add billing face

watch-faces/complication/billing_face.h

@@ -0,0 +1,79 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2025 OpenCode
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef BILLING_FACE_H_
+#define BILLING_FACE_H_
+
+/*
+ * BILLING FACE
+ *
+ * A stopwatch-style face that accrues money instead of elapsed time. You set an
+ * hourly rate (in generic monetary units) using an on-face editor, and the face
+ * displays the current amount billed for the time elapsed since you started it.
+ *
+ * Controls:
+ *   - Alarm button: start / stop the billing timer.
+ *   - Light button (when stopped): reset the timer.
+ *   - Light button long press: enter the rate editor (or, inside the editor,
+ *     save the rate and exit).
+ *   - Inside the editor:
+ *       - Light button: move to the next digit.
+ *       - Alarm button: increment the current digit.
+ *       - Alarm button long press: rapidly increment the current digit.
+ *       - Mode button or Light long press: save and exit.
+ *
+ * Display (money only):
+ *   - Bottom 6 digits: the amount billed, space-padded (no leading zeros),
+ *     saturating at 999999 when it no longer fits in 6 digits.
+ *   - Top-right 2 digits: the two most-significant digits of the hourly rate,
+ *     as a reminder of what you're billing at.
+ */
+
+#include "movement.h"
+
+typedef struct {
+    bool running;
+    rtc_counter_t start_counter;   // virtual 128 Hz start time (so resume is accurate)
+    rtc_counter_t paused_counter;  // accumulated ticks while stopped
+    uint32_t rate_money_per_hour;  // hourly rate
+    uint32_t saved_rate;           // rate at editor entry, restored if the edit times out
+    uint8_t mode;                  // 0 = normal, 1 = editing rate
+    uint8_t cursor;                // active digit (0..5) while editing
+    bool editor_quick;             // auto-increment while Alarm is held
+} billing_state_t;
+
+void billing_face_setup(uint8_t watch_face_index, void ** context_ptr);
+void billing_face_activate(void *context);
+bool billing_face_loop(movement_event_t event, void *context);
+void billing_face_resign(void *context);
+
+#define billing_face ((const watch_face_t){ \
+    billing_face_setup, \
+    billing_face_activate, \
+    billing_face_loop, \
+    billing_face_resign, \
+    NULL, \
+})
+
+#endif // BILLING_FACE_H_