;;; evergarden-common.el --- Shared engine for the evergarden theme family -*- lexical-binding: t; -*-

;; Author: expansion of the original evergarden theme by @koi.rip
;; Version: 0.2.0
;; Package-Requires: ((emacs "28.1") (modus-themes "5.0.0") (ef-themes "2.0.0"))
;; Keywords: faces, theme

;;; Commentary:
;; This is NOT a theme by itself. it is a shared engine for `whiskers` to use and generate the actual evergarden themes.
;;; Code:

(require 'modus-themes)
(require 'ef-themes)

(defgroup evergarden-theme nil
  "Cozy evergarden theme family built on Modus and Ef."
  :group 'faces
  :group 'ef-themes
  :prefix "evergarden-")

(defconst evergarden-theme-family 'evergarden-theme
  "Shared theme family symbol for every evergarden flavor.")

(defconst evergarden--term-mappings-dark
  '((bg-term-black bg-main)
     (fg-term-black bg-main)
     (bg-term-black-bright overlay0)
     (fg-term-black-bright overlay0)
     (bg-term-white fg-dim)
     (fg-term-white fg-dim)
     (bg-term-white-bright fg-main)
     (fg-term-white-bright fg-main))
  "ANSI black/white terminal mapping for dark-background flavors.
Anchors \"black\" to the darkest neutrals and \"white\" to the lightest,
the same relationship a light theme uses just inverted.")

(defconst evergarden--term-mappings-light
  '((bg-term-black fg-main)
     (fg-term-black fg-main)
     (bg-term-black-bright fg-dim)
     (fg-term-black-bright fg-dim)
     (bg-term-white border)
     (fg-term-white border)
     (bg-term-white-bright bg-main)
     (fg-term-white-bright bg-main))
  "ANSI black/white terminal mapping for the light-background flavor (summer).
Matches fortune-gold-theme.el's light-theme convention.")

(defconst evergarden--term-mappings-color
  '((bg-term-red red) (fg-term-red red)
     (bg-term-red-bright red-warmer) (fg-term-red-bright red-warmer)
     (bg-term-green green) (fg-term-green green)
     (bg-term-green-bright green-warmer) (fg-term-green-bright green-warmer)
     (bg-term-yellow yellow) (fg-term-yellow yellow)
     (bg-term-yellow-bright yellow-warmer) (fg-term-yellow-bright yellow-warmer)
     (bg-term-blue blue) (fg-term-blue blue)
     (bg-term-blue-bright blue-warmer) (fg-term-blue-bright blue-warmer)
     (bg-term-magenta magenta) (fg-term-magenta magenta)
     (bg-term-magenta-bright magenta-warmer) (fg-term-magenta-bright magenta-warmer)
     (bg-term-cyan cyan) (fg-term-cyan cyan)
     (bg-term-cyan-bright cyan-warmer) (fg-term-cyan-bright cyan-warmer))
  "ANSI colored-slot terminal mapping, identical for every flavor.
Left as true family colors (not the green signature) since ANSI red should
stay red, ANSI blue should stay blue, etc., regardless of flavor.")

(defconst evergarden-palette-mappings-partial
  (append
    '(;; Status
       (err red)
       (warning orange)
       (info cyan)
       (underline-err red)
       (underline-warning orange)
       (underline-note cyan)
       (modeline-err red)
       (modeline-warning yellow)
       (modeline-info cyan)
       (bg-prominent-warning bg-warning)
       (fg-prominent-warning fg-main)
       (bg-prominent-note bg-info)
       (fg-prominent-note fg-main)

       (fg-link blue)
       (fg-link-visited magenta)
       (fg-link-symbolic cyan)
       (bg-link unspecified)
       (bg-link-symbolic unspecified)
       (bg-link-visited unspecified)
       (underline-link blue)
       (underline-link-visited magenta)
       (underline-link-symbolic cyan)

       (name cyan)
       (keybind green)
       (identifier fg-main)
       (fg-prompt green)
       (bg-prompt unspecified)

       (builtin cyan-cooler)
       (comment overlay2)
       (constant pink)
       (fnname green)
       (fnname-call green-warmer)
       (keyword red)
       (preprocessor cherry)
       (property cyan-cooler)
       (docstring cyan-cooler)
       (docmarkup cyan)
       (string lime)
       (type yellow)
       (variable fg-main)
       (variable-use fg-main)
       (rx-backslash yellow)
       (rx-construct cyan)

