Ben / moon

#include "files_screen.h"
#include "../topbar.h"
#include "../storage.h"
#include "../audio_player.h"
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <ctype.h>

#define MAX_ENTRIES 256

// Case-insensitive extension check helper
static bool ext_match(const char *ext, const char *pattern) {
	while (*pattern) {
		if ((tolower(*ext++) != tolower(*pattern++))) {
			return false;
		}
	}
	return !(*ext);
}

// Check if filename is a supported audio file
bool is_audio_file(const char *name) {
    size_t len = strlen(name);
    if (len < 4) return false;

    // Find last dot
    const char *dot = strrchr(name, '.');
    if (!dot || dot == name) return false;

    // Check supported extensions
    return ext_match(dot, ".mp3") ||
           ext_match(dot, ".wav") ||
           ext_match(dot, ".aac") ||
           ext_match(dot, ".m4a") ||
           ext_match(dot, ".m4b") ||
           ext_match(dot, ".flac") ||
           ext_match(dot, ".ogg") ||
           ext_match(dot, ".opus");
}

// Get entry at index by re-reading directory (FAT32 is deterministic)
static bool get_entry_at_index(const char *dir, int index, storage_entry_t *out) {
    storage_entry_t *entries = malloc(MAX_ENTRIES * sizeof(storage_entry_t));
    if (!entries) return false;

    int count = storage_list_dir(dir, entries, MAX_ENTRIES);
    bool found = (index >= 0 && index < count);
    if (found) {
        *out = entries[index];
    }
    free(entries);
    return found;
}

// Cancel goes up one directory or to home
static void cancel_event_cb(lv_event_t *e) {
    (void)e;
    files_screen_state_t *state = ui_state.files;
    if (!state) return;

    if (strcmp(state->cwd, "/") != 0) {
        char parent[STORAGE_MAX_PATH];
        char current_dir[STORAGE_MAX_NAME];
        path_parent(state->cwd, parent, sizeof(parent), current_dir, sizeof(current_dir));
        free_screen();
        ui_state = setup_files_screen(parent, current_dir);
    } else {
        navigate_to(SCREEN_HOME);
    }
}

// Back button click - same as cancel
static void back_event_cb(lv_event_t *e) {
    if (lv_event_get_code(e) == LV_EVENT_CLICKED) {
        cancel_event_cb(e);
    }
}

// Entry clicked - index stored in userdata
static void entry_click_cb(lv_event_t *e) {
    if (lv_event_get_code(e) != LV_EVENT_CLICKED) return;

    files_screen_state_t *state = ui_state.files;
    if (!state) return;

    int index = (int)(intptr_t)lv_event_get_user_data(e);

    storage_entry_t entry;
    if (!get_entry_at_index(state->cwd, index, &entry)) return;

    // Build full path
    char path[STORAGE_MAX_PATH];
    bool at_root = (strcmp(state->cwd, "/") == 0);
    int n = snprintf(path, sizeof(path), "%s%s%s",
                     state->cwd,
                     at_root ? "" : "/",
                     entry.name);
    if (n <= 0 || (size_t)n >= sizeof(path)) return;

    if (entry.type == STORAGE_TYPE_DIR) {
        // Navigate into directory
        free_screen();
        ui_state = setup_files_screen(path, "");
    } else if (is_audio_file(entry.name)) {
        // Play audio file
        if (audio_player_play(path)) {
            strncpy(app_state.last_played_path, path, sizeof(app_state.last_played_path));
            app_state.last_played_path[sizeof(app_state.last_played_path) - 1] = '\0';
            navigate_to(SCREEN_PLAYER);
        }
    }
}

const void *storage_entry_get_icon(const storage_entry_t *entry) {
	if (entry->type == STORAGE_TYPE_DIR) {
		return LV_SYMBOL_DIRECTORY;
	}
	if (is_audio_file(entry->name)) {
		return LV_SYMBOL_AUDIO;
	}
	return LV_SYMBOL_FILE;
}

ui_state_t setup_files_screen(const char *cwd, const char *focus_item) {
    files_screen_state_t *state = calloc(1, sizeof(files_screen_state_t));

    // Store current directory (default to "/" if NULL or empty)
    if (cwd && cwd[0] != '\0') {
        strncpy(state->cwd, cwd, sizeof(state->cwd));
        state->cwd[sizeof(state->cwd) - 1] = '\0';
    } else {
        strcpy(state->cwd, "/");
    }

    state->list = bvs_list_create();

    // Set topbar title to directory basename
    const char *basename = strrchr(state->cwd, '/');
    basename = (basename && basename[1]) ? basename + 1 : "Files";
    topbar_set_title(basename);

    lv_obj_t *focus_btn = NULL;
    if (!storage_is_mounted()) {
        lv_obj_t *error = bvs_list_add_button(state->list, LV_SYMBOL_WARNING, "Error reading sd card");
        (void)error;
    } else {
        // List current directory contents
        storage_entry_t *entries = malloc(MAX_ENTRIES * sizeof(storage_entry_t));
        int count = entries ? storage_list_dir(state->cwd, entries, MAX_ENTRIES) : -1;

        if (count < 0) {
            free(entries);
            lv_obj_t *error = bvs_list_add_button(state->list, NULL, "Error reading dir");
            (void)error;
        } else if (count == 0) {
            free(entries);
	    lv_obj_t *empty = bvs_list_add_button(state->list, NULL, "Empty Directory");
            (void)empty;
        } else {
            for (int i = 0; i < count; i++) {
                if (entries[i].name[0] == '.') continue;
                lv_obj_t *btn = bvs_list_add_button(state->list, NULL, entries[i].name);
                // Store index as userdata, use single callback for all entries
                lv_obj_add_event_cb(btn, entry_click_cb, LV_EVENT_CLICKED, (void*)(intptr_t)i);
                lv_obj_add_event_cb(btn, cancel_event_cb, LV_EVENT_CANCEL, NULL);
                lv_group_add_obj(lv_group_get_default(), btn);

                if (!focus_btn) {
                    focus_btn = btn;
                }

                // Check if this is the item to focus
                if (focus_item && focus_item[0] != '\0' &&
                    strcmp(entries[i].name, focus_item) == 0) {
                    focus_btn = btn;
                }
            }
            free(entries);
        }
    }

    // Add Back button
    lv_obj_t *back_btn = bvs_list_add_button(state->list, NULL, "Back");
    lv_obj_add_event_cb(back_btn, back_event_cb, LV_EVENT_CLICKED, NULL);
    lv_obj_add_event_cb(back_btn, cancel_event_cb, LV_EVENT_CANCEL, NULL);
    lv_group_add_obj(lv_group_get_default(), back_btn);

    // Focus: requested item > first entry > back button
    if (focus_btn) {
        lv_group_focus_obj(focus_btn);
    } else {
        lv_group_focus_obj(back_btn);
    }

    return (ui_state_t){.type = SCREEN_FILES, .files = state};
}

void free_files_screen(files_screen_state_t *state) {
    if (!state) return;

    bvs_list_clear(state->list);
    free(state);
}

void update_files_screen(files_screen_state_t *state) {
    (void)state;  // LVGL handles updates via timer
}