package tools

import (
	"context"
	"strings"
	"time"

	"github.com/google/uuid"
	"github.com/modelcontextprotocol/go-sdk/mcp"

	"git.warky.dev/wdevs/amcs/internal/store"
	ext "git.warky.dev/wdevs/amcs/internal/types"
)

type MaintenanceTool struct {
	store *store.DB
}

func NewMaintenanceTool(db *store.DB) *MaintenanceTool {
	return &MaintenanceTool{store: db}
}

// add_maintenance_task

type AddMaintenanceTaskInput struct {
	Name          string     `json:"name" jsonschema:"task name"`
	Category      string     `json:"category,omitempty" jsonschema:"e.g. hvac, plumbing, exterior, appliance, landscaping"`
	FrequencyDays *int       `json:"frequency_days,omitempty" jsonschema:"recurrence interval in days; omit for one-time tasks"`
	NextDue       *time.Time `json:"next_due,omitempty" jsonschema:"when the task is next due"`
	Priority      string     `json:"priority,omitempty" jsonschema:"low, medium, high, or urgent (default: medium)"`
	Notes         string     `json:"notes,omitempty"`
}

type AddMaintenanceTaskOutput struct {
	Task ext.MaintenanceTask `json:"task"`
}

func (t *MaintenanceTool) AddTask(ctx context.Context, _ *mcp.CallToolRequest, in AddMaintenanceTaskInput) (*mcp.CallToolResult, AddMaintenanceTaskOutput, error) {
	if strings.TrimSpace(in.Name) == "" {
		return nil, AddMaintenanceTaskOutput{}, errInvalidInput("name is required")
	}
	priority := strings.TrimSpace(in.Priority)
	if priority == "" {
		priority = "medium"
	}
	task, err := t.store.AddMaintenanceTask(ctx, ext.MaintenanceTask{
		Name:          strings.TrimSpace(in.Name),
		Category:      strings.TrimSpace(in.Category),
		FrequencyDays: in.FrequencyDays,
		NextDue:       in.NextDue,
		Priority:      priority,
		Notes:         strings.TrimSpace(in.Notes),
	})
	if err != nil {
		return nil, AddMaintenanceTaskOutput{}, err
	}
	return nil, AddMaintenanceTaskOutput{Task: task}, nil
}

// log_maintenance

type LogMaintenanceInput struct {
	TaskID      uuid.UUID  `json:"task_id" jsonschema:"id of the maintenance task"`
	CompletedAt *time.Time `json:"completed_at,omitempty" jsonschema:"when the work was done (defaults to now)"`
	PerformedBy string     `json:"performed_by,omitempty" jsonschema:"who did the work (self, vendor name, etc.)"`
	Cost        *float64   `json:"cost,omitempty" jsonschema:"cost of the work"`
	Notes       string     `json:"notes,omitempty"`
	NextAction  string     `json:"next_action,omitempty" jsonschema:"recommended follow-up"`
}

type LogMaintenanceOutput struct {
	Log ext.MaintenanceLog `json:"log"`
}

func (t *MaintenanceTool) LogWork(ctx context.Context, _ *mcp.CallToolRequest, in LogMaintenanceInput) (*mcp.CallToolResult, LogMaintenanceOutput, error) {
	completedAt := time.Now()
	if in.CompletedAt != nil {
		completedAt = *in.CompletedAt
	}
	log, err := t.store.LogMaintenance(ctx, ext.MaintenanceLog{
		TaskID:      in.TaskID,
		CompletedAt: completedAt,
		PerformedBy: strings.TrimSpace(in.PerformedBy),
		Cost:        in.Cost,
		Notes:       strings.TrimSpace(in.Notes),
		NextAction:  strings.TrimSpace(in.NextAction),
	})
	if err != nil {
		return nil, LogMaintenanceOutput{}, err
	}
	return nil, LogMaintenanceOutput{Log: log}, nil
}

// get_upcoming_maintenance

type GetUpcomingMaintenanceInput struct {
	DaysAhead int `json:"days_ahead,omitempty" jsonschema:"how many days to look ahead (default: 30)"`
}

type GetUpcomingMaintenanceOutput struct {
	Tasks []ext.MaintenanceTask `json:"tasks"`
}

func (t *MaintenanceTool) GetUpcoming(ctx context.Context, _ *mcp.CallToolRequest, in GetUpcomingMaintenanceInput) (*mcp.CallToolResult, GetUpcomingMaintenanceOutput, error) {
	tasks, err := t.store.GetUpcomingMaintenance(ctx, in.DaysAhead)
	if err != nil {
		return nil, GetUpcomingMaintenanceOutput{}, err
	}
	if tasks == nil {
		tasks = []ext.MaintenanceTask{}
	}
	return nil, GetUpcomingMaintenanceOutput{Tasks: tasks}, nil
}

// search_maintenance_history

type SearchMaintenanceHistoryInput struct {
	Query    string     `json:"query,omitempty" jsonschema:"search text matching task name or notes"`
	Category string     `json:"category,omitempty" jsonschema:"filter by task category"`
	Start    *time.Time `json:"start,omitempty" jsonschema:"filter logs completed on or after this date"`
	End      *time.Time `json:"end,omitempty" jsonschema:"filter logs completed on or before this date"`
}

type SearchMaintenanceHistoryOutput struct {
	Logs []ext.MaintenanceLogWithTask `json:"logs"`
}

func (t *MaintenanceTool) SearchHistory(ctx context.Context, _ *mcp.CallToolRequest, in SearchMaintenanceHistoryInput) (*mcp.CallToolResult, SearchMaintenanceHistoryOutput, error) {
	logs, err := t.store.SearchMaintenanceHistory(ctx, in.Query, in.Category, in.Start, in.End)
	if err != nil {
		return nil, SearchMaintenanceHistoryOutput{}, err
	}
	if logs == nil {
		logs = []ext.MaintenanceLogWithTask{}
	}
	return nil, SearchMaintenanceHistoryOutput{Logs: logs}, nil
}