package diff

import "git.warky.dev/wdevs/relspecgo/pkg/models"

// DiffResult represents the complete difference analysis between two databases
type DiffResult struct {
	Source  string      `json:"source"`
	Target  string      `json:"target"`
	Schemas *SchemaDiff `json:"schemas"`
}

// SchemaDiff represents differences at the schema level
type SchemaDiff struct {
	Missing  []*models.Schema `json:"missing"`  // Schemas in source but not in target
	Extra    []*models.Schema `json:"extra"`    // Schemas in target but not in source
	Modified []*SchemaChange  `json:"modified"` // Schemas that exist in both but differ
}

// SchemaChange represents changes within a schema
type SchemaChange struct {
	Name      string        `json:"name"`
	Tables    *TableDiff    `json:"tables,omitempty"`
	Views     *ViewDiff     `json:"views,omitempty"`
	Sequences *SequenceDiff `json:"sequences,omitempty"`
}

// TableDiff represents differences in tables
type TableDiff struct {
	Missing  []*models.Table `json:"missing"`  // Tables in source but not in target
	Extra    []*models.Table `json:"extra"`    // Tables in target but not in source
	Modified []*TableChange  `json:"modified"` // Tables that exist in both but differ
}

// TableChange represents changes within a table
type TableChange struct {
	Name          string            `json:"name"`
	Schema        string            `json:"schema"`
	Columns       *ColumnDiff       `json:"columns,omitempty"`
	Indexes       *IndexDiff        `json:"indexes,omitempty"`
	Constraints   *ConstraintDiff   `json:"constraints,omitempty"`
	Relationships *RelationshipDiff `json:"relationships,omitempty"`
}

// ColumnDiff represents differences in columns
type ColumnDiff struct {
	Missing  []*models.Column `json:"missing"`  // Columns in source but not in target
	Extra    []*models.Column `json:"extra"`    // Columns in target but not in source
	Modified []*ColumnChange  `json:"modified"` // Columns that exist in both but differ
}

// ColumnChange represents a modified column
type ColumnChange struct {
	Name    string         `json:"name"`
	Source  *models.Column `json:"source"`
	Target  *models.Column `json:"target"`
	Changes map[string]any `json:"changes"` // Map of field name to what changed
}

// IndexDiff represents differences in indexes
type IndexDiff struct {
	Missing  []*models.Index `json:"missing"`  // Indexes in source but not in target
	Extra    []*models.Index `json:"extra"`    // Indexes in target but not in source
	Modified []*IndexChange  `json:"modified"` // Indexes that exist in both but differ
}

// IndexChange represents a modified index
type IndexChange struct {
	Name    string         `json:"name"`
	Source  *models.Index  `json:"source"`
	Target  *models.Index  `json:"target"`
	Changes map[string]any `json:"changes"`
}

// ConstraintDiff represents differences in constraints
type ConstraintDiff struct {
	Missing  []*models.Constraint `json:"missing"`  // Constraints in source but not in target
	Extra    []*models.Constraint `json:"extra"`    // Constraints in target but not in source
	Modified []*ConstraintChange  `json:"modified"` // Constraints that exist in both but differ
}

// ConstraintChange represents a modified constraint
type ConstraintChange struct {
	Name    string             `json:"name"`
	Source  *models.Constraint `json:"source"`
	Target  *models.Constraint `json:"target"`
	Changes map[string]any     `json:"changes"`
}

// RelationshipDiff represents differences in relationships
type RelationshipDiff struct {
	Missing  []*models.Relationship `json:"missing"`  // Relationships in source but not in target
	Extra    []*models.Relationship `json:"extra"`    // Relationships in target but not in source
	Modified []*RelationshipChange  `json:"modified"` // Relationships that exist in both but differ
}

// RelationshipChange represents a modified relationship
type RelationshipChange struct {
	Name    string               `json:"name"`
	Source  *models.Relationship `json:"source"`
	Target  *models.Relationship `json:"target"`
	Changes map[string]any       `json:"changes"`
}

// ViewDiff represents differences in views
type ViewDiff struct {
	Missing  []*models.View `json:"missing"`  // Views in source but not in target
	Extra    []*models.View `json:"extra"`    // Views in target but not in source
	Modified []*ViewChange  `json:"modified"` // Views that exist in both but differ
}

// ViewChange represents a modified view
type ViewChange struct {
	Name    string         `json:"name"`
	Source  *models.View   `json:"source"`
	Target  *models.View   `json:"target"`
	Changes map[string]any `json:"changes"`
}

// SequenceDiff represents differences in sequences
type SequenceDiff struct {
	Missing  []*models.Sequence `json:"missing"`  // Sequences in source but not in target
	Extra    []*models.Sequence `json:"extra"`    // Sequences in target but not in source
	Modified []*SequenceChange  `json:"modified"` // Sequences that exist in both but differ
}

// SequenceChange represents a modified sequence
type SequenceChange struct {
	Name    string           `json:"name"`
	Source  *models.Sequence `json:"source"`
	Target  *models.Sequence `json:"target"`
	Changes map[string]any   `json:"changes"`
}

// Summary provides counts for quick overview
type Summary struct {
	Schemas       SchemaSummary       `json:"schemas"`
	Tables        TableSummary        `json:"tables"`
	Columns       ColumnSummary       `json:"columns"`
	Indexes       IndexSummary        `json:"indexes"`
	Constraints   ConstraintSummary   `json:"constraints"`
	Relationships RelationshipSummary `json:"relationships"`
	Views         ViewSummary         `json:"views"`
	Sequences     SequenceSummary     `json:"sequences"`
}

type SchemaSummary struct {
	Missing  int `json:"missing"`
	Extra    int `json:"extra"`
	Modified int `json:"modified"`
}

type TableSummary struct {
	Missing  int `json:"missing"`
	Extra    int `json:"extra"`
	Modified int `json:"modified"`
}

type ColumnSummary struct {
	Missing  int `json:"missing"`
	Extra    int `json:"extra"`
	Modified int `json:"modified"`
}

type IndexSummary struct {
	Missing  int `json:"missing"`
	Extra    int `json:"extra"`
	Modified int `json:"modified"`
}

type ConstraintSummary struct {
	Missing  int `json:"missing"`
	Extra    int `json:"extra"`
	Modified int `json:"modified"`
}

type RelationshipSummary struct {
	Missing  int `json:"missing"`
	Extra    int `json:"extra"`
	Modified int `json:"modified"`
}

type ViewSummary struct {
	Missing  int `json:"missing"`
	Extra    int `json:"extra"`
	Modified int `json:"modified"`
}

type SequenceSummary struct {
	Missing  int `json:"missing"`
	Extra    int `json:"extra"`
	Modified int `json:"modified"`
}