"""Agent 运行、事件、工具调用和人工确认模型。"""

import uuid

from django.conf import settings
from django.db import models
from django.db.models import Q

from common.models import TimeStampedModel, UserOwnedModel


class RunStatus(models.TextChoices):
    PENDING = "pending", "等待"
    RUNNING = "running", "运行中"
    WAITING_APPROVAL = "waiting_approval", "等待确认"
    SUCCEEDED = "succeeded", "成功"
    FAILED = "failed", "失败"
    CANCELLED = "cancelled", "已取消"


class AgentRun(UserOwnedModel):
    """一次可审计的 Agent 运行；摘要字段不得保存敏感原文。"""

    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    title = models.CharField("标题", max_length=160)
    status = models.CharField("状态", max_length=32, choices=RunStatus, default=RunStatus.PENDING)
    lock_version = models.PositiveBigIntegerField("锁版本", default=0)
    input_summary = models.JSONField("输入摘要", default=dict)
    output_summary = models.JSONField("输出摘要", null=True, blank=True)
    agent_name = models.CharField("Agent 名称", max_length=100, default="job_research")
    agent_version = models.CharField("Agent 版本", max_length=40, blank=True)
    instruction_version = models.CharField("指令版本", max_length=40, blank=True)
    toolset_version = models.CharField("工具集版本", max_length=40, blank=True)
    model_name = models.CharField("模型名称", max_length=100, blank=True)
    trace_id = models.CharField("追踪标识", max_length=128, blank=True)
    started_at = models.DateTimeField("开始时间", null=True, blank=True)
    finished_at = models.DateTimeField("结束时间", null=True, blank=True)
    duration_ms = models.PositiveBigIntegerField("耗时毫秒", null=True, blank=True)
    input_tokens = models.PositiveBigIntegerField("输入 Token", null=True, blank=True)
    output_tokens = models.PositiveBigIntegerField("输出 Token", null=True, blank=True)
    estimated_cost = models.DecimalField("估算费用", max_digits=12, decimal_places=6, null=True, blank=True)
    error_code = models.CharField("错误码", max_length=80, blank=True)
    error_summary = models.TextField("错误摘要", blank=True)

    class Meta:
        ordering = ("-created_at",)
        indexes = [models.Index(fields=("owner", "created_at"), name="run_owner_created_idx")]
        constraints = [models.CheckConstraint(condition=Q(lock_version__gte=0), name="run_lock_nonnegative")]

    def __str__(self):
        return self.title


class AgentRunEvent(models.Model):
    """按序追加的不可变运行事件。"""

    run = models.ForeignKey(AgentRun, on_delete=models.PROTECT, related_name="events")
    sequence = models.PositiveBigIntegerField("事件序号")
    event_type = models.CharField("事件类型", max_length=64)
    summary = models.CharField("摘要", max_length=240)
    payload_summary = models.JSONField("数据摘要", default=dict)
    occurred_at = models.DateTimeField("发生时间")
    created_at = models.DateTimeField("记录时间", auto_now_add=True)

    class Meta:
        ordering = ("sequence",)
        constraints = [models.UniqueConstraint(fields=("run", "sequence"), name="event_run_sequence_uniq")]


class ToolCallStatus(models.TextChoices):
    STARTED = "started", "已开始"
    SUCCEEDED = "succeeded", "成功"
    FAILED = "failed", "失败"


class ToolCall(TimeStampedModel):
    """记录一次工具调用的脱敏输入、结果和失败信息。"""

    run = models.ForeignKey(AgentRun, on_delete=models.PROTECT, related_name="tool_calls")
    call_id = models.CharField("调用标识", max_length=128)
    tool_name = models.CharField("工具名称", max_length=100)
    tool_version = models.CharField("工具版本", max_length=40, blank=True)
    idempotency_key = models.CharField("幂等键", max_length=128, blank=True)
    status = models.CharField("状态", max_length=20, choices=ToolCallStatus, default=ToolCallStatus.STARTED)
    arguments_summary = models.JSONField("参数摘要", default=dict)
    result_summary = models.JSONField("结果摘要", null=True, blank=True)
    error_code = models.CharField("错误码", max_length=80, blank=True)
    error_summary = models.TextField("错误摘要", blank=True)
    started_at = models.DateTimeField("开始时间")
    finished_at = models.DateTimeField("结束时间", null=True, blank=True)
    duration_ms = models.PositiveBigIntegerField("耗时毫秒", null=True, blank=True)

    class Meta:
        indexes = [models.Index(fields=("run", "started_at"), name="tool_run_started_idx")]
        constraints = [
            models.UniqueConstraint(fields=("run", "call_id"), name="tool_run_call_uniq"),
            models.UniqueConstraint(
                fields=("run", "idempotency_key"),
                condition=~Q(idempotency_key=""),
                name="tool_run_idempotency_uniq",
            ),
        ]


class ApprovalStatus(models.TextChoices):
    PENDING = "pending", "待处理"
    APPROVED = "approved", "已通过"
    REJECTED = "rejected", "已拒绝"
    EXPIRED = "expired", "已过期"
    CANCELLED = "cancelled", "已取消"


class HumanApproval(TimeStampedModel):
    """保存高风险动作的人工确认请求与处理证据。"""

    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    run = models.ForeignKey(AgentRun, on_delete=models.PROTECT, related_name="approvals")
    request_key = models.CharField("请求键", max_length=128)
    approval_type = models.CharField("确认类型", max_length=64)
    status = models.CharField("状态", max_length=20, choices=ApprovalStatus, default=ApprovalStatus.PENDING)
    request_summary = models.JSONField("请求摘要", default=dict)
    decision_summary = models.JSONField("处理摘要", null=True, blank=True)
    requested_at = models.DateTimeField("请求时间")
    resolved_at = models.DateTimeField("处理时间", null=True, blank=True)
    resolved_by = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.PROTECT,
        null=True,
        blank=True,
        related_name="resolved_agent_approvals",
    )

    class Meta:
        indexes = [models.Index(fields=("status", "requested_at"), name="approval_status_time_idx")]
        constraints = [models.UniqueConstraint(fields=("run", "request_key"), name="approval_run_key_uniq")]