# All files / src/db schema.ts

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     /**
     * Database schema for Codewalk District.
     *
     * Defines the three-level task hierarchy:
     * - Initiative: Top-level project
     * - Phase: Major milestone within initiative
     * - Task: Individual work item (can have parentTaskId for decomposition relationships)
     *
     * Plus a task_dependencies table for task dependency relationships.
     */

    import { sqliteTable, text, integer, uniqueIndex, index } from 'drizzle-orm/sqlite-core';
    import { relations, type InferInsertModel, type InferSelectModel } from 'drizzle-orm';

    // ============================================================================
    // INITIATIVES
    // ============================================================================

    export const initiatives = sqliteTable('initiatives', {
      id: text('id').primaryKey(),
      name: text('name').notNull(),
      status: text('status', { enum: ['active', 'completed', 'archived'] })
        .notNull()
        .default('active'),
      mergeRequiresApproval: integer('merge_requires_approval', { mode: 'boolean' })
        .notNull()
        .default(true),
      branch: text('branch'), // Auto-generated initiative branch (e.g., 'cw/user-auth')
      executionMode: text('execution_mode', { enum: ['yolo', 'review_per_phase'] })
        .notNull()
        .default('review_per_phase'),
      createdAt: integer('created_at', { mode: 'timestamp' }).notNull(),
      updatedAt: integer('updated_at', { mode: 'timestamp' }).notNull(),
    });

    export const initiativesRelations = relations(initiatives, ({ many }) => ({
      phases: many(phases),
      pages: many(pages),
      initiativeProjects: many(initiativeProjects),
      tasks: many(tasks),
      changeSets: many(changeSets),
    }));

    export type Initiative = InferSelectModel<typeof initiatives>;
    export type NewInitiative = InferInsertModel<typeof initiatives>;

    // ============================================================================
    // PHASES
    // ============================================================================

    export const phases = sqliteTable('phases', {
      id: text('id').primaryKey(),
      initiativeId: text('initiative_id')
        .notNull()
        .references(() => initiatives.id, { onDelete: 'cascade' }),
      name: text('name').notNull(),
      content: text('content'),
      status: text('status', { enum: ['pending', 'approved', 'in_progress', 'completed', 'blocked', 'pending_review'] })
        .notNull()
        .default('pending'),
      createdAt: integer('created_at', { mode: 'timestamp' }).notNull(),
      updatedAt: integer('updated_at', { mode: 'timestamp' }).notNull(),
    });

    export const phasesRelations = relations(phases, ({ one, many }) => ({
      initiative: one(initiatives, {
        fields: [phases.initiativeId],
        references: [initiatives.id],
      }),
      tasks: many(tasks),
      // Dependencies: phases this phase depends on
      dependsOn: many(phaseDependencies, { relationName: 'dependentPhase' }),
      // Dependents: phases that depend on this phase
      dependents: many(phaseDependencies, { relationName: 'dependencyPhase' }),
    }));

    export type Phase = InferSelectModel<typeof phases>;
    export type NewPhase = InferInsertModel<typeof phases>;

    // ============================================================================
    // PHASE DEPENDENCIES
    // ============================================================================

    export const phaseDependencies = sqliteTable('phase_dependencies', {
      id: text('id').primaryKey(),
      phaseId: text('phase_id')
        .notNull()
        .references(() => phases.id, { onDelete: 'cascade' }),
      dependsOnPhaseId: text('depends_on_phase_id')
        .notNull()
        .references(() => phases.id, { onDelete: 'cascade' }),
      createdAt: integer('created_at', { mode: 'timestamp' }).notNull(),
    });

    export const phaseDependenciesRelations = relations(phaseDependencies, ({ one }) => ({
      phase: one(phases, {
        fields: [phaseDependencies.phaseId],
        references: [phases.id],
        relationName: 'dependentPhase',
      }),
      dependsOnPhase: one(phases, {
        fields: [phaseDependencies.dependsOnPhaseId],
        references: [phases.id],
        relationName: 'dependencyPhase',
      }),
    }));

    export type PhaseDependency = InferSelectModel<typeof phaseDependencies>;
    export type NewPhaseDependency = InferInsertModel<typeof phaseDependencies>;

    // ============================================================================
    // TASKS
    // ============================================================================

