"""
Data models for CERNenv: an LHC (Large Hadron Collider) style particle
physics discovery POMDP (Partially Observable Markov Decision Process).

The agent is a Large Language Model (LLM) acting as a high-energy physicist.
Each step it picks one structured action (configure beams, allocate
luminosity, run a trigger, fit a spectrum, request systematics, submit a
discovery claim, etc.) and receives a noisy detector-style observation.
The latent particle and detector parameters are the hidden ground truth.
"""

from __future__ import annotations

from enum import Enum
from typing import Any, Dict, List, Optional

from pydantic import BaseModel, Field

from openenv.core.env_server.types import Action, Observation


# ── Action vocabulary ───────────────────────────────────────────────────────


class ActionType(str, Enum):
    # ── Beam & data acquisition (DAQ) ─────────────────────────────────
    CONFIGURE_BEAM = "configure_beam"
    ALLOCATE_LUMINOSITY = "allocate_luminosity"
    SET_TRIGGER = "set_trigger"
    COLLECT_COLLISIONS = "collect_collisions"

    # ── Reconstruction & calibration ─────────────────────────────────
    CALIBRATE_DETECTOR = "calibrate_detector"
    RECONSTRUCT_TRACKS = "reconstruct_tracks"
    SELECT_CHANNEL = "select_channel"

    # ── Analysis ──────────────────────────────────────────────────────
    BUILD_INVARIANT_MASS = "build_invariant_mass"
    SUBTRACT_BACKGROUND = "subtract_background"
    FIT_RESONANCE = "fit_resonance"
    SCAN_BUMP = "scan_bump"
    MEASURE_ANGULAR = "measure_angular"
    ESTIMATE_SIGNIFICANCE = "estimate_significance"

    # ── Systematics & meta ───────────────────────────────────────────
    REQUEST_SYSTEMATICS = "request_systematics"
    REQUEST_THEORY_REVIEW = "request_theory_review"

    # ── Final ─────────────────────────────────────────────────────────
    SUBMIT_DISCOVERY_CLAIM = "submit_discovery_claim"


DAQ_ACTIONS = frozenset({
    ActionType.CONFIGURE_BEAM,
    ActionType.ALLOCATE_LUMINOSITY,
    ActionType.SET_TRIGGER,
    ActionType.COLLECT_COLLISIONS,
})

RECO_ACTIONS = frozenset({
    ActionType.CALIBRATE_DETECTOR,
    ActionType.RECONSTRUCT_TRACKS,
    ActionType.SELECT_CHANNEL,
})

ANALYSIS_ACTIONS = frozenset({
    ActionType.BUILD_INVARIANT_MASS,
    ActionType.SUBTRACT_BACKGROUND,
    ActionType.FIT_RESONANCE,
    ActionType.SCAN_BUMP,
    ActionType.MEASURE_ANGULAR,
    ActionType.ESTIMATE_SIGNIFICANCE,
})

META_ACTIONS = frozenset({
    ActionType.REQUEST_SYSTEMATICS,
    ActionType.REQUEST_THEORY_REVIEW,
    ActionType.SUBMIT_DISCOVERY_CLAIM,
})


# ── Detector channels & physics primitives ────────────────────────────────


class DetectorChannel(str, Enum):
    """Final-state decay channel the agent reconstructs in.

    Channels affect signal acceptance and background composition. Picking a
    channel where the true particle does not decay yields low signal yield
    no matter how much luminosity is collected — this is intentional.
    """

    DIPHOTON = "diphoton"          # γγ
    DILEPTON_EE = "dilepton_ee"    # e+ e-
    DILEPTON_MUMU = "dilepton_mumu"  # μ+ μ-
    DIJET = "dijet"                # jj
    FOUR_LEPTON = "four_lepton"    # 4ℓ
    BB = "bb"                      # b b-bar


class TriggerType(str, Enum):
    """Hardware-level event selection."""

    LOW_PT = "low_pt"          # broad acceptance, lots of background
    HIGH_PT = "high_pt"        # high-mass focus, lower QCD
    DIPHOTON_HLT = "diphoton_hlt"
    DILEPTON_HLT = "dilepton_hlt"
    JET_HLT = "jet_hlt"


class BeamEnergy(str, Enum):
    """LHC-style center-of-mass energies (TeV)."""

