"""Completion Wizard for adding new items to a BOM sheet.

Three-step guided workflow:
1. Category selection (from schema)
2. Required fields (Description, optional PN)
3. Common fields (Source, Unit Cost, QTY, Sourcing Link, category-specific properties)

If a manually entered PN already exists, the PN Conflict Resolution dialog
is shown.
"""

from typing import Any, Dict, List, Optional, Tuple

from . import ai_client as _ai
from . import dialogs, sync_engine
from . import settings as _settings
from . import sheet_format as sf
from .client import SiloClient

# UNO imports
try:
    import uno

    _HAS_UNO = True

    _HAS_UNO = True
except ImportError:
    _HAS_UNO = False

# Category prefix descriptions for grouping in the picker
_PREFIX_GROUPS = {
    "F": "Fasteners",
    "C": "Fittings",
    "R": "Motion",
    "S": "Structural",
    "E": "Electrical",
    "M": "Mechanical",
    "T": "Tooling",
    "A": "Assemblies",
    "P": "Purchased",
    "X": "Custom Fabricated",
}

# Default sourcing type by category prefix
_DEFAULT_SOURCING = {
    "A": "M",  # assemblies are manufactured
    "X": "M",  # custom fab is manufactured
    "T": "M",  # tooling is manufactured
}


def _get_categories(
    client: SiloClient, schema: str = "kindred-rd"
) -> List[Tuple[str, str]]:
    """Fetch category codes and descriptions from the schema.

    Returns list of (code, description) tuples sorted by code.
    """
    try:
        schema_data = client.get_schema(schema)
        segments = schema_data.get("segments", [])
        cat_segment = None
        for seg in segments:
            if seg.get("name") == "category":
                cat_segment = seg
                break
        if cat_segment and cat_segment.get("values"):
            return sorted(cat_segment["values"].items())
    except RuntimeError:
        pass
    return []


def _get_category_properties(
    client: SiloClient, category: str, schema: str = "kindred-rd"
) -> List[str]:
    """Fetch property field names relevant to a category.

    Returns the list of property keys that apply to the category's prefix group.
    """
    try:
        prop_schema = client.get_property_schema(schema)
        # prop_schema has global defaults and category-specific overrides
        defaults = prop_schema.get("defaults", {})
        category_props = prop_schema.get("categories", {}).get(category[:1], {})
        # Merge: category-specific fields + global defaults
        all_keys = set(defaults.keys())
        all_keys.update(category_props.keys())
        return sorted(all_keys)
    except RuntimeError:
        return list(sf.PROPERTY_KEY_MAP.values())


# ---------------------------------------------------------------------------
# Wizard dialog (UNO)
# ---------------------------------------------------------------------------


def run_completion_wizard(
    client: SiloClient,
    doc,
    sheet,
    insert_row: int,
    project_code: str = "",
    schema: str = "kindred-rd",
) -> bool:
    """Run the item completion wizard. Returns True if a row was inserted.

    Parameters
    ----------
    client : SiloClient
    doc : XSpreadsheetDocument
    sheet : XSpreadsheet
    insert_row : int  (0-based row index to insert at)
    project_code : str  (for auto-tagging)
    schema : str
    """
    if not _HAS_UNO:
        return False

    ctx = uno.getComponentContext()
    smgr = ctx.ServiceManager

    # -- Step 1: Category selection -----------------------------------------
    categories = _get_categories(client, schema)
    if not categories:
        dialogs._msgbox(
            None,
            "Add Item",
            "Could not fetch categories from server.",
            box_type="errorbox",
        )
        return False

    # Build display list grouped by prefix
    cat_display = []
    for code, desc in categories:
        prefix = code[0] if code else "?"
        group = _PREFIX_GROUPS.get(prefix, "Other")
        cat_display.append(f"{code} - {desc}  [{group}]")

    # Use a simple input box with the category list as hint
    # (A proper ListBox dialog would be more polished but this is functional)
    cat_hint = ", ".join(c[0] for c in categories[:20])
    if len(categories) > 20:
        cat_hint += f"... ({len(categories)} total)"

    category_input = dialogs._input_box(
        "Add Item - Step 1/3",
        f"Category code ({cat_hint}):",
    )
    if not category_input:
        return False
    category = category_input.strip().upper()

