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// SPDX-FileCopyrightText: 2025 Shota FUJI <pockawoooh@gmail.com>
// SPDX-License-Identifier: AGPL-3.0-only

package core

import (
	"crypto/rand"
	"database/sql"
	"log/slog"

	"pocka.jp/x/yamori/backend/core/event"
	"pocka.jp/x/yamori/backend/core/projection"
	workspaceEvent "pocka.jp/x/yamori/backend/events/workspace"
	"pocka.jp/x/yamori/backend/migrations"
	eventsV1 "pocka.jp/x/yamori/proto/go/backend/events/v1"
)

type Core struct {
	DB *sql.DB

	Logger *slog.Logger
}

func New(db *sql.DB, logger *slog.Logger) (*Core, error) {
	err := migrations.Run(db, logger, []migrations.Migration{
		migrations.Migration001{},
	})
	if err != nil {
		return nil, err
	}

	return &Core{
		DB:     db,
		Logger: logger,
	}, nil
}

func (core *Core) Init(adminCreationPassword string, overwriteJwtSecret bool) error {
	if err := core.generateAdminCreationPassword(adminCreationPassword); err != nil {
		return err
	}

	if err := core.setupLoginJwtSecret(overwriteJwtSecret); err != nil {
		return err
	}

	return nil
}

func (core *Core) generateAdminCreationPassword(givenPassword string) error {
	tx, err := core.DB.Begin()
	if err != nil {
		return err
	}
	defer tx.Rollback()

	pw, err := projection.GetAdminCreationPassword(tx)
	if err != nil {
		return err
	}

	workspace, err := projection.GetWorkspace(tx)
	if err != nil {
		return err
	}

	if err := event.UpdateProjections(tx, pw, workspace); err != nil {
		return err
	}

	if pw.Projection.Password != nil {
		return nil
	}

	if workspace.Projection.NumberOfAdmins != nil && *workspace.Projection.NumberOfAdmins > 0 {
		return nil
	}

	core.Logger.Debug("Configuring admin creation password...")

	password := givenPassword
	isPasswordAutogenerated := false
	if password == "" {
		password = rand.Text()
		isPasswordAutogenerated = true
	}

	err = event.AppendEvents(tx, []*eventsV1.Event{
		workspaceEvent.GenerateAdminCreationPassword(password),
	})
	if err != nil {
		return err
	}

	if err := tx.Commit(); err != nil {
		return err
	}

	if isPasswordAutogenerated {
		core.Logger.Info(
			"Generated admin creation password. Use this for initial admin user creation.",
			"admin_creation_password",
			password,
		)
	} else {
		core.Logger.Info("Configured admin creation password. Use that for initial admin user creation.")
	}

	return nil
}

func (core *Core) setupLoginJwtSecret(overwrite bool) error {
	tx, err := core.DB.Begin()
	if err != nil {
		return err
	}
	defer tx.Rollback()

	p, err := projection.GetLoginJwtSecret(tx)
	if err != nil {
		return err
	}

	if p.HasSnapshot() {
		if overwrite {
			core.Logger.Warn(
				"Overwriting existing JWT secret. Tokens generated before won't be available anymore.",
			)
		} else {
			core.Logger.Debug("Found JWT secret, skipping newly generating.")
			return nil
		}
	}

	err = event.AppendEvents(tx, []*eventsV1.Event{
		workspaceEvent.ConfigureRandomLoginJwtSecret(),
	})
	if err != nil {
		return err
	}

	if err := tx.Commit(); err != nil {
		return err
	}

	core.Logger.Info(
		"Generated a new secret for signing JWT.",
	)

	return nil
}