"""Shared models for the Python code-review OpenEnv benchmark."""

from __future__ import annotations

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

from pydantic import BaseModel, Field, model_validator
from openenv.core.env_server.types import Action, Observation, State


class Difficulty(str, Enum):
    EASY = "easy"
    MEDIUM = "medium"
    HARD = "hard"


class ActionType(str, Enum):
    ADD_COMMENT = "ADD_COMMENT"
    APPROVE = "APPROVE"
    REQUEST_CHANGES = "REQUEST_CHANGES"
    ASK_CONTEXT = "ASK_CONTEXT"
    SKIP_LINE = "SKIP_LINE"


class IssueType(str, Enum):
    STYLE = "STYLE"
    LOGIC = "LOGIC"
    SECURITY = "SECURITY"
    PERFORMANCE = "PERFORMANCE"
    DOCS = "DOCS"


class Severity(str, Enum):
    LOW = "LOW"
    MEDIUM = "MEDIUM"
    HIGH = "HIGH"
    CRITICAL = "CRITICAL"


class GoldIssue(BaseModel):
    """Hidden benchmark annotation for one issue in a snippet."""

    issue_id: str
    line: int = Field(..., ge=1)
    issue_type: IssueType
    severity: Severity
    description: str
    required: bool = True
    explanation_keywords: List[str] = Field(default_factory=list)
    fix_keywords: List[str] = Field(default_factory=list)
    owasp_category: Optional[str] = None
    owasp_keywords: List[str] = Field(default_factory=list)


class ReviewComment(BaseModel):
    """Stored review action visible to the agent in `review_history`."""

    step_index: int = Field(..., ge=1)
    action_type: ActionType
    line_number: Optional[int] = Field(default=None, ge=1)
    issue_type: Optional[IssueType] = None
    severity: Optional[Severity] = None
    comment: Optional[str] = None
    suggestion: Optional[str] = None
    question: Optional[str] = None
    matched_issue_ids: List[str] = Field(default_factory=list)
    reward_delta: float = 0.0


class CodeReviewSnippet(BaseModel):
    """Benchmark sample loaded from JSON."""

    snippet_id: str
    filename: str
    code: str
    context: Optional[str] = None
    diff: Optional[str] = None
    gold_issues: List[GoldIssue]
    must_approve: bool = False
    must_reject: bool = True


class TaskMetadata(BaseModel):
    """Visible task-family metadata."""

    task_id: str
    name: str
    difficulty: Difficulty
    description: str
    snippet_count: int = Field(..., ge=0)
    max_steps: int = Field(..., ge=1)
    min_score: float = Field(default=0.0, ge=0.0, le=1.0)
    max_score: float = Field(default=1.0, ge=0.0, le=1.0)


class ReviewFinding(BaseModel):
    """Compatibility shim for earlier template-derived environment code."""

    title: str = ""
    line: Optional[int] = Field(default=None, ge=1)
    category: str = "bug"
    severity: str = "warning"
    rationale: str = ""
    recommendation: Optional[str] = None
    rule_id: Optional[str] = None


class TaskDescriptor(BaseModel):
    """Compatibility shim for earlier template-derived environment code."""

    task_id: str
    difficulty: str
    title: str
    objective: str
    code: str
    max_steps: int = Field(..., ge=1)
    success_threshold: float = Field(default=0.0, ge=0.0, le=1.0)


class TaskEvaluation(BaseModel):
    """Compatibility shim for earlier template-derived environment code."""

    matched_reference_ids: List[str] = Field(default_factory=list)
    matched_findings: int = 0
    total_findings: int = 0
    false_positives: int = 0
    duplicate_findings: int = 0
    weighted_recall: float = 0.0
    patch_score: float = 0.0
    score: float = 0.0
    passed: bool = False


class PythonEnvConfig(BaseModel):
    """Environment configuration used by the benchmark runtime."""

