/* app/reader_conf.c — 阅读器 App 私有配置实现（见 app/reader_conf.h）。 */
#include "reader_conf.h"
#include "meow_ui.h"        /* meow_config_dir() */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>

/* 从 MEOW_DATA_DIR（<TF>/MeowData/<pkg>/data）剥掉尾 "/data"，得到 <TF>/MeowData/<pkg>。 */
static void strip_data_suffix(const char *d, char *out, int outsz)
{
    if (!d || !d[0]) { strncpy(out, "/tmp", (size_t)outsz - 1); out[outsz - 1] = 0; return; }
    size_t n = strlen(d);
    const char *suffix = "/data";
    size_t sl = strlen(suffix);
    size_t keep;
    if (n >= sl && strcmp(d + n - sl, suffix) == 0) keep = n - sl;
    else keep = n;
    if (keep >= (size_t)outsz) keep = (size_t)outsz - 1;
    memcpy(out, d, keep);
    out[keep] = 0;
}

static void conf_path(char *out, int outsz)
{
    const char *data = meow_config_dir();
    char base[360];
    strip_data_suffix(data ? data : "", base, sizeof base);
    if (snprintf(out, (size_t)outsz, "%s/reader.conf", base) >= outsz) out[0] = 0;
    /* mkdir -p base */
    char tmp[400];
    strncpy(tmp, base, sizeof tmp - 1); tmp[sizeof tmp - 1] = 0;
    for (char *p = tmp + 1; *p; p++) {
        if (*p == '/') { *p = 0; mkdir(tmp, 0755); *p = '/'; }
    }
    mkdir(tmp, 0755);
}

static void conf_defaults(rdconf *c)
{
    c->fs = 20;
    c->ls = 130;
    strcpy(c->bg, "black");          /* B 定案：默认纯黑 */
    strcpy(c->theme, "auto");
    strcpy(c->shelf, "list");        /* A 定案：默认 list */
    c->header = 1;
    c->footer = 1;
    c->font[0] = 0;
}

static void clamp_str(char *v, size_t sz)
{
    v[sz - 1] = 0;
}

rdconf *rdconf_get(void)
{
    static rdconf g;
    static int loaded = 0;
    if (loaded) return &g;
    conf_defaults(&g);
    char path[440];
    conf_path(path, sizeof path);
    FILE *f = path[0] ? fopen(path, "r") : NULL;
    if (f) {
        char line[512];
        while (fgets(line, sizeof line, f)) {
            line[strcspn(line, "\r\n")] = 0;
            char *eq = strchr(line, '=');
            if (!eq) continue;
            *eq = 0;
            const char *k = line, *v = eq + 1;
            if (!strcmp(k, "ui.shelf_layout")) { strncpy(g.shelf, v, sizeof g.shelf - 1); g.shelf[sizeof g.shelf - 1] = 0; }
            else if (!strcmp(k, "rd.fs")) { int t = atoi(v); if (t >= 14 && t <= 40) g.fs = t; }
            else if (!strcmp(k, "rd.ls")) { int t = atoi(v); if (t >= 100 && t <= 200) g.ls = t; }
            else if (!strcmp(k, "rd.bg")) { strncpy(g.bg, v, sizeof g.bg - 1); g.bg[sizeof g.bg - 1] = 0; }
            else if (!strcmp(k, "rd.theme")) { strncpy(g.theme, v, sizeof g.theme - 1); g.theme[sizeof g.theme - 1] = 0; }
            else if (!strcmp(k, "rd.header")) { g.header = atoi(v) ? 1 : 0; }
            else if (!strcmp(k, "rd.footer")) { g.footer = atoi(v) ? 1 : 0; }
            else if (!strcmp(k, "rd.font")) { strncpy(g.font, v, sizeof g.font - 1); g.font[sizeof g.font - 1] = 0; }
        }
        fclose(f);
    }
    /* 校验合法取值（越界回默认/回退），避免脏档破坏 UI */
    if (strcmp(g.shelf, "grid") && strcmp(g.shelf, "list")) strcpy(g.shelf, "list");
    if (strcmp(g.bg, "black") && strcmp(g.bg, "white") &&
        strcmp(g.bg, "sepia") && strcmp(g.bg, "auto")) strcpy(g.bg, "black");
    if (strcmp(g.theme, "light") && strcmp(g.theme, "dark") &&
        strcmp(g.theme, "auto")) strcpy(g.theme, "auto");
    clamp_str(g.shelf, sizeof g.shelf);
    clamp_str(g.bg, sizeof g.bg);
    clamp_str(g.theme, sizeof g.theme);
    clamp_str(g.font, sizeof g.font);
    loaded = 1;
    return &g;
}

int rdconf_persist(void)
{
    rdconf *c = rdconf_get();
    char path[440];
    conf_path(path, sizeof path);
    if (!path[0]) return -1;
    FILE *f = fopen(path, "wb");
    if (!f) return -5;
    fprintf(f, "ui.shelf_layout=%s\n", c->shelf);
    fprintf(f, "rd.fs=%d\n", c->fs);
    fprintf(f, "rd.ls=%d\n", c->ls);
    fprintf(f, "rd.bg=%s\n", c->bg);
    fprintf(f, "rd.theme=%s\n", c->theme);
    fprintf(f, "rd.header=%d\n", c->header);
    fprintf(f, "rd.footer=%d\n", c->footer);
    fprintf(f, "rd.font=%s\n", c->font);
    fclose(f);
    return 0;
}