#include "relation_cal.h"
#include <string.h>

#define SCREEN_WIDTH    (lv_obj_get_width(lv_scr_act()))
#define SCREEN_HEIGHT   (lv_obj_get_height(lv_scr_act()))

#define DEMO_WIDTH (int32_t)((SCREEN_WIDTH * 0.85f))
#define DEMO_HEIGHT (int32_t)(((DEMO_WIDTH) / 16.0f) * 9.0f)
#define DEMO_TITLE_HEIGHT (int32_t)(((DEMO_WIDTH) / 16.0f) * 1.2f)

static relation_cal_t g_rel_cal;

static const relation_transformation_t transitions[] = {
    // Self - related relationships
    {REL_SELF, REL_SELF, REL_SELF},                       // Self to self remains self
    {REL_SELF, REL_FATHER, REL_FATHER},                   // Self to father is father
    {REL_SELF, REL_MOTHER, REL_MOTHER},                   // Self to mother is mother
    {REL_SELF, REL_SON, REL_SON},                         // Self to son is son
    {REL_SELF, REL_DAUGHTER, REL_DAUGHTER},               // Self to daughter is daughter
    {REL_SELF, REL_ELDER_BROTHER, REL_ELDER_BROTHER},     // Self to elder brother is elder brother
    {REL_SELF, REL_YOUNGER_BROTHER, REL_YOUNGER_BROTHER}, // Self to younger brother is younger brother
    {REL_SELF, REL_ELDER_SISTER, REL_ELDER_SISTER},       // Self to elder sister is elder sister
    {REL_SELF, REL_YOUNGER_SISTER, REL_YOUNGER_SISTER},   // Self to younger sister is younger sister

    // Parent - child relationships
    {REL_FATHER, REL_SON, REL_SELF},      // Father to son is self
    {REL_FATHER, REL_DAUGHTER, REL_SELF}, // Father to daughter is self
    {REL_FATHER, REL_WIFE, REL_MOTHER},
    {REL_MOTHER, REL_SON, REL_SELF},      // Mother to son is self
    {REL_MOTHER, REL_DAUGHTER, REL_SELF}, // Mother to daughter is self
    {REL_MOTHER, REL_HUSBAND, REL_FATHER},
    {REL_SON, REL_FATHER, REL_SELF},      // Son to father is self
    {REL_SON, REL_MOTHER, REL_SELF},      // Son to mother is self
    {REL_DAUGHTER, REL_FATHER, REL_SELF}, // Daughter to father is self
    {REL_DAUGHTER, REL_MOTHER, REL_SELF}, // Daughter to mother is self

    // Grandparent relationships
    {REL_FATHER, REL_FATHER, REL_GRANDFATHER}, // Father's father is grandfather
    {REL_FATHER, REL_MOTHER, REL_GRANDMOTHER}, // Father's mother is grandmother
    {REL_MOTHER, REL_FATHER, REL_GRANDFATHER}, // Mother's father is grandfather
    {REL_MOTHER, REL_MOTHER, REL_GRANDMOTHER}, // Mother's mother is grandmother
    {REL_GRANDFATHER, REL_SON, REL_FATHER},     // Grandfather to son is father
    {REL_GRANDFATHER, REL_DAUGHTER, REL_AUNT}, // Grandfather to daughter is aunt
    {REL_GRANDMOTHER, REL_SON, REL_FATHER},    // Grandmother to son is father
    {REL_GRANDMOTHER, REL_DAUGHTER, REL_AUNT}, // Grandmother to daughter is aunt

    // Great - grandparent relationships
    {REL_GRANDFATHER, REL_FATHER, REL_GREAT_GRANDFATHER},                   // Grandfather's father is great - grandfather
    {REL_GRANDFATHER, REL_MOTHER, REL_GREAT_GRANDMOTHER},                   // Grandfather's mother is great - grandmother
    {REL_GRANDMOTHER, REL_FATHER, REL_GREAT_GRANDFATHER},                   // Grandmother's father is great - grandfather
    {REL_GRANDMOTHER, REL_MOTHER, REL_GREAT_GRANDMOTHER},                   // Grandmother's mother is great - grandmother
    {REL_MATERNAL_GRANDFATHER, REL_FATHER, REL_MATERNAL_GREAT_GRANDFATHER}, // Maternal grandfather's father is maternal great - grandfather
    {REL_MATERNAL_GRANDFATHER, REL_MOTHER, REL_MATERNAL_GREAT_GRANDMOTHER}, // Maternal grandfather's mother is maternal great - grandmother
    {REL_MATERNAL_GRANDMOTHER, REL_FATHER, REL_MATERNAL_GREAT_GRANDFATHER}, // Maternal grandmother's father is maternal great - grandfather
    {REL_MATERNAL_GRANDMOTHER, REL_MOTHER, REL_MATERNAL_GREAT_GRANDMOTHER}, // Maternal grandmother's mother is maternal great - grandmother

