// Copyright 2022 Woodpecker Authors
// 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.

package main

import (
	"context"
	"encoding/base32"
	"errors"
	"fmt"
	"net/url"
	"os"
	"strings"
	"time"

	"github.com/gorilla/securecookie"
	"github.com/prometheus/client_golang/prometheus"
	prometheus_auto "github.com/prometheus/client_golang/prometheus/promauto"
	"github.com/rs/zerolog/log"
	"github.com/urfave/cli/v2"
	"golang.org/x/sync/errgroup"

	"go.woodpecker-ci.org/woodpecker/v2/server"
	"go.woodpecker-ci.org/woodpecker/v2/server/cache"
	"go.woodpecker-ci.org/woodpecker/v2/server/forge/setup"
	"go.woodpecker-ci.org/woodpecker/v2/server/logging"
	"go.woodpecker-ci.org/woodpecker/v2/server/model"
	"go.woodpecker-ci.org/woodpecker/v2/server/pubsub"
	"go.woodpecker-ci.org/woodpecker/v2/server/queue"
	"go.woodpecker-ci.org/woodpecker/v2/server/services"
	logService "go.woodpecker-ci.org/woodpecker/v2/server/services/log"
	"go.woodpecker-ci.org/woodpecker/v2/server/services/log/file"
	"go.woodpecker-ci.org/woodpecker/v2/server/services/permissions"
	"go.woodpecker-ci.org/woodpecker/v2/server/store"
	"go.woodpecker-ci.org/woodpecker/v2/server/store/datastore"
	"go.woodpecker-ci.org/woodpecker/v2/server/store/types"
	"go.woodpecker-ci.org/woodpecker/v2/shared/constant"
)

func setupStore(c *cli.Context) (store.Store, error) {
	datasource := c.String("datasource")
	driver := c.String("driver")
	xorm := store.XORM{
		Log:     c.Bool("log-xorm"),
		ShowSQL: c.Bool("log-xorm-sql"),
	}

	if driver == "sqlite3" {
		if datastore.SupportedDriver("sqlite3") {
			log.Debug().Msg("server has sqlite3 support")
		} else {
			log.Debug().Msg("server was built without sqlite3 support!")
		}
	}

	if !datastore.SupportedDriver(driver) {
		return nil, fmt.Errorf("database driver '%s' not supported", driver)
	}

	if driver == "sqlite3" {
		if err := checkSqliteFileExist(datasource); err != nil {
			return nil, fmt.Errorf("check sqlite file: %w", err)
		}
	}

	opts := &store.Opts{
		Driver: driver,
		Config: datasource,
		XORM:   xorm,
	}
	log.Trace().Msgf("setup datastore: %#v", *opts)
	store, err := datastore.NewEngine(opts)
	if err != nil {
		return nil, fmt.Errorf("could not open datastore: %w", err)
	}

	if err := store.Migrate(c.Bool("migrations-allow-long")); err != nil {
		return nil, fmt.Errorf("could not migrate datastore: %w", err)
	}

	return store, nil
}

func checkSqliteFileExist(path string) error {
	_, err := os.Stat(path)
	if err != nil && os.IsNotExist(err) {
		log.Warn().Msgf("no sqlite3 file found, will create one at '%s'", path)
		return nil
	}
	return err
}

func setupQueue(c *cli.Context, s store.Store) queue.Queue {
	return queue.WithTaskStore(queue.New(c.Context), s)
}

func setupMembershipService(_ *cli.Context, _store store.Store) cache.MembershipService {
	return cache.NewMembershipService(_store)
}

