from __future__ import annotations

import pytest
from pydantic import ValidationError

from wf_authoring import (
    WorkflowBuilder,
    build_registry,
    coalesce,
    concat,
    constant,
    default_if_none,
    extract_field,
    extract_text_content,
    filter_items,
    filter_items_present,
    first_item,
    first_item_maybe,
    first_item_or_none,
    input_from,
    is_empty,
    last_item,
    last_item_or_none,
    length,
    output_to,
    pick_key,
    pick_path,
    project_fields,
    rename_fields,
    runtime_error,
    state_path,
    truthy,
)
from wf_core import (
    RunStatus,
    RuntimeContext,
    SchemaRef,
    StateSchema,
    WorkflowExecutionError,
    execute_workflow,
)


def _build_first_workflow(use_safe_first: bool = False):
    spec = first_item_or_none if use_safe_first else first_item
    builder = WorkflowBuilder(
        name="first_demo",
        input_schema=SchemaRef(type="object"),
        state_schema=StateSchema.model_validate(
            {
                "type": "object",
                "properties": {
                    "items": {"type": "array"},
                    "item": {"type": ["string", "null"]},
                },
            }
        ),
        output_schema=SchemaRef(type="object"),
        start="pick_first",
    )
    node = builder.use(
        spec,
        id="pick_first",
        input=[input_from(state_path("items"), "items")],
        output=[output_to("item", state_path("item"))],
    )
    builder.connect(node, "ok", "__end__")
    return builder.compile(), build_registry(spec)


def _build_first_maybe_workflow():
    builder = WorkflowBuilder(
        name="first_maybe_demo",
        input_schema=SchemaRef(type="object"),
        state_schema=StateSchema.model_validate(
            {
                "type": "object",
                "properties": {
                    "items": {"type": "array"},
                    "item": {"type": ["string", "null"]},
                    "missing": {"type": "boolean"},
                },
            }
        ),
        output_schema=SchemaRef(type="object"),
        start="pick_first",
    )
    pick_first = builder.use(
        first_item_maybe,
        id="pick_first",
        input=[input_from(state_path("items"), "items")],
        output=[output_to("item", state_path("item"))],
    )
    mark_missing = builder.use(
        first_item_or_none,
        id="mark_missing",
        input=[input_from(state_path("items"), "items")],
        output=[output_to("item", state_path("item"))],
    )
    builder.connect(pick_first, "found", "__end__")
    builder.connect(pick_first, "missing", mark_missing)
    builder.connect(mark_missing, "ok", "__end__")
    return builder.compile(), build_registry(first_item_maybe, first_item_or_none)


def test_first_item_selects_first_value_through_workflow() -> None:
    workflow, registry = _build_first_workflow()

    run = execute_workflow(workflow, {"items": ["a", "b"]}, registry)

    assert run.status == RunStatus.COMPLETED
    assert run.state["item"] == "a"


def test_first_item_fails_on_empty_sequence() -> None:
    workflow, registry = _build_first_workflow()

    with pytest.raises(
        WorkflowExecutionError,
        match=r"node input for pick_first\['items'\]: \[\] should be non-empty",
    ):
        execute_workflow(workflow, {"items": []}, registry)


def test_first_item_or_none_returns_none_for_empty_sequence() -> None:
    workflow, registry = _build_first_workflow(use_safe_first=True)

    run = execute_workflow(workflow, {"items": []}, registry)

    assert run.status == RunStatus.COMPLETED
    assert run.state["item"] is None


def test_first_item_maybe_routes_found_outcome() -> None:
    workflow, registry = _build_first_maybe_workflow()

    run = execute_workflow(workflow, {"items": ["a", "b"]}, registry)

    assert run.status == RunStatus.COMPLETED
    assert run.state["item"] == "a"
    assert run.trace[0].outcome == "found"


def test_first_item_maybe_routes_missing_outcome() -> None:
    workflow, registry = _build_first_maybe_workflow()

    run = execute_workflow(workflow, {"items": []}, registry)

    assert run.status == RunStatus.COMPLETED
    assert run.state["item"] is None
    assert run.trace[0].outcome == "missing"


def test_last_item_selects_last_value() -> None:
    registry = build_registry(last_item)