    // Sibling relationships
    {REL_ELDER_BROTHER, REL_FATHER, REL_FATHER},             
    {REL_ELDER_BROTHER, REL_MOTHER, REL_MOTHER},             
    {REL_YOUNGER_BROTHER, REL_FATHER, REL_FATHER},          // Younger brother to father remains father
    {REL_YOUNGER_BROTHER, REL_MOTHER, REL_MOTHER},          // Younger brother to mother remains younger brother
    {REL_ELDER_SISTER, REL_FATHER, REL_ELDER_SISTER},                // Elder sister to father remains elder sister
    {REL_ELDER_SISTER, REL_MOTHER, REL_ELDER_SISTER},                // Elder sister to mother remains elder sister
    {REL_YOUNGER_SISTER, REL_FATHER, REL_YOUNGER_SISTER},            // Younger sister to father remains younger sister
    {REL_YOUNGER_SISTER, REL_MOTHER, REL_YOUNGER_SISTER},            // Younger sister to mother remains younger sister
    {REL_ELDER_BROTHER, REL_ELDER_BROTHER, REL_ELDER_BROTHER},       // Elder brother to elder brother remains elder brother
    {REL_ELDER_BROTHER, REL_YOUNGER_BROTHER, REL_YOUNGER_BROTHER},   // Elder brother to younger brother remains elder brother
    {REL_YOUNGER_BROTHER, REL_ELDER_BROTHER, REL_ELDER_BROTHER},     // Younger brother to elder brother remains younger brother
    {REL_YOUNGER_BROTHER, REL_YOUNGER_BROTHER, REL_YOUNGER_BROTHER}, // Younger brother to younger brother remains younger brother
    {REL_ELDER_SISTER, REL_ELDER_SISTER, REL_ELDER_SISTER},          // Elder sister to elder sister remains elder sister
    {REL_ELDER_SISTER, REL_YOUNGER_SISTER, REL_ELDER_SISTER},        // Elder sister to younger sister remains elder sister
    {REL_YOUNGER_SISTER, REL_ELDER_SISTER, REL_YOUNGER_SISTER},      // Younger sister to elder sister remains younger sister
    {REL_YOUNGER_SISTER, REL_YOUNGER_SISTER, REL_YOUNGER_SISTER},    // Younger sister to younger sister remains younger sister

    // Spouse relationships
    {REL_WIFE, REL_HUSBAND, REL_SELF},    
    {REL_HUSBAND, REL_WIFE, REL_SELF}, 

    // Uncle and aunt relationships
    {REL_FATHER, REL_ELDER_BROTHER, REL_UNCLE},            // Father's elder brother is uncle
    {REL_FATHER, REL_YOUNGER_BROTHER, REL_UNCLE},          // Father's younger brother is uncle
    {REL_FATHER, REL_ELDER_SISTER, REL_AUNT},              // Father's elder sister is aunt
    {REL_FATHER, REL_YOUNGER_SISTER, REL_AUNT},            // Father's younger sister is aunt
    {REL_MOTHER, REL_ELDER_BROTHER, REL_MATERNAL_UNCLE},   // Mother's elder brother is maternal uncle
    {REL_MOTHER, REL_YOUNGER_BROTHER, REL_MATERNAL_UNCLE}, // Mother's younger brother is maternal uncle
    {REL_MOTHER, REL_ELDER_SISTER, REL_MATERNAL_AUNT},     // Mother's elder sister is maternal aunt
    {REL_MOTHER, REL_YOUNGER_SISTER, REL_MATERNAL_AUNT},   // Mother's younger sister is maternal aunt
    {REL_UNCLE, REL_SON, REL_COUSIN_MALE},                 // Uncle to son is male cousin
    {REL_UNCLE, REL_DAUGHTER, REL_COUSIN_FEMALE},          // Uncle to daughter is female cousin
    {REL_AUNT, REL_SON, REL_COUSIN_MALE},                  // Aunt to son is male cousin
    {REL_AUNT, REL_DAUGHTER, REL_COUSIN_FEMALE},           // Aunt to daughter is female cousin
    {REL_MATERNAL_UNCLE, REL_SON, REL_COUSIN_MALE},        // Maternal uncle to son is male cousin
    {REL_MATERNAL_UNCLE, REL_DAUGHTER, REL_COUSIN_FEMALE}, // Maternal uncle to daughter is female cousin
    {REL_MATERNAL_AUNT, REL_SON, REL_COUSIN_MALE},         // Maternal aunt to son is male cousin
    {REL_MATERNAL_AUNT, REL_DAUGHTER, REL_COUSIN_FEMALE},  // Maternal aunt to daughter is female cousin

