from __future__ import annotations

from django.db import models

from control_plane.common import TimestampedModel


class TradingProjectStatus(models.TextChoices):
    ARCHAEOLOGY = "ARCHAEOLOGY"
    DATA_VALIDATION = "DATA_VALIDATION"
    BACKTEST_AUDIT = "BACKTEST_AUDIT"
    OFFLINE_ONLY = "OFFLINE_ONLY"
    SHADOW_READY = "SHADOW_READY"
    PAUSED = "PAUSED"


class DataKind(models.TextChoices):
    OHLCV = "OHLCV"
    TRADES = "TRADES"
    TICKS = "TICKS"
    ORDER_BOOK = "ORDER_BOOK"
    FUNDING = "FUNDING"
    OPEN_INTEREST = "OPEN_INTEREST"
    LIQUIDATIONS = "LIQUIDATIONS"
    MARK_PRICE = "MARK_PRICE"
    INDEX_PRICE = "INDEX_PRICE"
    FILL_HISTORY = "FILL_HISTORY"
    OTHER = "OTHER"


class EvidenceStatus(models.TextChoices):
    CONFIRMED = "CONFIRMED"
    INFERRED = "INFERRED"
    UNKNOWN = "UNKNOWN"
    SAFE = "SAFE"
    SUSPICIOUS = "SUSPICIOUS"
    BLOCKED = "BLOCKED"


class SplitKind(models.TextChoices):
    DISCOVERY = "DISCOVERY"
    TRAIN = "TRAIN"
    VALIDATION = "VALIDATION"
    HOLDOUT = "HOLDOUT"
    FORWARD = "FORWARD"
    LIVE = "LIVE"


class StrategyStage(models.TextChoices):
    HYPOTHESIS = "HYPOTHESIS"
    BACKTEST = "BACKTEST"
    WALK_FORWARD = "WALK_FORWARD"
    ROBUSTNESS = "ROBUSTNESS"
    HOLDOUT = "HOLDOUT"
    SHADOW = "SHADOW"
    MICRO_LIVE = "MICRO_LIVE"
    PROVEN = "PROVEN"
    CHAMPION = "CHAMPION"
    KILLED = "KILLED"


class ExperimentStatus(models.TextChoices):
    PROPOSED = "PROPOSED"
    RUNNING = "RUNNING"
    SUCCEEDED = "SUCCEEDED"
    REJECTED = "REJECTED"
    FAILED = "FAILED"


class RunStatus(models.TextChoices):
    QUEUED = "QUEUED"
    RUNNING = "RUNNING"
    SUCCEEDED = "SUCCEEDED"
    FAILED = "FAILED"
    INVALID = "INVALID"


class Decision(models.TextChoices):
    KILL = "KILL"
    REVISE = "REVISE"
    ADVANCE = "ADVANCE"
    PROMOTE = "PROMOTE"
    DEMOTE = "DEMOTE"
    REQUIRE_MORE_EVIDENCE = "REQUIRE_MORE_EVIDENCE"


class FailureType(models.TextChoices):
    NO_ALPHA = "NO_ALPHA"
    OVERFIT = "OVERFIT"
    LEAKAGE = "LEAKAGE"
    FEE_DESTROYED = "FEE_DESTROYED"
    SLIPPAGE_DESTROYED = "SLIPPAGE_DESTROYED"
    LATENCY_DESTROYED = "LATENCY_DESTROYED"
    REGIME_FRAGILE = "REGIME_FRAGILE"
    PARAMETER_FRAGILE = "PARAMETER_FRAGILE"
    INSUFFICIENT_TRADES = "INSUFFICIENT_TRADES"
    RISK_TOO_HIGH = "RISK_TOO_HIGH"
    TAIL_RISK = "TAIL_RISK"
    EXECUTION_FAILURE = "EXECUTION_FAILURE"
    DATA_FAILURE = "DATA_FAILURE"
    LIVE_DIVERGENCE = "LIVE_DIVERGENCE"
    CAPACITY_LIMIT = "CAPACITY_LIMIT"
    UNKNOWN = "UNKNOWN"


