cdb_ui/lib/pages/flow.dart

import 'package:cdb_ui/api.dart' as API;
import 'package:cdb_ui/pages/expandable_list.dart';
import 'package:cdb_ui/pages/transaction.dart';
import 'package:flutter/material.dart';

class FlowsPage extends StatefulWidget {
  const FlowsPage({super.key});

  @override
  State<FlowsPage> createState() => _FlowsPageState();
}

class _FlowsPageState extends State<FlowsPage> {
  int tabSelection = 0;
  Map<String, API.FlowInfo>? flowInfos;

  @override
  void initState() {
    super.initState();
    API.API().getFlows().then(
      (value) {
        setState(() {
          flowInfos = value;
        });
      },
    );
  }

  Widget flowTile(BuildContext context, API.FlowInfo x) {
    return ListTile(
      title: Text(x.name),
      onTap: () {
        Navigator.of(context).push(MaterialPageRoute(
          builder: (context) => FlowInfoPage(x),
        ));
      },
    );
  }

  Widget listFlowInfoByActive(
      BuildContext context, Map<String, API.FlowInfo> infos) {
    return FutureBuilder(future: () async {
      var included = [];

      for (var key in infos.keys) {
        var active = await API.API().getActiveFlowsOf(key);
        if (active.isNotEmpty) {
          included.add(infos[key]);
        }
      }

      return included;
    }(), builder: (context, snapshot) {
      if (!snapshot.hasData) {
        return const CircularProgressIndicator();
      }

      var included = snapshot.data!;

      return ListView(
          children: included.map((x) => flowTile(context, x)).toList());
    });
  }

  Widget listAllFlowInfos(
      BuildContext context, Map<String, API.FlowInfo> infos) {
    return ListView(
        children: infos.values.map((x) {
      return flowTile(context, x);
    }).toList());
  }

  Widget listFlowInfoByProduced(
      BuildContext context, Map<String, API.FlowInfo> infos) {
    Map<String, List<API.FlowInfo>> producedMapping = {};

    for (var f in infos.values) {
      for (var produces in f.produces ?? []) {
        var item = API.itemVariant(produces).$1;
        producedMapping.putIfAbsent(item, () {
          return [];
        });
        producedMapping[item]!.add(f);
      }
    }

    List<ExpandableListItem> items = [];

    for (var key in producedMapping.keys) {
      var flows = Column(
          children: producedMapping[key]!.map((x) {
        return flowTile(context, x);
      }).toList());
      items.add(
          ExpandableListItem(body: flows, header: ListTile(title: Text(key))));
    }

    return ExpandableList(items);
  }

  Widget listFlowInfoByDependant(
      BuildContext context, Map<String, API.FlowInfo> infos) {
    Map<String, List<API.FlowInfo>> dependsMapping = {};

    for (var f in infos.values) {
      for (var produces in f.depends) {
        var item = API.itemVariant(produces).$1;
        // todo : add only if item is in inventory
        dependsMapping.putIfAbsent(item, () {
          return [];
        });
        dependsMapping[item]!.add(f);
      }
    }

    List<ExpandableListItem> items = [];

    for (var key in dependsMapping.keys) {
      var flows = Column(
          children: dependsMapping[key]!.map((x) {
        return flowTile(context, x);
      }).toList());
      items.add(
          ExpandableListItem(body: flows, header: ListTile(title: Text(key))));
    }

    return ExpandableList(items);
  }

  @override
  Widget build(BuildContext context) {
    if (flowInfos == null) {
      return const CircularProgressIndicator();
    }

    return DefaultTabController(
        length: 4,
        child: Scaffold(
            appBar: AppBar(
                title: const Text("Flows"),
                bottom: TabBar(
                  tabs: const [
                    Tab(text: "All"),
                    Tab(text: "Produces"),
                    Tab(text: "Depends"),
                    Tab(text: "Active")
                  ],
                  onTap: (value) {
                    setState(() {
                      tabSelection = value;
                    });
                  },
                )),
            body: switch (tabSelection) {
              0 => listAllFlowInfos(context, flowInfos!),
              1 => listFlowInfoByProduced(context, flowInfos!),
              2 => listFlowInfoByDependant(context, flowInfos!),
              3 => listFlowInfoByActive(context, flowInfos!),
              _ => const Text("..."),
            }));
  }
}

class FlowInfoPage extends StatefulWidget {
  final API.FlowInfo info;

  const FlowInfoPage(this.info, {super.key});

