from datetime import datetime
from pydantic import BaseModel, Field

from .models import CodeLanguage, NodeType, Priority, Status, TestStatus


# ─── Requirement ─────────────────────────────────────────────────────────
class RequirementCreate(BaseModel):
    id: str = Field(..., max_length=64)
    title: str = Field(..., max_length=256)
    description: str | None = None
    priority: Priority = Priority.medium
    phase: int | None = None
    status: Status = Status.draft
    node_type: NodeType = NodeType.requirement
    parent_id: str | None = None
    sort_order: int = 0
    project_id: int | None = None
    gitea_issue_number: int | None = None
    gitea_repo: str | None = None
    acceptance_criteria: str | None = None
    test_spec: str | None = None
    test_code: str | None = None
    impl_code: str | None = None
    code_language: CodeLanguage | None = None
    target_test_file: str | None = None
    target_impl_file: str | None = None


class RequirementUpdate(BaseModel):
    title: str | None = None
    description: str | None = None
    priority: Priority | None = None
    phase: int | None = None
    status: Status | None = None
    node_type: NodeType | None = None
    parent_id: str | None = None
    sort_order: int | None = None
    gitea_issue_number: int | None = None
    gitea_repo: str | None = None
    acceptance_criteria: str | None = None
    test_spec: str | None = None
    test_code: str | None = None
    impl_code: str | None = None
    code_language: CodeLanguage | None = None
    target_test_file: str | None = None
    target_impl_file: str | None = None
    measurable: bool | None = None
    consistent: bool | None = None
    single_purpose: bool | None = None


class QualityReport(BaseModel):
    traceable: bool
    measurable: bool
    consistent: bool
    single_purpose: bool
    errors: list[str]
    warnings: list[str]
    valid: bool


class RequirementResponse(BaseModel):
    id: str
    title: str
    description: str | None
    priority: Priority
    phase: int | None
    status: Status
    node_type: NodeType
    parent_id: str | None
    sort_order: int
    project_id: int | None
    gitea_issue_number: int | None
    gitea_repo: str | None
    traceable: bool
    measurable: bool
    consistent: bool
    single_purpose: bool
    acceptance_criteria: str | None
    test_spec: str | None
    test_code: str | None
    impl_code: str | None
    code_language: CodeLanguage | None
    target_test_file: str | None
    target_impl_file: str | None
    test_status: TestStatus
    created_at: datetime
    updated_at: datetime
    quality: QualityReport | None = None
    children: list["RequirementResponse"] = []

    model_config = {"from_attributes": True}


class RequirementTreeNode(BaseModel):
    id: str
    title: str
    priority: Priority
    phase: int | None
    status: Status
    node_type: NodeType
    parent_id: str | None
    child_count: int = 0
    traceable: bool
    measurable: bool
    consistent: bool
    single_purpose: bool
    gitea_issue_number: int | None = None
    children: list["RequirementTreeNode"] = []

    model_config = {"from_attributes": True}


# ─── Requirement History ────────────────────────────────────────────────
class RequirementHistorySummary(BaseModel):
    id: int
    requirement_id: str
    version: int
    title: str
    status: str
    created_at: datetime
    change_summary: str | None

    model_config = {"from_attributes": True}


class RequirementHistoryDetail(RequirementHistorySummary):
    description: str | None
    priority: str
    phase: int | None
    node_type: str
    acceptance_criteria: str | None
    test_spec: str | None
    test_code: str | None
    impl_code: str | None
    code_language: str | None
    target_test_file: str | None
    target_impl_file: str | None
    measurable: bool
    consistent: bool
    single_purpose: bool
    gitea_issue_number: int | None
    gitea_repo: str | None


# ─── Graph Layouts ──────────────────────────────────────────────────────
class GraphLayoutCreate(BaseModel):
    name: str = Field(..., max_length=128)
    description: str | None = None
    project_id: int | None = None
    node_positions: dict[str, dict[str, float]]
    viewport: dict[str, object]
    is_default: bool = False


class GraphLayoutUpdate(BaseModel):
    name: str | None = None
    description: str | None = None
    node_positions: dict[str, dict[str, float]] | None = None
    viewport: dict[str, object] | None = None
    is_default: bool | None = None


class GraphLayoutResponse(BaseModel):
    id: int
    name: str
    description: str | None
    project_id: int | None
    is_default: bool
    created_at: datetime
    updated_at: datetime

    model_config = {"from_attributes": True}


class GraphLayoutDetailResponse(GraphLayoutResponse):
    node_positions: dict[str, dict[str, float]]
    viewport: dict[str, object]


# ─── Cross-Pillar Links ─────────────────────────────────────────────────
class LinkCreate(BaseModel):
    source_id: str
    target_id: str
    relationship_type: str = "shared_parent"


class LinkResponse(BaseModel):
    source_id: str
    target_id: str
    relationship_type: str

    model_config = {"from_attributes": True}


# ─── Project ────────────────────────────────────────────────────────────
class ProjectCreate(BaseModel):
    name: str = Field(..., max_length=256)
    description: str | None = None
    repo_path: str | None = None
    repo_url: str | None = None
    requirements_yaml_path: str | None = None


class ProjectResponse(BaseModel):
    id: int
    name: str
    description: str | None
    repo_path: str | None
    repo_url: str | None
    requirements_yaml_path: str | None
    created_at: datetime

    model_config = {"from_attributes": True}


# ─── Stats ───────────────────────────────────────────────────────────────
class StatsResponse(BaseModel):
    total_nodes: int
    pillars: int
    requirements: int
    sub_requirements: int
    leaves: int
    by_status: dict[str, int]
    by_priority: dict[str, int]
    quality_passing: int
    quality_failing: int
    coverage_percent: float