package admintools

import (
	"context"
	"errors"
	"fmt"
	"net"
	"os"
	"strconv"
	"time"

	"git.handmade.network/hmn/hmn/src/auth"
	"git.handmade.network/hmn/hmn/src/db"
	"git.handmade.network/hmn/hmn/src/email"
	"git.handmade.network/hmn/hmn/src/logging"
	"git.handmade.network/hmn/hmn/src/models"
	"git.handmade.network/hmn/hmn/src/oops"
	"git.handmade.network/hmn/hmn/src/perf"
	"git.handmade.network/hmn/hmn/src/templates"
	"git.handmade.network/hmn/hmn/src/website"
	"github.com/google/uuid"
	"github.com/jackc/pgx/v5"
	"github.com/spf13/cobra"
)

func init() {
	adminCommand := &cobra.Command{
		Use:   "admin",
		Short: "Miscellaneous admin commands",
	}
	website.WebsiteCommand.AddCommand(adminCommand)

	setPasswordCommand := &cobra.Command{
		Use:   "setpassword [username] [new password]",
		Short: "Replace a user's password",
		Run: func(cmd *cobra.Command, args []string) {
			if len(args) < 2 {
				fmt.Printf("You must provide a username and a password.\n\n")
				cmd.Usage()
				os.Exit(1)
			}

			username := args[0]
			password := args[1]

			ctx := context.Background()
			conn := db.NewConn()
			defer conn.Close(ctx)

			row := conn.QueryRow(ctx, "SELECT id, username FROM hmn_user WHERE lower(username) = lower($1)", username)
			var id int
			var canonicalUsername string
			err := row.Scan(&id, &canonicalUsername)
			if err != nil {
				if errors.Is(err, pgx.ErrNoRows) {
					fmt.Printf("User '%s' not found\n", username)
					os.Exit(1)
				} else {
					panic(err)
				}
			}

			hashedPassword := auth.HashPassword(password)

			err = auth.UpdatePassword(ctx, conn, canonicalUsername, hashedPassword)
			if err != nil {
				panic(err)
			}

			fmt.Printf("Successfully updated password for '%s'\n", canonicalUsername)
		},
	}
	adminCommand.AddCommand(setPasswordCommand)

	activateUserCommand := &cobra.Command{
		Use:   "activateuser [username]",
		Short: "Activates a user manually",
		Run: func(cmd *cobra.Command, args []string) {
			if len(args) < 1 {
				fmt.Printf("You must provide a username.\n\n")
				cmd.Usage()
				os.Exit(1)
			}

			username := args[0]

			ctx := context.Background()
			conn := db.NewConn()
			defer conn.Close(ctx)

			res, err := conn.Exec(ctx, "UPDATE hmn_user SET status = $1 WHERE LOWER(username) = LOWER($2);", models.UserStatusConfirmed, username)
			if err != nil {
				panic(err)
			}
			if res.RowsAffected() == 0 {
				fmt.Printf("User not found.\n\n")
			}

			fmt.Printf("User has been successfully activated.\n\n")
		},
	}
	adminCommand.AddCommand(activateUserCommand)

	createUserCommand := &cobra.Command{
		Use:   "createuser [username]",
		Short: "Creates a new user and sets their status to 'Email confirmed'",
		Run: func(cmd *cobra.Command, args []string) {
			if len(args) < 1 {
				fmt.Printf("You must provide a username.\n\n")
				cmd.Usage()
				os.Exit(1)
			}

			username := args[0]
			password := "password"

			ctx := context.Background()
			conn := db.NewConn()
			defer conn.Close(ctx)

			userAlreadyExists := true
			_, err := db.QueryOneScalar[int](ctx, conn,
				`
				SELECT id
				FROM hmn_user
				WHERE LOWER(username) = LOWER($1)
				`,
				username,
			)
			if err != nil {
				if errors.Is(err, db.NotFound) {
					userAlreadyExists = false
				} else {
					panic(err)
				}
			}