  @override
  State<FlowInfoPage> createState() => _FlowInfoPageState();
}

class _FlowInfoPageState extends State<FlowInfoPage> {
  void refresh() {
    setState(() {});
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text(widget.info.name)),
      body: Column(
        children: [
          // todo : ui improve
          if (widget.info.next != null) Text("Next: ${widget.info.next}"),
          if (widget.info.depends.isNotEmpty)
            Row(
              mainAxisAlignment: MainAxisAlignment.spaceEvenly,
              children: [
                const Text("Flow can use: "),
                ...widget.info.depends.map((x) => Text(x)).toList(),
              ],
            ),
          if (widget.info.produces?.isNotEmpty ?? false)
            Row(
              mainAxisAlignment: MainAxisAlignment.spaceEvenly,
              children: [
                const Text("Flow can produce: "),
                ...widget.info.produces!.map((x) => Text(x)).toList(),
              ],
            ),
          const Divider(),
          FutureBuilder(
            future: API.API().getActiveFlowsOf(widget.info.id),
            builder: (context, snapshot) {
              if (!snapshot.hasData) {
                return const CircularProgressIndicator();
              }

              var data = snapshot.data!;

              return ListView(
                  children: data
                      .map((x) => ListTile(
                          title: Text(x.id),
                          onTap: () =>
                              Navigator.of(context).push(MaterialPageRoute(
                                builder: (context) => ActiveFlowPage(x),
                              ))))
                      .toList());
            },
          )
        ],
      ),
      floatingActionButton: FloatingActionButton(
          onPressed: () {
            Navigator.of(context).push(MaterialPageRoute(
                builder: (context) => CreateFlowPage(widget.info, refresh)));
          },
          child: const Icon(Icons.add)),
    );
  }
}

class CreateFlowPage extends StatelessWidget {
  final API.FlowInfo info;
  final Function refresh;
  Map<String, List<API.Transaction>> depends = {};

  CreateFlowPage(this.info, this.refresh, {super.key});

  void _create(BuildContext context) {
    // todo : input handling
    API.API().startFlow(info.id, input: []).then((flowID) {
      refresh();
      API.API().getFlow(flowID).then((flow) {
        Navigator.of(context).pushReplacement(
            MaterialPageRoute(builder: (context) => ActiveFlowPage(flow)));
      });
    });
  }

  void selectDependItems(BuildContext context, String itemVariant) {
    var (item, variant) = API.itemVariant(itemVariant);

    API.API().getInventoryOfVariant(item, variant).then((transactions) {
      Navigator.of(context).push(MaterialPageRoute(
        builder: (context) {
          return TransactionSelectPage(transactions, onSelect: (t) {
            depends.putIfAbsent(itemVariant, () {
              return [];
            });
            depends[itemVariant]!.add(t);
          }, exclude: depends[itemVariant] ?? []);
        },
      ));
    });
  }

  @override
  Widget build(BuildContext context) {
    // todo : able to add transactions from depends
    return Scaffold(
      body: null,
    );
  }
}

class TransactionSelectPage extends StatelessWidget {
  final Function(API.Transaction) onSelect;
  final List<API.Transaction> selections;
  final List<API.Transaction>? exclude;

  const TransactionSelectPage(this.selections,
      {super.key, required this.onSelect, this.exclude});

  @override
  Widget build(BuildContext context) {
    var selectionList = [];

    for (var s in selections) {
      if (exclude?.any((x) => x.uuid == s.uuid) ?? false) {
        continue;
      }

      selectionList.add(s);
    }

    return Scaffold(
      appBar: AppBar(
        title: const Text("Select a Transaction"),
      ),
      body: ListView(
          children: selections
              .map((x) => TransactionCard(
                    x,
                    () {},
                    onLongPress: (x) {},
                    onTap: (t) {
                      onSelect(t);
                      Navigator.of(context).pop();
                    },
                  ))
              .toList()),
    );
  }
}

class ActiveFlowPage extends StatelessWidget {
  late API.Flow flow;

  ActiveFlowPage(this.flow);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        body: Column(
      children: [],
    ));
  }
}