#include "low_level_display_epaper.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

// Note: This is a placeholder implementation
// You'll need to add the actual e-paper driver code to lib/epaper/

LowLevelDisplayEPaper::LowLevelDisplayEPaper(const epaper_config* cfg, int w, int h)
    : config(cfg), width(w), height(h), initialized(false), framebuffer(nullptr), dirty(false) {
    
    // Allocate framebuffer (1 bit per pixel for monochrome e-paper)
    int buffer_size = (width * height + 7) / 8;  // Round up to nearest byte
    framebuffer = (uint8_t*)malloc(buffer_size);
    if (framebuffer) {
        memset(framebuffer, 0xFF, buffer_size);  // White
    }
}

LowLevelDisplayEPaper::~LowLevelDisplayEPaper() {
    if (framebuffer) {
        free(framebuffer);
    }
}

bool LowLevelDisplayEPaper::init() {
    if (initialized) {
        return true;
    }
    
    if (!framebuffer) {
        printf("Failed to allocate framebuffer for e-paper display\n");
        return false;
    }
    
    // TODO: Implement e-paper initialization
    // epaper_init(config, width, height);
    printf("E-paper display initialized: %dx%d (stub)\n", width, height);
    initialized = true;
    return false;  // Return false until actual driver is implemented
}

void LowLevelDisplayEPaper::clear(bool white) {
    if (!framebuffer) return;
    
    int buffer_size = (width * height + 7) / 8;
    memset(framebuffer, white ? 0xFF : 0x00, buffer_size);
    dirty = true;
}

void LowLevelDisplayEPaper::draw_pixel(int x, int y, bool white) {
    if (!framebuffer || x < 0 || x >= width || y < 0 || y >= height) {
        return;
    }
    
    int byte_index = (y * width + x) / 8;
    int bit_index = 7 - ((y * width + x) % 8);
    
    if (white) {
        framebuffer[byte_index] |= (1 << bit_index);
    } else {
        framebuffer[byte_index] &= ~(1 << bit_index);
    }
    
    dirty = true;
}

void LowLevelDisplayEPaper::draw_buffer(const uint8_t* bit_buffer) {
    if (!bit_buffer || !framebuffer) return;
    
    // Direct copy of 1-bit buffer
    int buffer_size = (width * height + 7) / 8;
    memcpy(framebuffer, bit_buffer, buffer_size);
    dirty = true;
}

void LowLevelDisplayEPaper::refresh() {
    if (!dirty || !framebuffer) {
        return;
    }
    
    // TODO: Implement actual e-paper refresh
    // epaper_update(framebuffer);
    printf("E-paper refresh (stub)\n");
    
    dirty = false;
}

void LowLevelDisplayEPaper::clear_display() {
    clear(true);  // Fill with white
    refresh();
}

void LowLevelDisplayEPaper::sleep() {
    // TODO: Implement e-paper sleep mode
    // epaper_sleep();
}