from datetime import datetime

from textual import on
from textual.app import App, ComposeResult
from textual.binding import Binding
from textual.containers import Grid
from textual.events import DescendantBlur
from textual.widgets import Header, Footer, DataTable, Input, Button, Label, Checkbox
from textual.containers import Horizontal, Vertical
from textual.coordinate import Coordinate
from textual.screen import Screen, ModalScreen

from textual_autocomplete import AutoComplete, Dropdown, DropdownItem

from peewee import fn, JOIN

from .db import (
    db,
    HamsterCategory,
    HamsterActivity,
    HamsterFact,
    KimaiProject,
    KimaiCustomer,
    KimaiActivity,
    HamsterActivityKimaiMapping,
)
from .kimai import (
    KimaiAPI,
    Customer as KimaiAPICustomer,
    Project as KimaiAPIProject,
    Activity as KimaiAPIActivity,
)


class ListScreen(Screen):
    def compose(self) -> ComposeResult:
        yield Header()
        with Vertical():
            yield DataTable()
            with Horizontal(id="filter"):
                yield Input(
                    id="search", placeholder="Category/activity name contains text"
                )
                yield Input(
                    id="date",
                    placeholder="After date, in {0} format".format(
                        datetime.now().strftime("%Y-%m-%d")
                    ),
                )
        yield Footer()

    def action_refresh(self) -> None:
        self._refresh()

    def action_sort(self) -> None:
        self.table.cursor_type = "column"

    def on_data_table_column_selected(self, event):
        self.sort = (event.column_key,)
        event.data_table.sort(*self.sort)
        event.data_table.cursor_type = "row"

    def action_filter(self) -> None:
        self.query_one("#filter").display = True
        self._refresh()
        self.query_one("#filter #search").focus()

    def on_input_submitted(self, event):
        self.table.focus()

    def action_cancelfilter(self) -> None:
        self.query_one("#filter").display = False
        self.query_one("#filter #search").clear()
        self.query_one("#filter #date").clear()
        self.table.focus()
        self._refresh()

    @on(Input.Changed, "#filter Input")
    def filter(self, event):
        self._refresh()


class ActivityEditScreen(ModalScreen):
    BINDINGS = [
        ("escape", "cancel", "Cancel"),
        ("ctrl+s", "save", "Save"),
    ]

    category_id = None
    category_name = ""

    def _get_categories(self, input_state):
        categories = [DropdownItem(c.name, str(c.id)) for c in HamsterCategory.select()]
        return ActivityMappingScreen._filter_dropdowns(categories, input_state.value)

    def __init__(self, category, activity):
        if category is not None:
            self.category_id = category.id
            self.category_name = category.name
        self.activity_name = activity.name
        super().__init__()

    def compose(self) -> ComposeResult:
        yield Vertical(
            Horizontal(
                Label("Category:"),
                AutoComplete(
                    Input(
                        placeholder="Type to search...",
                        id="category",
                        value=self.category_name,
                    ),
                    Dropdown(items=self._get_categories),
                ),
            ),
            Horizontal(
                Label("Activity:"), Input(value=self.activity_name, id="activity")
            ),
        )

    @on(Input.Submitted, "#category")
    def category_submitted(self, event):
        if event.control.parent.dropdown.selected_item is not None:
            self.category_id = str(
                event.control.parent.dropdown.selected_item.left_meta
            )
            self.query_one("#activity").focus()

    @on(DescendantBlur, "#category")
    def category_blur(self, event):
        if event.control.parent.dropdown.selected_item is not None:
            self.category_id = str(
                event.control.parent.dropdown.selected_item.left_meta
            )

    def action_cancel(self):
        self.dismiss(None)

    def action_save(self):
        self.dismiss(
            {
                "category": self.category_id,
                "activity": self.query_one("#activity").value,
            }
        )


class ActivityMappingScreen(ModalScreen):
    BINDINGS = [
        ("ctrl+g", "global", "Toggle global"),
        ("ctrl+s", "save", "Save"),
        ("escape", "cancel", "Cancel"),
    ]

    customer_id = None
    project_id = None
    activity_id = None

    def __init__(self, category, activity):
        self.category = category
        self.activity = activity
        super().__init__()

