#include "Configuration.h"

#include "ultralcd.h"
#include "language.h"
#include "util.h"

// Allocate the version string in the program memory. Otherwise the string lands either on the stack or in the global RAM.
const char FW_VERSION_STR[] PROGMEM = FW_version;

const char* FW_VERSION_STR_P()
{
    return FW_VERSION_STR;
}

const char FW_PRUSA3D_MAGIC_STR[] PROGMEM = FW_PRUSA3D_MAGIC;

const char* FW_PRUSA3D_MAGIC_STR_P()
{
    return FW_PRUSA3D_MAGIC_STR;
}

const char STR_REVISION_DEV  [] PROGMEM = "dev";
const char STR_REVISION_ALPHA[] PROGMEM = "alpha";
const char STR_REVISION_BETA [] PROGMEM = "beta";
const char STR_REVISION_RC   [] PROGMEM = "rc";

inline bool is_whitespace_or_nl(char c)
{
    return c == ' ' || c == '\t' || c == '\n' || c == 'r';
}

inline bool is_whitespace_or_nl_or_eol(char c)
{
    return c == 0 || c == ' ' || c == '\t' || c == '\n' || c == '\r';
}

inline bool is_digit(char c)
{
    return c >= '0' && c <= '9';
}

// Parse a major.minor.revision version number.
// Return true if valid.
inline bool parse_version(const char *str, uint16_t version[4])
{   
#if 0
    SERIAL_ECHOPGM("Parsing version string ");
    SERIAL_ECHO(str);
    SERIAL_ECHOLNPGM("");
#endif

    const char *major = str;
    const char *p = str;
    while (is_digit(*p)) ++ p;
    if (*p != '.')
        return false;
    const char *minor = ++ p;
    while (is_digit(*p)) ++ p;
    if (*p != '.')
        return false;
    const char *rev = ++ p;
    while (is_digit(*p)) ++ p;
    if (! is_whitespace_or_nl_or_eol(*p) && *p != '-')
        return false;

    char *endptr = NULL;
    version[0] = strtol(major, &endptr, 10);
    if (endptr != minor - 1)
        return false;
    version[1] = strtol(minor, &endptr, 10);
    if (endptr != rev - 1)
        return false;
    version[2] = strtol(rev, &endptr, 10);
    if (endptr != p)
        return false;

    version[3] = FIRMWARE_REVISION_RELEASED;
    if (*p ++ == '-') {
        const char *q = p;
        while (! is_whitespace_or_nl_or_eol(*q))
            ++ q;
        uint8_t n = q - p;
        if (n == strlen_P(STR_REVISION_DEV) && strncmp_P(p, STR_REVISION_DEV, n) == 0)
            version[3] = FIRMWARE_REVISION_DEV;
        else if (n == strlen_P(STR_REVISION_ALPHA) && strncmp_P(p, STR_REVISION_ALPHA, n) == 0)
            version[3] = FIRMWARE_REVISION_ALPHA;
        else if (n == strlen_P(STR_REVISION_BETA) && strncmp_P(p, STR_REVISION_BETA, n) == 0)
            version[3] = FIRMWARE_REVISION_BETA;
        else if ((n == 2 || n == 3) && p[0] == 'r' && p[1] == 'c') {
            if (n == 2)
                version[3] = FIRMWARE_REVISION_RC;
            else {
                if (is_digit(p[2]))
                    version[3] = FIRMWARE_REVISION_RC + p[2] - '1';
                else
                    return false;
            }
        } else
            return false;
    }

#if 0
    SERIAL_ECHOPGM("Version parsed, major: ");
    SERIAL_ECHO(version[0]);
    SERIAL_ECHOPGM(", minor: ");
    SERIAL_ECHO(version[1]);
    SERIAL_ECHOPGM(", revision: ");
    SERIAL_ECHO(version[2]);
    SERIAL_ECHOPGM(", flavor: ");
    SERIAL_ECHO(version[3]);
    SERIAL_ECHOLNPGM("");
#endif
    return true;
}

inline bool strncmp_PP(const char *p1, const char *p2, uint8_t n)
{
    for (; n > 0; -- n, ++ p1, ++ p2) {
        if (pgm_read_byte(p1) < pgm_read_byte(p2))
            return -1;
        if (pgm_read_byte(p1) > pgm_read_byte(p2))
            return 1;
        if (pgm_read_byte(p1) == 0)
            return 0;
    }
    return 0;
}

// Parse a major.minor.revision version number.
// Return true if valid.
inline bool parse_version_P(const char *str, uint16_t version[4])
{    
#if 0
    SERIAL_ECHOPGM("Parsing version string ");
    SERIAL_ECHORPGM(str);
    SERIAL_ECHOLNPGM("");
#endif

    const char *major = str;
    const char *p = str;
    while (is_digit(char(pgm_read_byte(p)))) ++ p;
    if (pgm_read_byte(p) != '.')
        return false;
    const char *minor = ++ p;
    while (is_digit(char(pgm_read_byte(p)))) ++ p;
    if (pgm_read_byte(p) != '.')
        return false;
    const char *rev = ++ p;
    while (is_digit(char(pgm_read_byte(p)))) ++ p;
    if (! is_whitespace_or_nl_or_eol(char(pgm_read_byte(p))) && pgm_read_byte(p) != '-')
        return false;