    /**
     * Task category enum values.
     * Defines what kind of work a task represents.
     */
    export const TASK_CATEGORIES = [
      'execute',    // Standard execution task
      'research',   // Research/exploration task
      'discuss',    // Discussion/context gathering
      'plan',       // Plan initiative into phases
      'detail',     // Detail phase into tasks
      'refine',     // Refine/edit content
      'verify',     // Verification task
      'merge',      // Merge task
      'review',     // Review/approval task
    ] as const;

    export type TaskCategory = (typeof TASK_CATEGORIES)[number];

    export const tasks = sqliteTable('tasks', {
      id: text('id').primaryKey(),
      // Parent context - at least one should be set
      phaseId: text('phase_id').references(() => phases.id, { onDelete: 'cascade' }),
      initiativeId: text('initiative_id').references(() => initiatives.id, { onDelete: 'cascade' }),
      // Parent task for detail hierarchy (child tasks link to parent detail task)
      parentTaskId: text('parent_task_id').references((): ReturnType<typeof text> => tasks.id, { onDelete: 'cascade' }),
      name: text('name').notNull(),
      description: text('description'),
      type: text('type', {
        enum: ['auto', 'checkpoint:human-verify', 'checkpoint:decision', 'checkpoint:human-action'],
      })
        .notNull()
        .default('auto'),
      category: text('category', {
        enum: TASK_CATEGORIES,
      })
        .notNull()
        .default('execute'),
      priority: text('priority', { enum: ['low', 'medium', 'high'] })
        .notNull()
        .default('medium'),
      status: text('status', {
        enum: ['pending_approval', 'pending', 'in_progress', 'completed', 'blocked'],
      })
        .notNull()
        .default('pending'),
      requiresApproval: integer('requires_approval', { mode: 'boolean' }), // null = inherit from initiative
      order: integer('order').notNull().default(0),
      createdAt: integer('created_at', { mode: 'timestamp' }).notNull(),
      updatedAt: integer('updated_at', { mode: 'timestamp' }).notNull(),
    });

    export const tasksRelations = relations(tasks, ({ one, many }) => ({
      phase: one(phases, {
        fields: [tasks.phaseId],
        references: [phases.id],
      }),
      initiative: one(initiatives, {
        fields: [tasks.initiativeId],
        references: [initiatives.id],
      }),
      // Parent task (for detail hierarchy - child links to parent detail task)
      parentTask: one(tasks, {
        fields: [tasks.parentTaskId],
        references: [tasks.id],
        relationName: 'parentTask',
      }),
      // Child tasks (tasks created from decomposition of this task)
      childTasks: many(tasks, { relationName: 'parentTask' }),
      // Dependencies: tasks this task depends on
      dependsOn: many(taskDependencies, { relationName: 'dependentTask' }),
      // Dependents: tasks that depend on this task
      dependents: many(taskDependencies, { relationName: 'dependencyTask' }),
    }));

    export type Task = InferSelectModel<typeof tasks>;
    export type NewTask = InferInsertModel<typeof tasks>;

    // ============================================================================
    // TASK DEPENDENCIES
    // ============================================================================

    export const taskDependencies = sqliteTable('task_dependencies', {
      id: text('id').primaryKey(),
      taskId: text('task_id')
        .notNull()
        .references(() => tasks.id, { onDelete: 'cascade' }),
      dependsOnTaskId: text('depends_on_task_id')
        .notNull()
        .references(() => tasks.id, { onDelete: 'cascade' }),
      createdAt: integer('created_at', { mode: 'timestamp' }).notNull(),
    });

    export const taskDependenciesRelations = relations(taskDependencies, ({ one }) => ({
      task: one(tasks, {
        fields: [taskDependencies.taskId],
        references: [tasks.id],
        relationName: 'dependentTask',
      }),
      dependsOnTask: one(tasks, {
        fields: [taskDependencies.dependsOnTaskId],
        references: [tasks.id],
        relationName: 'dependencyTask',
      }),
    }));

    export type TaskDependency = InferSelectModel<typeof taskDependencies>;
    export type NewTaskDependency = InferInsertModel<typeof taskDependencies>;

