from __future__ import annotations

import base64
import io
import json
import threading
from dataclasses import dataclass
from pathlib import Path
from typing import Any

from PIL import Image

from agentic_upsampling.clients import ImageGenerationClient, PromptRewriterClient
from agentic_upsampling.constants import (
    DEFAULT_CRITIC_ENDPOINT_URL,
    DEFAULT_CRITIC_MODEL,
    DEFAULT_FLOW_SHIFT,
    DEFAULT_GENERATION_EXTRA_ARGS,
    DEFAULT_GENERATION_MODEL,
    DEFAULT_LLM_EXTRA_BODY,
    DEFAULT_REWRITER_MODEL,
)
from agentic_upsampling.data import PromptItem, load_prompt_items, prompt_dir_name
from agentic_upsampling.extract_best import extract_best_images
from agentic_upsampling.prompt_upsampler import (
    Text2ImagePromptUpsampler,
    apply_t2i_output_parameters,
    normalize_openai_base_url,
)
from agentic_upsampling.rubric import parse_analysis_response
from agentic_upsampling.runner import AgenticUpsamplerRunner, RunnerConfig


def _item(prompt_id: str = "1", prompt: str = "a red cube") -> PromptItem:
    return PromptItem(prompt_id=prompt_id, row_number=0, prompt=prompt)


def _valid_t2i_prompt(caption: str) -> dict[str, Any]:
    return {
        "subjects": [],
        "subject_details": {},
        "background_setting": "plain studio",
        "lighting": {"conditions": "soft", "direction": "front", "shadows": "soft", "illumination_effect": "clear"},
        "aesthetics": {
            "composition": "centered",
            "color_scheme": "balanced",
            "mood_atmosphere": "precise",
            "patterns": "",
        },
        "cinematography": {
            "framing": "centered",
            "camera_angle": "eye-level",
            "depth_of_field": "deep",
            "focus": "sharp",
            "lens_focal_length": "standard",
        },
        "style_medium": "digital render",
        "artistic_style": "clean realistic render",
        "context": "test prompt",
        "text_and_signage_elements": [],
        "quadrant_scan": {
            "top_left": "",
            "top_right": "",
            "bottom_left": "",
            "bottom_right": "",
            "absolute_center": "",
        },
        "comprehensive_t2i_caption": caption,
        "resolution": {"H": 960, "W": 960},
        "aspect_ratio": "1,1",
    }


class FakeChatClient:
    messages: list[dict[str, Any]]
    response_format_json: bool

    def __init__(self, response: dict[str, Any]) -> None:
        self.response = response
        self.messages = []
        self.response_format_json = False

    def complete(self, messages: list[dict[str, Any]], *, response_format_json: bool = False) -> str:
        self.messages = messages
        self.response_format_json = response_format_json
        return json.dumps(self.response)


def test_defaults_are_public_provider_defaults() -> None:
    assert DEFAULT_REWRITER_MODEL == "gpt-5.5"
    assert DEFAULT_LLM_EXTRA_BODY == {"reasoning_effort": "low"}
    assert DEFAULT_CRITIC_MODEL == "gemini-3.1-pro-preview"
    assert DEFAULT_CRITIC_ENDPOINT_URL == "https://generativelanguage.googleapis.com/v1beta/openai/"


def test_gemini_openai_compatible_base_url_is_not_modified() -> None:
    assert (
        normalize_openai_base_url("https://generativelanguage.googleapis.com/v1beta/openai/")
        == "https://generativelanguage.googleapis.com/v1beta/openai"
    )
    assert (
        normalize_openai_base_url("https://generativelanguage.googleapis.com/v1beta/openai/chat/completions")
        == "https://generativelanguage.googleapis.com/v1beta/openai"
    )


def test_prompt_loaders_support_text_jsonl_and_csv(tmp_path: Path) -> None:
    txt_path = tmp_path / "prompts.txt"
    txt_path.write_text("one\n\ntwo\n", encoding="utf-8")
    assert [item.prompt for item in load_prompt_items(prompts_path=txt_path)] == ["one", "two"]

    jsonl_path = tmp_path / "prompts.jsonl"
    jsonl_path.write_text('{"id":"custom id","prompt":"three"}\n"four"\n', encoding="utf-8")
    jsonl_items = load_prompt_items(prompts_path=jsonl_path)
    assert [item.prompt for item in jsonl_items] == ["three", "four"]
    assert prompt_dir_name(jsonl_items[0]) == "custom_id"

    csv_path = tmp_path / "prompts.csv"
    csv_path.write_text("id,prompt\nfive_id,five\n", encoding="utf-8")
    csv_items = load_prompt_items(prompts_path=csv_path)
    assert csv_items[0].prompt_id == "five_id"
    assert csv_items[0].prompt == "five"