    E_7 = "7TeV"
    E_8 = "8TeV"
    E_13 = "13TeV"
    E_14 = "14TeV"


# ── Tool / instrument registry (for prompts and tool-fit reward) ──────────


class ToolCategory(str, Enum):
    DAQ = "daq"
    RECONSTRUCTION = "reconstruction"
    CALIBRATION = "calibration"
    ANALYSIS = "analysis"
    STATISTICS = "statistics"
    SYSTEMATICS = "systematics"


class ToolSpec(BaseModel):
    name: str
    category: ToolCategory
    description: str = ""
    typical_runtime_hours: float = 0.5
    typical_cost_musd: float = 0.0  # in millions of USD (compute / beam time proxy)
    requires_gpu: bool = False
    channels: List[str] = Field(default_factory=list)


TOOL_REGISTRY: Dict[str, ToolSpec] = {
    "ATLAS_HLT": ToolSpec(
        name="ATLAS_HLT",
        category=ToolCategory.DAQ,
        description="ATLAS High-Level Trigger system for online event selection",
        typical_runtime_hours=0.0,
        channels=["diphoton", "dilepton_ee", "dilepton_mumu", "four_lepton", "dijet", "bb"],
    ),
    "CMS_HLT": ToolSpec(
        name="CMS_HLT",
        category=ToolCategory.DAQ,
        description="CMS High-Level Trigger system",
        typical_runtime_hours=0.0,
        channels=["diphoton", "dilepton_ee", "dilepton_mumu", "four_lepton", "dijet", "bb"],
    ),
    "GEANT4": ToolSpec(
        name="GEANT4",
        category=ToolCategory.RECONSTRUCTION,
        description="Detector simulation toolkit for full event reconstruction",
        typical_runtime_hours=1.0,
        typical_cost_musd=0.05,
        requires_gpu=False,
    ),
    "Athena": ToolSpec(
        name="Athena",
        category=ToolCategory.RECONSTRUCTION,
        description="ATLAS reconstruction framework",
        typical_runtime_hours=0.8,
    ),
    "CMSSW": ToolSpec(
        name="CMSSW",
        category=ToolCategory.RECONSTRUCTION,
        description="CMS reconstruction software",
        typical_runtime_hours=0.8,
    ),
    "ECAL_calibration": ToolSpec(
        name="ECAL_calibration",
        category=ToolCategory.CALIBRATION,
        description="Electromagnetic calorimeter energy-scale calibration",
        typical_runtime_hours=0.3,
    ),
    "Tracker_alignment": ToolSpec(
        name="Tracker_alignment",
        category=ToolCategory.CALIBRATION,
        description="Inner tracker alignment for momentum precision",
        typical_runtime_hours=0.4,
    ),
    "ROOT_RooFit": ToolSpec(
        name="ROOT_RooFit",
        category=ToolCategory.ANALYSIS,
        description="Maximum-likelihood spectrum fitting toolkit",
        typical_runtime_hours=0.2,
    ),
    "MadGraph": ToolSpec(
        name="MadGraph",
        category=ToolCategory.ANALYSIS,
        description="Matrix-element generator for signal+background templates",
        typical_runtime_hours=1.5,
        typical_cost_musd=0.02,
    ),
    "Pythia8": ToolSpec(
        name="Pythia8",
        category=ToolCategory.ANALYSIS,
        description="Parton-shower and hadronisation generator",
        typical_runtime_hours=0.5,
    ),
    "BumpHunter": ToolSpec(
        name="BumpHunter",
        category=ToolCategory.STATISTICS,
        description="Sliding-window local-significance bump-hunting algorithm",
        typical_runtime_hours=0.1,
    ),
    "CLs_fit": ToolSpec(
        name="CLs_fit",
        category=ToolCategory.STATISTICS,
        description="Modified-frequentist CLs limits and significance",
        typical_runtime_hours=0.1,
    ),
    "Asimov_significance": ToolSpec(
        name="Asimov_significance",
        category=ToolCategory.STATISTICS,
        description="Asymptotic significance from Asimov dataset",
        typical_runtime_hours=0.05,
    ),
    "JES_systematics": ToolSpec(
        name="JES_systematics",
        category=ToolCategory.SYSTEMATICS,
        description="Jet energy-scale systematic study",
        typical_runtime_hours=0.4,
    ),
    "Luminosity_calibration": ToolSpec(
        name="Luminosity_calibration",
        category=ToolCategory.SYSTEMATICS,
        description="Van der Meer scan luminosity calibration",
        typical_runtime_hours=0.3,
    ),
}


# ── Action schema ──────────────────────────────────────────────────────────


class ExperimentAction(Action):
    """One structured experimental step at the LHC."""

