//
//  KBSkinService.m
//  keyBoard
//

#import "KBSkinService.h"

#import "KBSkinManager.h"
#import "KBConfig.h"
#import "KBKeyboardPermissionManager.h"
#import "KBNetworkManager.h"
#import "KBHUD.h"

#if __has_include(<SSZipArchive/SSZipArchive.h>)
#import <SSZipArchive/SSZipArchive.h>
#endif

@implementation KBSkinService

#pragma mark - Icon short-name mapping (local default)

/// 本地维护的一份“逻辑按键标识 -> 图标短文件名”映射表。
/// - 若后端 skinJSON 未提供 key_icons，则远程 Zip 模式会回退使用本表；仅依赖 zip_url + 命名规范即可。
+ (NSDictionary<NSString *, NSString *> *)kb_defaultIconShortNames {
    static NSDictionary<NSString *, NSString *> *map;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        // 从配置文件加载映射，避免在代码里维护大段字面量。
        // 使用 .strings 形式，便于为每个键添加注释。
        NSString *path = [[NSBundle mainBundle] pathForResource:@"KBSkinIconMap" ofType:@"strings"];
        if (path.length > 0) {
            NSDictionary *dict = [NSDictionary dictionaryWithContentsOfFile:path];
            if ([dict isKindOfClass:NSDictionary.class]) {
                map = dict;
            }
        }
        if (!map) {
            map = @{}; // 防御：配置缺失时返回空表，避免崩溃
        }
    });
    return map;
}

+ (instancetype)shared {
    static KBSkinService *s; static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{ s = [KBSkinService new]; });
    return s;
}

- (void)applySkinWithJSON:(NSDictionary *)skinJSON
         fromViewController:(UIViewController *)presenting
                      mode:(KBSkinSourceMode)mode
                 completion:(KBSkinApplyCompletion)completion {
    if (skinJSON.count == 0) {
        if (completion) completion(NO);
        return;
    }

//    // 1. 点击应用皮肤时，检查键盘启用 & 完全访问状态，并尽量给出友好提示。
//    KBKeyboardPermissionManager *perm = [KBKeyboardPermissionManager shared];
//    BOOL enabled = [perm isKeyboardEnabled];
//    KBFARecord fa = [perm lastKnownFullAccess];
//    BOOL hasFullAccess = (fa == KBFARecordGranted);
//
//    if (!enabled || !hasFullAccess) {
//        // 引导页（内部有自己的展示策略，避免过度打扰）
//        [perm presentPermissionIfNeededFrom:presenting];
//
//        // 简单提示：皮肤可以应用，但未开启完全访问时扩展无法读取 App Group 中的图片。
//        [KBHUD showInfo:KBLocalized(@"皮肤已应用，键盘需开启“允许完全访问”后才能显示图片")];
//    }

    switch (mode) {
        case KBSkinSourceModeLocalBundleZip:
            // 本地 bundle 模式：zip_url 为 bundle 内的 zip 文件名
            [self kb_applySkinUsingLocalBundle:skinJSON completion:completion];
            break;
        case KBSkinSourceModeRemoteZip:
        default:
            // 远程模式：zip_url 为 http/https 地址
            [self kb_applySkinUsingRemoteIcons:skinJSON completion:completion];
            break;
    }
}

/// 远程 Zip 模式：skinJSON 提供 zip_url，一套皮肤一个压缩包。
/// - Zip 解压路径：AppGroup/Skins/<skinId>/...
///   * 图标：icons/<shortName>.png，例如 icons/key_a.png
///   * 背景：background.png（可选）
/// - skinJSON.key_icons 的 value 填写 Zip 内的图标“短文件名”（不含路径，可不含扩展名），例如 "key_a"
///   应用时会被转换为相对 App Group 根目录的路径：Skins/<skinId>/icons/<shortName>.png
- (void)kb_applySkinUsingRemoteIcons:(NSDictionary *)skin completion:(KBSkinApplyCompletion)completion {
    NSString *skinId = skin[@"id"] ?: @"remote";
    NSString *name = skin[@"name"] ?: skinId;
    NSString *zipURL = skin[@"zip_url"] ?: @""; // 新协议：远程 Zip 包地址

