//
//  KBChatPanelView.m
//  CustomKeyboard
//

#import "KBChatPanelView.h"
#import "KBChatMessage.h"
#import "KBChatMessageCell.h"
#import "Masonry.h"

@interface KBChatPanelView () <UITableViewDataSource, UITableViewDelegate>
@property (nonatomic, strong) UITableView *tableViewInternal;
@property (nonatomic, copy) NSArray<KBChatMessage *> *messages;
@end

@implementation KBChatPanelView

- (instancetype)initWithFrame:(CGRect)frame {
    if (self = [super initWithFrame:frame]) {
        self.backgroundColor = [UIColor colorWithHex:0xD1D3DB];

        [self addSubview:self.tableViewInternal];

        [self.tableViewInternal mas_makeConstraints:^(MASConstraintMaker *make) {
            make.left.right.equalTo(self);
            make.top.equalTo(self.mas_top).offset(8);
            make.bottom.equalTo(self.mas_bottom).offset(-8);
        }];
    }
    return self;
}

#pragma mark - Public

- (void)kb_reloadWithMessages:(NSArray<KBChatMessage *> *)messages {
    self.messages = messages ?: @[];
    [self.tableViewInternal reloadData];
    if (self.messages.count > 0) {
        NSIndexPath *indexPath = [NSIndexPath indexPathForRow:self.messages.count - 1 inSection:0];
        [self.tableViewInternal scrollToRowAtIndexPath:indexPath
                                      atScrollPosition:UITableViewScrollPositionBottom
                                              animated:YES];
    }
}

#pragma mark - UITableViewDataSource

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return self.messages.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    KBChatMessageCell *cell = [tableView dequeueReusableCellWithIdentifier:NSStringFromClass(KBChatMessageCell.class)];
    KBChatMessage *msg = self.messages[indexPath.row];
    [cell kb_configureWithMessage:msg];
    return cell;
}

#pragma mark - UITableViewDelegate

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
    return UITableViewAutomaticDimension;
}

- (CGFloat)tableView:(UITableView *)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath *)indexPath {
    return 44.0;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    if (indexPath.row >= self.messages.count) { return; }
    KBChatMessage *msg = self.messages[indexPath.row];
    if ([self.delegate respondsToSelector:@selector(chatPanelView:didTapMessage:)]) {
        [self.delegate chatPanelView:self didTapMessage:msg];
    }
}

#pragma mark - Lazy

- (UITableView *)tableViewInternal {
    if (!_tableViewInternal) {
        _tableViewInternal = [[UITableView alloc] initWithFrame:CGRectZero style:UITableViewStylePlain];
        _tableViewInternal.backgroundColor = [UIColor clearColor];
        _tableViewInternal.separatorStyle = UITableViewCellSeparatorStyleNone;
        _tableViewInternal.dataSource = self;
        _tableViewInternal.delegate = self;
        _tableViewInternal.estimatedRowHeight = 44.0;
        _tableViewInternal.rowHeight = UITableViewAutomaticDimension;
        [_tableViewInternal registerClass:KBChatMessageCell.class forCellReuseIdentifier:NSStringFromClass(KBChatMessageCell.class)];
    }
    return _tableViewInternal;
}

#pragma mark - Expose

- (UITableView *)tableView { return self.tableViewInternal; }

@end