require "dotenv"
require "base64"
require "fileutils"
require "json"
require "net/http"
require "open3"
require "openssl"
require "securerandom"
require "shellwords"
require "uri"
require "yaml"

Dotenv.load(File.expand_path("../.env", __dir__))

default_platform(:ios)

APP_IDENTIFIER = ENV.fetch("FASTLANE_APP_IDENTIFIER", "net.buzzert.sybil2")
TEAM_ID = ENV.fetch("FASTLANE_TEAM_ID", "DQQH5H6GBD")
APP_STORE_APPLE_ID = ENV.fetch("SYBIL_APP_STORE_APPLE_ID", "6759442828")
PROVIDER_PUBLIC_ID = ENV.fetch("SYBIL_PROVIDER_PUBLIC_ID", "c043d167-ad88-4036-84ea-76c223f1b1b2")
PROFILE_SPECIFIER = ENV["SYBIL_PROVISIONING_PROFILE_SPECIFIER"].to_s.strip.empty? ? "Sybil AppStore CI" : ENV["SYBIL_PROVISIONING_PROFILE_SPECIFIER"]
SIGNING_CERTIFICATE_NAME = ENV["SYBIL_CODE_SIGN_IDENTITY"].to_s.strip.empty? ? "Apple Distribution: James Magahern (DQQH5H6GBD)" : ENV["SYBIL_CODE_SIGN_IDENTITY"]
IOS_ROOT = File.expand_path("..", __dir__)
PROJECT_FILE = File.join(IOS_ROOT, "Sybil.xcodeproj")
PROJECT_SPEC = File.join(IOS_ROOT, "project.yml")
APP_SPEC = File.join(IOS_ROOT, "Apps/Sybil/project.yml")
SIGNING_OUTPUT_DIR = File.join(IOS_ROOT, "build/signing")
SCHEME = "Sybil"
TARGET = "SybilApp"

def present?(value)
  !value.to_s.strip.empty?
end

def capture(command)
  stdout, stderr, status = Open3.capture3(command)
  return stdout.strip if status.success?

  UI.user_error!("Command failed: #{command}\n#{stderr.strip}")
end

def run_silent(*command, error_message:)
  _stdout, stderr, status = Open3.capture3(*command)
  return if status.success?

  UI.user_error!("#{error_message}\n#{stderr.strip}")
end

def user_keychains
  capture("security list-keychains -d user").lines.map { |line| line.strip.delete('"') }.reject(&:empty?)
end

def app_project_settings
  YAML.safe_load(File.read(APP_SPEC)).fetch("targets").fetch(TARGET).fetch("settings").fetch("base")
end

def local_marketing_version
  app_project_settings.fetch("MARKETING_VERSION").to_s
end

def local_build_number
  app_project_settings.fetch("CURRENT_PROJECT_VERSION").to_i
end

def normalize_version_tag(tag)
  version = tag.to_s.strip.sub(%r{\Arelease/}, "").sub(/\Av/, "")
  unless version.match?(/\A\d+\.\d+\.\d+\z/)
    UI.user_error!("Release tag #{tag.inspect} must look like release/v1.10.0")
  end
  version
end

def release_version
  tag = ENV["SYBIL_VERSION_TAG"]
  tag = capture("git describe --tags --abbrev=0") unless present?(tag)
  normalize_version_tag(tag)
end

def xcode_build_setting(key, value)
  "#{key}=#{value.to_s.shellescape}"
end

def env_line(key, value)
  "#{key}=#{value.to_s.shellescape}"
end

def base64url(value)
  Base64.urlsafe_encode64(value).delete("=")
end

def integer_to_fixed_bytes(integer, length)
  hex = integer.to_s(16)
  hex = "0#{hex}" if hex.length.odd?
  [hex].pack("H*").rjust(length, "\0")[-length, length]
end

def app_store_connect_private_key
  key_path = ENV["APP_STORE_CONNECT_API_KEY_PATH"]
  key_content = ENV["APP_STORE_CONNECT_API_KEY_CONTENT"]

  pem = if present?(key_path)
          File.read(key_path)
        elsif present?(key_content)
          ENV["APP_STORE_CONNECT_API_KEY_CONTENT_BASE64"].to_s == "true" ? Base64.decode64(key_content) : key_content
        end
  UI.user_error!("App Store Connect API key content is required") unless present?(pem)