    // Cousin relationships
    {REL_COUSIN_MALE, REL_FATHER, REL_COUSIN_MALE},     // Male cousin to father remains male cousin
    {REL_COUSIN_MALE, REL_MOTHER, REL_COUSIN_MALE},     // Male cousin to mother remains male cousin
    {REL_COUSIN_FEMALE, REL_FATHER, REL_COUSIN_FEMALE}, // Female cousin to father remains female cousin
    {REL_COUSIN_FEMALE, REL_MOTHER, REL_COUSIN_FEMALE}, // Female cousin to mother remains female cousin

    // Great - uncle and great - aunt relationships
    {REL_GRANDFATHER, REL_ELDER_BROTHER, REL_GREAT_UNCLE},                 // Grandfather's elder brother is great - uncle
    {REL_GRANDFATHER, REL_YOUNGER_BROTHER, REL_GREAT_UNCLE},               // Grandfather's younger brother is great - uncle
    {REL_GRANDFATHER, REL_ELDER_SISTER, REL_GREAT_AUNT},                   // Grandfather's elder sister is great - aunt
    {REL_GRANDFATHER, REL_YOUNGER_SISTER, REL_GREAT_AUNT},                 // Grandfather's younger sister is great - aunt
    {REL_GREAT_UNCLE, REL_SON, REL_FIRST_COUSIN_ONCE_REMOVED_MALE},        // Great - uncle to son is male first cousin once removed
    {REL_GREAT_UNCLE, REL_DAUGHTER, REL_FIRST_COUSIN_ONCE_REMOVED_FEMALE}, // Great - uncle to daughter is female first cousin once removed
    {REL_GREAT_AUNT, REL_SON, REL_FIRST_COUSIN_ONCE_REMOVED_MALE},         // Great - aunt to son is male first cousin once removed
    {REL_GREAT_AUNT, REL_DAUGHTER, REL_FIRST_COUSIN_ONCE_REMOVED_FEMALE},  // Great - aunt to daughter is female first cousin once removed

    // Second - cousin relationships
    {REL_FIRST_COUSIN_ONCE_REMOVED_MALE, REL_SON, REL_SECOND_COUSIN_MALE},          // Male first cousin once removed to son is male second cousin
    {REL_FIRST_COUSIN_ONCE_REMOVED_MALE, REL_DAUGHTER, REL_SECOND_COUSIN_FEMALE},   // Male first cousin once removed to daughter is female second cousin
    {REL_FIRST_COUSIN_ONCE_REMOVED_FEMALE, REL_SON, REL_SECOND_COUSIN_MALE},        // Female first cousin once removed to son is male second cousin
    {REL_FIRST_COUSIN_ONCE_REMOVED_FEMALE, REL_DAUGHTER, REL_SECOND_COUSIN_FEMALE}, // Female first cousin once removed to daughter is female second cousin

    // Nephew and niece relationships
    {REL_ELDER_BROTHER, REL_SON, REL_NEPHEW},       // Elder brother to son is nephew
    {REL_ELDER_BROTHER, REL_DAUGHTER, REL_NIECE},   // Elder brother to daughter is niece
    {REL_YOUNGER_BROTHER, REL_SON, REL_NEPHEW},     // Younger brother to son is nephew
    {REL_YOUNGER_BROTHER, REL_DAUGHTER, REL_NIECE}, // Younger brother to daughter is niece
    {REL_ELDER_SISTER, REL_SON, REL_NEPHEW},        // Elder sister to son is nephew
    {REL_ELDER_SISTER, REL_DAUGHTER, REL_NIECE},    // Elder sister to daughter is niece
    {REL_YOUNGER_SISTER, REL_SON, REL_NEPHEW},      // Younger sister to son is nephew
    {REL_YOUNGER_SISTER, REL_DAUGHTER, REL_NIECE},  // Younger sister to daughter is niece

