From 9360e26b46ec0bfb4eca5f8386b94805ae188e3c Mon Sep 17 00:00:00 2001
From: Nick Van Doorn <vandoorn.nick@gmail.com>
Date: Sun, 23 Jun 2019 17:10:20 -0700
Subject: Calculate working time

---
 core.c      | 36 ++++++++++++++++++++++++++++++------
 core.h      |  2 ++
 core.test.c | 23 +++++++++++++++++++++++
 3 files changed, 55 insertions(+), 6 deletions(-)

diff --git a/core.c b/core.c
index 43ec1b0..18b1925 100644
--- a/core.c
+++ b/core.c
@@ -52,23 +52,47 @@ void gitrolex_parseArgs(struct State_t *s, int argc, const char *argv[]) {
   replaceChar(s->taskArgs, '$', '-');
 }
 
+// TODO return a message/status such that we can test this
+// (printing directly to the screen makes this hard)
 enum Error_t gitrolex_status(struct State_t *s) {
   enum DatabaseError_t r;
   char msg[512];
   int size = 2048;
   struct TimeEnty_t entries[2048];
   r = database_getEntries(s->taskArgs, entries, &size);
-  if(r != OK) {
-    printError("Ya blew it");
+  if(r != OK || size <= 0) {
+    printError("Failed to read from db");
+    return OK;
+  }
+  else if (size == 1) {
+    sprintf(msg, "Starting %s", s->taskArgs);
+  }
+  else {
+    long workingTime = gitrolex_calculateWorkingTime(entries, size);
+    sprintf(msg, "You've been working on %s for %ld seconds", s->taskArgs, workingTime);
   }
-  struct TimeEnty_t *start = entries;
-  struct TimeEnty_t *end = &entries[size - 1];
-  long diff = end->datetime - start->datetime;
-  sprintf(msg, "You've been working on %s for %ld seconds", s->taskArgs, diff);
   printInfo(msg);
   return OK;
 }
 
+long gitrolex_calculateWorkingTime(struct TimeEnty_t *t, int size) {
+  if (size < 2) return -1;
+  long sum;
+  sum = 0;
+  for(int i = 0; i < size - 1; i += 2) {
+    struct TimeEnty_t *start = &t[i];
+    struct TimeEnty_t *end = &t[i + 1];
+    // we should always be taking the diff
+    // between a checkout "e.g working on it" and a
+    // check in "e.eg finishing work"
+    if(start->direction != OUT || end->direction != IN) {
+      return -1;
+    }
+    sum += end->datetime - start->datetime;
+  }
+  return sum;
+}
+
 enum Error_t pushNow(struct State_t *s, bool direction) {
   enum DatabaseError_t r;
   struct TimeEnty_t entry = {
diff --git a/core.h b/core.h
index b75b022..83b8486 100644
--- a/core.h
+++ b/core.h
@@ -4,6 +4,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <stdbool.h>
+#include "database.h"
 
 int gitrolex_core();
 
@@ -27,5 +28,6 @@ enum Error_t {
 };
 
 void gitrolex_parseArgs(struct State_t *s, int argc, const char *argv[]);
+long gitrolex_calculateWorkingTime(struct TimeEnty_t *t, int size);
 
 #endif
diff --git a/core.test.c b/core.test.c
index 3a197c8..3e9a327 100644
--- a/core.test.c
+++ b/core.test.c
@@ -42,7 +42,30 @@ fail:
   return -1;
 }
 
+int calculateWorkingTimeTest() {
+  int size;
+  long result;
+  size = 4;
+  struct TimeEnty_t input[] = {
+    {
+      .direction = OUT, .datetime = 0
+    },
+    {
+      .direction = IN, .datetime = 5
+    },
+    {
+      .direction = OUT, .datetime = 15
+    },
+    {
+      .direction = IN, .datetime = 20
+    }
+  };
+  result = gitrolex_calculateWorkingTime(input, size);
+  return result != 10;
+}
+
 int main() {
   syncTest("gitrolex_parseArgs", "Failed to parse command line arguments", parseArgsTest);
+  syncTest("gitrolex_calculateWorkingTime", "Failed to calculate working time", calculateWorkingTimeTest);
   database_test();
 }
-- 
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