From 2b1da096a6700e5679c520195654764fd3688cf3 Mon Sep 17 00:00:00 2001
From: thematdev <thematdev@thematdev.org>
Date: Mon, 3 Jul 2023 16:39:36 +0300
Subject: [PATCH] Now rendering comments

---
 Makefile   |  2 +-
 src/main.c | 92 +++++++++++++++++++++++++++++++++++++++++++++++++-----
 2 files changed, 85 insertions(+), 9 deletions(-)

diff --git a/Makefile b/Makefile
index e217791..df1c1e0 100644
--- a/Makefile
+++ b/Makefile
@@ -18,7 +18,7 @@ $(BD)/libcgic.a:
 	cp $(LIBS_DIR)/cgic/libcgic.a $(BD)
 
 $(BD)/libqments.a:
-	$(MAKE) -C $(LIBS_DIR)/qments
+	$(MAKE) -C $(LIBS_DIR)/qments static
 	cp $(LIBS_DIR)/qments/$(BD)/libqments.a $(BD)
 
 $(BD)/$(CGI_EXEC): $(OBJ_FILES)
diff --git a/src/main.c b/src/main.c
index 9354186..9727661 100644
--- a/src/main.c
+++ b/src/main.c
@@ -4,12 +4,17 @@
 #include "comment.h"
 #include "cgic.h"
 #include "driver.h"
+#include "drivers/unix_fs/unix_fs_driver.h"
 
 #include <stdlib.h>
 
 #define COMMENTS_PER_PAGE 20
 #define MAX_NAME 1024
 
+#define QMENTS_PATH "qments-storage"
+#define DRIVER_DATA { QMENTS_PATH }
+#define DRIVER unix_fs_driver
+
 void
 fct_callback(char character, void *arg)
 {
@@ -23,11 +28,13 @@ render_comment(const Comment *comment)
     char *retval;
     
     buffer = &_buffer;
-    fctprintf(fct_callback, buffer, "<div class=\"comment\" id=comment_%d\n", comment->id);
+    sb_init_empty(buffer);
+
+    fctprintf(fct_callback, buffer, "<div class=\"comment\" id=comment_%d>\n", comment->id);
     
     /* begin header */
     fctprintf(fct_callback, buffer, "<div class=\"comment-header\">\n");
-    fctprintf(fct_callback, buffer, "Posted by: %s", comment->header->user_displayname);
+    fctprintf(fct_callback, buffer, "Posted by: %s\n", comment->header->user_displayname);
     fctprintf(fct_callback, buffer, "</div>\n");
     /* end header */
 
@@ -54,29 +61,92 @@ free_header(CommentHeader *header)
     free(header->user_displayname);
 }
 
+void
+allocate_comment(Comment *comment)
+{
+    comment->header = malloc(sizeof(CommentHeader));
+    allocate_header(comment->header);
+}
+
+void
+free_comment(Comment *comment)
+{
+    free_header(comment->header);
+    free(comment->header);
+    free(comment->text);
+}
+
 int
 fetch_comment(int id, Driver *driver, void *driver_data, Comment *comment)
 {
     int retval;
     comment->id = id;
 
-    allocate_header(comment->header);
+    allocate_comment(comment);
 
-    retval = driver->get_header(driver_data, comment->header, id) < 0;
+    retval = driver->get_header(driver_data, comment->header, id);
     if (retval < 0) {
         goto defer;
     }
     comment->text = malloc(comment->header->text_length + 1);
 
-    retval = driver->get_text(driver, comment->text, id);
+    retval = driver->get_text(driver_data, comment->text, id);
 defer:
     if (retval < 0) {
-        free_header(comment->header);
-        free(comment->text);
+        free_comment(comment);
     }
     return retval;
 }
 
+/* each page stores comments with ids in [P * (page - 1), P * page)
+ * if page is not specified, then we'll just print last P comments (for now)
+ * TODO: print errors in div
+ */
+void
+print_page()
+{
+    int page, max_id;
+    int id_begin, id_end, i;
+    Comment comment;
+    UnixFsDriverData driver_data = DRIVER_DATA;
+    Driver driver = DRIVER;
+
+    cgiFormInteger("page", &page, 0);
+    if ((max_id = unix_fs_driver_get_max_id(&driver_data)) < 0) {
+        fprintf(cgiOut, "Error fetching comments\n");
+        return;
+    }
+
+    if (page <= 0) {
+        id_end = max_id;
+        id_begin = (max_id > COMMENTS_PER_PAGE ? max_id - COMMENTS_PER_PAGE : 1);
+    } else {
+        /* max_id >= COMMENTS_PER_PAGE * page
+         * perform this check without overflow
+         */
+        if (max_id / page < COMMENTS_PER_PAGE) {
+            fprintf(cgiOut, "There is no such page\n");
+            return;
+        }
+        id_begin = COMMENTS_PER_PAGE * (page - 1);
+        id_end = id_begin + COMMENTS_PER_PAGE;
+        if (id_end > max_id) {
+            id_end = max_id;
+        }
+    }
+
+    for (i = id_begin; i != id_end; ++i) {
+        if (fetch_comment(i, &driver, &driver_data, &comment) < 0) {
+            fprintf(cgiOut, "Failed to fetch comment %d\n", i);
+        } else {
+            char *rendered_comment = render_comment(&comment);
+            fputs(rendered_comment, cgiOut);
+            free(rendered_comment);
+            free_comment(&comment);
+        }
+    }
+}
+
 int
 cgiMain()
 {
@@ -89,7 +159,13 @@ cgiMain()
     fprintf(cgiOut, "</head>\n");
 
     fprintf(cgiOut, "<body>\n");
-    fprintf(cgiOut, 
+    
+    /* print_submit_form(); */
+    
+    fprintf(cgiOut, "<div class=\"comment-section\">\n");
+    print_page();
+    fprintf(cgiOut, "</div>\n");
+
     fprintf(cgiOut, "</body>\n");
 
     fprintf(cgiOut, "</html>\n");