    task_order: List[str] = Field(
        default_factory=lambda: ["task_easy", "task_medium", "task_hard"]
    )
    max_steps_per_task: int = Field(default=25, ge=1, le=100)
    max_history_entries: int = Field(default=200, ge=1, le=1000)
    rotate_tasks: bool = True
    
    # Evaluation parameters
    patch_bonus_multiplier: float = 0.2
    false_positive_penalty: float = 0.05
    duplicate_penalty: float = 0.02
    hint_penalty: float = 0.1


class EpisodeMetrics(BaseModel):
    """Current episode metrics for UI, evaluation, and RL logging."""

    precision: float = Field(default=0.0, ge=0.0, le=1.0)
    recall: float = Field(default=0.0, ge=0.0, le=1.0)
    f1: float = Field(default=0.0, ge=0.0, le=1.0)
    true_positives: int = Field(default=0, ge=0)
    false_positives: int = Field(default=0, ge=0)
    missed_issues: int = Field(default=0, ge=0)
    required_found: int = Field(default=0, ge=0)
    required_total: int = Field(default=0, ge=0)
    bonus_found: int = Field(default=0, ge=0)
    duplicate_comments: int = Field(default=0, ge=0)
    context_requests: int = Field(default=0, ge=0)
    skipped_clean_lines: int = Field(default=0, ge=0)
    skipped_issue_lines: int = Field(default=0, ge=0)
    current_score: float = Field(default=0.0, ge=0.0, le=1.0)
    cumulative_reward: float = 0.0
    breakdown: Dict[str, float] = Field(default_factory=dict)


class RewardSummary(BaseModel):
    """Reward details from the most recent step."""

    step_reward: float = 0.0
    cumulative_reward: float = 0.0
    breakdown: Dict[str, float] = Field(default_factory=dict)
    false_positives: int = Field(default=0, ge=0)
    true_positives: int = Field(default=0, ge=0)
    missed_issues: int = Field(default=0, ge=0)


class PythonReviewAction(Action):
    """Structured review action emitted by a model or trainer."""

    operation: str = Field(default="ADD_COMMENT", description="The operation to perform.")
    findings: List[ReviewFinding] = Field(default_factory=list, description="The findings list.")
    patched_code: Optional[str] = Field(default=None, description="The fixed source code.")
    
    action_type: ActionType = Field(
        default=ActionType.ADD_COMMENT,
        description="Choose the review action: comment on a line, skip a clean line, ask for context, approve, or request changes.",
    )
    line_number: Optional[int] = Field(
        default=None,
        ge=1,
        description="Required for ADD_COMMENT and SKIP_LINE. Enter the code line number you are acting on.",
    )
    issue_type: Optional[IssueType] = Field(
        default=None,
        description="Required for ADD_COMMENT. Pick the issue category for the selected line.",
    )
    severity: Optional[Severity] = Field(
        default=None,
        description="Required for ADD_COMMENT. Pick how serious the issue is.",
    )
    comment: Optional[str] = Field(
        default=None,
        description="Required for ADD_COMMENT. Also used for ASK_CONTEXT if you want to ask a question in plain text.",
    )
    suggestion: Optional[str] = None
    question: Optional[str] = None

    @classmethod
    def model_json_schema(cls, *args, **kwargs):
        """Trim legacy fields from the generated UI schema."""

        schema = super().model_json_schema(*args, **kwargs)
        properties = schema.get("properties", {})
        visible_fields = {
            "action_type",
            "line_number",
            "issue_type",
            "severity",
            "comment",
        }
        schema["properties"] = {
            name: value for name, value in properties.items() if name in visible_fields
        }
        schema["required"] = [
            name for name in schema.get("required", []) if name in visible_fields
        ]
        return schema

    @model_validator(mode="after")
    def validate_action_shape(self) -> "PythonReviewAction":
        """Require the right fields for each action type."""