    // key_icons 可选：
    // - 若后端提供 key_icons，则优先使用服务端映射；
    // - 若未提供，则回退到本地默认映射（kb_defaultIconShortNames），这样后端只需返回 id/name/zip_url。
    NSDictionary *iconShortNames = nil;
    if ([skin[@"key_icons"] isKindOfClass:NSDictionary.class]) {
        iconShortNames = skin[@"key_icons"];
    } else {
        iconShortNames = [self.class kb_defaultIconShortNames];
    }

    NSURL *containerURL = [[NSFileManager defaultManager] containerURLForSecurityApplicationGroupIdentifier:AppGroup];
    if (!containerURL) {
        if (completion) completion(NO);
        [KBHUD showInfo:KBLocalized(@"无法访问共享容器，应用皮肤失败")];
        return;
    }

    NSString *skinsRoot = [containerURL.path stringByAppendingPathComponent:@"Skins"];
    NSString *skinRoot  = [skinsRoot stringByAppendingPathComponent:skinId];
    NSString *iconsDir  = [skinRoot stringByAppendingPathComponent:@"icons"];
    [[NSFileManager defaultManager] createDirectoryAtPath:iconsDir
                              withIntermediateDirectories:YES
                                               attributes:nil
                                                    error:NULL];

    NSFileManager *fm = [NSFileManager defaultManager];
    BOOL isDir = NO;
    BOOL hasIconsDir = [fm fileExistsAtPath:iconsDir isDirectory:&isDir] && isDir;
    NSArray *contents = hasIconsDir ? [fm contentsOfDirectoryAtPath:iconsDir error:NULL] : nil;
    BOOL hasCachedAssets = (contents.count > 0);

    NSString *bgPath = [skinRoot stringByAppendingPathComponent:@"background.png"];

    dispatch_group_t group = dispatch_group_create();
    __block BOOL zipOK = YES;

#if __has_include(<SSZipArchive/SSZipArchive.h>)
    // 若本地尚未缓存该皮肤资源且提供了 zip_url，则通过网络下载并解压 Zip 包。
    if (!hasCachedAssets && zipURL.length > 0) {
        dispatch_group_enter(group);

        void (^handleZipData)(NSData *) = ^(NSData *data) {
            if (data.length == 0) {
                zipOK = NO;
                dispatch_group_leave(group);
                return;
            }
            // 将 Zip 写入临时路径再解压
            [[NSFileManager defaultManager] createDirectoryAtPath:skinRoot
                                      withIntermediateDirectories:YES
                                                       attributes:nil
                                                            error:NULL];
            NSString *zipPath = [skinRoot stringByAppendingPathComponent:@"skin.zip"];
            if (![data writeToFile:zipPath atomically:YES]) {
                zipOK = NO;
                dispatch_group_leave(group);
                return;
            }

            NSError *unzipError = nil;
            BOOL ok = [SSZipArchive unzipFileAtPath:zipPath
                                       toDestination:skinRoot
                                           overwrite:YES
                                            password:nil
                                               error:&unzipError];
            [fm removeItemAtPath:zipPath error:nil];
            if (!ok || unzipError) {
                zipOK = NO;
                dispatch_group_leave(group);
                return;
            }

            // 兼容“额外包一层目录”的压缩结构：
            // 若 Skins/<skinId>/icons 为空，但存在 Skins/<skinId>/<子目录>/icons，
            // 则将实际 icons 与 background.png 上移到预期位置。
            BOOL isDir2 = NO;
            NSArray *iconsContent = [fm contentsOfDirectoryAtPath:iconsDir error:NULL];
            BOOL iconsValid = ([fm fileExistsAtPath:iconsDir isDirectory:&isDir2] && isDir2 && iconsContent.count > 0);
            if (!iconsValid) {
                NSArray<NSString *> *subItems = [fm contentsOfDirectoryAtPath:skinRoot error:NULL];
                for (NSString *name in subItems) {
                    if ([name isEqualToString:@"icons"] || [name isEqualToString:@"__MACOSX"]) continue;
                    NSString *nestedRoot = [skinRoot stringByAppendingPathComponent:name];
                    BOOL isDirNested = NO;
                    if (![fm fileExistsAtPath:nestedRoot isDirectory:&isDirNested] || !isDirNested) continue;

