package main

import (
	"fmt"
	"os"
	"sort"

	"github.com/spf13/cobra"

	"git.warky.dev/wdevs/relspecgo/pkg/readers"
	"git.warky.dev/wdevs/relspecgo/pkg/readers/sqldir"
	"git.warky.dev/wdevs/relspecgo/pkg/writers"
	"git.warky.dev/wdevs/relspecgo/pkg/writers/sqlexec"
)

var (
	scriptsDir        string
	scriptsConn       string
	scriptsSchemaName string
	scriptsDBName     string
)

var scriptsCmd = &cobra.Command{
	Use:   "scripts",
	Short: "Manage and execute SQL migration scripts",
	Long: `Manage and execute SQL migration scripts from a directory.

Scripts must follow the naming pattern (both separators supported):
  {priority}_{sequence}_{name}.sql or .pgsql
  {priority}-{sequence}-{name}.sql or .pgsql

Example filenames (underscore format):
  1_001_create_users.sql       # Priority 1, Sequence 1
  1_002_create_posts.sql       # Priority 1, Sequence 2
  2_001_add_indexes.pgsql      # Priority 2, Sequence 1

Example filenames (hyphen format):
  1-001-create-users.sql       # Priority 1, Sequence 1
  1-002-create-posts.sql       # Priority 1, Sequence 2
  10-10-create-newid.pgsql     # Priority 10, Sequence 10

Both formats can be mixed in the same directory.
Scripts are executed in order: Priority (ascending), then Sequence (ascending).`,
}

var scriptsListCmd = &cobra.Command{
	Use:   "list",
	Short: "List SQL scripts from a directory",
	Long: `List SQL scripts from a directory and show their execution order.

The scripts are read from the specified directory and displayed in the order
they would be executed (Priority ascending, then Sequence ascending).

Example:
  relspec scripts list --dir ./migrations`,
	RunE: runScriptsList,
}

var scriptsExecuteCmd = &cobra.Command{
	Use:   "execute",
	Short: "Execute SQL scripts against a database",
	Long: `Execute SQL scripts from a directory against a PostgreSQL database.

Scripts are executed in order: Priority (ascending), then Sequence (ascending).
Execution stops immediately on the first error.

The directory is scanned recursively for files matching the patterns:
  {priority}_{sequence}_{name}.sql or .pgsql (underscore format)
  {priority}-{sequence}-{name}.sql or .pgsql (hyphen format)

PostgreSQL Connection String Examples:
  postgres://username:password@localhost:5432/database_name
  postgres://username:password@localhost/database_name
  postgresql://user:pass@host:5432/dbname?sslmode=disable
  postgresql://user:pass@host/dbname?sslmode=require

Examples:
  # Execute migration scripts
  relspec scripts execute --dir ./migrations \
                          --conn "postgres://user:pass@localhost:5432/mydb"

  # Execute with custom schema name
  relspec scripts execute --dir ./migrations \
                          --conn "postgres://localhost/mydb" \
                          --schema public

  # Execute with SSL disabled
  relspec scripts execute --dir ./sql \
                          --conn "postgres://user:pass@localhost/db?sslmode=disable"`,
	RunE: runScriptsExecute,
}

func init() {
	// List command flags
	scriptsListCmd.Flags().StringVar(&scriptsDir, "dir", "", "Directory containing SQL scripts (required)")
	scriptsListCmd.Flags().StringVar(&scriptsSchemaName, "schema", "public", "Schema name (optional, default: public)")
	scriptsListCmd.Flags().StringVar(&scriptsDBName, "database", "database", "Database name (optional, default: database)")
	err := scriptsListCmd.MarkFlagRequired("dir")
	if err != nil {
		fmt.Fprintf(os.Stderr, "Error marking dir flag as required: %v\n", err)
	}

	// Execute command flags
	scriptsExecuteCmd.Flags().StringVar(&scriptsDir, "dir", "", "Directory containing SQL scripts (required)")
	scriptsExecuteCmd.Flags().StringVar(&scriptsConn, "conn", "", "PostgreSQL connection string (required)")
	scriptsExecuteCmd.Flags().StringVar(&scriptsSchemaName, "schema", "public", "Schema name (optional, default: public)")
	scriptsExecuteCmd.Flags().StringVar(&scriptsDBName, "database", "database", "Database name (optional, default: database)")

	err = scriptsExecuteCmd.MarkFlagRequired("dir")
	if err != nil {
		fmt.Fprintf(os.Stderr, "Error marking dir flag as required: %v\n", err)
	}
	err = scriptsExecuteCmd.MarkFlagRequired("conn")
	if err != nil {
		fmt.Fprintf(os.Stderr, "Error marking conn flag as required: %v\n", err)
	}

	// Add subcommands to scripts command
	scriptsCmd.AddCommand(scriptsListCmd)
	scriptsCmd.AddCommand(scriptsExecuteCmd)
}

func runScriptsList(cmd *cobra.Command, args []string) error {
	fmt.Fprintf(os.Stderr, "\n=== SQL Scripts List ===\n")
	fmt.Fprintf(os.Stderr, "Directory: %s\n\n", scriptsDir)