			if userAlreadyExists {
				fmt.Printf("%s already exists. Please pick a different username.\n\n", username)
				os.Exit(1)
			}

			email := uuid.New().String() + "@example.com"
			hashedPassword := auth.HashPassword(password)

			var newUserId int
			err = conn.QueryRow(ctx,
				`
				INSERT INTO hmn_user (username, email, password, date_joined, registration_ip, status)
				VALUES ($1, $2, $3, $4, $5, $6)
				RETURNING id
				`,
				username,
				email,
				hashedPassword.String(),
				time.Now(),
				net.ParseIP("127.0.0.1"),
				models.UserStatusConfirmed,
			).Scan(&newUserId)
			if err != nil {
				panic(err)
			}

			fmt.Printf("New user added!\nID: %d\nUsername: %s\nPassword: %s\n", newUserId, username, password)
			fmt.Printf("You can change the user's status with the 'userstatus' command as follows:\n")
			fmt.Printf("userstatus %s approved\n", username)
			fmt.Printf("Or set the user as admin with the following command:\n")
			fmt.Printf("usersetadmin %s true\n", username)
		},
	}
	adminCommand.AddCommand(createUserCommand)

	userSetAdminCommand := &cobra.Command{
		Use:   "usersetadmin [username] [true/false]",
		Short: "Toggle the user's admin privileges",
		Run: func(cmd *cobra.Command, args []string) {
			if len(args) < 2 {
				fmt.Printf("You must provide a username and 'true' or 'false'.\n\n")
				cmd.Usage()
				os.Exit(1)
			}

			username := args[0]
			toggleStr := args[1]
			makeAdmin := false
			if toggleStr == "true" {
				makeAdmin = true
			}

			ctx := context.Background()
			conn := db.NewConn()
			defer conn.Close(ctx)

			res, err := conn.Exec(ctx,
				`
				UPDATE hmn_user
				SET is_staff = $1
				WHERE LOWER(username) = LOWER($2)
				`,
				makeAdmin,
				username,
			)
			if err != nil {
				panic(err)
			}
			if res.RowsAffected() == 0 {
				fmt.Printf("User not found.\n\n")
			} else {
				fmt.Printf("Successfully set %s's is_staff to %v\n\n", username, makeAdmin)
			}
		},
	}
	adminCommand.AddCommand(userSetAdminCommand)

	userStatusCommand := &cobra.Command{
		Use:   "userstatus [username] [status]",
		Short: "Set a user's status manually",
		Run: func(cmd *cobra.Command, args []string) {
			if len(args) < 2 {
				fmt.Printf("You must provide a username and status.\n\n")
				fmt.Printf("Statuses:\n")
				fmt.Printf("1. inactive:\n")
				fmt.Printf("2. confirmed:\n")
				fmt.Printf("3. approved:\n")
				fmt.Printf("4. banned:\n")
				cmd.Usage()
				os.Exit(1)
			}

			username := args[0]
			statusStr := args[1]
			status := models.UserStatusInactive
			switch statusStr {
			case "inactive":
				status = models.UserStatusInactive
			case "confirmed":
				status = models.UserStatusConfirmed
			case "approved":
				status = models.UserStatusApproved
			case "banned":
				status = models.UserStatusBanned
			default:
				fmt.Printf("You must provide a valid status\n\n")
				fmt.Printf("Statuses:\n")
				fmt.Printf("1. inactive:\n")
				fmt.Printf("2. confirmed:\n")
				fmt.Printf("3. approved:\n")
				fmt.Printf("4. banned:\n")
				cmd.Usage()
				os.Exit(1)
			}

			ctx := context.Background()
			conn := db.NewConn()
			defer conn.Close(ctx)

			res, err := conn.Exec(ctx, "UPDATE hmn_user SET status = $1 WHERE LOWER(username) = LOWER($2);", status, username)
			if err != nil {
				panic(err)
			}
			if res.RowsAffected() == 0 {
				fmt.Printf("User not found.\n\n")
			}

