package dsb

import (
	"time"

	"github.com/google/uuid"
)

// ============================================================================
// Core Models
// ============================================================================

// Assignment represents a DSB-to-tenant assignment.
type Assignment struct {
	ID                 uuid.UUID  `json:"id"`
	DSBUserID          uuid.UUID  `json:"dsb_user_id"`
	TenantID           uuid.UUID  `json:"tenant_id"`
	TenantName         string     `json:"tenant_name"`          // populated via JOIN
	TenantSlug         string     `json:"tenant_slug"`          // populated via JOIN
	Status             string     `json:"status"`               // active, paused, terminated
	ContractStart      time.Time  `json:"contract_start"`
	ContractEnd        *time.Time `json:"contract_end,omitempty"`
	MonthlyHoursBudget float64    `json:"monthly_hours_budget"`
	Notes              string     `json:"notes"`
	CreatedAt          time.Time  `json:"created_at"`
	UpdatedAt          time.Time  `json:"updated_at"`
}

// HourEntry represents a DSB time tracking entry.
type HourEntry struct {
	ID           uuid.UUID `json:"id"`
	AssignmentID uuid.UUID `json:"assignment_id"`
	Date         time.Time `json:"date"`
	Hours        float64   `json:"hours"`
	Category     string    `json:"category"`    // dsfa_review, consultation, audit, training, incident_response, documentation, meeting, other
	Description  string    `json:"description"`
	Billable     bool      `json:"billable"`
	CreatedAt    time.Time `json:"created_at"`
}

// Task represents a DSB task/work item.
type Task struct {
	ID           uuid.UUID  `json:"id"`
	AssignmentID uuid.UUID  `json:"assignment_id"`
	Title        string     `json:"title"`
	Description  string     `json:"description"`
	Category     string     `json:"category"`     // dsfa_review, dsr_response, incident_review, audit_preparation, policy_review, training, consultation, other
	Priority     string     `json:"priority"`     // low, medium, high, urgent
	Status       string     `json:"status"`       // open, in_progress, waiting, completed, cancelled
	DueDate      *time.Time `json:"due_date,omitempty"`
	CompletedAt  *time.Time `json:"completed_at,omitempty"`
	CreatedAt    time.Time  `json:"created_at"`
	UpdatedAt    time.Time  `json:"updated_at"`
}

// Communication represents a DSB communication log entry.
type Communication struct {
	ID           uuid.UUID `json:"id"`
	AssignmentID uuid.UUID `json:"assignment_id"`
	Direction    string    `json:"direction"`    // inbound, outbound
	Channel      string    `json:"channel"`      // email, phone, meeting, portal, letter
	Subject      string    `json:"subject"`
	Content      string    `json:"content"`
	Participants string    `json:"participants"`
	CreatedAt    time.Time `json:"created_at"`
}

// ============================================================================
// Dashboard Models
// ============================================================================

// DSBDashboard provides the aggregated overview for a DSB user.
type DSBDashboard struct {
	Assignments        []AssignmentOverview `json:"assignments"`
	TotalAssignments   int                 `json:"total_assignments"`
	ActiveAssignments  int                 `json:"active_assignments"`
	TotalHoursThisMonth float64            `json:"total_hours_this_month"`
	OpenTasks          int                 `json:"open_tasks"`
	UrgentTasks        int                 `json:"urgent_tasks"`
	GeneratedAt        time.Time           `json:"generated_at"`
}

// AssignmentOverview enriches an Assignment with aggregated metrics.
type AssignmentOverview struct {
	Assignment
	ComplianceScore int        `json:"compliance_score"`
	HoursThisMonth  float64    `json:"hours_this_month"`
	HoursBudget     float64    `json:"hours_budget"`
	OpenTaskCount   int        `json:"open_task_count"`
	UrgentTaskCount int        `json:"urgent_task_count"`
	NextDeadline    *time.Time `json:"next_deadline,omitempty"`
}

// ============================================================================
// Request Models
// ============================================================================

// CreateAssignmentRequest is the request body for creating an assignment.
type CreateAssignmentRequest struct {
	DSBUserID          uuid.UUID  `json:"dsb_user_id" binding:"required"`
	TenantID           uuid.UUID  `json:"tenant_id" binding:"required"`
	Status             string     `json:"status"`
	ContractStart      time.Time  `json:"contract_start" binding:"required"`
	ContractEnd        *time.Time `json:"contract_end,omitempty"`
	MonthlyHoursBudget float64    `json:"monthly_hours_budget"`
	Notes              string     `json:"notes"`
}

// UpdateAssignmentRequest is the request body for updating an assignment.
type UpdateAssignmentRequest struct {
	Status             *string    `json:"status,omitempty"`
	ContractEnd        *time.Time `json:"contract_end,omitempty"`
	MonthlyHoursBudget *float64   `json:"monthly_hours_budget,omitempty"`
	Notes              *string    `json:"notes,omitempty"`
}

// CreateHourEntryRequest is the request body for creating a time entry.
type CreateHourEntryRequest struct {
	Date        time.Time `json:"date" binding:"required"`
	Hours       float64   `json:"hours" binding:"required"`
	Category    string    `json:"category" binding:"required"`
	Description string    `json:"description" binding:"required"`
	Billable    *bool     `json:"billable,omitempty"`
}

// CreateTaskRequest is the request body for creating a task.
type CreateTaskRequest struct {
	Title       string     `json:"title" binding:"required"`
	Description string     `json:"description"`
	Category    string     `json:"category" binding:"required"`
	Priority    string     `json:"priority"`
	DueDate     *time.Time `json:"due_date,omitempty"`
}

// UpdateTaskRequest is the request body for updating a task.
type UpdateTaskRequest struct {
	Title       *string    `json:"title,omitempty"`
	Description *string    `json:"description,omitempty"`
	Category    *string    `json:"category,omitempty"`
	Priority    *string    `json:"priority,omitempty"`
	Status      *string    `json:"status,omitempty"`
	DueDate     *time.Time `json:"due_date,omitempty"`
}

// CreateCommunicationRequest is the request body for creating a communication entry.
type CreateCommunicationRequest struct {
	Direction    string `json:"direction" binding:"required"`
	Channel      string `json:"channel" binding:"required"`
	Subject      string `json:"subject" binding:"required"`
	Content      string `json:"content"`
	Participants string `json:"participants"`
}

// ============================================================================
// Summary Models
// ============================================================================

// HoursSummary provides aggregated hour statistics for an assignment.
type HoursSummary struct {
	TotalHours    float64            `json:"total_hours"`
	BillableHours float64            `json:"billable_hours"`
	ByCategory    map[string]float64 `json:"by_category"`
	Period        string             `json:"period"` // YYYY-MM or "all"
}