package coderd

import (
	"database/sql"
	"errors"
	"fmt"
	"net/http"
	"slices"
	"strings"

	"github.com/google/uuid"

	"github.com/coder/coder/v2/coderd/audit"
	"github.com/coder/coder/v2/coderd/database"
	"github.com/coder/coder/v2/coderd/httpapi"
	"github.com/coder/coder/v2/coderd/httpmw"
	"github.com/coder/coder/v2/coderd/rbac"
	"github.com/coder/coder/v2/codersdk"
)

// This endpoint is experimental and not guaranteed to be stable, so we're not
// generating public-facing documentation for it.
func (api *API) aiTasksPrompts(rw http.ResponseWriter, r *http.Request) {
	ctx := r.Context()

	buildIDsParam := r.URL.Query().Get("build_ids")
	if buildIDsParam == "" {
		httpapi.Write(ctx, rw, http.StatusBadRequest, codersdk.Response{
			Message: "build_ids query parameter is required",
		})
		return
	}

	// Parse build IDs
	buildIDStrings := strings.Split(buildIDsParam, ",")
	buildIDs := make([]uuid.UUID, 0, len(buildIDStrings))
	for _, idStr := range buildIDStrings {
		id, err := uuid.Parse(strings.TrimSpace(idStr))
		if err != nil {
			httpapi.Write(ctx, rw, http.StatusBadRequest, codersdk.Response{
				Message: fmt.Sprintf("Invalid build ID format: %s", idStr),
				Detail:  err.Error(),
			})
			return
		}
		buildIDs = append(buildIDs, id)
	}

	parameters, err := api.Database.GetWorkspaceBuildParametersByBuildIDs(ctx, buildIDs)
	if err != nil {
		httpapi.Write(ctx, rw, http.StatusInternalServerError, codersdk.Response{
			Message: "Internal error fetching workspace build parameters.",
			Detail:  err.Error(),
		})
		return
	}

	promptsByBuildID := make(map[string]string, len(parameters))
	for _, param := range parameters {
		if param.Name != codersdk.AITaskPromptParameterName {
			continue
		}
		buildID := param.WorkspaceBuildID.String()
		promptsByBuildID[buildID] = param.Value
	}

	httpapi.Write(ctx, rw, http.StatusOK, codersdk.AITasksPromptsResponse{
		Prompts: promptsByBuildID,
	})
}

// This endpoint is experimental and not guaranteed to be stable, so we're not
// generating public-facing documentation for it.
func (api *API) tasksCreate(rw http.ResponseWriter, r *http.Request) {
	var (
		ctx     = r.Context()
		apiKey  = httpmw.APIKey(r)
		auditor = api.Auditor.Load()
		mems    = httpmw.OrganizationMembersParam(r)
	)

	var req codersdk.CreateTaskRequest
	if !httpapi.Read(ctx, rw, r, &req) {
		return
	}

	hasAITask, err := api.Database.GetTemplateVersionHasAITask(ctx, req.TemplateVersionID)
	if err != nil {
		if errors.Is(err, sql.ErrNoRows) || rbac.IsUnauthorizedError(err) {
			httpapi.ResourceNotFound(rw)
			return
		}

		httpapi.Write(ctx, rw, http.StatusInternalServerError, codersdk.Response{
			Message: "Internal error fetching whether the template version has an AI task.",
			Detail:  err.Error(),
		})
		return
	}
	if !hasAITask {
		httpapi.Write(ctx, rw, http.StatusBadRequest, codersdk.Response{
			Message: fmt.Sprintf(`Template does not have required parameter %q`, codersdk.AITaskPromptParameterName),
		})
		return
	}

	createReq := codersdk.CreateWorkspaceRequest{
		Name:                    req.Name,
		TemplateVersionID:       req.TemplateVersionID,
		TemplateVersionPresetID: req.TemplateVersionPresetID,
		RichParameterValues: []codersdk.WorkspaceBuildParameter{
			{Name: codersdk.AITaskPromptParameterName, Value: req.Prompt},
		},
	}

	var owner workspaceOwner
	if mems.User != nil {
		// This user fetch is an optimization path for the most common case of creating a
		// task for 'Me'.
		//
		// This is also required to allow `owners` to create workspaces for users
		// that are not in an organization.
		owner = workspaceOwner{
			ID:        mems.User.ID,
			Username:  mems.User.Username,
			AvatarURL: mems.User.AvatarURL,
		}
	} else {
		// A task can still be created if the caller can read the organization
		// member. The organization is required, which can be sourced from the
		// template.
		//
		// TODO: This code gets called twice for each workspace build request.
		//   This is inefficient and costs at most 2 extra RTTs to the DB.
		//   This can be optimized. It exists as it is now for code simplicity.
		//   The most common case is to create a workspace for 'Me'. Which does
		//   not enter this code branch.
		template, ok := requestTemplate(ctx, rw, createReq, api.Database)
		if !ok {
			return
		}

		// If the caller can find the organization membership in the same org
		// as the template, then they can continue.
		orgIndex := slices.IndexFunc(mems.Memberships, func(mem httpmw.OrganizationMember) bool {
			return mem.OrganizationID == template.OrganizationID
		})
		if orgIndex == -1 {
			httpapi.ResourceNotFound(rw)
			return
		}

		member := mems.Memberships[orgIndex]
		owner = workspaceOwner{
			ID:        member.UserID,
			Username:  member.Username,
			AvatarURL: member.AvatarURL,
		}
	}

	aReq, commitAudit := audit.InitRequest[database.WorkspaceTable](rw, &audit.RequestParams{
		Audit:   *auditor,
		Log:     api.Logger,
		Request: r,
		Action:  database.AuditActionCreate,
		AdditionalFields: audit.AdditionalFields{
			WorkspaceOwner: owner.Username,
		},
	})

	defer commitAudit()
	createWorkspace(ctx, aReq, apiKey.UserID, api, owner, createReq, rw, r)
}