    // ============================================================================
    // ACCOUNTS
    // ============================================================================

    export const accounts = sqliteTable('accounts', {
      id: text('id').primaryKey(),
      email: text('email').notNull(),
      provider: text('provider').notNull().default('claude'),
      configJson: text('config_json'),    // .claude.json content (JSON string)
      credentials: text('credentials'),    // .credentials.json content (JSON string)
      isExhausted: integer('is_exhausted', { mode: 'boolean' }).notNull().default(false),
      exhaustedUntil: integer('exhausted_until', { mode: 'timestamp' }),
      lastUsedAt: integer('last_used_at', { mode: 'timestamp' }),
      sortOrder: integer('sort_order').notNull().default(0),
      createdAt: integer('created_at', { mode: 'timestamp' }).notNull(),
      updatedAt: integer('updated_at', { mode: 'timestamp' }).notNull(),
    });

    export const accountsRelations = relations(accounts, ({ many }) => ({
      agents: many(agents),
    }));

    export type Account = InferSelectModel<typeof accounts>;
    export type NewAccount = InferInsertModel<typeof accounts>;

    // ============================================================================
    // AGENTS
    // ============================================================================

    export const agents = sqliteTable('agents', {
      id: text('id').primaryKey(),
      name: text('name').notNull().unique(), // Human-readable alias (e.g., 'jolly-penguin')
      taskId: text('task_id').references(() => tasks.id, { onDelete: 'set null' }), // Task may be deleted
      initiativeId: text('initiative_id').references(() => initiatives.id, { onDelete: 'set null' }),
      sessionId: text('session_id'), // Claude CLI session ID for resumption (null until first run completes)
      worktreeId: text('worktree_id').notNull(), // Agent alias (deterministic path: agent-workdirs/<alias>/)
      provider: text('provider').notNull().default('claude'),
      accountId: text('account_id').references(() => accounts.id, { onDelete: 'set null' }),
      status: text('status', {
        enum: ['idle', 'running', 'waiting_for_input', 'stopped', 'crashed'],
      })
        .notNull()
        .default('idle'),
      mode: text('mode', { enum: ['execute', 'discuss', 'plan', 'detail', 'refine'] })
        .notNull()
        .default('execute'),
      pid: integer('pid'),
      exitCode: integer('exit_code'), // Process exit code for debugging crashes
      outputFilePath: text('output_file_path'),
      result: text('result'),
      pendingQuestions: text('pending_questions'),
      createdAt: integer('created_at', { mode: 'timestamp' }).notNull(),
      updatedAt: integer('updated_at', { mode: 'timestamp' }).notNull(),
      userDismissedAt: integer('user_dismissed_at', { mode: 'timestamp' }),
    });

    export const agentsRelations = relations(agents, ({ one, many }) => ({
      task: one(tasks, {
        fields: [agents.taskId],
        references: [tasks.id],
      }),
      initiative: one(initiatives, {
        fields: [agents.initiativeId],
        references: [initiatives.id],
      }),
      account: one(accounts, {
        fields: [agents.accountId],
        references: [accounts.id],
      }),
      changeSets: many(changeSets),
    }));

    export type Agent = InferSelectModel<typeof agents>;
    export type NewAgent = InferInsertModel<typeof agents>;

    // ============================================================================
    // CHANGE SETS
    // ============================================================================

    export const changeSets = sqliteTable('change_sets', {
      id: text('id').primaryKey(),
      agentId: text('agent_id')
        .references(() => agents.id, { onDelete: 'set null' }),
      agentName: text('agent_name').notNull(),
      initiativeId: text('initiative_id')
        .notNull()
        .references(() => initiatives.id, { onDelete: 'cascade' }),
      mode: text('mode', { enum: ['plan', 'detail', 'refine'] }).notNull(),
      summary: text('summary'),
      status: text('status', { enum: ['applied', 'reverted'] })
        .notNull()
        .default('applied'),
      revertedAt: integer('reverted_at', { mode: 'timestamp' }),
      createdAt: integer('created_at', { mode: 'timestamp' }).notNull(),
    }, (table) => [
      index('change_sets_initiative_id_idx').on(table.initiativeId),
    ]);

    export const changeSetsRelations = relations(changeSets, ({ one, many }) => ({
      agent: one(agents, {
        fields: [changeSets.agentId],
        references: [agents.id],
      }),
      initiative: one(initiatives, {
        fields: [changeSets.initiativeId],
        references: [initiatives.id],
      }),
      entries: many(changeSetEntries),
    }));

    export type ChangeSet = InferSelectModel<typeof changeSets>;
    export type NewChangeSet = InferInsertModel<typeof changeSets>;