func setupMetrics(g *errgroup.Group, _store store.Store) {
	pendingSteps := prometheus_auto.NewGauge(prometheus.GaugeOpts{
		Namespace: "woodpecker",
		Name:      "pending_steps",
		Help:      "Total number of pending pipeline steps.",
	})
	waitingSteps := prometheus_auto.NewGauge(prometheus.GaugeOpts{
		Namespace: "woodpecker",
		Name:      "waiting_steps",
		Help:      "Total number of pipeline waiting on deps.",
	})
	runningSteps := prometheus_auto.NewGauge(prometheus.GaugeOpts{
		Namespace: "woodpecker",
		Name:      "running_steps",
		Help:      "Total number of running pipeline steps.",
	})
	workers := prometheus_auto.NewGauge(prometheus.GaugeOpts{
		Namespace: "woodpecker",
		Name:      "worker_count",
		Help:      "Total number of workers.",
	})
	pipelines := prometheus_auto.NewGauge(prometheus.GaugeOpts{
		Namespace: "woodpecker",
		Name:      "pipeline_total_count",
		Help:      "Total number of pipelines.",
	})
	users := prometheus_auto.NewGauge(prometheus.GaugeOpts{
		Namespace: "woodpecker",
		Name:      "user_count",
		Help:      "Total number of users.",
	})
	repos := prometheus_auto.NewGauge(prometheus.GaugeOpts{
		Namespace: "woodpecker",
		Name:      "repo_count",
		Help:      "Total number of repos.",
	})

	g.Go(func() error {
		for {
			stats := server.Config.Services.Queue.Info(context.TODO())
			pendingSteps.Set(float64(stats.Stats.Pending))
			waitingSteps.Set(float64(stats.Stats.WaitingOnDeps))
			runningSteps.Set(float64(stats.Stats.Running))
			workers.Set(float64(stats.Stats.Workers))
			time.Sleep(500 * time.Millisecond)
		}
	})
	g.Go(func() error {
		for {
			repoCount, _ := _store.GetRepoCount()
			userCount, _ := _store.GetUserCount()
			pipelineCount, _ := _store.GetPipelineCount()
			pipelines.Set(float64(pipelineCount))
			users.Set(float64(userCount))
			repos.Set(float64(repoCount))
			time.Sleep(10 * time.Second)
		}
	})
}

func setupLogStore(c *cli.Context, s store.Store) (logService.Service, error) {
	switch c.String("log-store") {
	case "file":
		return file.NewLogStore(c.String("log-store-file-path"))
	default:
		return s, nil
	}
}

const jwtSecretID = "jwt-secret"

func setupJWTSecret(_store store.Store) (string, error) {
	jwtSecret, err := _store.ServerConfigGet(jwtSecretID)
	if errors.Is(err, types.RecordNotExist) {
		jwtSecret := base32.StdEncoding.EncodeToString(
			securecookie.GenerateRandomKey(32),
		)
		err = _store.ServerConfigSet(jwtSecretID, jwtSecret)
		if err != nil {
			return "", err
		}
		log.Debug().Msg("created jwt secret")
		return jwtSecret, nil
	}

	if err != nil {
		return "", err
	}

	return jwtSecret, nil
}

func setupEvilGlobals(c *cli.Context, s store.Store) error {
	// services
	server.Config.Services.Queue = setupQueue(c, s)
	server.Config.Services.Logs = logging.New()
	server.Config.Services.Pubsub = pubsub.New()
	server.Config.Services.Membership = setupMembershipService(c, s)
	serviceManager, err := services.NewManager(c, s, setup.Forge)
	if err != nil {
		return fmt.Errorf("could not setup service manager: %w", err)
	}
	server.Config.Services.Manager = serviceManager

	server.Config.Services.LogStore, err = setupLogStore(c, s)
	if err != nil {
		return fmt.Errorf("could not setup log store: %w", err)
	}

	// authentication
	server.Config.Pipeline.AuthenticatePublicRepos = c.Bool("authenticate-public-repos")

	// Cloning
	server.Config.Pipeline.DefaultCloneImage = c.String("default-clone-image")
	constant.TrustedCloneImages = append(constant.TrustedCloneImages, server.Config.Pipeline.DefaultCloneImage)