    {REL_SELF, REL_SON_IN_LAW, REL_SON_IN_LAW},                   // Self to son - in - law is son - in - law
    {REL_SELF, REL_DAUGHTER_IN_LAW, REL_DAUGHTER_IN_LAW},         // Self to daughter - in - law is daughter - in - law
    {REL_SELF, REL_GRANDSON, REL_GRANDSON},                       // Self to grandson is grandson
    {REL_SELF, REL_GRANDDAUGHTER, REL_GRANDDAUGHTER},             // Self to granddaughter is granddaughter
    {REL_SELF, REL_GREAT_GRANDSON, REL_GREAT_GRANDSON},           // Self to great - grandson is great - grandson
    {REL_SELF, REL_GREAT_GRANDDAUGHTER, REL_GREAT_GRANDDAUGHTER}, // Self to great - granddaughter is great - granddaughter

    {REL_SON, REL_SON, REL_GRANDSON},                // Son to son is grandson
    {REL_SON, REL_DAUGHTER, REL_GRANDDAUGHTER},      // Son to daughter is granddaughter
    {REL_DAUGHTER, REL_SON, REL_GRANDSON},           // Daughter to son is grandson
    {REL_DAUGHTER, REL_DAUGHTER, REL_GRANDDAUGHTER}, // Daughter to daughter is granddaughter

    {REL_GRANDSON, REL_FATHER, REL_SON},           // Grandson to father is son
    {REL_GRANDSON, REL_MOTHER, REL_DAUGHTER_IN_LAW},      // Grandson to mother is daughter
    {REL_GRANDDAUGHTER, REL_FATHER, REL_SON},      // Granddaughter to father is son
    {REL_GRANDDAUGHTER, REL_MOTHER, REL_DAUGHTER_IN_LAW}, // Granddaughter to mother is daughter

    {REL_SON_IN_LAW, REL_HUSBAND, REL_SON},        // Son - in - law to husband is son
    {REL_DAUGHTER_IN_LAW, REL_WIFE, REL_DAUGHTER}, // Daughter - in - law to wife is daughter

    {REL_GRANDSON, REL_SON, REL_GREAT_GRANDSON},                // Grandson to son is great - grandson
    {REL_GRANDDAUGHTER, REL_DAUGHTER, REL_GREAT_GRANDDAUGHTER}, // Granddaughter to daughter is great - granddaughter

    // Newly added other junior - generation relationships
    {REL_SON, REL_SON, REL_GRANDSON},                // Son to son is grandson
    {REL_SON, REL_DAUGHTER, REL_GRANDDAUGHTER},      // Son to daughter is granddaughter
    {REL_DAUGHTER, REL_SON, REL_GRANDSON},           // Daughter to son is grandson
    {REL_DAUGHTER, REL_DAUGHTER, REL_GRANDDAUGHTER}, // Daughter to daughter is granddaughter

    {REL_NEPHEW, REL_SON, REL_GRAND_NEPHEW},     // Nephew to son is grand - nephew
    {REL_NEPHEW, REL_DAUGHTER, REL_GRAND_NIECE}, // Nephew to daughter is grand - niece
    {REL_NIECE, REL_SON, REL_GRAND_NEPHEW},      // Niece to son is grand - nephew
    {REL_NIECE, REL_DAUGHTER, REL_GRAND_NIECE},  // Niece to daughter is grand - niece

    {REL_COUSIN_MALE, REL_SON, REL_COUSIN_SON},             // Male cousin to son is cousin - son
    {REL_COUSIN_MALE, REL_DAUGHTER, REL_COUSIN_DAUGHTER},   // Male cousin to daughter is cousin - daughter
    {REL_COUSIN_FEMALE, REL_SON, REL_COUSIN_SON},           // Female cousin to son is cousin - son
    {REL_COUSIN_FEMALE, REL_DAUGHTER, REL_COUSIN_DAUGHTER}, // Female cousin to daughter is cousin - daughter