    export const changeSetEntries = sqliteTable('change_set_entries', {
      id: text('id').primaryKey(),
      changeSetId: text('change_set_id')
        .notNull()
        .references(() => changeSets.id, { onDelete: 'cascade' }),
      entityType: text('entity_type', { enum: ['page', 'phase', 'task', 'phase_dependency'] }).notNull(),
      entityId: text('entity_id').notNull(),
      action: text('action', { enum: ['create', 'update', 'delete'] }).notNull(),
      previousState: text('previous_state'), // JSON snapshot, null for creates
      newState: text('new_state'), // JSON snapshot, null for deletes
      sortOrder: integer('sort_order').notNull().default(0),
      createdAt: integer('created_at', { mode: 'timestamp' }).notNull(),
    }, (table) => [
      index('change_set_entries_change_set_id_idx').on(table.changeSetId),
    ]);

    export const changeSetEntriesRelations = relations(changeSetEntries, ({ one }) => ({
      changeSet: one(changeSets, {
        fields: [changeSetEntries.changeSetId],
        references: [changeSets.id],
      }),
    }));

    export type ChangeSetEntry = InferSelectModel<typeof changeSetEntries>;
    export type NewChangeSetEntry = InferInsertModel<typeof changeSetEntries>;

    // ============================================================================
    // MESSAGES
    // ============================================================================

    export const messages = sqliteTable('messages', {
      id: text('id').primaryKey(),
      senderType: text('sender_type', { enum: ['agent', 'user'] }).notNull(),
      senderId: text('sender_id').references(() => agents.id, { onDelete: 'set null' }), // Agent ID if senderType='agent', null for user
      recipientType: text('recipient_type', { enum: ['agent', 'user'] }).notNull(),
      recipientId: text('recipient_id').references(() => agents.id, { onDelete: 'set null' }), // Agent ID if recipientType='agent', null for user
      type: text('type', { enum: ['question', 'info', 'error', 'response'] })
        .notNull()
        .default('info'),
      content: text('content').notNull(),
      requiresResponse: integer('requires_response', { mode: 'boolean' })
        .notNull()
        .default(false),
      status: text('status', { enum: ['pending', 'read', 'responded'] })
        .notNull()
        .default('pending'),
      parentMessageId: text('parent_message_id').references((): ReturnType<typeof text> => messages.id, { onDelete: 'set null' }), // Links response to original question
      createdAt: integer('created_at', { mode: 'timestamp' }).notNull(),
      updatedAt: integer('updated_at', { mode: 'timestamp' }).notNull(),
    });

    export const messagesRelations = relations(messages, ({ one, many }) => ({
      // Sender agent (optional - null for user senders)
      senderAgent: one(agents, {
        fields: [messages.senderId],
        references: [agents.id],
        relationName: 'senderAgent',
      }),
      // Recipient agent (optional - null for user recipients)
      recipientAgent: one(agents, {
        fields: [messages.recipientId],
        references: [agents.id],
        relationName: 'recipientAgent',
      }),
      // Parent message (for threading responses)
      parentMessage: one(messages, {
        fields: [messages.parentMessageId],
        references: [messages.id],
        relationName: 'parentMessage',
      }),
      // Child messages (replies to this message)
      childMessages: many(messages, { relationName: 'parentMessage' }),
    }));

    export type Message = InferSelectModel<typeof messages>;
    export type NewMessage = InferInsertModel<typeof messages>;

    // ============================================================================
    // PAGES
    // ============================================================================

    export const pages = sqliteTable('pages', {
      id: text('id').primaryKey(),
      initiativeId: text('initiative_id')
        .notNull()
        .references(() => initiatives.id, { onDelete: 'cascade' }),
      parentPageId: text('parent_page_id').references((): ReturnType<typeof text> => pages.id, { onDelete: 'cascade' }),
      title: text('title').notNull(),
      content: text('content'), // JSON string from Tiptap
      sortOrder: integer('sort_order').notNull().default(0),
      createdAt: integer('created_at', { mode: 'timestamp' }).notNull(),
      updatedAt: integer('updated_at', { mode: 'timestamp' }).notNull(),
    });

    export const pagesRelations = relations(pages, ({ one, many }) => ({
      initiative: one(initiatives, {
        fields: [pages.initiativeId],
        references: [initiatives.id],
      }),
      parentPage: one(pages, {
        fields: [pages.parentPageId],
        references: [pages.id],
        relationName: 'parentPage',
      }),
      childPages: many(pages, { relationName: 'parentPage' }),
    }));

    export type Page = InferSelectModel<typeof pages>;
    export type NewPage = InferInsertModel<typeof pages>;