class AllocationTier(models.TextChoices):
    RESEARCH = "RESEARCH"
    SHADOW = "SHADOW"
    MICRO = "MICRO"
    VALIDATED = "VALIDATED"
    PROVEN = "PROVEN"
    CHAMPION = "CHAMPION"


class TradingProject(TimestampedModel):
    project = models.ForeignKey("projects.Project", on_delete=models.PROTECT, related_name="trading_projects")
    name = models.CharField(max_length=200)
    slug = models.SlugField(max_length=120, unique=True)
    goal = models.TextField()
    repository_path = models.TextField(blank=True)
    working_directory = models.TextField(blank=True)
    profile_name = models.CharField(max_length=120, default="crypto_hyperliquid")
    existing_system_profile = models.CharField(max_length=120, default="hyperscalper")
    status = models.CharField(max_length=32, choices=TradingProjectStatus.choices, default=TradingProjectStatus.ARCHAEOLOGY)
    current_champion = models.ForeignKey("StrategyVersion", on_delete=models.SET_NULL, null=True, blank=True, related_name="champion_for_projects")
    metadata = models.JSONField(default=dict, blank=True)


class MarketDataset(TimestampedModel):
    trading_project = models.ForeignKey(TradingProject, on_delete=models.CASCADE, related_name="market_datasets")
    name = models.CharField(max_length=200)
    kind = models.CharField(max_length=32, choices=DataKind.choices)
    venue = models.CharField(max_length=120, blank=True)
    symbol = models.CharField(max_length=120, blank=True)
    market_type = models.CharField(max_length=80, blank=True)
    metadata = models.JSONField(default=dict, blank=True)

    class Meta:
        constraints = [models.UniqueConstraint(fields=["trading_project", "name"], name="unique_trading_market_dataset")]


class MarketDatasetVersion(TimestampedModel):
    dataset = models.ForeignKey(MarketDataset, on_delete=models.CASCADE, related_name="versions")
    version = models.CharField(max_length=120)
    reference = models.TextField()
    content_hash = models.CharField(max_length=128)
    processing_version = models.CharField(max_length=120, blank=True)
    start_at = models.DateTimeField(null=True, blank=True)
    end_at = models.DateTimeField(null=True, blank=True)
    resolution = models.CharField(max_length=80, blank=True)
    record_count = models.BigIntegerField(null=True, blank=True)
    fields = models.JSONField(default=list, blank=True)
    quality = models.JSONField(default=dict, blank=True)
    lookahead_risk_status = models.CharField(max_length=16, choices=EvidenceStatus.choices, default=EvidenceStatus.UNKNOWN)
    quality_status = models.CharField(max_length=16, choices=EvidenceStatus.choices, default=EvidenceStatus.UNKNOWN)
    temporal_splits = models.JSONField(default=dict, blank=True)
    immutable = models.BooleanField(default=False)

    class Meta:
        constraints = [models.UniqueConstraint(fields=["dataset", "version"], name="unique_trading_market_dataset_version")]

    def save(self, *args, **kwargs):
        if self.pk and self.immutable:
            original = type(self).objects.get(pk=self.pk)
            fields = ["version", "reference", "content_hash", "processing_version", "start_at", "end_at", "resolution", "record_count", "fields", "quality", "lookahead_risk_status", "temporal_splits"]
            if any(getattr(self, field) != getattr(original, field) for field in fields):
                raise ValueError("MarketDatasetVersion is immutable after research use.")
        super().save(*args, **kwargs)


class FeatureDefinition(TimestampedModel):
    trading_project = models.ForeignKey(TradingProject, on_delete=models.CASCADE, related_name="features")
    name = models.CharField(max_length=160)
    family = models.CharField(max_length=120, blank=True)
    implementation_reference = models.TextField()
    code_hash = models.CharField(max_length=128, blank=True)
    lookback = models.JSONField(default=dict, blank=True)
    dependencies = models.JSONField(default=list, blank=True)
    normalization = models.JSONField(default=dict, blank=True)
    timeframe = models.CharField(max_length=80, blank=True)
    leakage_status = models.CharField(max_length=16, choices=EvidenceStatus.choices, default=EvidenceStatus.UNKNOWN)
    evidence = models.JSONField(default=dict, blank=True)

