(require 'fcuny-common)

(use-package flycheck
  :ensure t
  :custom ((flycheck-idle-change-delay 2)
           (flycheck-emacs-lisp-load-path 'inherit))
  :config
  (progn
    (use-package flycheck-pos-tip
      :ensure t
      :config
      (flycheck-pos-tip-mode))

    (add-hook 'prog-mode-hook 'flycheck-mode)
    (setq-default flycheck-disabled-checkers '(emacs-lisp-checkdoc))
    (setq flycheck-highlighting-mode 'lines)
    (setq flycheck-check-syntax-automatically '(mode-enabled save))

    (flycheck-define-checker source-check
      "A syntax checker for python source code in Source, using `check.pex'"
      :command ("check.pex" source)
    ;;; errors are reported like this:
    ;;; E241:ERROR   <file name>:<line> <message>
      :error-patterns ((error line-start (id (1+ nonl)) ":ERROR" (1+ nonl) ":" line (message) line-end)
                       (warning line-start (id (1+ nonl)) ":WARNING" (1+ nonl) ":" line (message) line-end))
      :predicate fcuny/check-source-predicate-python-p
      :modes (python-mode))
    (add-to-list 'flycheck-checkers 'source-check)

    (defface fc/flycheck-error
      '((t (:foreground "#f40000")))
      "Face for flycheck error feedback in the modeline."
      :group 'fc/flycheck)
    (defface fc/flycheck-warning
      '((t (:foreground "#724a09")))
      "Face for flycheck warning feedback in the modeline."
      :group 'fc/flycheck)
    ;;; errors are reported like this:
    ;;; E241:ERROR   <file name>:<line> <message>
    (defface fc/flycheck-info
      '((t (:foreground "#19baff")))
      "Face for flycheck info feedback in the modeline."
      :group 'fc/flycheck)
    (defface fc/flycheck-success
      '((t (:foreground "#2cb250")))
      "Face for flycheck success feedback in the modeline."
      :group 'fc/flycheck)

    (setq flycheck-mode-line
        '(:eval
          (pcase flycheck-last-status-change
            (`running (propertize " ⟲ Running" 'face 'fc/flycheck-info))
            (`errored (propertize " ⚠ Error" 'face 'fc/flycheck-error))
            (`no-checker (propertize " ⚠ No Checker" 'face 'fc/flycheck-info))
            (`suspicious (propertize " ⚠ Suspicious" 'face 'fc/flycheck-warning))
            (`not-checked (propertize " ✖ Disabled" 'face 'fc/flycheck-info))
            (`interrupted (propertize " ⚠ Interrupted" 'face 'fc/flycheck-warning))
            (`finished
             (let* ((error-counts (flycheck-count-errors flycheck-current-errors))
                    (no-errors (cdr (assq 'error error-counts)))
                    (no-warnings (cdr (assq 'warning error-counts)))
                    (face (cond (no-errors 'fc/flycheck-error)
                                (no-warnings 'fc/flycheck-warning)
                                (t 'fc/flycheck-success))))
               (propertize (if (or no-errors no-warnings) (format " ✘ %s/%s Issues" (or no-errors 0) (or no-warnings 0)) " ✔ No Issues") 'face face))))))))

(provide 'fcuny-flycheck)