#include "btree.h"
#include "file.h"
#include "interface.h"

#include <fs/allocator.h>
#include <fs/context.h>

BTREE_DEFINE_SIMPLE_GET(struct fs_file, unsigned long, f_node, f_id, get_file);
BTREE_DEFINE_SIMPLE_INSERT(struct fs_file, f_node, f_id, put_file);

struct fs_context {
	struct fs_superblock *ctx_sb;
	struct fs_allocator *ctx_alloc;
	struct btree ctx_filelist;

	struct fs_vtable ctx_vtable;
};

struct fs_context *fs_context_create(
	struct fs_allocator *alloc,
	struct fs_superblock *sb)
{
	struct fs_context *ctx = fs_alloc(alloc, sizeof *ctx);
	if (!ctx) {
		return NULL;
	}

	memset(ctx, 0x0, sizeof *ctx);

	ctx->ctx_sb = sb;
	ctx->ctx_alloc = alloc;

	ctx->ctx_vtable.open = fs_msg_open;

	return ctx;
}

void fs_context_destroy(struct fs_context *ctx)
{
	fs_free(ctx->ctx_alloc, ctx);
}

struct fs_file *fs_context_open_file(struct fs_context *ctx, unsigned long id)
{
	struct fs_file *f = get_file(&ctx->ctx_filelist, id);
	if (!f) {
		f = fs_alloc(ctx->ctx_alloc, sizeof *f);
		if (!f) {
			return NULL;
		}

		memset(f, 0x0, sizeof *f);

		f->f_id = id;
		put_file(&ctx->ctx_filelist, f);
	}

	return f;
}

void fs_context_close_file(struct fs_context *ctx, struct fs_file *f)
{
}

struct fs_dentry *fs_context_resolve_path(
	struct fs_context *ctx,
	const char *path)
{
	return NULL;
}

kern_status_t fs_context_dispatch_msg(
	struct fs_context *ctx,
	kern_handle_t channel,
	struct msg_endpoint *sender,
	struct msg_header *hdr)
{
	return fs_dispatch(
		channel,
		&ctx->ctx_vtable,
		sender,
		hdr,
		NULL,
		0,
		ctx);
}