def test_prompt_upsampler_applies_resolution_and_requests_json() -> None:
    prompt_json = _valid_t2i_prompt("initial cube prompt")
    fake_client = FakeChatClient(prompt_json)
    upsampler = Text2ImagePromptUpsampler(fake_client)  # type: ignore[arg-type]

    result = upsampler.upsample("a cube", prompt_id="cube", resolution="720", aspect_ratio="16,9")

    assert result["resolution"] == {"H": 720, "W": 1280}
    assert result["aspect_ratio"] == "16,9"
    assert fake_client.response_format_json is True


def test_apply_t2i_output_parameters_rejects_bad_canvas() -> None:
    try:
        apply_t2i_output_parameters(_valid_t2i_prompt("x"), resolution="999", aspect_ratio="1,1")
    except ValueError as exc:
        assert "Unsupported resolution" in str(exc)
    else:
        raise AssertionError("Expected unsupported resolution error.")


def test_prompt_rewriter_joint_rewrite_uses_vlm_feedback() -> None:
    previous_prompt = _valid_t2i_prompt("old cube prompt")
    rewritten_prompt = _valid_t2i_prompt("new cube prompt with no 4x4 grid")
    analysis = {
        "overall_score": 2.0,
        "prompt_adherence_score": 3.0,
        "category_score": 3.0,
        "issues": [
            {
                "category": "geometry",
                "description": "Generated a 4x4 grid instead of a 3x3 cube.",
                "severity": "severe",
            }
        ],
        "improvement_directives": ["Strictly enforce 3x3x3 geometry."],
        "raw_response": "large omitted blob",
    }
    rewriter = PromptRewriterClient(api_token="unused")
    fake_client = FakeChatClient({"positive_prompt": rewritten_prompt, "negative_prompt": "4x4 grid"})
    rewriter.rewrite_client = fake_client  # type: ignore[assignment]

    positive_prompt, negative_prompt = rewriter.rewrite_prompt_pair(
        _item("39", "A Rubik's cube mid twist with the top layer rotated exactly 45 degrees"),
        previous_prompt,
        "",
        analysis,
        [{"iteration": 0, "analysis": analysis}],
    )

    assert positive_prompt["comprehensive_t2i_caption"] == "new cube prompt with no 4x4 grid"
    assert negative_prompt == "4x4 grid"
    assert fake_client.response_format_json is True
    user_message = str(fake_client.messages[1]["content"])
    assert "Generated a 4x4 grid" in user_message
    assert "Strictly enforce 3x3x3 geometry" in user_message
    assert "raw_response" not in user_message


def test_generation_payload_uses_vllm_omni_images_api() -> None:
    client = ImageGenerationClient(endpoint="https://example.test/v1", model="test/model")
    payload = client.build_payload({"comprehensive_t2i_caption": "x"}, prompt_id="3", seed=100, negative_prompt="blur")

    assert client.endpoint == "https://example.test"
    assert payload["model"] == "test/model"
    assert payload["prompt"] == '{"comprehensive_t2i_caption":"x"}'
    assert payload["size"] == "1024x1024"
    assert payload["n"] == 1
    assert payload["response_format"] == "b64_json"
    assert payload["negative_prompt"] == "blur"
    assert payload["num_inference_steps"] == 50
    assert payload["guidance_scale"] == 4.0
    assert payload["flow_shift"] == DEFAULT_FLOW_SHIFT
    assert payload["extra_args"] == DEFAULT_GENERATION_EXTRA_ARGS
    assert payload["seed"] == 100
    assert "model_mode" not in payload
    assert "prompt_upsampling" not in payload


def test_generation_payload_allows_custom_extra_args() -> None:
    client = ImageGenerationClient(endpoint="https://example.test", extra_args={"guardrails": True})
    payload = client.build_payload({"comprehensive_t2i_caption": "x"}, prompt_id="3")

    assert payload["extra_args"] == {"guardrails": True}


class FakeImageResponse:
    ok: bool = True
    status_code: int = 200
    text: str = "ok"

    def __init__(self, payload: dict[str, Any]) -> None:
        self.payload = payload

    def json(self) -> dict[str, Any]:
        return self.payload


class FakeImageSession:
    calls: list[dict[str, Any]]

    def __init__(self, response_payload: dict[str, Any]) -> None:
        self.response_payload = response_payload
        self.calls = []

    def request(self, method: str, url: str, **kwargs: Any) -> FakeImageResponse:
        self.calls.append({"method": method, "url": url, "kwargs": kwargs})
        return FakeImageResponse(self.response_payload)