       (accent-0 green)
       (accent-1 cyan)
       (accent-2 magenta-warmer)
       (accent-3 orange)

       (fg-button-active fg-main)
       (fg-button-inactive fg-dim)
       (bg-button-active bg-main)
       (bg-button-inactive bg-dim)
       (fg-region fg-main)
       (bg-mark-delete bg-red-subtle)
       (fg-mark-delete red)
       (bg-mark-select bg-green-subtle)
       (fg-mark-select green)
       (bg-mark-other bg-cyan-subtle)
       (fg-mark-other cyan)

       (date-common cyan)
       (date-deadline red)
       (date-deadline-subtle red-faint)
       (date-event fg-alt)
       (date-holiday red-warmer)
       (date-holiday-other magenta-warmer)
       (date-now fg-main)
       (date-range fg-alt)
       (date-scheduled green)
       (date-scheduled-subtle green-faint)
       (date-weekday blue)
       (date-weekend red-faint)

       (fg-prose-code green-cooler)
       (prose-done green)
       (fg-prose-macro green)
       (prose-metadata fg-dim)
       (prose-metadata-value fg-alt)
       (prose-table fg-alt)
       (prose-table-formula cyan)
       (prose-tag yellow-faint)
       (prose-todo red)
       (fg-prose-verbatim magenta-warmer)

       (mail-cite-0 green)
       (mail-cite-1 cyan)
       (mail-cite-2 magenta-warmer)
       (mail-cite-3 red-warmer)
       (mail-part cyan)
       (mail-recipient blue)
       (mail-subject green)
       (mail-other fg-alt)

       (bg-search-static bg-cyan-subtle)
       (bg-search-current bg-green-intense)
       (bg-search-lazy bg-green-subtle)
       (bg-search-replace bg-red-intense)

       (bg-search-rx-group-0 bg-green-intense)
       (bg-search-rx-group-1 bg-magenta-intense)
       (bg-search-rx-group-2 bg-cyan-intense)
       (bg-search-rx-group-3 bg-red-intense)

       (bg-space-err bg-red-intense)
       (bg-space bg-main)
       (fg-space border)

       (fringe bg-main)
       (fg-line-number-active green)
       (fg-line-number-inactive overlay1)
       (bg-line-number-active bg-hl-line)
       (bg-line-number-inactive bg-main)

       (bg-tab-current bg-main)
       (bg-tab-other bg-dim)

       (bg-prominent-err bg-err)
       (fg-prominent-err err)
       (fg-paren-match fg-main)
       (underline-paren-match unspecified)
       (bg-active-argument bg-active)
       (fg-active-argument green)
       (bg-active-value bg-green-subtle)
       (fg-active-value green)

       (bg-prose-block-delimiter bg-prose-block)
       (fg-prose-block-delimiter fg-dim)
       (bg-prose-block-contents bg-prose-block)
       (bg-prose-code unspecified)
       (bg-prose-macro unspecified)
       (bg-prose-verbatim unspecified)

       (fg-completion-match-0 green)
       (fg-completion-match-1 cyan)
       (fg-completion-match-2 magenta-warmer)
       (fg-completion-match-3 orange)
       (bg-completion-match-0 unspecified)
       (bg-completion-match-1 unspecified)
       (bg-completion-match-2 unspecified)
       (bg-completion-match-3 unspecified)
       (bg-completion bg-dim)
       (fg-search-current fg-main)

       (rainbow-0 green)
       (rainbow-1 cyan)
       (rainbow-2 magenta)
       (rainbow-3 blue)
       (rainbow-4 orange)
       (rainbow-5 red)
       (rainbow-6 yellow)
       (rainbow-7 fg-alt)
       (rainbow-8 fg-dim)