    # Validate category
    valid_codes = {c[0] for c in categories}
    if category not in valid_codes:
        dialogs._msgbox(
            None,
            "Add Item",
            f"Unknown category: {category}",
            box_type="errorbox",
        )
        return False

    # -- Step 2: Required fields --------------------------------------------
    description = dialogs._input_box(
        "Add Item - Step 2/3",
        "Description (required, leave blank to use AI):",
    )

    # If blank and AI is configured, offer AI generation from seller description
    if (not description or not description.strip()) and _ai.is_configured():
        seller_desc = dialogs._input_box(
            "Add Item - AI Description",
            "Paste the seller description for AI generation:",
        )
        if seller_desc and seller_desc.strip():
            try:
                ai_desc = _ai.generate_description(
                    seller_description=seller_desc.strip(),
                    category=category,
                )
                accepted = dialogs.show_ai_description_dialog(
                    seller_desc.strip(), ai_desc
                )
                if accepted:
                    description = accepted
            except RuntimeError as e:
                dialogs._msgbox(
                    None,
                    "AI Description Failed",
                    str(e),
                    box_type="errorbox",
                )

    if not description or not description.strip():
        dialogs._msgbox(
            None, "Add Item", "Description is required.", box_type="errorbox"
        )
        return False

    manual_pn = dialogs._input_box(
        "Add Item - Step 2/3",
        "Part number (leave blank for auto-generation):",
    )

    # Check for PN conflict if user entered one
    use_existing_item = None
    if manual_pn and manual_pn.strip():
        manual_pn = manual_pn.strip()
        try:
            existing = client.get_item(manual_pn)
            # PN exists -- show conflict dialog
            result = dialogs.show_pn_conflict_dialog(manual_pn, existing)
            if result == dialogs.PN_USE_EXISTING:
                use_existing_item = existing
            elif result == dialogs.PN_CREATE_NEW:
                manual_pn = ""  # will auto-generate
            else:
                return False  # cancelled
        except RuntimeError:
            pass  # PN doesn't exist, which is fine

    # -- Step 3: Common fields ----------------------------------------------
    prefix = category[0] if category else ""
    default_source = _DEFAULT_SOURCING.get(prefix, "P")

    source = dialogs._input_box(
        "Add Item - Step 3/3",
        f"Sourcing type (M=manufactured, P=purchased) [default: {default_source}]:",
        default=default_source,
    )
    if source is None:
        return False
    source = source.strip().upper() or default_source

    unit_cost_str = dialogs._input_box(
        "Add Item - Step 3/3",
        "Unit cost (e.g. 10.50):",
        default="0",
    )
    unit_cost = 0.0
    if unit_cost_str:
        try:
            unit_cost = float(unit_cost_str.strip().replace("$", "").replace(",", ""))
        except ValueError:
            pass

    qty_str = dialogs._input_box(
        "Add Item - Step 3/3",
        "Quantity [default: 1]:",
        default="1",
    )
    qty = 1.0
    if qty_str:
        try:
            qty = float(qty_str.strip())
        except ValueError:
            pass

    sourcing_link = (
        dialogs._input_box(
            "Add Item - Step 3/3",
            "Sourcing link (URL, optional):",
        )
        or ""
    )

    # -- Create item or use existing ----------------------------------------
    created_item = None
    if use_existing_item:
        # Use the existing item's data
        created_item = use_existing_item
        final_pn = use_existing_item.get("part_number", manual_pn)
    elif manual_pn:
        # Create with the user's manual PN
        try:
            created_item = client.create_item(
                schema=schema,
                category=category,
                description=description.strip(),
                projects=[project_code] if project_code else None,
                sourcing_type=source,
                sourcing_link=sourcing_link.strip(),
                standard_cost=unit_cost if unit_cost else None,
            )
            final_pn = created_item.get("part_number", manual_pn)
        except RuntimeError as e:
            dialogs._msgbox(None, "Add Item Failed", str(e), box_type="errorbox")
            return False
    else:
        # Auto-generate PN
        try:
            created_item = client.create_item(
                schema=schema,
                category=category,
                description=description.strip(),
                projects=[project_code] if project_code else None,
                sourcing_type=source,
                sourcing_link=sourcing_link.strip(),
                standard_cost=unit_cost if unit_cost else None,
            )
            final_pn = created_item.get("part_number", "")
        except RuntimeError as e:
            dialogs._msgbox(None, "Add Item Failed", str(e), box_type="errorbox")
            return False

    if not final_pn:
        dialogs._msgbox(
            None, "Add Item", "No part number returned.", box_type="errorbox"
        )
        return False