def _tiny_png_b64() -> str:
    buf = io.BytesIO()
    Image.new("RGB", (4, 4), (0, 255, 0)).save(buf, format="PNG")
    return base64.b64encode(buf.getvalue()).decode("ascii")


def test_generation_client_decodes_vllm_omni_b64_response(tmp_path: Path) -> None:
    session = FakeImageSession({"created": 1, "data": [{"b64_json": _tiny_png_b64(), "revised_prompt": None}]})
    client = ImageGenerationClient(endpoint="example.test", auth_key="secret-token", session=session)  # type: ignore[arg-type]

    result = client.generate(prompt_json=_valid_t2i_prompt("x"), prompt_id="3", output_dir=tmp_path, seed=5)

    assert result.image_path.exists()
    assert session.calls[0]["method"] == "POST"
    assert session.calls[0]["url"] == "https://example.test/v1/images/generations"
    assert session.calls[0]["kwargs"]["headers"] == {"Authorization": "Bearer secret-token"}
    assert session.calls[0]["kwargs"]["json"]["model"] == DEFAULT_GENERATION_MODEL
    meta = json.loads(result.meta_path.read_text(encoding="utf-8"))
    assert meta["status"] == "completed"
    assert meta["response"]["data"][0]["b64_json"].startswith("<base64 image omitted:")


def test_parse_analysis_response_sets_threshold_flag() -> None:
    analysis = parse_analysis_response(
        """
        {
          "prompt_adherence_score": 9,
          "visual_quality_score": 9,
          "aesthetics_score": 8.5,
          "physical_plausibility_score": 8,
          "category_score": 9,
          "text_rendering_score": 9,
          "photorealism_score": null,
          "overall_score": 9.1,
          "issues": [],
          "category_findings": {},
          "improvement_directives": [],
          "rationale": "Strong."
        }
        """,
    )
    assert analysis["threshold_cleared"] is True


class FakeRewriter:
    initial_calls: int
    joint_rewrite_calls: int
    previous_scores: list[float]

    def __init__(self) -> None:
        self.initial_calls = 0
        self.joint_rewrite_calls = 0
        self.previous_scores = []

    def initial_prompt(self, item: PromptItem) -> dict[str, Any]:
        self.initial_calls += 1
        return _valid_t2i_prompt(f"initial {item.prompt_id}")

    def rewrite_prompt_pair(
        self,
        item: PromptItem,
        previous_prompt: dict[str, Any],
        previous_negative_prompt: str,
        previous_analysis: dict[str, Any],
        history: list[dict[str, Any]],
    ) -> tuple[dict[str, Any], str]:
        self.joint_rewrite_calls += 1
        self.previous_scores.append(float(previous_analysis["overall_score"]))
        return _valid_t2i_prompt(f"rewrite {len(history)}"), f"negative {len(history)}"


@dataclass(frozen=True, slots=True)
class FakeGeneration:
    image_path: Path
    meta_path: Path
    meta: dict[str, Any]


class FakeGenerator:
    seeds: list[int | None]
    negative_prompts: list[str]

    def __init__(self) -> None:
        self.seeds = []
        self.negative_prompts = []

    def generate(
        self,
        *,
        prompt_json: dict[str, Any],
        prompt_id: str,
        output_dir: Path,
        seed: int | None = None,
        negative_prompt: str = "",
        jpeg_quality: int = 95,
    ) -> FakeGeneration:
        self.seeds.append(seed)
        self.negative_prompts.append(negative_prompt)
        output_dir.mkdir(parents=True, exist_ok=True)
        image_path = output_dir / "image.jpg"
        Image.new("RGB", (8, 8), (255, 0, 0)).save(image_path)
        meta_path = output_dir / "generation_meta.json"
        meta_path.write_text('{"status":"completed"}\n', encoding="utf-8")
        return FakeGeneration(image_path=image_path, meta_path=meta_path, meta={"status": "completed"})


class BarrierGenerator(FakeGenerator):
    barrier: threading.Barrier
    lock: threading.Lock

    def __init__(self, parties: int) -> None:
        super().__init__()
        self.barrier = threading.Barrier(parties)
        self.lock = threading.Lock()

    def generate(
        self,
        *,
        prompt_json: dict[str, Any],
        prompt_id: str,
        output_dir: Path,
        seed: int | None = None,
        negative_prompt: str = "",
        jpeg_quality: int = 95,
    ) -> FakeGeneration:
        with self.lock:
            self.seeds.append(seed)
            self.negative_prompts.append(negative_prompt)
        self.barrier.wait(timeout=2.0)
        output_dir.mkdir(parents=True, exist_ok=True)
        image_path = output_dir / "image.jpg"
        Image.new("RGB", (8, 8), (255, 0, 0)).save(image_path)
        meta_path = output_dir / "generation_meta.json"
        meta_path.write_text('{"status":"completed"}\n', encoding="utf-8")
        return FakeGeneration(image_path=image_path, meta_path=meta_path, meta={"status": "completed"})