    class Meta:
        constraints = [models.UniqueConstraint(fields=["trading_project", "name", "code_hash"], name="unique_trading_feature_definition")]


class FeatureSetVersion(TimestampedModel):
    trading_project = models.ForeignKey(TradingProject, on_delete=models.CASCADE, related_name="feature_sets")
    name = models.CharField(max_length=160)
    version = models.CharField(max_length=120)
    feature_definitions = models.ManyToManyField(FeatureDefinition, related_name="feature_sets")
    content_hash = models.CharField(max_length=128)
    immutable = models.BooleanField(default=False)

    class Meta:
        constraints = [models.UniqueConstraint(fields=["trading_project", "name", "version"], name="unique_trading_feature_set_version")]


class Strategy(TimestampedModel):
    trading_project = models.ForeignKey(TradingProject, on_delete=models.CASCADE, related_name="strategies")
    name = models.CharField(max_length=200)
    strategy_class = models.CharField(max_length=80, blank=True)
    description = models.TextField(blank=True)
    metadata = models.JSONField(default=dict, blank=True)


class StrategyVersion(TimestampedModel):
    strategy = models.ForeignKey(Strategy, on_delete=models.CASCADE, related_name="versions")
    version = models.CharField(max_length=120)
    parent_version = models.ForeignKey("self", on_delete=models.SET_NULL, null=True, blank=True, related_name="children")
    feature_set = models.ForeignKey(FeatureSetVersion, on_delete=models.PROTECT, null=True, blank=True, related_name="strategy_versions")
    genome = models.JSONField(default=dict)
    fingerprint = models.CharField(max_length=128)
    code_reference = models.TextField(blank=True)
    stage = models.CharField(max_length=32, choices=StrategyStage.choices, default=StrategyStage.HYPOTHESIS)
    holdout_exposure_count = models.PositiveIntegerField(default=0)
    immutable = models.BooleanField(default=False)

    class Meta:
        constraints = [models.UniqueConstraint(fields=["strategy", "version"], name="unique_trading_strategy_version"), models.UniqueConstraint(fields=["strategy", "fingerprint"], name="unique_trading_strategy_fingerprint")]

    def save(self, *args, **kwargs):
        if self.pk and self.immutable:
            original = type(self).objects.get(pk=self.pk)
            if any(getattr(self, field) != getattr(original, field) for field in ["version", "parent_version_id", "feature_set_id", "genome", "fingerprint", "code_reference"]):
                raise ValueError("Live or evaluated StrategyVersion is immutable; create a child version.")
        super().save(*args, **kwargs)


class TradingCohort(TimestampedModel):
    trading_project = models.ForeignKey(TradingProject, on_delete=models.CASCADE, related_name="cohorts")
    name = models.CharField(max_length=200)
    status = models.CharField(max_length=32, choices=StrategyStage.choices, default=StrategyStage.HYPOTHESIS)
    policy_snapshot = models.JSONField(default=dict)
    dataset_version = models.ForeignKey(MarketDatasetVersion, on_delete=models.PROTECT, related_name="cohorts")
    report = models.ForeignKey("TradingResearchReport", on_delete=models.SET_NULL, null=True, blank=True, related_name="cohorts")


class CohortMembership(TimestampedModel):
    """An ordered, immutable strategy membership imported from a frozen cohort spec."""