                    NSString *nestedIcons = [nestedRoot stringByAppendingPathComponent:@"icons"];
                    BOOL isDirNestedIcons = NO;
                    if ([fm fileExistsAtPath:nestedIcons isDirectory:&isDirNestedIcons] && isDirNestedIcons) {
                        NSArray *nestedFiles = [fm contentsOfDirectoryAtPath:nestedIcons error:NULL];
                        if (nestedFiles.count > 0) {
                            // 确保目标 icons 目录存在
                            [fm createDirectoryAtPath:iconsDir
                           withIntermediateDirectories:YES
                                            attributes:nil
                                                 error:NULL];
                            // 将 icons 下所有文件上移一层
                            for (NSString *fn in nestedFiles) {
                                NSString *from = [nestedIcons stringByAppendingPathComponent:fn];
                                NSString *to   = [iconsDir stringByAppendingPathComponent:fn];
                                [fm removeItemAtPath:to error:nil];
                                [fm moveItemAtPath:from toPath:to error:nil];
                            }
                        }
                    }

                    // 处理 background.png：若在子目录下存在，则上移到 skinRoot
                    NSString *nestedBg = [nestedRoot stringByAppendingPathComponent:@"background.png"];
                    if ([fm fileExistsAtPath:nestedBg]) {
                        [fm removeItemAtPath:bgPath error:nil];
                        [fm moveItemAtPath:nestedBg toPath:bgPath error:nil];
                    }
                }
            }
            dispatch_group_leave(group);
        };

        // 远程下载（http/https）
        [[KBNetworkManager shared] GET:zipURL parameters:nil headers:nil completion:^(id jsonOrData, NSURLResponse *response, NSError *error) {
            NSData *data = ([jsonOrData isKindOfClass:NSData.class] ? (NSData *)jsonOrData : nil);
            if (error || data.length == 0) {
                zipOK = NO;
                dispatch_group_leave(group);
                return;
            }
            handleZipData(data);
        }];
    }
#else
    zipOK = NO;
#endif

    dispatch_group_notify(group, dispatch_get_main_queue(), ^{
        // 构造 key_icons -> App Group 相对路径 映射
        NSMutableDictionary<NSString *, NSString *> *iconPathMap = [NSMutableDictionary dictionary];
        [iconShortNames enumerateKeysAndObjectsUsingBlock:^(NSString *identifier, NSString *shortName, BOOL *stop) {
            if (![shortName isKindOfClass:NSString.class] || shortName.length == 0) return;
            NSString *fileName = shortName;
            // 若未带扩展名，默认按 .png 处理
            if (fileName.pathExtension.length == 0) {
                fileName = [fileName stringByAppendingPathExtension:@"png"];
            }
            NSString *relative = [NSString stringWithFormat:@"Skins/%@/icons/%@", skinId, fileName];
            iconPathMap[identifier] = relative;
        }];

        NSMutableDictionary *themeJSON = [skin mutableCopy];
        themeJSON[@"id"] = skinId;
        if (iconPathMap.count > 0) {
            themeJSON[@"key_icons"] = iconPathMap.copy;
        }

        BOOL themeOK = [[KBSkinManager shared] applyThemeFromJSON:themeJSON];

        // 背景图优先从 Zip 解压出的 background.png 读取
        NSData *bgData = [NSData dataWithContentsOfFile:bgPath];
        BOOL ok = themeOK;
        if (bgData.length > 0) {
            ok = [[KBSkinManager shared] applyImageSkinWithData:bgData skinId:skinId name:name];
        }

        if (!zipOK && !hasCachedAssets) {
            ok = NO;
        }

        if (completion) completion(ok);
        [KBHUD showInfo:(ok ? KBLocalized(@"已应用，切到键盘查看") : KBLocalized(@"应用皮肤失败"))];
    });
}