class FakeJudge:
    calls: int
    scores: list[float]

    def __init__(self, scores: list[float]) -> None:
        self.calls = 0
        self.scores = scores

    def score_image(
        self,
        *,
        item: PromptItem,
        image_path: Path,
    ) -> dict[str, Any]:
        score = self.scores[self.calls]
        self.calls += 1
        return {
            "overall_score": score,
            "prompt_adherence_score": score,
            "visual_quality_score": score,
            "aesthetics_score": score,
            "physical_plausibility_score": score,
            "category_score": score,
            "issues": [],
            "improvement_directives": [],
            "threshold_cleared": score >= 9,
        }


def test_runner_early_stops_by_default(tmp_path: Path) -> None:
    rewriter = FakeRewriter()
    generator = FakeGenerator()
    runner = AgenticUpsamplerRunner(
        rewriter=rewriter,
        generator=generator,  # type: ignore[arg-type]
        judge=FakeJudge([9.1, 8.0]),
        config=RunnerConfig(output_dir=tmp_path, max_iterations=3, samples_per_iteration=1),
    )

    result = runner.run_item(_item())

    assert result["best_iteration"] == 0
    assert rewriter.initial_calls == 1
    assert rewriter.joint_rewrite_calls == 0
    assert generator.seeds == [None]


def test_runner_can_disable_early_stop_and_select_best_sample(tmp_path: Path) -> None:
    rewriter = FakeRewriter()
    generator = FakeGenerator()
    runner = AgenticUpsamplerRunner(
        rewriter=rewriter,
        generator=generator,  # type: ignore[arg-type]
        judge=FakeJudge([5.0, 9.0, 7.0, 6.0, 10.0, 8.0]),
        config=RunnerConfig(
            output_dir=tmp_path,
            max_iterations=2,
            samples_per_iteration=3,
            seed_base=1000,
            early_stop=False,
        ),
    )

    result = runner.run_item(_item("8", "exactly 12 balloons with exact color counts"))

    assert generator.seeds == [1000, 1001, 1002, 1000, 1001, 1002]
    assert rewriter.previous_scores == [9.0]
    assert result["best_iteration"] == 1
    assert result["best"]["selected_sample_index"] == 1
    assert result["iterations"][0]["selected_sample_index"] == 1


def test_runner_generates_seed_samples_in_parallel(tmp_path: Path) -> None:
    rewriter = FakeRewriter()
    generator = BarrierGenerator(parties=3)
    runner = AgenticUpsamplerRunner(
        rewriter=rewriter,
        generator=generator,  # type: ignore[arg-type]
        judge=FakeJudge([5.0, 6.0, 7.0]),
        config=RunnerConfig(
            output_dir=tmp_path,
            max_iterations=1,
            samples_per_iteration=3,
            seed_base=2000,
            early_stop=False,
        ),
    )

    result = runner.run_item(_item("parallel", "a parallel seed test"))

    assert sorted(generator.seeds) == [2000, 2001, 2002]
    assert result["best"]["selected_sample_index"] == 2
    assert result["iterations"][0]["sample_count"] == 3


def test_extract_best_images_copies_images_and_writes_manifests(tmp_path: Path) -> None:
    output_dir = tmp_path / "run"
    image_dir = output_dir / "0001" / "iter_00"
    image_dir.mkdir(parents=True)
    image_path = image_dir / "image.jpg"
    Image.new("RGB", (8, 8), (255, 0, 0)).save(image_path)
    best_json = {
        "prompt_id": "1",
        "prompt": "a red square",
        "best_iteration": 0,
        "best_score": 9.25,
        "threshold_cleared_any": True,
        "best": {
            "selected_sample_index": 0,
            "image_path": str(image_path),
            "analysis_path": str(image_dir / "analysis.json"),
        },
        "iterations": [],
    }
    (output_dir / "0001" / "best.json").write_text(json.dumps(best_json), encoding="utf-8")

    records = extract_best_images(output_dir, tmp_path / "export")

    assert len(records) == 1
    copied_path = Path(records[0]["copied_image_path"])
    assert copied_path.exists()
    assert copied_path.name == "1.jpg"
    assert (tmp_path / "export" / "best_generations.jsonl").exists()
    assert (tmp_path / "export" / "best_generations.csv").exists()