  OpenSSL::PKey::EC.new(pem)
end

def app_store_connect_jwt
  key_id = ENV["APP_STORE_CONNECT_API_KEY_ID"]
  issuer_id = ENV["APP_STORE_CONNECT_API_ISSUER_ID"]
  issuer_id = ENV["APP_STORE_CONNECT_API_KEY_ISSUER_ID"] unless present?(issuer_id)
  UI.user_error!("App Store Connect API key id and issuer id are required") unless present?(key_id) && present?(issuer_id)

  header = { alg: "ES256", kid: key_id, typ: "JWT" }
  payload = { iss: issuer_id, iat: Time.now.to_i, exp: Time.now.to_i + 600, aud: "appstoreconnect-v1" }
  unsigned = [base64url(header.to_json), base64url(payload.to_json)].join(".")
  asn1_signature = app_store_connect_private_key.dsa_sign_asn1(OpenSSL::Digest::SHA256.digest(unsigned))
  signature_sequence = OpenSSL::ASN1.decode(asn1_signature)
  raw_signature = signature_sequence.value.map { |part| integer_to_fixed_bytes(part.value, 32) }.join
  [unsigned, base64url(raw_signature)].join(".")
end

def app_store_connect_request(method, path, payload = nil)
  uri = URI("https://api.appstoreconnect.apple.com#{path}")
  request_class = Net::HTTP.const_get(method.to_s.capitalize)
  request = request_class.new(uri)
  request["Authorization"] = "Bearer #{app_store_connect_jwt}"
  if payload
    request["Content-Type"] = "application/json"
    request.body = payload.to_json
  end

  response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) { |http| http.request(request) }
  return {} if response.is_a?(Net::HTTPSuccess) && response.body.to_s.empty?
  return JSON.parse(response.body) if response.is_a?(Net::HTTPSuccess)

  UI.user_error!("App Store Connect API request failed: #{method.to_s.upcase} #{path}\n#{response.body}")
end

def bundle_id_resource_id
  response = app_store_connect_request(
    :get,
    "/v1/bundleIds?filter[identifier]=#{URI.encode_www_form_component(APP_IDENTIFIER)}&limit=1"
  )
  id = response.fetch("data", []).first&.fetch("id", nil)
  UI.user_error!("Could not find App Store Connect bundle id resource for #{APP_IDENTIFIER}") unless present?(id)
  id
end

def recreate_app_store_profile(certificate_id)
  existing = app_store_connect_request(
    :get,
    "/v1/profiles?filter[name]=#{URI.encode_www_form_component(PROFILE_SPECIFIER)}&limit=200"
  )
  existing.fetch("data", []).each do |profile|
    app_store_connect_request(:delete, "/v1/profiles/#{profile.fetch("id")}")
  end

  payload = {
    data: {
      type: "profiles",
      attributes: {
        name: PROFILE_SPECIFIER,
        profileType: "IOS_APP_STORE"
      },
      relationships: {
        bundleId: {
          data: { type: "bundleIds", id: bundle_id_resource_id }
        },
        certificates: {
          data: [{ type: "certificates", id: certificate_id }]
        }
      }
    }
  }
  response = app_store_connect_request(:post, "/v1/profiles", payload)
  profile_content = response.dig("data", "attributes", "profileContent")
  UI.user_error!("App Store Connect profile response did not include profileContent") unless present?(profile_content)

  profile_path = File.join(SIGNING_OUTPUT_DIR, "Sybil_AppStore_CI.mobileprovision")
  File.binwrite(profile_path, Base64.decode64(profile_content))
  install_dir = File.expand_path("~/Library/MobileDevice/Provisioning Profiles")
  FileUtils.mkdir_p(install_dir)
  FileUtils.cp(profile_path, File.join(install_dir, "Sybil_AppStore_CI.mobileprovision"))
  profile_path
end

