from __future__ import annotations

from pathlib import Path
from types import SimpleNamespace

from adam.models import ExecutionPlan, PlanStep
from adam.training_assistant import (
    append_preflight_summary,
    build_fine_tune_request,
    build_training_request,
    combine_training_plans,
    completion_recommendation,
    presets_from_config,
    parse_model_batch_names,
    build_dataset_collection_request,
    suggest_existing_dataset,
)


class FakeConfig:
    def __init__(self, values: dict | None = None) -> None:
        self.values = values or {}

    def get(self, key: str, default=None):
        return self.values.get(key, default)


def test_wizard_builds_specific_new_ddpm_request() -> None:
    request = build_training_request(
        trainer="ddpm",
        subject="Luigi",
        dataset_name="",
        create_dataset=True,
        epochs=120,
        image_count=75,
        model_name="Luigi V2",
    )
    assert "dataset of Luigi" in request
    assert "75 images" in request
    assert "Luigi V2" in request
    assert "120 epochs" in request


def test_wizard_embeds_validated_training_options() -> None:
    request = build_training_request(
        trainer="ddpm", subject="Luigi", dataset_name="", create_dataset=True,
        epochs=10, image_count=20, model_name="Luigi", training_options={"resolution": 256, "batch_size": 2},
    )
    assert 'ADAM_TRAINING_OPTIONS:{"batch_size": 2, "resolution": 256}' in request


def test_fine_tune_request_targets_an_existing_model() -> None:
    request = build_fine_tune_request(model_name="Luigi V2", trainer="ddpm", epochs=20)

    assert request.startswith("Fine-tune Luigi V2 for 20 epochs with DDPM.")
    assert '"dataset_mode": "original"' in request


def test_fine_tune_request_can_select_a_new_dataset_and_settings() -> None:
    request = build_fine_tune_request(
        model_name="Luigi V2", trainer="ddpm", epochs=20,
        dataset_mode="new", new_subject="Luigi artwork", image_count=80,
        training_options={"resolution": 256},
    )

    assert '"new_subject": "Luigi artwork"' in request
    assert '"image_count": 80' in request
    assert '"resolution": 256' in request


def test_wizard_can_request_every_available_image() -> None:
    request = build_training_request(
        trainer="ddpm",
        subject="Luigi",
        dataset_name="",
        create_dataset=True,
        epochs=120,
        image_count=75,
        model_name="Luigi V2",
        collection_mode="all_available",
    )

    assert "as many available images" in request


def test_custom_presets_extend_built_in_presets() -> None:
    presets = presets_from_config(
        FakeConfig({"training_presets": {"My Quick Run": {"trainer": "lora", "epochs": 5}}})
    )
    assert "Character LoRA" in presets
    assert presets["My Quick Run"]["epochs"] == 5


def test_preflight_is_saved_in_plan_summary(tmp_path: Path) -> None:
    trainer = tmp_path / "trainer"
    dataset = tmp_path / "dataset"
    output = tmp_path / "output" / "model"
    trainer.mkdir()
    dataset.mkdir()
    (dataset / "one.png").write_bytes(b"image")
    plan = ExecutionPlan(
        request="train",
        summary="Train a model.",
        steps=[
            PlanStep(
                "ddpm_trainer",
                "Train DDPM",
                "Train",
                {"dataset_dir": str(dataset), "output_dir": str(output)},
            )
        ],
    )
    config = FakeConfig({"tool_folders": {"ddpm_trainer": str(trainer)}})

    append_preflight_summary(plan, config)

    assert "Pre-flight:" in plan.summary
    assert "1 images found" in plan.summary
    assert "connected" in plan.summary


def test_training_completion_suggests_preview_review() -> None:
    plan = SimpleNamespace(steps=[SimpleNamespace(tool_id="lora_trainer")])
    assert "preview images" in completion_recommendation(plan)


def test_multiple_model_plans_are_combined_in_order() -> None:
    first = ExecutionPlan(
        request="first", summary="Train first.", project_name="First",
        steps=[PlanStep("ddpm_trainer", "First model", "Train first")],
        requires_confirmation=True,
    )
    second = ExecutionPlan(
        request="second", summary="Train second.", project_name="Second",
        steps=[PlanStep("lora_trainer", "Second model", "Train second")],
        requires_confirmation=True,
    )

    batch = combine_training_plans([first, second])

    assert batch.project_name == "Training batch (2 models)"
    assert [step.title for step in batch.steps] == ["First model", "Second model"]
    assert batch.requires_confirmation is True
    assert "failed step stops the batch" in batch.summary


def test_single_model_plan_is_not_wrapped_as_a_batch() -> None:
    plan = ExecutionPlan(
        request="one", summary="One.",
        steps=[PlanStep("ddpm_trainer", "One model", "Train one")],
    )

    assert combine_training_plans([plan]) is plan


def test_bulk_model_names_are_cleaned_and_deduplicated() -> None:
    assert parse_model_batch_names("1. Luigi\n- EarthBound\nluigi\n\n• South Park") == [
        "Luigi", "EarthBound", "South Park"
    ]


def test_batch_dataset_first_request_does_not_train() -> None:
    request = build_dataset_collection_request("Luigi", image_count=80)

    assert request == "Collect a dataset of 80 images of Luigi."
    assert "train" not in request.casefold()


def test_existing_dataset_match_links_a_clear_name_match(tmp_path: Path) -> None:
    folder = tmp_path / "Luigi S Mansion Dataset"
    folder.mkdir()
    dataset = SimpleNamespace(name=folder.name, path=str(folder))

    match = suggest_existing_dataset(
        {"model_name": "Luigi's Mansion", "subject": "Luigi's Mansion"}, [dataset]
    )

    assert match.status == "matched"
    assert match.dataset_name == "Luigi S Mansion Dataset"


def test_existing_dataset_match_keeps_ambiguous_names_for_manual_selection(tmp_path: Path) -> None:
    first = tmp_path / "Liminal Spaces Dataset"; first.mkdir()
    second = tmp_path / "Liminal Space Images Dataset"; second.mkdir()
    datasets = [
        SimpleNamespace(name=first.name, path=str(first)),
        SimpleNamespace(name=second.name, path=str(second)),
    ]

    match = suggest_existing_dataset({"model_name": "Liminal Space"}, datasets)

    assert match.status == "ambiguous"