       (fg-heading-0 green)
       (fg-heading-1 green)
       (fg-heading-2 cyan)
       (fg-heading-3 magenta)
       (fg-heading-4 blue)
       (fg-heading-5 orange)
       (fg-heading-6 red)
       (fg-heading-7 fg-alt)
       (fg-heading-8 fg-dim)
       (bg-heading-0 unspecified)
       (bg-heading-1 bg-green-nuanced)
       (bg-heading-2 unspecified)
       (bg-heading-3 bg-magenta-nuanced)
       (bg-heading-4 bg-blue-nuanced)
       (bg-heading-5 unspecified)
       (bg-heading-6 bg-red-nuanced)
       (bg-heading-7 unspecified)
       (bg-heading-8 unspecified)
       (overline-heading-0 green)
       (overline-heading-1 green)
       (overline-heading-2 cyan)
       (overline-heading-3 magenta)
       (overline-heading-4 blue)
       (overline-heading-5 orange)
       (overline-heading-6 red)
       (overline-heading-7 unspecified)
       (overline-heading-8 unspecified))
    evergarden--term-mappings-color)
  "Semantic color mappings shared by every evergarden flavor.
Only references palette symbol names, never literal hex, so the exact same
list works whether the active flavor's palette is dark or light.")

(defconst evergarden-custom-faces
  '(`(corfu-default ((,c :inherit modus-themes-fixed-pitch
                       :background ,bg-dim
                       :foreground ,fg-main)))
     `(corfu-current ((,c :background ,bg-green-intense
                        :foreground ,fg-main
                        :extend t
                        :box (:line-width -1 :color ,green)
                        :weight semi-bold)))
     `(corfu-border ((,c :background ,border
                       :foreground ,border)))
     `(corfu-bar ((,c :background ,green)))
     `(corfu-popupinfo ((,c :background ,bg-dim
                          :foreground ,fg-main))))
  "Additional face overrides shared by every evergarden flavor.")

(defun evergarden--ensure-modus-theme-metadata (name family description mode palette-sym overrides-sym)
  "Declare NAME as a Modus-derived theme when reloading in-session.

FAMILY, DESCRIPTION, MODE, PALETTE-SYM and OVERRIDES-SYM are forwarded to
`modus-themes-declare', matching what `modus-themes-theme' expects to find
if the theme object already exists in the current session."
  (unless (plist-get (get name 'theme-properties) :modus-core-palette)
    (modus-themes-declare name family description mode palette-sym nil overrides-sym)
    (modus-themes-register name)))

(defun evergarden-build-theme (flavor-name palette-partial mode)
  "Register and define one evergarden flavor.

FLAVOR-NAME is a symbol like `evergarden-fall'. PALETTE-PARTIAL is that
flavor's base palette (its own analogue of one spring.lua/summer.lua/
fall.lua/winter.lua table, plus the warmer/cooler/faint/intense/subtle/
nuanced variants Modus needs). MODE is `dark' or `light' and selects which
of `evergarden--term-mappings-dark'/`-light' gets appended."
  (let* ((flavor-str (symbol-name flavor-name))
          (description (format "Cozy evergarden dark theme, %s flavor."
                         (capitalize (substring flavor-str (length "evergarden-")))))
          (palette-sym (intern (concat flavor-str "-palette")))
          (overrides-sym (intern (concat flavor-str "-palette-overrides")))
          (term-mappings (if (eq mode 'dark)
                           evergarden--term-mappings-dark
                           evergarden--term-mappings-light)))
    (eval
      `(progn
         (defcustom ,overrides-sym nil
           ,(format "Overrides for `%s'.

Each element should have the form (NAME VALUE), where NAME is a palette
entry from `%s' and VALUE is either another palette symbol or a color
string."
              palette-sym palette-sym)
           :group 'evergarden-theme
           :package-version '(evergarden-theme . "0.2.0")
           :type '(repeat (list symbol (choice symbol string))))

         (defconst ,palette-sym
           (modus-themes-generate-palette
             ',palette-partial
             ',(if (eq mode 'dark) 'cool 'warm)
             nil
             (append evergarden-palette-mappings-partial
               ',term-mappings
               ef-themes-palette-common))
           ,(format "Full palette for `%s'." flavor-name))

         (evergarden--ensure-modus-theme-metadata
           ',flavor-name 'evergarden-theme ,description ',mode ',palette-sym ',overrides-sym)

         (modus-themes-theme
           ',flavor-name 'evergarden-theme ,description ',mode
           ',palette-sym nil ',overrides-sym 'evergarden-custom-faces))
      t)))

;;;###autoload
(when load-file-name
  (add-to-list 'custom-theme-load-path
    (file-name-as-directory
      (file-name-directory load-file-name))))

(provide 'evergarden-common)

;;; evergarden-common.el ends here