def app_store_connect_key_options
  key_id = ENV["APP_STORE_CONNECT_API_KEY_ID"]
  issuer_id = ENV["APP_STORE_CONNECT_API_ISSUER_ID"]
  issuer_id = ENV["APP_STORE_CONNECT_API_KEY_ISSUER_ID"] unless present?(issuer_id)
  return nil unless present?(key_id) && present?(issuer_id)

  key_path = ENV["APP_STORE_CONNECT_API_KEY_PATH"]
  key_content = ENV["APP_STORE_CONNECT_API_KEY_CONTENT"]
  if present?(key_path)
    {
      key_id: key_id,
      issuer_id: issuer_id,
      key_filepath: key_path
    }
  elsif present?(key_content)
    {
      key_id: key_id,
      issuer_id: issuer_id,
      key_content: key_content,
      is_key_content_base64: ENV["APP_STORE_CONNECT_API_KEY_CONTENT_BASE64"].to_s == "true"
    }
  end
end

platform :ios do
  private_lane :load_app_store_connect_api_key do
    options = app_store_connect_key_options
    UI.user_error!("App Store Connect API key is required") unless options

    app_store_connect_api_key(options)
  end

  desc "Show the version Fastlane will stamp into the next TestFlight archive"
  lane :version do
    UI.message("Git tag version: #{release_version}")
    UI.message("Checked-in app version: #{local_marketing_version}")
    UI.message("Checked-in build number: #{local_build_number}")
  end

  desc "Create CI signing certificate/profile and write ignored secret material under build/signing"
  lane :create_ci_signing do
    api_key = load_app_store_connect_api_key

    FileUtils.rm_rf(SIGNING_OUTPUT_DIR)
    FileUtils.mkdir_p(SIGNING_OUTPUT_DIR)

    cert_id = ENV["SYBIL_SIGNING_CERTIFICATE_ID"].to_s
    keychain_path = nil
    keychain_password = nil
    p12_path = File.join(SIGNING_OUTPUT_DIR, "appstore-signing.p12")
    p12_password = ENV["SYBIL_CI_P12_PASSWORD"].to_s
    if p12_password.empty?
      p12_password = SecureRandom.base64(24)
      UI.important("Generated a p12 password for CI secrets.")
    end

    begin
      if present?(cert_id)
        UI.message("Using existing signing certificate id #{cert_id}")
        export_keychain = ENV["SYBIL_SIGNING_KEYCHAIN"].to_s
        export_keychain = File.expand_path("~/Library/Keychains/login.keychain-db") unless present?(export_keychain)
        run_silent(
          "security", "export", "-k", export_keychain, "-t", "identities", "-f", "pkcs12", "-P", p12_password, "-o", p12_path,
          error_message: "Could not export the local CI signing identity"
        )
      else
        keychain_path = File.join(SIGNING_OUTPUT_DIR, "sybil_ci_signing.keychain-db")
        keychain_password = SecureRandom.base64(24)
        run_silent(
          "security", "create-keychain", "-p", keychain_password, keychain_path,
          error_message: "Could not create temporary signing keychain"
        )
        run_silent(
          "security", "set-keychain-settings", "-lut", "21600", keychain_path,
          error_message: "Could not configure temporary signing keychain"
        )
        run_silent(
          "security", "unlock-keychain", "-p", keychain_password, keychain_path,
          error_message: "Could not unlock temporary signing keychain"
        )
        run_silent(
          "security", "list-keychains", "-d", "user", "-s", keychain_path, *user_keychains,
          error_message: "Could not add temporary signing keychain to the user search list"
        )

        cert(
          api_key: api_key,
          development: false,
          force: true,
          generate_apple_certs: true,
          keychain_password: keychain_password,
          keychain_path: keychain_path,
          output_path: SIGNING_OUTPUT_DIR,
          platform: "ios"
        )

        cert_id = lane_context[SharedValues::CERT_CERTIFICATE_ID]
        UI.user_error!("Could not resolve generated certificate id") unless present?(cert_id)
        run_silent(
          "security", "export", "-k", keychain_path, "-t", "identities", "-f", "pkcs12", "-P", p12_password, "-o", p12_path,
          error_message: "Could not export the generated CI signing identity"
        )
      end

