;;; packages.el --- Java functions File for Spacemacs
;;
;; Copyright (c) 2012-2018 Sylvain Benner & Contributors
;;
;; Author: Lukasz Klich <klich.lukasz@gmail.com>
;; URL: https://github.com/syl20bnr/spacemacs
;;
;; This file is not part of GNU Emacs.
;;
;;; License: GPLv3

(defun spacemacs//java-define-command-prefixes ()
  "Define command prefixes for java-mode."
  (setq java/key-binding-prefixes '(("md" . "eclimd")
                                    ("mE" . "errors")
                                    ("mf" . "find")
                                    ("mg" . "goto")
                                    ("mr" . "refactor")
                                    ("mh" . "documentation")
                                    ("ma" . "ant")
                                    ("mp" . "project")
                                    ("mt" . "test")))
  (mapc (lambda(x) (spacemacs/declare-prefix-for-mode
                    'java-mode (car x) (cdr x)))
        java/key-binding-prefixes))

(defun spacemacs//java-setup-backend ()
  "Conditionally setup java backend."
  (pcase java-backend
    (`meghanada (spacemacs//java-setup-meghanada))
    (`eclim (spacemacs//java-setup-eclim))
    (`ensime (spacemacs//java-setup-ensime))))

(defun spacemacs//java-setup-company ()
  "Conditionally setup company based on backend."
  (pcase java-backend
    (`meghanada (spacemacs//java-setup-meghanada-company))
    (`eclim (spacemacs//java-setup-eclim-company))
    (`ensime (spacemacs//java-setup-ensime-company))))

(defun spacemacs//java-setup-flycheck ()
  "Conditionally setup flycheck based on backend."
  (pcase java-backend
    (`meghanada (spacemacs//java-setup-meghanada-flycheck))
    (`eclim (spacemacs//java-setup-eclim-flycheck))
    (`ensime (spacemacs//java-setup-ensime-flycheck))))

(defun spacemacs//java-setup-flyspell ()
  "Conditionally setup flyspell based on backend."
  (pcase java-backend
    (`ensime (spacemacs//java-setup-ensime-flyspell))))

(defun spacemacs//java-setup-eldoc ()
  "Conditionally setup eldoc based on backend."
  (pcase java-backend
    ;; meghanada setup eldoc on its own
    (`ensime (spacemacs//java-setup-ensime-eldoc))))



;; ensime

(autoload 'ensime-config-find-file "ensime-config")
(autoload 'ensime-config-find "ensime-config")
(autoload 'projectile-project-p "projectile")

(defun spacemacs//java-setup-ensime ()
  "Setup ENSIME."
  ;; jump handler
  (add-to-list 'spacemacs-jump-handlers-java-mode 'ensime-edit-definition)
  ;; ensure the file exists before starting `ensime-mode'
  (cond
   ((and (buffer-file-name) (file-exists-p (buffer-file-name)))
    (ensime-mode))
   ((buffer-file-name)
    (add-hook 'after-save-hook 'ensime-mode nil t))))

(defun spacemacs//java-setup-ensime-company ()
  "Setup ENSIME auto-completion.")

(defun spacemacs//java-setup-ensime-flycheck ()
  "Setup ENSIME syntax checking.")

(defun spacemacs//java-setup-ensime-flyspell ()
  "Setup ENSIME spell checking."
  (flyspell-mode)
  (setq-local flyspell-generic-check-word-predicate
              'spacemacs//ensime-flyspell-verify))

(defun spacemacs//java-setup-ensime-eldoc ()
  "Setup ENSIME eldoc."
  (setq-local eldoc-documentation-function
              (lambda ()
                (when (ensime-connected-p)
                  (ensime-type-at-point))))
  (eldoc-mode))

(defun spacemacs//ensime-maybe-start ()
  (when (buffer-file-name)
    (let ((ensime-buffer (spacemacs//ensime-buffer-for-file (buffer-file-name)))
          (file (ensime-config-find-file (buffer-file-name)))
          (is-source-file (s-matches? (rx (or "/src/" "/test/"))
                                      (buffer-file-name))))

      (when (and is-source-file (null ensime-buffer))
        (noflet ((ensime-config-find (&rest _) file))
          (save-window-excursion
            (ensime)))))))

(defun spacemacs//ensime-buffer-for-file (file)
  "Find the Ensime server buffer corresponding to FILE."
  (let ((default-directory (file-name-directory file)))
    (-when-let (project-name (projectile-project-p))
      (--first (-when-let (bufname (buffer-name it))
                 (and (s-contains? "inferior-ensime-server" bufname)
                      (s-contains? (file-name-nondirectory project-name)
                                   bufname)))
               (buffer-list)))))

(defun spacemacs//ensime-flyspell-verify ()
  "Prevent common flyspell false positives in scala-mode."
  (and (flyspell-generic-progmode-verify)
       (not (s-matches? (rx bol (* space) "package") (current-line)))))

;; interactive functions

(defun spacemacs/ensime-gen-and-restart()
  "Regenerate `.ensime' file and restart the ensime server."
  (interactive)
  (progn
    (sbt-command ";ensimeConfig;ensimeConfigProject")
    (ensime-shutdown)
    (ensime)))

