class PhusionPassenger::PlatformInfo::ApacheDetector

def add_result
	result = Result.new(self)
	@results << result if yield(result)
end

def detect_all
	log "<banner>Looking for possible Apache installations...</banner>"
	apxses = PlatformInfo.find_all_commands("apxs2") +
		PlatformInfo.find_all_commands("apxs")
	apxses = remove_symlink_duplications(apxses)
	log ""
	apxses.each do |apxs2|
		detect_one(apxs2)
	end
end

def detect_one(apxs2)
	log "<banner>Analyzing #{apxs2}...</banner>"
	add_result do |result|
		result.apxs2 = apxs2
		log "Detecting main Apache executable..."
		result.httpd = PlatformInfo.httpd(:apxs2 => apxs2)
		if result.httpd
			if result.version = PlatformInfo.httpd_version(:httpd => result.httpd)
				log "Version detected: #{result.version}"
			else
				log "<red>Cannot detect version!</red>"
				result.httpd = nil
			end
		end
		if result.httpd
			log "Detecting control command..."
			result.ctl = PlatformInfo.apache2ctl(:apxs2 => apxs2)
			result.httpd = nil if !result.ctl
		end
		if result.httpd
			result.config_file = PlatformInfo.httpd_default_config_file(:httpd => result.httpd)
			if result.config_file
				log "Default config file location detected: #{result.config_file}"
			else
				log "<red>Cannot detect default config file location!</red>"
				result.httpd = nil
			end
		end
		if result.httpd
			result.error_log = PlatformInfo.httpd_actual_error_log(:httpd => result.httpd)
			if result.error_log
				log "Error log file detected: #{result.error_log}"
			else
				log "<red>Cannot detect error log file!</red>"
				result.httpd = nil
			end
		end
		if result.httpd
			if PlatformInfo.httpd_supports_a2enmod?(:httpd => result.httpd)
				log "This Apache installation does not support a2enmod."
			else
				log "Detecting a2enmod and a2dismod..."
				result.a2enmod = PlatformInfo.a2enmod(:apxs2 => apxs2)
				result.a2dismod = PlatformInfo.a2dismod(:apxs2 => apxs2)
			end
		end
		if result.httpd
			log "<green>Found a usable Apache installation using #{apxs2}.</green>"
			true
		else
			log "<yellow>Cannot find a usable Apache installation using #{apxs2}.</yellow>"
			false
		end
	end
	log ""
end

def finish
	PlatformInfo.verbose = false
	PlatformInfo.log_implementation = nil
end

def initialize(output)
	@output  = output
	@results = []
	PlatformInfo.verbose = true
	PlatformInfo.log_implementation = lambda do |message|
		if message =~ /: found$/
			log("<green> * #{message}</green>")
		else
			log(" * #{message}")
		end
	end
end

def log(message)
	if @output.tty?
		@output.puts(Utils::AnsiColors.ansi_colorize(message))
	else
		@output.puts(Utils::AnsiColors.strip_color_tags(message))
	end
end

def remove_symlink_duplications(filenames)
	old_size = filenames.size
	filenames = filenames.map do |filename|
		Pathname.new(filename).realpath
	end
	filenames.uniq!
	if old_size != filenames.size
		log "#{old_size - filenames.size} symlink duplicate(s) detected; ignoring them."
	end
	return filenames
end

def report
	log "<banner>Final autodetection results</banner>"
	@results.each do |result|
		result.report
	end
	if @results.empty?
		log "<red>Sorry, this program cannot find an Apache installation.</red>"
		log ""
		log "To install Apache, please run the following. It will tell you how to install Apache."
		log ""
		log "   <b>#{PhusionPassenger.bin_dir}/passenger-install-apache2-module</b>"
		log ""
		log "If you are sure that you have Apache installed, please read the documentation:"
		log " * <b>#{PhusionPassenger.apache2_doc_path}</b>, section"
		log "   section 'Installation' -> 'Customizing the compilation process' ->"
		log "   'Forcing location of command line tools and dependencies'"
		log " * Or visit the online version:"
		log "   <b>#{APACHE2_DOC_URL}#_forcing_location_of_command_line_tools_and_dependencies</b>"
	elsif @results.size > 1
		log "<yellow>WARNING: You have multiple Apache installations on your system!</yellow>"
		log "You are strongly recommended to read this section of the documentation:"
		log " * <b>#{PhusionPassenger.apache2_doc_path}</b>, section"
		log "   section 'Installation' -> 'Customizing the compilation process' ->"
		log "   'Forcing location of command line tools and dependencies'"
		log " * Or visit the online version:"
		log "   <b>#{APACHE2_DOC_URL}#_forcing_location_of_command_line_tools_and_dependencies</b>"
	end
end

def result_for(apxs2)
	# All the results use realpaths, so the input must too.
	apxs2 = Pathname.new(apxs2).realpath
	return @results.find { |r| r.apxs2 == apxs2 }
end