/*
 * @author  xamidev <xamidev@riseup.net>
 * @brief   PepperOS kernel entry point
 * @license GPL-3.0-only
 */

#include <stdbool.h>
#include <stddef.h>
#include <limine.h>
#include "io/term/term.h"
#include "io/term/printf.h"
#include "io/serial/serial.h"
#include "mem/gdt/gdt.h"
#include "mem/misc/utils.h"
#include "idt/idt.h"
#include "kernel.h"
#include "time/timer.h"
#include "io/kbd/ps2.h"
#include "mem/paging/pmm.h"
#include "mem/paging/paging.h"
#include "mem/paging/vmm.h"
#include "mem/heap/kheap.h"
#include "sched/process.h"
#include "sched/scheduler.h"
#include "config.h"
#include "io/term/flanterm.h"
#include "io/term/flanterm_backends/fb.h"

// Limine version used
__attribute__((used, section(".limine_requests")))
volatile LIMINE_BASE_REVISION(3);

/*
 * hcf - Halt and catch fire
 *
 * This function is called only in the case of an unrecoverable
 * error. It halts interrupts, and stops execution. The machine
 * will stay in an infinite loop state.
 */
void hcf()
{
	CLEAR_INTERRUPTS; for (;;)asm("hlt");
}

/*
 * idle - Make the machine idle
 *
 * When there is nothing else to do, this function
 * gets called. It can be interrupted, so it allows
 * the scheduler, timer, and keyboard to work.
 */
void idle() {SET_INTERRUPTS; for(;;)asm("hlt");}

struct flanterm_context *ft_ctx;
struct boot_context boot_ctx;
struct init_status init = {0};

extern volatile struct limine_framebuffer_request framebuffer_request;
extern volatile struct limine_memmap_request memmap_request;
extern volatile struct limine_hhdm_request hhdm_request;
extern volatile struct limine_kernel_address_request kerneladdr_request;

extern struct process_t* processes_list;
extern struct process_t* current_process;
struct process_t* idle_proc;

bool iran = false;

// Never gets executed although pedicel is scheduled?
void pedicel_main(void* arg)
{
	//panic(NULL, "test");
	bool iran = true;
	// FROM THE NEXT LINE ONWARDS, CANNOT WRITE TO FRAMEBUFFER WITHOUT PAGE FAULT!
	//printf("\n\nWelcome to PepperOS! Pedicel speaking.\nNothing left to do, halting the system!");
}

void idle_main(void* arg)
{
	for (;;) {
		asm("hlt");
	}
}

extern uintptr_t kheap_start;

/*
 * kmain - Kernel entry point
 *
 * This is where execution begins at handoff from Limine.
 * The function fetches all needed information from the
 * bootloader, initializes all kernel modules and structures,
 * and then goes in an idle state.
 */
void kmain()
{
	CLEAR_INTERRUPTS;
	if (!LIMINE_BASE_REVISION_SUPPORTED) hcf();

	serial_init();
	timer_init();

	// Populate boot context
 	boot_ctx.fb = framebuffer_request.response ? framebuffer_request.response->framebuffers[0] : NULL;
	boot_ctx.mmap = memmap_request.response ? memmap_request.response : NULL;
	boot_ctx.hhdm = hhdm_request.response ? hhdm_request.response : NULL;
	boot_ctx.kaddr = kerneladdr_request.response ? kerneladdr_request.response : NULL;

	boot_mem_display();
	pmm_init(boot_ctx);

	// Remap kernel , HHDM and framebuffer
	paging_init(boot_ctx);
	kheap_init();

	keyboard_init(FR);

	term_init();

	gdt_init();
	idt_init();
	
	process_init();
	idle_proc = process_create("idle", (void*)idle_main, 0);
	struct process_t* pedicel = process_create("pedicel", (void*)pedicel_main, 0);

	process_display_list(processes_list);

	scheduler_init();

	kputs(PEPPEROS_SPLASH);
	idle();
}