From fff06404696bb8790901cdefe016cd8d0fe856cb Mon Sep 17 00:00:00 2001
From: Bad Diode <bd@badd10de.dev>
Date: Fri, 25 Aug 2023 15:42:58 +0200
Subject: Add pattern chain buttons behaviour (toggle/clear/random)

---
 src/sequencer.c | 91 ++++++++++++++++++++++++++++++++++++++++++++-------------
 1 file changed, 71 insertions(+), 20 deletions(-)

(limited to 'src/sequencer.c')

diff --git a/src/sequencer.c b/src/sequencer.c
index 58714cb..266db94 100644
--- a/src/sequencer.c
+++ b/src/sequencer.c
@@ -138,7 +138,7 @@ play_step(void) {
     } else if (current_bank != next_bank && step_counter == 15) {
         select_bank(next_bank);
         update_bpm = true;
-    } else if (chain.len != 0 && step_counter == 15) {
+    } else if (chain.len != 0 && step_counter == 15 && chain.enabled) {
         redraw_pattern_buttons = true;
         update_bpm = true;
         if (!chain.playing) {
@@ -762,6 +762,8 @@ handle_pattern_chain(void) {
     } else if (key_tap(KEY_LEFT)) {
         if (param_selection_loc == 8) {
             param_selection_loc = 15;
+        } else if (param_selection_loc == 16) {
+            param_selection_loc = 18;
         } else if (param_selection_loc > 0) {
             param_selection_loc--;
         } else if (param_selection_loc == 0) {
@@ -770,48 +772,97 @@ handle_pattern_chain(void) {
     } else if (key_tap(KEY_RIGHT)) {
         if (param_selection_loc < 15 && param_selection_loc != 7) {
             param_selection_loc++;
+        } else if (param_selection_loc < 18 && param_selection_loc >= 16) {
+            param_selection_loc++;
+        } else if (param_selection_loc == 18) {
+            param_selection_loc = 16;
         } else if (param_selection_loc == 7) {
             param_selection_loc = 0;
         } else if (param_selection_loc == 15) {
             param_selection_loc = 8;
         }
     } else if (key_tap(KEY_UP)) {
-        if (param_selection_loc <= 7) {
-            param_selection_loc += 8;
-        } else {
+        if (param_selection_loc >= 1 && param_selection_loc <= 2) {
+            param_selection_loc = 16;
+        } else if (param_selection_loc >= 3 && param_selection_loc <= 4) {
+            param_selection_loc = 17;
+        } else if (param_selection_loc >= 5 && param_selection_loc <= 6) {
+            param_selection_loc = 18;
+        } else if (param_selection_loc >= 8 && param_selection_loc <= 15){
             param_selection_loc -= 8;
         }
     } else if (key_tap(KEY_DOWN)) {
         if (param_selection_loc <= 7) {
             param_selection_loc += 8;
-        } else {
-            param_selection_loc -= 8;
+        } else if (param_selection_loc == 16){
+            param_selection_loc = 1;
+        } else if (param_selection_loc == 17){
+            param_selection_loc = 3;
+        } else if (param_selection_loc == 18){
+            param_selection_loc = 5;
         }
     } else if (key_tap(KEY_B)) {
-        if (chain.active[param_selection_loc]) {
-            // Can't toggle current chain.
-            if (!play_status
-                    || param_selection_loc != chain.current
-                    || chain.len == 1) {
-                chain.active[param_selection_loc] = 0;
-                chain.len--;
-            }
-        } else {
-            if (chain.len == 0) {
-                chain.current = param_selection_loc;
-            }
-            chain.active[param_selection_loc] = 1;
-            chain.len++;
+        switch (param_selection_loc) {
+            case CHAIN_BTN_ENABLE: {
+                chain.enabled ^= 1;
+                chain.current = 15;
+                chain.current = find_next_pattern();
+                chain.playing = false;
+            } break;
+            case CHAIN_BTN_CLEAR: {
+                chain.len = 0;
+                chain.playing = false;
+                for (size_t i = 0; i < MAX_CHAIN; i++) {
+                    chain.active[i] = false;
+                    chain.chain[i] = 0;
+                }
+                chain.current = 15;
+                chain.current = find_next_pattern();
+            } break;
+            case CHAIN_BTN_RANDOM: {
+                u8 cur = chain.current % 16;
+                for (size_t i = 0; i < MAX_CHAIN; i++) {
+                    if (i == cur && chain.playing) {
+                        continue;
+                    }
+                    if (rng16() < 32765) {
+                        chain.active[i] = true;
+                    } else {
+                        chain.active[i] = false;
+                    }
+                    // NOTE: Should we also randomize the patterns or isn't it
+                    // necessary?
+                }
+            } break;
+            default: {
+                if (chain.active[param_selection_loc]) {
+                    // Can't toggle current chain.
+                    if (!play_status
+                            || param_selection_loc != chain.current
+                            || chain.len == 1) {
+                        chain.active[param_selection_loc] = 0;
+                        chain.len--;
+                    }
+                } else {
+                    if (chain.len == 0) {
+                        chain.current = param_selection_loc;
+                    }
+                    chain.active[param_selection_loc] = 1;
+                    chain.len++;
+                }
+            } break;
         }
     } else if (key_tap(KEY_L)) {
         if (chain.active[param_selection_loc]
                 && chain.chain[param_selection_loc] > 0
+                && param_selection_loc <= 15
                 && (!play_status || param_selection_loc != chain.current)) {
             chain.chain[param_selection_loc]--;
         }
     } else if (key_tap(KEY_R)) {
         if (chain.active[param_selection_loc]
                 && chain.chain[param_selection_loc] < 7
+                && param_selection_loc <= 15
                 && (!play_status || param_selection_loc != chain.current)) {
             chain.chain[param_selection_loc]++;
         }
-- 
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