			fmt.Printf("%s is now %s\n\n", username, statusStr)
		},
	}
	adminCommand.AddCommand(userStatusCommand)

	sendTestMailCommand := &cobra.Command{
		Use:   "sendtestmail [type] [toAddress] [toName]",
		Short: "Sends a test mail",
		Run: func(cmd *cobra.Command, args []string) {
			templates.Init()
			if len(args) < 3 {
				fmt.Printf("You must provide the email type and recipient details.\n\n")
				cmd.Usage()
				os.Exit(1)
			}

			emailType := args[0]
			toAddress := args[1]
			toName := args[2]

			p := perf.MakeNewRequestPerf("admintools", "email test", emailType)
			var err error
			switch emailType {
			case "registration":
				err = email.SendRegistrationEmail(toAddress, toName, "test_user", "test_token", "", p)
			case "passwordreset":
				err = email.SendPasswordReset(toAddress, toName, "test_user", "test_token", time.Now().Add(time.Hour*24), p)
			default:
				fmt.Printf("You must provide a valid email type\n\n")
				cmd.Usage()
				os.Exit(1)
			}
			p.EndRequest()
			perf.LogPerf(p, logging.Info())
			if err != nil {
				panic(oops.New(err, "Failed to send test email"))
			}
		},
	}
	adminCommand.AddCommand(sendTestMailCommand)

	createSubforumCommand := &cobra.Command{
		Use:   "createsubforum",
		Short: "Create a new subforum",
		Run: func(cmd *cobra.Command, args []string) {
			name, _ := cmd.Flags().GetString("name")
			slug, _ := cmd.Flags().GetString("slug")
			blurb, _ := cmd.Flags().GetString("blurb")
			parentSlug, _ := cmd.Flags().GetString("parent_slug")
			projectSlug, _ := cmd.Flags().GetString("project_slug")

			ctx := context.Background()
			conn := db.NewConn()
			defer conn.Close(ctx)

			tx, err := conn.Begin(ctx)
			if err != nil {
				panic(err)
			}
			defer tx.Rollback(ctx)

			projectId, err := db.QueryOneScalar[int](ctx, tx, `SELECT id FROM project WHERE slug = $1`, projectSlug)
			if err != nil {
				panic(err)
			}

			var parentId *int
			if parentSlug == "" {
				// Select the root subforum
				id, err := db.QueryOneScalar[int](ctx, tx,
					`SELECT id FROM subforum WHERE parent_id IS NULL AND project_id = $1`,
					projectId,
				)
				if err != nil {
					panic(err)
				}
				parentId = &id
			} else {
				// Select the parent
				id, err := db.QueryOneScalar[int](ctx, tx,
					`SELECT id FROM subforum WHERE slug = $1 AND project_id = $2`,
					parentSlug, projectId,
				)
				if err != nil {
					panic(err)
				}
				parentId = &id
			}

			newId, err := db.QueryOneScalar[int](ctx, tx,
				`
				INSERT INTO subforum (name, slug, blurb, parent_id, project_id)
				VALUES ($1, $2, $3, $4, $5)
				RETURNING id
				`,
				name,
				slug,
				blurb,
				parentId,
				projectId,
			)
			if err != nil {
				panic(err)
			}

			err = tx.Commit(ctx)
			if err != nil {
				panic(err)
			}

			fmt.Printf("Created new subforum with id: %d\n", newId)
		},
	}
	createSubforumCommand.Flags().String("name", "", "")
	createSubforumCommand.Flags().String("slug", "", "")
	createSubforumCommand.Flags().String("blurb", "", "")
	createSubforumCommand.Flags().String("parent_slug", "", "")
	createSubforumCommand.Flags().String("project_slug", "", "")
	createSubforumCommand.MarkFlagRequired("name")
	createSubforumCommand.MarkFlagRequired("slug")
	createSubforumCommand.MarkFlagRequired("project_slug")
	adminCommand.AddCommand(createSubforumCommand)