/// 本地 bundle 模式：不走网络，skin[@"zip_url"] 直接为 bundle 内 zip 文件名（可带/不带扩展名）。
/// - 仍然解压到 AppGroup/Skins/<skinId>/...，方便键盘扩展通过 App Group 读取。
- (void)kb_applySkinUsingLocalBundle:(NSDictionary *)skin completion:(KBSkinApplyCompletion)completion {
    NSString *skinId = skin[@"id"] ?: @"local";
    NSString *name = skin[@"name"] ?: skinId;
    NSString *zipName = skin[@"zip_url"] ?: @""; // 本地 bundle 内的 zip 文件名

    // key_icons 逻辑与远程模式保持一致
    NSDictionary *iconShortNames = nil;
    if ([skin[@"key_icons"] isKindOfClass:NSDictionary.class]) {
        iconShortNames = skin[@"key_icons"];
    } else {
        iconShortNames = [self.class kb_defaultIconShortNames];
    }

    NSURL *containerURL = [[NSFileManager defaultManager] containerURLForSecurityApplicationGroupIdentifier:AppGroup];
    if (!containerURL) {
        if (completion) completion(NO);
        [KBHUD showInfo:KBLocalized(@"无法访问共享容器，应用皮肤失败")];
        return;
    }

    NSString *skinsRoot = [containerURL.path stringByAppendingPathComponent:@"Skins"];
    NSString *skinRoot  = [skinsRoot stringByAppendingPathComponent:skinId];
    NSString *iconsDir  = [skinRoot stringByAppendingPathComponent:@"icons"];
    [[NSFileManager defaultManager] createDirectoryAtPath:iconsDir
                              withIntermediateDirectories:YES
                                               attributes:nil
                                                    error:NULL];

    NSFileManager *fm = [NSFileManager defaultManager];
    BOOL isDir = NO;
    BOOL hasIconsDir = [fm fileExistsAtPath:iconsDir isDirectory:&isDir] && isDir;
    NSArray *contents = hasIconsDir ? [fm contentsOfDirectoryAtPath:iconsDir error:NULL] : nil;
    BOOL hasCachedAssets = (contents.count > 0);

    NSString *bgPath = [skinRoot stringByAppendingPathComponent:@"background.png"];

    dispatch_group_t group = dispatch_group_create();
    __block BOOL zipOK = YES;

    #if __has_include(<SSZipArchive/SSZipArchive.h>)
        // 若本地尚未缓存该皮肤资源且提供了 zipName，则从 bundle 读取 zip 并解压。
        if (!hasCachedAssets && zipName.length > 0) {
            dispatch_group_enter(group);

            // 兼容旧协议：zipName 可能形如 "bundle://001.zip"
            NSString *fileName = zipName ?: @"";
            if ([fileName hasPrefix:@"bundle://"]) {
                fileName = [fileName substringFromIndex:@"bundle://".length];
            }

            // 支持带子路径，例如 Images/001.zip
            NSString *dir  = [fileName stringByDeletingLastPathComponent];
            NSString *last = fileName.lastPathComponent;

            NSString *ext  = last.pathExtension;
            NSString *base = last;
            if (ext.length == 0) {
                ext = @"zip";
            } else {
                base = [last stringByDeletingPathExtension];
            }

            NSString *path = nil;
            if (dir.length > 0) {
                path = [[NSBundle mainBundle] pathForResource:base ofType:ext inDirectory:dir];
            } else {
                path = [[NSBundle mainBundle] pathForResource:base ofType:ext];
            }

            NSData *data = (path.length > 0) ? [NSData dataWithContentsOfFile:path] : nil;