    // ============================================================================
    // PROJECTS
    // ============================================================================

    export const projects = sqliteTable('projects', {
      id: text('id').primaryKey(),
      name: text('name').notNull().unique(),
      url: text('url').notNull().unique(),
      defaultBranch: text('default_branch').notNull().default('main'),
      createdAt: integer('created_at', { mode: 'timestamp' }).notNull(),
      updatedAt: integer('updated_at', { mode: 'timestamp' }).notNull(),
    });

    export const projectsRelations = relations(projects, ({ many }) => ({
      initiativeProjects: many(initiativeProjects),
    }));

    export type Project = InferSelectModel<typeof projects>;
    export type NewProject = InferInsertModel<typeof projects>;

    // ============================================================================
    // INITIATIVE PROJECTS (junction)
    // ============================================================================

    export const initiativeProjects = sqliteTable('initiative_projects', {
      id: text('id').primaryKey(),
      initiativeId: text('initiative_id')
        .notNull()
        .references(() => initiatives.id, { onDelete: 'cascade' }),
      projectId: text('project_id')
        .notNull()
        .references(() => projects.id, { onDelete: 'cascade' }),
      createdAt: integer('created_at', { mode: 'timestamp' }).notNull(),
    }, (table) => [
      uniqueIndex('initiative_project_unique').on(table.initiativeId, table.projectId),
    ]);

    export const initiativeProjectsRelations = relations(initiativeProjects, ({ one }) => ({
      initiative: one(initiatives, {
        fields: [initiativeProjects.initiativeId],
        references: [initiatives.id],
      }),
      project: one(projects, {
        fields: [initiativeProjects.projectId],
        references: [projects.id],
      }),
    }));

    export type InitiativeProject = InferSelectModel<typeof initiativeProjects>;
    export type NewInitiativeProject = InferInsertModel<typeof initiativeProjects>;

    // ============================================================================
    // AGENT LOG CHUNKS
    // ============================================================================

    export const agentLogChunks = sqliteTable('agent_log_chunks', {
      id: text('id').primaryKey(),
      agentId: text('agent_id').notNull(),            // NO FK — survives agent deletion
      agentName: text('agent_name').notNull(),         // Snapshot for display after deletion
      sessionNumber: integer('session_number').notNull().default(1),
      content: text('content').notNull(),              // Raw JSONL chunk from file
      createdAt: integer('created_at', { mode: 'timestamp' }).notNull(),
    }, (table) => [
      index('agent_log_chunks_agent_id_idx').on(table.agentId),
    ]);

    export type AgentLogChunk = InferSelectModel<typeof agentLogChunks>;
    export type NewAgentLogChunk = InferInsertModel<typeof agentLogChunks>;

    // ============================================================================
    // CONVERSATIONS (inter-agent communication)
    // ============================================================================

    export const conversations = sqliteTable('conversations', {
      id: text('id').primaryKey(),
      fromAgentId: text('from_agent_id').notNull().references(() => agents.id, { onDelete: 'cascade' }),
      toAgentId: text('to_agent_id').notNull().references(() => agents.id, { onDelete: 'cascade' }),
      initiativeId: text('initiative_id').references(() => initiatives.id, { onDelete: 'set null' }),
      phaseId: text('phase_id').references(() => phases.id, { onDelete: 'set null' }),
      taskId: text('task_id').references(() => tasks.id, { onDelete: 'set null' }),
      question: text('question').notNull(),
      answer: text('answer'),
      status: text('status', { enum: ['pending', 'answered'] }).notNull().default('pending'),
      createdAt: integer('created_at', { mode: 'timestamp' }).notNull(),
      updatedAt: integer('updated_at', { mode: 'timestamp' }).notNull(),
    }, (table) => [
      index('conversations_to_agent_status_idx').on(table.toAgentId, table.status),
      index('conversations_from_agent_idx').on(table.fromAgentId),
    ]);

    export type Conversation = InferSelectModel<typeof conversations>;
    export type NewConversation = InferInsertModel<typeof conversations>;