    action_type: ActionType = Field(
        ...,
        description=(
            "Discrete LHC pipeline step. The environment enforces physics "
            "prerequisites: you cannot fit a spectrum before collecting data, "
            "or claim a discovery before estimating significance."
        ),
    )
    method: Optional[str] = Field(
        None,
        description=(
            "Optional named instrument or framework (e.g. 'ROOT_RooFit', "
            "'BumpHunter', 'Pythia8'). Affects cost, runtime, and tool-fit reward."
        ),
    )
    parameters: Dict[str, Any] = Field(
        default_factory=dict,
        description=(
            "Action-specific settings such as beam energy, integrated luminosity "
            "(fb^-1), trigger selection, decay channel, mass window, fit model."
        ),
    )
    justification: Optional[str] = Field(
        None,
        description="Short scientific rationale for picking this step now.",
    )
    confidence: float = Field(
        0.5, ge=0.0, le=1.0,
        description="Agent confidence in the chosen step.",
    )


# ── Outputs ────────────────────────────────────────────────────────────────


class OutputType(str, Enum):
    BEAM_CONFIG = "beam_config"
    LUMINOSITY_LOG = "luminosity_log"
    TRIGGER_REPORT = "trigger_report"
    COLLISION_BATCH = "collision_batch"
    CALIBRATION_REPORT = "calibration_report"
    RECONSTRUCTION = "reconstruction"
    CHANNEL_SELECTION = "channel_selection"
    INVARIANT_MASS_HIST = "invariant_mass_hist"
    BACKGROUND_SUBTRACTION = "background_subtraction"
    FIT_RESULT = "fit_result"
    BUMP_SCAN = "bump_scan"
    ANGULAR_RESULT = "angular_result"
    SIGNIFICANCE = "significance"
    SYSTEMATICS_REPORT = "systematics_report"
    THEORY_REVIEW = "theory_review"
    DISCOVERY_CLAIM = "discovery_claim"
    FAILURE_REPORT = "failure_report"


class IntermediateOutput(BaseModel):
    """A single noisy detector or analysis artifact."""

    output_type: OutputType
    step_index: int
    success: bool = True
    quality_score: float = Field(1.0, ge=0.0, le=1.0)
    summary: str = ""
    data: Dict[str, Any] = Field(default_factory=dict)
    uncertainty: float = Field(0.0, ge=0.0, le=1.0)
    warnings: List[str] = Field(default_factory=list)
    artifacts_available: List[str] = Field(default_factory=list)


# ── Observable state components ───────────────────────────────────────────


class ResourceUsage(BaseModel):
    """Agent-visible resource counters."""

    budget_used_musd: float = 0.0
    budget_remaining_musd: float = 100.0
    luminosity_used_fb: float = 0.0
    luminosity_remaining_fb: float = 300.0
    time_used_days: float = 0.0
    time_remaining_days: float = 365.0
    compute_hours_used: float = 0.0


class PipelineStepRecord(BaseModel):
    step_index: int
    action_type: ActionType
    method: Optional[str] = None
    parameters: Dict[str, Any] = Field(default_factory=dict)
    output_summary: str = ""
    output_type: OutputType
    success: bool = True
    quality_score: float = 1.0
    cost_musd: float = 0.0
    luminosity_cost_fb: float = 0.0
    time_cost_days: float = 0.0


class PaperReference(BaseModel):
    title: str
    citation: Optional[str] = None
    doi: Optional[str] = None
    arxiv_id: Optional[str] = None
    url: Optional[str] = None


class ExpectedFinding(BaseModel):
    finding: str
    category: str = "claim"
    keywords: List[str] = Field(default_factory=list)


class TaskSpec(BaseModel):
    """The physics question the agent is given for this episode."""

    problem_statement: str = "Discover and characterise an unknown resonance."
    target_collider: str = "LHC"
    beam_energy_options: List[str] = Field(
        default_factory=lambda: [e.value for e in BeamEnergy],
    )
    available_channels: List[str] = Field(
        default_factory=lambda: [c.value for c in DetectorChannel],
    )
    available_triggers: List[str] = Field(
        default_factory=lambda: [t.value for t in TriggerType],
    )
    available_tools: List[str] = Field(
        default_factory=lambda: list(TOOL_REGISTRY.keys()),
    )
    mass_search_window_gev: List[float] = Field(default_factory=lambda: [50.0, 1000.0])
    budget_limit_musd: float = 100.0
    luminosity_budget_fb: float = 300.0
    time_limit_days: float = 365.0
    prior_observations: List[str] = Field(default_factory=list)
    success_criteria: List[str] = Field(default_factory=list)
    paper_references: List[PaperReference] = Field(default_factory=list)
    expected_findings: List[ExpectedFinding] = Field(default_factory=list)
    difficulty: str = "medium"


class DiscoveryClaim(BaseModel):
    """Structured final claim graded against hidden truth."""