    cohort = models.ForeignKey(TradingCohort, on_delete=models.CASCADE, related_name="memberships")
    strategy_version = models.ForeignKey(StrategyVersion, on_delete=models.PROTECT, related_name="cohort_memberships")
    ordinal = models.PositiveIntegerField()
    member_id = models.UUIDField(unique=True)
    provenance = models.CharField(max_length=80)
    metadata = models.JSONField(default=dict)

    class Meta:
        constraints = [models.UniqueConstraint(fields=["cohort", "ordinal"], name="unique_cohort_member_ordinal")]

    def save(self, *args, **kwargs):
        if self.pk and type(self).objects.filter(pk=self.pk).exists():
            original = type(self).objects.get(pk=self.pk)
            fields = ["cohort_id", "strategy_version_id", "ordinal", "member_id", "provenance", "metadata"]
            if any(getattr(self, field) != getattr(original, field) for field in fields):
                raise ValueError("CohortMembership is immutable after frozen-spec materialization.")
        super().save(*args, **kwargs)


class StrategyExperiment(TimestampedModel):
    cohort = models.ForeignKey(TradingCohort, on_delete=models.CASCADE, related_name="experiments")
    strategy_version = models.ForeignKey(StrategyVersion, on_delete=models.PROTECT, related_name="experiments")
    hypothesis = models.TextField()
    market_rationale = models.TextField()
    expected_regime = models.JSONField(default=dict)
    controls = models.JSONField(default=dict)
    success_criteria = models.JSONField(default=dict)
    rejection_criteria = models.JSONField(default=dict)
    risk_assumptions = models.JSONField(default=dict)
    execution_assumptions = models.JSONField(default=dict)
    estimated_evaluation_cost = models.JSONField(default=dict)
    status = models.CharField(max_length=32, choices=ExperimentStatus.choices, default=ExperimentStatus.PROPOSED)
    conclusion = models.CharField(max_length=32, choices=Decision.choices, blank=True)
    failure_type = models.CharField(max_length=32, choices=FailureType.choices, blank=True)


class BacktestRun(TimestampedModel):
    experiment = models.ForeignKey(StrategyExperiment, on_delete=models.PROTECT, related_name="backtests")
    dataset_version = models.ForeignKey(MarketDatasetVersion, on_delete=models.PROTECT, related_name="backtest_runs")
    split = models.CharField(max_length=32, choices=SplitKind.choices)
    execution_model_version = models.CharField(max_length=120)
    configuration = models.JSONField(default=dict)
    status = models.CharField(max_length=16, choices=RunStatus.choices, default=RunStatus.QUEUED)
    metrics = models.JSONField(default=dict)
    artifact_reference = models.TextField(blank=True)
    failure_details = models.TextField(blank=True)


class QualificationReplayRun(TimestampedModel):
    """Persisted CANARY_ONLY qualification replay and its immutable inputs."""

    strategy_version = models.ForeignKey(StrategyVersion, on_delete=models.PROTECT, related_name="qualification_runs")
    dataset_version = models.ForeignKey(MarketDatasetVersion, on_delete=models.PROTECT, related_name="qualification_runs")
    fold = models.CharField(max_length=120)
    scenario_name = models.CharField(max_length=160)
    runner_name = models.CharField(max_length=160)
    replay_mode = models.CharField(max_length=32, default="CANARY_ONLY")
    input_hash = models.CharField(max_length=128)
    calibration = models.JSONField(default=dict)
    configuration = models.JSONField(default=dict)
    summary = models.JSONField(default=dict)

    class Meta:
        constraints = [models.UniqueConstraint(
            fields=["strategy_version", "dataset_version", "fold", "scenario_name", "runner_name", "input_hash"],
            name="unique_qualification_replay_identity",
        )]


class QualificationReplayLedger(TimestampedModel):
    """Append-only replay result. Payload preserves every directly emitted ledger field."""

    qualification_run = models.ForeignKey(QualificationReplayRun, on_delete=models.CASCADE, related_name="ledger_rows")
    sequence = models.PositiveIntegerField()
    identity = models.CharField(max_length=512)
    result = models.JSONField(default=dict)

    class Meta:
        constraints = [
            models.UniqueConstraint(fields=["qualification_run", "sequence"], name="unique_qualification_ledger_sequence"),
            models.UniqueConstraint(fields=["qualification_run", "identity"], name="unique_qualification_ledger_identity"),
        ]


