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#include "wp_display_buffer.h"
#include "wp_control_codes.h"
#include "wp_fixed_codes.h"
#include "wp_layout_shared.h"
#include "wp_record_parser.h"
#include "wp_variable_codes.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

void wp_display_init(WpDisplayBuffer *db) {
    if (db == NULL) {
        return;
    }
    memset(db, 0, sizeof(WpDisplayBuffer));
    db->reveal_codes_split_row = 12; /* Default split */
}

void wp_display_clear(WpDisplayBuffer *db) {
    int y;
    int x;

    if (db == NULL) {
        return;
    }

    for (y = 0; y < WP_SCREEN_HEIGHT; y++) {
        for (x = 0; x < WP_SCREEN_WIDTH; x++) {
            db->cells[y][x].ch = ' ';
            db->cells[y][x].attr = 0x07; /* Light gray on black */
            db->cells[y][x].is_dirty = true;
        }
    }
}

void wp_display_putc(WpDisplayBuffer *db, int x, int y, uint8_t ch, uint8_t attr) {
    if (db != NULL && x >= 0 && x < WP_SCREEN_WIDTH && y >= 0 && y < WP_SCREEN_HEIGHT) {
        if (db->cells[y][x].ch != ch || db->cells[y][x].attr != attr) {
            db->cells[y][x].ch = ch;
            db->cells[y][x].attr = attr;
            db->cells[y][x].is_dirty = true;
        }
    }
}

/* Helper to get a short visible name for a WP code. */
static const char* wp_get_code_name(uint8_t code, uint8_t sub_code) {
    const char *marker;

    if (code < 0xC0U) {
        marker = wp_control_code_marker(code);
        if (marker != NULL) {
            return marker;
        }
    }

    if (code < 0xD0U) {
        return wp_fixed_code_name(code);
    }
    return wp_variable_code_name(code, sub_code);
}

static void wp_display_write_text(WpDisplayBuffer *db, int *col, int *row, const char *text, uint8_t attr)
{
    while (text != NULL && *text != '\0' && *row < WP_SCREEN_HEIGHT) {
        wp_display_putc(db, *col, *row, (uint8_t)*text, attr);
        *col += 1;
        if (*col >= WP_SCREEN_WIDTH) {
            *col = 0;
            *row += 1;
        }
        ++text;
    }
}

static void wp_display_write_record(WpDisplayBuffer *db, int *col, int *row, const WpRecord *rec)
{
    char label[320];
    char detail[192];

    if (rec->type == WP_CODE_CHAR) {
        char ch[2];
        ch[0] = (rec->code >= 0x20 && rec->code < 0x7f) ? (char)rec->code : '.';
        ch[1] = '\0';
        wp_display_write_text(db, col, row, ch, 0x07);
        return;
    }

    if (rec->type == WP_CODE_SINGLE_BYTE) {
        wp_display_write_text(db, col, row, wp_get_code_name(rec->code, rec->sub_code), 0x03);
        return;
    }

    if (rec->type == WP_CODE_FIXED_LENGTH) {
        detail[0] = '\0';
        if (wp_fixed_code_describe_payload(rec->code,
                                           rec->data,
                                           rec->data_length,
                                           detail,
                                           sizeof(detail))) {
            snprintf(label,
                     sizeof(label),
                     "[%02X %s %s%s]",
                     (unsigned)rec->code,
                     wp_get_code_name(rec->code, rec->sub_code),
                     detail,
                     rec->is_complete ? "" : " incomplete");
        } else {
            snprintf(label,
                     sizeof(label),
                     "[%02X %s%s]",
                     (unsigned)rec->code,
                     wp_get_code_name(rec->code, rec->sub_code),
                     rec->is_complete ? "" : " incomplete");
        }
        wp_display_write_text(db, col, row, label, 0x03);
        return;
    }

    if (rec->type == WP_CODE_VARIABLE_LENGTH) {
        const char *name = wp_get_code_name(rec->code, rec->sub_code);

        detail[0] = '\0';
        if (wp_variable_describe_payload(rec, detail, sizeof(detail))) {
            snprintf(label, sizeof(label), "[%02X:%02X %s %s%s%s]",
                     (unsigned)rec->code,
                     (unsigned)rec->sub_code,
                     name,
                     detail,
                     rec->is_complete ? "" : " incomplete",
                     (rec->trailer_present && !rec->trailer_matches) ? " bad-trailer" : "");
        } else {
            snprintf(label, sizeof(label), "[%02X:%02X %s%s%s]",
                     (unsigned)rec->code,
                     (unsigned)rec->sub_code,
                     name,
                     rec->is_complete ? "" : " incomplete",
                     (rec->trailer_present && !rec->trailer_matches) ? " bad-trailer" : "");
        }
        wp_display_write_text(db, col, row, label, 0x03);
        return;
    }

    wp_display_write_text(db, col, row, "[?]", 0x03);
}

void wp_reveal_codes_sync_view(WpLayoutGlobals *wl, WpDisplayBuffer *db) {
    int x;
    int row;
    int col = 0;
    WpLayoutGlobals snapshot;
    static const char separator[] =
        "--------------------------------------------------------------------------------";

    if (wl == NULL || db == NULL || !db->reveal_codes_active) {
        return;
    }

    row = db->reveal_codes_split_row;
    if (row < 0 || row >= WP_SCREEN_HEIGHT) {
        row = WP_SCREEN_HEIGHT / 2;
        db->reveal_codes_split_row = row;
    }

    for (x = 0; x < WP_SCREEN_WIDTH; x++) {
        wp_display_putc(db, x, row, (uint8_t)separator[x], 0x70); /* Inverse divider */
    }

    row++;
    snapshot = *wl;

    while (row < WP_SCREEN_HEIGHT && snapshot.record_used_bytes > 0) {
        WpRecord rec;
        wp_parser_consume_record(&snapshot, &rec);
        if (rec.length == 0) {
            wp_record_free(&rec);
            break;
        }
        wp_display_write_record(db, &col, &row, &rec);
        wp_record_free(&rec);
    }
}

void wp_display_render(WpDisplayBuffer *db) {
    int y;
    int x;

    if (db == NULL) {
        return;
    }

    /* For the host scaffold, rendering only clears the dirty flags.  Front-ends
     * can translate the same buffer into ANSI, SDL, curses, etc. */
    for (y = 0; y < WP_SCREEN_HEIGHT; y++) {
        for (x = 0; x < WP_SCREEN_WIDTH; x++) {
            db->cells[y][x].is_dirty = false;
        }
    }
}
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