit" then
			var commit = super.as(Commit)
			var git_commit = commit.commit
			if git_commit != null then commit.message = git_commit.message
			return commit
		end
		return super
	end
end