    {REL_SON, REL_WIFE, REL_SON_IN_LAW},              // Son to wife is son - in - law
    {REL_DAUGHTER, REL_HUSBAND, REL_DAUGHTER_IN_LAW}, // Daughter to husband is daughter - in - law

    {REL_SON_IN_LAW, REL_FATHER, REL_SON},           // Son - in - law to father is son
    {REL_DAUGHTER_IN_LAW, REL_FATHER, REL_DAUGHTER}, // Daughter - in - law to father is daughter

    {REL_NULL, REL_NULL, REL_NULL} // End marker
};

static const char *relation_names[] = {
    "自己",          // REL_SELF
    "父亲",          // REL_FATHER
    "母亲",          // REL_MOTHER
    "儿子",          // REL_SON
    "女儿",          // REL_DAUGHTER
    "妻子",          // REL_WIFE
    "丈夫",          // REL_HUSBAND
    "哥哥",          // REL_ELDER_BROTHER
    "弟弟",          // REL_YOUNGER_BROTHER
    "姐姐",          // REL_ELDER_SISTER
    "妹妹",          // REL_YOUNGER_SISTER
    "祖父",          // REL_GRANDFATHER
    "祖母",          // REL_GRANDMOTHER
    "伯父",          // REL_UNCLE
    "姑母",          // REL_AUNT
    "堂兄弟",        // REL_COUSIN_MALE
    "堂姐妹",        // REL_COUSIN_FEMALE
    "曾祖父",        // REL_GREAT_GRANDFATHER
    "曾祖母",        // REL_GREAT_GRANDMOTHER
    "外祖父",        // REL_MATERNAL_GRANDFATHER
    "外祖母",        // REL_MATERNAL_GRANDMOTHER
    "外曾祖父",      // REL_MATERNAL_GREAT_GRANDFATHER
    "外曾祖母",      // REL_MATERNAL_GREAT_GRANDMOTHER
    "表侄",          // REL_FIRST_COUSIN_ONCE_REMOVED_MALE
    "表侄女",        // REL_FIRST_COUSIN_ONCE_REMOVED_FEMALE
    "再从兄弟",      // REL_SECOND_COUSIN_MALE
    "再从姐妹",      // REL_SECOND_COUSIN_FEMALE
    "叔祖父",        // REL_GREAT_UNCLE
    "姑祖母",        // REL_GREAT_AUNT
    "舅父",          // REL_MATERNAL_UNCLE
    "姨母",          // REL_MATERNAL_AUNT
    "侄子",          // REL_NEPHEW
    "侄女",          // REL_NIECE
    "儿媳",          // REL_SON_IN_LAW
    "女婿",          // REL_DAUGHTER_IN_LAW
    "孙子",          // REL_GRANDSON
    "孙女",          // REL_GRANDDAUGHTER
    "曾孙子",        // REL_GREAT_GRANDSON
    "曾孙女",        // REL_GREAT_GRANDDAUGHTER
    "堂侄/表侄",     // REL_COUSIN_SON
    "堂侄女/表侄女", // REL_COUSIN_DAUGHTER
    "孙侄",          // REL_GRAND_NEPHEW
    "孙侄女",        // REL_GRAND_NIECE
    "未知"           // REL_NULL
};

static const btnm_relation_t btnm_relation[] = {
    {"父亲", REL_FATHER, GENDER_MALE},
    {"母亲", REL_MOTHER, GENDER_FEMALE},
    {"丈夫", REL_HUSBAND, GENDER_MALE},
    {"妻子", REL_WIFE, GENDER_FEMALE},
    {"儿子", REL_SON, GENDER_MALE},
    {"女儿", REL_DAUGHTER, GENDER_FEMALE},
    {"哥哥", REL_ELDER_BROTHER, GENDER_MALE},
    {"弟弟", REL_YOUNGER_BROTHER, GENDER_MALE},
    {"姐姐", REL_ELDER_SISTER, GENDER_FEMALE},
    {"妹妹", REL_YOUNGER_SISTER, GENDER_FEMALE}
};

static const char *btnm_map[] = {
    "父亲", "丈夫", "儿子", "哥哥", "姐姐", "<-", "清除", "\n",
    "母亲", "妻子", "女儿", "弟弟", "妹妹", " ", "计算", ""
};

