"""編集系画面で再利用するEditorフレームワーク（最小版）。"""

from dataclasses import dataclass
from typing import Callable, List, Optional
import flet as ft
from models.invoice_models import InvoiceItem, Product


@dataclass
class ValidationResult:
    """編集内容の検証結果。"""

    ok: bool
    errors: List[str]


def normalize_invoice_items(items: List[InvoiceItem]) -> List[InvoiceItem]:
    """保存前に明細を正規化（空行除去・数値補正）。"""
    normalized: List[InvoiceItem] = []

    for item in items:
        description = (item.description or "").strip()
        quantity = int(item.quantity or 0)
        unit_price = int(item.unit_price or 0)

        if not description and quantity == 0 and unit_price == 0:
            continue

        if quantity <= 0:
            quantity = 1

        normalized.append(
            InvoiceItem(
                description=description,
                quantity=quantity,
                unit_price=unit_price,
                is_discount=bool(getattr(item, "is_discount", False)),
                product_id=getattr(item, "product_id", None),
            )
        )

    return normalized


def validate_invoice_items(items: List[InvoiceItem]) -> ValidationResult:
    """明細の最小バリデーション。"""
    errors: List[str] = []

    if not items:
        errors.append("明細を1行以上入力してください")
        return ValidationResult(ok=False, errors=errors)

    for idx, item in enumerate(items, start=1):
        if not (item.description or "").strip():
            errors.append(f"{idx}行目: 商品名を入力してください")
        if int(item.quantity or 0) <= 0:
            errors.append(f"{idx}行目: 数量は1以上で入力してください")
        if int(item.unit_price or 0) < 0:
            errors.append(f"{idx}行目: 単価は0以上で入力してください")

    return ValidationResult(ok=len(errors) == 0, errors=errors)


def build_invoice_items_view_table(items: List[InvoiceItem]) -> ft.Column:
    """読み取り専用の明細テーブル。"""
    header_row = ft.Row(
        [
            ft.Text("商品名", size=12, weight=ft.FontWeight.BOLD, expand=True),
            ft.Text("数", size=12, weight=ft.FontWeight.BOLD, width=35),
            ft.Text("単価", size=12, weight=ft.FontWeight.BOLD, width=70),
            ft.Text("小計", size=12, weight=ft.FontWeight.BOLD, width=70),
            ft.Container(width=35),
        ]
    )

    data_rows = []
    for item in items:
        data_rows.append(
            ft.Row(
                [
                    ft.Text(item.description, size=12, expand=True),
                    ft.Text(str(item.quantity), size=12, width=35, text_align=ft.TextAlign.RIGHT),
                    ft.Text(f"¥{item.unit_price:,}", size=12, width=70, text_align=ft.TextAlign.RIGHT),
                    ft.Text(
                        f"¥{item.subtotal:,}",
                        size=12,
                        weight=ft.FontWeight.BOLD,
                        width=70,
                        text_align=ft.TextAlign.RIGHT,
                    ),
                    ft.Container(width=35),
                ]
            )
        )

    list_control = ft.Column(data_rows, spacing=4)
    return ft.Column(
        [
            header_row,
            ft.Divider(height=1, color=ft.Colors.GREY_400),
            ft.Container(content=list_control, height=250, padding=0),
        ]
    )


def build_invoice_items_edit_table(
    items: List[InvoiceItem],
    is_locked: bool,
    on_update_field: Callable[[int, str, str], None],
    on_delete_row: Callable[[int], None],
    products: List[Product],
    on_product_select: Callable[[int], None] | None = None,
    row_refs: Optional[dict] = None,
) -> ft.Column:
    """編集モードの明細テーブル。"""
    header_row = ft.Row(
        [
            ft.Text("商品", size=12, weight=ft.FontWeight.BOLD, width=180),
            ft.Text("数", size=12, weight=ft.FontWeight.BOLD, width=35),
            ft.Text("単価", size=12, weight=ft.FontWeight.BOLD, width=70),
            ft.Text("小計", size=12, weight=ft.FontWeight.BOLD, width=70),
            ft.Container(width=35),
        ]
    )

    data_rows: List[ft.Control] = []
    for i, item in enumerate(items):
        product_label = item.description if item.description else "商品選択"
        product_field = ft.Button(
            content=ft.Text(product_label, no_wrap=True),
            width=180,
            height=36,
            on_click=(lambda _, idx=i: on_product_select(idx)) if on_product_select else None,
            disabled=is_locked,
            style=ft.ButtonStyle(
                padding=ft.Padding.symmetric(horizontal=10, vertical=6),
                bgcolor=ft.Colors.BLUE_GREY_100,
                shape=ft.RoundedRectangleBorder(radius=4),
            ),
        )

        quantity_field = ft.TextField(
            value=str(item.quantity),
            text_size=12,
            height=28,
            width=35,
            text_align=ft.TextAlign.RIGHT,
            border=ft.border.all(1, ft.Colors.BLUE_200),
            bgcolor=ft.Colors.WHITE,
            content_padding=ft.padding.all(5),
            on_change=lambda e, idx=i: on_update_field(idx, "quantity", e.control.value),
            keyboard_type=ft.KeyboardType.NUMBER,
        )

        unit_price_field = ft.TextField(
            value=f"{item.unit_price:,}",
            text_size=12,
            height=28,
            width=70,
            text_align=ft.TextAlign.RIGHT,
            border=ft.border.all(1, ft.Colors.BLUE_200),
            bgcolor=ft.Colors.WHITE,
            content_padding=ft.padding.all(5),
            on_change=lambda e, idx=i: on_update_field(idx, "unit_price", e.control.value.replace(",", "")),
            keyboard_type=ft.KeyboardType.NUMBER,
        )

        delete_button = ft.IconButton(
            ft.Icons.DELETE_OUTLINE,
            tooltip="行を削除",
            icon_color=ft.Colors.RED_600,
            disabled=is_locked,
            icon_size=16,
            on_click=lambda _, idx=i: on_delete_row(idx),
        )

        subtotal_text = ft.Text(
            f"¥{item.subtotal:,}",
            size=12,
            weight=ft.FontWeight.BOLD,
            width=70,
            text_align=ft.TextAlign.RIGHT,
        )

        if row_refs is not None:
            row_refs[i] = {
                "product": product_field,
                "quantity": quantity_field,
                "unit_price": unit_price_field,
                "subtotal": subtotal_text,
            }

        data_rows.append(
            ft.Row(
                [
                    product_field,
                    quantity_field,
                    unit_price_field,
                    subtotal_text,
                    delete_button,
                ],
                key=f"row-{i}-{item.description}",
            )
        )

    list_control: ft.Control = ft.Column(data_rows, spacing=4)

    return ft.Column(
        [
            header_row,
            ft.Divider(height=1, color=ft.Colors.GREY_400),
            ft.Container(
                content=list_control,
                height=250,
                padding=0,
                bgcolor=None,
                border_radius=0,
                expand=False,
            ),
        ]
    )