    @staticmethod
    def _filter_dropdowns(options, value):
        matches = [c for c in options if value.lower() in c.main.plain.lower()]
        return sorted(matches, key=lambda v: v.main.plain.startswith(value.lower()))

    def _get_customers(self, input_state):
        customers = [DropdownItem(c.name, str(c.id)) for c in KimaiCustomer.select()]
        return ActivityMappingScreen._filter_dropdowns(customers, input_state.value)

    def _get_projects(self, input_state):
        projects = [
            DropdownItem(p.name, str(p.id))
            for p in KimaiProject.select().where(
                KimaiProject.customer_id == self.customer_id
            )
        ]
        return ActivityMappingScreen._filter_dropdowns(projects, input_state.value)

    def _get_activities(self, input_state):
        activities = KimaiActivity.select()

        if self.query_one("#global").value:
            activities = activities.where(
                KimaiActivity.project_id.is_null(),
            )
        else:
            activities = activities.where(KimaiActivity.project_id == self.project_id)

        return ActivityMappingScreen._filter_dropdowns(
            [DropdownItem(a.name, str(a.id)) for a in activities], input_state.value
        )

    def compose(self) -> ComposeResult:
        yield Vertical(
            Horizontal(
                Label(f"Mapping for {self.activity}@{self.category}"),
            ),
            Horizontal(
                Label("Customer"),
                AutoComplete(
                    Input(placeholder="Type to search...", id="customer"),
                    Dropdown(items=self._get_customers),
                ),
            ),
            Horizontal(
                Label("Project"),
                AutoComplete(
                    Input(placeholder="Type to search...", id="project"),
                    Dropdown(items=self._get_projects),
                ),
            ),
            Horizontal(
                Label("Activity"),
                AutoComplete(
                    Input(placeholder="Type to search...", id="activity"),
                    Dropdown(items=self._get_activities),
                ),
            ),
            Horizontal(
                Label("Description"),
                Input(id="description"),
            ),
            Horizontal(
                Label("Tags"),
                Input(id="tags"),
            ),
            Horizontal(Checkbox("Global", id="global")),
        )

    @on(Input.Submitted, "#customer")
    def customer_submitted(self, event):
        if event.control.parent.dropdown.selected_item is not None:
            self.customer_id = str(
                event.control.parent.dropdown.selected_item.left_meta
            )
            self.query_one("#project").focus()

    @on(DescendantBlur, "#customer")
    def customer_blur(self, event):
        if event.control.parent.dropdown.selected_item is not None:
            self.customer_id = str(
                event.control.parent.dropdown.selected_item.left_meta
            )

    @on(Input.Submitted, "#project")
    def project_submitted(self, event):
        if event.control.parent.dropdown.selected_item is not None:
            self.project_id = str(event.control.parent.dropdown.selected_item.left_meta)
            self.query_one("#activity").focus()

    @on(DescendantBlur, "#project")
    def project_blur(self, event):
        if event.control.parent.dropdown.selected_item is not None:
            self.project_id = str(event.control.parent.dropdown.selected_item.left_meta)

    @on(Input.Submitted, "#activity")
    def activity_submitted(self, event):
        if event.control.parent.dropdown.selected_item is not None:
            self.activity_id = str(
                event.control.parent.dropdown.selected_item.left_meta
            )
            self.query_one("#activity").focus()

