// Copyright 2022 Woodpecker Authors
// Copyright 2021 Informatyka Boguslawski sp. z o.o. sp.k., http://www.ib.pl/
// Copyright 2018 Drone.IO Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// This file has been modified by Informatyka Boguslawski sp. z o.o. sp.k.

package api

import (
	"bytes"
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"net/http"
	"strconv"
	"time"

	"github.com/woodpecker-ci/woodpecker/server"
	"github.com/woodpecker-ci/woodpecker/server/store/types"

	"github.com/gin-gonic/gin"
	"github.com/rs/zerolog/log"

	"github.com/woodpecker-ci/woodpecker/server/model"
	"github.com/woodpecker-ci/woodpecker/server/pipeline"
	"github.com/woodpecker-ci/woodpecker/server/router/middleware/session"
	"github.com/woodpecker-ci/woodpecker/server/store"
)

func CreatePipeline(c *gin.Context) {
	_store := store.FromContext(c)
	repo := session.Repo(c)

	var p model.PipelineOptions

	err := json.NewDecoder(c.Request.Body).Decode(&p)
	if err != nil {
		_ = c.AbortWithError(http.StatusBadRequest, err)
		return
	}

	user := session.User(c)

	lastCommit, _ := server.Config.Services.Remote.BranchHead(c, user, repo, p.Branch)

	tmpBuild := createTmpPipeline(model.EventManual, lastCommit, repo, user, &p)

	pl, err := pipeline.Create(c, _store, repo, tmpBuild)
	if err != nil {
		handlePipelineErr(c, err)
	} else {
		c.JSON(http.StatusOK, pl)
	}
}

func createTmpPipeline(event model.WebhookEvent, commitSHA string, repo *model.Repo, user *model.User, opts *model.PipelineOptions) *model.Pipeline {
	return &model.Pipeline{
		Event:     event,
		Commit:    commitSHA,
		Branch:    opts.Branch,
		Timestamp: time.Now().UTC().Unix(),

		Avatar:  user.Avatar,
		Message: "MANUAL PIPELINE @ " + opts.Branch,

		Ref:                 opts.Branch,
		AdditionalVariables: opts.Variables,

		Author: user.Login,
		Email:  user.Email,

		// TODO: Generate proper link to commit
		Link: repo.Link,
	}
}

func GetPipelines(c *gin.Context) {
	repo := session.Repo(c)
	page, err := strconv.Atoi(c.DefaultQuery("page", "1"))
	if err != nil {
		_ = c.AbortWithError(http.StatusBadRequest, err)
		return
	}

	pipelines, err := store.FromContext(c).GetPipelineList(repo, page)
	if err != nil {
		if errors.Is(err, types.RecordNotExist) {
			c.AbortWithStatus(http.StatusNotFound)
			return
		}
		c.AbortWithStatus(http.StatusInternalServerError)
		return
	}
	c.JSON(http.StatusOK, pipelines)
}

func GetPipeline(c *gin.Context) {
	_store := store.FromContext(c)
	if c.Param("number") == "latest" {
		GetPipelineLast(c)
		return
	}

	repo := session.Repo(c)
	num, err := strconv.ParseInt(c.Param("number"), 10, 64)
	if err != nil {
		_ = c.AbortWithError(http.StatusBadRequest, err)
		return
	}

	pl, err := _store.GetPipelineNumber(repo, num)
	if err != nil {
		_ = c.AbortWithError(http.StatusInternalServerError, err)
		return
	}
	files, _ := _store.FileList(pl)
	steps, _ := _store.StepList(pl)
	if pl.Steps, err = model.Tree(steps); err != nil {
		_ = c.AbortWithError(http.StatusInternalServerError, err)
		return
	}
	pl.Files = files

	c.JSON(http.StatusOK, pl)
}

func GetPipelineLast(c *gin.Context) {
	_store := store.FromContext(c)
	repo := session.Repo(c)
	branch := c.DefaultQuery("branch", repo.Branch)

	pl, err := _store.GetPipelineLast(repo, branch)
	if err != nil {
		c.String(http.StatusInternalServerError, err.Error())
		return
	}

	steps, err := _store.StepList(pl)
	if err != nil {
		_ = c.AbortWithError(http.StatusInternalServerError, err)
		return
	}
	if pl.Steps, err = model.Tree(steps); err != nil {
		_ = c.AbortWithError(http.StatusInternalServerError, err)
		return
	}
	c.JSON(http.StatusOK, pl)
}

func GetPipelineLogs(c *gin.Context) {
	_store := store.FromContext(c)
	repo := session.Repo(c)

