package coderd

import (
	"database/sql"
	"errors"
	"fmt"
	"net/http"
	"time"

	"github.com/go-chi/render"
	"github.com/google/uuid"

	"github.com/coder/coder/database"
	"github.com/coder/coder/httpapi"
)

// CreateParameterValueRequest is used to create a new parameter value for a scope.
type CreateParameterValueRequest struct {
	Name              string                              `json:"name"`
	SourceValue       string                              `json:"source_value"`
	SourceScheme      database.ParameterSourceScheme      `json:"source_scheme"`
	DestinationScheme database.ParameterDestinationScheme `json:"destination_scheme"`
	DestinationValue  string                              `json:"destination_value"`
}

// ParameterValue represents a set value for the scope.
type ParameterValue struct {
	ID                uuid.UUID                           `json:"id"`
	Name              string                              `json:"name"`
	CreatedAt         time.Time                           `json:"created_at"`
	UpdatedAt         time.Time                           `json:"updated_at"`
	Scope             database.ParameterScope             `json:"scope"`
	ScopeID           string                              `json:"scope_id"`
	SourceScheme      database.ParameterSourceScheme      `json:"source_scheme"`
	DestinationScheme database.ParameterDestinationScheme `json:"destination_scheme"`
	DestinationValue  string                              `json:"destination_value"`
}

// Abstracts creating parameters into a single request/response format.
// Callers are in charge of validating the requester has permissions to
// perform the creation.
func postParameterValueForScope(rw http.ResponseWriter, r *http.Request, db database.Store, scope database.ParameterScope, scopeID string) {
	var createRequest CreateParameterValueRequest
	if !httpapi.Read(rw, r, &createRequest) {
		return
	}
	parameterValue, err := db.InsertParameterValue(r.Context(), database.InsertParameterValueParams{
		ID:                uuid.New(),
		Name:              createRequest.Name,
		CreatedAt:         database.Now(),
		UpdatedAt:         database.Now(),
		Scope:             scope,
		ScopeID:           scopeID,
		SourceScheme:      createRequest.SourceScheme,
		SourceValue:       createRequest.SourceValue,
		DestinationScheme: createRequest.DestinationScheme,
		DestinationValue:  createRequest.DestinationValue,
	})
	if err != nil {
		httpapi.Write(rw, http.StatusInternalServerError, httpapi.Response{
			Message: fmt.Sprintf("insert parameter value: %s", err),
		})
		return
	}

	render.Status(r, http.StatusCreated)
	render.JSON(rw, r, parameterValue)
}

// Abstracts returning parameters for a scope into a standardized
// request/response format. Callers are responsible for checking
// requester permissions.
func parametersForScope(rw http.ResponseWriter, r *http.Request, db database.Store, req database.GetParameterValuesByScopeParams) {
	parameterValues, err := db.GetParameterValuesByScope(r.Context(), req)
	if errors.Is(err, sql.ErrNoRows) {
		err = nil
		parameterValues = []database.ParameterValue{}
	}
	if err != nil {
		httpapi.Write(rw, http.StatusInternalServerError, httpapi.Response{
			Message: fmt.Sprintf("get parameter values: %s", err),
		})
		return
	}

	apiParameterValues := make([]ParameterValue, 0, len(parameterValues))
	for _, parameterValue := range parameterValues {
		apiParameterValues = append(apiParameterValues, convertParameterValue(parameterValue))
	}

	render.Status(r, http.StatusOK)
	render.JSON(rw, r, apiParameterValues)
}

func convertParameterValue(parameterValue database.ParameterValue) ParameterValue {
	return ParameterValue{
		ID:                parameterValue.ID,
		Name:              parameterValue.Name,
		CreatedAt:         parameterValue.CreatedAt,
		UpdatedAt:         parameterValue.UpdatedAt,
		Scope:             parameterValue.Scope,
		ScopeID:           parameterValue.ScopeID,
		SourceScheme:      parameterValue.SourceScheme,
		DestinationScheme: parameterValue.DestinationScheme,
		DestinationValue:  parameterValue.DestinationValue,
	}
}