/*
 * Copyright [2019] [Doric.Pub]
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
//
// Created by pengfei.zhou on 2019/11/15.
//

#import <JavaScriptCore/JavaScriptCore.h>
#import "DoricListNode.h"
#import "DoricExtensions.h"
#import "DoricListItemNode.h"

@interface DoricListNode () <UITableViewDataSource, UITableViewDelegate>
@property(nonatomic, strong) NSMutableDictionary <NSNumber *, DoricListItemNode *> *tempNodes;
@property(nonatomic, assign) NSUInteger itemCount;
@property(nonatomic, assign) NSUInteger batchCount;
@end

@implementation DoricListNode
- (instancetype)initWithContext:(DoricContext *)doricContext {
    if (self = [super initWithContext:doricContext]) {
        _tempNodes = [NSMutableDictionary new];
        _batchCount = 15;
    }
    return self;
}

- (UITableView *)build {
    return [[UITableView new] also:^(UITableView *it) {
        it.dataSource = self;
        it.delegate = self;
    }];
}

- (void)blendView:(UITableView *)view forPropName:(NSString *)name propValue:(id)prop {
    if ([@"itemCount" isEqualToString:name]) {
        self.itemCount = [prop unsignedIntegerValue];
    } else if ([@"renderItem" isEqualToString:name]) {
        [self.tempNodes removeAllObjects];
        [self clearSubModel];
    } else if ([@"batchCount" isEqualToString:name]) {
        self.batchCount = [prop unsignedIntegerValue];
    } else {
        [super blendView:view forPropName:name propValue:prop];
    }
}

- (void)blend:(NSDictionary *)props {
    [super blend:props];
    [self.view reloadData];
}

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

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    NSUInteger position = (NSUInteger) indexPath.row;
    NSDictionary *model = [self itemModelAt:position];
    NSDictionary *props = model[@"props"];
    NSString *reuseId = props[@"identifier"];

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:reuseId];
    if (!cell) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:reuseId];
    }
    DoricListItemNode *node = self.tempNodes[@(position)];
    node.view = cell;
    [node blend:props];
    return cell;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
    NSUInteger position = (NSUInteger) indexPath.row;
    NSDictionary *model = [self itemModelAt:position];

    return 60;
}

- (NSDictionary *)itemModelAt:(NSUInteger)position {
    NSString *viewId = self.tempNodes[@(position)].viewId;
    if (viewId && viewId.length > 0) {
        return [self subModelOf:viewId];
    } else {
        DoricAsyncResult *result = [self callJSResponse:@"renderBunchedItems", @(position), @(self.batchCount), nil];
        JSValue *models = [result waitUntilResult];
        NSArray *array = [models toArray];
        [array enumerateObjectsUsingBlock:^(NSDictionary *obj, NSUInteger idx, BOOL *stop) {
            NSString *thisViewId = obj[@"id"];
            [self setSubModel:obj in:thisViewId];
            NSUInteger pos = position + idx;
            DoricListItemNode *node = [[DoricListItemNode alloc] initWithContext:self.doricContext];
            node.viewId = thisViewId;
            [node initWithSuperNode:self];
            self.tempNodes[@(pos)] = node;
        }];
        return array[0];
    }
}

@end