    claim: str = ""
    mass_estimate_gev: Optional[float] = None
    mass_uncertainty_gev: Optional[float] = None
    width_estimate_gev: Optional[float] = None
    significance_sigma: Optional[float] = None
    decay_channel: Optional[str] = None
    spin_hypothesis: Optional[int] = None  # 0, 1, 2
    parity: Optional[str] = None  # "+", "-"
    cross_section_fb: Optional[float] = None
    confidence: float = Field(0.5, ge=0.0, le=1.0)
    evidence_steps: List[int] = Field(default_factory=list)


class CollisionObservation(Observation):
    """Full observable state returned to the agent each step.

    Excludes the hidden particle truth and hidden detector systematics.
    """

    task: TaskSpec = Field(default_factory=TaskSpec)
    step_index: int = 0
    pipeline_history: List[PipelineStepRecord] = Field(default_factory=list)
    available_channels: List[str] = Field(default_factory=list)
    available_triggers: List[str] = Field(default_factory=list)
    available_tools: List[str] = Field(default_factory=list)
    resource_usage: ResourceUsage = Field(default_factory=ResourceUsage)
    latest_output: Optional[IntermediateOutput] = None
    all_outputs: List[IntermediateOutput] = Field(default_factory=list)
    candidate_masses_gev: List[float] = Field(default_factory=list)
    candidate_significances: List[float] = Field(default_factory=list)
    selected_channel: Optional[str] = None
    selected_beam_energy: Optional[str] = None
    cumulative_significance: float = 0.0
    uncertainty_summary: Dict[str, float] = Field(default_factory=dict)
    rule_violations: List[str] = Field(default_factory=list)
    step_reward_breakdown: Dict[str, float] = Field(default_factory=dict)


# ── Agent-facing prompt helpers ───────────────────────────────────────────


AGENT_ACTION_GUIDANCE: Dict[ActionType, str] = {
    ActionType.CONFIGURE_BEAM: (
        "Pick the LHC center-of-mass energy. Higher energy reaches heavier "
        "resonances but costs more per fb^-1. Required before collecting data."
    ),
    ActionType.ALLOCATE_LUMINOSITY: (
        "Schedule a chunk of integrated luminosity (fb^-1). More luminosity "
        "means more events but uses budget and time. Required before collecting."
    ),
    ActionType.SET_TRIGGER: (
        "Choose a hardware/HLT trigger. Match the trigger to the channel of "
        "interest; mismatched triggers throw away signal."
    ),
    ActionType.COLLECT_COLLISIONS: (
        "Run the experiment. Returns a noisy raw event count plus background "
        "estimate, conditioned on beam, luminosity, trigger, and channel."
    ),
    ActionType.CALIBRATE_DETECTOR: (
        "Apply ECAL/tracker calibration. Reduces systematic uncertainty; "
        "neglecting it inflates fit uncertainty later."
    ),
    ActionType.RECONSTRUCT_TRACKS: (
        "Reconstruct charged-particle tracks and physics objects. Required "
        "before any analysis-level step."
    ),
    ActionType.SELECT_CHANNEL: (
        "Pick the decay channel to study (γγ, ℓℓ, jj, 4ℓ, bb). Wrong channel "
        "= small signal acceptance regardless of luminosity."
    ),
    ActionType.BUILD_INVARIANT_MASS: (
        "Construct the invariant-mass histogram in the chosen channel and "
        "mass window."
    ),
    ActionType.SUBTRACT_BACKGROUND: (
        "Fit a smooth background model and subtract it to expose any peak."
    ),
    ActionType.FIT_RESONANCE: (
        "Fit a Breit-Wigner / Crystal Ball line shape. Returns mass, width, "
        "and statistical uncertainty."
    ),
    ActionType.SCAN_BUMP: (
        "Run a sliding-window bump hunt over the mass window. Reports the "
        "most-significant candidate region."
    ),
    ActionType.MEASURE_ANGULAR: (
        "Measure decay angular distribution to constrain spin/parity. "
        "Useful only after a peak is identified."
    ),
    ActionType.ESTIMATE_SIGNIFICANCE: (
        "Compute the statistical significance of a candidate signal in σ. "
        "Required before claiming a discovery."
    ),
    ActionType.REQUEST_SYSTEMATICS: (
        "Run a systematics study (JES, luminosity, calibration). Improves "
        "uncertainty estimates and reduces overconfidence penalty."
    ),
    ActionType.REQUEST_THEORY_REVIEW: (
        "Ask a theorist sub-agent to review the evidence; small extra signal "
        "but not a substitute for missing data."
    ),
    ActionType.SUBMIT_DISCOVERY_CLAIM: (
        "Submit a structured discovery claim. Graded on mass calibration, "
        "significance, channel, spin hypothesis, and overconfidence."
    ),
}