	// parse the pipeline number and step sequence number from
	// the request parameter.
	num, _ := strconv.ParseInt(c.Params.ByName("number"), 10, 64)
	ppid, _ := strconv.Atoi(c.Params.ByName("pid"))
	name := c.Params.ByName("step")

	pl, err := _store.GetPipelineNumber(repo, num)
	if err != nil {
		_ = c.AbortWithError(404, err)
		return
	}

	step, err := _store.StepChild(pl, ppid, name)
	if err != nil {
		_ = c.AbortWithError(404, err)
		return
	}

	rc, err := _store.LogFind(step)
	if err != nil {
		_ = c.AbortWithError(404, err)
		return
	}

	defer rc.Close()

	c.Header("Content-Type", "application/json")
	if _, err := io.Copy(c.Writer, rc); err != nil {
		log.Error().Err(err).Msg("could not copy log to http response")
	}
}

func GetStepLogs(c *gin.Context) {
	_store := store.FromContext(c)
	repo := session.Repo(c)

	// parse the pipeline number and step sequence number from
	// the request parameter.
	num, _ := strconv.ParseInt(c.Params.ByName("number"), 10, 64)
	pid, _ := strconv.Atoi(c.Params.ByName("pid"))

	pl, err := _store.GetPipelineNumber(repo, num)
	if err != nil {
		_ = c.AbortWithError(http.StatusNotFound, err)
		return
	}

	step, err := _store.StepFind(pl, pid)
	if err != nil {
		_ = c.AbortWithError(http.StatusNotFound, err)
		return
	}

	rc, err := _store.LogFind(step)
	if err != nil {
		_ = c.AbortWithError(http.StatusNotFound, err)
		return
	}

	defer rc.Close()

	c.Header("Content-Type", "application/json")
	if _, err := io.Copy(c.Writer, rc); err != nil {
		log.Error().Err(err).Msg("could not copy log to http response")
	}
}

func GetPipelineConfig(c *gin.Context) {
	_store := store.FromContext(c)
	repo := session.Repo(c)
	num, err := strconv.ParseInt(c.Param("number"), 10, 64)
	if err != nil {
		_ = c.AbortWithError(http.StatusBadRequest, err)
		return
	}

	pl, err := _store.GetPipelineNumber(repo, num)
	if err != nil {
		_ = c.AbortWithError(http.StatusInternalServerError, err)
		return
	}

	configs, err := _store.ConfigsForPipeline(pl.ID)
	if err != nil {
		c.String(http.StatusInternalServerError, err.Error())
		return
	}

	c.JSON(http.StatusOK, configs)
}

// DeletePipeline cancels a pipeline
func DeletePipeline(c *gin.Context) {
	_store := store.FromContext(c)
	repo := session.Repo(c)
	num, _ := strconv.ParseInt(c.Params.ByName("number"), 10, 64)

	pl, err := _store.GetPipelineNumber(repo, num)
	if err != nil {
		_ = c.AbortWithError(http.StatusNotFound, err)
		return
	}

	if err := pipeline.Cancel(c, _store, repo, pl); err != nil {
		handlePipelineErr(c, err)
	} else {
		c.Status(http.StatusNoContent)
	}
}

// PostApproval start pipelines in gated repos
func PostApproval(c *gin.Context) {
	var (
		_store = store.FromContext(c)
		repo   = session.Repo(c)
		user   = session.User(c)
		num, _ = strconv.ParseInt(c.Params.ByName("number"), 10, 64)
	)

	pl, err := _store.GetPipelineNumber(repo, num)
	if err != nil {
		_ = c.AbortWithError(404, err)
		return
	}

	newpipeline, err := pipeline.Approve(c, _store, pl, user, repo)
	if err != nil {
		handlePipelineErr(c, err)
	} else {
		c.JSON(200, newpipeline)
	}
}