	// Execution
	_events := c.StringSlice("default-cancel-previous-pipeline-events")
	events := make([]model.WebhookEvent, 0, len(_events))
	for _, v := range _events {
		events = append(events, model.WebhookEvent(v))
	}
	server.Config.Pipeline.DefaultCancelPreviousPipelineEvents = events
	server.Config.Pipeline.DefaultTimeout = c.Int64("default-pipeline-timeout")
	server.Config.Pipeline.MaxTimeout = c.Int64("max-pipeline-timeout")

	// limits
	server.Config.Pipeline.Limits.MemSwapLimit = c.Int64("limit-mem-swap")
	server.Config.Pipeline.Limits.MemLimit = c.Int64("limit-mem")
	server.Config.Pipeline.Limits.ShmSize = c.Int64("limit-shm-size")
	server.Config.Pipeline.Limits.CPUQuota = c.Int64("limit-cpu-quota")
	server.Config.Pipeline.Limits.CPUShares = c.Int64("limit-cpu-shares")
	server.Config.Pipeline.Limits.CPUSet = c.String("limit-cpu-set")

	// backend options for pipeline compiler
	server.Config.Pipeline.Proxy.No = c.String("backend-no-proxy")
	server.Config.Pipeline.Proxy.HTTP = c.String("backend-http-proxy")
	server.Config.Pipeline.Proxy.HTTPS = c.String("backend-https-proxy")

	// server configuration
	server.Config.Server.JWTSecret, err = setupJWTSecret(s)
	if err != nil {
		return fmt.Errorf("could not setup jwt secret: %w", err)
	}
	server.Config.Server.Cert = c.String("server-cert")
	server.Config.Server.Key = c.String("server-key")
	server.Config.Server.AgentToken = c.String("agent-secret")
	serverHost := strings.TrimSuffix(c.String("server-host"), "/")
	server.Config.Server.Host = serverHost
	if c.IsSet("server-webhook-host") {
		server.Config.Server.WebhookHost = c.String("server-webhook-host")
	} else {
		server.Config.Server.WebhookHost = serverHost
	}
	if c.IsSet("server-dev-oauth-host-deprecated") {
		server.Config.Server.OAuthHost = c.String("server-dev-oauth-host-deprecated")
	} else {
		server.Config.Server.OAuthHost = serverHost
	}
	server.Config.Server.Port = c.String("server-addr")
	server.Config.Server.PortTLS = c.String("server-addr-tls")
	server.Config.Server.StatusContext = c.String("status-context")
	server.Config.Server.StatusContextFormat = c.String("status-context-format")
	server.Config.Server.SessionExpires = c.Duration("session-expires")
	u, _ := url.Parse(server.Config.Server.Host)
	rootPath := strings.TrimSuffix(u.Path, "/")
	if rootPath != "" && !strings.HasPrefix(rootPath, "/") {
		rootPath = "/" + rootPath
	}
	server.Config.Server.RootPath = rootPath
	server.Config.Server.CustomCSSFile = strings.TrimSpace(c.String("custom-css-file"))
	server.Config.Server.CustomJsFile = strings.TrimSpace(c.String("custom-js-file"))
	server.Config.Pipeline.Networks = c.StringSlice("network")
	server.Config.Pipeline.Volumes = c.StringSlice("volume")
	server.Config.Pipeline.Privileged = c.StringSlice("escalate")
	server.Config.WebUI.EnableSwagger = c.Bool("enable-swagger")
	server.Config.WebUI.SkipVersionCheck = c.Bool("skip-version-check")

	// prometheus
	server.Config.Prometheus.AuthToken = c.String("prometheus-auth-token")

	// permissions
	server.Config.Permissions.Open = c.Bool("open")
	server.Config.Permissions.Admins = permissions.NewAdmins(c.StringSlice("admin"))
	server.Config.Permissions.Orgs = permissions.NewOrgs(c.StringSlice("orgs"))
	server.Config.Permissions.OwnersAllowlist = permissions.NewOwnersAllowlist(c.StringSlice("repo-owners"))
	return nil
}