      UI.user_error!("Could not find exported p12 at #{p12_path}") unless File.exist?(p12_path)

      profile_path = recreate_app_store_profile(cert_id)
      UI.user_error!("Could not resolve generated provisioning profile path") unless present?(profile_path) && File.exist?(profile_path)

      secrets_path = File.join(SIGNING_OUTPUT_DIR, "ci-secrets.env")
      File.write(
        secrets_path,
        [
          env_line("APPSTORE_CERTIFICATES_FILE_BASE64", Base64.strict_encode64(File.binread(p12_path))),
          env_line("APPSTORE_CERTIFICATES_PASSWORD", p12_password),
          env_line("APPSTORE_PROVISIONING_PROFILE_BASE64", Base64.strict_encode64(File.binread(profile_path))),
          env_line("SYBIL_PROVISIONING_PROFILE_SPECIFIER", PROFILE_SPECIFIER)
        ].join("\n") + "\n"
      )
    ensure
      system("security", "delete-keychain", keychain_path, out: File::NULL, err: File::NULL) if present?(keychain_path) && File.exist?(keychain_path)
    end

    UI.success("Created CI signing files in #{SIGNING_OUTPUT_DIR}")
    UI.important("Add the values from #{secrets_path} as repository secrets.")
  end

  desc "Build Sybil and upload it to TestFlight"
  lane :beta do
    version = release_version
    build_number = ENV["SYBIL_BUILD_NUMBER"].to_s
    api_key = load_app_store_connect_api_key

    unless present?(build_number)
      build_number = (local_build_number + 1).to_s

      begin
        latest = latest_testflight_build_number(
          app_identifier: APP_IDENTIFIER,
          version: version,
          api_key: api_key,
          initial_build_number: local_build_number
        ).to_i
        build_number = [latest + 1, local_build_number + 1].max.to_s
      rescue StandardError => e
        UI.important("Could not look up TestFlight build number: #{e.message}")
        UI.important("Using checked-in build number + 1: #{build_number}")
      end
    end

    UI.user_error!("Build number must be a positive integer") unless build_number.match?(/\A[1-9]\d*\z/)

    sh("xcodegen --spec #{PROJECT_SPEC.shellescape}")

    xcode_args = [
      xcode_build_setting("MARKETING_VERSION", version),
      xcode_build_setting("CURRENT_PROJECT_VERSION", build_number),
      xcode_build_setting("CODE_SIGN_STYLE", "Manual"),
      xcode_build_setting("DEVELOPMENT_TEAM", TEAM_ID),
      xcode_build_setting("PROVISIONING_PROFILE_SPECIFIER", PROFILE_SPECIFIER),
      xcode_build_setting("CODE_SIGN_IDENTITY", SIGNING_CERTIFICATE_NAME)
    ]
    if present?(ENV["SYBIL_SIGNING_KEYCHAIN_PATH"])
      xcode_args << xcode_build_setting("OTHER_CODE_SIGN_FLAGS", "--keychain #{ENV.fetch("SYBIL_SIGNING_KEYCHAIN_PATH")}")
    end
    xcode_args = xcode_args.join(" ")

    ipa_path = build_app(
      project: PROJECT_FILE,
      scheme: SCHEME,
      clean: true,
      sdk: "iphoneos",
      export_method: "app-store",
      output_directory: File.join(IOS_ROOT, "build/fastlane"),
      output_name: "Sybil-#{version}-#{build_number}.ipa",
      xcargs: xcode_args,
      export_options: {
        method: "app-store",
        destination: "export",
        signingStyle: "manual",
        provisioningProfiles: {
          APP_IDENTIFIER => PROFILE_SPECIFIER
        },
        signingCertificate: SIGNING_CERTIFICATE_NAME,
        teamID: TEAM_ID,
        manageAppVersionAndBuildNumber: false,
        uploadSymbols: true,
        stripSwiftSymbols: true
      }
    )

    ipa_path ||= lane_context[SharedValues::IPA_OUTPUT_PATH]
    UI.user_error!("IPA export failed; no IPA path was returned") unless present?(ipa_path) && File.exist?(ipa_path)

    upload_to_testflight(
      api_key: api_key,
      app_identifier: APP_IDENTIFIER,
      ipa: ipa_path,
      skip_waiting_for_build_processing: true
    )
  end
end