static void rel_cal_main_page(void);
static void rel_cal_btnmatrix_event_cb(lv_event_t *e);
static void rel_transform_handle(const uint8_t id, const char *text);
static const char *calculate_relationship(relation_cal_t *self);

void relation_cal_app_create(void)
{
#ifdef CONFIG_ESP32S3_BOX_LCD
    LV_FONT_DECLARE(lv_font_siyuan_10);

    g_rel_cal.fonts.siyuan = &lv_font_siyuan_10;
#else
    LV_FONT_DECLARE(lv_font_siyuan_16);

    g_rel_cal.fonts.siyuan = &lv_font_siyuan_16;
#endif

    if (NULL == g_rel_cal.fonts.siyuan)
    {
        return;
    }

    g_rel_cal.rel_count = 0;
    rel_cal_main_page();
}

static void rel_cal_main_page(void)
{
    lv_obj_t *root = lv_obj_create(lv_scr_act());
    lv_obj_remove_style_all(root);
    lv_obj_center(root);
    lv_obj_set_style_bg_color(root, lv_color_white(), 0);
    lv_obj_align(root, LV_ALIGN_CENTER, 0, 0);
    lv_obj_set_size(root, DEMO_WIDTH, DEMO_HEIGHT);
    lv_obj_set_flex_flow(root, LV_FLEX_FLOW_COLUMN);
    lv_obj_set_scrollbar_mode(root, LV_SCROLLBAR_MODE_OFF);
    lv_obj_clear_flag(root, LV_OBJ_FLAG_SCROLLABLE);

    g_rel_cal.ui.title = lv_label_create(root);
    lv_obj_set_size(g_rel_cal.ui.title, DEMO_WIDTH, DEMO_TITLE_HEIGHT);
    lv_label_set_text(g_rel_cal.ui.title, "亲属关系计算器");
    lv_obj_set_style_text_font(g_rel_cal.ui.title, g_rel_cal.fonts.siyuan, LV_PART_MAIN);
    lv_obj_set_style_text_color(g_rel_cal.ui.title, lv_color_hex(0x2C3E50), 0);
    lv_obj_set_style_text_align(g_rel_cal.ui.title, LV_TEXT_ALIGN_CENTER, 0);
    lv_obj_set_style_pad_top(g_rel_cal.ui.title, 10, 0);
    lv_obj_set_style_text_color(g_rel_cal.ui.title, lv_color_hex(0xFFA500), 0);

    g_rel_cal.ui.screen = lv_textarea_create(root);
    lv_obj_set_size(g_rel_cal.ui.screen, LV_PCT(100), LV_PCT(40));

    lv_obj_set_style_text_font(g_rel_cal.ui.screen, g_rel_cal.fonts.siyuan, LV_PART_MAIN);

    lv_obj_set_style_bg_color(g_rel_cal.ui.screen, lv_color_hex(0x2C3E50), 0);
    lv_obj_set_style_text_color(g_rel_cal.ui.screen, lv_color_white(), 0);
    lv_obj_set_style_radius(g_rel_cal.ui.screen, 20, 0);
    lv_obj_set_style_pad_all(g_rel_cal.ui.screen, 15, 0);
    lv_textarea_set_cursor_click_pos(g_rel_cal.ui.screen, false);
    lv_textarea_set_max_length(g_rel_cal.ui.screen, 128);
    lv_textarea_set_align(g_rel_cal.ui.screen, LV_TEXT_ALIGN_LEFT);
    lv_textarea_set_text(g_rel_cal.ui.screen, "");

    g_rel_cal.ui.btnm = lv_btnmatrix_create(root);
    lv_obj_set_style_border_width(g_rel_cal.ui.btnm, 0, 0);
    lv_obj_set_size(g_rel_cal.ui.btnm, LV_PCT(100), LV_PCT(40));

    lv_obj_set_style_text_font(g_rel_cal.ui.btnm, g_rel_cal.fonts.siyuan, LV_PART_MAIN);

    lv_buttonmatrix_set_map(g_rel_cal.ui.btnm, btnm_map);
    lv_obj_add_event_cb(g_rel_cal.ui.btnm, rel_cal_btnmatrix_event_cb, LV_EVENT_VALUE_CHANGED, root);
    lv_obj_set_style_bg_color(g_rel_cal.ui.btnm, lv_color_hex(0xECF0F1), 0);
    lv_obj_set_style_radius(g_rel_cal.ui.btnm, 10, 0);
    lv_obj_set_style_pad_all(g_rel_cal.ui.btnm, 10, 0);