    result = registry["authoring.last_item"](
        {"items": ["a", "b"]},
        RuntimeContext(current_node_id="last"),
    )

    assert result == {"outcome": "ok", "output": {"item": "b"}}


def test_last_item_fails_on_empty_sequence() -> None:
    registry = build_registry(last_item)

    with pytest.raises(ValidationError, match="List should have at least 1 item"):
        registry["authoring.last_item"](
            {"items": []},
            RuntimeContext(current_node_id="last"),
        )


def test_last_item_or_none_returns_none_for_empty_sequence() -> None:
    registry = build_registry(last_item_or_none)

    result = registry["authoring.last_item_or_none"](
        {"items": []},
        RuntimeContext(current_node_id="last"),
    )

    assert result == {"outcome": "ok", "output": {"item": None}}


def test_length_counts_items() -> None:
    registry = build_registry(length)

    result = registry["authoring.length"](
        {"items": ["a", "b", "c"]},
        RuntimeContext(current_node_id="length"),
    )

    assert result == {"outcome": "ok", "output": {"count": 3}}


def test_is_empty_detects_empty_sequence() -> None:
    registry = build_registry(is_empty)

    result = registry["authoring.is_empty"](
        {"items": []},
        RuntimeContext(current_node_id="is_empty"),
    )

    assert result == {"outcome": "ok", "output": {"value": True}}


def test_coalesce_returns_value_or_fallback() -> None:
    registry = build_registry(coalesce)
    ctx = RuntimeContext(current_node_id="coalesce")

    present = registry["authoring.coalesce"](
        {"value": "x", "fallback": "fallback"},
        ctx,
    )
    missing = registry["authoring.coalesce"](
        {"value": None, "fallback": "fallback"},
        ctx,
    )

    assert present == {"outcome": "ok", "output": {"value": "x"}}
    assert missing == {"outcome": "ok", "output": {"value": "fallback"}}


def test_default_if_none_is_coalesce_alias() -> None:
    registry = build_registry(default_if_none)

    result = registry["authoring.default_if_none"](
        {"value": None, "fallback": "fallback"},
        RuntimeContext(current_node_id="default_if_none"),
    )

    assert default_if_none.name == "authoring.default_if_none"
    assert default_if_none.fn is coalesce.fn
    assert result == {"outcome": "ok", "output": {"value": "fallback"}}


def test_constant_returns_configured_value() -> None:
    registry = build_registry(constant)

    result = registry["authoring.constant"](
        {"value": {"source": "fixture"}},
        RuntimeContext(current_node_id="constant"),
    )

    assert result == {"outcome": "ok", "output": {"value": {"source": "fixture"}}}


def test_pick_key_selects_value_from_mapping() -> None:
    registry = build_registry(pick_key)

    result = registry["authoring.pick_key"](
        {"mapping": {"name": "Ada", "age": 36}, "key": "name"},
        RuntimeContext(current_node_id="pick_key"),
    )

    assert result == {"outcome": "ok", "output": {"value": "Ada"}}


def test_pick_key_returns_none_when_missing() -> None:
    registry = build_registry(pick_key)

    result = registry["authoring.pick_key"](
        {"mapping": {"name": "Ada"}, "key": "missing"},
        RuntimeContext(current_node_id="pick_key"),
    )

    assert result == {"outcome": "ok", "output": {"value": None}}


def test_pick_path_selects_nested_value() -> None:
    registry = build_registry(pick_path)

    result = registry["authoring.pick_path"](
        {"mapping": {"result": {"status": "done"}}, "path": "result.status"},
        RuntimeContext(current_node_id="pick_path"),
    )

    assert result == {"outcome": "ok", "output": {"value": "done"}}


def test_project_fields_selects_named_keys() -> None:
    registry = build_registry(project_fields)

    result = registry["authoring.project_fields"](
        {
            "mapping": {"status": "done", "message": "ok", "debug": True},
            "fields": ["status", "message"],
        },
        RuntimeContext(current_node_id="project_fields"),
    )

    assert result == {
        "outcome": "ok",
        "output": {"mapping": {"status": "done", "message": "ok"}},
    }


def test_rename_fields_remaps_existing_keys() -> None:
    registry = build_registry(rename_fields)

