package web

import (
	"encoding/json"
	"io"
	"net/http"
	"strconv"

	"github.com/gin-gonic/gin"
	"github.com/google/uuid"
	"github.com/pkg/errors"

	"github.com/smartcontractkit/chainlink-common/pkg/utils/jsonserializable"
	"github.com/smartcontractkit/chainlink/v2/core/logger/audit"
	"github.com/smartcontractkit/chainlink/v2/core/services/chainlink"
	"github.com/smartcontractkit/chainlink/v2/core/services/job"
	"github.com/smartcontractkit/chainlink/v2/core/services/pipeline"
	"github.com/smartcontractkit/chainlink/v2/core/services/webhook"
	"github.com/smartcontractkit/chainlink/v2/core/web/auth"
	"github.com/smartcontractkit/chainlink/v2/core/web/presenters"
)

// PipelineRunsController manages V2 job run requests.
type PipelineRunsController struct {
	App chainlink.Application
}

// Index returns all pipeline runs for a job.
// Example:
// "GET <application>/jobs/:ID/runs"
func (prc *PipelineRunsController) Index(c *gin.Context, size, page, offset int) {
	id := c.Param("ID")

	// Temporary: if no size is passed in, use a large page size. Remove once frontend can handle pagination
	if c.Query("size") == "" {
		size = 1000
	}

	var pipelineRuns []pipeline.Run
	var count int
	var err error

	ctx := c.Request.Context()
	if id == "" {
		pipelineRuns, count, err = prc.App.JobORM().PipelineRuns(ctx, nil, offset, size)
	} else {
		jobSpec := job.Job{}
		err = jobSpec.SetID(c.Param("ID"))
		if err != nil {
			jsonAPIError(c, http.StatusUnprocessableEntity, err)
			return
		}

		pipelineRuns, count, err = prc.App.JobORM().PipelineRuns(ctx, &jobSpec.ID, offset, size)
	}

	if err != nil {
		jsonAPIError(c, http.StatusInternalServerError, err)
		return
	}

	res := presenters.NewPipelineRunResources(pipelineRuns, prc.App.GetLogger())
	paginatedResponse(c, "pipelineRun", size, page, res, count, err)
}

// Show returns a specified pipeline run.
// Example:
// "GET <application>/jobs/:ID/runs/:runID"
func (prc *PipelineRunsController) Show(c *gin.Context) {
	ctx := c.Request.Context()
	pipelineRun := pipeline.Run{}
	err := pipelineRun.SetID(c.Param("runID"))
	if err != nil {
		jsonAPIError(c, http.StatusUnprocessableEntity, err)
		return
	}

	pipelineRun, err = prc.App.PipelineORM().FindRun(ctx, pipelineRun.ID)
	if err != nil {
		jsonAPIError(c, http.StatusInternalServerError, err)
		return
	}

	res := presenters.NewPipelineRunResource(pipelineRun, prc.App.GetLogger())
	jsonAPIResponse(c, res, "pipelineRun")
}

// Create triggers a pipeline run for a job.
// Example:
// "POST <application>/jobs/:ID/runs"
func (prc *PipelineRunsController) Create(c *gin.Context) {
	ctx := c.Request.Context()
	respondWithPipelineRun := func(jobRunID int64) {
		pipelineRun, err := prc.App.PipelineORM().FindRun(ctx, jobRunID)
		if err != nil {
			jsonAPIError(c, http.StatusInternalServerError, err)
			return
		}
		res := presenters.NewPipelineRunResource(pipelineRun, prc.App.GetLogger())
		jsonAPIResponse(c, res, "pipelineRun")
	}

	bodyBytes, err := io.ReadAll(c.Request.Body)
	if err != nil {
		jsonAPIError(c, http.StatusUnprocessableEntity, err)
		return
	}
	idStr := c.Param("ID")

	user, isUser := auth.GetAuthenticatedUser(c)
	ei, _ := auth.GetAuthenticatedExternalInitiator(c)
	authorizer := webhook.NewAuthorizer(prc.App.GetDB(), user, ei)

	// Is it a UUID? Then process it as a webhook job
	jobUUID, err := uuid.Parse(idStr)
	if err == nil {
		canRun, err2 := authorizer.CanRun(ctx, prc.App.GetConfig().JobPipeline(), jobUUID)
		if err2 != nil {
			jsonAPIError(c, http.StatusInternalServerError, err2)
			return
		}
		if canRun {
			jobRunID, err3 := prc.App.RunWebhookJobV2(ctx, jobUUID, string(bodyBytes), jsonserializable.JSONSerializable{})
			if errors.Is(err3, webhook.ErrJobNotExists) {
				jsonAPIError(c, http.StatusNotFound, err3)
				return
			} else if err3 != nil {
				jsonAPIError(c, http.StatusInternalServerError, err3)
				return
			}
			respondWithPipelineRun(jobRunID)
		} else {
			jsonAPIError(c, http.StatusUnauthorized, errors.Errorf("external initiator %s is not allowed to run job %s", ei.Name, jobUUID))
		}
		return
	}

	// only users are allowed to run jobs using int IDs - EIs not allowed
	if isUser {
		// Is it an int32? Then process it regardless of type
		var jobID int32
		jobID64, err := strconv.ParseInt(idStr, 10, 32)
		if err == nil {
			jobID = int32(jobID64)
			jobRunID, err := prc.App.RunJobV2(ctx, jobID, nil)
			if err != nil {
				jsonAPIError(c, http.StatusInternalServerError, err)
				return
			}
			respondWithPipelineRun(jobRunID)
			return
		}
	}

	jsonAPIError(c, http.StatusUnprocessableEntity, errors.New("bad job ID"))
}

// Resume finishes a task and resumes the pipeline run.
// Example:
// "PATCH <application>/jobs/:ID/runs/:runID"
func (prc *PipelineRunsController) Resume(c *gin.Context) {
	taskID, err := uuid.Parse(c.Param("runID"))
	if err != nil {
		jsonAPIError(c, http.StatusUnprocessableEntity, err)
		return
	}

	rr := pipeline.ResumeRequest{}
	decoder := json.NewDecoder(c.Request.Body)
	err = errors.Wrap(decoder.Decode(&rr), "failed to unmarshal JSON body")
	if err != nil {
		jsonAPIError(c, http.StatusUnprocessableEntity, err)
		return
	}
	result, err := rr.ToResult()
	if err != nil {
		jsonAPIError(c, http.StatusUnprocessableEntity, err)
		return
	}

	if err := prc.App.ResumeJobV2(c.Request.Context(), taskID, result); err != nil {
		jsonAPIError(c, http.StatusInternalServerError, err)
		return
	}

	prc.App.GetAuditLogger().Audit(audit.UnauthedRunResumed, map[string]interface{}{"runID": c.Param("runID")})
	c.Status(http.StatusOK)
}