    # Auto-tag with project if needed
    if project_code and created_item and not use_existing_item:
        try:
            client.add_item_projects(final_pn, [project_code])
        except RuntimeError:
            pass

    # -- Insert row into sheet ----------------------------------------------
    _insert_bom_row(
        sheet,
        insert_row,
        pn=final_pn,
        description=created_item.get("description", description.strip())
        if created_item
        else description.strip(),
        unit_cost=unit_cost,
        qty=qty,
        sourcing_link=sourcing_link.strip(),
        schema=schema,
        status=sync_engine.STATUS_NEW,
        parent_pn="",
    )

    return True


def _insert_bom_row(
    sheet,
    row: int,
    pn: str,
    description: str,
    source: str,
    unit_cost: float,
    qty: float,
    sourcing_link: str,
    schema: str,
    status: str,
    parent_pn: str,
):
    """Write a single BOM row at the given position with sync tracking."""
    from . import pull as _pull  # avoid circular import at module level

    _pull._set_cell_string(sheet, sf.COL_ITEM, row, "")
    _pull._set_cell_string(sheet, sf.COL_LEVEL, row, "")
    _pull._set_cell_string(sheet, sf.COL_SOURCE, row, source)
    _pull._set_cell_string(sheet, sf.COL_PN, row, pn)
    _pull._set_cell_string(sheet, sf.COL_DESCRIPTION, row, description)
    _pull._set_cell_string(sheet, sf.COL_SELLER_DESC, row, "")

    if unit_cost:
        _pull._set_cell_float(sheet, sf.COL_UNIT_COST, row, unit_cost)
    _pull._set_cell_float(sheet, sf.COL_QTY, row, qty)

    # Ext Cost formula
    ext_formula = f"={sf.col_letter(sf.COL_UNIT_COST)}{row + 1}*{sf.col_letter(sf.COL_QTY)}{row + 1}"
    _pull._set_cell_formula(sheet, sf.COL_EXT_COST, row, ext_formula)

    _pull._set_cell_string(sheet, sf.COL_SOURCING_LINK, row, sourcing_link)
    _pull._set_cell_string(sheet, sf.COL_SCHEMA, row, schema)

    # Build row cells for hash computation
    row_cells = [""] * sf.BOM_TOTAL_COLS
    row_cells[sf.COL_SOURCE] = source
    row_cells[sf.COL_PN] = pn
    row_cells[sf.COL_DESCRIPTION] = description
    row_cells[sf.COL_UNIT_COST] = str(unit_cost) if unit_cost else ""
    row_cells[sf.COL_QTY] = str(qty)
    row_cells[sf.COL_SOURCING_LINK] = sourcing_link
    row_cells[sf.COL_SCHEMA] = schema

    sync_engine.update_row_sync_state(row_cells, status, parent_pn=parent_pn)
    _pull._set_cell_string(sheet, sf.COL_ROW_HASH, row, row_cells[sf.COL_ROW_HASH])
    _pull._set_cell_string(sheet, sf.COL_ROW_STATUS, row, row_cells[sf.COL_ROW_STATUS])
    _pull._set_cell_string(sheet, sf.COL_UPDATED_AT, row, row_cells[sf.COL_UPDATED_AT])
    _pull._set_cell_string(sheet, sf.COL_PARENT_PN, row, row_cells[sf.COL_PARENT_PN])

    # Colour the row
    color = _pull._STATUS_COLORS.get(status)
    if color:
        _pull._set_row_bg(sheet, row, sf.BOM_TOTAL_COLS, color)