            if (data.length == 0) {
                zipOK = NO;
                dispatch_group_leave(group);
            } else {
                // 将 Zip 写入临时路径再解压
                [[NSFileManager defaultManager] createDirectoryAtPath:skinRoot
                                          withIntermediateDirectories:YES
                                                           attributes:nil
                                                                error:NULL];
                NSString *zipPath = [skinRoot stringByAppendingPathComponent:@"skin.zip"];
                if (![data writeToFile:zipPath atomically:YES]) {
                    zipOK = NO;
                    dispatch_group_leave(group);
                } else {
                    NSError *unzipError = nil;
                    BOOL ok = [SSZipArchive unzipFileAtPath:zipPath
                                               toDestination:skinRoot
                                                   overwrite:YES
                                                    password:nil
                                                       error:&unzipError];
                    [fm removeItemAtPath:zipPath error:nil];
                    if (!ok || unzipError) {
                        zipOK = NO;
                        dispatch_group_leave(group);
                    } else {
                        // 兼容“额外包一层目录”的压缩结构，与远程模式保持一致。
                        BOOL isDir2 = NO;
                        NSArray *iconsContent = [fm contentsOfDirectoryAtPath:iconsDir error:NULL];
                        BOOL iconsValid = ([fm fileExistsAtPath:iconsDir isDirectory:&isDir2] && isDir2 && iconsContent.count > 0);
                        if (!iconsValid) {
                            NSArray<NSString *> *subItems = [fm contentsOfDirectoryAtPath:skinRoot error:NULL];
                            for (NSString *name in subItems) {
                                if ([name isEqualToString:@"icons"] || [name isEqualToString:@"__MACOSX"]) continue;
                                NSString *nestedRoot = [skinRoot stringByAppendingPathComponent:name];
                                BOOL isDirNested = NO;
                                if (![fm fileExistsAtPath:nestedRoot isDirectory:&isDirNested] || !isDirNested) continue;

                                NSString *nestedIcons = [nestedRoot stringByAppendingPathComponent:@"icons"];
                                BOOL isDirNestedIcons = NO;
                                if ([fm fileExistsAtPath:nestedIcons isDirectory:&isDirNestedIcons] && isDirNestedIcons) {
                                    NSArray *nestedFiles = [fm contentsOfDirectoryAtPath:nestedIcons error:NULL];
                                    if (nestedFiles.count > 0) {
                                        [fm createDirectoryAtPath:iconsDir
                                       withIntermediateDirectories:YES
                                                        attributes:nil
                                                             error:NULL];
                                        for (NSString *fn in nestedFiles) {
                                            NSString *from = [nestedIcons stringByAppendingPathComponent:fn];
                                            NSString *to   = [iconsDir stringByAppendingPathComponent:fn];
                                            [fm removeItemAtPath:to error:nil];
                                            [fm moveItemAtPath:from toPath:to error:nil];
                                        }
                                    }
                                }

                                NSString *nestedBg = [nestedRoot stringByAppendingPathComponent:@"background.png"];
                                if ([fm fileExistsAtPath:nestedBg]) {
                                    [fm removeItemAtPath:bgPath error:nil];
                                    [fm moveItemAtPath:nestedBg toPath:bgPath error:nil];
                                }
                            }
                        }
                        dispatch_group_leave(group);
                    }
                }
            }
        }
    #else
        zipOK = NO;
    #endif

    dispatch_group_notify(group, dispatch_get_main_queue(), ^{
        // 构造 key_icons -> App Group 相对路径 映射
        NSMutableDictionary<NSString *, NSString *> *iconPathMap = [NSMutableDictionary dictionary];
        [iconShortNames enumerateKeysAndObjectsUsingBlock:^(NSString *identifier, NSString *shortName, BOOL *stop) {
            if (![shortName isKindOfClass:NSString.class] || shortName.length == 0) return;
            NSString *fileName = shortName;
            if (fileName.pathExtension.length == 0) {
                fileName = [fileName stringByAppendingPathExtension:@"png"];
            }
            NSString *relative = [NSString stringWithFormat:@"Skins/%@/icons/%@", skinId, fileName];
            iconPathMap[identifier] = relative;
        }];

        NSMutableDictionary *themeJSON = [skin mutableCopy];
        themeJSON[@"id"] = skinId;
        if (iconPathMap.count > 0) {
            themeJSON[@"key_icons"] = iconPathMap.copy;
        }

        BOOL themeOK = [[KBSkinManager shared] applyThemeFromJSON:themeJSON];

        NSData *bgData = [NSData dataWithContentsOfFile:bgPath];
        BOOL ok = themeOK;
        if (bgData.length > 0) {
            ok = [[KBSkinManager shared] applyImageSkinWithData:bgData skinId:skinId name:name];
        }

        if (!zipOK && !hasCachedAssets) {
            ok = NO;
        }

        if (completion) completion(ok);
        [KBHUD showInfo:(ok ? KBLocalized(@"已应用，切到键盘查看") : KBLocalized(@"应用皮肤失败"))];
    });
}

@end