    @on(DescendantBlur, "#activity")
    def activity_blur(self, event):
        if event.control.parent.dropdown.selected_item is not None:
            self.activity_id = str(
                event.control.parent.dropdown.selected_item.left_meta
            )

    def action_global(self):
        self.query_one("#global").value = not self.query_one("#global").value

    def action_save(self):
        self.dismiss(
            {
                "kimai_customer_id": self.customer_id,
                "kimai_project_id": self.project_id,
                "kimai_activity_id": self.activity_id,
                "kimai_description": self.query_one("#description").value,
                "kimai_tags": self.query_one("#tags").value,
                "global": self.query_one("#global").value,
            }
        )

    def action_cancel(self):
        self.dismiss(None)


class ActivityListScreen(ListScreen):
    BINDINGS = [
        ("s", "sort", "Sort"),
        ("r", "refresh", "Refresh"),
        ("/", "filter", "Search"),
        ("d", "delete", "Delete"),
        ("f", "move_facts", "Move facts"),
        ("e", "edit", "Edit"),
        ("m", "mapping", "Mapping"),
        Binding(key="escape", action="cancelfilter", show=False),
    ]

    def _refresh(self):
        self.table.clear()

        facts_count_query = (
            HamsterFact.select(
                HamsterFact.activity_id, fn.COUNT(HamsterFact.id).alias("facts_count")
            )
            .group_by(HamsterFact.activity_id)
            .alias("facts_count_query")
        )

        mappings_count_query = (
            HamsterActivityKimaiMapping.select(
                HamsterActivityKimaiMapping.hamster_activity_id,
                fn.COUNT(HamsterActivityKimaiMapping.id).alias("mappings_count"),
            )
            .group_by(HamsterActivityKimaiMapping.hamster_activity_id)
            .alias("mappings_count_query")
        )

        activities = (
            HamsterActivity.select(
                HamsterActivity,
                HamsterCategory.id,
                HamsterFact.start_time,
                fn.COALESCE(HamsterCategory.name, "None").alias("category_name"),
                fn.COALESCE(facts_count_query.c.facts_count, 0).alias("facts_count"),
                fn.COALESCE(mappings_count_query.c.mappings_count, 0).alias(
                    "mappings_count"
                ),
            )
            .join(HamsterCategory, JOIN.LEFT_OUTER)
            .switch(HamsterActivity)
            .join(HamsterFact, JOIN.LEFT_OUTER)
            .switch(HamsterActivity)
            .join(
                facts_count_query,
                JOIN.LEFT_OUTER,
                on=(HamsterActivity.id == facts_count_query.c.activity_id),
            )
            .switch(HamsterActivity)
            .join(
                mappings_count_query,
                JOIN.LEFT_OUTER,
                on=(HamsterActivity.id == mappings_count_query.c.hamster_activity_id),
            )
            .group_by(HamsterActivity)
        )

        filter_search = self.query_one("#filter #search").value
        if filter_search is not None:
            activities = activities.where(
                HamsterActivity.name.contains(filter_search)
                | HamsterCategory.name.contains(filter_search)
            )

        filter_date = self.query_one("#filter #date").value
        if filter_date is not None:
            try:
                activities = activities.where(
                    HamsterFact.start_time > datetime.strptime(filter_date, "%Y-%m-%d")
                )
            except ValueError:
                pass

        self.table.add_rows(
            [
                [
                    activity.category_id,
                    activity.category_name,
                    activity.id,
                    activity.name,
                    activity.facts_count,
                    activity.mappings_count,
                ]
                for activity in activities
            ]
        )

        self.table.sort(*self.sort)

    def on_mount(self) -> None:
        self.table = self.query_one(DataTable)
        self.table.cursor_type = "row"
        self.columns = self.table.add_columns(
            "category id", "category", "activity id", "activity", "entries", "mappings"
        )
        self.sort = (self.columns[1], self.columns[3])
        self._refresh()

    def action_delete(self) -> None:
        # get the keys for the row and column under the cursor.
        row_key, _ = self.table.coordinate_to_cell_key(self.table.cursor_coordinate)

        activity_id = self.table.get_cell_at(
            Coordinate(self.table.cursor_coordinate.row, 2),
        )

        activity = HamsterActivity.get(id=activity_id)
        activity.delete_instance()