AGENT_ENVIRONMENT_RULES: List[str] = [
    "Each successful action returns summarized evidence; do not repeat steps.",
    "Hard prerequisites are enforced: data collection requires beam+luminosity+trigger; "
    "analysis requires reconstruction and a chosen channel.",
    "A discovery claim requires a fitted resonance and an estimated significance.",
    "Tools listed in available_tools are pre-filtered for this episode; prefer them.",
    "Submitting an overconfident wrong claim is heavily penalised.",
]


def build_agent_system_prompt() -> str:
    lines = [
        "You are an expert high-energy physicist running an analysis at the LHC.",
        "",
        "At each turn you observe the experiment state and pick one structured next step",
        "to maximise the probability of correctly characterising a hidden resonance.",
        "",
        "Environment rules:",
    ]
    lines.extend(f"  - {rule}" for rule in AGENT_ENVIRONMENT_RULES)
    lines.append("")
    lines.append("Action guidance:")
    lines.extend(
        f"  - {a.value}: {AGENT_ACTION_GUIDANCE[a]}" for a in ActionType
    )
    lines.extend([
        "",
        "Respond with ONLY a single valid JSON object, no extra prose:",
        '{"action_type": "...", "method": null, "parameters": {}, "justification": "...", "confidence": 0.8}',
        "",
        "For submit_discovery_claim, structure parameters['claim'] as:",
        '{"mass_estimate_gev": 125.0, "mass_uncertainty_gev": 0.5, "width_estimate_gev": 0.004,'
        ' "significance_sigma": 5.2, "decay_channel": "diphoton", "spin_hypothesis": 0,'
        ' "parity": "+", "cross_section_fb": 50.0, "confidence": 0.9}',
    ])
    return "\n".join(lines)


def build_agent_observation_context(
    obs: CollisionObservation,
    *,
    max_tools: int = 6,
    max_channels: int = 4,
) -> str:
    parts: List[str] = []

    parts.append(
        f"Mass search window: [{obs.task.mass_search_window_gev[0]:.0f}, "
        f"{obs.task.mass_search_window_gev[1]:.0f}] GeV; "
        f"difficulty={obs.task.difficulty}."
    )

    chans = list(dict.fromkeys(obs.available_channels or obs.task.available_channels))
    if chans:
        parts.append("Available channels: " + ", ".join(chans[:max_channels]))

    tools = list(dict.fromkeys(obs.available_tools or obs.task.available_tools))
    if tools:
        parts.append("Available tools: " + ", ".join(tools[:max_tools]))

    if obs.selected_channel:
        parts.append(f"Selected channel: {obs.selected_channel}")
    if obs.selected_beam_energy:
        parts.append(f"Beam energy: {obs.selected_beam_energy}")

    if obs.candidate_masses_gev:
        masses = [f"{m:.1f}" for m in obs.candidate_masses_gev[:3]]
        sigmas = [f"{s:.1f}" for s in obs.candidate_significances[:3]]
        parts.append(
            "Candidate peaks (GeV / σ): "
            + ", ".join(f"{m}/{s}" for m, s in zip(masses, sigmas))
        )

    return "\n".join(parts)


__all__ = [
    "ActionType",
    "DAQ_ACTIONS",
    "RECO_ACTIONS",
    "ANALYSIS_ACTIONS",
    "META_ACTIONS",
    "DetectorChannel",
    "TriggerType",
    "BeamEnergy",
    "ToolCategory",
    "ToolSpec",
    "TOOL_REGISTRY",
    "ExperimentAction",
    "OutputType",
    "IntermediateOutput",
    "ResourceUsage",
    "PipelineStepRecord",
    "PaperReference",
    "ExpectedFinding",
    "TaskSpec",
    "DiscoveryClaim",
    "CollisionObservation",
    "AGENT_ACTION_GUIDANCE",
    "AGENT_ENVIRONMENT_RULES",
    "build_agent_system_prompt",
    "build_agent_observation_context",
]