(defun spacemacs/ensime-inf-eval-buffer-switch ()
  "Send buffer content to shell and switch to it in insert mode."
  (interactive)
  (ensime-inf-eval-buffer)
  (ensime-inf-switch)
  (evil-insert-state))

(defun spacemacs/ensime-inf-eval-region-switch (start end)
  "Send region content to shell and switch to it in insert mode."
  (interactive "r")
  (ensime-inf-switch)
  (ensime-inf-eval-region start end)
  (evil-insert-state))

(defun spacemacs/ensime-refactor-accept ()
  (interactive)
  (funcall continue-refactor)
  (ensime-popup-buffer-quit-function))

(defun spacemacs/ensime-refactor-cancel ()
  (interactive)
  (funcall cancel-refactor)
  (ensime-popup-buffer-quit-function))

(defun spacemacs/ensime-completing-dot ()
  "Insert a period and show company completions."
  (interactive "*")
  (when (s-matches? (rx (+ (not space)))
                    (buffer-substring (line-beginning-position) (point)))
    (delete-horizontal-space t))
  (company-abort)
  (insert ".")
  (company-complete))

(defun spacemacs/ensime-yank-type-at-point ()
  "Yank to kill ring and print short type name at point to the minibuffer."
  (interactive)
  (ensime-type-at-point t nil))

(defun spacemacs/ensime-yank-type-at-point-full-name ()
  "Yank to kill ring and print full type name at point to the minibuffer."
  (interactive)
  (ensime-type-at-point t t))


;; eclim

(defun spacemacs//java-setup-eclim ()
  "Setup Eclim."
  ;; jump handler
  (add-to-list 'spacemacs-jump-handlers '(eclim-java-find-declaration :async t))
  ;; enable eclim
  (eclim-mode))

(defun spacemacs//java-setup-eclim-company ()
  "Setup Eclim auto-completion."
  (spacemacs|add-company-backends
    :backends company-emacs-eclim
    :modes eclim-mode
    :hooks nil)
  ;; call manualy generated functions by the macro
  (spacemacs//init-company-eclim-mode)
  (set (make-variable-buffer-local 'company-idle-delay) 0.5)
  (set (make-variable-buffer-local 'company-minimum-prefix-length) 1)
  (company-mode))

(defun spacemacs//java-setup-eclim-flycheck ()
  "Setup Eclim syntax checking."
  (flycheck-eclim-setup)
  ;; disable auto check, use `SPC e e'
  (setq eclim-autoupdate-problems nil)
  (set (make-local-variable 'flycheck-check-syntax-automatically) nil)
  (flycheck-mode))

(defun spacemacs/java-eclim-completing-dot ()
  "Insert a period and show company completions."
  (interactive "*")
  (spacemacs//java-delete-horizontal-space)
  (insert ".")
  (company-emacs-eclim 'interactive))

(defun spacemacs/java-eclim-completing-double-colon ()
  "Insert double colon and show company completions."
  (interactive "*")
  (spacemacs//java-delete-horizontal-space)
  (insert ":")
  (let ((curr (point)))
    (when (s-matches? (buffer-substring (- curr 2) (- curr 1)) ":")
      (company-emacs-eclim 'interactive))))


;; meghanada

(defun spacemacs//java-setup-meghanada ()
  "Setup Meghanada."
  (require 'meghanada)
  ;; jump handler
  (add-to-list 'spacemacs-jump-handlers
               '(meghanada-jump-declaration
                 :async spacemacs//java-meghanada-server-livep))
  ;; auto-install meghanada server
  (let ((dest-jar (meghanada--locate-server-jar)))
    (unless dest-jar
      (meghanada-install-server)))
  ;; enable meghanada
  (meghanada-mode))

(defun spacemacs//java-setup-meghanada-company ()
  "Setup Meghanada auto-completion."
  (meghanada-company-enable))

(defun spacemacs//java-setup-meghanada-flycheck ()
  "Setup Meghanada syntax checking."
  (spacemacs/enable-flycheck 'java-mode)
  (require 'flycheck-meghanada)
  (add-to-list 'flycheck-checkers 'meghanada)
  (flycheck-mode))

(defun spacemacs//java-meghanada-server-livep ()
  "Return non-nil if the Meghanada server is up."
  (and meghanada--client-process (process-live-p meghanada--client-process)))


;; Maven

(defun spacemacs/mvn-clean-compile ()
  "Recompile using maven."
  (interactive)
  (mvn-clean)
  (mvn-compile))


;; Gradle

(defun spacemacs/gradle-clean ()
  "Execute 'gradle clean' command."
  (interactive)
  (gradle-execute "clean"))

(defun spacemacs/gradle-clean-build ()
  "Execute 'gradle clean build' command."
  (interactive)
  (gradle-execute "clean build"))

(defun spacemacs/gradle-test-buffer ()
  "Execute 'gradle test' command against current buffer tests."
  (interactive)
  (gradle-single-test (file-name-base (buffer-file-name))))


;; Misc

(defun spacemacs//java-delete-horizontal-space ()
  (when (s-matches? (rx (+ (not space)))
                    (buffer-substring (line-beginning-position) (point)))
    (delete-horizontal-space t)))