    g_rel_cal.ui.note = lv_label_create(root);
    lv_obj_set_size(g_rel_cal.ui.note, LV_PCT(100), LV_PCT(10));
    lv_label_set_text(g_rel_cal.ui.note, "这是一个亲属关系计算器。未支持关系：“未知”。");

    lv_obj_set_style_text_font(g_rel_cal.ui.note, g_rel_cal.fonts.siyuan, LV_PART_MAIN);

    lv_obj_set_style_text_color(g_rel_cal.ui.note, lv_color_hex(0x7F8C8D), 0);
    lv_obj_set_style_text_align(g_rel_cal.ui.note, LV_TEXT_ALIGN_CENTER, 0);
}

static void rel_cal_btnmatrix_event_cb(lv_event_t *e)
{
    lv_obj_t *obj = lv_event_get_target(e);
    uint8_t id = lv_buttonmatrix_get_selected_button(obj);
    const char *text = lv_buttonmatrix_get_button_text(obj, id);

    rel_transform_handle(id, text);
}

static void rel_transform_handle(const uint8_t id, const char *text)
{
    static btnm_relation_t last_input = {"?", REL_NULL, GENDER_UNKNOWN};

    if (g_rel_cal.status == STATUS_CALCULATED)
    {
        g_rel_cal.status = STATUS_INPUTTING;
        lv_textarea_set_text(g_rel_cal.ui.screen, "");
    }

    switch (id)
    {
    case CALCULATED:
        if (g_rel_cal.rel_count > 0)
        {
            const char *result = calculate_relationship(&g_rel_cal);
            lv_textarea_set_text(g_rel_cal.ui.screen, result);
            g_rel_cal.rel_count = 0;
        }
        else
        {
            lv_textarea_set_text(g_rel_cal.ui.screen, "自己");
            g_rel_cal.rel_count = 0;
        }
        g_rel_cal.status = STATUS_CALCULATED;
        last_input.relation = REL_NULL;
        last_input.gender = GENDER_UNKNOWN;

        break;

    case CLEAR:
        lv_textarea_set_text(g_rel_cal.ui.screen, "");
        g_rel_cal.rel_count = 0;

        last_input.relation = REL_NULL;
        last_input.gender = GENDER_UNKNOWN;
        break;

    case DELETE:
        if (g_rel_cal.rel_count)
        {
            g_rel_cal.rel_count--;
            lv_textarea_delete_char(g_rel_cal.ui.screen);
            lv_textarea_delete_char(g_rel_cal.ui.screen);
            lv_textarea_delete_char(g_rel_cal.ui.screen);
        }
        break;

    case MY_NULL:
        break;

    default:
        for (int i = 0; i < sizeof(btnm_relation) / sizeof(btnm_relation[0]); i++)
        {
            if (0 == strcmp(text, btnm_relation[i].btnm_text))
            {
                if ((GENDER_FEMALE == last_input.gender &&
                     REL_WIFE == btnm_relation[i].relation) ||
                    (GENDER_MALE == last_input.gender &&
                     REL_HUSBAND == btnm_relation[i].relation))
                {
                    return;
                }
                if (g_rel_cal.rel_count < MAX_REL_LEN)
                {
                    g_rel_cal.rel_list[g_rel_cal.rel_count++] = btnm_relation[i].relation;
                }

                last_input = btnm_relation[i];
                break;
            }
        }

        if (g_rel_cal.rel_count == 1)
        {
            lv_textarea_add_text(g_rel_cal.ui.screen, text);
        }
        else if (g_rel_cal.rel_count > 1)
        {
            lv_textarea_add_text(g_rel_cal.ui.screen, "的");
            lv_textarea_add_text(g_rel_cal.ui.screen, text);
        }

        break;
    }
}

static const char *calculate_relationship(relation_cal_t *self)
{
    relation_type_t current = REL_SELF;
    for (int i = 0; i < self->rel_count; i++)
    {
        int found = 0;
        for (int j = 0; transitions[j].from != REL_NULL; j++)
        {
            if (transitions[j].from == current && transitions[j].to == self->rel_list[i])
            {
                current = transitions[j].result;
                found = 1;
                break;
            }
        }
        if (!found)
        {
            current = REL_NULL;
            break;
        }
    }

    return relation_names[current];
}