	// Read scripts from directory
	reader := sqldir.NewReader(&readers.ReaderOptions{
		FilePath: scriptsDir,
		Metadata: map[string]any{
			"schema_name":   scriptsSchemaName,
			"database_name": scriptsDBName,
		},
	})

	db, err := reader.ReadDatabase()
	if err != nil {
		return fmt.Errorf("failed to read scripts: %w", err)
	}

	if len(db.Schemas) == 0 {
		fmt.Fprintf(os.Stderr, "No schemas found\n")
		return nil
	}

	schema := db.Schemas[0]
	if len(schema.Scripts) == 0 {
		fmt.Fprintf(os.Stderr, "No SQL scripts found matching pattern {priority}_{sequence}_{name}.sql\n")
		return nil
	}

	// Sort scripts by Priority then Sequence
	sortedScripts := make([]*struct {
		name     string
		priority int
		sequence uint
		sqlLines int
	}, len(schema.Scripts))

	for i, script := range schema.Scripts {
		// Count non-empty lines in SQL
		sqlLines := 0
		for _, line := range []byte(script.SQL) {
			if line == '\n' {
				sqlLines++
			}
		}
		if len(script.SQL) > 0 {
			sqlLines++ // Count last line if no trailing newline
		}

		sortedScripts[i] = &struct {
			name     string
			priority int
			sequence uint
			sqlLines int
		}{
			name:     script.Name,
			priority: script.Priority,
			sequence: script.Sequence,
			sqlLines: sqlLines,
		}
	}

	sort.Slice(sortedScripts, func(i, j int) bool {
		if sortedScripts[i].priority != sortedScripts[j].priority {
			return sortedScripts[i].priority < sortedScripts[j].priority
		}
		return sortedScripts[i].sequence < sortedScripts[j].sequence
	})

	fmt.Fprintf(os.Stderr, "Found %d script(s) in execution order:\n\n", len(sortedScripts))
	fmt.Fprintf(os.Stderr, "%-4s %-10s %-8s %-30s %s\n", "No.", "Priority", "Sequence", "Name", "Lines")
	fmt.Fprintf(os.Stderr, "%-4s %-10s %-8s %-30s %s\n", "----", "--------", "--------", "------------------------------", "-----")

	for i, script := range sortedScripts {
		fmt.Fprintf(os.Stderr, "%-4d %-10d %-8d %-30s %d\n",
			i+1,
			script.priority,
			script.sequence,
			script.name,
			script.sqlLines,
		)
	}

	fmt.Fprintf(os.Stderr, "\n")
	return nil
}

func runScriptsExecute(cmd *cobra.Command, args []string) error {
	fmt.Fprintf(os.Stderr, "\n=== SQL Scripts Execution ===\n")
	fmt.Fprintf(os.Stderr, "Started at: %s\n", getCurrentTimestamp())
	fmt.Fprintf(os.Stderr, "Directory: %s\n", scriptsDir)
	fmt.Fprintf(os.Stderr, "Database:  %s\n\n", maskPassword(scriptsConn))

	// Step 1: Read scripts from directory
	fmt.Fprintf(os.Stderr, "[1/2] Reading SQL scripts...\n")

	reader := sqldir.NewReader(&readers.ReaderOptions{
		FilePath: scriptsDir,
		Metadata: map[string]any{
			"schema_name":   scriptsSchemaName,
			"database_name": scriptsDBName,
		},
	})

	db, err := reader.ReadDatabase()
	if err != nil {
		return fmt.Errorf("failed to read scripts: %w", err)
	}

	if len(db.Schemas) == 0 {
		return fmt.Errorf("no schemas found")
	}

	schema := db.Schemas[0]
	if len(schema.Scripts) == 0 {
		fmt.Fprintf(os.Stderr, "      No scripts found. Nothing to execute.\n\n")
		return nil
	}

	fmt.Fprintf(os.Stderr, "      ✓ Found %d script(s)\n\n", len(schema.Scripts))

	// Step 2: Execute scripts
	fmt.Fprintf(os.Stderr, "[2/2] Executing scripts in order (Priority → Sequence)...\n\n")

	writer := sqlexec.NewWriter(&writers.WriterOptions{
		Metadata: map[string]any{
			"connection_string": scriptsConn,
		},
	})

	if err := writer.WriteSchema(schema); err != nil {
		fmt.Fprintf(os.Stderr, "\n")
		return fmt.Errorf("execution failed: %w", err)
	}

	fmt.Fprintf(os.Stderr, "\n=== Execution Complete ===\n")
	fmt.Fprintf(os.Stderr, "Completed at: %s\n", getCurrentTimestamp())
	fmt.Fprintf(os.Stderr, "Successfully executed %d script(s)\n\n", len(schema.Scripts))

	return nil
}