        # supply the row key to `remove_row` to delete the row.
        self.table.remove_row(row_key)

    def action_move_facts(self) -> None:
        row_idx: int = self.table.cursor_row
        row_cells = self.table.get_row_at(row_idx)
        self.move_from_activity = HamsterActivity.get(id=row_cells[2])
        for col_idx, cell_value in enumerate(row_cells):
            cell_coordinate = Coordinate(row_idx, col_idx)
            self.table.update_cell_at(
                cell_coordinate,
                f"[red]{cell_value}[/red]",
            )
        self.table.move_cursor(row=self.table.cursor_coordinate[0] + 1)

    def on_data_table_row_selected(self, event):
        if getattr(self, "move_from_activity", None) is not None:
            move_to_activity = HamsterActivity.get(
                self.table.get_cell_at(Coordinate(event.cursor_row, 2))
            )
            HamsterFact.update({HamsterFact.activity: move_to_activity}).where(
                HamsterFact.activity == self.move_from_activity
            ).execute()
            self._refresh()
            del self.move_from_activity

    def action_edit(self):
        row_idx: int = self.table.cursor_row
        row_cells = self.table.get_row_at(row_idx)

        try:
            category = HamsterCategory.get(id=row_cells[0])
        except HamsterCategory.DoesNotExist:
            category = None
        activity = HamsterActivity.get(id=row_cells[2])

        def handle_edit(properties):
            if properties is None:
                return
            activity.name = properties["activity"]
            activity.category_id = properties["category"]
            activity.save()
            self._refresh()

        self.app.push_screen(
            ActivityEditScreen(category=category, activity=activity), handle_edit
        )

    def action_mapping(self):
        selected_activity = (
            HamsterActivity.select(
                HamsterActivity,
                fn.COALESCE(HamsterCategory.name, "None").alias("category_name"),
            )
            .join(HamsterCategory, JOIN.LEFT_OUTER)
            .where(
                HamsterActivity.id
                == self.table.get_cell_at(
                    Coordinate(self.table.cursor_coordinate.row, 2),
                )
            )
            .get()
        )

        def handle_mapping(mapping):
            if mapping is None:
                return
            m = HamsterActivityKimaiMapping.create(
                hamster_activity=selected_activity, **mapping
            )
            m.save()
            filter_search = self.query_one("#search")
            self._refresh()

        self.app.push_screen(
            ActivityMappingScreen(
                category=selected_activity.category_name,
                activity=selected_activity.name,
            ),
            handle_mapping,
        )


class CategoryListScreen(ListScreen):
    BINDINGS = [
        ("s", "sort", "Sort"),
        ("r", "refresh", "Refresh"),
        ("/", "filter", "Search"),
        ("d", "delete", "Delete category"),
        Binding(key="escape", action="cancelfilter", show=False),
    ]

    def _refresh(self):
        self.table.clear()

        categories = (
            HamsterCategory.select(
                HamsterCategory,
                fn.Count(HamsterActivity.id).alias("activities_count"),
                HamsterFact.start_time,
            )
            .join(HamsterActivity, JOIN.LEFT_OUTER)
            .join(HamsterFact, JOIN.LEFT_OUTER)
            .group_by(HamsterCategory)
        )

        filter_search = self.query_one("#filter #search").value
        if filter_search is not None:
            categories = categories.where(HamsterCategory.name.contains(filter_search))

        filter_date = self.query_one("#filter #date").value
        if filter_date is not None:
            try:
                categories = categories.where(
                    HamsterFact.start_time > datetime.strptime(filter_date, "%Y-%m-%d")
                )
            except ValueError:
                pass

        self.table.add_rows(
            [
                [
                    category.id,
                    category.name,
                    category.activities_count,
                ]
                for category in categories
            ]
        )

        self.table.sort(self.sort)