class WalkForwardRun(TimestampedModel):
    experiment = models.ForeignKey(StrategyExperiment, on_delete=models.PROTECT, related_name="walk_forwards")
    dataset_version = models.ForeignKey(MarketDatasetVersion, on_delete=models.PROTECT, related_name="walk_forward_runs")
    folds = models.JSONField(default=list)
    embargo_bars = models.PositiveIntegerField(default=0)
    status = models.CharField(max_length=16, choices=RunStatus.choices, default=RunStatus.QUEUED)
    metrics = models.JSONField(default=dict)


class ShadowRun(TimestampedModel):
    strategy_version = models.ForeignKey(StrategyVersion, on_delete=models.PROTECT, related_name="shadow_runs")
    status = models.CharField(max_length=16, choices=RunStatus.choices, default=RunStatus.QUEUED)
    evidence = models.JSONField(default=dict)


class LiveStrategyRun(TimestampedModel):
    strategy_version = models.ForeignKey(StrategyVersion, on_delete=models.PROTECT, related_name="live_runs")
    status = models.CharField(max_length=16, choices=RunStatus.choices, default=RunStatus.QUEUED)
    allocated_capital = models.DecimalField(max_digits=12, decimal_places=2, default=0)
    safety_policy = models.JSONField(default=dict)
    reconciliation_status = models.CharField(max_length=32, default="NOT_STARTED")
    enabled = models.BooleanField(default=False)


class TradeRecord(TimestampedModel):
    strategy_version = models.ForeignKey(StrategyVersion, on_delete=models.PROTECT, related_name="trade_records")
    live_run = models.ForeignKey(LiveStrategyRun, on_delete=models.SET_NULL, null=True, blank=True, related_name="trades")
    source = models.CharField(max_length=32, default="IMPORTED")
    lifecycle = models.JSONField(default=dict)
    gross_pnl = models.FloatField(default=0)
    fees = models.FloatField(default=0)
    funding = models.FloatField(default=0)
    slippage = models.FloatField(default=0)
    other_execution_cost = models.FloatField(default=0)
    net_pnl = models.FloatField(default=0)


class StrategyEvaluation(TimestampedModel):
    strategy_version = models.ForeignKey(StrategyVersion, on_delete=models.PROTECT, related_name="evaluations")
    experiment = models.ForeignKey(StrategyExperiment, on_delete=models.PROTECT, related_name="evaluations")
    stage = models.CharField(max_length=32, choices=StrategyStage.choices)
    verdict = models.CharField(max_length=32, choices=Decision.choices)
    metrics = models.JSONField(default=dict)
    evidence = models.JSONField(default=dict)
    failure_type = models.CharField(max_length=32, choices=FailureType.choices, blank=True)


class StrategyPromotionDecision(TimestampedModel):
    trading_project = models.ForeignKey(TradingProject, on_delete=models.CASCADE, related_name="promotion_decisions")
    candidate = models.ForeignKey(StrategyVersion, on_delete=models.PROTECT, related_name="promotion_decisions")
    champion = models.ForeignKey(StrategyVersion, on_delete=models.SET_NULL, null=True, blank=True, related_name="challenged_by")
    decision = models.CharField(max_length=32, choices=Decision.choices)
    policy_snapshot = models.JSONField(default=dict)
    evidence = models.JSONField(default=dict)
    reason = models.TextField()


class StrategyCapitalAllocation(TimestampedModel):
    strategy_version = models.ForeignKey(StrategyVersion, on_delete=models.PROTECT, related_name="capital_allocations")
    tier = models.CharField(max_length=32, choices=AllocationTier.choices)
    amount = models.DecimalField(max_digits=12, decimal_places=2, default=0)
    active = models.BooleanField(default=False)
    policy_snapshot = models.JSONField(default=dict)


class TradingResearchReport(TimestampedModel):
    trading_project = models.ForeignKey(TradingProject, on_delete=models.CASCADE, related_name="research_reports")
    report_type = models.CharField(max_length=80)
    title = models.CharField(max_length=255)
    content = models.JSONField(default=dict)
    markdown = models.TextField(blank=True)
    evidence_status = models.CharField(max_length=16, choices=EvidenceStatus.choices, default=EvidenceStatus.UNKNOWN)