package migrate

import (
	"fmt"
	"path/filepath"
	"testing"

	"github.com/spf13/cobra"

	"git.avsdev.uk/Go/job-search/internal/cli"
	"git.avsdev.uk/Go/job-search/internal/cli/cmdtest"
	"git.avsdev.uk/Go/job-search/internal/store"
)

// Run with: go test -tags sqlite_fts5 ./...
//
// These tests run the migrate commands as a user would, through a root
// command like job-search's (see cmdtest).

// dbConfig is a config.yaml with a database in the test's directory.
const dbConfig = "logging:\n  level: info\ndatabase:\n  file: ./test.db\n"

func newRoot() *cobra.Command {
	opts := &cli.Options{}
	return cmdtest.NewRoot(opts, NewCommand(opts))
}

func run(t *testing.T, stdin string, args ...string) (string, error) {
	t.Helper()
	return cmdtest.Run(t, newRoot, stdin, args...)
}

func mustRun(t *testing.T, args ...string) string {
	t.Helper()
	return cmdtest.MustRun(t, newRoot, args...)
}

// latestVersion is the schema version of this build's newest migration.
func latestVersion(t *testing.T) int64 {
	t.Helper()
	db, err := store.OpenDB(filepath.Join(t.TempDir(), "version.db"))
	if err != nil {
		t.Fatal(err)
	}
	defer db.Close()
	m, err := store.NewMigrator(db)
	if err != nil {
		t.Fatal(err)
	}
	return store.LatestVersion(m)
}

func TestMigrateUpCreateThenStatus(t *testing.T) {
	cmdtest.Setup(t, dbConfig)
	latest := latestVersion(t)

	out := mustRun(t, "migrate", "up", "--create")
	cmdtest.Contains(t, out,
		"applied   00001_create_opportunities_table.sql",
		fmt.Sprintf("Database migrated to version %d", latest),
	)
	if !cmdtest.Exists("test.db") {
		t.Fatal("test.db was not created")
	}

	out = mustRun(t, "migrate", "status")
	cmdtest.Contains(t, out,
		fmt.Sprintf("Database version %d of %d (up-to-date)", latest, latest),
		"00001_create_opportunities_table.sql",
	)

	out = mustRun(t, "migrate", "up")
	cmdtest.Contains(t, out, "No changes made to database (up-to-date)")
}

// Plain "migrate" is "migrate up" with every pending migration.
func TestMigrateWithoutSubcommand(t *testing.T) {
	cmdtest.Setup(t, dbConfig)
	cmdtest.WriteFile(t, "test.db", "") // exists, so no question is asked

	out := mustRun(t, "migrate")
	cmdtest.Contains(t, out, fmt.Sprintf("Database migrated to version %d", latestVersion(t)))
}

func TestMigrateUpAsksBeforeCreating(t *testing.T) {
	cmdtest.Setup(t, dbConfig)

	out, err := run(t, "n\n", "migrate", "up")
	cmdtest.ErrContains(t, err, "no database file")
	cmdtest.Contains(t, out,
		"Database file './test.db' does not exist. Would you like to create it?")
	if cmdtest.Exists("test.db") {
		t.Error("test.db was created after answering no")
	}

	out, err = run(t, "y\n", "migrate", "up")
	if err != nil {
		t.Fatalf("answering yes: %v\n%s", err, out)
	}
	if !cmdtest.Exists("test.db") {
		t.Error("test.db was not created after answering yes")
	}
}

func TestMigrateUpBySteps(t *testing.T) {
	cmdtest.Setup(t, dbConfig)
	latest := latestVersion(t)

	out := mustRun(t, "migrate", "up", "--create", "--steps", "2")
	cmdtest.Contains(t, out, "Database migrated to version 2")

	out = mustRun(t, "migrate", "status")
	cmdtest.Contains(t, out,
		fmt.Sprintf("Database version 2 of %d (%d pending)", latest, latest-2))
}

func TestMigrateDown(t *testing.T) {
	cmdtest.Setup(t, dbConfig)
	latest := latestVersion(t)
	mustRun(t, "migrate", "up", "--create")

	out := mustRun(t, "migrate", "down", "--steps", "1")
	cmdtest.Contains(t, out, "reverted", fmt.Sprintf("Database migrated to version %d", latest-1))

	// Rolling back everything deletes all data, so it must be confirmed.
	for _, args := range [][]string{
		{"migrate", "down", "--steps", "0"},
		{"migrate", "down", "--steps", "99"},
	} {
		_, err := run(t, "", args...)
		cmdtest.ErrContains(t, err, "pass the --yes flag")
	}
	cmdtest.Contains(t, mustRun(t, "migrate", "status"),
		fmt.Sprintf("Database version %d of %d", latest-1, latest))

	out = mustRun(t, "migrate", "down", "--steps", "0", "--yes")
	cmdtest.Contains(t, out, "Database cleared")

	out = mustRun(t, "migrate", "down", "--steps", "1")
	cmdtest.Contains(t, out, "No changes made to database (empty)")
}

func TestMigrateDownRequiresSteps(t *testing.T) {
	cmdtest.Setup(t, dbConfig)
	mustRun(t, "migrate", "up", "--create")
	_, err := run(t, "", "migrate", "down")
	cmdtest.ErrContains(t, err, "steps")
}

func TestMigrateMissingDatabase(t *testing.T) {
	cmdtest.Setup(t, dbConfig)
	for _, args := range [][]string{
		{"migrate", "status"},
		{"migrate", "down", "--steps", "1"},
	} {
		_, err := run(t, "", args...)
		cmdtest.ErrContains(t, err, "does not exist")
	}
	if cmdtest.Exists("test.db") {
		t.Error("status or down created the database")
	}
}

func TestMigrateWithoutDatabaseConfigured(t *testing.T) {
	cmdtest.Setup(t, "logging:\n  level: info\n")
	_, err := run(t, "", "migrate", "status")
	cmdtest.ErrContains(t, err, "no database file specified")
}