    def on_mount(self) -> None:
        self.table = self.query_one(DataTable)
        self.table.cursor_type = "row"
        self.columns = self.table.add_columns("category id", "category", "activities")
        self.sort = self.columns[1]
        self._refresh()

    def action_delete(self) -> None:
        row_key, _ = self.table.coordinate_to_cell_key(self.table.cursor_coordinate)

        category_id = self.table.get_cell_at(
            Coordinate(self.table.cursor_coordinate.row, 0),
        )
        category = HamsterCategory.get(id=category_id)
        category.delete_instance()

        self.table.remove_row(row_key)


class KimaiProjectListScreen(ListScreen):
    BINDINGS = [
        ("s", "sort", "Sort"),
        ("r", "refresh", "Refresh"),
        ("g", "get", "Get data"),
        ("/", "filter", "Search"),
        Binding(key="escape", action="cancelfilter", show=False),
    ]

    def _refresh(self, filter_query=None):
        self.table.clear()

        projects = (
            KimaiProject.select(
                KimaiProject,
                KimaiCustomer,
                fn.Count(KimaiActivity.id).alias("activities_count"),
            )
            .join(KimaiCustomer, JOIN.LEFT_OUTER)
            .switch(KimaiProject)
            .join(KimaiActivity, JOIN.LEFT_OUTER)
            .where(KimaiActivity.project.is_null(False))
            .group_by(KimaiProject)
        )

        if filter_query:
            projects = projects.where(
                KimaiProject.name.contains(filter_query)
                | KimaiCustomer.name.contains(filter_query)
            )

        self.table.add_rows(
            [
                [
                    project.customer.id,
                    project.customer.name,
                    project.id,
                    project.name,
                    project.activities_count,
                ]
                for project in projects
            ]
        )

        self.table.sort(self.sort)

    def action_get(self) -> None:
        api = KimaiAPI()

        KimaiCustomer.delete().execute()
        KimaiProject.delete().execute()
        KimaiActivity.delete().execute()

        customers = KimaiAPICustomer.list(api)
        with db.atomic():
            KimaiCustomer.insert_many(
                [{"id": customer.id, "name": customer.name} for customer in customers]
            ).execute()

        projects = KimaiAPIProject.list(api)
        with db.atomic():
            KimaiProject.insert_many(
                [
                    {
                        "id": project.id,
                        "name": project.name,
                        "customer_id": project.customer.id,
                        "allow_global_activities": project.allow_global_activities,
                    }
                    for project in projects
                ]
            ).execute()

        activities = KimaiAPIActivity.list(api)
        with db.atomic():
            KimaiActivity.insert_many(
                [
                    {
                        "id": activity.id,
                        "name": activity.name,
                        "project_id": (
                            activity.project and activity.project.id or None
                        ),
                    }
                    for activity in activities
                ]
            ).execute()

        self._refresh()

    def on_mount(self) -> None:
        self.table = self.query_one(DataTable)
        self.table.cursor_type = "row"
        self.columns = self.table.add_columns(
            "customer id", "customer", "project id", "project", "activities"
        )
        # self.sort = (self.columns[1], self.columns[3])
        self.sort = self.columns[1]
        self._refresh()


class HamsterToolsApp(App):
    CSS_PATH = "app.tcss"
    BINDINGS = [
        ("a", "switch_mode('activities')", "Activities"),
        ("c", "switch_mode('categories')", "Categories"),
        ("k", "switch_mode('kimai')", "Kimai"),
        ("q", "quit", "Quit"),
    ]

    def __init__(self):
        db.init("hamster-testing.db")

        self.MODES = {
            "categories": CategoryListScreen(),
            "activities": ActivityListScreen(),
            "kimai": KimaiProjectListScreen(),
        }

        super().__init__()

    def on_mount(self) -> None:
        self.switch_mode("activities")

    def action_quit(self) -> None:
        db.close()
        self.exit()