        # Legacy template actions still use string operations like `submit_findings`.
        # Benchmark actions should validate against `action_type`.
        if self.operation != "ADD_COMMENT":
            return self

        if self.action_type == ActionType.ADD_COMMENT:
            missing = []
            if self.line_number is None:
                missing.append("line_number")
            if self.issue_type is None:
                missing.append("issue_type")
            if self.severity is None:
                missing.append("severity")
            if not (self.comment or "").strip():
                missing.append("comment")
            if missing:
                raise ValueError("ADD_COMMENT requires: " + ", ".join(missing))
        elif self.action_type == ActionType.SKIP_LINE:
            if self.line_number is None:
                raise ValueError("SKIP_LINE requires line_number")
        elif self.action_type == ActionType.ASK_CONTEXT:
            if not (self.question or self.comment or "").strip():
                raise ValueError("ASK_CONTEXT requires question or comment")
        elif self.action_type in {ActionType.APPROVE, ActionType.REQUEST_CHANGES}:
            noisy_fields = {
                "line_number": self.line_number,
                "issue_type": self.issue_type,
                "severity": self.severity,
                "comment": self.comment,
                "suggestion": self.suggestion,
                "question": self.question,
            }
            populated = [
                name for name, value in noisy_fields.items() if value not in (None, "")
            ]
            if populated:
                raise ValueError(
                    f"{self.action_type.value} does not accept extra fields: {', '.join(populated)}"
                )
        return self


class PythonReviewObservation(Observation):
    """Observation returned by reset/step, including trainer-visible metrics."""

    snippet_id: str = ""
    code: str = ""
    filename: str = ""
    language: str = "python"
    context: Optional[str] = None
    diff: Optional[str] = None
    line_count: int = Field(default=0, ge=0)
    current_step: int = Field(default=0, ge=0)
    max_steps: int = Field(default=1, ge=1)
    task_id: str = ""
    review_history: List[ReviewComment] = Field(default_factory=list)
    lines: List[str] = Field(default_factory=list)
    reward_summary: RewardSummary = Field(default_factory=RewardSummary)
    metrics: EpisodeMetrics = Field(default_factory=EpisodeMetrics)
    feedback: str = ""
    review_time_ms: float = 0.0
    
    # Template compatibility
    task: Optional[TaskDescriptor] = None
    instructions: str = ""
    submitted_findings: List[ReviewFinding] = Field(default_factory=list)
    hints_used: int = 0
    attempts_remaining: int = 0
    evaluation: Optional[TaskEvaluation] = None
    score: float = 0.0


class PythonReviewState(State):
    """Full server-side state exposed by `/state`."""

    task_id: Optional[str] = None
    difficulty: Optional[Difficulty] = None
    snippet_id: Optional[str] = None
    current_step: int = Field(default=0, ge=0)
    max_steps: int = Field(default=0, ge=0)
    done: bool = False
    filename: Optional[str] = None
    review_history: List[ReviewComment] = Field(default_factory=list)
    metrics: EpisodeMetrics = Field(default_factory=EpisodeMetrics)
    last_feedback: str = ""


class TaskListResponse(BaseModel):
    tasks: List[TaskMetadata] = Field(default_factory=list)


class MetricsResponse(BaseModel):
    task_id: Optional[str] = None
    snippet_id: Optional[str] = None
    done: bool = False
    metrics: EpisodeMetrics = Field(default_factory=EpisodeMetrics)


class HealthResponse(BaseModel):
    status: str = "ok"
    environment: str = "python_code_review_env"
    task_count: int = Field(default=0, ge=0)
    active_task_id: Optional[str] = None
    active_snippet_id: Optional[str] = None
    active_episode_id: Optional[str] = None


PythonAction = PythonReviewAction
PythonObservation = PythonReviewObservation
PythonState = PythonReviewState
CodeReviewAction = PythonReviewAction
CodeReviewObservation = PythonReviewObservation
CodeReviewConfig = PythonEnvConfig