package expense

import (
	"errors"
	"time"

	"github.com/gofiber/fiber/v2"
	"github.com/jackc/pgx/v5"
	"github.com/techxcar/backend/internal/auth"
	"github.com/techxcar/backend/pkg/database"
)

var allowedTypes = map[string]bool{
	"fuel":  true,
	"parts": true,
	"tools": true,
	"other": true,
}

func RegisterRoutes(app *fiber.App, db *database.DB, secret string) {
	ro := []fiber.Handler{
		auth.RequireAuth(secret),
		auth.RequireRole("tenant_admin", "manager", "technician"),
		auth.TenantMiddleware(db),
	}
	write := []fiber.Handler{
		auth.RequireAuth(secret),
		auth.RequireRole("tenant_admin", "manager"),
		auth.TenantMiddleware(db),
	}

	app.Get("/api/v1/expenses", append(ro, listExpensesH())...)
	app.Post("/api/v1/expenses", append(write, createExpenseH())...)
	app.Delete("/api/v1/expenses/:id", append(write, deleteExpenseH())...)
}

func listExpensesH() fiber.Handler {
	return func(c *fiber.Ctx) error {
		conn := auth.GetConn(c)
		list, err := ListExpenses(c.Context(), conn, c.Query("type"))
		if err != nil {
			return fiber.NewError(500, "erro ao listar despesas")
		}
		if list == nil {
			list = []*Expense{}
		}
		return c.JSON(fiber.Map{"data": list, "error": nil})
	}
}

type expenseBody struct {
	VehicleID   string  `json:"vehicle_id"`
	Type        string  `json:"type"`
	Amount      float64 `json:"amount"`
	Description string  `json:"description"`
	Date        string  `json:"date"` // YYYY-MM-DD
}

func createExpenseH() fiber.Handler {
	return func(c *fiber.Ctx) error {
		var b expenseBody
		if err := c.BodyParser(&b); err != nil {
			return fiber.NewError(400, "corpo do pedido inválido")
		}
		if !allowedTypes[b.Type] {
			return fiber.NewError(400, "tipo inválido: fuel, parts, tools, other")
		}
		if b.Amount <= 0 {
			return fiber.NewError(400, "valor deve ser positivo")
		}
		if b.Date == "" {
			return fiber.NewError(400, "data obrigatória")
		}
		date, err := time.Parse("2006-01-02", b.Date)
		if err != nil {
			return fiber.NewError(400, "data inválida (formato: YYYY-MM-DD)")
		}
		var vehicleID *string
		if b.VehicleID != "" {
			vehicleID = &b.VehicleID
		}
		conn := auth.GetConn(c)
		e, err := CreateExpense(c.Context(), conn, vehicleID, b.Type, b.Description, b.Amount, date)
		if err != nil {
			return fiber.NewError(500, "erro ao registar despesa")
		}
		return c.Status(201).JSON(fiber.Map{"data": e, "error": nil})
	}
}

func deleteExpenseH() fiber.Handler {
	return func(c *fiber.Ctx) error {
		id := c.Params("id")
		conn := auth.GetConn(c)
		err := DeleteExpense(c.Context(), conn, id)
		if errors.Is(err, pgx.ErrNoRows) {
			return fiber.NewError(404, "despesa não encontrada")
		}
		if err != nil {
			return fiber.NewError(500, "erro ao eliminar despesa")
		}
		return c.SendStatus(204)
	}
}