from datetime import datetime

import sqlalchemy as sa
from sqlalchemy import Column, DateTime, Float, ForeignKey, Integer, JSON, String, Text
from sqlalchemy.dialects.mysql import LONGTEXT
from sqlalchemy.orm import relationship

from app.models.base import Base, TimestampMixin


class ToolJob(Base, TimestampMixin):
    __tablename__ = "tool_jobs"

    id = Column(Integer, primary_key=True, index=True)
    user_id = Column(Integer, ForeignKey("users.id"), nullable=False, index=True)
    tool_name = Column(String(128), nullable=False, index=True)
    status = Column(String(32), nullable=False, default="pending")
    input_file_name = Column(String(255), nullable=False)
    input_file_path = Column(String(512), nullable=False)
    error_message = Column(Text, nullable=True)
    started_at = Column(DateTime, nullable=True)
    completed_at = Column(DateTime, nullable=True)
    output_summary = Column(JSON, nullable=True)

    user = relationship("User")
    srs_extraction = relationship(
        "SRSExtraction",
        back_populates="job",
        uselist=False,
        cascade="all, delete-orphan",
    )
    testing_generation = relationship(
        "TestingGeneration",
        back_populates="job",
        uselist=False,
        cascade="all, delete-orphan",
        foreign_keys="TestingGeneration.job_id",
    )


class SRSExtraction(Base, TimestampMixin):
    __tablename__ = "srs_extractions"

    id = Column(Integer, primary_key=True, index=True)
    job_id = Column(Integer, ForeignKey("tool_jobs.id", ondelete="CASCADE"), nullable=False, unique=True)
    document_name = Column(String(255), nullable=False)
    document_title = Column(String(255), nullable=False)
    generated_at = Column(DateTime, default=datetime.utcnow, nullable=False)
    total_requirements = Column(Integer, nullable=False, default=0)
    statistics = Column(JSON, nullable=True)
    raw_output = Column(JSON, nullable=True)

    job = relationship("ToolJob", back_populates="srs_extraction")
    requirements = relationship(
        "SRSRequirement",
        back_populates="extraction",
        cascade="all, delete-orphan",
        order_by="SRSRequirement.sort_order",
    )


class SRSRequirement(Base, TimestampMixin):
    __tablename__ = "srs_requirements"

    id = Column(Integer, primary_key=True, index=True)
    extraction_id = Column(Integer, ForeignKey("srs_extractions.id", ondelete="CASCADE"), nullable=False)
    requirement_uid = Column(String(64), nullable=False)
    title = Column(String(255), nullable=False)
    description = Column(LONGTEXT, nullable=False)
    priority = Column(String(16), nullable=False, default="中")
    acceptance_criteria = Column(JSON, nullable=False)
    source_field = Column(String(255), nullable=False)
    section_uid = Column(String(64), nullable=True)
    section_number = Column(String(64), nullable=True)
    section_title = Column(String(255), nullable=True)
    requirement_type = Column(String(64), nullable=True)
    interface_name = Column(String(255), nullable=True)
    interface_type = Column(String(128), nullable=True)
    data_source = Column(String(255), nullable=True)
    data_destination = Column(String(255), nullable=True)
    sort_order = Column(Integer, nullable=False, default=0)

    extraction = relationship("SRSExtraction", back_populates="requirements")

    __table_args__ = (
        sa.UniqueConstraint("extraction_id", "requirement_uid", name="uq_srs_extraction_requirement_uid"),
        sa.Index("idx_srs_requirements_extraction_sort", "extraction_id", "sort_order"),
    )


class TestingGeneration(Base, TimestampMixin):
    __tablename__ = "testing_generations"

    id = Column(Integer, primary_key=True, index=True)
    job_id = Column(Integer, ForeignKey("tool_jobs.id", ondelete="CASCADE"), nullable=False, unique=True)
    source_job_id = Column(Integer, ForeignKey("tool_jobs.id"), nullable=True, index=True)
    source_document_name = Column(String(255), nullable=False)
    generated_at = Column(DateTime, default=datetime.utcnow, nullable=False)
    total_requirements = Column(Integer, nullable=False, default=0)
    knowledge_base_id = Column(Integer, ForeignKey("knowledge_bases.id"), nullable=True, index=True)
    generated_file = Column(JSON, nullable=False)

    job = relationship("ToolJob", back_populates="testing_generation", foreign_keys=[job_id])


class CodeKnowledgeBase(Base, TimestampMixin):
    __tablename__ = "code_knowledge_bases"

    id = Column(Integer, primary_key=True, index=True)
    user_id = Column(Integer, ForeignKey("users.id"), nullable=False, index=True)
    name = Column(String(255), nullable=False)
    project_path = Column(String(1024), nullable=True)
    vector_path = Column(String(1024), nullable=False)
    metadata_path = Column(String(1024), nullable=False)
    graph_path = Column(String(1024), nullable=False)
    status = Column(String(32), nullable=False, default="active", index=True)
    metadata_summary = Column(JSON, nullable=True)

    user = relationship("User")
    consistency_jobs = relationship(
        "ConsistencyJob",
        back_populates="code_kb",
        cascade="all, delete-orphan",
    )


class ConsistencyJob(Base, TimestampMixin):
    __tablename__ = "consistency_jobs"

    id = Column(Integer, primary_key=True, index=True)
    user_id = Column(Integer, ForeignKey("users.id"), nullable=False, index=True)
    srs_extraction_id = Column(Integer, ForeignKey("srs_extractions.id"), nullable=False, index=True)
    code_kb_id = Column(Integer, ForeignKey("code_knowledge_bases.id"), nullable=False, index=True)
    status = Column(String(32), nullable=False, default="pending", index=True)
    total_requirements = Column(Integer, nullable=False, default=0)
    completed_requirements = Column(Integer, nullable=False, default=0)
    output_summary = Column(JSON, nullable=True)
    error_message = Column(Text, nullable=True)
    started_at = Column(DateTime, nullable=True)
    completed_at = Column(DateTime, nullable=True)

    user = relationship("User")
    srs_extraction = relationship("SRSExtraction")
    code_kb = relationship("CodeKnowledgeBase", back_populates="consistency_jobs")
    results = relationship(
        "ConsistencyResult",
        back_populates="job",
        cascade="all, delete-orphan",
        order_by="ConsistencyResult.id",
    )


class ConsistencyResult(Base, TimestampMixin):
    __tablename__ = "consistency_results"

    id = Column(Integer, primary_key=True, index=True)
    job_id = Column(Integer, ForeignKey("consistency_jobs.id", ondelete="CASCADE"), nullable=False, index=True)
    requirement_uid = Column(String(64), nullable=False, index=True)
    verdict = Column(String(32), nullable=False, index=True)
    coverage_score = Column(Float, nullable=False, default=0.0)
    confidence = Column(Float, nullable=False, default=0.0)
    matched_functions = Column(JSON, nullable=False)
    covered_points = Column(JSON, nullable=False)
    missing_points = Column(JSON, nullable=False)
    conflict_points = Column(JSON, nullable=False)
    call_chain_evidence = Column(JSON, nullable=False)
    suggestion = Column(Text, nullable=True)
    raw_judgment = Column(JSON, nullable=True)

    job = relationship("ConsistencyJob", back_populates="results")