	moveThreadsToSubforumCommand := &cobra.Command{
		Use:   "movethreadstosubforum [<thread id>...]",
		Short: "Move threads to a subforum, changing their type if necessary",
		Run: func(cmd *cobra.Command, args []string) {
			projectSlug, _ := cmd.Flags().GetString("project_slug")
			subforumSlug, _ := cmd.Flags().GetString("subforum_slug")

			ctx := context.Background()
			conn := db.NewConn()
			defer conn.Close(ctx)

			tx, err := conn.Begin(ctx)
			if err != nil {
				panic(err)
			}
			defer tx.Rollback(ctx)

			projectId, err := db.QueryOneScalar[int](ctx, tx, `SELECT id FROM project WHERE slug = $1`, projectSlug)
			if err != nil {
				panic(err)
			}

			subforumId, err := db.QueryOneScalar[int](ctx, tx,
				`SELECT id FROM subforum WHERE slug = $1 AND project_id = $2`,
				subforumSlug, projectId,
			)
			if err != nil {
				panic(err)
			}

			var threadIds []int
			for _, threadIdStr := range args {
				threadId, err := strconv.Atoi(threadIdStr)
				if err != nil {
					fmt.Printf("Couldn't move thread '%s': couldn't parse ID\n", threadIdStr)
					continue
				}
				threadIds = append(threadIds, threadId)
			}

			threadsTag, err := tx.Exec(ctx,
				`
				UPDATE thread
				SET
					project_id = $2,
					subforum_id = $3,
					personal_article_user_id = NULL,
					type = 2
				WHERE
					id = ANY ($1)
				`,
				threadIds,
				projectId,
				subforumId,
			)

			postsTag, err := tx.Exec(ctx,
				`
				UPDATE post
				SET
					thread_type = 2
				WHERE
					thread_id = ANY ($1)
				`,
				threadIds,
			)

			err = tx.Commit(ctx)
			if err != nil {
				panic(err)
			}

			fmt.Printf("Successfully moved %d threads (and %d posts).\n", threadsTag.RowsAffected(), postsTag.RowsAffected())
		},
	}
	moveThreadsToSubforumCommand.Flags().String("project_slug", "", "")
	moveThreadsToSubforumCommand.Flags().String("subforum_slug", "", "")
	moveThreadsToSubforumCommand.MarkFlagRequired("project_slug")
	moveThreadsToSubforumCommand.MarkFlagRequired("subforum_slug")
	adminCommand.AddCommand(moveThreadsToSubforumCommand)

	fixupSnippetAssociation := &cobra.Command{
		Use:   "fixupsnippets",
		Short: "Associates tagged snippets with the right projects",
		Run: func(cmd *cobra.Command, args []string) {
			ctx := context.Background()
			conn := db.NewConn()
			defer conn.Close(ctx)

			type snippetProject struct {
				SnippetID int `db:"snippet_tag.snippet_id"`
				ProjectID int `db:"project.id"`
			}
			res, err := db.Query[snippetProject](ctx, conn,
				`
				SELECT $columns
				FROM snippet_tag
				JOIN project ON project.tag = snippet_tag.tag_id
				`,
			)
			if err != nil {
				panic(err)
			}
			for _, sp := range res {
				_, err = conn.Exec(ctx,
					`
					INSERT INTO snippet_project (snippet_id, project_id, kind)
					VALUES ($1, $2, $3)
					ON CONFLICT DO NOTHING;
					`,
					sp.SnippetID,
					sp.ProjectID,
					models.SnippetProjectKindDiscord,
				)
				if err != nil {
					panic(err)
				}
			}

			fmt.Printf("Done!\n")
		},
	}
	adminCommand.AddCommand(fixupSnippetAssociation)

	addProjectCommands(adminCommand)
}