from typing import Generic, TypeVar

from pydantic import BaseModel, ConfigDict, Field
from pydantic.json_schema import SkipJsonSchema


# Action Input Models
class ExtractAction(BaseModel):
	query: str
	extract_links: bool = Field(
		default=False, description='Set True to true if the query requires links, else false to safe tokens'
	)
	extract_images: bool = Field(
		default=False,
		description='Set True to include image src URLs in extracted markdown. Auto-enabled when query contains image-related keywords.',
	)
	start_from_char: int = Field(
		default=0, description='Use this for long markdowns to start from a specific character (not index in browser_state)'
	)
	output_schema: SkipJsonSchema[dict | None] = Field(
		default=None,
		description='Optional JSON Schema dict. When provided, extraction returns validated JSON matching this schema instead of free-text.',
	)
	already_collected: list[str] = Field(
		default_factory=list,
		description='Item identifiers (name, URL, or ID) already collected in prior extract calls on other pages. The extractor will skip items matching these to prevent duplicates. Use when paginating across multiple pages.',
	)


class SearchPageAction(BaseModel):
	pattern: str = Field(description='Text or regex pattern to search for in page content')
	regex: bool = Field(default=False, description='Treat pattern as regex (default: literal text match)')
	case_sensitive: bool = Field(default=False, description='Case-sensitive search (default: case-insensitive)')
	context_chars: int = Field(default=150, description='Characters of surrounding context per match')
	css_scope: str | None = Field(default=None, description='CSS selector to limit search scope (e.g. "div#main")')
	max_results: int = Field(default=25, description='Maximum matches to return')


class FindElementsAction(BaseModel):
	selector: str = Field(description='CSS selector to query elements (e.g. "table tr", "a.link", "div.product")')
	attributes: list[str] | None = Field(
		default=None,
		description='Specific attributes to extract (e.g. ["href", "src", "class"]). If not set, returns tag and text only.',
	)
	max_results: int = Field(default=50, description='Maximum elements to return')
	include_text: bool = Field(default=True, description='Include text content of each element')


class SearchAction(BaseModel):
	query: str
	engine: str = Field(
		default='duckduckgo', description='duckduckgo, google, bing (use duckduckgo by default because less captchas)'
	)


# Backward compatibility alias
SearchAction = SearchAction


class NavigateAction(BaseModel):
	url: str
	new_tab: bool = Field(default=False)


# Backward compatibility alias
GoToUrlAction = NavigateAction


class ClickElementAction(BaseModel):
	index: int | None = Field(default=None, ge=1, description='Element index from browser_state')
	coordinate_x: int | None = Field(default=None, description='Horizontal coordinate relative to viewport left edge')
	coordinate_y: int | None = Field(default=None, description='Vertical coordinate relative to viewport top edge')
	# expect_download: bool = Field(default=False, description='set True if expecting a download, False otherwise')  # moved to downloads_watchdog.py
	# click_count: int = 1  # TODO


class ClickElementActionIndexOnly(BaseModel):
	model_config = ConfigDict(title='ClickElementAction')

	index: int = Field(ge=1, description='Element index from browser_state')


class InputTextAction(BaseModel):
	index: int = Field(ge=0, description='from browser_state')
	text: str = Field(description='Text to enter. With clear=True, text="" clears the field without typing.')
	clear: bool = Field(default=True, description='Clear existing text before typing. Set to False to append instead.')


class DoneAction(BaseModel):
	text: str = Field(
		description=(
			'Final message to the user. '
			'ONLY report data you directly observed in browser_state, tool outputs, or screenshots during this session. '
			'Do NOT use training knowledge to fill gaps — if information was not found on the page, say so explicitly. '
			'Do NOT claim completion of steps from compacted_memory or prior session summaries '
			'unless you explicitly verified them yourself. '
			'If uncertain whether a prior step completed, say so explicitly.'
		)
	)
	success: bool = Field(default=True, description='True if user_request completed successfully')
	files_to_display: list[str] | None = Field(default=[])


T = TypeVar('T', bound=BaseModel)


def _hide_internal_fields_from_schema(schema: dict) -> None:
	"""Remove internal fields from the JSON schema to avoid collisions with user models."""
	props = schema.get('properties', {})
	props.pop('success', None)
	props.pop('files_to_display', None)


class StructuredOutputAction(BaseModel, Generic[T]):
	model_config = ConfigDict(json_schema_extra=_hide_internal_fields_from_schema)

	success: bool = Field(default=True, description='True if user_request completed successfully')
	data: T = Field(description='The actual output data matching the requested schema')
	files_to_display: list[str] | None = Field(default=[])


class SwitchTabAction(BaseModel):
	tab_id: str = Field(min_length=4, max_length=4, description='4-char id')


class CloseTabAction(BaseModel):
	tab_id: str = Field(min_length=4, max_length=4, description='4-char id')


class ScrollAction(BaseModel):
	down: bool = Field(default=True, description='down=True=scroll down, down=False scroll up')
	pages: float = Field(default=1.0, description='0.5=half page, 1=full page, 10=to bottom/top')
	index: int | None = Field(default=None, description='Optional element index to scroll within specific element')


class SendKeysAction(BaseModel):
	keys: str = Field(description='keys (Escape, Enter, PageDown) or shortcuts (Control+o)')


class UploadFileAction(BaseModel):
	index: int
	path: str


class NoParamsAction(BaseModel):
	model_config = ConfigDict(extra='ignore')

	# Optional field required by Gemini API which errors on empty objects in response_schema
	description: str | None = Field(None, description='Optional description for the action')


class ScreenshotAction(BaseModel):
	model_config = ConfigDict(extra='ignore')

	file_name: str | None = Field(
		default=None,
		description='If provided, saves screenshot to this file and returns path. Otherwise screenshot is included in next observation.',
	)


class SaveAsPdfAction(BaseModel):
	file_name: str | None = Field(
		default=None,
		description='Output PDF filename (without path). Defaults to page title. Extension .pdf is added automatically if missing.',
	)
	print_background: bool = Field(default=True, description='Include background graphics and colors')
	landscape: bool = Field(default=False, description='Use landscape orientation')
	scale: float = Field(default=1.0, ge=0.1, le=2.0, description='Scale of the webpage rendering (0.1 to 2.0)')
	paper_format: str = Field(
		default='Letter',
		description='Paper size: Letter, Legal, A4, A3, or Tabloid',
	)
	display_header_footer: bool = Field(
		default=True,
		description=(
			'Print page metadata into the margins, matching the browser Print dialog default: '
			'the date in the header and the page URL plus page numbers in the footer. '
			'Set to False for a clean PDF with no header/footer.'
		),
	)
	header_template: str | None = Field(
		default=None,
		description=(
			'Custom HTML for the page header. Inject values with spans using the classes '
			'date, title, url, pageNumber, totalPages (e.g. \'<span class="title"></span>\'). '
			'Set an explicit font-size or the text renders invisibly. Only used when '
			'display_header_footer is True; defaults to showing the date.'
		),
	)
	footer_template: str | None = Field(
		default=None,
		description=(
			'Custom HTML for the page footer, same format as header_template. Only used when '
			'display_header_footer is True; defaults to showing the page URL and page numbers.'
		),
	)


class GetDropdownOptionsAction(BaseModel):
	index: int


class SelectDropdownOptionAction(BaseModel):
	index: int
	text: str = Field(description='exact text/value')
