// Copyright 2023-2026 Princess Beef Heavy Industries, LLC / Dave Shanley
// SPDX-License-Identifier: MIT

package parameters

import (
	"fmt"
	"net/http"
	"strconv"
	"strings"

	"github.com/pb33f/libopenapi/datamodel/high/base"

	v3 "github.com/pb33f/libopenapi/datamodel/high/v3"

	"github.com/pb33f/libopenapi-validator/errors"
	"github.com/pb33f/libopenapi-validator/helpers"
	"github.com/pb33f/libopenapi-validator/paths"
	"github.com/pb33f/libopenapi-validator/strict"
)

func (v *paramValidator) ValidateCookieParams(request *http.Request) (bool, []*errors.ValidationError) {
	pathItem, errs, foundPath := paths.FindPath(request, v.document, v.options)
	if len(errs) > 0 {
		return false, errs
	}
	return v.ValidateCookieParamsWithPathItem(request, pathItem, foundPath)
}

func (v *paramValidator) ValidateCookieParamsWithPathItem(request *http.Request, pathItem *v3.PathItem, pathValue string) (bool, []*errors.ValidationError) {
	if pathItem == nil {
		return false, []*errors.ValidationError{{
			ValidationType:    helpers.PathValidation,
			ValidationSubType: helpers.ValidationMissing,
			Message:           fmt.Sprintf("%s Path '%s' not found", request.Method, request.URL.Path),
			Reason: fmt.Sprintf("The %s request contains a path of '%s' "+
				"however that path, or the %s method for that path does not exist in the specification",
				request.Method, request.URL.Path, request.Method),
			SpecLine: -1,
			SpecCol:  -1,
			HowToFix: errors.HowToFixPath,
		}}
	}
	// extract params for the operation
	params := helpers.ExtractParamsForOperation(request, pathItem)
	validationErrors := v.validateContentParameters(request, pathItem, pathValue, helpers.Cookie)
	operation := strings.ToLower(request.Method)

	// build a map of cookies from the request for efficient lookup
	cookieMap := make(map[string]*http.Cookie)
	for _, cookie := range request.Cookies() {
		cookieMap[cookie.Name] = cookie
	}

	for _, p := range params {
		if p.In == helpers.Cookie && p.Schema != nil {
			// look up the cookie by name (cookies are case-sensitive)
			cookie, found := cookieMap[p.Name]
			if !found {
				// cookie not present in request - check if required
				if p.Required != nil && *p.Required {
					validationErrors = append(validationErrors, errors.CookieParameterMissing(p, pathValue, operation, ""))
				}
				continue
			}

			var sch *base.Schema
			if p.Schema != nil {
				sch = p.Schema.Schema()
			}

			// Get rendered schema for ReferenceSchema field in errors (uses cache if available)
			renderedSchema := GetRenderedSchema(sch, v.options)

			pType := sch.Type

			for _, ty := range pType {
				switch ty {
				case helpers.Integer:
					if _, err := strconv.ParseInt(cookie.Value, 10, 64); err != nil {
						validationErrors = append(validationErrors,
							errors.InvalidCookieParamInteger(p, strings.ToLower(cookie.Value), sch, pathValue, operation, renderedSchema))
						break
					}
					// validate value matches allowed enum values
					if sch.Enum != nil {
						matchFound := false
						for _, enumVal := range sch.Enum {
							if strings.TrimSpace(cookie.Value) == fmt.Sprint(enumVal.Value) {
								matchFound = true
								break
							}
						}
						if !matchFound {
							validationErrors = append(validationErrors,
								errors.IncorrectCookieParamEnum(p, strings.ToLower(cookie.Value), sch, pathValue, operation, renderedSchema))
						}
					}
				case helpers.Number:
					if _, err := strconv.ParseFloat(cookie.Value, 64); err != nil {
						validationErrors = append(validationErrors,
							errors.InvalidCookieParamNumber(p, strings.ToLower(cookie.Value), sch, pathValue, operation, renderedSchema))
						break
					}
					// validate value matches allowed enum values
					if sch.Enum != nil {
						matchFound := false
						for _, enumVal := range sch.Enum {
							if strings.TrimSpace(cookie.Value) == fmt.Sprint(enumVal.Value) {
								matchFound = true
								break
							}
						}
						if !matchFound {
							validationErrors = append(validationErrors,
								errors.IncorrectCookieParamEnum(p, strings.ToLower(cookie.Value), sch, pathValue, operation, renderedSchema))
						}
					}
				case helpers.Boolean:
					if _, err := strconv.ParseBool(cookie.Value); err != nil {
						validationErrors = append(validationErrors,
							errors.IncorrectCookieParamBool(p, strings.ToLower(cookie.Value), sch, pathValue, operation, renderedSchema))
					}
				case helpers.Object:
					if !p.IsExploded() {
						encodedObj := helpers.ConstructMapFromCSVWithSchema(cookie.Value, sch)

						// if a schema was extracted
						if sch != nil {
							validationErrors = append(validationErrors,
								ValidateParameterSchema(sch, encodedObj, "",
									"Cookie parameter",
									"The cookie parameter",
									p.Name,
									helpers.ParameterValidation,
									helpers.ParameterValidationQuery,
									v.options)...)
						}
					}
				case helpers.Array:

					if !p.IsExploded() {
						// well we're already in an array, so we need to check the items schema
						// to ensure this array items matches the type
						// only check if items is a schema, not a boolean
						if sch.Items.IsA() {
							validationErrors = append(validationErrors,
								ValidateCookieArray(sch, p, cookie.Value, pathValue, operation, renderedSchema)...)
						}
					}

				case helpers.String:

					// check if the schema has an enum, and if so, match the value against one of
					// the defined enum values.
					if sch.Enum != nil {
						matchFound := false
						for _, enumVal := range sch.Enum {
							if strings.TrimSpace(cookie.Value) == fmt.Sprint(enumVal.Value) {
								matchFound = true
								break
							}
						}
						if !matchFound {
							validationErrors = append(validationErrors,
								errors.IncorrectCookieParamEnum(p, strings.ToLower(cookie.Value), sch, pathValue, operation, renderedSchema))
							break
						}
					}
					validationErrors = append(validationErrors,
						ValidateSingleParameterSchema(
							sch,
							cookie.Value,
							"Cookie parameter",
							"The cookie parameter",
							p.Name,
							helpers.ParameterValidation,
							helpers.ParameterValidationCookie,
							v.options,
							pathValue,
							operation,
						)...)
				}
			}
		}
	}

	errors.PopulateValidationErrors(validationErrors, request, pathValue)

	if len(validationErrors) > 0 {
		return false, validationErrors
	}

	// strict mode: check for undeclared cookies
	if v.options.StrictMode {
		undeclaredCookies := strict.ValidateCookies(request, params, v.options)
		for _, undeclared := range undeclaredCookies {
			validationErrors = append(validationErrors,
				errors.UndeclaredCookieError(
					undeclared.Path,
					undeclared.Name,
					undeclared.Value,
					undeclared.DeclaredProperties,
					request.URL.Path,
					request.Method,
				))
		}
	}

	if len(validationErrors) > 0 {
		return false, validationErrors
	}
	return true, nil
}
