package requests

import (
	"encoding/json"
	"strings"
	"time"

	"github.com/shopspring/decimal"
)

// FlexibleDate handles both "2025-11-27" and "2025-11-27T00:00:00Z" formats
type FlexibleDate struct {
	time.Time
}

func (fd *FlexibleDate) UnmarshalJSON(data []byte) error {
	// Remove quotes
	s := strings.Trim(string(data), "\"")
	if s == "" || s == "null" {
		return nil
	}

	// Try RFC3339 first (full datetime)
	t, err := time.Parse(time.RFC3339, s)
	if err == nil {
		fd.Time = t
		return nil
	}

	// Try date-only format
	t, err = time.Parse("2006-01-02", s)
	if err == nil {
		fd.Time = t
		return nil
	}

	return err
}

func (fd FlexibleDate) MarshalJSON() ([]byte, error) {
	if fd.Time.IsZero() {
		return json.Marshal(nil)
	}
	return json.Marshal(fd.Time.Format(time.RFC3339))
}

// ToTimePtr returns a pointer to the underlying time, or nil if zero
func (fd *FlexibleDate) ToTimePtr() *time.Time {
	if fd == nil || fd.Time.IsZero() {
		return nil
	}
	return &fd.Time
}

// BulkCreateTasksRequest represents a batch create. Used by onboarding to
// insert 1-N selected tasks atomically in a single transaction so that a
// failure halfway through doesn't leave a partial task list behind.
//
// ResidenceID is validated once at the service layer; individual task
// entries must reference the same residence or be left empty (the service
// overrides each entry's ResidenceID with the top-level value).
type BulkCreateTasksRequest struct {
	ResidenceID uint                `json:"residence_id" validate:"required"`
	Tasks       []CreateTaskRequest `json:"tasks" validate:"required,min=1,max=50,dive"`
}

// CreateTaskRequest represents the request to create a task
type CreateTaskRequest struct {
	ResidenceID        uint             `json:"residence_id" validate:"required"`
	Title              string           `json:"title" validate:"required,min=1,max=200"`
	Description        string           `json:"description" validate:"max=10000"`
	CategoryID         *uint            `json:"category_id"`
	PriorityID         *uint            `json:"priority_id"`
	FrequencyID        *uint            `json:"frequency_id"`
	CustomIntervalDays *int             `json:"custom_interval_days" validate:"omitempty,min=1"` // For "Custom" frequency, user-specified days
	InProgress         bool             `json:"in_progress"`
	AssignedToID       *uint            `json:"assigned_to_id"`
	DueDate            *FlexibleDate    `json:"due_date"`
	EstimatedCost      *decimal.Decimal `json:"estimated_cost"`
	ContractorID       *uint            `json:"contractor_id"`
	// TemplateID links the created task to the TaskTemplate it was spawned from
	// (e.g. onboarding suggestion or catalog pick). Optional — custom tasks
	// leave this nil.
	TemplateID *uint `json:"template_id"`
}

// UpdateTaskRequest represents the request to update a task
type UpdateTaskRequest struct {
	Title              *string          `json:"title" validate:"omitempty,min=1,max=200"`
	Description        *string          `json:"description" validate:"omitempty,max=10000"`
	CategoryID         *uint            `json:"category_id"`
	PriorityID         *uint            `json:"priority_id"`
	FrequencyID        *uint            `json:"frequency_id"`
	CustomIntervalDays *int             `json:"custom_interval_days" validate:"omitempty,min=1"` // For "Custom" frequency, user-specified days
	InProgress         *bool            `json:"in_progress"`
	AssignedToID       *uint            `json:"assigned_to_id"`
	DueDate            *FlexibleDate    `json:"due_date"`
	EstimatedCost      *decimal.Decimal `json:"estimated_cost"`
	ActualCost         *decimal.Decimal `json:"actual_cost"`
	ContractorID       *uint            `json:"contractor_id"`
}

// CreateTaskCompletionRequest represents the request to create a task completion
type CreateTaskCompletionRequest struct {
	TaskID      uint             `json:"task_id" validate:"required"`
	CompletedAt *time.Time       `json:"completed_at"` // Defaults to now
	Notes       string           `json:"notes" validate:"max=10000"`
	ActualCost  *decimal.Decimal `json:"actual_cost"`
	Rating      *int             `json:"rating" validate:"omitempty,min=1,max=5"` // 1-5 star rating
	ImageURLs   []string         `json:"image_urls" validate:"omitempty,max=20,dive,max=500"` // Multiple image URLs
}

// UpdateTaskCompletionRequest represents the request to update a task completion
type UpdateTaskCompletionRequest struct {
	Notes      *string          `json:"notes" validate:"omitempty,max=10000"`
	ActualCost *decimal.Decimal `json:"actual_cost"`
	Rating     *int             `json:"rating" validate:"omitempty,min=1,max=5"`
	ImageURLs  []string         `json:"image_urls" validate:"omitempty,max=20,dive,max=500"`
}

// CompletionImageInput represents an image to add to a completion
type CompletionImageInput struct {
	ImageURL string `json:"image_url" validate:"required"`
	Caption  string `json:"caption"`
}