// PostDecline decline pipelines in gated repos
func PostDecline(c *gin.Context) {
	var (
		_store = store.FromContext(c)
		repo   = session.Repo(c)
		user   = session.User(c)
		num, _ = strconv.ParseInt(c.Params.ByName("number"), 10, 64)
	)

	pl, err := _store.GetPipelineNumber(repo, num)
	if err != nil {
		c.String(http.StatusNotFound, "%v", err)
		return
	}

	pl, err = pipeline.Decline(c, _store, pl, user, repo)
	if err != nil {
		handlePipelineErr(c, err)
	} else {
		c.JSON(200, pl)
	}
}

func GetPipelineQueue(c *gin.Context) {
	out, err := store.FromContext(c).GetPipelineQueue()
	if err != nil {
		c.String(500, "Error getting pipeline queue. %s", err)
		return
	}
	c.JSON(200, out)
}

// PostPipeline restarts a pipeline optional with altered event, deploy or environment
func PostPipeline(c *gin.Context) {
	_store := store.FromContext(c)
	repo := session.Repo(c)

	num, err := strconv.ParseInt(c.Param("number"), 10, 64)
	if err != nil {
		_ = c.AbortWithError(http.StatusBadRequest, err)
		return
	}

	user, err := _store.GetUser(repo.UserID)
	if err != nil {
		log.Error().Msgf("failure to find repo owner %s. %s", repo.FullName, err)
		_ = c.AbortWithError(500, err)
		return
	}

	pl, err := _store.GetPipelineNumber(repo, num)
	if err != nil {
		log.Error().Msgf("failure to get pipeline %d. %s", num, err)
		_ = c.AbortWithError(404, err)
		return
	}

	// refresh the token to make sure, pipeline.ReStart can still obtain the pipeline config if nessessary again
	refreshUserToken(c, user)

	// make Deploy overridable
	pl.Deploy = c.DefaultQuery("deploy_to", pl.Deploy)

	// make Event overridable
	if event, ok := c.GetQuery("event"); ok {
		pl.Event = model.WebhookEvent(event)

		if !model.ValidateWebhookEvent(pl.Event) {
			msg := fmt.Sprintf("pipeline event '%s' is invalid", event)
			c.String(http.StatusBadRequest, msg)
			return
		}
	}

	// Read query string parameters into pipelineParams, exclude reserved params
	envs := map[string]string{}
	for key, val := range c.Request.URL.Query() {
		switch key {
		// Skip some options of the endpoint
		case "fork", "event", "deploy_to":
			continue
		default:
			// We only accept string literals, because pipeline parameters will be
			// injected as environment variables
			// TODO: sanitize the value
			envs[key] = val[0]
		}
	}

	newpipeline, err := pipeline.Restart(c, _store, pl, user, repo, envs)
	if err != nil {
		handlePipelineErr(c, err)
	} else {
		c.JSON(200, newpipeline)
	}
}

func DeletePipelineLogs(c *gin.Context) {
	_store := store.FromContext(c)

	repo := session.Repo(c)
	user := session.User(c)
	num, _ := strconv.ParseInt(c.Params.ByName("number"), 10, 64)

	pl, err := _store.GetPipelineNumber(repo, num)
	if err != nil {
		_ = c.AbortWithError(404, err)
		return
	}

	steps, err := _store.StepList(pl)
	if err != nil {
		_ = c.AbortWithError(404, err)
		return
	}

	switch pl.Status {
	case model.StatusRunning, model.StatusPending:
		c.String(400, "Cannot delete logs for a pending or running pipeline")
		return
	}

	for _, step := range steps {
		t := time.Now().UTC()
		buf := bytes.NewBufferString(fmt.Sprintf(deleteStr, step.Name, user.Login, t.Format(time.UnixDate)))
		lerr := _store.LogSave(step, buf)
		if lerr != nil {
			err = lerr
		}
	}
	if err != nil {
		c.String(400, "There was a problem deleting your logs. %s", err)
		return
	}

	c.String(204, "")
}

var deleteStr = `[
	{
		"step": %q,
		"pos": 0,
		"out": "logs purged by %s on %s\n"
	}
]`