-- AP1.4: Roadmap + RoadmapItem + Dependencies (methodenneutral)

CREATE TABLE roadmaps (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    tenant_id UUID NOT NULL REFERENCES tenants(id) ON DELETE CASCADE,
    initiative_id UUID NOT NULL REFERENCES initiatives(id) ON DELETE CASCADE,
    title VARCHAR(255) NOT NULL DEFAULT 'Plan',
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    UNIQUE (tenant_id, initiative_id)
);

CREATE INDEX idx_roadmaps_tenant_initiative ON roadmaps(tenant_id, initiative_id);

CREATE TABLE roadmap_items (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    tenant_id UUID NOT NULL REFERENCES tenants(id) ON DELETE CASCADE,
    roadmap_id UUID NOT NULL REFERENCES roadmaps(id) ON DELETE CASCADE,
    item_type VARCHAR(32) NOT NULL DEFAULT 'milestone'
        CHECK (item_type IN ('milestone', 'review_gate', 'maturity_stage')),
    title VARCHAR(255) NOT NULL,
    goal_description TEXT NOT NULL DEFAULT '',
    definition_of_done JSONB NOT NULL DEFAULT '[]'::jsonb,
    status VARCHAR(32) NOT NULL DEFAULT 'planned'
        CHECK (status IN ('planned', 'active', 'at_risk', 'reached', 'moved', 'discarded')),
    sequencing_mode VARCHAR(32) NOT NULL DEFAULT 'sequential'
        CHECK (sequencing_mode IN ('sequential', 'parallel', 'optional')),
    target_date DATE NULL,
    sort_order INT NOT NULL DEFAULT 0,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX idx_roadmap_items_tenant_roadmap ON roadmap_items(tenant_id, roadmap_id);
CREATE INDEX idx_roadmap_items_tenant_status ON roadmap_items(tenant_id, status);
CREATE INDEX idx_roadmap_items_tenant_type ON roadmap_items(tenant_id, item_type);

CREATE TABLE roadmap_item_dependencies (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    tenant_id UUID NOT NULL REFERENCES tenants(id) ON DELETE CASCADE,
    from_item_id UUID NOT NULL REFERENCES roadmap_items(id) ON DELETE CASCADE,
    to_item_id UUID NOT NULL REFERENCES roadmap_items(id) ON DELETE CASCADE,
    dependency_type VARCHAR(32) NOT NULL DEFAULT 'requires'
        CHECK (dependency_type IN ('requires', 'blocks', 'related')),
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    UNIQUE (tenant_id, from_item_id, to_item_id, dependency_type)
);

CREATE INDEX idx_roadmap_deps_from ON roadmap_item_dependencies(tenant_id, from_item_id);
CREATE INDEX idx_roadmap_deps_to ON roadmap_item_dependencies(tenant_id, to_item_id);

ALTER TABLE backlog_items
    ADD COLUMN roadmap_item_id UUID NULL REFERENCES roadmap_items(id) ON DELETE SET NULL;

ALTER TABLE actions
    ADD COLUMN roadmap_item_id UUID NULL REFERENCES roadmap_items(id) ON DELETE SET NULL;

CREATE INDEX idx_backlog_roadmap_item ON backlog_items(tenant_id, roadmap_item_id)
    WHERE roadmap_item_id IS NOT NULL;
CREATE INDEX idx_actions_roadmap_item ON actions(tenant_id, roadmap_item_id)
    WHERE roadmap_item_id IS NOT NULL;

-- Ein Plan pro Initiative
INSERT INTO roadmaps (tenant_id, initiative_id, title)
SELECT tenant_id, id, 'Plan' FROM initiatives;

-- Bestehende Meilensteine → RoadmapItems (IDs beibehalten für Evidence/Review-FKs)
INSERT INTO roadmap_items (
    id, tenant_id, roadmap_id, item_type, title, goal_description, status,
    sequencing_mode, target_date, sort_order, created_at, updated_at
)
SELECT
    m.id,
    m.tenant_id,
    r.id,
    'milestone',
    m.title,
    m.goal_description,
    m.status,
    'sequential',
    m.target_date,
    0,
    m.created_at,
    m.updated_at
FROM milestones m
JOIN roadmaps r ON r.initiative_id = m.initiative_id AND r.tenant_id = m.tenant_id;