    result = registry["authoring.rename_fields"](
        {
            "mapping": {"provider_status": "done", "provider_message": "ok"},
            "renames": {"provider_status": "status", "provider_message": "message"},
        },
        RuntimeContext(current_node_id="rename_fields"),
    )

    assert result == {
        "outcome": "ok",
        "output": {"mapping": {"status": "done", "message": "ok"}},
    }


def test_filter_items_selects_mapping_items_by_exact_match() -> None:
    registry = build_registry(filter_items)

    result = registry["authoring.filter_items"](
        {
            "items": [
                {"type": "text", "text": "a"},
                {"type": "image", "url": "img://1"},
                {"type": "text", "text": "b"},
            ],
            "key": "type",
            "value": "text",
        },
        RuntimeContext(current_node_id="filter_items"),
    )

    output = result["output"]
    assert result["outcome"] == "ok"
    assert output["items"][0]["text"] == "a"
    assert output["items"][1]["text"] == "b"


def test_filter_items_present_selects_mapping_items_containing_key() -> None:
    registry = build_registry(filter_items_present)

    result = registry["authoring.filter_items_present"](
        {
            "items": [
                {"text": "a"},
                {"url": "img://1"},
                {"text": None},
            ],
            "key": "text",
        },
        RuntimeContext(current_node_id="filter_items_present"),
    )

    output = result["output"]
    assert result["outcome"] == "ok"
    assert output["items"][0]["text"] == "a"
    assert output["items"][1]["text"] is None


def test_extract_field_returns_existing_field_values() -> None:
    registry = build_registry(extract_field)

    result = registry["authoring.extract_field"](
        {
            "items": [
                {"text": "a"},
                {"url": "img://1"},
                {"text": "b"},
            ],
            "field": "text",
        },
        RuntimeContext(current_node_id="extract_field"),
    )

    assert result["outcome"] == "ok"
    assert result["output"]["values"] == ["a", "b"]


def test_concat_joins_strings_with_separator() -> None:
    registry = build_registry(concat)

    result = registry["authoring.concat"](
        {"items": ["a", "b", "c"], "separator": "\n"},
        RuntimeContext(current_node_id="concat"),
    )

    assert result["outcome"] == "ok"
    assert result["output"]["text"] == "a\nb\nc"


def test_non_empty_sequence_models_publish_min_items_without_changing_empty_aware_ops() -> (
    None
):
    assert (
        first_item.input_model.model_json_schema()["properties"]["items"]["minItems"]
        == 1
    )
    assert (
        last_item.input_model.model_json_schema()["properties"]["items"]["minItems"]
        == 1
    )
    assert (
        "minItems"
        not in first_item_maybe.input_model.model_json_schema()["properties"]["items"]
    )
    assert (
        "minItems"
        not in first_item_or_none.input_model.model_json_schema()["properties"]["items"]
    )
    assert (
        "minItems"
        not in last_item_or_none.input_model.model_json_schema()["properties"]["items"]
    )


def test_extract_text_content_recipe_filters_extracts_and_joins_text_blocks() -> None:
    registry = build_registry(extract_text_content)

    result = registry["authoring.extract_text_content"](
        {
            "content": [
                {"type": "text", "text": "hello"},
                {"type": "image", "url": "img://1"},
                {"type": "text", "text": "world"},
            ],
            "separator": " ",
        },
        RuntimeContext(current_node_id="extract_text_content"),
    )

    assert result["outcome"] == "ok"
    assert result["output"]["text"] == "hello world"


def test_truthy_routes_truthy_and_falsey_outcomes() -> None:
    registry = build_registry(truthy)
    ctx = RuntimeContext(current_node_id="truthy")

    truthy_result = registry["authoring.truthy"]({"value": "yes"}, ctx)
    falsey_result = registry["authoring.truthy"]({"value": ""}, ctx)

    assert truthy_result == {"outcome": "truthy", "output": {"value": True}}
    assert falsey_result == {"outcome": "falsey", "output": {"value": False}}


def test_runtime_error_raises_with_message_and_details() -> None:
    registry = build_registry(runtime_error)

    with pytest.raises(RuntimeError, match="bad branch"):
        registry["authoring.runtime_error"](
            {"message": "bad branch", "details": {"step": "demo"}},
            RuntimeContext(current_node_id="runtime_error"),
        )