    char buf[5];
    uint8_t n = minor - major - 1;
    if (n > 4)
        return false;
    memcpy_P(buf, major, n); buf[n] = 0;
    char *endptr = NULL;
    version[0] = strtol(buf, &endptr, 10);
    if (*endptr != 0)
        return false;
    n = rev - minor - 1;
    if (n > 4)
        return false;
    memcpy_P(buf, minor, n); buf[n] = 0;
    version[1] = strtol(buf, &endptr, 10);
    if (*endptr != 0)
        return false;
    n = p - rev;
    if (n > 4)
        return false;
    memcpy_P(buf, rev, n);
    buf[n] = 0;
    version[2] = strtol(buf, &endptr, 10);
    if (*endptr != 0)
        return false;

    version[3] = FIRMWARE_REVISION_RELEASED;
    if (pgm_read_byte(p ++) == '-') {
        const char *q = p;
        while (! is_whitespace_or_nl_or_eol(char(pgm_read_byte(q))))
            ++ q;
        n = q - p;
        if (n == strlen_P(STR_REVISION_DEV) && strncmp_PP(p, STR_REVISION_DEV, n) == 0)
            version[3] = FIRMWARE_REVISION_DEV;
        else if (n == strlen_P(STR_REVISION_ALPHA) && strncmp_PP(p, STR_REVISION_ALPHA, n) == 0)
            version[3] = FIRMWARE_REVISION_ALPHA;
        else if (n == strlen_P(STR_REVISION_BETA) && strncmp_PP(p, STR_REVISION_BETA, n) == 0)
            version[3] = FIRMWARE_REVISION_BETA;
        else if ((n == 2 || n == 3) && strncmp_PP(p, STR_REVISION_RC, 2) == 0) {
            if (n == 2)
                version[3] = FIRMWARE_REVISION_RC;
            else {
                p += 2;
                if (is_digit(pgm_read_byte(p)))
                    version[3] = FIRMWARE_REVISION_RC + pgm_read_byte(p) - '1';
                else
                    return false;
            }
        } else
            return false;
    }

#if 0
    SERIAL_ECHOPGM("Version parsed, major: ");
    SERIAL_ECHO(version[0]);
    SERIAL_ECHOPGM(", minor: ");
    SERIAL_ECHO(version[1]);
    SERIAL_ECHOPGM(", revision: ");
    SERIAL_ECHO(version[2]);
    SERIAL_ECHOPGM(", flavor: ");
    SERIAL_ECHO(version[3]);
    SERIAL_ECHOLNPGM("");
#endif
    return true;
}

// 1 - yes, 0 - false, -1 - error;
inline int8_t is_provided_version_newer(const char *version_string)
{
    uint16_t ver_gcode[3], ver_current[3];
    if (! parse_version(version_string, ver_gcode))
        return -1;
    if (! parse_version_P(FW_VERSION_STR, ver_current))
        return 0; // this shall not happen
    for (uint8_t i = 0; i < 3; ++ i)
        if (ver_gcode[i] > ver_current[i])
            return 1;
    return 0;
}

bool show_upgrade_dialog_if_version_newer(const char *version_string)
{
    uint16_t ver_gcode[4], ver_current[4];
    if (! parse_version(version_string, ver_gcode)) {
//        SERIAL_PROTOCOLLNPGM("parse_version failed");
        return false;
    }
    if (! parse_version_P(FW_VERSION_STR, ver_current)) {
//        SERIAL_PROTOCOLLNPGM("parse_version_P failed");
        return false; // this shall not happen
    }
//    SERIAL_PROTOCOLLNPGM("versions parsed");
    bool upgrade = false;
    for (uint8_t i = 0; i < 4; ++ i) {
        if (ver_gcode[i] > ver_current[i]) {
            upgrade = true;
            break;
        } else if (ver_gcode[i] < ver_current[i])
            break;
    }

    if (upgrade) {
        lcd_display_message_fullscreen_P(MSG_NEW_FIRMWARE_AVAILABLE);
        lcd_print_at_PGM(0, 2, PSTR(""));
        for (const char *c = version_string; ! is_whitespace_or_nl_or_eol(*c); ++ c)
            lcd_implementation_write(*c);
        lcd_print_at_PGM(0, 3, MSG_NEW_FIRMWARE_PLEASE_UPGRADE);
        tone(BEEPER, 1000);
        delay_keep_alive(50);
        noTone(BEEPER);
        delay_keep_alive(500);
        tone(BEEPER, 1000);
        delay_keep_alive(50);
        noTone(BEEPER);
        lcd_wait_for_click();
        lcd_update_enable(true);
        lcd_implementation_clear();
        lcd_update();
    }

    // Succeeded.
    return true;
}

void update_current_firmware_version_to_eeprom()
{
    for (int8_t i = 0; i < FW_PRUSA3D_MAGIC_LEN; ++ i)
        eeprom_update_byte((uint8_t*)(EEPROM_FIRMWARE_PRUSA_MAGIC+i), pgm_read_byte(FW_PRUSA3D_MAGIC_STR+i));
    uint16_t ver_current[4];
    if (parse_version_P(FW_VERSION_STR, ver_current)) {
        eeprom_update_word((uint16_t*)EEPROM_FIRMWARE_VERSION_MAJOR,    ver_current[0]);
        eeprom_update_word((uint16_t*)EEPROM_FIRMWARE_VERSION_MINOR,    ver_current[1]);
        eeprom_update_word((uint16_t*)EEPROM_FIRMWARE_VERSION_REVISION, ver_current[2]);
        // See FirmwareRevisionFlavorType for the definition of firmware flavors.
        eeprom_update_word((uint16_t*)EEPROM_FIRMWARE_VERSION_FLAVOR,   ver_current[3]);
    }
}